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Design and Control of a Compact Endoscope Manipulator: a Biologically Inspired Approach

Laparoscopic surgery is a technique where surgical tools and a laparoscope are inserted into the patient’s body through small holes in the abdomen, and the surgeon carries out the surgery while viewing the images from the laparoscope on a TV monitor (see Fig. 1(left)). Laparoscopic surgery has grown rapidly in popularity in recent years, not only because it is less invasive and produces less visible scarring, but also because of its benefits in terms of healthcare economy, such as shorter patient stays. The most important characteristic of this technique is that the surgeon performs the operation while watching the video image from the laparoscope on a monitor instead of looking directly at the site of the operation. Thus, an important factor affecting the safety and smoothness of the operation is the way in which the video images are presented in a field of view suitable for the surgical operation. Manipulation of the laparoscope is not only needed for orienting the laparoscope towards the parts requiring surgery, but also for making fine adjustments to ensure that the field of view, viewing distance and so on are suitable for the surgical operation being performed. A camera assistant operates the laparoscope according to the surgeon’s instructions, but must also make independent decisions on how to operate the laparoscope in line with the surgeon’s intentions as the surgery progresses. Consequently even the camera assistant that operates the laparoscope must have the same level of experience in laparoscopic surgery as the surgeon. However, not many surgeons are skilled in the special techniques of laparoscopic surgery. It is therefore not uncommon for camera assistants to be inexperienced and unable to maintain a suitable field of view, thus hindering the progress of the operation. To address this problem, laparoscope manipulating robots are expected as a substitute for the human camera assistant and have already been made commercially available (see Fig. 1(right)). However, there are several problems to be solved: 1. Hardware problems: A large apparatus sometimes interferes with the surgeon. The setting and repositioning is awkward. Furthermore, the initial and maintenance costs are expensive.