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Ablation probe with deployable electrodes

  • US 8,109,926 B2
  • Filed: 09/14/2007
  • Issued: 02/07/2012
  • Est. Priority Date: 09/14/2006
  • Status: Active Grant
First Claim
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1. A method of delivering an electric field to a target tissue, comprising:

  • advancing an ablation probe comprising a delivery member into a tissue of a patient, the delivery member having a long axis;

    deploying a plurality of electrodes at least partially around a current flow center to substantially define a treatment volume, wherein defining the treatment volume comprises;

    (i) deploying a guide microtube from a sidewall opening of the delivery member that penetrates into tissue along a guide tissue penetration path, the guide path curving in a first direction, wherein curving of the guide in the first direction directs advancement of the guide distally and away from the delivery member long axis, the guide microtube comprising a resilient, shape memory material configured to direct microtube advancement along the guide tissue penetration path;

    (ii) deploying an electrode from the guide microtube along an electrode tissue penetration path, the electrode path curving in a second direction, wherein curving of the electrode in the second direction directs advancement of the electrode distally, and parallel to or toward the delivery member long axis; and

    establishing current flow extending within the target tissue in a plurality of different directions through the treatment volume using the deployed electrode.

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