Disposable pre-filled syringe with retractable needle

Details Disposable pre-filled syringe with retractable needle Disposable pre-filled syringe with retractable needle

1991-12-06

1993-09-07

Rosenbaum, C. Fred

Surgery

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

Treating material introduced into or removed from body...

604195, 604240, 604220, A61M 532

Patent

active

052424006

ABSTRACT:
A pre-filled hypodermic syringe includes a retractable needle and detachable plunger shaft so the syringe can be selectively rendered inoperable. A liquid held within the syringe is held in place by a elastomeric stop that surrounds the discharging tip of the needle. When the syringe is to be used, the needle stop is removed and the plunger is advanced within the syringe barrel until the liquid is displaced through the needle. When the plunger contacts the base of the needle within the syringe barrel, the plunger becomes capable of being rotated. The rotation of the plunger connects the plunger to the needle and the needle can be retracted into the syringe barrel with the plunger. Once fully retracted, the needle cants and the plunger shaft can be destructively disconnected from the plunger, rendering the syringe inoperable.

REFERENCES:
patent: 2671450 (1954-03-01), Dann
patent: 2688963 (1954-09-01), Smith
patent: 3865236 (1975-02-01), Nycroft
patent: 4747830 (1988-05-01), Gloger et al.
patent: 4790822 (1988-12-01), Haining
patent: 4947863 (1990-08-01), Haber et al.
patent: 4961730 (1990-10-01), Ponez
patent: 4964866 (1990-10-01), Szware
patent: 4986813 (1991-01-01), Blake, III et al.
patent: 5026345 (1991-06-01), Teringo
patent: 5084017 (1992-01-01), Mafletone

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