The present invention relates to a remotely adjustable gastric banding system comprising: a gastric band a reservoir for holding a fluid for filling and draining the gastric band flexible tubing connecting the reservoir to the gastric band a sensor module positioned between the gastric band and the reservoir, the sensor module comprising: a first inlet a second inlet a first flow meter coupled to the first inlet a second flow meter coupled to the second inlet and a calibrated orifice disposed between the first flow meter and the second flow meter, the fluid flowing from the first inlet to the second inlet when filling the gastric band, the fluid flowing from the second inlet to the first inlet when draining the gastric band, the sensor module monitoring a parameter of the fluid when filling and draining the gastric band a first valve, coupled to the first inlet of the sensor module, for controlling a flow of the fluid when filling and draining the gastric band a piezoelectric pump coupled between the reservoir and the first valve, for moving the fluid into and out of the gastric band, the piezoelectric pump capable of being activated and deactivated using a telemetric signal received from a remote device, the pumping device comprising a non-magnetic electrical drive a second valve coupled in parallel with the piezoelectric pump, wherein the second valve and the piezoelectric pump are coupled to the first valve and the reservoir, wherein the first valve remains closed while the second valve is opened to allow the piezoelectric pump to stabilize before opening the first valve to facilitate filling and draining the gastric band and an access port fluidly coupled between the second flow control device and the inflatable portion of the gastric band.
