Patent ID: 7270675

Claim:
A medical device having a tubular membrane structure comprising: a radially expandable structural frame, including a proximal anchor having a substantially cylindrical configurations with first and second open ends and a longitudinal axis extending there between, and a plurality of connecting members each having a first and a second end and being oriented parallel to the longitudinal axis, wherein the first end of each connecting member is attached to the proximal anchor; a polymer fiber membrane electrostatically spun over at least a portion of the exterior surface of the connecting members; and a polymeric outer membrane coated over the fiber membrane, the polymeric outer membrane and fiber membrane combining to form the tubular membrane structure, the tubular membrane structure terminating with a plurality of, supple valve flaps, each supple valve flap having a distally oriented leading edge defined along the circumference of the tubular membrane structure by adjacent connecting members, wherein the leading edge of the supple valve flap is frameless.