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Telescoping guide catheter system

  • US 5,120,323 A
  • Filed: 07/11/1991
  • Issued: 06/09/1992
  • Est. Priority Date: 01/12/1990
  • Status: Expired due to Term
First Claim
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1. A method of performing recanalization of a stenosed coronary artery of interest comprising the steps of:

  • introducing a first elongated, hollow, flexible, plastic, relatively large diameter, reinforced-wall torque-transmitting guide catheter having a proximal end and a distal end at a predetermined location in the vascular system and advancing the first guide catheter until the distal end thereof reaches the coronary ostia;

    inserting a second, elongated, hollow, flexible, plastic, relatively smaller diameter unreinforced guide catheter having a tubular core a polytetrafluoroethylene polymeric material sheathed in an outer cylindrical coating of a second polymeric material and a distal tip member of a material of relatively low durometer relative to the other materials of the second guide catheter affixed to the distal end of the second guide catheter, wherein the tip member is further characterized by a distal end shaped to encounter and minimize damage to the endothelial lining of coronary artery of interest by the advancing second guide catheter;

    advancing the second guide catheter until the distal end of the second catheter passes beyond the distal end of the first guide catheter and into the coronary artery of interest adjacent the stenosis to be canalized;

    slidably introducing a working catheter having a proximal end and a distal end into the hollow tubular core of the second guide catheter and advancing the working catheter therealong until the distal end of the working catheter passes through and extends beyond the distal end of the second guide catheter and into the stenosed area of the coronary artery of interest; and

    using the working catheter to accomplish recanalization.

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