Method of forming a co-extruded balloon for medical purposes

Details Method of forming a co-extruded balloon for medical purposes Method of forming a co-extruded balloon for medical purposes

1995-04-24

2000-10-24

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264515, 604 96, 606194, B29C 4922

Patent

active

061362581

ABSTRACT:
A method of forming a balloon for medical purposes including co-extruding in a tubular shape a base structural layer of polyamides, polycarbonates, polyesters and copolymers thereof and a heat sealable layer 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 The twice-heated tube is allowed to cool and the gas is withdrawn whereby the tubular member will assume a generally tubular shape and the main structural layer will remain biaxially orientated and the heat sealable layer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.

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