Systems and methods for lesion assessment
First Claim
Patent Images
1. A method for monitoring ablation of cardiac tissue of endocardium comprising:
- applying ablation energy to a cardiac tissue to form a lesion in the tissue;
illuminating the cardiac tissue to excite nicotinamide adenine dinucleotide hydrogen (NADH) in the cardiac tissue and determining a base level of NADH fluorescence in the illuminated cardiac tissue;
monitoring a level of NADH fluorescence in the illuminated cardiac tissue during the application of ablation energy to the illuminated cardiac tissue;
reducing the NADH fluorescence in the illuminated cardiac tissue to between 60% and 80% of the base level and achieving a steady state NADH fluorescence; and
upon achieving the steady state NADH fluorescence for between 5 and 10 seconds, stopping ablation of the illuminated cardiac tissue to limit an amount of ablation energy delivered to the cardiac tissue.
3 Assignments
0 Petitions
Accused Products
Abstract
Ablation visualization and monitoring systems and methods are provided. In some embodiments, such methods comprise applying ablation energy to a tissue to form a lesion in the tissue, illuminating the tissue with a light to excite NADH in the tissue, wherein the tissue is illuminated in a radial direction, an axial direction, or both, monitoring a level of NADH fluorescence in the illuminated tissue to determine when the level of NADH fluorescence decreases from a base level in the beginning of the ablating to a predetermined lower level, and stopping ablation of the tissue when the level of NADH fluorescence reaches the predetermined lower level.
-
Citations
34 Claims
-
1. A method for monitoring ablation of cardiac tissue of endocardium comprising:
-
applying ablation energy to a cardiac tissue to form a lesion in the tissue; illuminating the cardiac tissue to excite nicotinamide adenine dinucleotide hydrogen (NADH) in the cardiac tissue and determining a base level of NADH fluorescence in the illuminated cardiac tissue; monitoring a level of NADH fluorescence in the illuminated cardiac tissue during the application of ablation energy to the illuminated cardiac tissue; reducing the NADH fluorescence in the illuminated cardiac tissue to between 60% and 80% of the base level and achieving a steady state NADH fluorescence; and upon achieving the steady state NADH fluorescence for between 5 and 10 seconds, stopping ablation of the illuminated cardiac tissue to limit an amount of ablation energy delivered to the cardiac tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A system for monitoring tissue ablation comprising:
-
a catheter comprising; a catheter body; and a distal tip positioned at a distal end of the catheter body, the distal tip having one or more openings for passing light energy to a cardiac tissue of endocardium; an ablation system in communication with the distal tip to deliver ablation energy to the distal tip; a visualization system comprising a light source, a light measuring instrument, and one or more optical fibers in communication with the light source and the light measuring instrument and extending through the catheter body to the distal tip, wherein the one or more optical fibers are configured to pass light energy to the cardiac tissue to illuminate the cardiac tissue to excite NADH in the cardiac tissue; a processor in communication with the light measuring instrument, the processor being programmed to; determine a base level of NADH fluorescence in the illuminated cardiac tissue; monitor a reduction in the NADH fluorescence in the illuminated cardiac tissue to between 60% and 80% of the base level and a steady state NADH fluorescence; and wherein, upon achieving the steady state NADH fluorescence for between 5 and 10 seconds, ablation of the illuminated cardiac tissue stops to limit an amount of ablation energy delivered to the cardiac tissue. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A system for monitoring tissue ablation comprising:
-
an elongated body; an ablation system associated with a distal tip of the elongated body for delivering ablation energy to cardiac tissue of endocardium; a visualization system comprising a light source, a light measuring instrument, and one or more optical fibers in communication with the light source and the light measuring instrument and extending through the elongated body to the distal tip, wherein the one or more optical fibers are configured to pass light energy to the cardiac tissue to illuminate the cardiac tissue to excite NADH in the illuminated cardiac tissue; a processor in communication with the light measuring instrument, the processor being programmed to; determine a base level of NADH fluorescence in the illuminated cardiac tissue; monitor a reduction in the NADH fluorescence in the illuminated cardiac tissue to between 60% and 80% of the base level and a steady state NADH fluorescence; and wherein, upon achieving the steady state NADH fluorescence for between 5 and 10 seconds, ablation of the illuminated cardiac tissue is stopped to limit an amount of ablation energy delivered to the cardiac tissue. - View Dependent Claims (22, 23, 24, 25, 26, 27)
-
-
28. A system for monitoring-tissue ablation comprising:
-
an elongated body having a distal tip; an ablation system for delivering electroporation energy to cardiac tissue of endocardium; a visualization system comprising a light source, a light measuring instrument, and one or more optical fibers in communication with the light source and the light measuring instrument and extending through the elongated body to the distal tip, wherein the one or more optical fibers are configured to pass light energy to the cardiac tissue to illuminate the cardiac tissue to excite NADH in the illuminated cardiac tissue; a processor in communication with the light measuring instrument, the processor being programmed to; determine a base level of NADH fluorescence in the illuminated cardiac tissue; monitor a reduction in the NADH fluorescence in the illuminated cardiac tissue to between 60% and 80% of the base level and a steady state NADH fluorescence; and wherein, upon achieving the steady state NADH fluorescence for between 5-10 seconds, ablation of the illuminated cardiac tissue stops to limit an amount of ablation energy delivered to the cardiac tissue.
-
-
29. A method for treating atrial fibrillation of cardiac tissue of endocardium comprising:
-
applying ablation energy to a cardiac tissue using an ablation catheter to form a lesion in the tissue at a location determined to treat atrial fibrillation; illuminating the cardiac tissue to excite NADH in the cardiac tissue and determining a base level of NADH fluorescence in the illuminated cardiac tissue; monitoring a level of NADH fluorescence in the illuminated cardiac tissue during the application of ablation energy to the illuminated cardiac tissue; stopping ablation of the illuminated cardiac tissue when the NADH fluorescence in the illuminated cardiac tissue reaches a reduction from the base level between 60% and 80% and achieves a steady state NADH fluorescence for a period of time between 5-10 seconds to limit an amount of ablation energy delivered to the cardiac tissue. - View Dependent Claims (30)
-
-
31. A system for treating atrial fibrillation using tissue ablation comprising:
-
an elongated body; an ablation system associated with a distal tip of the elongated body for delivering ablation energy to cardiac tissue of endocardium to treat atrial fibrillation; a visualization system comprising a light source, a light measuring instrument, and one or more optical fibers in communication with the light source and the light measuring instrument and extending through the elongated body to the distal tip, wherein the one or more optical fibers are configured to pass light energy to the cardiac tissue to illuminate the cardiac tissue to excite NADH in the illuminated cardiac tissue and to relay light energy reflected from the cardiac tissue to the light measuring instrument; a processor in communication with the light measuring instrument, the processor being programmed to; determine a base level of NADH fluorescence in the illuminated cardiac tissue; monitor a level of NADH fluorescence in the illuminated cardiac tissue during the application of ablation energy to the illuminated cardiac tissue, wherein ablation of the illuminated cardiac tissue is stopped when the NADH fluorescence in the illuminated cardiac tissue reaches a reduction from the base level between 60% and 80% and achieves a steady state NADH fluorescence for a period of time between 5-10 seconds to limit an amount of ablation energy delivered to the cardiac tissue. - View Dependent Claims (32)
-
-
33. A system for treating atrial fibrillation using tissue ablation comprising:
-
an elongated body having a distal tip; an ablation system for delivering electroporation energy to cardiac tissue of endocardium to treat atrial fibrillation; a visualization system comprising a light source, a light measuring instrument, and one or more optical fibers in communication with the light source and the light measuring instrument and extending through the elongated body to the distal tip, wherein the one or more optical fibers are configured to pass light energy to the cardiac tissue to illuminate the cardiac tissue to excite NADH in the illuminated cardiac tissue and to relay light energy reflected from the cardiac tissue to the light measuring instrument; a processor in communication with the light measuring instrument, the processor being programmed to; determine a base level of NADH fluorescence in the illuminated cardiac tissue; monitor a level of NADH fluorescence in the illuminated cardiac tissue during the application of ablation energy to the illuminated cardiac tissue, wherein ablation of the illuminated cardiac tissue is stopped when the NADH fluorescence in the illuminated cardiac tissue reaches a reduction from the base level between 60% and 80% and achieves a steady state NADH fluorescence for a period of time between 5-10 seconds to limit an amount of ablation energy delivered to the cardiac tissue. - View Dependent Claims (34)
-
Specification