ANTI-FREE FLOW VALVE

Japanese Patent JP2017056090

A

PROBLEM TO BE SOLVED: To prevent unexpected inflow of liquid in a liquid container such as an injector into a patient body.SOLUTION: An anti-free flow valve interposed between a liquid container Fc and a liquid passage Sc includes: a connection path Cc connecting the liquid container Fc and the liquid passage Sc; valve bodies Vp, Vv, Vcp, and Vvp opening/closing the connection path Cc; and valve body energization means for energizing the valve bodies Vp, Vv, Vcp, and Vvp by closing the connection path Cc even when pressure in one of the liquid container Fc and the liquid passage Sc is higher than pressure in the other side in the a case where a pressure difference between that in the liquid container Fc and that in the liquid passage Sc is less than a specified quantity, so as to block flow of liquid from a side with high pressure to the other side, and by opening the connection path Cc even when pressure in one of the liquid container Fc and the liquid passage Sc is higher than pressure in the other side in a case where a pressure difference between that in the liquid container Fc and that in the liquid passage Sc is a specified quantity or more, so as to allow flow of liquid from a side with high pressure to the other side.SELECTED DRAWING: Figure 1-1

WO/2001/091829	PRIMING DEVICE FOR MEDICAL INFUSION SYSTEMS
JP3234453	Backflow stopper to prevent backflow of urine
WO/2022/029190	CATHETER ARRANGEMENT INCLUDING A VALVE ELEMENT ELASTICALLY DEFORMABLE BY FLUID PRESSURE

SANO YOSHIHIKO
HARADA TSUKUHIDE

JP2015185122A

March 23, 2017

September 18, 2015

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NIPRO CORP
HARADA ELECTRONICS IND

A61M39/24; A61M5/168; A61M5/31

JP2007289733A	2007-11-08
JPH05505966A	1993-09-02
JP2008104776A	2008-05-08
JPS60222672A	1985-11-07
JP2013507181A	2013-03-04
JP2014516610A	2014-07-17
JP2007167645A	2007-07-05
JP2009000579A	2009-01-08

Ginza Marronnier Patent Office

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