Disposable hypodermic syringe and needle combination having retractable, accident preventing sheath
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United States of America Patent
Stats
-
Oct 27, 1987
Grant Date -
N/A
app pub date -
May 22, 1986
filing date -
May 22, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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