Patent ID: 8758221

Claim:
An implantable device that uses potential energy to facilitate the movement of fluid to an inflatable portion of a gastric band, the implantable device comprising: a source reservoir configured for holding the fluid, the source reservoir having an elastic shell capable of contracting due to a first inward pressure; a source valve configured to be coupled between the source reservoir and the gastric band, the source valve being open or closed based on a first telemetric signal received from a remote transmitter, and when the source valve is open, the first inward pressure causes the elastic shell to contract causing a portion of the fluid in the source reservoir to move into the inflatable portion of the gastric band, and when the source valve is closed, the fluid does not move outside the source reservoir; a drain reservoir configured for storing the fluid and being coupled to the source reservoir such that a portion of the fluid is capable of moving from the drain reservoir to the source reservoir without moving through the inflatable portion of the gastric band when the source valve is open; and an override port configured for filling or draining a portion of the fluid from the inflatable portion of the gastric band or the source reservoir or the drain reservoir, wherein the first telemetric signal is an electromagnetic signal.