A drive mechanism for delivery of infusion medium a coil capable of being electrically activated to provide an electromagnetic field. The coil surrounds a piston channel extending in an axial direction. The piston channel provides a passage for communication of infusion medium to an outlet chamber located...http://www.google.de/patents/US20030135160?utm_source=gb-gplus-sharePatent US20030135160 - Infusion device and driving mechanism for same
