Single-use syringe

Details Single-use syringe Single-use syringe

1988-12-30

1990-11-27

Rosenbaum, C. Fred

Surgery

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

Treating material introduced into or removed from body...

A61M 500

Patent

active

049733109

ABSTRACT:
An operable syringe assembly includes a barrel having an inside surface describing a chamber for retaining fluid, an open barrel end, and a distal barrel end having a passageway therethrough in fluid communication with the chamber. A plunger rod includes an elongate body portion, a proximal end and a distal end with a stopper positioned at the distal end. The stopper slidably positioned in fluid-tight engagement in the barrel. A locking element is positioned in the barrel between the plunger rod and the inside surface of the barrel. Locking element includes a proximally and outwardly facing locking barb, a distally and inwardly facing resisting edge and an inwardly facing driving edge. Driving edge interacts with the plunger rod to move the locking element along the barrel as the stopper is advanced distally along the barrel. The resisting edge and the barb prevent proximal motion of the plunger rod with respect to the barrel after the initial motion of the stopper to expel fluid through the passageway wherein proximal motion of the plunger rod with respect to the barrel causes the resisting edge to engage the plunger rod causing the locking element to move in a proximal direction wherein the locking barb engages the inside surface of the barrel to prevent further proximal movement of the plunger rod with respect to the barrel. A barrier element is provided on the plunger rod for limiting the delivery volume of the syringe assembly by establishing the maximum proximal position of the locking element with respect to the plunger rod.

REFERENCES:
patent: 1496654 (1924-06-01), Crowther
patent: 2216354 (1940-10-01), Pletcher
patent: 3890971 (1975-06-01), Leeson et al.
patent: 4367738 (1983-01-01), Legendre et al.
patent: 4386606 (1983-06-01), Tretinyak et al.
patent: 4758232 (1988-07-01), Chak
patent: 4781683 (1988-11-01), Wozniak et al.
patent: 4781684 (1988-11-01), Trenner
patent: 4840616 (1989-06-01), Banks

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