Disposable syringe with a retractable needle

Details Disposable syringe with a retractable needle Disposable syringe with a retractable needle

2007-12-04

2007-12-04

Sirmons, Kevin C. (Department: 3767)

Surgery

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

Treating material introduced into or removed from body...

C604S110000, C604S192000, C604S195000, C604S240000, C604S243000

Reexamination Certificate

active

10975784

ABSTRACT:
A disposable syringe includes a tubular needle seat inserted into a barrel for fixing a needle cannula. The needle seat has an axially extending cavity with a radially yieldable catch disposed therein. A plunger is movable in the barrel, and has an engaging head defining a rearwardly facing shoulder wall which is retained by the catch when the engaging head is extended into the cavity by a pushing force applied to the plunger. The barrel defines friction diminishing regions such that when the needle seat is moved past the friction diminishing regions to be placed to a disposal position, friction between the needle seat and the barrel is diminished, thereby facilitating a subsequent pulling action of the plunger for retracting the needle cannula into the barrel.

REFERENCES:
patent: 5716341 (1998-02-01), Saito

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