Safety hypodermic syringe

Details Safety hypodermic syringe Safety hypodermic syringe

1988-08-24

1989-09-05

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604263, 604192, A61M 532

Patent

active

048634352

ABSTRACT:
A hypodermic syringe provided with a safety hypodermic needle and shield assembly to obviate the danger of a handler thereof being accidentally pricked by the point of the needle after it has been injected in a patient and then withdrawn, the withdrawn needle possibly being contaminated with infectious microorganisms. The assembly includes a needle-supporting hub receivable in a socket formed at the front end of a fluid chamber having a projecting nozzle which is inserted in the hub to communicate with the needle. Integral with the hub is a cup-like pedestal on which is anchored a compressible helical spring that surrounds the needle and terminates in a shield having a bore therein to permit the needle to pass therethrough, the normal length of the spring being such as to place the shield just above the point of the needle. In the retracted mode of the assembly, the spring is compressed to retract the shield which is then held by a releasable latching mechanism supported on the pedestal, thereby exposing the needle to permit its use. After the needle is injected in a patient and withdrawn, the shield is unlatched to cause the assembly to assume its extended mode in which the shield covers the point of the needle to prevent human contact therewith.

REFERENCES:
patent: 4664654 (1987-05-01), Strauss
patent: 4795432 (1989-01-01), Karczmer

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