Method of forming a co-extruded balloon for medical purposes
First Claim
1. 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.
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Accused Products
Abstract
A method of forming a balloon for medical purposes comprising co-extruding in a tubular shape a base structural layer of a member selected from the group consisting oft polyamides, polycarbonates, polyesters and copolymers thereof and a heat sealable layer selected from the group consisting of polyethylene and copolymers thereof. The tubular member is then biaxially oriented by inflating the tube with a gas to a predetermined central diameter greater then the initial diameter of the tube and simultaneously heating the inflated tube to a temperature sufficient to biaxially orient the base structural layer. The member is then cooled the inflated tubular member and then elevated in temperature for a second time to the biaxially orienting temperature. The twice-heated tube is allowed to cool and the gas is withdrawn whereby the tubular member will assume a generally tubular shape and the main structural layer will remain biaxially orientated and the heat sealable layer will not be biaxially orientated.
416 Citations
1 Claim
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1. A method of forming a balloon for medical purposes, said method comprising;
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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.
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Specification