Temperature controlled short duration ablation

• US 10,292,763 B2
• Filed: 06/10/2016
• Issued: 05/21/2019
• Est. Priority Date: 01/25/2016
• Status: Active Grant

• Current Assignee: Biosense Webster Israel Ltd. (Johnson & Johnson)
• Original Assignee: Biosense Webster Israel Ltd. (Johnson & Johnson)
• Inventors: Govari, Assaf, Ephrath, Yaron, Altmann, Andres Claudio, Zilberman, Israel
• Primary Examiner(s): Cohen, Lee S
• Assistant Examiner(s): Demie, Tigist S
• Application Number:
  US15/179,129
• Publication Number:
  US 20170209209A1
• Time in Patent Office: 1,075 Days
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 18/1492 having a flexible, catheter-like structure, e.g. for heart ablation A61B18/1477 takes precedence
• CPC Class Codes: A61B 2018/00351 Heart
• CPC Class Codes: A61B 2018/00357 Endocardium
• CPC Class Codes: A61B 2018/00577 Ablation
• CPC Class Codes: A61B 2018/00648 using more than one sensed parameter
• CPC Class Codes: A61B 2018/00666 using a threshold value
• CPC Class Codes: A61B 2018/00678 upper
• CPC Class Codes: A61B 2018/00702 Power or energy
• CPC Class Codes: A61B 2018/00714 Temperature
• CPC Class Codes: A61B 2018/00738 Depth, e.g. depth of ablation
• CPC Class Codes: A61B 2018/00744 Fluid flow
• CPC Class Codes: A61B 2018/00755 Resistance or impedance
• CPC Class Codes: A61B 2018/00761 Duration
• CPC Class Codes: A61B 2018/00791 Temperature
• CPC Class Codes: A61B 2018/00797 measured by multiple temperature sensors
• CPC Class Codes: A61B 2018/00875 Resistance or impedance
• CPC Class Codes: A61B 2090/065 for measuring contact or contact pressure
• CPC Class Codes: A61B 2217/007 with irrigation system
• CPC Class Codes: A61B 2218/002 Irrigation

Abstract

A method, including selecting a first maximum radiofrequency (RF) power to be delivered by an electrode within a range of 70 W-100 W, and selecting a second maximum RF power to be delivered by the electrode within a range of 20 W-60 W. The method also includes selecting an allowable force on the electrode within a range of 5 g-50 g, selecting a maximum allowable temperature, of tissue to be ablated, within a range of 55° C.-65° C., and selecting an irrigation rate for providing irrigation fluid to the electrode within a range of 8-45 ml/min. The method further includes performing an ablation of tissue using the selected values by initially using the first power, switching to the second power after a predefined time between 3 s and 6 s, and terminating the ablation after a total time for the ablation between 10 s and 20 s.

Claims

1. A method, comprising:

selecting a first maximum radiofrequency (RF) power to be delivered by an electrode within a range of 70 W-100 W;

selecting a second maximum RF power to be delivered by the electrode within a range of 20 W-60 W;

selecting an allowable force on the electrode within a range of 5 g-50 g;

selecting a maximum allowable temperature, of tissue to be ablated, within a range of 55°

C.-65°

C.;

selecting an irrigation rate for providing irrigation fluid to the electrode within a range of 8=45 ml/min; and

performing an ablation of tissue using the selected values by initially using the first power, switching to the second power after a predefined time between 3 s and 6 s of power delivery at the first power, and terminating the ablation after a total time for the ablation between 10 s and 20 s.

2. The method according to claim 1, and comprising measuring an impedance to an RF power delivered by the electrode during the ablation, and, when a change in the impedance exceeds a preset value, halting the ablation of the tissue.

3. The method according to claim 2, wherein the change is at least 7Ω

.

4. The method according to claim 1, and comprising measuring at respective times a temperature of the tissue, and, when the temperature exceeds the selected maximum allowable temperature, reducing a level of an RF power delivered by the electrode.

5. The method according to claim 4, wherein the temperature of the tissue is measured at a frequency of at least 30 Hz.

6. Apparatus, comprising:

an electrode;

a power control module configured to select a first maximum radiofrequency (RF) power to be delivered by the electrode within a range of 70 W-100 W and to select a second maximum RF power to be delivered by the electrode within a range of 20 W-60 W; and

a processor coupled to the power control module and configured to;

select an allowable force on the electrode within a range of 5 g-50 g;

select a maximum allowable temperature, of tissue to be ablated, within a range of 55°

C.-65°

C.;

select an irrigation rate for providing irrigation fluid to the electrode within a range of 8-45 ml/min; and

perform an ablation of tissue using the selected values by initially using the first power, switching to the second power after a predefined time between 3 s and 6 s of power delivery at the first power, and terminating the ablation after a total time for the ablation between 10 s and 20 s.

7. The apparatus according to claim 6, wherein the processor is configured to measure an impedance to an RF power delivered by the electrode during the ablation, and, when a change in the impedance exceeds a preset value, halt the ablation of the tissue.

8. The apparatus according to claim 7, wherein the change is at least 7Ω

.

9. The apparatus according to claim 6, wherein the processor is configured to measure at respective times a temperature of the tissue, and, when the temperature exceeds the selected maximum allowable temperature, to reduce a level of an RF power delivered by the electrode.

10. The apparatus according to claim 9, wherein the temperature of the tissue is measured at a frequency of at least 30 Hz.