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Distensible pet balloon and method of manufacture

  • US 5,645,789 A
  • Filed: 07/20/1995
  • Issued: 07/08/1997
  • Est. Priority Date: 07/20/1995
  • Status: Expired due to Term
First Claim
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1. A method for manufacturing a semi-compliant polyethylene terephthalate (PET) balloon which comprises the steps of:

  • positioning a tube of PET material across a mold cavity, said tube having a lumen extending therethrough;

    preheating said tube in said cavity to a first temperature to soften said PET material;

    pressurizing said lumen to a first pressure;

    stretching said tube a first predetermined distance to lengthen said tube;

    forming said balloon by raising said first pressure to a second pressure;

    thinning said balloon by decreasing said second pressure to a third pressure and additionally stretching said tube a second predetermined distance;

    sizing said balloon by increasing said third pressure to a fourth pressure;

    crystallizing said PET material of said balloon by decreasing said fourth pressure to a fifth pressure and increasing said first temperature to a second temperature; and

    cooling said PET material of said balloon by decreasing said second temperature to a third temperature.

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