Estimating a temperature during ablation

Patent metadata

Field	Value
Publication number	US-10575901-B2
Application number	US-201615385231-A
Country	US
Kind code	B2
Filing date	Dec 20, 2016
Priority date	Dec 24, 2015
Publication date	Mar 3, 2020
Grant date	Mar 3, 2020

Abstract

Described embodiments include an apparatus that includes an electrical interface and a processor. The processor is configured to receive, via the electrical interface, a temperature sensed by a temperature sensor at a distal end of an intrabody probe, to estimate a temperature of tissue of a subject, based on the sensed temperature and a parameter of an ablating current driven, by an ablation electrode at the distal end of the intrabody probe, into the tissue, and to generate an output in response to the estimated temperature. Other embodiments are also described.

First claim

The invention claimed is:

1. Apparatus, comprising:
an electrical interface; and
a processor, configured:
to receive, via the electrical interface, a temperature sensed by a temperature sensor at a distal end of an intrabody probe,
to estimate a temperature of tissue of a subject, based on the sensed temperature and a parameter of an ablating current driven, by an ablation electrode at the distal end of the intrabody probe, into the tissue, the processor being configured to estimate the temperature of the tissue by selecting a coefficient in response to the parameter and multiplying, by the coefficient, a value that is based on the sensed temperature, the estimated temperature of the tissue being T 0 +α(T I −T 0 ), T I being the sensed temperature, α being the coefficient, and T 0 being a quantity based on a temperature T_ 0 that was sensed by the temperature sensor prior to the driving of the ablating current; and
to generate an output in response to the estimated temperature.

2. The apparatus according to claim 1 , wherein the parameter includes a power of the ablating current.

3. The apparatus according to claim 1 , wherein the parameter includes an amplitude of the ablating current.

4. The apparatus according to claim 1 , wherein the processor is further configured to compute T 0 as T_ 0 −β, β being a correction factor that depends on a stability of temperatures sensed by the temperature sensor prior to the driving of the ablating current.

5. The apparatus according to claim 1 , wherein the processor is configured to select the coefficient by computing the coefficient.

6. The apparatus according to claim 5 , wherein the processor is configured to compute the coefficient by substituting the parameter into a closed-form expression for the coefficient.

7. A method, comprising:
receiving, by a processor, a temperature sensed by a temperature sensor at a distal end of an intrabody probe;
estimating, by the processor, a temperature of tissue of a subject, based on the sensed temperature and a parameter of an ablating current driven, by an ablation electrode at the distal end of the intrabody probe, into the tissue, including selecting a coefficient in response to the parameter and estimating the temperature of the tissue by multiplying, by the coefficient, a value that is based on the sensed temperature given by T 0 +α(T I −T 0 ), T I being the sensed temperature, α being the coefficient, and T 0 being a quantity based on a temperature T_ 0 that was sensed by the temperature sensor prior to the driving of the ablating current; and
generating an output in response to the estimated temperature.

8. The method according to claim 7 , wherein the parameter includes a power of the ablating current.

9. The method according to claim 7 , wherein the parameter includes an amplitude of the ablating current.

10. The method according to claim 7 , further comprising computing T 0 as T_ 0 −β, β being a correction factor that depends on a stability of temperatures sensed by the temperature sensor prior to the driving of the ablating current.

11. The method according to claim 7 , wherein selecting the coefficient comprises selecting the coefficient by computing the coefficient.

12. The method according to claim 11 , wherein computing the coefficient comprises computing the coefficient by substituting the parameter into a closed-form expression for the coefficient.

Assignees

• Biosense Webster Israel Ltd

Inventors

• Govari Assaf
• Altmann Andres Claudio
• Pressman Assaf
• Berman Dror

Classifications

• A61B2017/00057

  Light · CPC title

• A61B2018/00779

  Power or energy · CPC title

• A61B2218/002

  Irrigation · CPC title

• A61B18/1492 Primary

  having a flexible, catheter-like structure, e.g. for heart ablation (A61B18/1477 takes precedence) · CPC title

• A61B2018/00791

  Temperature · CPC title