Retractable hypodermic syringe

Details Retractable hypodermic syringe Retractable hypodermic syringe

1990-05-23

1992-03-24

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604110, A61M 532

Patent

active

050984020

ABSTRACT:
A retractable hypodermic syringe is provided having a syringe body forming a barrel at one end and a tubular needle connector at the opposite end which surrounds a needle support passage and forms cam surfaces and locking recesses at the end portion of the needle connector. A needle support element is positionable within the needle support passage and has cam projections which are extendible through grooves defined along the needle support passage to bring the cam projections into registry with the cam surfaces. A plunger which is receivable within the syringe barrel is provided with an elongated projection that serves both as a piston support for a resilient piston carried thereby and as a needle support actuator which is movable into releasably interlocked relation with the needle support element thus enabling the plunger to impart both rotational and linear movement to the needle support element for its locking, unlocking and retracted positions relative to the syringe body. The plunger is movable to a position locking the forward portion of the plunger, the piston and the needle support element with a syringe needle affixed thereto at an enclosed and protected position within the syringe barrel. The plunger includes a frangible section enabling the rear portion of the plunger to be broken away after locking of the forward portion of the piston has been accomplished.

REFERENCES:
patent: 4883471 (1989-11-01), Braginetz et al.
patent: 4932939 (1990-06-01), Magre et al.
patent: 4950241 (1990-08-01), Ranford

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