Method of making large diameter vascular prosteheses and a vascular prosthesis made by said method
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United States of America Patent
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Feb 13, 2001
Grant Date -
N/A
app pub date -
Feb 4, 1999
filing date -
Feb 4, 1999
priority date (Note) -
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Abstract
A method is disclosed for making vascular prostheses from ePTFE said prostheses having a diameter which is larger, and a wall thickness which is smaller than previously achievable using ram extrusion techniques. The method consists of extruding a PTFE tube, finish processing the tube into an ePTFE tube, laterally dilating it by expansion in incremental steps, calendering the tube after each dilating step, while the tube is being maintained at an elevated temperature. Once the tube is dilated it can be sintered with another tube to form a laminate. Alternatively, a wire stent may be joined with one or more tubes, thereby biasing the laminate to a cylindrical configuration.
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