Single use hypodermic syringe

Details Single use hypodermic syringe Single use hypodermic syringe

1993-11-15

1994-12-06

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

053706200

ABSTRACT:
A non-reusable syringe is provided with an annular locking groove having a seat proximal to the rear end of the barrel and a second annular locking groove with a second seat located near the proximal end of the barrel. The plunger for the non-reusable syringe is provided with a flexible disc preferably located directly behind the piston head so that when the plunger is inserted with the barrel, the disc can bend upwardly when sliding the plunger downwardly past the first seat of the annular locking groove and, yet, proximal relative movement of the plunger with respect to the barrel is precluded by the cooperation of the disc and the locking groove. When the plunger is fully pushd in the distal direction, the disc, again, can pass in one direction beyond the second locking groove and its seat and, yet, reciprocation or proximal movement of the plunger with respect to the barrel is precluded by the mechanical interaction of the disc with respect to the second locking groove and seat. In this manner, a non-reusable syringe is provided.

REFERENCES:
patent: 1008017 (1911-11-01), Crittenden
patent: 3823715 (1974-07-01), Holanek et al.
patent: 4391272 (1983-07-01), Staempfli
patent: 4979943 (1990-12-01), Trenner
patent: 4986820 (1991-01-01), Fischer
patent: 5047017 (1991-09-01), Koska

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