Patent ID: 6482348
Filing Date: 2002-11-19
Classification: A61B,A61L,A61M,Y10T

Abstract:
A method of forming a balloon for medical purposes, said method comprising;co-extruding in a tubular shape a base structural layer of a member selected from the group consisting of polyamides, polycarbonates, polyesters and copolymers thereof and a heat sealable layer selected from the group consisting of polyethylene and copolymers thereof; biaxially orienting said base structural layer by inflating said tube with a gas to a predetermined central diameter greater than the initial diameter of the tubular shape and simultaneously heating the inflated tube to a temperature sufficient to biaxially orient said base structural layer; cooling the inflated tubular member; elevating the temperature of the inflated tube for a second time to said biaxially orienting temperature; allowing the twice-heated tube to cool and withdrawing the gas whereby the tubular member will assume a generally tubular shape and said,main structural layer will remain biaxially orientated and said heat sealable layer will not be biaxially orientated.