Pre-filled syringe with flow valve

Details Pre-filled syringe with flow valve Pre-filled syringe with flow valve

1992-09-14

1993-12-28

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604238, A61M 500

Patent

active

052735427

ABSTRACT:
The present invention is a hypodermic syringe pre-filled with a volume of a desired solution. A plug member is positioned within the hypodermic syringe in between the pre-filled fluid and the lumen of the syringe's cannula. The presence of the plug member within the hypodermic syringe separates the cannula from the pre-filled fluid thereby leaving the cannula unaffected by the presence of the fluid within the syringe. As the plunger of the hypodermic syringe is engaged, the pressure of the pre-filled fluid is increased. The fluid pressure acts upon the plug member, displacing the plug member when a predetermined fluid pressure is achieved. Once the plug member is displaced, the occlusion between the pre-filled fluid and the cannula is removed and the pre-filled fluid is free to flow through the lumen of the cannula.

REFERENCES:
patent: 2893390 (1959-07-01), Lockhart
patent: 3941128 (1976-03-01), Baldwin
patent: 4479801 (1984-10-01), Cohen
patent: 4932939 (1990-06-01), Magre et al.

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