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US 12,690,778 B2Granted
Scaling impedance location measurements of a balloon catheter
AssigneeBiosense Webster (Israel) Ltd.
InventorsDoron Moshe Ludwin, Avigdor Rosenberg, Aharon Turgeman, Michael Maydel
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Abstract
A method includes, in a processor, receiving position signals that are indicative of positions of (i) multiple electrodes disposed on an inflatable balloon fitted at a distal end of a catheter, and (ii) first and second electrodes fitted on a shaft of the catheter, on either side of the balloon. The positions of the multiple electrodes disposed on the balloon are calculated based on the received position signals and based on a known distance between the first and second electrodes.
Claims19
A system, comprising:
- a balloon catheter comprising a shaft, an inflatable balloon fitted at a distal end of the shaft, multiple large-area ablation electrodes disposed on the inflatable balloon, first and second small-area sensing electrodes fitted on the shaft, the first small-area sensing electrode proximal of the inflatable balloon and the second small-area sensing electrode distal of the inflatable balloon, and a magnetic sensor fitted on the shaft proximal of the first small-area sensing electrode;
- and
- a processor, which is configured to:
- receive position signals (i) generated as coarse position-signals by the multiple large-area ablation electrodes disposed on the inflatable balloon and (ii) from the first and second small-area sensing electrodes fitted on the shaft;
- receive from the magnetic sensor one or more direction signals indicative of a direction of the distal end, and
- calculate positions of the multiple large-area ablation electrodes disposed on the balloon based on the received signals of positions of (i) the multiple large-area ablation electrodes, and (ii) the first and second small-area sensing electrodes, on the one or more direction signals, and on a known distance between the first and second small-area sensing electrodes, by estimating positions of the first and second small-area sensing electrodes based on the position signals;
- estimating a direction of the catheter distal end based on the one or more direction signals;
- based on the known distance between the first and second small-area sensing electrodes, calculating displacements of the first and second small-area sensing electrodes such that the first and second small-area sensing electrodes are brought into correct positions along the direction of the catheter distal end;
- and
- scaling the positions of the multiple large-area ablation electrodes based on the calculated displacements.
7 more elements
A method, comprising:
- generating electrical excitation energy around a patient's organ;
- generating a magnetic field around a patient's organ;
- and in a processor,
- receiving position signals generated by multiple large-area ablation electrodes in response to the electrical excitation energy, the multiple large-area ablation electrodes disposed on an inflated balloon fitted at a distal end of a catheter;
- receiving additional position signals generated by first and second small-area sensing electrodes in response to the electrical excitation energy, the first and second small-area sensing electrodes fitted on a shaft of the catheter, the first small-area sensing electrode being proximal of the balloon, the second small-area sensing electrode being distal of the balloon;
- based on the position signals and the additional position signals, determining positions of the multiple large-area ablation electrodes in a coordinate system that includes the patient's organ, by;
- receiving a direction signal generated by a magnetic sensor in response to the magnetic field, the magnetic sensor fitted on the shaft and proximal of the first small-area sensing electrode, the direction signal representative of a direction to which a distal end of the shaft points;
- and
- applying corrective displacements, including adjusting the direction of the distal end of the shaft in the coordinate system based on the direction signal and adjusting the positions of the multiple large-area ablation electrodes in the coordinate system based on a scaling factor.
6 more elements
A system, comprising:
- a balloon catheter comprising:
- a shaft,
- an inflatable balloon fitted at a distal end of the shaft,
- multiple large-area ablation electrodes disposed on the inflatable balloon,
- first and second small-area sensing electrodes fitted on the shaft, the first small-area sensing electrode proximal of the inflatable balloon, the second small-area sensing electrode distal of the inflatable balloon, and
- a magnetic sensor fitted on the shaft, proximal of the first small-area sensing electrode;
- a processor configured to:
- receive position signals generated by the multiple large-area ablation electrodes in response to electrical excitation energy;
- receive additional position signals generated by the first and second small-area sensing electrodes in response to the electrical excitation energy;
- based on the position signals and the additional position signals, determine positions of the multiple large-area ablation electrodes within a coordinate system that includes a patient's organ, by;
- receiving a direction signal generated by the magnetic sensor, the direction signal representative of a direction to which a distal end of the shaft points;
- and
- applying corrective displacements, including adjusting the direction of the distal end of the shaft in the coordinate system based on the direction signal and adjusting the positions of the multiple large-area ablation electrodes in the coordinate system based on a scaling factor.
10 more elements
Dependencies are inferred from the claim text.