Insertable element for preventing reuse of plastic syringes

Details Insertable element for preventing reuse of plastic syringes Insertable element for preventing reuse of plastic syringes

1991-07-19

1993-04-27

Rosenbaum, C. Fred

Surgery

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

Treating material introduced into or removed from body...

604220, A61M 500

Patent

active

052058255

ABSTRACT:
A locking device is capable of being retrofitted by insertion into a standard plastic syringe. The syringe is of the type having a cylindrical inner wall made of plastic material, a closed, distal end, and an open, proximal end for movement of a plunger therein. The plunger has a plunger stem made of plastic material with longitudinal ribs in an "X" shaped cross-section. The locking device has a clip-type body portion formed with a U-shaped channel for clipping onto one longitudinal rib, a first set of barbed points angled toward the plunger stem for engaging the plunger stem when it is depressed toward the distal end after a first retraction movement toward the proximal end of the syringe, and a second set of barbed points angled toward the inner wall of the syringe for engaging the inner wall in order to lock the plunger stem from a second retraction movement, thereby preventing reuse of the syringe. Another spring-type version of the locking device is formed from a single piece of rhombic-shaped sheet metal with an arched spring shape, one pair of barbed points on opposing lateral edges, and another barbed point at a point of the rhombic-shaped metal.

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