Ablation system and method of use
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Abstract
A system and method for creating lesions and assessing their completeness or transmurality. Assessment of transmurality of a lesion is accomplished by monitoring the depolarization signal in a local electrogram taken using electrodes located adjacent the tissue to be ablated. Following onset of application of ablation energy to heart tissue, the local electrogram is measured with electrodes located adjacent tissue to be ablated so that the ablation energy to ablation elements can be selectively reduced or terminated when transmurality is detected.
119 Citations
52 Claims
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1-19. -19. (canceled)
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20. An ablation system, comprising:
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a generator for generating ablation energy;
an ablation device comprising an ablation element operably coupled to the generator and locatable adjacent a tissue site to be ablated, for applying ablation energy to the tissue site;
an electrogram measurement element mounted to the ablation device so that the electrogram measurement element is adjacent the tissue site when the ablation element is adjacent the tissue site;
electrogram amplitude measurement circuitry operably coupled to the electrogram measurement element to measure electrogram amplitude at the tissue site, using the electrogram measurement element; and
control circuitry operably coupled to the generator to initiate and terminate the application of ablation energy to the ablation element, wherein the control circuitry is operably coupled to the electrogram amplitude measurement circuit and terminates application of ablation energy to the ablation element responsive to occurrence of a plateau in the electrogram amplitude measured by the electrogram amplitude measurement circuitry following initiation of application of ablation energy to the ablating element. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An ablation system, comprising:
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a generator for generating ablation energy;
an ablation device comprising an ablation element operably coupled to the generator and locatable adjacent a tissue site to be ablated, for applying ablation energy to the tissue site;
an electrogram measurement element mounted to the ablation device so that the electrogram measurement element is adjacent the tissue site when the ablation element is adjacent the tissue site;
electrogram amplitude measurement circuitry operably coupled to the electrogram measurement element to measure electrogram amplitude at the tissue site, using the electrogram measurement element; and
control circuitry operably coupled to the generator to initiate and terminate the application of ablation energy to the ablation element, wherein the control circuitry is operably coupled to the electrogram amplitude measurement circuit and reduces the level of ablation energy to the ablation element responsive to occurrence of a rapid drop in the electrogram amplitude measured by the electrogram amplitude measurement circuitry following initiation of application of ablation energy to the ablating element. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. An ablation system, comprising:
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a generator for generating ablation energy;
an ablation device comprising an ablation element operably coupled to the generator and locatable adjacent a tissue site to be ablated, for applying ablation energy to the tissue site;
an electrogram measurement element mounted to the ablation device so that the electrogram measurement element is adjacent the tissue site when the ablation element is adjacent the tissue site;
electrogram amplitude measurement circuitry operably coupled to the electrogram measurement element to measure electrogram amplitude at the tissue site, using the electrogram measurement element; and
control circuitry operably coupled to the generator to initiate and terminate the application of ablation energy to the ablation element, wherein the control circuitry is operably coupled to the electrogram amplitude measurement circuit and terminates the application of ablation energy to the ablation element responsive to occurrence of a drop in the electrogram amplitude measured by the electrogram amplitude measurement circuitry following initiation of application of ablation energy to the ablating element. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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Specification