Abstract: A stent with at least one cross-section having either a vertex or having first and second contour points where the radius of curvature of the first point is at least 2.5 times the radius of curvature of the second point.
Abstract: A cylindrical lining for insertion into a body lumen having a fluctuating caliber, such as a pulsating artery, peristaltic organ, or a lumen adjacent to a sphincter. The lining has a radial resistance less than a radial force applied to it by the lumen as the caliber of the lumen fluctuates so as to allow the lining to continuously conform to the shape of the lumen.