Method for forming a yarn wrapped PTFE tubular prosthesis
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United States of America Patent
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-
Jun 27, 2000
Issued Date -
N/A
app pub date -
Nov 4, 1997
filing date -
Mar 14, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An implantable microporous ePTFE tubular vascular graft exhibits long-term patency, superior radial tensile strength, reduction in tear propagation, and increases in suture retention strength and crush resistance. The graft includes an ePTFE tubular structure having a preselected microporous structure. The tubular structure is wrapped externally with a PTFE yarn in a helical fashion. The helical wrap of yarn is bonded to the exterior surface of the tubular structure by application of heat or heat in combination with force to form a composite structure which substantially maintains the porosity of the underlying tubular structure while increasing the suture retention strength, radial tensile strength, crush resistance, and tear propagation resistance.
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