发明名称 |
Method of making controlled porosity expanded polytetrafluoroethylene products and fabrication |
摘要 |
A method of forming porous articles with a varying pore distribution by extrusion from a billet with a varying lubricant distribution. A single-polymer polytetrafluoroethylene is extruded and then stretched and sintered to provide a differential porous PTFE structure composed of fibers and nodes connected to one another by these fibers. The microfibrous structure has a portion within the cross-section that possesses a different pore size, accompanied by a different node and fiber geometry, than adjacent areas within that cross section. In a vascular graft, the pores taper inwardly, providing a fluid-tight lumen wall structure that prevents leakage, yet promotes cellular ingrowth and natural tissue regeneration. A node structure of radially-oriented plates provides flexibility, suture strength, and enhanced protection against collapse. |
申请公布号 |
US5861033(A) |
申请公布日期 |
1999.01.19 |
申请号 |
US19970792571 |
申请日期 |
1997.01.30 |
申请人 |
ATRIUM MEDICAL CORPORATION |
发明人 |
MARTAKOS, PAUL;KARWOSKI, THEODORE;HERWECK, STEVE A. |
分类号 |
A61F2/06;A61L27/16;A61L27/56;B29C47/00;B29C55/00;B29C69/00;B29D23/00;B29K27/12;B29K105/04;D02J1/06;(IPC1-7):A61F2/02 |
主分类号 |
A61F2/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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