Capless medical backcheck valve

Details Capless medical backcheck valve Capless medical backcheck valve

1994-11-30

1995-08-08

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604256, 13761418, A61M 500

Patent

active

054394511

ABSTRACT:
A medical backcheck valve includes a hollow housing containing an upwardly biased piston assembly for controlling liquid flow therethrough. The piston assembly comprises a substantially rigid plug having one end protruding from the upper end of the housing, and a flexible sheath covering having a relatively small diameter upper end surrounding the plug, a main seal for controlling flow through said first flow space, and a tubular lower end, secured at the bottom of the housing, for preventing liquid from entering within the covering.

REFERENCES:
patent: 3570484 (1971-03-01), Steer
patent: 3831629 (1974-08-01), Mackal et al.
patent: 4429856 (1984-02-01), Jackson
patent: 5006114 (1991-04-01), Rogers et al.
patent: 5049128 (1991-09-01), Duquette
patent: 5147333 (1992-09-01), Raines
patent: 5201725 (1993-04-01), Kling
patent: 5242432 (1993-09-01), Defrank
patent: 5284475 (1994-02-01), Mackal
patent: 5353837 (1994-10-01), Faust

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