| 摘要 |
<p>A porous fluoropolymer article forms an artificial internal organ, for example, a vascular bypass, vascular access, or endovascular prosthesis. PTFE having a fibrous structure of nodes, and fibers connecting the nodes together forming a wall with radial zones of differing porosity in a porous tube. In one aspect an integrated intrawall (20) circumferential support adjacent to areas of variable porosity provides enhanced tunneling and cannulation. In another aspect, the wall (1, 2) of a prosthesis has a region (a, b, c) which modulates communication through the porosity of the wall. In another embodiment a two tube (14, 16) construction is cuffed, assembled into a similarly unitized, and seamless stent.</p> |
