Safety hypodermic needle and shielding cap assembly

Details Safety hypodermic needle and shielding cap assembly Safety hypodermic needle and shielding cap assembly

1995-09-25

1996-12-17

Green, Randall L.

Surgery

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

Treating material introduced into or removed from body...

604192, 604198, 604110, A61M 532

Patent

active

055848184

ABSTRACT:
A safety hypodermic needle and shielding device has a spring-loaded safety shield (1) with a one-way locking device (18, 21) which prevents return travel of the safety shield in a direction towards a syringe (3). This prevents exposure of a needle point (15) that has been used. A preferred one-way locking device is a pivot plate (18) positioned in the shielding device with the syringe-needle cannula shaft (2) extended through a locking orifice (20) in the pivot plate. For low-angle use of the syringe, a spring for spring-loading the shielding device is at least one leaf spring (17 or 17a) having expansion in a plane parallel to the syringe-needle shaft. A cannula sheath (14) has a cannula skirt (13) that is positioned in locking relationship to a quick-release latch (6, 24, 30) as a safety lock prior to use. A shield on another embodiment uses a concave flat, elongated spring (17a) to act as a resistant column to prevent the safety shield from being pushed to expose the needle point once the syringe has been used.

REFERENCES:
patent: 4850977 (1989-07-01), Bayless
patent: 4955866 (1990-09-01), Corey
patent: 5334149 (1994-08-01), Nortman et al.
patent: 5348544 (1994-09-01), Sweeney et al.
patent: 5395347 (1995-03-01), Blecher et al.
patent: 5423766 (1995-06-01), Di Cesare

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