Disposable syringe for one-time use

Details Disposable syringe for one-time use Disposable syringe for one-time use

1988-02-26

1989-11-07

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

048788996

ABSTRACT:
The disposable syringe comprises a cylindrical barrel having a side wall, an axis, and two ends, one of which, the distal end, has an inlet-outlet end for the administration of fluids. A cylindrical plunger is mounted snugly and fluid tight for axial movement within the barrel. An actuating rod has one, distal end connected to the plunger. The barrel at its other, proximal end has means for guiding the actuating rod axially. One or more pins of spring material are within the barrel, one, proximal end imbedded in the barrel side wall, and the other, free distal end located nearer the distal end of the barrel then the location of the proximal end of the pin. The plunger is movable from a position nearer the proximal barrel end to a position nearer the other, distal barrel end beyond the distal end of the pin, the barrel head on such movement camming the pin head outward from its normal position toward the wall of the barrel until the free end is freed by elasticity of the pin to return to its normal position radially within the wall, whereby on such movement the head is captured by the interposed pin free end to prevent return movement of the head toward the proximal end of the barrel thereby to prevent re-use of the syringe.

REFERENCES:
patent: 4731068 (1988-03-01), Hesse
patent: 4781684 (1988-11-01), Trenner

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