Patent ID: 7041126

Claim:
A flexible self-expandable stent, comprising: hollow cylindrical inside and outside stent bodies fabricated by knitting first and second super-elastic shape memory alloy wires to make a net-like structure of each of the inside and outside stent bodies in that the first wire, which is zigzagged with a diagonal length P in a longitudinal direction of each of the inside and outside stent bodies, is interlocked with the second wire, which is zigzagged with a diagonal length 2 P in the longitudinal direction, at different positions to form a plurality of interlocked points capable of allowing each of the inside and outside stent bodies to contract and expand in the longitudinal direction, with a plurality of intersecting points being formed by repeated intersection of the first and second wires at a plurality of positions between the interlocked points to allow each of the inside and outside stent bodies to apply a force against the longitudinal contraction thereof, and plurality of diamond-shaped meshes being defined by the interlocked points and the intersecting points, the first and second wires being thus interlocked with each other to be prevented form being separated from each other while allowing each of the inside and outside stent bodies to contract and expand; and a hollow rubber tube closely fitted between the inside and outside stent bodies, the hollow rubber tube having a length substantially equal to a length of each of the inside and outside stent bodies, wherein both distal and proximal ends of the rubber tube and the inside and outside stent bodies are intergrated into a single structure, wherein each the distal and proximal ends of the rubber tube and the inside and outside stent bodies is sewn with a thread by stitching to form a sewn end, and the sewn end is immersed in a polyurethane solution to form a resin-impregnated part, thus being integrated into the single structure.