Single-use fillable syringe

Details Single-use fillable syringe Single-use fillable syringe

1988-10-14

1990-03-06

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604228, A61M 500

Patent

active

049062310

ABSTRACT:
A single-use disposable hypodermic syringe is described in which a plunger is initially coupled to a piston to permit filling of the syringe with fluid. During the filling step, the plunger is constrained to only move in the outward direction as required for filling. In order for injection to occur, the plunger must be rotated into a second position in which the plunger is irreversibly decoupled from the piston. In this position, the plunger is constrained so that it may only move inwardly as required for injection. The plunger and plunger guide also include corresponding sets of ribs and detents which cooperate in a rachet action to restrict the direction of travel of the plunger. This restriction means that the plunger can be pulled out only once (to draw liquid into the syringe) and pushed in only once (to expel the liquid from the syringe). Since the plunger can no longer be recoupled to the piston, and also since the plunger is locked in its forward position, re-use of the syringe is rendered impossible.

REFERENCES:
patent: 4252118 (1981-02-01), Richard et al.
patent: 4367738 (1983-01-01), Legendre et al.
patent: 4699614 (1987-10-01), Glazier
patent: 4826483 (1989-05-01), Molnar

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