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Method of making controlled porosity expanded polytetrafluoroethylene products and fabrication
Method of making controlled porosity expanded polytetrafluoroethylene products and fabrication
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机译:制备控制孔隙率的聚四氟乙烯产品的方法和制造方法
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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.
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