Dual chamber internal by-pass syringe assembly

Details Dual chamber internal by-pass syringe assembly Dual chamber internal by-pass syringe assembly

1995-02-27

1997-11-11

Buiz, Michael Powell

Surgery

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

Treating material introduced into or removed from body...

604181, 604191, 604 82, A61M 3700

Patent

active

056858469

ABSTRACT:
A syringe device for use with two components to be combined prior to discharge, comprising a syringe body without the proximal end, a syringe plunger rod threadedly engageable into a plunger and a lined seal for engagement with a needle hub. The syringe body has at the distal end a radially inwardly directed internal sealing ring dividing the body to define a distal chamber and a proximal chamber. Also provided is an internal bypass stopper sized to fit the syringe body and engage the sealing ring to sealingly separate the distal chamber and the proximal chamber. The stopper has a plurality of projections circumferentially spaced thereon for engagement with the syringe body on at least one side of the sealing ring. The projections define by-pass channels therebetween to permit flow of liquid from the proximal chamber to the distal chamber upon movement of the stopper toward the distal end.

REFERENCES:
patent: 4613326 (1986-09-01), Szwarc
patent: 4952208 (1990-08-01), Lix
patent: 5122117 (1992-06-01), Haba et al.
patent: 5429610 (1995-07-01), Vaillancourt
patent: 5472422 (1995-12-01), Ljungquist
patent: 5489266 (1996-02-01), Grimard

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