| 摘要 |
<p>Apparatus and methods are provided comprising an implantable non-hydraulic ring (22) that encircles and provides a controllable degree of constriction to an organ or duct and an external control that powers and controls operation of the ring. The ring includes a rigid dorsal periphery (30, 38) that maintains a constant exterior diameter, and a compliant constriction system (31, 36) that reduces intolerance phenomena. A high precision, energy efficient mechanical actuator (35) is employed that is telemetrically powered and controlled, and maintains the ring at a selected diameter when the device is unpowered, even for extended periods. The actuator provides a reversible degree of constriction of the organ or duct, which is readily ascertainable without the need for radiographic imaging. Methods of use and implantation also are provided.</p> |
