A plurality of structures that resiliently attract one another are provided for implanting in a patient around a body tissue structure of the patient. For example, the body tissue structure may be the esophagus, and the plurality of structures may be implanted in an annulus around the outside of the...http://www.google.fr/patents/US7695427?utm_source=gb-gplus-shareBrevet US7695427 - Methods and apparatus for treating body tissue sphincters and the like
Methods and apparatus for treating body tissue sphincters and the like
