# US 2019/0167346 A1 · Estimating a temperature during ablation

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- Number: US 2019/0167346 A1
- Document ID: US20190167346A1
- Status: Published application
- Kind: A1
- Application number: 16/269,851
- Filed: 2019-02-07
- Published: 2019-06-06
- Earliest claimed: 2015-12-24
- Assignees: Biosense Webster (Israel) Ltd.
- Applicants: Biosense Webster (Israel) Ltd.
- Inventors: Assaf Govari; Yaron Ephrath; Andres Claudio Altmann
- Web page: https://patentgrep.com/patent/US20190167346A1

## CPC

- A61B 18/1492: {having a flexible, catheter-like structure, e.g. for heart ablation (A61B18/1477 takes precedence)}
- A61B 18/1206: {Generators therefor}
- A61B 2018/00011: {with fluids}
- A61B 2018/00029: {open}
- A61B 2018/00351: {Heart}
- A61B 2018/00577: {Ablation}
- A61B 2018/00648: {using more than one sensed parameter}
- A61B 2018/00696: {Controlled or regulated parameters}
- A61B 2018/00702: {Power or energy}
- A61B 2018/00708: {switching the power on or off}
- A61B 2018/00744: {Fluid flow}
- A61B 2018/00791: {Temperature}
- A61B 2018/00797: {measured by multiple temperature sensors}
- A61B 2018/00827: {Current}
- A61B 2018/00863: {Fluid flow}
- A61B 2018/00898: {Alarms or notifications created in response to an abnormal condition}
- A61B 2018/00988: {Means for storing information, e.g. calibration constants, or for preventing excessive use, e.g. usage, service life counter}
- A61B 2218/002: Irrigation
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

A method for use with an intra-body probe, a distal end of which includes an ablation electrode and a temperature sensor, is described. While (i) the ablation electrode is driving an ablating current into tissue of a subject, and (ii) fluid is passed from the distal end of the intra-body probe at a fluid-flow rate, a processor receives a temperature sensed by the temperature sensor. The processor estimates a temperature of the tissue, based at least on the sensed temperature and at least one parameter selected from the group consisting of: the fluid-flow rate, and a parameter of the ablating current. The processor generates an output in response to the estimated temperature. Other embodiments are also described.

## Claims

### Claim 1

A method for use with a probe that includes an ablation electrode and a temperature sensor, the method comprising:
performing a plurality of ablations of tissue, using the ablation electrode;
during each of the ablations, (i) passing a fluid from the probe at a fluid-flow rate, (ii) sensing a temperature, using the temperature sensor, and (iii) measuring a temperature of the tissue; and
from the ablations, learning a relationship between the sensed temperatures and the measured temperatures.

### Claim 2 (depends on 1)

The method according to claim 1, wherein learning the relationship comprises learning the relationship by regressing a variable that is based on the measured temperatures on a variable that is based on the sensed temperatures.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the regressing comprises performing a linear regression.

### Claim 4 (depends on 1)

The method according to claim 1, wherein performing the plurality of ablations comprises performing at least two ablations whose ablation powers differ from each other.

### Claim 5 (depends on 1)

The method according to claim 1, wherein performing the plurality of ablations comprises performing at least two ablations that differ from each other in a force with which the electrode is pressed against the tissue.