System and method for visualizing tissue during ablation procedures
First Claim
1. A method of treating atrial fibrillation, comprising:
- delivering a distal portion of an ablation catheter to a position adjacent an ostium of a pulmonary vein;
irradiating a partial ring of tissue along the ostium via an illumination source slidably disposed within a lumen of the ablation catheter;
comparing a first amount of light reflected by the partial ring of tissue at a first, predetermined wavelength to a second amount of light reflected by the partial ring of tissue at a second, predetermined wavelength;
classifying the partial ring of tissue as a lesion or as de novo tissue if the first amount of light is less than or greater than the second amount of light, respectively; and
ablating the partial ring of tissue if classified as de novo tissue.
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Accused Products
Abstract
Systems for visualizing cardiac tissue during an ablation procedure are provided. In general, the systems include an imaging module configured to measure absorbance data at first and second wavelengths wherein the ratio of these absorbance values identifies the nature of the tissue (e.g., lesion, de novo tissue, etc.). The imaging module can also include a video system having at least two chips with corresponding bandpass filters centered at the first and second target wavelengths. The system can also include a processor and/or video monitor for combining the images produced by the various chips, determining treated and non-treated tissue based on the ratio of absorbance values at the target wavelengths, and displaying images of the treatment area. Methods of visualizing cardiac treatment areas during ablation procedures are also provided herein.
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Citations
13 Claims
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1. A method of treating atrial fibrillation, comprising:
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delivering a distal portion of an ablation catheter to a position adjacent an ostium of a pulmonary vein; irradiating a partial ring of tissue along the ostium via an illumination source slidably disposed within a lumen of the ablation catheter; comparing a first amount of light reflected by the partial ring of tissue at a first, predetermined wavelength to a second amount of light reflected by the partial ring of tissue at a second, predetermined wavelength; classifying the partial ring of tissue as a lesion or as de novo tissue if the first amount of light is less than or greater than the second amount of light, respectively; and ablating the partial ring of tissue if classified as de novo tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification