# US 10,307,206 B2 · Temperature controlled short duration ablation

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- Number: US 10,307,206 B2
- Document ID: US10307206B2
- Status: Granted
- Kind: B2
- Application number: 15/179,196
- Filed: 2016-06-10
- Published: 2017-07-27
- Granted: 2019-06-04
- Earliest claimed: 2016-01-25
- Assignees: Biosense Webster (Israel) Ltd.
- Applicants: Biosense Webster (Israel) Ltd.
- Inventors: Assaf Govari; Yaron Ephrath; Andres Claudio Altmann; Israel Zilberman
- Web page: https://patentgrep.com/patent/US10307206B2

## CPC

- A61B 18/1492: {having a flexible, catheter-like structure, e.g. for heart ablation (A61B18/1477 takes precedence)}
- A61B 2018/00029: {open}
- A61B 2018/00351: {Heart}
- A61B 2018/00357: {Endocardium}
- A61B 2018/00577: {Ablation}
- A61B 2018/00642: {with feedback, i.e. closed loop control}
- A61B 2018/00666: {using a threshold value}
- A61B 2018/00678: {upper}
- A61B 2018/00702: {Power or energy}
- A61B 2018/00708: {switching the power on or off}
- A61B 2018/00714: {Temperature}
- A61B 2018/00791: {Temperature}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## 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

### Claim 1

A method, comprising:
performing an ablation procedure on biological tissue using radiofrequency (RF) power by delivering a first level of RF power to the tissue;
measuring at respective times a temperature of the tissue; and
when the temperature exceeds a preset maximum allowable temperature, reducing the RF power by delivering a second level of RF power to the tissue,
wherein the first level of RF power is in a range of 70 W-100 W, and the second level of RF power is in a range of 20 W-60 W.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the temperature of the tissue is measured at a frequency of at least 30 Hz.

### Claim 3 (depends on 1)

The method of claim 1, further comprising:
measuring an impedance to the RF power during the procedure; and
when a change in the impedance exceeds a preset value, halting supply of the RF power to the tissue.

### Claim 4 (depends on 3)

The method of claim 3, wherein the change is at least 7Ω.

### Claim 5 (depends on 1)

The method of claim 1, wherein the delivery of the RF power further comprises:
a first time period during which the first level of RF power is operative for 1 s to 6 s and a second time period during which the second level of RF power is operative for up to 14 s.

### Claim 6 (depends on 1)

The method of claim 1, further comprising a delivery of the RF power, wherein the RF power is operative for an overall time period of 1 s to 20 s.

### Claim 7

A method, comprising:
performing an ablation procedure on biological tissue using radiofrequency (RF) power;
measuring at respective times a temperature of the tissue; and
when the temperature exceeds a preset maximum allowable temperature, reducing a level of the RF power supplied to the tissue according to the following equations:
ΔP=min(ΔP(T),ΔP(p)),
where ΔP(T)=(a(Tt-1−Tt)/T)+(b(Tt-1−Tt)/T), and
where ΔP(p)=(P−Pt)/P.

### Claim 8 (depends on 7)

The method of claim 7, wherein a=10 and b=1.

### Claim 9

Apparatus, comprising:
a power control module configured to perform an ablation procedure on biological tissue using radiofrequency (RF) power; and
a processor configured to:
deliver to the tissue a first level of RF power supplied by the power control module;
measure at respective times a temperature of the tissue; and
when the temperature exceeds a preset maximum allowable temperature, reduce the RF power supplied to the tissue by the power control module to the tissue by delivering a second level of RF power,
wherein the first level of RF power is in a range of 70 W-100 W, and the second level of RF power is in a range of 20 W-60 W.

### Claim 10 (depends on 9)

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

### Claim 11 (depends on 9)

The apparatus of claim 9, wherein the processor is configured to
measure an impedance to the RF power during the procedure; and
when a change in the impedance exceeds a preset value, halt supply of the RF power to the tissue.

### Claim 12 (depends on 11)

The apparatus of claim 11, wherein the change is at least 7Ω.

### Claim 13 (depends on 9)

The apparatus of claim 9, wherein the processor is configured to deliver the RF power in a first time period during which the first level of RF power is operative for 1 s to 6 s and a second time period during which the second level of RF power is operative for up to 14 s.

### Claim 14 (depends on 9)

The apparatus of claim 9, wherein the processor is configured to deliver the RF power in an overall time period of 1 s to 20 s.

### Claim 15

Apparatus, comprising:
a power control module configured to perform an ablation procedure on biological tissue using radiofrequency (RF) power; and
a processor configured to:
deliver to the tissue a first level of RF power supplied by the power control module;
measure at respective times a temperature of the tissue; and
when the temperature exceeds a preset maximum allowable temperature, reduce the RF power supplied to the tissue by the power control module to the tissue according to the following equation:
ΔP=min(ΔP(T),ΔP(p)),
where ΔP(T)=(a(Tt-1−Tt)/T)+(b(Tt-1−Tt)/T), and
where ΔP(p)=(P−Pt)/P.

### Claim 16 (depends on 15)

The apparatus of claim 15, wherein a=10 and b=1.

### Claim 17 (depends on 15)

The apparatus of claim 15, wherein the processor is further configured to:
measure an impedance to the RF power during the procedure, and
when a change in the impedance exceeds a preset value, halt supply of the RF power to the tissue.

### Claim 18 (depends on 17)

The apparatus of claim 17, wherein the change is at least 7Ω.

### Claim 19 (depends on 15)

The apparatus of claim 15, wherein the first level of RF power is operative for 1 s to 6 s and a second level of RF power is operative for up to 14 s.

### Claim 20 (depends on 15)

The apparatus of claim 15, wherein the processor is configured to deliver the RF power in an overall time period of 1 s to 20 s.