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Attachment system for transmural attachment at the gastroesophageal junction
The present invention provides devices and methods for attachment of an endoluminal gastrointestinal device, such as an artificial stoma device, a gastrointestinal bypass sleeve device or an attachment cuff, within a patient's digestive tract for treatment of obesity.
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This patent application is a continuation of U.S. patent application Ser. No. 11/124,634 filed May 5, 2005 which claims the benefit of U.S. provisional patent application 60/569,442, filed on May 7, 2004, by Kagan et al. for Devices and Methods for Treating Morbid Obesity and U.S. provisional patent application 60/613,917, filed on Sep. 27, 2004, by Kagan et al. for Devices and Methods for Attachment of a Gastrointestinal Sleeve. This patent application is also a continuation-in-part of U.S. patent application Ser. No. 10/698,148, filed on Oct. 31, 2003 by Kagan et al. for Apparatus and Methods for Treatment of Morbid Obesity which claims priority to U.S. provisional patent applications 60/480,485 filed Jun. 21, 2003, 60/448,817 filed Feb. 21, 2003, 60/437,513 filed Dec. 30, 2002, 60/430,857 filed Dec. 3, 2002, 60/428,483 filed Nov. 22, 2002, and 60/422,987 filed Nov. 1, 2002. This patent application is also a continuation-in-part of U.S. patent application Ser. No. 10/998,424, filed on Nov. 29, 2004 by Kagan et al. for Apparatus and Methods for Treatment of Morbid Obesity and of U.S. patent application Ser. No. 11/025,364, filed on Dec. 29, 2004, by Kagan et al. for Devices and Methods for Treating Morbid Obesity. The devices and methods described herein can be combined with and/or used in conjunction with the apparatus and methods described in these prior applications. These and all patents and patent applications referred to herein are hereby expressly incorporated by reference in their entireties herein.
1. Field of the Invention
The present invention relates generally to apparatus and methods for treatment of obesity, and particularly morbid obesity. In particular, the present invention relates to devices and methods for attachment of a gastrointestinal sleeve device within a patient's digestive tract for treatment of obesity.
2. Description of the Related Art
Gastrointestinal sleeve devices for treatment of obesity have been described in the prior applications listed above, as have various devices and methods for attachment of a gastrointestinal sleeve device within a patient's digestive tract. The present invention is the result of continued investigation into devices and methods for attachment of a gastrointestinal sleeve device within a patient's digestive tract.
There is provided in accordance with one aspect of the present invention, an attachment system for attaching a device to the mucosal side of a wall of the gastrointestinal tract. The wall comprises, among other tissue layers, a muscularis layer and a serosal layer. The system comprises a gastrointestinal attachment cuff having a tubular body, a proximal end and a distal end. At least one attachment structure (sometimes referred to as a tissue anchor) is provided for transmural attachment of the cuff to the mucosal side. The anchor comprises a connecting element (sometimes referred to as a tension element) for extending through the wall and at least one transverse retention surface for positioning in contact with the serosal tissue. The cuff may be a unitary annular component or assembly, or may comprise two or three or more components spaced circumferentially apart about a longitudinal axis.
The tension element may comprise a suture. The tension element comprises a proximal end for extending through the mucosal layer and a distal end for carrying the transverse retention surface. The transverse retention surface comprises a proximal surface of a serosal anchor. The serosal anchor may comprise a T-tag, a disk, or an inflatable structure. The serosal anchor is transformable between a first, reduced profile for distal transmural advancement through the wall, and a second, enlarged profile for resisting proximal retraction through the wall.
The tension element has a length between the cuff and the transverse retention surface, and the length is generally at least about 2 mm and often no more than about 20 mm. In some implementations of the invention, the length is within the range from about 2 mm to about 10 mm and, depending on the patient, potentially within the range from about 3 mm to about 6 mm. Preferably, the connecting element is at least as long as the uncompressed wall thickness of the tissue at the attachment point.
The attachment system may additionally comprise a first engagement surface carried by a first coupler on the attachment cuff for coupling to a second, complementary engagement surface carried by a second coupler on a gastric bypass tube. The first and second couplers may be configured for removable coupling or permanent coupling between the bypass tube and the cuff. The bypass tube may have a length of at least about 50 cm, at least about 75 cm and in certain embodiments at least about 100 cm. The system may comprise at least 6 tissue anchors, and, in some applications, at least 12 tissue anchors.
The cuff may be omitted and the proximal end of the bypass tube may be attached directly to the adjacent tissue. The use of a cuff may be preferred, however, if removal or replacement of the bypass tube is contemplated, or if it is desirable to separate the steps of tissue attachment and bypass tube placement.
There is provided in accordance with another aspect of the present invention, a method of attaching a device to the mucosal side of a wall of the gastrointestinal tract, the wall comprising a muscularis layer and a serosal layer. The method comprises the steps of providing a tension element, having a retention element thereon. The retention element is advanced through the wall from the mucosal side and the retention element is placed such that it is spaced apart from the muscularis by serosal tissue. Changes are caused to the serosal tissue in between the retention element and the muscularis. The device is attached to the tension element, such that the device is positioned adjacent the mucosal surface. As used herein, mucosal surface is a term of directional orientation and refers to the tissue surface facing the interior of the body lumen such as the lower esophagus or stomach, which may be covered by an endothelial layer.
The changes may be caused to the serosal tissue following the attaching step. The changes may be caused to the serosal tissue prior to the attaching step. The changes may be caused to the serosal tissue in response to tension on the tension element, biasing the retention element against the serosal surface. Alternatively, the changes may be caused to the serosal tissue in response to the application of an active agent. The active agent may comprise a growth factor, a sclerosing agent, or other agent or process for increasing the tissue density (e.g. initiating a fibrotic response) of the serosal tissue residing between the retention element and the muscularis.
In accordance with a further aspect of the present invention, there is provided a method of treating a patient. The method comprises the steps of providing a gastrointestinal attachment cuff having a tubular body, a proximal end and a distal end. The gastrointestinal cuff is positioned in the patient's digestive tract adjacent a mucosal surface in the vicinity of the gastroesophageal junction, the mucosal surface separated from a serosal surface by a wall thickness. The gastroesophageal cuff is secured adjacent the mucosal surface by advancing at least three tissue anchors through the mucosal surface, across the wall thickness and through the serosal surface to position a transverse retention surface of each tissue anchor in contact with the serosal surface. Preferably, the foregoing steps are accomplished endoscopically.
The securing step may comprise advancing at least 6 tissue anchors through the mucosal surface, and, in certain applications, at least 12 tissue anchors.
The tissue anchor comprises a tension element such as a suture for connecting the transverse retention surface to the cuff. The transverse retention surface may be a surface on a T-tag, a disk, or other retention structure. The length of the tension element may be at least about 75% of the wall thickness between the mucosal surface and the serosal surface. Preferably, the length of the tension element is at least about 95% of the wall thickness, and, optimally, the length of the tension element is greater than the wall thickness. In one embodiment the length of the tension element is at least about 120% of the wall thickness.
The method may additionally comprise the step of providing an elongate flexible gastric bypass tube having a proximal end and a distal end, and attaching the proximal end to the cuff. The proximal end of the bypass tube may be attached to the cuff endoscopically. The attaching the proximal end of the bypass tube to the cuff step may comprise removably attaching the proximal end of the bypass tube to the cuff. The distal end of the bypass tube may be positioned in the patient's jejunum, or in the patient's ileum.
Further features and advantages of the present invention will become apparent to those of skill in the art in view of the detailed description of preferred embodiments which follows, when considered together with the attached drawings and claims.
FIGS. 57A and 58A-58C show an example of vertically mounted isolated sliding attachment members in a patient's stomach.
U.S. patent application Ser. No. 10/698,148, previously incorporated by reference, describes gastrointestinal sleeve devices that can mimic a Roux-en-Y gastric bypass by effectively reducing stomach volume, bypassing a portion of the stomach and/or small intestines, reducing nutrient absorption in the stomach and/or small intestines and depositing minimally or undigested food farther than normal into the intestines, thereby stimulating intestinal responses. The gastrointestinal sleeve devices described therein are all adaptable for use with the apparatus and methods of the present invention.
In conjunction with the stoma and/or gastric sleeve, the volume of the stomach can be reduced by suturing, stapling using open, transesophageal or laparoscopic techniques. Alternatively or in addition, a gastric balloon or other volume displacement device may be used in conjunction with the gastric sleeve to provide a feeling of satiety. These adjunctive techniques may have the effect of further reducing nutrient intake (in the case of a stomach reduction and pouch formation upstream of a stoma) and enhancing the effect of peristaltic motions of the stomach for moving food through the gastric sleeve intake (in the case of a stomach reduction downstream of a stoma where there is a gastric sleeve).
In each of these examples, the gastrointestinal sleeve device 200 preferably has a length such that ingested food and liquids bypass most of the stomach and at least a portion of the small intestine. Undigested food and liquids exit the distal end 210 of the sleeve device 200 into the small intestine reducing caloric absorption and eliciting physiological responses within the intestines. The gastrointestinal sleeve device 200 can have a constant diameter throughout its length or the diameter may vary along the length. The gastrointestinal sleeve device 200 can be impermeable along the entire length or some or all of the device may be porous or semipermeable. Preferably, the wall of the gastrointestinal sleeve device 200 is thin and flexible so that peristalsis is coupled to the internal lumen 208 of the device. A gastric sleeve that extends beyond the pylorus 220, with or without an intestinal sleeve, can allow use of the pylorus as a natural stoma by configuring the sleeve to close by the pylorus and then open to allow passage of food when the muscles of the pylorus relax. The section of the sleeve device 200 that passes through the pylorus 220 will preferably have enough wall flexibility or compliance to allow normal opening and closing of the pylorus to release and retain stomach contents and to allow drainage of stomach secretions around the outside of the sleeve. This can optionally be accomplished by the inclusion of pleats, channels or other structures to facilitate the collapse and sealing of the sleeve as well as passage of gastric secretions along the outside of the sleeve as shown in
Structures, features and methods illustrated in
The releasable attachment of the sleeve to the cuff as disclosed herein facilitates removal and replacement of the sleeve. Thus, the response of a particular patient to a first sleeve having a first length can be observed. If more or less intestinal absorption is desired, the first sleeve can be endoscopically removed such as by cutting the tension elements discussed below, and replaced by a second sleeve having a second shorter or longer length. Therapy is thus adjustable, which may be desirable if either the initial sleeve length was suboptimal or if it becomes suboptional due to post implantation changes such as stomach remodeling or behavioral changes.
Optionally, the sleeve can include coatings on its interior and/or exterior to enhance the surface properties of the sleeve in clinically relevant manners. Coating examples include: 1) parylene coatings to increase the chemical resistance of a sleeve material, 2) coating with an antimicrobial agent to resist infection and/or 3) coating with an anti-inflammatory agent to reduce tissue inflammatory response, as described herein. Similarly, the interior and exterior of the sleeve can optionally be coated with a low friction material (e.g. a hydrogel) to reduce friction of food passage (interior) and reduce gastric irritation (exterior). One example of such a low friction material is a lubricious coating such as the PHOTOLINK LUBRICIOUS COATING manufactured by Surmodics Inc. and disclosed on pg. 5, paragraph 58, in U.S. utility patent publication 2005-0049718, the disclosure of which is herein incorporated in its entirety by reference.
U.S. patent application Ser. No. 10/698,148 describes the use of biodegradable or bioresorbable materials for construction of a gastrointestinal sleeve device to obviate the need for removal of the sleeve device at the end of the treatment period. The entire gastrointestinal sleeve device or a portion of it may be made of biodegradable material. The gastrointestinal sleeve device may be made of biodegradable materials with different rates of degradation or resorption. The gastrointestinal sleeve device may be configured with a series of segments that biodegrade sequentially. For example, a first portion on the distal end of the sleeve may degrade first, followed some time later by a second intermediate portion and a third proximal portion. Next the attachment would degrade and, finally, the T-tags or other fasteners would degrade. Alternatively, the gastrointestinal sleeve device may be configured with a series of short segments of non-biodegradable material that are attached to one another with biodegradable material. The biodegradable attachment portions may be made of biodegradable materials with different rates of degradation or resorption so that they biodegrade sequentially. In either case, the biodegradable material would allow a gradual change of therapy over time, without having to revise or replace the implant. The patient could get used to the gradual change in therapy more readily than a sudden change and may be better able to avoid a rebound in weight gain. It may also allow for a safe mode of degradation and elimination. The device would degrade into pieces small enough that they could be eliminated without any danger of bowel obstruction.
Alternatively, selected portions of the gastrointestinal sleeve device may be made of biodegradable material. For example, openings in the sleeve can be covered with biodegradable material that will gradually degrade over time, eventually allowing food to mix with digestive secretions. The biodegradable material would allow a gradual change of therapy over time, without having to revise or replace the implant. The gastrointestinal sleeve device with the openings in it could be left in place for long-term maintenance of weight loss or it could eventually be removed.
In some embodiments the rate of degradation of the biodegradable material forming the sleeve could be coordinated with the natural pH of the anatomical environment and/or to properties of the material forming the sleeve, to achieve a predetermined sequential degradation of the implant. In accordance with one degradation sequence, a distal (intestinal) portion of the sleeve dissolves before the proximal (gastric) portion. For example, the sleeve could be constructed of a material that degrades at a faster rate in a relatively basic environment than in a relatively acidic environment such that the distal portion of the sleeve in the intestine would dissolve before the proximal portion of the sleeve in the stomach. The pH of the sleeve environment could also be altered by an external source, for example by ingestion of a substance that would change the pH of the stomach and/or intestine and thus hasten degradation of the gastric component. Alternatively, the distal and proximal portions of the sleeve could be constructed of two different materials with the material comprising the distal portion dissolving faster than the material comprising the proximal portion. Alternatively, the material forming the sleeve could be thinner at the distal portion than at the proximal portion such that the distal portion would dissolve in less time than the proximal portion. All or any combination of the above alternatives could be used to set the time frames of degradation of the distal and/or proximal portions of the sleeve depending on the desired performance.
Biodegradable material suitable for construction of a gastrointestinal sleeve device is sold under the name Plastifilm by OsteoBiologics, Inc., located in San Antonio, Tex. This biodegradable polymeric film material is described in U.S. Pat. No. 6,514,286, which is hereby incorporated by reference. Additional information from the supplier about this material is available at: http://www.obi.com/.
Another aspect of the present invention involves devices and methods for delivery and deployment of a gastrointestinal sleeve device into a patient's gastrointestinal tract. One method to facilitate delivery of the device into and through the patient's small intestine is to place a guidewire and/or catheter into the intestine to the depth desired and then push the gastrointestinal sleeve device over the guidewire. Successful techniques for placing a guidewire into the small intestines have been described by G. Long, T. Mills and C. P. Swain in an article entitled Techniques for advancing guide wires and devices in the lumen of the gastrointestinal tract. Another technique that could be adapted for placing a device such as a gastrointestinal sleeve device into the small intestine was described by H. Yamamoto and K. Sugano in an article entitled A new method of enteroscopy—the double-balloon method, Can J Gastroenterol. 2003 April; 17(4):273-4. These techniques can be used in combination with many of the delivery and deployment methods described herein and in the prior application.
Methods of insertion and retrieval of a gastrointestinal sleeve device are also described in the parent application. In addition to the methods described therein, a GI sleeve can be inserted and/or retrieved using a flexible endoscope. A skilled GI endoscopist can "drive" a special endoscope (an enteroscope) through the duodenum and deep into the jejunum. Because of its small size, a pediatric colonoscope can be used to access an area further down the intestine. With proper interfacing structure on a GI sleeve, the sleeve can piggyback on the endoscope as it is driven into the jejunum and then released with its distal end left in the jejunum when the endoscope is retracted and removed from the body. This can be accomplished perorally either before or after attachment of the proximal end of the sleeve to tissue or to a cuff at the GEJ or some other clinically desirable location.
Various structures can be used as an interface between the endoscope and the distal end of the GI sleeve device. If the sleeve device has a solid distal end or other graspable portion, such as a tab or loop near the distal end, a standard or custom endoscopic snare or grasper can be extended through the endoscope working channel to grasp the sleeve device. Alternatively, the distal end of the sleeve device can be configured with a socket or pocket to engage a flexible pusher, which may be configured as a rod, tube or guidewire. As another alternative, the sleeve device can be configured with a distal end that can be cut off to release the device. The distal end of the sleeve device is grasped with a snare or the like extended through the endoscope working channel. Once the sleeve device is delivered far enough distally in the GI tract, the distal end of the sleeve device is cut off to release the device.
In one embodiment, delivery of the sleeve device to an area sufficiently far down the intestine is facilitated by attaching a traction structure, such as a mercury ball, that increases the likelihood that the sleeve will be pulled down the intestine, to the distal end of the sleeve. During peristalsis the intestinal wall grabs hold of the traction structure and pulls it along with the distal end of the sleeve down the intestine.
Location of Attachment of the Sleeve Device
The present inventors believe that some areas of the esophageal or gastric wall exhibit physical properties more conducive to retaining attachment structures than other areas. For example, an attachment zone 8030, shown in
The device may, in one preferred embodiment, be attached in an attachment zone 8030 no more than about 2 cm and preferably no more than about 1 cm above the SCJ 8020 and below the esophagus 8000 where the squamous mucosa is thicker than the squamous mucosa of the esophagus 8000 and where there exists a serosal outer surface not exhibited at the esophagus 8000. The thicker layer of squamous mucosa in the attachment zone 8030 terminates distally at the endoscopically visible transition to the glandular mucosa of the stomach 8010 which occurs at the SCJ 8020. The device is also preferably attached at a location in the attachment zone 8030 so as to minimize the risk of reflux. The SCJ 8020 can be located relative to other anatomical regions. It normally may be found at the gastroesophageal junction (GEJ). The GEJ is the region at which the tubular esophagus joins the saccular stomach. The GEJ can be considered the first part of the stomach 8010 or the cardia and is located at the proximal margin of the longitudinal gastric mucosal folds or in the distal 2 cm of the esophagus 8000 and proximal stomach 8010. Endoscopically, the location of the GEJ can be approximated by identifying the proximal margin of the gastric folds.
Thus, a first aspect to the location of attachment of the devices disclosed herein relates to the position of the attachment structures along the axis of the hollow lumen or organ. As described above, the attachment location in the axial direction is preferably in the vicinity of the gastroesophageal junction, and particularly just above the SCJ. This attachment site can be located endoscopically by observing the color change which occurs at the SCJ, and retracting or positioning the attachment structures of the endoscope slightly above that line.
A second aspect to the location of the attachment structure relates to the depth within the adjacent tissue wall (i.e., in a transverse direction to the longitudinal axis described above) within which the various anchors or retention structures disclosed herein reside. Applicants believe that the location in the transverse direction is subject to migration or other change post-implantation, as described in connection with
Referring to
An attachment device or anchor 18 is illustrated in part in
Referring to
Tension element 24 may comprise any of a variety of connectors or elements adapted to extend through the tissue wall, such as a suture, or other single stand or multi-strand filament or material. In some embodiments the tension element 24 is formed of a polymer such as PEEK or silicone. The tension element 24 may also, in some embodiments, have elastic properties. In other embodiments the tension element 24 does not have elastic properties. By use of the term tension element, no specific mechanism is suggested, and the element is not required to be under mechanical tension.
The attachment device, otherwise sometimes referred to herein as a tissue anchor, T-tag or other label, it is illustrated in
Without being limited to any particular structure or mechanism, Applicants believe that the presence of the attachment device may cause or accelerate the formation of a layer 26 of serosal tissue having increased tissue density relative to unaffected or normal serosal tissue. The layer of increased density 26 may result from a process in which the transverse retention surface 22 places pressure against the serosa 10, causing a localized necrosis due to the restriction of capillary blood flow. The necrosed tissue thereafter fibroses, as a part of a normal healing response. The layer of increased density 26 or fibrosis may also result from a foreign body reaction triggered by the presence of the transverse retention surface 22. Applicants have observed a greater degree of fibrosis or denser tissue on the side of the T-tag facing the lumen of the stomach, for example on the retention surface 22.
In certain animal trials conducted by Applicants in which the animals were sacrificed five weeks following implantation of the attachment device 18, successful anchors appeared similar to the simplified schematic illustration of
It appears to the present inventors that formation of a sufficient fibrotic response on the proximal side of the retention surface 22 decreases the likelihood that the attachment device 18 will relocate to the inside of the stomach under normal agitation of the stomach, changes in the thickness of the stomach wall, and other conditions normally occurring in the stomach. A similar response is schematically illustrated in
It appears to the present inventors that if the device design and/or retention element 20 design are such that in normal use the retention element 20 relocates to a position in the muscularis 12 and past the serosa 10 before a sufficient fibrotic response, the retention element 20 may relatively easily pass through the muscularis 12 and failure will result. Thus, it may be desirable in certain implementation of the invention to facilitate or accelerate the formation of the fibrotic layer 26. This may be accomplished in any of a variety of ways which will be appreciated by those of skill in the art in view of the present disclosure, such as by the introduction of an active agent which will trigger a fibrotic response. Suitable active agents may include any of a variety of growth factors, and/or chemical sclerosing agents which are well known for other medical applications. Active agents may be applied as a coating to the retention surface 22 or retention element 20, or may be impregnated into the material of retention element 20, such as to permit a timed release into adjacent tissue. Incorporation may be accomplished by loading the active agent into tortuous pathways or pores exposed to the surface of the retention element 20, or by inclusion in a bioabsorbable or bioerodable carrier attached to or positioned in the vicinity of the retention surface 22. Energy sources may also be utilized, such as to generate heat or otherwise stimulate formation of a fibrotic response, as is discussed further below. Formation of the fibrotic layer 26 may also be facilitated by mechanical means, for example, in one embodiment, by roughening the retention surface 22 with the addition of fibrotic layer enhancement structures such as a plurality of bumps or etched lines.
T-Tag Attachment Embodiments
T-tag fasteners can be used to attach many of the structures described herein. A T-tag is basically a retention element 20 in the form of a cross member or "T" that is attached to a tension element 24 in the form of an elongated member or tail at or near the mid-point of the T. A "stem" may be a structure at the joining point of the T and tail. From the perspective of a peroral attachment technique, in which the attachment devices are preferably advanced through muscularis 12 in the direction of the serosa 10, the stem or tension element will be referred to herein as relatively proximal to the cross member on the T-tag. The T-tag is a member of a more general family of tissue anchors, in which a proximally facing surface 22 (such as the proximal surface of the cross member) is adapted to be bent, folded, or otherwise reduced in crossing profile to a first configuration in which it can be advanced distally through a relatively small tissue opening, to a second configuration in which it presents a proximal serosal surface contacting area for resisting proximal retraction through the access pathway. Thus, although described primarily in the context of a T-tag and variations thereof, the present invention relates more broadly to tissue anchors of the type for presenting a retention surface which may have any of a wide variety of configurations. Some are described in additional detail below. The stem may also be referred to herein as a tension member, and may comprise a suture, or other single strand or multi-strand element for drawing the tissue anchor against the serosal tissue and/or connecting the tissue anchor to the implantable cuff or other endolumenal implant.
T-tag fasteners are generally configured to flex or pivot at the juncture of the T and tail to allow delivery along the axis of the T through a minimal puncture diameter. T-tag fasteners can be configured with an extended tail that may extend out the mouth and optionally be used to parachute devices for attachment into position in vivo. Other T-tag configurations can include, crimp, snap, screw or other means of securing the T-tag tail when appropriate. One embodiment of a T-tag fastener could include a dual tail. Such a dual tail could be combined with extended tails that could then be tied out side the body with the ensuing knots then tightened within the body. Such a dual tail could be constructed of one of a number of non-biodegradable suture materials known in the art including polypropylene, nylon, braided Dacron or silk. In some clinical situations biodegradable tails could be indicated and could be constructed using materials described herein. In a preferred embodiment the tails could be constructed of a monofilament material.
In certain implementations of the present invention, it may be desirable to increase the effective surface area of the retention surface 22. This may be accomplished using any of a variety of disc or button shaped attachment devices 18 disclosed herein, or by introducing a buttressing component or element in the nature of a washer or other structure for enlarging the effective surface area. This buttressing structure may sometimes be referred to herein as a pledget. The buttressing material is generally configured perpendicular to the axis of the attachment means (e.g. suture, rivet or staple) and therefore best distributes forces along the axis of the attachment means. When a device is attached to the intragastric wall such forces can be directed inward from the gastric wall. Therefore, if the buttress is attached to the intragastric wall, the buttress may not be along the axis best suited to resist the applied force.
An alternate method of delivering these buttresses such as Fastener (T-tag) buttress (T-pledget) would be using a T-fastener (T-tag) where the "T" portion was constructed of a material with properties that would be useful as a buttressing material. This would be a T-tag buttress or a T-tag pledget. Some embodiments of T-tag pledgets, 920, are shown in
In a preferred embodiment the cuff would be attached as the T-tags are placed such that the sutures of the T-tags could be knotted outside of the body and the knots could be pushed down the working channel or outside of the working channel of the scope until positioned to retain the cuff. The suture tails could subsequently be removed. To facilitate management of all the suture tails, two T-tags could first be placed to secure the cuff followed by placement of the rest of the T-tags. In a preferred embodiment the T-tag tension elements, such as tails, sutures, or other structures as described herein, would terminate in the stomach, such as by tied knots, sliding buttons, or preexisting terminated ends, such that they would not need to be brought outside of the body.
In one embodiment deployment of the sleeve device and/or T-tags is achieved with the use of a remote controlled robotic endoscope. Generally, a remote controlled robotic endoscope comprises a user interface, a control device, and an operating unit. Commands can be inputted by an operator into the user interface to activate the control device which in turn guides the operating unit in three dimensions. The operating unit, in one embodiment, can be a fastener deployment head carried by a catheter which is positionable within the gastrointestinal tract and capable of attaching various fastener structures such as sutures and T-tags in response to commands received by the user interface. Monitors that display physical data and images of the anatomy to aid in navigation of the operating unit may also be used with a remote controlled robotic endoscope. Such an endoscope could scale the operator's movements such that large movements of the operator would translate into the smaller movements that may be required to maneuver the endoscope within the gastrointestinal tract. One embodiment of a remote controlled robotic endoscope is described in "Radiocontrolled Movement of a Robot Endoscope in the Human Gastrointestinal Tract," by P. Swain, T. Mills, B. Kelleher, L. Schmitz, S. Mosse, P. Burke, K. Ikeda, and A. Fritscher-Ravens.
T-pledgets can be structured using a variety of means. A portion of standard Teflon pledget material can have a suture tied or otherwise attached, at or near its mid point. This can be structured or otherwise prepared for delivery by means such as rolling and/or compressing to facilitate passage through tissue with a minimum disruption of the tissue layer. Ideally the T-pledget would have a minimum diameter when passing through tissue. Depending upon the clinical situation varying deployed diameters/areas could be preferred. A hollow needle or other hollow tube can be used to facilitate passage through tissue. Structure and/or material selection to enhance axial rigidity along the axis of delivery will be beneficial in some clinical situations. A piercing point on the leading edge of the "T" may be useful with some delivery mechanisms.
Many of the features described herein can be achieved with construction using a single piece of Polypropylene, Nylon, PEEK, silicone, or other polymeric material well known in the art for use in construction sutures, which forms the "T" and tail as a single unit. Alternately two different materials can be combined, for example by insert molding, to achieve different properties of the "T" and tail. In another embodiment this could be combined with a "T" portion that is coated with a material selected for specific clinical properties such as encouraging or discouraging either in-growth or adhesion. The "T" portion may also be surrounded by another material such as Teflon pledget material or Dacron graft material. "T" diameter will vary according to the material used for example ranging from 0.5 mm to 3.0 mm in diameter for nylon or polypropylene with the typical "T" having a diameter of 1-2 mm. A tail could be the dimension of a standard suture and could generally vary from 5-0 to 0 (USP standard classification) though smaller or larger sizes may be appropriate in certain clinical situations.
In one configuration that could have advantages in certain clinical situations the "T" and/or tail portions of the T-pledget could be constructed in part or wholly of a biodegradable material as described herein. In one such configuration the "T" portion would be constructed of a flexible buttress material that is not biodegradable. In some embodiments this could have a tubular configuration. This would include a core of a more rigid material that is biodegradable. The tail in this situation could be optionally biodegradable. This combination T-pledget can have advantages in that its "T" portion will 1) have increased rigidity for insertion; 2) maintain its rigidity during the time period while the tissue goes through its healing period and ideally until it regains its strength; and 3) become softer and more flexible to minimize the potential for erosion over the length of time the pledget is in position. Various buttress materials, both biodegradable and not, are described herein.
In an alternative embodiment a porous buttress material could be impregnated with a biodegradable material to achieve a similar result. Similarly a biodegradable material could coat a buttress material. The rigidity of both the permanent buttress material and the biodegradable material may be selected and modified to suit specific clinical situations. In some situations the biodegradable material may be of a lesser rigidity compared to the buttress material. Embodiments that include a biodegradable tail portion could have an advantage in certain clinical situations, as this would eliminate the tail as a focus for a leak after it has degraded. Bioresorbable materials such as polyglecaprone (Monocryl, Ethicon), polyglactin (Vicryl, Ethicon) or other as well know in the art can be appropriate for use in these applications.
Bio-stable, solvent dissolvable pledget material—In other situations the pledget material could be made from a material that is stable in the body but could dissolve in the presence of a biocompatible solvent, or a biocompatible solution including a chemical or catalyst that will initiate the pledget's dissolution. This would allow simplified removal of the pledget material via lavage of the peritoneum if the stomach attachment means were to be released through an endoscopic procedure or were otherwise desirable based upon the clinical circumstances.
Referring to
To deliver an improved buttressing capability in a T-tag fastener or T-pledget with a minimum delivery hole it is beneficial to use a "T" or pledget designed to expand after delivery. This can be beneficial in many clinical situations. In addition to rolling or compressing, alternate structures can include materials that expand when exposed to water such as hydrogels.
To resist bending perpendicular to the axis of the suture, it may be beneficial to use metals, for example Ti, SS or NiTi. In some clinical situations, encapsulating or coating the metal with a fluoropolymer or other coatings as described herein may also be beneficial.
T-tag with inflammatory reaction or other additives—The pledget material could be optionally coated or impregnated with materials and/or medicaments as described herein. For example the pledget can be coated with a material that would enhance inflammation and scar formation. Alternatively, a coating or medicament that would either encourage or discourage in-growth can be applied.
In some clinical situations it may be beneficial to use both these types of coatings. For example, though inflammation can lead to scarring fibrosis and ultimately strengthen tissue, the inflammatory process initially results in tissue weakening that can include tissue liquefaction. Therefore, it can be desirable that a fastener that induces an inflammatory response for long term strength also include means to support the tissue during the weakened stage.
Inflammatory reaction materials would be limited to a portion of the T-tag or T-pledget as the inflammatory response weakens tissue before the scarring fibrosis occurs. Therefore, for example, having the area at the center of the T or pledget with this inflammatory material and the ends of the "T" without this material could have an optimized balance of short term and long term strength.
Drug-eluting coatings may be used to encourage or discourage tissue ingrowth into the fasteners or other device attachment mechanisms described herein. A low inflammatory response is generally desirable for encouraging tissue ingrowth. Anti-inflammatory drugs that may be used include steroidal anti-inflammatory drugs, e.g. prednisone, and nonsteroidal anti-inflammatory drugs (NSAID), e.g. chromalin. Conversely, drugs that may be used to control or reduce tissue ingrowth include Taxol (paclitaxel) (Bristol-Myers Squibb) and Sirolimus (rapamycin) (Wyeth-Ayerst Laboratories).
Embodiments designed for improved erosion resistance—The purpose of the "T" or other retention element is to distribute and resist the forces that could act to pull it through tissue, in this case the gastric wall. To better achieve this result the "T" should resist excessive bending. Though a T-fastener is generally held parallel to the surface of the extragastric wall, at the ends of the "T" the gastric wall extends outward from the plane of the surface and the axis of the "T". In this case, the gastric wall could be at a 90-degree angle, or greater, to the ends of the "T". To reduce the potential for erosion at the end of the "T" in some clinical situations it could be beneficial for the ends of the "T" to have increased flexibility which will result in a reduction of the angle between the gastric wall and the ends of the "T". This would reduce the forces between the "T" and the gastric wall and therefore reduce the potential for erosion at the ends. Structures that could accomplish this could include tapered thickness or cross section to reduce the bending moment. Alternatively or in addition, changes in material properties such as hardness, bending modulus and/or elongation can accomplish the same result. For example the "T" near the stem could be of a material of a durometer such as Shore 65 D or higher and the material may change as one moves out along the arms of the "T" transitioning through 55 D/100 A to 90 A durometer or lower. Rounding, smoothing and structures that otherwise distribute forces over a larger area will also serve to reduce erosion at the ends of the "T". A circular shaped "T" may be particularly desirable to reduce erosion.
For each subsequent T-tag fastener 918, the previously placed fastener(s) may be used to stabilize the gastric wall. The fasteners may be used to assist in forming of a plication or in retracting and positioning the gastric wall for fastening another component, such as a stoma, sleeve or attachment ring. Similarly, other gripping means, such as vacuum, transmural hooks and the like, may be used to facilitate placement of retention elements 20 for fastening another component (e.g. cuff or bypass tube) of the system.
The toggle 662 helps to distribute forces that hold the fastener 660 in place over the length of the toggle 662, and also prevents the fastener 660 from being pulled through the hole. Alternative to the toggle 662, a similar functioning apparatus such as a disc or a multi-arm umbrella could also be used to distribute forces on the adjacent tissues while preventing the fastener 660 from passing through the hole. This fastener functions similarly to the T-tag fasteners described herein. Some of the attachment structures described herein such as that of
The construction of the surgical fastener 780 allows it to be removed if it is desired to reverse or revise the surgical procedure.
The attachment fasteners described in
Stapling, suturing or other attachment of the implant is preferably accomplished transesophageally with the use of a flexible endoscope. Sutures may be placed into the muscularis, through the muscularis and/or full thickness through the muscularis and serosa based upon the clinical situation. One method for accomplishing this involves the use of wire fasteners 130 that are formed with a "button" retention element end 132 and a "twist tie" or other device attachment end 134, which are shown in
The delivery cannula 136, which may be configured with a torquable shaft with a fixed or variable curve 144 at the distal end, is used to deliver the wire fasteners 130 to the desired location. The distal end of the delivery cannula 136 is advanced until it contacts the stomach wall, then a pusher wire or the like is used to advance the wire fastener 130 through the delivery cannula 136, as shown in
In an alternate embodiment, the wire fasteners may be configured to have a "button" portion 132 on both ends of the wire. These fasteners can be deployed laparoscopically to penetrate both walls of the stomach with a "button" 132 placed on each side of the stomach to attach the walls together. Such fasteners can be combined with buttressing reinforcements such as pledgets made from Teflon, bovine or porcine tissue or other know materials. "T-tag" type fasteners could be applied to this use and type of application.
One of the difficulties encountered with the use of fine filaments, such as suture threads, for attachment of implants within the gastrointestinal system is that the filaments can cut through the tissue in the same way that a wire cheese cutter cuts through a block of cheese. When the force on the filaments is perpendicular to the tissue wall, the force can be distributed over the tissue with a pledget and/or with a T-tag fastener. However, when there is a large enough component of force transverse to the tissue wall, the filaments can cut sideways through the tissue. The use of a stem, for example the tubular standoff as described above can distribute the force sufficiently to avoid this cheese cutter effect.
In a preferred embodiment the attachment structure, for example a non-plicating transmural attachment structure, would maintain the natural anatomical shape of the stomach and move with the stomach rather than constrain its movements. An attachment structure that does not interfere with the natural movements and shape of the stomach may reduce the cheese cutter effect and/or other failure modes that may increase the risk of relocation of the T-tags into the stomach.
This and other alternate configurations can be used to optimize pressure distribution and flexibility of the T-member. The T-member 2100 has a double eyelet 2108 for attachment of a suture or other filament and a groove between the eyelets so that the bight in the suture will be recessed into the body of the T-member 2100. The T-member 2100 is preferably molded of a fairly rigid, high strength biocompatible polymer such as PEEK.
It may be beneficial to limit the pressure applied to the tissue in order to avoid tissue necrosis and erosion at the attachment points. A T-tag fastener can be configured with two suture threads going to the midpoint of the T-member, as shown for example in the anchor embodiment of
Alternatively, the two suture threads can be tied together to create a stop at a selected distance from the T-member. This is less preferred because the knot would likely have to be pushed through the tissue to allow the T-member to pivot to the deployed position, then pulled back through the tissue. This would require more force as there would be drag on the knot and the hole through the tissue would be a bit bigger. Other alternatives to create a stop or common length of 2 sutures include use of a tightly fitting tube, for example heat shrink tubing, an adhesive (e.g. epoxy), a biodegradable adhesive (e.g. cyanoacrylate) or fusing the 2 filaments over the desired length. Use of a slidable tube for this purpose is described herein. Such tubes can be polymers (e.g. PE or Teflon) or metals (e.g. SS, NiTi or Ti) PB and Teflon tubes can be either heat shrinkable or of fixed diameter depending upon the desired performance.
In the above examples where it has been suggested that a fixed distance between the T-member and the device it is being used to attach is desirable it has been suggested that in some cases a distance greater than the thickness of the captured gastric wall may be clinically indicated. This is due to the ability/tendency/possibility that the gastric wall could react to the presence of a foreign body (the attachment structures) by thickening. In this event, in some cases, it can be clinically preferable that the preset distance accommodate some or all of this increase in wall thickness.
The previous applications discussed mucosal ingrowth as a means to stabilize and seal an implant device, and to assure long-term attachment in the stomach. Alternatively or in addition, the T-member of a T-tag fastener can be configured to encourage serosal ingrowth or fibrosis for stabilization at the serosal surface, as shown in
A dissolvable sheath (e.g. sugar, gelatin or other rapidly dissolving material) or stem can be used to control the position of a knot in the suture as it can be used to prevent the knot being tied where the sheath is over the sutures. Furthermore, structures and methods that encourage tissue motion relative to the suture and the suture track can have an impact on tissue healing that can be beneficial or detrimental depending upon the clinical situation.
The T-member of a T-tag fastener can be configured with a sharpened distal tip to pierce the tissue without the need for a separate insertion cannula. The T-member can be detachably mounted on a pusher shaft with a female socket on the proximal end of the T-member into which the pusher shaft is inserted. The sharpened distal tip of the T-member can be made from a material that dissolves or is bioabsorbable to provide a less traumatic long term implants. T-tags can be configured with other T-member or cross bar shapes, with a single suture, with or without needles on the ends of the sutures, and with a variety of cross member materials. These materials can include polymers such as fluoroplymers, PU, PET, PEEK or silicone. They can also be made from metals such as 55, NiTi or Ti or polymers reinforced with metals or other materials well known in the art (e.g. glass or aramid fibers. Furthermore, is some clinical situations materials that are biodegradeable, as described in the prior applications, could be beneficial.
Generally, the spacer 224 should be configured to limit the amount of compression applied to the gastric or esophageal wall upon deployment of the fastener 222. Where some compression is desired, the spacer distance, that is the distance along the stem from the T 226 to the proximal cap 232 after deployment, should be slightly less than the total thickness of the tissue and other structures to be attached. The spacer distance should take into account whether a single-wall transmural attachment or a double-wall plicated attachment is intended, as well as the thickness of any device structures that will be held by the fastener. In cases where it is not necessary to apply compression, the spacer distance may be greater than the total thickness of the tissue and other structures to be attached.
In an alternate embodiment of the T-tag fastener 222 of
The T-tag fastener 222 of
A gastrointestinal sleeve, a mounting cuff or ring or other device may be attached directly to the gastric wall using several of the T-tag fasteners or other attachment devices as rivets. Alternatively, the stem and/or the proximal cap may be configured with a nubbin (
The low profile provided by the tandem configuration of the T member 244 and spacer 242 is desirable to minimize the size of the needle or cannula 248 needed to deliver the fastener 240. This is important not only for minimizing the size of the tissue puncture, but also to reduce the amount of force needed to deliver and deploy the fastener 240 through an endoscope. The delivery needle or cannula 248 will preferably be 17 gauge or smaller, more preferably 19 gauge or smaller.
The T-tag fastener 240 is typically deployed as a blind fastener, for example for transmural attachment through the gastric wall. The delivery cannula 248 is used to pierce through the tissue to be attached; then the T member 244 is pushed out of the cannula 248 on the far (serosal) side of the tissue using a pusher rod or tube that extends through the cannula 248. The needle or cannula 248 is withdrawn and the T member 244, which is now approximately perpendicular to the sutures 246, is snugged up to the back surface of the tissue with a little tension on the sutures 246, as shown in
Inflatable/Injectable Soft-Tissue Anchor Attachment Structures
Many suitable soft-tissue anchors include monolithic anchors, multi-component anchors, flip-style anchors, expanding anchors, rivet-style anchors, zip-tie style anchors, and sliding knot-style anchors. Expanding balloon anchors may also be used for transmural, suture-less attachment that may be easily deployed through a small delivery needle and flexible endoscope and that have large surface areas that interact with surfaces of soft-tissue, such as the outer surfaces of the esophageal or gastric wall, for increased attachment strength.
In some aspects of the invention the balloon anchor 2304 is preferably an inflatable or injectable dual-ended balloon anchor for soft-tissue which when expanded has a barbell-style profile. When unexpanded this anchor 2304 folds up and fits into a small delivery needle. The anchor 2304 is formed of thin-wall silicone or polyurethane that is expandable. After the anchor 2304 is delivered to the desired soft-tissue location via a delivery needle and flexible endoscope it is expanded, preferably with silicone, while in place. After the silicone cures the anchor 2304 attains its barbell-style profile with very large surface area interfacing with the outer surface of the soft-tissue. This large surface area helps prevent pull-out of the anchor 2304. The ratio of expanded surface area to unexpanded size is unmatched by other systems and provides maximum pullout strength with minimal tissue defects or trauma. Furthermore, after the silicone has solidified, concerns about leakage, deflation, and toxicity are eliminated, and the result is a reliable, long-term, implantable anchor 2304. The curvature, soft corners, and flexibility of the anchor balloons 2304 reduce stress concentrations thereby preventing pressure necrosis and ischemia and resulting in long-term attachment strength. The barbell ends also preferably comprise a self-sealing membrane or self-sealing end caps 2308 that seal upon removal of the inflation needle. In one embodiment, shown in
Alternate anchor embodiments, as depicted in
- one-ended inflatable anchors (
- inflatable anchors with different end geometries including discs, convex or concave bowls, mushroom-heads, and "L" or "T"-profiles (
- inflatable anchors filled with polyurethane, saline, air, nitrogen, other low-to-high durometer silicones, PMMA (polymethyl methacrylate), bone cement, or any other inert gas, liquid, or semi-solid,
- multiple-component anchors with two end balloons connected via a connection tube or channel, the assembly being adhesively or otherwise bonded together,
- anchors comprised of osmotic membrane that expands and swells when immersed in a fluid environment, such that it would not have to be inflated by the user,
- anchors with connection channels of adjustable lengths adjusted based on tissue thickness measurements taken intra-operatively using concentric shafts with threads, ratchets, detents and other features.
- one-ended inflatable anchors (
All of the above anchor embodiments can be of various sizes. Mounting features, as shown in
Sleeve Assemblies
Preferably the sleeve embodiment 31D comprises a polyurethane sleeve with holes 2400 at the proximal end to quickly and securely attach over and engage with the internal anchor mount feature. The proximal end of this sleeve embodiment is very compliant and can accommodate the stretch and collapsing nature of the gastro-esophageal junction. This sleeve embodiment also incorporates a silicone ring safety device which can be inflated after sleeve delivery and prevents sleeve passage through the pylorus in case of detachment.
Alternate sleeve assembly embodiments include:
- a sleeve that incorporates a restriction or stoma 2500 at the proximal end of the sleeve to encourage early satiety (
- a sleeve mount feature which includes two compliant rings 2600 that allows the sleeve to float over the anchor mount features to accommodate the contraction and expansion of the GEJ while still providing for secure sleeve attachment to the soft-tissue (
- a sleeve mount feature which comprises j-hooks or loops to engage with and mount on the anchor mount ring feature.
- a sleeve that incorporates a restriction or stoma 2500 at the proximal end of the sleeve to encourage early satiety (
In one aspect of the invention, a stem-frame positioning system that facilitates circumferential placement and spacing of the anchors inside a tubular soft-tissue structure, such as the gastro-esophageal junction, is provided, as shown in
- Place two anchors 2700 at the GEJ at opposing positions (
- Place the stem frame (
FIGS. 31B-31C) over two tissue anchors 2700 to allow proper positioning of the other tissue anchors 2700.
- Insert remaining tissue anchors 2700.
- Remove the stem frame (
- Place a sleeve 2900 around the anchors 2700 (
- Place two anchors 2700 at the GEJ at opposing positions (
In one embodiment of the invention, the deflated balloon anchor 4028 is placed within a slotted needle 4000 as shown in
Mechanical Cuff-Link Soft Tissue Anchors
Aspects of the present invention disclose a mechanical cuff-link anchor which is a dual-ended flip-style anchor attachment structure which can be transmurally deployed to soft-tissue via a small orifice, such as a delivery needle. The anchor is banana-shaped with an elliptical cross-section. The large surface area of the anchor interfacing with soft-tissue surfaces results in decreased stress concentrations. The rounded edges and curved profiles of the anchor also decrease stress concentrations. Decreasing stress concentrations prevents pressure necrosis and ischemia which result in anchor pull-out and failure. Thus, the anchor embodiments of the present invention provide strong, long-term attachment. In one embodiment, the anchor is a fixed length anchor such that over-tensioning that leads to pressure necrosis is prevented. The anchor length may be adjusted, in other embodiments, to accommodate tissue thicknesses up to 25 mm. The small size of the anchor permits delivery through a flexible endoscope. The anchor also includes a pinned connection between the strut and external anchor which allows the anchor and strut to be delivered via a needle and then deployed on the external soft-tissue surface. Because no sutures are required in deployment the long-term embrittlement and fracture issues associated with sutures are avoided.
As depicted in
Alternate embodiments of the anchor include:
- a monolithic external anchor and strut with a living hinge about which to rotate the anchor and that connects quickly and securely to the internal anchor,
- an internal anchor that includes a mount ring or feature that may be utilized to connect the device being anchored in soft-tissue,
- a connection strut that also includes a mount ring or feature that may be utilized to connect to the device being anchored in soft-tissue,
- an internal anchor that is a monolithic anchor that can elastically deform to accommodate the strut engagement features; and
- a fixed length connection strut between 2 mm and 25 mm in length which positions the internal anchor at the predefined distance away from the external anchor.
In one embodiment, delivery of the mechanical cuff-link anchor is achieved with the aid of a pushrod 4012 shown in
In another embodiment, a pushrod 4012 has a well 4024 that bypasses the strut component 4008 of the mechanical cuff-link anchor such that pushrod 4012 pushes only the anchor or T-tag component 4004 as shown in
When placing T-tag fasteners or other fasteners in the region of the GEJ, it is important to avoid other anatomical structures in the vicinity of the stomach and esophagus. One method for this is to create a safe space behind the GEJ for deploying the fasteners. One method to accomplish this is described in the parent application Ser. No. 10/698,148. Alternatively, one can take advantage of the fact that the proximal stomach generally lies just below the diaphragm when the patient is in a head-up position. Space will be created between the stomach and diaphragm into which transmural fasteners can be safely placed. This safe space can be increased by having the patient inhale deeply while in a head-up position to push the stomach down with the diaphragm, then exhale to lift the diaphragm up off of the stomach. Preferably, the fasteners 250 will be delivered parallel to the diaphragm 252, as shown in
Alternatively or in addition, pneumoperitoneum can be used to create a safe space around the stomach and esophagus. Pneumoperitoneal pressure will tend to collapse the stomach away from other surrounding organs and would be balanced by the pressure used to endoscopically insufflate the stomach for improved visualization and access.
Other tactics to avoid other anatomical structures in the vicinity of the stomach and esophagus include the use of imaging techniques such as fluoroscopy, esophageal ultrasound imaging, external ultrasound imaging and/or Doppler imaging when placing fasteners. Alternatively or in addition an "endoscopic compass" can be used to provide a reference for orienting the endoscope when using fastening devices. A small magnetized needle (i.e. a compass needle) is placed near the distal end of the endoscope where it can be viewed by the operator through the endoscope. A magnet is placed on the patient to provide a reference point for the compass, for example the reference magnet can be placed on the patient's back directly over the spine. The compass needle will point toward the reference magnet on the spine. Using the compass needle as a reference, the operator will be able to avoid inadvertently puncturing the aorta, which lies directly posterior to the esophagus.
The concept of the Veress needle can be adapted for avoiding puncturing other anatomical structures in the vicinity of the stomach and esophagus during endoscopic attachment of devices near the GEJ. A Veress needle is a needle equipped with a spring-loaded obturator that is often used for insufflation of the abdomen in laparoscopic surgery. A long, flexible device with a needle at the distal end and a spring-loaded obturator within the needle would be used to safely puncture the gastric or esophageal wall. Once the needle has passed through the wall, the spring-loaded obturator advances automatically to avoid damage to any surrounding tissues. A delivery cannula can be advanced over the needle and the needle can be exchanged with a fastener delivery device. Alternatively, this concept can be adapted directly into the fastener delivery device. A T-tag fastener or the like would be spring-loaded into the lumen of a delivery cannula so that it would be ejected out of the lumen immediately after the cannula has traversed the gastric or esophageal wall.
Another method for avoiding deploying fasteners into the aorta would involve a small diameter needle with a flow detector (e.g. a Doppler flow sensor) or pressure detector for detecting blood flow or blood pressure. Alternatively, a flow detector or pressure detector can be mounted on a separate guidewire inserted through the needle. The flow detector can be used to detect blood flow before the wall of the aorta is punctured. Alternatively, if backflow of blood or blood pressure is detected, indicating that the needle has punctured the aorta, the needle will be withdrawn and a fastener will not be delivered at that site. The small diameter puncture in the aorta should heal without complications.
Alternatively or in addition, the organs and other anatomical structures in the vicinity of the stomach and esophagus can be protected during endoscopic attachment techniques by using a depth stop on the needle or delivery cannula to prevent it from penetrating farther than necessary to traverse the gastric or esophageal wall. Examples of fastener delivery devices with a depth stop to protect nearby organs and structures are described in U.S. provisional patent application 60/569,442.
One method for placing an implantable device within a patient's body has been described as a "parachuting" technique. In this technique, multiple elongated sutures are sewn through the tissue where the device is to be implanted with the ends of the sutures extending out of the patient's body. The ends of the sutures are passed through a sewing ring or similar structure on the device while the device is still outside of the patient's body, then the device is parachuted or slid into place along the sutures. The device is typically secured in place by knotting the elongated sutures with the help of a knot pusher or similar device and then the sutures are cut off close to the knots. U.S. provisional patent application 60/534,056 describes a variation of this method for implanting a device within a patient's digestive tract using T-tag fasteners. Alternatively, suture locks such as those described in U.S. Pat. No. 4,235,238 or those used in the BARD Endocinch system can be used to secure the suture prior to cutting.
When parachuted into place along the sutures, the device may be folded or compressed to pass through the esophagus or through a delivery tube placed in the esophagus. When using this parachuting technique it is desirable to minimize the friction between the device and the sutures. This can be done by using a low friction material or a low friction coating on the sutures and/or the device. This is also done by dimensioning and/or orienting structures, e.g. holes, to guide the parachuted device to reduce friction.
Alternatively, the device 120 may be partially parachuted into place, meaning that 2-4 parachute sutures are used to slide the device 120 into position with the proper orientation. Then additional fasteners, for example T-tag fasteners, are delivered to complete the attachment of the device 120 to the tissue.
If suture tails are delivered through a closed lumen (e.g. in or attached to an endoscope), the lumen must be removed from around the suture tails before a device can be parachuted over the sutures if the device is too large to pass through the lumen. This can present a challenge related to maintaining the organization of the suture tails and preventing confusion, crossing, winding and/or tangling of the suture tails. If T-tag fasteners and their suture tails are passed externally e.g. through an external lumen with a longitudinal slot or in a non-enclosed rail type system, the suture tails can be managed external to the lumen used to place the T-tag fasteners and external to the scope. This facilitates manipulation of the scope, simplifies scope exchanges and simplifies suture tail management.
Suture tail management external to the scope or an enclosed lumen can be combined with suture holders external to the patient, similar to those used for parachuting replacement heart valves into place. Snugging the sutures as described above is simpler when the suture tails are external to the scope, as is avoidance of crossing, winding and/or tangling of the suture tails. Suture holders, such as slots, clamps or clips, can be combined with a mouth guard for organizing the sutures during a peroral parachuting procedure.
One aspect of suture tail management is that it must happen from one end of the system to the other. Therefore, the method and apparatus must address this issue. For example, after placement of a T-tag fastener, a slight tension on the suture tail can hold the suture against the wall of the lumen or in a straight position where it is less likely to tangle. Apparatus can include means to maintain tension while allowing scope movement and manipulation, e.g. tension from a long soft spring, an elastic band or a spring-loaded reel.
Sometimes, when performing an endoscopic procedure, an overtube is used to line the esophagus and protect it from damage due to insertion and manipulation of the endoscope and related tools and devices. Other practitioners prefer to avoid the use of an overtube. In either case, it may be desirable to secure an implant being parachuted down the esophagus in a collapsed, folded or otherwise reduced configuration. A major issue when parachuting a device into place is friction between the device and the sutures, and collapsing or folding the device may exacerbate the problems with friction.
The following method is intended to reduce the problems with friction between the device and the sutures when parachuting a device through the esophagus. The method allows the device to be parachuted through the esophagus in a folded configuration, while it also allows the sutures to pass through the device while it is in an unfolded position. In addition, the method allows the sutures to be pulled through the device one at a time, which further reduces the problems with friction. This method can be used, for example, with the t-tag and/or t-tag delivery systems described herein.
1) Place fasteners (e.g. 6-10) in or through gastric wall with suture tails extending out through the patient's mouth; the sutures should have a length that is about 100-140 cm longer than required to exit the mouth;
2) thread suture tails through the device to be parachuted into place, e.g. an implant mounting ring;
3) slide the device down the sutures until it is just outside of the patient's mouth, with 100-140 cm of suture extending beyond the device;
4) fold or collapse the device and secure it in the collapsed position, e.g. with a removable sack or tied with a suture;
5) slide the device through the esophagus or the scope overtube (the device is not slid down the sutures, but instead the sutures are allowed to move with the device into the esophagus with the ends of the sutures remaining outside the patient);
6) once the device is through the esophagus and inside the patient's stomach, the device is release from its collapse position, and any restraining device that was used is removed perorally;
7) while controlling the device (e.g. with a grasper), and preferably under direct vision, pull each suture through the device until all the slack is removed and the device is at or near its intended position in the stomach;
8) position and secure the device in its intended position in the stomach.
In some embodiments, a stopper member 107, or other securing means such as an adhesive, crimp or knot may be used alone or in combination to create a tapered or gradual proximal transition, which may facilitate passage of the secondary T member 106 through other structures as shown in
The fastening gap determines the tension on the suture 104 and hence the pressure on the tissue exerted by the primary T member 102 and the implanted device 120. Optionally, this gap can be variable and or changeable as described herein.
Other configurations of fasteners and fastener delivery devices known in the art can be used in conjunction with the present invention. For example, U.S. Pat. No. 4,235,238 describes various fasteners and endoscopic fastener delivery devices for use in the gastrointestinal system. Other attachment and/or parachuting approaches can be used with these dual t-tag fasteners to secure devices, for example, to plications.
Another method for deploying a T-tag is shown in
By way of example, the sewing method is described below using the embodiment of the sewing device shown in
Method Steps:
The flexible endoscope 5004 is maneuvered to the target tissue.
The needle catheter 5008 is advanced through the biopsy channel of the scope 5004.
The split protective needle sheath 5012 opens as the needle 5016 emerges from the tip of the scope 5004.
The needle 5016 is plunged into the gastric tissue 5020 to a depth of 2-3 mm, with the open protective needle sheath 5012 acting as a stop to control the depth of needle 5016 penetration.
The pusher 5024 is advanced to eject the T member 5028 of the T-tag fastener 5032 from the distal end of the needle 5016 just beyond the serosal surface 5036.
The needle catheter 5008 is withdrawn into the biopsy channel of the scope 5004 and the split protective needle sheath 5012 closes.
The suture 5040 is secured by tying or by pushing a suture lock 5044 onto the suture 5040.
Optionally, the device may be configured to perform the sewing, locking and cutting of the suture in a single action. If the suture is passed through an open locking mechanism over the needle, the suture could be locked by pushing the catheter, sheath and lock forward.
Delivery cannula devices/systems (hereinafter delivery cannula) can be configured for the delivery of multiple T-tag or other fasteners. In particular these delivery cannulae allow placement of multiple T-tags (or in the case of a dual-headed T-tag fastener, primary T members) through a layer of tissue and/or a device while facilitating the management of multiple fastener suture tails.
A delivery cannula can include some or all of the following components, which will be described in more detail below in relation to specific embodiments of delivery cannulas:
penetrating cannula to penetrate the tissue and deliver the T member of the T-tag;
transit cannula to delivery the T-member of the T-tag to and into the proximal end of the penetrating cannula;
loading cannula to load or position the T member of the T-tag at and into the proximal end of the transit cannula;
garage or protective cannula to provide a shield into and out of which the penetrating cannula can be advanced and retracted when appropriate;
pusher to perform any or all of the functions related to advancing a T-tag through the loading cannula, through the transit cannula, through the penetrating cannula and expelling the T-tag out of the penetrating cannula.
In a basic delivery cannula embodiment, the first components are a single elongated hypodermic tube with a sharpened distal tip as the penetrating cannula and a wire or rad as the pusher. This type of device generally delivers a single fastener before being withdrawn to clear the suture tail from the tube. A more complicated delivery cannula is similar to the above, but incorporating a longitudinally slotted hypotube. This allows the tail/suture of the T-tag fastener to be external to the hypotube and allows a smaller diameter hypotube as well as other suture/tail handling advantages. In this case the above-mentioned penetrating, transit and loading cannulas are embodied in the single cannula.
In all the delivery cannulas, the penetrating cannula must be movable relative to the tissue through which it penetrates for T-tag fastener delivery. In a basic delivery cannula, the penetrating cannula will move in conjunction with the transit cannula and loading cannula. In more complex delivery cannulas, the penetrating cannula will move relative to the transit cannula and/or loading cannula.
The delivery cannula can be configured to be used:
1) within the biopsy channel of an endoscope;
2) attached to the exterior of an endoscope;
3) as a stand alone device with a separate means of aiming/visualization.
The delivery cannula should include means to keep the penetrating cannula point from inadvertently damaging tissue or the device through which it is delivered. For example, a Varess needle style obturator or other obturator can be used. The obturator must be removed to deliver the T-tag fastener through the lumen of the penetrating cannula. An external needle protector, or garage, may also be used, which has the advantage that it would not have to be removed for T-tag fastener delivery. A slotted garage could have additional advantages for T-tag fastener delivery. A penetrating cannula that is spring loaded within a garage where it only exits the garage under the impetus of a pusher in preparation to penetrating tissue would also have certain advantages.
Retracting the penetrating cannula into the biopsy or instrument channel of the endoscope will protect the tissue from inadvertent damage, but not the lining of the instrument channel. To protect the biopsy channel, the penetrating cannula could be retracted within the transit cannula or into a structure (garage) located at the juncture of the penetrating cannula and the transit cannula.
As an alternative to the slotted hypotube previously mentioned, a magnetic or mechanical rail system can be used in place of or in combination with the transit cannula. In this case, the pusher captures the primary T member 102 for delivery to the penetrating cannula. The pusher is magnetically or mechanically coupled to the transit cannula.
Similarly, a smaller diameter, short length slotted hypotube transit cannula can be used with a monorail T capturing pusher as a means to transfer the T-tag fastener to the penetrating cannula. In this context "monorail" refers to a short distal coupling section such as those used to couple a monorail or rapid exchange catheter to a guidewire. In this case, the monorail transit cannula, such as shown in
Having elongated suture tails extending out of a patient's mouth (or other orifice) with an associated need to pass devices over the suture tails can be cumbersome if standard "exchange length" techniques are applied. A monorail style device could be used through an internal or external endoscope lumen or independent of the endoscope. This type of design allows control of the T member in a short slotted cannula while the majority of the length of the suture tail would be external to an elongated transit cannula. This may also provide an easier path for the long suture tail as when an elongated slotted cannula might not maintain a slot free of obstruction when the endoscope was subjected to flexion.
If the monorail portion of the device extends out of the lumen of the endoscope, the monorail portion can optionally be of sufficient length to partially remain within the endoscope lumen to provide improved support and manipulation capability.
A two-channel endoscope can be used to deploy a series of T-tag fasteners. In one method of using such a 2-channel endoscope the T-tag fasteners are delivered through the first channel of the scope. The distal T members of the fasteners, individually or collectively, are placed outside the distal end of the scope. A delivery device is placed in the second channel and positioned near the distal tip of the scope. A capture/pusher device is passed through the first delivery cannula and a single distal T member is captured and drawn into the delivery cannula. The penetrating cannula of the delivery device is preferably slotted. The delivery device is used to deploy a series of T-tag fasteners into the tissue in the manner described above. The steps of T member capture by the pusher, drawing into the delivery cannula and deployment are repeated for each T fastener. As the endoscope is removed from the patient, the multiple suture tails of the T-tag fasteners are drawn out of the distal end of the first channel of the endoscope. The suture tails should be long enough to extend out of the patient's body, for example out through the patient's mouth. Labeling, color-coding or other means may be used to help organize the suture tails. A device can be threaded onto the proximal ends of the sutures and parachuted into place. Optionally, the ends of the suture tails may have needles attached to facilitate passing the sutures through preformed holes or a sewing ring on the device.
A tubular member that functions as a garage or protective shield 152 for the penetrating cannula 114 may be mounted externally on the endoscope 142, e.g. with one or more interference fit mounting clips 144. The garage 152 has an ID larger than the penetrating cannula OD to allow sliding of the penetrating cannula 114 relative to the garage 152 with clearance and/or a slot 154 for the suture tail. The penetrating cannula 114 may be spring mounted in the garage 152, so that the penetrating cannula 114 retracts into garage 152 automatically or upon withdrawal from tissue.
The distal end of the transit cannula 156 connects to the proximal end of the garage 152. The garage 152 and the transit cannula 156 may be constructed of separate pieces of tubing as shown or, alternatively, they may be constructed of one continuous piece of tubing. The transit cannula 156 has a diameter the same or slightly larger than the penetrating cannula 114, optionally slotted, mounted externally on endoscope 142, e.g. with one or more interference fit mounting clips 144. In conjunction with the pusher 122, it delivers the T-tag fastener 100 to the penetrating cannula 114 while it is positioned in the garage 152. Preferably, it is designed to prevent binding when the endoscope 142 is deflected, including retroflexed, e.g. with a bellows or other flexible structure 158 at major flex points. The transit cannula 156 may be ferrous/magnetic for magnetic coupling between the transit cannula 156 and pusher 122. Alternatively, it could be a mechanical coupling or alternatively could use a monorail configuration.
A loading cannula or other fastener loading mechanism attaches to the scope biopsy port or scope handle. The loading cannula may load the pusher with T-tag fasteners individually or may feed T-tag fasteners from a magazine to pusher for delivery of multiple tags.
The T-tag fastener delivery device could use any long tail T-tag fastener, including the dual headed T-tag fastener described herein and in the prior application.
Other aspects of T-tag fastener delivery devices 150 include:
1) ease of use related to exchange of devices;
2) management of the tails 104 of previously inserted T-tag fasteners 100.
If used through an endoscope lumen or external to the endoscope, the delivery cannula or its components would be flexible to accommodate the flexing and articulations of the endoscope. Flexibility can be provided, for example, by the following features singly or in combination, over the full length of the device/component or at selected locations:
1) flexible and/or elastic polymeric material (e.g. PU, PE, PEBAX);
2) a superelastic metal material (e.g. NiTi);
3) a coiled or braided material (e.g. 304 stainless steel with or without a polymer coating);
4) a radially slotted material (e.g. 304 SS or NiTi);
5) a bellows (e.g. 304 SS or NiTi).
Longitudinally slotted cannulas have advantages related to cannula sizing and also for delivering multiple T-tag fasteners. The suture tails of each T-tag fastener can exit the cannula through the slot after the fastener is deployed so that they will not damage or interfere with subsequently deployed fasteners. A parachute T-tag fastener or a snap T-tag fastener, described below, can have particular advantages in this regard.
One aspect in common between the parachute T-tag fastener 100 and the snap T-tag fastener 130 is the presence of a relatively large retention element (i.e. the proximal T member 106 or the snap 132) on the suture tail 104 in proximity to the distal T member 102. With appropriate dimensioning, the proximal T member 106 of a parachute T-tag fastener 100 or the snap 132 of a snap T-tag fastener 130 remains outside the slotted penetrating cannula 114 and facilitates positioning the suture 104 outside of the cannula 114, as shown in
The interface between the proximal end of the keyed wire 174, the T-tag fastener cartridge magazine and the pusher assembly 182 can all be combined in a deployment handle assembly similar to the one shown in
In this embodiment, once the loading cannula and cartridge are mated, further advance of the mated cartridge and pusher rod would result in:
1) transit of the T-tag fastener in its cartridge to the distal end of the endoscope;
2) penetrating cannula extension;
3) holding and/or advancing the penetrating cannula when tissue is pierced (could be simultaneous with step (1)
4) holding penetrating cannula extended when T-tag fastener is deployed.
Retraction of the pusher rod would:
1) allow retraction of the penetrating cannula through the tissue;
2) pull the cartridge in a proximal direction to the proximal end of the endoscope (an interface e.g. mechanical or magnetic would be required);
3) position the cartridge for being expelled into a storage chamber.
When placing T-tag fasteners it can be beneficial to orient the T members in a specific direction relative to the anatomy. Two approaches are discussed:
1) orientation by delivery cannula;
2) orientation by pusher.
If a non-slotted penetrating cannula is used, then an oriented pusher or keyed cannula or keyed pusher and keyed T member can be used to control the orientation of the T member as it exits the delivery cannula.
Use of a slotted delivery cannula with the suture tail of the T-tag fastener positioned through the slot can maintain orientation of the T member as it passes through the delivery cannula. This may be sufficient to orient the T member, but the suture tail will generally exit the slot before the T member is fully deployed. Keying the proximal portion of the T member to the slot can improved control of orientation during deployment.
As shown in
Another aspect of the T-tag fastener delivery device shown in
The T-tag fastener delivery device may have a fixed orientation with respect to the endoscope. Preferably, a visual indication of the delivery device orientation is provided for the endoscope operator. Alternatively, the delivery device may be rotatable with respect to the endoscope. This will require a mechanism for controlled rotation of the delivery device, e.g. a rotating shaft with gears to transmit the rotation to the delivery cannula, and a visual indication that changes to indicate the rotational orientation of the delivery cannula. With a video endoscope, this can be done electronically and indicated on the viewing monitor.
It is also possible to orient a T member 102 of a fastener after insertion. As shown in
Similarly, the T member can be oriented directly by a rotational drive tool 330 that is passed over the suture tails and through the tissue, where it engages the side of the T member 102 to transmit rotation to the deployed T member 102 as shown in
Rollers, a low friction coating or other material or structure on the T member of the fastener would allow the fastener to slide on the serosa and thereby direct itself to a desired orientation. A roller or low friction material on the T member would also facilitate reorienting the T member to a desired orientation using a rotational drive tool as described above.
One other aspect of T-tag fastener delivery is the potential for a T member to pass proximally through the track formed by the penetrating cannula rather than rotating to be parallel to the tissue surface as desired. In many cases the connection of the T member and the stem can induce rotation of the T member. If the T member is attached to a suture tail, for example as shown in
One of the challenges when performing endoscopic suturing, stapling or other types of attachment, e.g. with T-tag fasteners, is that the tissue tends to move away from the attachment device. A separate grasper can be inserted through an instrument lumen in the endoscope for holding the tissue, but this approach has its drawbacks because it is very difficult to achieve a good cooperation between the two instruments. To facilitate endoscopic attachment methods, a better cooperation can be achieved when an attachment device is combined with or otherwise mechanically linked to a grasper.
In one embodiment shown in
In another embodiment shown in
In another embodiment shown in
The combined instrument 400 is introduced endoscopically and the distal end is maneuvered into contact with the tissue to be attached. The grasper 416 is actuated to hold the tissue and the attachment device 408 is passed through the lumen to deliver a suture needle or fastener into or through the tissue. Because the grasper 416 and the attachment device 408 are so closely linked, the tissue cannot move out of the way of the attachment device 408, allowing the suture or fastener to be delivered through the tissue reliably and efficiently.
Alternatively or in addition, a vacuum coupling cuff on the distal tip of the endoscope including at least one radially outwardly directed cavity in communication via a vacuum lumen with a vacuum source can be used to allow vacuum holding of the tissue during attachment.
In some applications of the T-tag fastener, it will be advantageous to provide different configurations for the T member(s).
Expandable or swellable T members also have advantages for greater anchoring force and/or reduced pressure on the tissues where they are attached. A T member could be configured of a material that is initially small and/or soft for insertion of the T members. After insertion, the T member would expand or swell and then harden in the expanded configuration. This could result from a chemical reaction that is initiated by absorption of water or another reactant. A reagent in the material of the T member or added to it after insertion could initiate or catalyze the reaction of a hardenable material, e.g. a cyanoacrylate adhesive. Various materials and configurations for this function are described in the parent application Ser. No. 10/698,148.
Other enhancements can be applied to the T-tag fasteners described herein and those described in the parent application Ser. No. 10/698,148 and provisional 60/613,917. For example, the T member of the T-tag fastener can be configured to minimize pressure concentrations on the tissue. When applied by direct insertion, the T member of the T-tag fastener can be configured to distribute forces over a larger surface area. For example, the T member can be configured as a disk, square, rectangle or other shape with a large surface area. For blind insertion, the T member of the T-tag fastener can be configured to expand after insertion through the tissue to distribute forces over a larger area. For example, the T member can expand to form a disk, square, rectangle, I, X, Y or other configuration with a large surface area, as described herein (e.g.
All or a portion of the fastener can be coated and/or made with a material that will encourage tissue ingrowth to create a seal and to promote a strong and durable attachment. All or a portion of the fastener can be coated and/or made with a swellable material to create a seal and/or to spread out the force of attachment over a greater surface area, thereby reducing the pressure on the tissue. All or a portion of the fastener can be coated and/or made with a material that is biodegradable or bioresorbable. Examples of such coatings materials are described in the parent application Ser. No. 10/698,148.
In some of the examples herein and in the prior application, the T-tag fasteners are placed transmurally or through a full thickness plication. In an alternate method, an intramural T-tag can be placed submucosally, preferably in the serosa, where the T member would anchor the suture. The T would have a structure that is all or partly biodegradable. In this way, for those applications in which the sleeve device is intended to be removed after a sufficient amount of time depending on the needs of a particular patient, all or part of the T would degrade after removal of the sleeve device. Alternatively, the tension elements of the T-tags can be clipped off.
Following are descriptions of attachment devices and other means for securing an implantable device within the gastrointestinal system. The implantable devices and/or attachment means can be configured to avoid causing excessive pressure within the tissue by having compliance that is compatible with the gastrointestinal tissues where it is attached. Device compliance can also be important for providing a leak free seal between an implanted device and the tissue at the attachment point. Compliance can be provided in the radial or circumferential direction and/or in the vertical, axial or longitudinal direction. The device may have different compliance in different regions to be compatible with the tissue at the attachment point and at other portions of the gastrointestinal tract through which it runs. The device may have different compliance in different directions to be compatible with the tissue at the attachment point while simultaneously achieving other goals of the device. Compliance can be provided in a number of different ways. One way is by elastic or plastic deformation of the device and/or the attachment means. Another way is by a mechanical decoupling that allows relative movement between the device and the attachment points, and/or between the attachment points themselves, without transmitting excessive force or pressure to the tissue.
In some clinical situations, it will be desirable to match compliance between the device and the tissue to which it is attached. In other situations, based upon the clinical situations, it will be desirable to provide a device with higher or lower compliance than the tissue to achieve certain objectives. For example, maintaining the position of the proximal end of an attached sleeve device will require a device that is relatively noncompliant in at least the axial direction.
The implantable devices and/or attachment means described herein can utilize one or more of the following features to modify the compliance:
1) Highly-elastic materials (large amounts of stretch with low forces)
- a) Composite structures with elastic or super-elastic portions
2) Pleated materials (minimal force until pleats straighten)
- a) Similarly, other types of loose (gathered) or hanging (e.g. dangling sutures) connections
3) Fenestrated structures (e.g. cuts or slits)
- a) Can optionally use slidable overlapping elements to reduce/eliminate leaks at the slits
4) Stretchable weaves or knits
- a) Cylindrical and/or flat (e.g. an expandable or self-expanding stent or fabric)
5) Elastic, hinged and/or slotted structures that allow relative motion of components
- a) Can also use overlapping for leak control
6) Isolated or independent attachments
- a) Attachments to the GI tissue that are not connected
- i) They can initially be isolated and later connected
- ii) They could be interfaced with another device in a manner that does not restrict their relative motion (e.g. long hanging tethers)
- a) Attachments to the GI tissue that are not connected
7) Combinations of the above
Other features may be incorporated in such structures such as:
1) Reinforcement at attachment points
- a) e.g. incorporation of fabric in a molded elastic structure
2) Clips, hangers or other means for sleeve interface at individual points
- a) For both isolated coupled and decoupled interfaces
3) Materials that encourage ingrowth and/or overgrowth
4) Separation of the functions of attachment and sealing
- a) To allow greater compliance at the attachment without increasing leakage
5) Means to maintain a substantially constant restricted volume within and between the device and stomach.
6) Through control of the degree and direction of device compliance.
Certain methods for the use of such structures include:
1) Treating the tissue at the GEJ to eliminate or minimize distention
- a) Creation of fibrotic or scar tissue
- i) Chemical, RF or other energy
- ii) Permanent or temporary to allow healing/seasoning of the attachment
- b) Thereby reducing the requirement for a compliant cuff or other attachment
- a) Creation of fibrotic or scar tissue
2) Treating the tissue at the GEJ to increase tissue strength
- a) Creation of fibrotic or scar tissue
3) Allowing time for a primary attachment to heal before implantation and attachment of one or more secondary devices e.g. a sleeve.
Preferably, the attachment cuff 260 is compliant in the radial direction so that expansion and contraction of the stomach and esophagus due to contents and/or muscular action will not place additional, or actually reduce, stress on the attachment points. An elastomeric material, such as silicone or polyurethane that provides approximately 150% or more stretch in the radial direction is preferred. At the same time, the attachment ring can have enough lateral rigidity to act as a mounting platform for the gastrointestinal sleeve device and to resist downward movement due to the weight of the gastrointestinal sleeve device and its contents and peristaltic traction on the sleeve. The lateral rigidity of the attachment ring can be enhanced with radially oriented bending reinforcements, such as ribs or embedded reinforcement members. Alternatively, the attachment cuff can be flexible and compliant and other means such as hooks, sutures staples, etc., can be used for sleeve attachment.
Another strategy for avoiding excessive pressure on the gastric wall at the attachment points is to reduce the weight that the device attachment must support. This can be accomplished with spiral or longitudinal reinforcement members and/or inflatable balloons for structural support, particularly in the gastric portion of the gastrointestinal sleeve device, as described in the prior application. These features will help to transfer some of the weight to other structures of the stomach such as the antrum or the pylorus and will reduce the tension on the attachment at the GEJ. Likewise, additional attachments points at other points in the stomach will help to reduce the tension on the attachment at the GEJ. Attachment at the pylorus or other points in the stomach will also provide an added measure of safety. If the primary attachment at the proximal end of a sleeve device ever came unfastened, these additional attachment points would prevent the sleeve device from passing through the pylorus and becoming lodged in the intestine.
Another strategy for avoiding excessive pressure on the gastric wall at the attachment points is to provide an axially "floating" attachment for the gastrointestinal sleeve device so that stress transferred to the esophageal or gastric walls can be minimized or controlled. For example,
An alternate means of implementing an axial floating attachment uses vertically mounted isolated sliding attachment members can be used as an attachment structure for an implanted device. FIGS. 57A and 58A-58C show an example of vertically mounted isolated sliding attachment members 340 in a patient's stomach. This allows a maximum of relative motion between attachments with a minimum of force resisting that motion. The sliding vertical attachment allows vertical motion similar to that achieved with the floating attachment shown in
Once the attachment members 340 have been fastened to the stomach wall, the implantable device 120 is connected to them using a like number of sliding connectors 341 attached to the implantable device 120. The sliding connectors 341 are configured to allow vertical movement of the implantable device 120 with respect to the attachment members 340 and the stomach wall. Stops or detents may be included to limit the vertical movement of the implantable device 120. In the example shown, the sliding connectors 341 are configured as channels that are slidably connected to rail-shaped attachment members 340. Other configurations of attachment members 340 and sliding connectors 341 are also possible.
The use of isolated attachments to attach a sleeve within the GI tract has been previously disclosed herein and in parent application Ser. No. 10/698,148. Isolated attachment allows a maximum of relative motion between attachments with a minimum of force resisting that motion. As has been discussed, the attachments can be left in place for a time to heal and become secure prior to the attachment of a sleeve. This concept can be extended to the use of a cuff, which interfaces a replaceable sleeve with GI tissue. Isolated attachments can be placed in the GI tissue, a period of time can allow healing of these attachment points and then the reusable cuff can be fastened to the GI tissue using the previously placed isolated attachments.
The attachment device 450 is passed through the esophagus and attached to the stomach wall, preferably near the GEJ. The attachment device may include a sewing ring or other features, such as those described herein, to facilitate attachment to a plication or directly to the unplicated stomach wall. The gastrointestinal sleeve device 458 is then passed through the esophagus and into the stomach and intestine. The upper flange 456 on the sleeve device 458 is held by the lower flange 454 of the attachment device 450. Optionally, the upper flange 456 on the sleeve device 458 may have a sliding fit with the cylindrical outer wall 452 to allow for relative motion between the sleeve device 458 and the attachment device 450, with the lower flange 454 on the attachment device 450 serving to limit the downward motion of the sleeve device 458. The sliding fit will help to reduce the tension transferred to the gastric wall from the sleeve device 458 and the weight of its contents.
In general, a first retention surface such as an upwardly facing surface on a radially inwardly facing flange or plurality of tabs on the attachment device (cuff) 450 limits distal movement of the sleeve by contacting a second retention surface on the sleeve. The second retention surface may be a downwardly (distally) facing surface such as the distal surface of a radially outwardly facing annular flange or plurality of tabs on the proximal end of the sleeve. In this configuration, the sleeve may be passed through the cuff and simply "dropped" into place and the first and second retention surfaces limit further distal travel of the sleeve relative to the cuff.
Alternatively, the attachment device may include an interlock or snap fit structure for capturing the upper flange of the sleeve device to reduce or eliminate relative motion between the sleeve device and the attachment device in either the proximal or distal direction.
In other variations of these embodiments, the cylindrical walls can taper inward for attaching an implant device with a smaller diameter than the attachment device or they can taper outward for attaching an implant device with a larger diameter than the attachment device.
Each of these embodiments permits the sleeve to be dropped into place or snap fit into place by elastic or other deformation of the interlocking retention surfaces. The attachment can be made more secure by the addition of one or two or more staples, stitches of suture or t-tags. Removal can be accomplished using a removal tool with a stop surface for placing against a surface on the cuff to prevent proximal movement of the cuff, and a grasper for grasping the proximal end of the sleeve and pulling the sleeve to release it from the cuff without straining the connection between the cuff and the tissue. Any additional sutures can be snipped using conventional endoscopic cutting tools. The cuff may also be removed if desired, or a different sleeve may be introduced and secured to the cuff.
The flexible cylindrical attachment device 480 can be constructed from a number of materials and methods. By way of example,
In some clinical circumstances, it may be desirable to implant a treatment device that is larger than the attachment means.
Alternatively, the attachment device can provide only a mechanical attachment and the gastrointestinal sleeve device can provide a seal against the gastric wall or a separate sealing device may be provided. In this case, instead of an impermeable skirt, the attachment device may have a suspension frame that provides a mechanical attachment between the attachment ring and the gastrointestinal sleeve device. The suspension frame may be made, for example, from wires or mesh or filaments that provide the necessary mechanical strength, but do not provide a seal. The skirt portion of the attachment device may also be constructed with an impermeable membrane over a suspension frame of this type. Optionally, the suspension frame may include adjustable length tethers for adjusting the distance between the attachment ring and the gastrointestinal sleeve device.
Preferably, the entire structure of the attachment device 420 is collapsible and expandable so that it can be easily passed through the esophagus in a folded, compressed or collapsed state and re-expanded once it is in the patient's stomach. Optionally, the final expanded diameter may be adjustable. Optionally the device 420 may be highly compliant and stretchable where it is attached to the gastric wall.
Although this example shows the implanted device mounted downstream or below the attachment device, in some clinical situations it may be desirable to mount an implant device so that it protrudes above the attachment device.
External Sleeve Interface
With (1) a device system where a primary attachment such as a cuff is placed in a tubular duct, e.g. at the GEJ, and a secondary device such as a gastrointestinal sleeve is removably attached to the primary attachment device and (2) placement of the system with a coaxial procedure, e.g. an endoscope passed down the esophagus, placement of the secondary device within the lumen of the primary device can be a simpler approach. However, certain advantages could be obtained if the secondary device were mounted on the exterior of the primary device. Various sleeve geometries with the sleeve portion of the interface being smaller diameter and internally coaxial to the cuff have been previously described.
All of the configurations can be inverted such that the sleeve is of larger diameter and external to the cuff. Similarly, other interface designs such as hooks and eyes disclosed herein can be configured with the sleeve of a larger diameter than the primary mounting cuff.
If the proximal portion of the sleeve 552 were less compliant than the distal portion of the cuff 550, internal pressure would press the wall of the cuff 550 into sealing contact with the sleeve 552. In this situation, the seal will be maintained so long as the sleeve 552 stretches less than the cuff 550 as internal pressure increases. Also the distance the cuff 550 and the sleeve 552 overlap can be adjusted to improve interface performance related to leak resistance and/or retention strength. This system can also allow holes or perforations in either the cuff or sleeve in the region of overlap of an unperforated surface without allowing leaks. These holes or perforations may be used to attach the components. The sleeve 552 is removably connected to the cuff 550. Alternate removable connections between the sleeve 552 and the cuff 550, such as stitching, stapling, T-tags, hooks and loops including Velcro, magnetic interfacing structures, adhesives, friction interfitting structures, and various other complementary interfitting structures, depending on the desired performance, are contemplated.
Separation of Attachment and Sealing
The functions of attachment and sealing can be separated, for example highly compliant attachment can be placed at the GEJ and a sealing connection can be placed upstream towards the esophagus. The compliant attachment can be accomplished with gathered or pleated stretchable material. The sealing connection can be configured similar to a covered expandable or self-expanding stent. These separate structures can be improved by structure (e.g. one or more vertical bellows-like pleats) that would allow relative vertical displacement of the sealing and attachment zones.
Distal Compliance
Similarly, the restrictive component of a morbid obesity treatment system has usually been depicted as being at or distal to the attachment point of the device. Since restrictions may be most effective when coupled with a constant or restricted volume proximal to the restriction this suggests that little or no compliance would be preferred at the attachment. Alternatively, the compliance of the attachment can be factored into the definition of the restricted volume. In some clinical situations where high compliance is desirable it could be preferable for the restricted outlet of the restricted volume be placed proximal to a compliant attachment e.g. attachment 562 in
Compliant attachment means can be used at or near the GEJ or cardia of the stomach. These attachments can be connected to a restrictive component, which is maintained in a sealing connection with the walls of the GI tract proximal to the attachment. The means used to connect the restrictive component (a device that has a restrictive opening and seals with the walls of the GI tract) do not need to be impervious to masticated food. Sealing means can be passive (for example, an oversized device in a relatively smaller tubular duct) or active (for example, suture, anchor, staple, etc.) However, this sealing is not the primary attachment. It is merely to maintain a seal while the primary compliant attachment resists other forces.
Tissue Prestrengthening
In some clinical situations the gastroesophageal junction, or GEJ, is a preferred attachment point for a gastroesophageal sleeve device or attachment device as discussed above. Attachment at the GEJ excludes all gastric secretions from the interior of the gastrointestinal sleeve device to separate ingested food and liquids in the sleeve device from all digestive secretions. The gastroesophageal junction is one of the preferred attachment sites because the tissue wall is relatively thick at this location and it is relatively easy to access via a peroral route. More specifically, the non-glandular tissue directly above the squamo-columnar junction (a zone of tissue that is considered to be at the beginning of the GEJ) is the strongest tissue in this region and is currently thought to be the best place to attach a device, for example using T-tags, sutures or other fasteners.
In some clinical situations it may be beneficial to prestrengthen the tissue prior to implantation of a device such as a gastrointestinal sleeve device. For example, energy can be delivered in the form of RF, ultrasound or other known method to induce an inflammatory, coagulative or necrotic tissue strengthening reaction. Alternatively, placement of material in the serosal tissue of the stomach wall could generate a foreign body reaction that would progress from inflammation, to granulation of tissue and then to fibrosis. The tissue may initially weaken due to the inflammatory response, but the resulting fibrotic growth will strengthen the tissue. This effect could be enhanced by the choice of material an/or coatings, e.g. sclerosing agent, an acidic material or coating. The materials could be delivered endoscopically with a needle device through the biopsy channel of an endoscope. The needle delivery device could optionally also deliver an ink, dye or other marking means to facilitate location of the prestrengthened areas. Tissue reaction could take place in days, with 7-14 days being an approximate delay between prestrengthening and attachment procedures.
Material injectable to prestrengthen tissue could be: 1) liquid where natural processes would remove/break down or otherwise dispose of the liquid when it has completed its function; 2) biodegradable or dissolvable where natural processes would remove the material when it has completed its function; or 3) permanent where the material might be incorporated into the tissue to provide increased strength. All of the prestrengthening strategies described could be used at the time of the attachment procedure to enhance strength of the attachment.
The methods and apparatus described for tissue strengthening would be expected to result in some degree of tissue thickening as new collagen and fibrotic material will be deposited and/or generated at the location of the foreign body reaction. The duration of exposure can be controlled by use of timed release chemical stimulants and stimulants with known and potentially controllable half lives. Tissue thickening and tissue strength may be related and may facilitate durable attachment, however tissue thickening may be an inherently desirable result in some clinical situations.
Currently, tissue bulking agents are injected at or near the GEJ to treat GERD. Injection of non-bulking materials that initiate tissue thickening could accomplish the same end result. If the thickened tissue was, by itself or in conjunction with a supporting structure, to form a restrictive stoma, there could be specific advantages relative to a mechanical stoma.
Tissue prestrengthening and/or thickening can be accomplished by inserting a fibrosis inducing agent with a suture tail attached to it. The fibrosis inducing agent will preferably also act as a scaffold for strength. The tail will allow easy identification of the location that has been strengthened for retrieval or guidance of follow on attachment procedures. Once tissue has strengthened, cuff and sleeve can be placed in a single combined procedure as the prestrengthened tissue will not require additional healing time to hold.
Other approaches to induce tissue prestrengthening and/or thickening include: Circumferential ablation (RF, microwave, ultrasound, etc); Over-dilation; Circumferential abrasion; and, Circumferential exposure to agent. An advantage of a circumferential area of tissue strengthening is that it only needs to be located along a vertical axis for subsequent attachment procedures.
Alternately or in addition to the above pre-strengthening of tissue, tissue can be treated to reduce its ability to move or stretch. This can be advantageous in that tissue that has limited stretch or motion may have less impediments to attachment. Tissue that has limited stretch or motion may impose fewer forces on an attached device and therefore impose less pressure that may lead to attachment failure. Furthermore, tissue that has limited stretch or motion may allow attachment of less compliant devices which can provide for advantages foe example simplified sealing.
Techniques described above to strengthen tissue can also help to limited GI tissue stretch and motion. Other methods that could be applied to reducing stretch and motion, and also for pre-strengthening, include the application of energy for example, by RF, ultrasound or laser. Means that include time release elements as well known in the art of drug eluting vascular stents and birth control devices can be used to provide and/or maintain a long lasting effect (reducing motion and stretch). Such time release means can optionally be combined with fasteners, permanent or replaceable attachment cuffs or proximal sleeve interfaces. Such time release means can optionally be combined with permanently implanted pre-strengthening materials where the material might be incorporated into the tissue to provide increased strength.
Suture Lengthening
In some clinical situations when using a transmural attachment, the wall of tissue may thicken after placement of the attaching device.
In some clinical situations it can be advantageous to maintain the attachment on the surface of the tissue to take advantage of the added strength of the thickened wall.
One configuration of material that could have advantageous performance would: 1) not stretch for an initial period, for example 24-48 hours; 2) stretch at a relatively low force for the next period, for example 7-14 days; then 3) not stretch after the second period. This performance would be based upon a clinical situation where tissue proliferation (wall thickening) occurs between days 2 and 14. Alternatively, the material could: 1) not stretch for the initial period, for example 24-48 hours; 2) allow lengthening to 2× length at any time after the initial period, for example 48 hours; then 3) not stretch beyond 2× length.
A portion of the suture 522 is folded at least about 2× or 3× as shown in
Lengthening could also be accomplished with a coaxial system.
The principle of shortening/lengthening of a braided mesh can be applied to an automatically lengthening suture.
An optimized yielding suture system for GI attachment could have differing responses to short impulse and long continuous loads. Viscoelastic polymer systems such as Tempurfoam resist short term impulse loads and yield to slow steady long term loads. Resistance to short term loads and yielding to long term loads could be advantageous in clinical situations where there can be temporary short term loading due to overeating while yielding to long term loads could relieve overpressurization of tissue to enable tissue perfusion to avoid tissue necrosis due to pressure and/or ischemia.
In other clinical situations yielding to short term transient loads may facilitate secure attachment when coughing, retching, swallowing etc. occur. Resistance and/or recovery in the face of lower and slower forces can return the suture to a normal length, facilitating leak free securing of an attachment.
Yield points and/or recovery points should be selected so attachment forces do not exceed the acute pull out force of a suture and/or T-tag. Acute pull out forces can be in the range of 3-9 pounds depending on the suture/T-tag configuration. This is of particular concern for short term impulse loads. Loads applied over longer periods should be selected to avoid ischemia and/or pressure necrosis. These forces can be very low and can be less than 1 pound.
In an ideal situation, a suture system will recover to a set length which results in no force applied to the tissue over extended periods of time. Attachment can resist forces between necrosis force/pressure if they are transient and allow tissue time for healing and/or recovery. A system whereby recovery after yielding occurs in a non-continuous manner thereby allowing tissue healing and/or recovery could be desirable in many clinical situations. This may be accomplished by materials that respond to outside stimulus (e.g. electrical, chemical, magnetic, etc.) that can be applied intermittently.
The length of the suture or other tension element which extends through the wall from the serosal surface to the mucosal surface, particularly when the tension element has a substantially fixed length under normal use conditions may also be important. The present inventors believe that the length of the tension element is in certain applications at least about 75%, often at least about 100%, and preferably at least about 120% and possibly at least about 130% of the thickness of the wall of the stomach through which the tension element is to be placed. Thus, for a patient having a wall thickness in the vicinity of the gastroesophageal junction of approximately 10-15 mm, suture lengths between the mucosal contacting surface of the implant and the serosal contacting surface of the retention element of at least about 10 mm, and often at least about 15 mm are contemplated.
The stomach appears to have unusual abilities to isolate foreign objects. Evidence of this is the lap band which can migrate from the serosal surface of the stomach into the lumen of the stomach without any immediate catastrophic event such as a leak of stomach contents into the body cavity which could be life threatening. The cause of such erosion is unclear but one theory suggests it is at least in part due to pressure.
The stomach is also a very active organ with an ability to stretch, compress, churn and move laterally relative to itself. This activity is normal in eating and digestion and can also function to isolate foreign objects.
These anatomical aspects make attachment of medical devices to the stomach quite challenging. A recent study at the Cleveland Clinic which sutured a prosthetic cuff to the GEJ showed that by 7 days 80% of the cuffs had become primarily detached. In one animal that was survived for two months, the device remained attached at 4 weeks but was only 25% attached by 60 days.
The present inventors have conducted a series of studies to explore the parameters of a successful attachment. Initial designs utilizing rigid rings lost attachment at a majority of points within four weeks.
Short term success at two weeks with a flexible cuff, with elastic ability, was achieved by using t-tags and placing them in the non-glandular tissue region of the GEJ.
However this same technique at five weeks did not maintain 100% attachment. One-Third of the attachment points migrated through the stomach, leaving no identified histological evidence of their path. The t-tags did not appear to be deformed.
The inventors then undertook a series of experiments at five weeks controlling for the amount of tension on the tension element, by placing serosal surface attachment devices having tension elements with a predetermined length relative to the thickness of the tissue wall. The thickness of the porcine stomach at the target site was measured, and the average of four tissue thickness measurements at the 3-6-9-12 o'clock positions was used as the nominal thickness. The absolute thickness was somewhat surprising at around 1 cm. This was perceived to be much thicker than what was thought. The reasons for this could be increased thickness in the area of interest of the GEJ, but it could also be due to the highly compressible nature of stomach tissue in that when it is held between the thumb and index finger it does feel 1 cm thick.
In three experiments conducted there was a clear trend that the looser the attachment (i.e., the longer the length of the tension element compared to the local wall thickness) the more attachment points held at five weeks. Results ranged from 10/12 migrations for the sutures sized at 50% of nominal thickness to 2/12 migrations for sutures sized at 100% of nominal thickness.
Another variable which was explored in the porcine model was the effect of changes in the surface area of the retention element. Silicone buttons having a 1 cm diameter were used instead of the t-tags. In one experiment conducted to date at a suture length of 75% of nominal thickness, 4/12 silicone buttons migrated through.
What seemed different about the silicone buttons is with two-thirds of the attachments in place it appeared upon gross inspection to be very strongly functionally attached, with high weight bearing abilities, perceptually greater than the t-tags.
From the experiments to date it appears that tension control is as important (if not more so) as the geometry of the serosal attachment device.
As discussed elsewhere herein, tension control could be addressed by using suture with limited elastic properties or other structural mechanism that would stretch or elongate and then return to their nominal length. Another way is to use an assumed thickness, based upon an average of actual measurements in humans, and preset the length of the tension element at a predetermined length (e.g., at least 115%, at least 130%) compared to the length of the average. The chances of success for this approach would likely be enhanced if the patient to patient variation is relatively small. A further approach would be to measure the thickness of the target tissue in each patient, and customize the length of the tension element at the clinical site, or provide kits with a cuff and an array of anchor assemblies with tension elements of different predetermined lengths from which the clinician can make a selection. Measurement could be accomplished, for example, with endoscopic ultrasound, like a device available from Boston Scientific.
Once the measurement is taken a variety of devices could be used to attach with a controlled length. Many of these devices have been previously described and include t-tags, inflatable silicone discs, molly type devices, radial spoke "umbrella" structures and others. They can be attached to suture with a fixed cuff to retention element length (or other means) or a strut member made of polymer or metal with a nub to fix the length. All of these devices are preferably configured to permit endoscopic delivery through a single fire device, or a multiple fire or rapid reloadable device could be used, to minimize the number of times the delivery device needs to removed from the endoscope to be reloaded.
In order to facilitate holding the cuff in place while attaching, the cuff could come preloaded on a radially expanding support structure that can be removed following implantation. Or it could be held in place by a deflectable alligator clip or other grasping device that would hold the cuff against the GEJ at the target site.
U.S. patent application Ser. No. 10/698,148 describes gastric and gastrointestinal sleeve devices that include inflatable balloons for structural support of the sleeve and/or for enhancing the patient's feeling of satiety. An enhanced method of using these devices is to inflate the balloons with a fluid containing a nontoxic detectable dye, such as methylene blue. If any of the inflatable balloon members should develop a leak, the methylene blue will be passed in the urine and be detectable by the patient. The patient should then contact a physician to determine whether repair or replacement of the device is indicated.
Another concept described in the application Ser. No. 10/698,148 involves the placement of a mounting ring or other attachment device within the gastrointestinal system and attaching various other devices or components to the attachment device. Enhancements to that concept for treating GERD, MO and other disorders of the gastrointestinal tract could include placing/attaching a nonrestrictive mounting ring at or near the GEJ and attaching/removing/replacing various therapeutic or diagnostic devices to the mounting ring, such as a valve to prevent reflux, a restriction to food intake, a sleeve, a telemetry or imaging capsule, etc.
While the present invention has been described herein with respect to the exemplary embodiments and the best mode for practicing the invention, it will be apparent to one of ordinary skill in the art that many modifications, improvements and subcombinations of the various embodiments, adaptations and variations can be made to the invention without departing from the spirit and scope thereof.
1. An attachment system for attaching a device to the mucosal side of a wall of the gastrointestinal tract, the wall comprising a muscularis layer and a serosal layer, the system comprising:
- a gastrointestinal attachment cuff having a tubular body, a proximal end and a distal end;
- at least one tissue anchor for transmural attachment of the cuff to the mucosal side, the anchor comprising a tension element having a proximal end and a distal end for extending through the wall and at least one transverse retention surface configured for positioning in contact with serosal tissue, wherein the retention surface is attached near the distal end of the tension element, wherein the retention surface is transformable from a first, transversely reduced profile to a second, transversely enlarged profile;
- a gastric bypass tube for connection to the cuff, the bypass tube having a length of at least about 50 cm; and
- a first coupler on the attachment cuff configured for removably coupling to a second, complementary coupler on the gastric bypass tube.
2. An attachment system as in claim 1, wherein the tension element comprises suture.
3. An attachment system as in claim 1, wherein the tension element comprises a proximal end for extending through the mucosal layer and a distal end for carrying the transverse retention surface, wherein the transverse retention surface comprises a proximal surface of a serosal anchor.
4. An attachment system as in claim 3, wherein the serosal anchor comprises a T-tag.
5. An attachment system as in claim 3, wherein the serosal anchor comprises a disc.
6. An attachment system as in claim 3, wherein the serosal anchor is inflatable.
7. An attachment system as in claim 3, wherein the tension element has a length between the cuff and the transverse retention surface, and the length is from about 2 mm to about 6 mm.
8. An attachment system as in claim 3, wherein the tension element has a length between the cuff and the transverse retention surface, and the length is at least about 10 mm.
9. An attachment system as in claim 1, comprising at least six tissue anchors.
10. An attachment system as in claim 1, comprising at least ten tissue anchors.
11. An attachment system as in claim 1, wherein the tension element comprises a first material and the transverse retention surface comprises a second, different material.
12. An attachment system as in claim 1, wherein the at least one transverse retention surface comprises a first transverse retention surface extending in a first generally transverse direction with respect to a longitudinal axis of the tension element and a second transverse retention surface extending in a second generally transverse direction with respect to the longitudinal axis of the tension element after passing transmurally through the wall.
13. An attachment system as in claim 1, wherein the cuff comprises a lumen for passage of ingested contents therethrough, wherein the lumen has a diameter at the proximal end of the cuff that is substantially similar to a luminal diameter at the distal end of the cuff.
14. An attachment system as in claim 1, wherein the tension element is flexible.
15. An attachment system as in claim 1, wherein the first coupler comprises a retention surface of the cuff and the second coupler comprises a retention surface of the bypass tube.
16. An attachment system as in claim 15, wherein the retention surface of the cuff is a radially inwardly-extending surface and the retention surface of the bypass tube is a radially outwardly-extending surface.
17. An attachment system as in claim 16, wherein the inwardly-extending surface is an inwardly-extending lip.
18. An attachment system as in claim 1, wherein the first coupler interlocks with the second coupler with an overlapping interference fit.
19. An attachment system as in claim 1, wherein at least one of the first coupler and the second coupler comprises a hook.
20. An attachment system as in claim 1, wherein the first coupler forms a friction fit with the second coupler.
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Patent History
Type: Grant
Filed: May 9, 2006
Date of Patent: Feb 22, 2011
Patent Publication Number: 20060206063
Assignee: ValenTx, Inc. (Carpinteria, CA)
Inventors: Jonathan Kagan (Hopkins, MN), Mitchell Dann (Wilson, WY), Lee Guterman (Amherst, NY), Joshua Butters (Chandler, AZ), Paul Swain (London)
Primary Examiner: Kevin C. Sirmons
Assistant Examiner: Phillip Gray
Attorney: Knobbe, Martens, Olson & Bear LLP
Application Number: 11/430,677
International Classification: A61M 5/00 (20060101);