Syringe with automatically actuated shield

Details Syringe with automatically actuated shield Syringe with automatically actuated shield

1993-06-10

1995-07-04

Rosenbaum, C. Fred

Surgery

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

Treating material introduced into or removed from body...

604110, 604195, 604198, A61M 532

Patent

active

054296110

ABSTRACT:
An inner tubular assembly positioned in telescoping arrangement with an outer tubular protective assembly forms a chamber for a fluid receptacle in a hypodermic syringe; it supports a hypodermic needle and a piston plunger to inject fluid from or draw fluid into the receptacle. Biasing means acting between the inner and outer assemblies urge the inner assembly including the outer end of the needle to a retracted position. Levers in the form of finger pieces are pivotally mounted on the outer assembly; the levers are biased to urge the lugs formed at their ends through apertures in the outer assembly and into engagement with a shoulder at the lower end of the inner assembly to latch it in retracted position. When the finger pieces are grasped to use the syringe the latch is actuated to released position. Other lugs at the upper portion of the finger pieces aaaare engageable with a shoulder on the upper portion of the inner tubular assembly to retain the needle in exposed position ready for injection.

REFERENCES:
patent: 3019790 (1962-02-01), Militana
patent: 4631057 (1986-12-01), Mitchell
patent: 5104386 (1992-04-01), Alzain
patent: 5273541 (1993-12-01), Malenchek
patent: 5292314 (1994-03-01), D'Alessio et al.
patent: 5306258 (1994-04-01), de la Fuente

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