Disposable hypodermic syringe and needle combination having retr

Details Disposable hypodermic syringe and needle combination having retr Disposable hypodermic syringe and needle combination having retr

1987-10-22

1989-01-31

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604199, 604263, A61M 532

Patent

active

048012955

ABSTRACT:
A disposable combination of a hypodermic syringe and needle has a sheath movably mounted on the syringe barrel to normally occupy a first position wherein the sheath extends to cover and protect the needle. In a second position of the sheath, relative to the barrel and needle, the needle is at least partially exposed. In a third position of the sheath, which is used for disposal of the syringe and needle combination, the needle is again covered by the sheath and preferably the sheath is irreversibly locked whereby abuse or misuse of the syringe and needle combination is substantially prevented. The sheath is made from a plastic material, such as styrene butadiene or acrylic styrene copolymer, which has a deflection temperature below the temperature required for heat sterilizing syringes. Consequently, upon attempted sterilization by heat, the sheath melts, thereby further rendering the combination usable only once.

REFERENCES:
patent: 3874383 (1975-04-01), Glowacki
patent: 4702738 (1987-10-01), Spencer

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