Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1992-10-13
1993-06-29
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604198, 604218, A61M 500
Patent
active
052229459
ABSTRACT:
A safety syringe includes a barrel having an interior chamber for containing a fluid, and a needle mounted at one end of the barrel. The needle has a bore in fluid communication with the interior chamber in the barrel. A plunger is slidably mounted within the interior chamber of the barrel for displacing fluid within the barrel through the needle to administer fluid to a patient. A protective shield is slidably mounted on the barrel and is moveable between an extended position in which the needle is concealed and a retracted position in which the needle is exposed. The protective shield is moveable between first, second, and third positions. In the first position, the protective shield is extended over the needle and is releasibly locked to protect the needle prior to use. In the second position, the protective shield is retracted and is releasibly locked to facilitate use of the syringe. In the third position, the protective shield is again extended to cover the needle and is irreversibly locked to prevent reuse of the syringe. Reuse of the syringe is further prevented by a plunger locking mechanism which is engaged when the plunger is fully depressed.
REFERENCES:
patent: 4801295 (1989-01-01), Spencer
patent: 4813940 (1989-03-01), Parry
patent: 4820272 (1989-04-01), Palmer
patent: 4826491 (1989-05-01), Schramm
patent: 4994045 (1991-02-01), Ranford
patent: 5024660 (1991-06-01), McNaughton
patent: 5057079 (1991-10-01), Tiemann et al.
patent: 5104385 (1992-04-01), Huband
patent: 5147326 (1992-09-01), Talonn et al.
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