Single use hypodermic syringe

Details Single use hypodermic syringe Single use hypodermic syringe

1992-01-15

1993-03-23

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604218, 604228, A61M 500

Patent

active

051959755

ABSTRACT:
A hypodermic syringe comprises a barrel, a plunger slidably received in the barrel, a drive shaft slidable in the barrel, and a connector for drivably connecting the drive shaft to the plunger. The connector has a plunger end including a first pair of resilient fingers insertable into the plunger, a drive shaft end having second pair of fingers insertable into the drive shaft, and an intermediate portion intermediate the plunger and drive shaft ends. The first pair of fingers has projections which engage apertures in the plunger. The second pair of fingers engages an annular rib in the drive shaft. When the drive shaft is fully inserted into the barrel to bottom the plunger, the drive shaft slides over the first pair of fingers, causing the fingers to retract and the projections to disengage from the apertures in the plunger. The connector remains engaged with the drive shaft, and separates from the plunger the drive shaft is withdrawn from the barrel, thereby preventing further use of the syringe.

REFERENCES:
patent: 4775363 (1988-10-01), Sandsdalen
patent: 4883466 (1989-11-01), Glazier
patent: 4915692 (1990-04-01), Verlier
patent: 4923443 (1990-05-01), Greenwood et al.
patent: 4950243 (1990-08-01), Estruch
patent: 5066280 (1991-11-01), Braithwaite

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