Plunger tip for blood gas syringe

Details Plunger tip for blood gas syringe Plunger tip for blood gas syringe

1992-02-07

1993-08-24

Hindenburg, Max

Surgery

Truss

Pad

128766, 604190, 604218, 604236, A61B 500

Patent

active

052380033

ABSTRACT:
An improved blood drawing syringe characterized by a barrel having a hollow cylindrical bore with an open rear end and a reduced diameter front end for the attachment of a needle, a pushrod disposed for slidable movement within the barrel, a piston attached to the forward end of the pushrod and having a circular disc with spaced apart forward and rear perforated faces enclosing a filter disposed between the faces, a sealing flange disposed around the periphery of the disc sized and dimensioned to fit slidingly within the cylindrical bore of the barrel and a flexible seal abutting the rear face of the disc and adapted to selectively cover the perforations in the rear face of the disc as a function of forward or rearward air pressure on the flexible seal.

REFERENCES:
patent: 4424817 (1984-01-01), Williams
patent: 4448206 (1984-05-01), Martell
patent: 4466446 (1984-08-01), Baidwan et al.
patent: 4572210 (1986-02-01), McKinnon
patent: 4632672 (1986-12-01), Kvitrud
patent: 4690154 (1987-09-01), Woodford et al.
patent: 4732162 (1988-03-01), Martell
patent: 4859336 (1989-08-01), Savas et al.

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