Disposable hypodermic syringe and needle combination having retractable, accident preventing sheath
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United States of America Patent
Stats
-
Jan 31, 1989
Issued Date -
N/A
app pub date -
Oct 22, 1987
filing date -
May 22, 1986
priority date (Note) -
Expired
status (Latency Note)
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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.
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