Ambulatory infusion pump

Details Ambulatory infusion pump Ambulatory infusion pump

1991-01-17

1992-03-31

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604246, A61M 520

Patent

active

051003899

ABSTRACT:
The ambulatory infusion pump is provided with a preloaded spring having a fixed spring constant. A tab is provided to release the preloaded spring to impose a biasing force on the piston of the pump. The piston slides within the housing against a substantially constant friction force when moving from the filled position toward the empty position. The biasing force of the spring and the stroke of the piston are coordinated so as to maintain a pressure on the fluid being dispensed from the pump housing which decreases at a slow rate and within a range of about 15% of the referenced pressure.

REFERENCES:
patent: 1633293 (1927-06-01), Smiley
patent: 1835122 (1931-12-01), Thevenot
patent: 2221739 (1939-10-01), Reiter
patent: 2590138 (1952-03-01), Willis
patent: 2954767 (1957-12-01), Rane
patent: 3245591 (1966-04-01), Kneusel et al.
patent: 3334788 (1967-08-01), Hamilton
patent: 3451393 (1969-01-01), Sarnoff
patent: 3831602 (1974-08-01), Broadwin
patent: 4400277 (1983-08-01), Leason
patent: 4813937 (1989-03-01), Vaillancourt
patent: 4874386 (1989-10-01), O'Boyle

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