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Renal denervation catheter with cooled RF electrode

  • US 9,192,435 B2
  • Filed: 11/22/2011
  • Issued: 11/24/2015
  • Est. Priority Date: 11/22/2010
  • Status: Expired due to Fees
First Claim
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1. An apparatus, comprising:

  • a catheter comprising a flexible shaft having a proximal end, a distal end, a lumen arrangement comprising a coolant lumen extending between the proximal and distal ends, anda length sufficient to access a patient'"'"'s renal artery relative to a percutaneous access location;

    a conductor arrangement extending between the proximal and distal ends of the shaft; and

    an electrode arrangement coupled to the conductor arrangement and provided at the distal end of the shaft, the electrode arrangement dimensioned for deployment within the renal artery and comprising;

    a plurality of electrodes positioned on the distal end of the shaft in a spaced relationship, each of the electrodes comprising;

    a protuberance that extends out a distance beyond an outer surface of the distal end of the shaft, the protuberance defining a tissue contacting surface and an opposing blood contacting surface, wherein the coolant lumen comprises a continuous tube that passes through a channel in the protuberance;

    wherein the electrodes have a substantially spherical shape and a diameter greater than that of the distal end of the shaft;

    wherein the electrode arrangement comprises;

    electrically insulating material disposed between adjacent electrodes to electrically isolate the electrodes from one another; and

    electrically insulating material disposed on an outer the blood contacting surface of each of the electrodes protuberances configured to face away from a wall of the renal artery and an integral cooling arrangement fluidly coupled to the coolant lumen of the lumen arrangement, the coolant lumen and integral cooling arrangement configured to receive a biocompatible thermal transfer fluid;

    and wherein at least one of the integral cooling arrangement and the distal end of the coolant lumen is configured to expel spent thermal transfer fluid into a blood stream of the renal artery.

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