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Balloon catheters

  • US 5,090,958 A
  • Filed: 10/05/1990
  • Issued: 02/25/1992
  • Est. Priority Date: 11/23/1988
  • Status: Expired due to Term
First Claim
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1. A dilatation catheter for relieving an obstructed artery while maintaining a steady flow of blood past the obstruction, comprising:

  • an elongate tubular body;

    a dilatation balloon, secured to said tubular body, said balloon having an upstream end and a downstream end;

    a first conduit extending axially through at least a portion of said elongate tubular body for receiving a guide wire;

    a second conduit concentrically surrounding the first conduit and extending axially through the tubular body for allowing blood flow to bypass the dilatation balloon so that the exterior surface of the wall of said first conduit is radially inwardly spaced apart from the radially inwardly facing surface of the wall of said second conduit;

    a plurality of influent perfusion ports disposed about the periphery of and in fluid communication with said second conduit, said influent perfusion ports disposed upstream from the upstream end of said dilatation balloon so as to enable blood from said artery to enter said second conduit; and

    at least one effluent perfusion port distributed about the periphery of and in fluid communication with said second conduit, said at least one effluent perfusion port disposed downstream from the downstream end of said dilatation balloon so as to conduct blood from said second conduit back into said artery and maintain a steady flow of blood past said dilatation balloon during the dilatation process.

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