Dilatation catheter balloon made from PEN based homopolymer or random copolymer
AssigneeSciMed Life Systems, Inc.
InventorsDavid A. Ferrera, Ronald a. Sahatjian, Andrew J. Campbell, George C. Michaels
Life of this patent
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Abstract
A balloon for a medical device has a structural layer of a highly crystallized PEN polymer material. The PEN polymer material a polyethylene naphthalate homopolymer or a crystallizable copolyester made up of residues of ethylene glycol, naphthalene dicarboxylic acid (NDC) and at least one member of the group (PA) consisting of terephthalic acid and isophthalic acid. The NDC groups make up about 5% or more of the sum of NDC and PA groups in the copolymer. The balloon is characterized by an ability to withstand a hoop stress of at least 35,000 psi without bursting.
Claims17
A medical catheter having thereon a balloon, the balloon comprising a structural layer of a PEN polymer material, the PEN polymer material being
- a) a polyethylene naphthalate homopolymer or
- b) a crystallizable copolyester comprising residues of
- i) ethylene glycol,
- ii) naphthalene dicarboxylic acid and
- iii) at least one PA residue, said PA residue being a member of the group consisting of residues of terephthalic acid and isophthalic acid, the naphthalene dicarboxylic acid residues comprising about 5% or more of the sum of naphthalene dicarboxylic acid residues and PA residues in the copolyester, and,
- the balloon characterized by an ability to withstand a hoop stress of at least 50,000 psi without bursting.
A medical catheter having thereon a balloon comprising a structural layer of a crystallizable copolyester comprising residues of
- i) ethylene glycol,
- ii) naphthalene dicarboxylic acid and
- iii) at least one PA residue, said PA residue being a member of the group consisting of residues of terephthalic acid and isophthalic acid,
- the naphthalene dicarboxylic acid residues constituting at least 80% of the sum of naphthalene dicarboxylic acid residues and PA residues.
A medical catheter having a balloon thereon, the balloon comprising at least two structural layers,
- one layer being a PEN polymer layer, the PEN polymer material being
- a) a polyethylene naphthalate homopolymer or
- b) a crystallizable copolyester comprising residues of
- i) ethylene glycol,
- ii) naphthalene dicarboxylic acid and
- iii) at least one PA residue, said PA residue being a member of the group consisting of residues of terephthalic acid and isophthalic acid, the naphthalene dicarboxylic acid residues at least 80% of the sum of naphthalene dicarboxylic acid residues and PA residues in the copolyester, and
- one layer being a polybutylene naphthalate homopolymer or a butylene naphthalate copolymer.
Dependencies are inferred from the claim text.