Single use syringe assembly

Details Single use syringe assembly Single use syringe assembly

1994-02-14

1996-07-02

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604187, A61M 500

Patent

active

055316913

ABSTRACT:
A single use syringe is provided having a rod-like plunger comprising a plurality of cylindrical ratchet teeth. A resilient locking spring dangles on the ratchet teeth of the plunger. The original location of the locking spring determines the maximum dosage which may be administered by the syringe. A first withdrawal of the plunger with respect to the barrel allows medication to be drawn into the barrel. The tab of the locking spring resiliently cams over the surface of the ratchet teeth. The locking spring is maintained in position along the barrel by outwardly directed contact points which embed into the interior side wall of the barrel. During administration of the medication, i.e., when the plunger is distally pushed with respect to the barrel, the locking spring tab cooperates with the base of the ratchet teeth and causes the spring to move along with the plunger. A second attempted withdrawal of the plunger is blocked once the locking spring has been moved to its full distal position. The thumb engaging disk of the plunger can be bent and broken off to further prevent a second use of the syringe. The disk is also useful for inventory control. The thumb engaging disk and the proximal end of the barrel mechanically cooperate as a further locking mechanism to also prevent reusability.

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