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Balloon catheters

  • US 5,160,321 A
  • Filed: 11/27/1991
  • Issued: 11/03/1992
  • Est. Priority Date: 11/23/1988
  • Status: Expired due to Term
First Claim
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1. A dilation catheter for relieving an obstructed coronary artery while maintaining a steady flow of blood past the obstruction, comprising:

  • an axially elongate catheter shaft;

    a guidewire conduit in said catheter shaft;

    a dilatation balloon, secured to said catheter shaft, said dilatation balloon having a proximal end and a distal end;

    an inflation lumen in said catheter shaft for transmitting pressurized fluid into and out of said dilatation balloon, for selective inflation and deflation thereof;

    a perfusion conduit in said catheter shaft for providing a path through which blood may bypass said dilatation balloon when said balloon is in an inflated state and occluding said artery, said perfusion conduit separate from said guidewire conduit, obviating the need to withdraw said guidewire to allow blood to bypass said dilatation balloon;

    a plurality of influent perfusion ports, disposed proximate to the proximal end of said dilatation balloon, said influent ports opening into said perfusion conduit so as to enable blood to enter said perfusion conduit; and

    at least one effluent perfusion port opening into said perfusion conduit, said effluent perfusion port disposed proximate said distal end of said dilatation balloon so as to conduct blood from said perfusion conduit back into said artery and maintain a steady flow of blood past said dilatation balloon during the dilatation process.

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