Coextruded balloon and method of making same
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United States of America Patent
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Jun 23, 1998
Grant Date -
N/A
app pub date -
Feb 28, 1997
filing date -
Feb 28, 1997
priority date (Note) -
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Abstract
An expander member for a balloon catheter to be used in stent delivery applications comprises a double-walled tubular member that is adapted for attachment to a distal end portion of an elongated, flexible, tubular catheter body. The outer wall is preferably a polyamide, such as Nylon-12, and the inner wall is PET. By properly controlling the percentage of the polyamide relative to the PET content, the distension characteristics of the resulting expander member can be tailored to fall in a range less than 15 percent. The outer Nylon-12 layer provides the expander member with high abrasion resistance. By appropriately temperature annealing the expander member, any tendency toward winging upon deflation thereof is reduced.
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