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.se/patents/US20030130647?utm_source=gb-gplus-sharePatent US20030130647 - Infusion device and driving mechanism for same
