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

1986-05-22

1987-10-27

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604263, A61M 532

Patent

active

047027380

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. Substantially axial guide channels are provided in the exterior surface of the barrel to accept an inwardly pointed boss of the sheath to guide the sheath into a second position and a third position. In the second position of the sheath, relative to the barrel and needle, the needle is at least partially exposed. In the 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. In alternative embodiments, instead of axial guide channels, the bosses of the sheath may be engaged in appropriately formed circumferential grooves or depressions formed in the outer surface of the barrel.

REFERENCES:
patent: 2571653 (1951-10-01), Bastien
patent: 3890971 (1975-06-01), Leeson et al.
patent: 4425120 (1984-01-01), Sampson et al.
patent: 4507118 (1985-03-01), Dent
patent: 4573976 (1986-03-01), Sampson et al.

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