System and method for assessing the formation of a lesion in tissue
First Claim
1. A system for assessing the formation of a lesion in a tissue as a result of an ablation procedure being performed on said tissue, comprising:
- an electronic control unit (ECU) configured to;
acquire a magnitude for the power applied to said tissue during the formation of said lesion in said tissue; and
acquire magnitudes for a plurality of components of a complex impedance between an electrode and said tissue, wherein said plurality of components of said complex impedance comprise;
a reactance between said electrode and said tissue at a point in time for which said value is to be calculated;
a resistance between said electrode and said tissue at a point in time for which said value is to be calculated;
an impedance between said electrode and said tissue at a point in time for which said value is to be calculated;
a first pre-ablation phase angle between said electrode and said tissue prior to said electrode contacting said tissue; and
a second pre-ablation phase angle between said electrode and said tissue following contact between said electrode and said tissue; and
calculate a value responsive to said magnitudes of said plurality of components of said complex impedance and said power, said value indicative of one of a predicted depth of said lesion in said tissue, a likelihood of said lesion having a predetermined depth in said tissue, and a predicted temperature of said 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.
202 Citations
26 Claims
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1. A system for assessing the formation of a lesion in a tissue as a result of an ablation procedure being performed on said tissue, comprising:
an electronic control unit (ECU) configured to; acquire a magnitude for the power applied to said tissue during the formation of said lesion in said tissue; and acquire magnitudes for a plurality of components of a complex impedance between an electrode and said tissue, wherein said plurality of components of said complex impedance comprise; a reactance between said electrode and said tissue at a point in time for which said value is to be calculated; a resistance between said electrode and said tissue at a point in time for which said value is to be calculated; an impedance between said electrode and said tissue at a point in time for which said value is to be calculated; a first pre-ablation phase angle between said electrode and said tissue prior to said electrode contacting said tissue; and a second pre-ablation phase angle between said electrode and said tissue following contact between said electrode and said tissue; and calculate a value responsive to said magnitudes of said plurality of components of said complex impedance and said power, said value indicative of one of a predicted depth of said lesion in said tissue, a likelihood of said lesion having a predetermined depth in said tissue, and a predicted temperature of said tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for assessing the formation of a lesion in a tissue as a result of an ablation procedure being performed on said tissue, comprising the steps of
acquiring a magnitude for the power applied to said tissue during the formation of said lesion in said tissue; - and
acquiring magnitudes for a plurality of components of a complex impedance between an electrode and said tissue, wherein said plurality of components of said complex impedance comprise; a reactance between said electrode and said tissue at a point in time for which said value is to be calculated; a resistance between said electrode and said tissue at a point in time for which said value is to be calculated; an impedance between said electrode and said tissue at a point in time for which said value is to be calculated; a first pre-ablation phase angle between said electrode and said tissue prior to said electrode contacting said tissue; and a second pre-ablation phase angle between said electrode and said tissue following contact between said electrode and said tissue; and calculating a value responsive to said magnitudes of said plurality of components of said complex impedance and said power, said value indicative of one of a predicted depth of said lesion in said tissue, a likelihood of said lesion having a predetermined depth in said tissue, and a predicted temperature of said tissue. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. An automated guidance system, comprising:
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a catheter manipulator assembly; a catheter associated with said catheter manipulator assembly, said catheter including an electrode associated therewith configured to deliver RF power to a tissue in a body; and a controller configured to control at least one of the movement of the catheter and the delivery of RF power to said tissue by said electrode in response to a value indicative of one of a predicted lesion depth in said tissue, a likelihood of said lesion having a predetermined depth in said tissue, and a predicted temperature of said tissue calculated from a magnitude of RF power applied to said tissue during the formation of a lesion in said tissue, and magnitudes for a plurality of components of a complex impedance between said electrode and said tissue, wherein said plurality of components of said complex impedance comprise; a reactance between said electrode and said tissue at a point in time for which said value is to be calculated; a resistance between said electrode and said tissue at a point in time for which said value is to be calculated; an impedance between said electrode and said tissue at a point in time for which said value is to be calculated; a first pre-ablation phase angle between said electrode and said tissue prior to said electrode contacting said tissue; and a second pre-ablation phase angle between said electrode and said tissue following contact between said electrode and said tissue.
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Specification