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Dilatation catheter and method for widening of strictures

  • US 5,163,906 A
  • Filed: 03/12/1992
  • Issued: 11/17/1992
  • Est. Priority Date: 09/27/1988
  • Status: Expired due to Term
First Claim
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1. A method of widening a stricture in a blood vessel, the method comprising:

  • a) providing a dilatation catheter comprising an elongated dilatation balloon arranged on a support tube and extensible up to a defined extent by means of an external pressure/section pump connected to the support tube, and a sealing balloon arranged on the support tube in the axial direction distally of and at a distance from the dilatation balloon, the wall of which sealing balloon is elastically extensible by means of an external pressure/suction pump connected to the support tube to seal off the vessel distally of the structure, with a draw-off and inlet opening being provided in the support tube distal to the dilatation balloon and proximal to the sealing balloon, said opening being of a size sufficient to accommodate detached structure material which can be drawn off to the exterior of the catheter or through which a washing fluid can be introduced;

    b) positioning the dilatation catheter at the site of a stricture so that the sealing balloon is situated distally of the stricture and the dilatation balloon is situated within the stricture;

    c) inflating the sealing balloon to an extent sufficient to seal off the vessel distally of the stricture;

    d) inflating the dilatation balloon to an extent sufficient to widen the stricture;

    e) drawing off any detached stricture material through the opening while simultaneously or immediately thereafter deflating the dilatation balloon; and

    f) deflating the sealing balloon and removing the dilatation catheter from the site of the stricture.

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