Single use syringe

Details Single use syringe Single use syringe

1991-05-03

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, 604220, A61M 500

Patent

active

051063727

ABSTRACT:
A single use syringe assembly is provided and includes an elongate and generally cylindrical syringe barrel having a preferably annularly shaped ring member near the substantially closed distal end thereof. A plunger assembly is provided and includes an elongate plunger rod having a plunger tip and a locking disc on the distal end thereof and a compressible piston member mounted on the plunger tip of the plunger rod. The piston member includes a proximal recess therein to receive the plunger tip of the plunger rod therein. When the plunger assembly is moved distally and proximally in the syringe barrel during normal use, the piston member may be moved between the distal and proximal ends of the syringe barrel without disabling the syringe assembly. When the user desires to disable the syringe assembly, the plunger assembly is initially moved distally in the syringe barrel until the piston member contacts the distal end of the syringe barrel to expel the contents of the syringe assembly. Next, the distal movement of the plunger rod may be continued so that the plunger tip moves to a second position within the proximal recess of the piston member to move the locking disc on the plunger rod distally of the ring member on the syringe barrel. In this position, the proximal movement of the plunger assembly is prevented and the syringe assembly is disabled.

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