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US 11,432,872 B2Granted
Energy-guided radiofrequency (RF) ablation
AssigneeBiosense Webster (Israel) Ltd.
InventorsAssaf Govari, Andres Claudio Altmann, Ella Ozeri
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Abstract
A method of body tissue ablation includes defining a target amount of ablation energy needed to create a specified lesion in tissue in a body of a patient. Contact is made between an ablation probe and the tissue. Using the ablation probe, an ablation signal is applied to the tissue, which delivers the target amount of ablation energy during a smallest time duration permitted within a defined maximum-power constraint.
Claims19
A method of body tissue ablation, the method comprising:
- a) setting ablation parameters needed to create a specified lesion in tissue in a body of a patient using an ablation probe having an electrode, the ablation parameters comprising a target amount of ablation energy, a predetermined temperature range of the tissue, a range of power to be delivered to the electrode, the range including a maximum power level, and a preset period of time;
- b) determining that an impedance of the electrode does not exceed a preset impedance value;
- c) applying an ablation signal to the tissue to deliver the target amount of ablation energy during a smallest time duration within the preset period of time using the maximum power level;
- d) modifying an irrigation flow rate in response to a determination that a monitored tissue temperature equals or exceeds a maximum temperature within the preset temperature range;
- e) modifying the power in response to a determination that the monitored tissue temperature equals or exceeds the maximum temperature after modifying the irrigation flow rate;
- f) discontinuing the ablation signal in response to one of:
- i) a determination that the monitored tissue temperature equals or exceeds the maximum temperature after modifying the irrigation flow rate and power,
- ii) a determination that the monitored tissue temperature does not equal or exceed the maximum temperature after one of modifying the irrigation flow rate or power and a determination that the target amount of ablation energy has been achieved, or
- iii) a determination that the monitored tissue temperature does not equal or exceed the maximum temperature after one of modifying the irrigation flow rate or power, a determination that the target amount of ablation energy has not been achieved and a determination that the preset period of time has been exceeded;
- and
- g) returning to step b) if the ablation is not discontinued pursuant to step f).
8 more elements
A system comprising:
- one or more processors;
- and
- a non-transitory computer readable medium storing a plurality of instructions, which when executed, cause the one or more processors to:
- a) set ablation parameters needed to create a specified lesion in tissue in a body of a patient using an ablation probe having an electrode, the ablation parameters comprising a target amount of ablation energy, a predetermined temperature range of the tissue, a range of power to be delivered to the electrode, the range including a maximum power level, and a preset period of time;
- b) determine that an impedance of the electrode does not exceed a preset impedance value;
- c) apply an ablation signal to the tissue to deliver the target amount of ablation energy during a smallest time duration within the preset period of time using the maximum power level;
- d) modify an irrigation flow rate in response to a determination that a measured tissue temperature equals or exceeds a maximum temperature within the preset temperature range;
- e) modify the power in response to a determination that the measured tissue temperature equals or exceeds the maximum temperature after modifying the irrigation flow rate;
- f) discontinue the ablation signal in response to one of:
- i) a determination that the measured tissue temperature equals or exceeds the maximum temperature after modifying the irrigation flow rate and power,
- ii) a determination that the measured tissue temperature does not equal or exceed the maximum temperature after one of modifying the irrigation flow rate or power and a determination that the target amount of ablation energy has been achieved, or
- iii) a determination that the measured tissue temperature does not equal or exceed the maximum temperature after one of modifying the irrigation flow rate or power, a determination that the target amount of ablation energy has not been achieved and a determination that the preset period of time has been exceeded;
- and
- g) return to step b) if the ablation is not discontinued pursuant to step f).
11 more elements
A computer program product, comprising a non-transitory computer-readable medium having computer-readable program code embodied therein to be executed by one or more processors, the program code including instructions to:
- a) set ablation parameters needed to create a specified lesion in tissue in a body of a patient using an ablation probe having an electrode, the ablation parameters comprising a target amount of ablation energy, a predetermined temperature range of the tissue, a range of power to be delivered to the electrode, the range including a maximum power level, and a preset period of time;
- b) determine that an impedance of the electrode does not exceed a preset impedance value;
- c) apply an ablation signal to the tissue to deliver the target amount of ablation energy during a smallest time duration within the preset period of time using the maximum power level;
- d) modify an irrigation flow rate in response to a determination that a measured tissue temperature equals or exceeds a maximum temperature within the preset temperature range;
- e) modify the power in response to a determination that the measured tissue temperature equals or exceeds the maximum temperature after modifying the irrigation flow rate;
- f) discontinue the ablation signal in response to one of:
- i) a determination that the measured tissue temperature equals or exceeds the maximum temperature after modifying the irrigation flow rate and power,
- ii) a determination that the measured tissue temperature does not equal or exceed the maximum temperature after one of modifying the irrigation flow rate or power and a determination that the target amount of ablation energy has been achieved, or
- iii) a determination that the measured tissue temperature does not equal or exceed the maximum temperature after one of modifying the irrigation flow rate or power, a determination that the target amount of ablation energy has not been achieved and a determination that the preset period of time has been exceeded;
- and
- g) return to step b) if the ablation is not discontinued pursuant to step f).
8 more elements
Dependencies are inferred from the claim text.