Programmable valve pump

Details Programmable valve pump Programmable valve pump

A - Human Necessities

61

M

A61M 5/172 (2006.01) A61M 5/142 (2006.01) F04B 43/04 (2006.01)

Patent

CA 2078212

An implantable valve accumulator pump for the delivery of medication is disclosed. The implantable pump comprises a drug reservoir (18) maintained at constant pressure vapor. The medication metering assembly comprises a fixed volume accumu- lator (30) positioned between a pair of valves (26, 28). The valves (26, 28) alternately open and close to admit medication from the reservoir (18) into the accumulator (30) and to dispense a precise volume spike to an outlet catheter (36). In order to minimize dead volume and insure complete discharge, the accumulator (30) employs a titanium diaphragm (90) seated in one position by a recessed stop (92) and in the discharge position by a spacer plate (98) having a concentric groove pattern (106). The grooves (106) are in fluid communication with the inlet and outlet (58, 59). Also, a wide groove (105) extending between inlet and outlet (58, 59) provides fluid communication between the grooves (106). The unit is externally programmed.

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