Implantable microinfusion pump system

摘要: An implantable microinfusion pump system for dis­ pensing medication at a prescribed infusion rate within the human body includes hermetically sealed housing in which power source and circuitry actuating are contained. A permanently magnetized piston is moun­ ted reciprocative fill strokes chamber defined by member which extends between parallel-spaced walls of housing. The member communicates one end with an expandable medicament reservoir adjacent wall housing, at other catheter conveying medicament to body. two stage valve arrangement causes medica­ ment to enter chamber during short duration be dispensed from prescribed longer duration strokes. To minimize current drain the driven through shorter by magnetic actuator windings through at­ traction between pole piece.