Patent ID: 7670368
Filing Date: 2010-03-02
Classification: A61F

Abstract:
1. A venous valve, comprising: a frame having corner portions that provide a spring force to counter radial compression of the frame and with intermediate portions therebetween, the intermediate portions having a cross-sectional geometry including at least a first planar surface of a predetermined width, where each intermediate portion is twisted about three fourths of a revolution into at least a partial helical configuration and does not intersect with any other intermediate portions, and the corner portions form a first vertex and a second vertex relative a first end of the frame, a third vertex and a fourth vertex at the first end of the frame relative the first and second vertex, where the first vertex and the second vertex are positioned opposite each other along a common axis; and a cover on the frame, wherein the cover includes surfaces defining a reversibly sealable opening for unidirectional flow of a liquid through the valve.