Additionally, naltrexone subcutaneous implants that are surgically implanted are available. Biocompatible microchip implants that utilize RFID technology are being routinely implanted in humans. These are surgically implanted hearing aids inserted onto the middle ear. Ectopia lentis can be treated, as artificial lenses can be surgically implanted. All three components are surgically implanted inside the body. There are interior and exposed exterior components that are surgically implanted. Eventually the magnetic pads were surgically implanted beneath the skin, giving him a normal appearance. The electrodes are implanted as described above. Initially ICDs were implanted via thoracotomy with defibrillator patches applied to the epicardium or pericardium. Engineered anal sphincters grown from stem cells have been successfully implanted in mice. A device was implanted to regulate his heart. Microchips can be implanted by a veterinarian or at a shelter. Though today these devices are implanted into small babies shortly after birth. A second device was then implanted which lasted for two days. In some cases, a human aortic valve can be implanted.