Clinical Syringe to be rendered useless after being used once

Details Clinical Syringe to be rendered useless after being used once Clinical Syringe to be rendered useless after being used once

1991-02-27

1992-04-21

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604218, A61M 500

Patent

active

051063719

ABSTRACT:
The present invention provides a clinical syringe to be rendered useless after being used once. It comprises a barrel with a needle fitting hub, a piston sealingly and slidably fitted within the barrel and a piston rod connected to the piston. The piston head is provided with a resilient detent plug with a slot thereon, and an injection opening is defined at a position of the barrel corresponding to the detent plug, the diameter of which is smaller than the inner diameter of the needle fitting hub. A U-shaped notch is punched at the top surface of the piston head adjacent the detent plug to form a U-shaped tongue. If the piston rod is to be pulled back after the syringe being used once, the piston head would be torn at the U-shaped notch due to the retaining of the detent plug by the bottom surface of needle fitting hub, rendering it incapable of drawing the injection fluid.

REFERENCES:
patent: 4233975 (1980-11-01), Yerman
patent: 4687467 (1987-08-01), Cygielski
patent: 4713056 (1987-12-01), Butterfield
patent: 4826483 (1989-05-01), Molnar, IV
patent: 4863427 (1989-09-01), Cocchi
patent: 4874372 (1989-10-01), McArthur et al.
patent: 4880410 (1989-11-01), Rossmark
patent: 4883466 (1989-11-01), Glazier
patent: 4923443 (1990-05-01), Greenwood et al.

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