Method of increasing the tensile strength of a dilatation balloon
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United States of America Patent
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Apr 19, 1994
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N/A
app pub date -
Apr 6, 1993
filing date -
Sep 6, 1991
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Abstract
A method of making a dilatation balloon with a high percentage of the maximum tensile strength of the balloon material from a thin wall parison of a biaxially orientable polymer, such as polyethylene terephthalate (PET). A reverse temperature gradient (decreasing going from the inner to outer diameters) is applied across the sidewall of the parison by flowing a heated fluid through the parison and then sealing one end of the parison and expanding with a heated expansion fluid. Decreases in wall thickness and/or increases in burst strength across the wall can be achieved.
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