Tissue diagnosis and treatment using mini-electrodes

  • US 10,524,684 B2
  • Filed: 10/12/2015
  • Issued: 01/07/2020
  • Est. Priority Date: 10/13/2014
  • Status: Active Grant
First Claim
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1. An electrophysiology medical device, comprising:

  • a catheter shaft including a distal end portion;

    a sensing assembly located on the distal end portion, the sensing assembly having three or more terminals;

    wherein the sensing assembly includes one or more current-carrying electrodes and more than one sensing electrodes, wherein a first sensing electrode of the more than one sensing electrodes is spaced apart from the one or more current-carrying electrodes by a first distance, wherein a second sensing electrode of the more than one sensing electrodes is spaced apart from the one or more current-carrying electrodes by a second distance, wherein the first distance is different than the second distance;

    wherein at least one of the one or more current-carrying electrodes and the one or more sensing electrodes includes one or more mini-electrodes and one or more non-mini electrodes;

    wherein at least one of the one or more mini-electrodes is disposed on at least one of the one or more non-mini electrodes; and

    a controller coupled to the sensing assembly, the controller configured todetermine a first potential measurement for the first sensing electrode and a second potential measurement for the second sensing electrode, the first potential measurement being inversely proportional to the first distance and the second potential measurement being inversely proportional to the second distance,determine a scaling factor based on the first distance, the second distance, the first potential measurement, and the second potential measurement, and determine the conductivity of a medium contacting the sensing assembly based on the scaling factor.

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