Hypodermic syringe having retractable needle

Details Hypodermic syringe having retractable needle Hypodermic syringe having retractable needle

1997-01-10

1999-04-06

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604232, A61M 532

Patent

active

058911049

ABSTRACT:
An economical hypodermic syringe is provided. A retractable needle head is provided to slide along longitudinal grooves in the barrel of the syringe. Notches in the grooves engage teeth provided on tabs of the needle head, and lock the needle head in a predetermined position. The tabs are resilient, and if squeezed against the resilient bias, will disengage from the notches in the grooves. In this way, the needle may be partially or fully withdrawn into the barrel. In addition or alternatively, a needle cover is included which is adapted to serve as the plunger of the syringe. The outer diameter of the needle cover is narrower than the inner diameter of both the barrel and an ampoule.

REFERENCES:
patent: 4834717 (1989-05-01), Haber et al.
patent: 5120311 (1992-06-01), Sagstetter et al.
patent: 5324272 (1994-06-01), Smedley et al.
patent: 5445620 (1995-08-01), Haber et al.
patent: 5514107 (1996-05-01), Haber et al.

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