Hypodermic syringe

Details Hypodermic syringe Hypodermic syringe

1997-12-04

2000-04-25

McDermott, Corrine

Surgery

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

Treating material introduced into or removed from body...

604187, 604229, 604110, A61M 500

Patent

active

060538945

ABSTRACT:
A hypodermic syringe is disclosed wherein the medicine in the outlet tube leading to the hollow needle is caused to be injected into the patient. The expulsion of the fluid medicine from the outlet tube of the syringe is accomplished by an auxiliary piston which is normally carried by a primary piston. The mechanism used to force movement of the primary piston continues to drive an auxiliary piston, after the primary piston is stopped, to effectively force fluid medicine out of the outlet tube. Thereby, the amount of fluid medicine which may be discarded will lessen considerably.

REFERENCES:
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patent: 3985122 (1976-10-01), Topham
patent: 4688571 (1987-08-01), Tesler
patent: 4758223 (1988-07-01), Rydell
patent: 4846801 (1989-07-01), Okuda et al.
patent: 4997423 (1991-03-01), Okuda et al.
patent: 5242405 (1993-09-01), Howe
patent: 5458576 (1995-10-01), Haber et al.
patent: 5512054 (1996-04-01), Morningstar
patent: 5554132 (1996-09-01), Straits et al.
patent: 5782803 (1998-07-01), Jentzen

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