System and method for assessing the formation of a lesion in tissue
First Claim
1. A system for assessing tissue of an anatomical structure during an ablation procedure, the system comprising:
- an elongate medical device comprising;
at least one sensing element configured for sensing contact of the elongate medical device with the tissue, andat least one electrode configured for sensing at least one component of a complex impedance between the at least one electrode and the tissue; and
an electronic control unit (ECU) configured to;
acquire a signal from the sensing element to confirm that the elongate medical device is in contact with the tissue;
acquire a power magnitude associated with a power applied to the tissue;
acquire magnitudes for a plurality of components of the complex impedance between the at least one electrode and the tissue; and
calculate a value responsive to;
(a) the signal from the sensing element; and
(b) a coupling index calculated based on the power magnitude, the magnitudes of the plurality of components of the complex impedance, and the signal from the sensing element, said value indicative of one of a predicted depth of a lesion in the tissue, a likelihood of the lesion having a predetermined depth in the tissue and a predicted temperature of the tissue, wherein the coupling index is indicative of a degree of coupling between the at least one electrode and the tissue.
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Accused Products
Abstract
A method and system for assessing lesion formation in tissue is provided. The system includes an electronic control unit (ECU) configured to acquire magnitudes for a component of a complex impedance between an electrode and tissue, and the power applied to the tissue during lesion formation. The ECU is configured to calculate a value responsive to the complex impedance component and the power. The value is indicative of a predicted lesion depth, a likelihood the lesion has reached a predetermined depth, or a predicted tissue temperature. The method includes acquiring magnitudes for a component of a complex impedance between an electrode and tissue and the power applied during lesion formation. The method includes calculating a value responsive to the complex impedance component and the power, the value being indicative of a predicted lesion depth, a likelihood the lesion has reached a predetermined depth, and/or a predicted tissue temperature.
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Citations
23 Claims
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1. A system for assessing tissue of an anatomical structure during an ablation procedure, the system comprising:
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an elongate medical device comprising; at least one sensing element configured for sensing contact of the elongate medical device with the tissue, and at least one electrode configured for sensing at least one component of a complex impedance between the at least one electrode and the tissue; and an electronic control unit (ECU) configured to; acquire a signal from the sensing element to confirm that the elongate medical device is in contact with the tissue; acquire a power magnitude associated with a power applied to the tissue; acquire magnitudes for a plurality of components of the complex impedance between the at least one electrode and the tissue; and calculate a value responsive to; (a) the signal from the sensing element; and (b) a coupling index calculated based on the power magnitude, the magnitudes of the plurality of components of the complex impedance, and the signal from the sensing element, said value indicative of one of a predicted depth of a lesion in the tissue, a likelihood of the lesion having a predetermined depth in the tissue and a predicted temperature of the tissue, wherein the coupling index is indicative of a degree of coupling between the at least one electrode and the tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus for assessing tissue during an ablation procedure using an ablation catheter, the apparatus comprising:
an electronic control unit (ECU) configured to; acquire a power magnitude associated with a power applied to the tissue; acquire a plurality of components of a complex impedance between an electrode of the catheter and the tissue; acquire a signal indicating whether the catheter is in contact with the tissue; calculate a value based on the power magnitude, the plurality of components of the complex impedance, and the signal indicating whether the catheter is in contact with the tissue, wherein the value is indicative of one of a predicted depth of a lesion in the tissue, a likelihood of the lesion having a predetermined depth in the tissue and a predicted temperature of the tissue; and output the value to a display device.
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15. A method for assessing tissue of an anatomical structure during an ablation procedure using an ablation catheter, the method comprising:
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acquiring a signal from a sensing element of the catheter to confirm that the catheter is in contact with the tissue, wherein the signal from the sensing element is a force signal indicating a force of the catheter against the tissue; acquire a plurality of components of a complex impedance between at least one electrode and the tissue; acquiring magnitudes for the plurality of components of a complex impedance between the at least one electrode of the catheter and the tissue; acquiring a magnitude for an applied power; calculating a value responsive to; (a) the force signal and at least one component of the complex impedance; and (b) a coupling index calculated based on the power magnitude, the magnitudes of the plurality of components of the complex impedance, and the force signal indicating the force of the catheter against the tissue, said value indicative of one of a predicted depth of a lesion in the tissue, a likelihood of the lesion having a predetermined depth in the tissue and a predicted temperature of the tissue, wherein the coupling index is indicative of a degree of coupling between the at least one electrode and the tissue; and outputting the value to a display device. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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Specification