Prototype for an implantable micropump powdered by piezoelectric disk benders

A prototype for an implantable mul pump to be used in an artificial pancreas has been constructed, in which pressure is developed by a bellows formed from 2 apposed piezoelectric disk benders connected to the high impedance secondary winding of aminiature transformer. Active valving, properly phased, is achieved by a miniature solenoid valve connected in series with the transformer primary winding and a rectangular wave generator.