A portable infusion pump for delivering medicine to a living body has a roller pump for infusing solutions by use of a motor, a driving circuit for driving the motor in response to a control signal, and a flow rate control for generating the control signal. The flow rate control includes a manual operating...http://www.google.ca/patents/US4840620?utm_source=gb-gplus-sharePatent US4840620 - Portable pump for infusing medicine into a living body
