A restriction system, such as an adjustable gastric band, for forming a restriction in a patient and non-invasively communicating pressure data regarding the restriction to an external monitor. The system includes a restriction device for implantation in a patient to form a restriction. The system further...http://www.google.ca/patents/US7699770?utm_source=gb-gplus-sharePatent US7699770 - Device for non-invasive measurement of fluid pressure in an adjustable restriction device
