Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including application of internal fluid pressure to hollow...
Patent
1998-08-21
1999-09-14
Acquah, Samuel A.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Including application of internal fluid pressure to hollow...
604 96, 604 97, 604 98, 604 99, 604100, 604101, 604102, 604103, 604264, 604280, 604281, 604282, 606191, 606192, 606194, 264500, B29C 3902, A61M 2900
Patent
active
059519410
ABSTRACT:
Balloons for medical devices, particularly balloon angioplasty catheters, are made from particular block copolymer thermoplastic elastomers in which the block copolymer is made up of hard segments of a polyester or polyamide and soft segments of polyether; the polyester hard segments are polyesters of an aromatic dicarboxylic acid and a C.sub.2 -C.sub.4 diol; the polyamide hard segments are polyamides of C.sub.6 or higher carboxylic acids and C.sub.6 or higher organic diamines or of C.sub.6 or higher aliphatic .omega.-amino-.alpha.-acids, and the polyether soft segments are polyethers of C.sub.2 -C.sub.10, diols; the block copolymer has a low flexural modulus, namely less than 150,000 psi; the block copolymer has a hardness, Shore D scale, of greater than 60; and the percentage by weight of the block polymer attributable to the hard segments is between about 50% and about 95%. The polymers provide high strength, thin wall, compliant and semi-compliant balloons, which leads to a low profile catheter. The low profile catheters have very good initial crossing, good trackability, good recrossing after first inflation.
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Chen Jianhua
Wang Lixiao
Acquah Samuel A.
Sci-Med Life Systems, Inc.
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