Reciprocating pump for an implantable medication dosage device

Details Reciprocating pump for an implantable medication dosage device Reciprocating pump for an implantable medication dosage device

1988-04-18

1989-11-28

Rosenbaum, C. Fred

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604249, 6048911, 417274, 417562, 417417, A61M 100

Patent

active

048834670

ABSTRACT:
A reciprocating pump suitable for use in an implantable medication dosage device has a piston movable in a chamber connected to a medication reservoir, the chamber having an output closable by a check valve. The check valve includes a movable element which is acted upon by a biasing system to urge the moveable element in a direction to close the check valve. The moveable element has a sealing surface against which an end face of the piston presses with tight adjacency as the piston moves to an extreme position during its output stroke.

REFERENCES:
patent: 2679353 (1954-05-01), Bernat et al.
patent: 2853229 (1958-09-01), Dolz
patent: 2954917 (1958-09-01), Bayer
patent: 3468257 (1969-09-01), Uofink
patent: 3781140 (1973-12-01), Gladden
patent: 4543989 (1985-10-01), Lorson
patent: 4568250 (1986-02-01), Falk et al.

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