Hypodermic needle assembly

Details Hypodermic needle assembly Hypodermic needle assembly

1989-04-18

1990-04-10

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604198, 604263, A61M 532

Patent

active

049156977

ABSTRACT:
A needle assembly especially suited for hypodermic syringe use in which an axially collapsible sleeve is positioned over the needle. The sleeve includes an upper axially rigid portion sized to mount over the base portion of the needle, an axially collapsible intermediate portion, and an axially rigid lower portion defining a central bore sized to telescopically receive and protect the lower pointed end of the needle. In use, the sleeve selectively collapses axially as the needle enters the subject so that the point of the needle is never exposed during insertion, and selectively extends axially during withdrawal of the needle so that again the pointed tip of the needle is never exposed.

REFERENCES:
patent: 268996 (1882-12-01), Brinkerhoff
patent: 2674246 (1954-04-01), Bower
patent: 2847995 (1958-08-01), Adams
patent: 2888924 (1959-06-01), Dunmire
patent: 3134380 (1964-05-01), Armao
patent: 4507118 (1985-03-01), Dent
patent: 4564054 (1986-01-01), Gustausson
patent: 4775369 (1988-10-01), Schwartz
patent: 4795432 (1989-01-01), Karczmer

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