发明名称 |
Radially expandable tubular polytetrafluoroethylene grafts and method of making same |
摘要 |
The present invention relates to a method of making a laminated expandable polytetrafluoroethylene (PTFE) elongated member that is radially expandable to at least 7 times its unexpanded diameter by a pressure of less than 6 atmospheres, the method comprising the steps of: selecting a PTFE material with an average molecular weight of about 120 million and an average particle size in a range of from about 350 to about 759 microns (µm); providing a mixture of the PTFE and a lubricant; compressing the mixture to form a compressed extrusion billet; extruding the billet as extruded strands; forming the extruded strands into tube lengths; expanding each tube length at a strain rate in a range of from about 10 %/sec to 200%/sec; contacting each tube length with at least one other unsintered elongate PTFE extrusion that has a different diameter from said tube length to form nesting elongated members; and sintering the nested elongated members. |
申请公布号 |
EP1557258(B1) |
申请公布日期 |
2016.10.05 |
申请号 |
EP20050007944 |
申请日期 |
1998.02.02 |
申请人 |
BARD PERIPHERAL VASCULAR, INC. |
发明人 |
EDWIN, TARUN J.;HURRY, FARIBA;BANAS, CHRISTOPHER E. |
分类号 |
A61F2/06;A61L27/16;A61L27/50;A61L31/04;B29C47/00;B29C55/00;B29C55/22;B32B27/28;B32B27/32 |
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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