Full displacement retractable syringe

Details Full displacement retractable syringe Full displacement retractable syringe

1997-11-14

2000-01-18

Coggins, Wynn Wood

Refrigeration

604110, A61M 500

Patent

active

060154381

ABSTRACT:
A full displacement retractable syringe has a front mounted retraction mechanism and a plunger with a sliding seal and a retraction opening with a sliding stopper. A needle holder is held in place with a holding ring which seals the front part of the barrel from fluid leakage and forms the bottom of a variable chamber in the barrel. The top of the variable chamber is formed by the nose of the plunger with its sliding plunger seal and stopper. Substantially all of the fluid contained in the variable chamber is expelled through a needle when the plunger is depressed to bring the upper and lower boundaries of the fluid chamber together. Because the plunger seal is restrained from forward movement by a stop in the barrel, the nose of the plunger slides through the plunger seal to operate the retraction mechanism. When the holding ring and stopper are gradually removed an instable state is reached whereby a spring compressed under the head of the needle holder overcomes remaining holding forces and the needle holder and needle together with the stopper are forced rearwardly into the retraction cavity. The syringe can be reused only until the plunger is fully depressed after the last injection. Coincident with the retraction action, the plunger enters the barrel to prevent reuse.

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