Programmable valve pump

Details Programmable valve pump Programmable valve pump

1990-04-25

1991-09-17

Stone, Cary E.

Surgery

Controlled release therapeutic device or system

Implanted dynamic device or system

128DIG12, 604118, A61M 3100

Patent

active

050491415

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

REFERENCES:
patent: 4221219 (1980-09-01), Tucker
patent: 4303376 (1981-12-01), Siekmann
patent: 4515588 (1985-05-01), Amendolia
patent: 4714462 (1987-12-01), Didomenico
patent: 4838887 (1989-06-01), Idriss
patent: 4936758 (1990-06-01), Coble

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