A medication infusion system includes an implantable device and an external control device. The implantable device includes a constant flow pump and a flow rate that may be altered by commands received from the external control device. Power to execute the commands is also provided to the passive pump...http://www.google.ca/patents/US6589205?utm_source=gb-gplus-sharePatent US6589205 - Externally-controllable constant-flow medication delivery system
