Patent ID: 6669724
Filing Date: 2003-12-30
Classification: A61F

Abstract:
A medical stent comprising:a first cylindrical body having a first diameter and a central axis, the first cylindrical body being defined by bending a wire in a zigzag-shape and covered at its inner and outer surfaces with a cover member; a second cylindrical body having a second diameter less than the first diameter and a second central axis identical to the central axis of the first cylindrical body, the second cylindrical body being defined by bending a wire in a zigzag-shape and covered at its inner and outer surfaces with a cover member; an intermediate cylindrical body for connecting the cover member of the first cylindrical body to the cover member of the second cylindrical body, the intermediate cylindrical body being formed of a material selected from the group consisting of silicone-based resin, polyurethane-based resin, and polyethylene-based resin; and a valve assembly for preventing fluid from being reversely flowing, the valve assembly comprising: first, second and third valve members formed extending from the central axis to an inner circumferential wall of the first cylindrical body and spaced away from each other at an angle of 120Â° in a circumferential direction on the inner circumferential wall, first, second and third valve members having first, second and third passages, respectively, and a length identical or greater than a longitudinal length of the first cylindrical body; and a supporting valve member for connecting the first, second and third valve members on the inner circumferential wall.