专利名称：Articles including expanded
polytetrafluoroethylene membranes withserpentine fibrils having a discontinuousfluoropolymer layer thereon
发明人：Larry J Kovach,Rachel Radspinner申请号：US15341467申请日：20161102公开号：US09987395B2公开日：20180605
专利附图：
摘要：Articles comprising an expanded polytetrafluoroethylene membrane having
serpentine fibrils and having a discontinuous coating of a fluoropolymer thereon areprovided. The fluoropolymer may be located at least partially in the pores of theexpanded fluoropolymer membrane. In exemplary embodiments, the fluoropolymer isfluorinated ethylene propylene. The application of a tensile force at least partiallystraightens the serpentine fibrils, thereby elongating the article. The expandedpolytetrafluoroethylene membrane may include a microstructure of substantially onlyfibrils. The articles can be elongated to a predetermined point at which further
elongation is inhibited by a dramatic increase in stiffness. In one embodiment, the articlesare used to form a covered stent device that requires little force to distend in the radialdirection to a first diameter but is highly resistant to further distension to a seconddiameter (stop point). A large increase in diameter can advantageously be achieved priorto reaching the stop point.
申请人：W. L. Gore & Associates, Inc.
地址：Newark DE US
国籍：US
代理人：Amy L. Miller
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