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Medical tubes

  • US 4,957,508 A
  • Filed: 10/30/1987
  • Issued: 09/18/1990
  • Est. Priority Date: 10/31/1986
  • Status: Expired due to Term
First Claim
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1. An implantable tubular synthetic prosthesis for repairing or replacing tubular vessels which comprises a porous, high molecular weight elastomeric tube made of an elastomer selected from the group consisting of polyurethane, polyurethane urea, mixtures of polyurethane and polyurethane urea and mixtures of polyurethane and polyurethane urea with a silicone polymer, said elastomeric tube having an internal and external surface, wherein the internal surface exhibits a dilating force and the external surface exhibits a shrinking force such that the end portions of the tube dilates outwardly towards the external surface of the tube and said tube further dilating along its cut end portions to the external surface thereof when it is cut at any random position along the tube, transverse to its longitudinal direction, said dilation occurring in the area within 5 mm from said ends and cut ends, respectively, and the dilated maximum inner diameter is 1.4 times the inner diameter thereof.

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