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Dilation catheter method and apparatus

  • US 4,271,839 A
  • Filed: 07/25/1979
  • Issued: 06/09/1981
  • Est. Priority Date: 07/25/1979
  • Status: Expired due to Term
First Claim
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1. Apparatus for dilating a partially occluded section of a blood vessel, said apparatus comprising:

  • an elongated flexible generally inelastic catheter having an outside diameter less than the internal diameter of the nonoccluded vessel;

    balloon means inverted within the catheter, said balloon means having a mouth peripherally sealed to the distal end of the catheter and being evertable out of the catheter in response to the exertion of fluid pressure within the catheter for substantially anisotropic expansion out of the catheter and through the occluded section of the vessel in advance of substantial lateral expansion and, upon eversion out of the catheter, being laterally expansible in response to the continued exertion of fluid pressure internally of the catheter to an outside diameter equal to or greater than the internal diameter of the vessel; and

    means to selectively impart internal pressure to the catheter.

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