Infusion pump

Details Infusion pump Infusion pump

1986-06-17

1988-05-17

Pellegrino, Stephen C.

Surgery

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

Treating material introduced into or removed from body...

604246, 121DIG12, A61M 500

Patent

active

047447869

ABSTRACT:
The infusion pump delivers liquid to a body at an adjustably controlled rate of delivery. The pump comprises a syringe section including a syringe barrel having a nozzle at one end. A syringe piston has an inner end situated in the syringe barrel and an outer end extending out of the other end of the syringe barrel. A drive mechanism comprising a generally cylindrical housing has one end mounted to the other end of the syringe barrel. The outer end of the piston extends into the one end of the housing. A gas spring is situated at the other end of the housing and a dampening/timing mechanism is positioned between the gas spring and the outer end of the syringe piston. The dampening/timing mechanism includes a viscous fluid which is movable through a passageway in the housing from a space adjacent the gas spring to a space above the piston. A control mechanism is provided for altering the flow rate of the viscous fluid through the passageway and between the spaces.

REFERENCES:
patent: 2017276 (1935-10-01), Erickson
patent: 2168437 (1939-08-01), Buercklin
patent: 2545017 (1951-03-01), Billingsley
patent: 3474787 (1969-10-01), Grant
patent: 3605745 (1971-09-01), Hodosh
patent: 4561856 (1985-12-01), Cochran

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