Single use-disposable hypodermic syringe

Details Single use-disposable hypodermic syringe Single use-disposable hypodermic syringe

1988-04-26

1989-12-19

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604208, A61M 500

Patent

active

048879991

ABSTRACT:
There is described a single use disposable hypodermic syringe and a manner for its manufacture. The syringe has a polystyrene barrel and a plunger assembly snuggly mounted for reciprocation therein. A plunger movement-limiting means is provided and comprises a first ratchet-like track section extending longitudinally of the barrel on its inside wall, a second ratchet-like track section parallel to and spaced from the first track section and oriented in a direction opposite to the first track, and a cross-over ratchet-like track section connecting the first and second track sections, and track engaging click means on the plunger assembly. The plunger assembly may be, moved outwardly of the barrel unidirectionally along the first track section to perform a syringe priming stroke; relocated within the barrel unidirectionally along the cross-over track section to the second track; and moved inwardly of the barrel unidirectionally along the second track section, to perform a delivery stroke.

REFERENCES:
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patent: 3949748 (1976-04-01), Malmin
patent: 4233975 (1980-11-01), Yerman
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patent: 4367738 (1983-01-01), Legendre et al.
patent: 4493703 (1985-01-01), Butterfield
patent: 4562844 (1986-01-01), Carpenter et al.
patent: 4650468 (1987-03-01), Jennings, Jr.
patent: 4775364 (1988-10-01), Alles

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