A remotely controlled gastric band system that is practically immune to external magnetic fields, such as from a Magnetic Resonance Imaging (MRI) machine, incorporates a bi-directional pump and fluid reservoir to adjust fluid volume in a gastric band. A piezoelectrically driven (e.g., rotary actuator,...http://www.google.es/patents/US7390294?utm_source=gb-gplus-sharePatente US7390294 - Piezo electrically driven bellows infuser for hydraulically controlling an adjustable gastric band
Piezo electrically driven bellows infuser for hydraulically controlling an ...
