Devices and methods for treating lung tumors

  • US 10,842,560 B2
  • Filed: 07/24/2019
  • Issued: 11/24/2020
  • Est. Priority Date: 09/08/2017
  • Status: Active Grant
First Claim
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1. An ablation catheter assembly configured to ablate tissue in a lung of a patient, the ablation catheter assembly comprising:

  • a flexible shaft configured to advance endobronchially into an airway of the lung, wherein the flexible shaft has an outer diameter no greater than 2.0 mm;

    an ablation electrode attached to a distal portion of the flexible shaft and configured to deliver radiofrequency (RF) electrical current to the tissue, wherein the ablation electrode is conductively connectable to an RF electrical energy source external to the patient, wherein an outer diameter of an assembly of the flexible shaft and the ablation electrode is no greater than 2.0 mm;

    a liquid outlet on the distal portion and configured to be in fluid communication with a source of hypertonic saline solution;

    a first occluder attached to the flexible shaft proximal to the ablation electrode and proximal to the liquid outlet, wherein the first occluder is configured to expand to occlude the airway;

    a suction opening at the distal portion of the flexible shaft, wherein the suction opening is in fluid communication with a vacuum;

    a second electrode on the flexible shaft between the ablation electrode and the first occluder;

    an impedance monitoring circuit configured to measure an impedance between the ablation electrode and the second electrode; and

    a controller configured to automatically stop suction through the suction opening in response to a reduction of at least five percent in an impedance between the ablation electrode and the second electrode.

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