Single use disposable hypodermic syringe

Details Single use disposable hypodermic syringe Single use disposable hypodermic syringe

1988-04-15

1988-11-01

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604218, A61M 500

Patent

active

047816848

ABSTRACT:
A single use disposable hypodermic syringe is provided and comprises a hollow elongated barrel having a generally cylindrical inner surface having a longitudinal axis, an open end and another end having an annular shoulder with a central opening in which a cannula is positioned. A piston and a piston rod are provided and a plug formed from a clear, transparent and resilient but slightly compressible material is releasably secured to the piston and is in sealing relationship with the inner surface of the hollow elongated barrel and, when moved in axial directions functions to aspirate fluid into the hollow elongated barrel or to eject fluid from the hollow elongated barrel. Movement of the plug out of the hollow elongated barrel is prevented by a combination comprising a first portion movable with the plug and a second portion in a fixed position on the inner surface of the hollow elongated barrel and which combination operates only after the plug is in a compressed condition after the fluid has been ejected from the hollow elongated barrel. The first portion can be integral with or separate from the plug and functions in the same manner.

REFERENCES:
patent: 4233975 (1980-11-01), Yerman
patent: 4391272 (1983-07-01), Staempfli
patent: 4493703 (1985-01-01), Butterfield
patent: 4731068 (1988-03-01), Hesse

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