An implantable restriction device is configured to provide a restriction in a patient as a function of the pressure of fluid. The implantable restriction device includes one or more pressure sensors configured to sense pressure of the fluid within the implantable restriction device. Pressure data obtained...http://www.google.co.uk/patents/US20060211913?utm_source=gb-gplus-sharePatent US20060211913 - Non-invasive pressure measurement in a fluid adjustable restrictive device
