Multilayer extrusion as process for making angioplasty balloons

(57) A summary and the purpose Offer the balloon catheter which has the feature which burst intensity is high, and expansion of the radial direction under high pressure is low, and it can join to the main part of a catheter easily, is low, and does not have a pinhole burst. Of a coefficient of friction Composition 2 axis orientation polyester of the 1st layer that consists of 2 axis orientation tubular polyester, and the 1st above-mentioned layer is an expansion component which attaches the 2nd layer that consists of another tubular 2 axis orientation polymer to the medical catheter joined by coaxial extrusion.