Spectral sensing of ablation
First Claim
1. A method for tissue assessment, comprising:
- ablating the tissue at a site within a body of a living subject using an invasive probe applied to the site;
at a first stage in the ablation of the tissue, making first measurements of scattered light intensities from the site at a first wavelength, a second wavelength, and a third wavelength;
at a second stage in the ablation of the tissue, subsequent to the first stage, making second measurements of the scattered light intensities from the site at the first wavelength, the second wavelength, and the third wavelength;
computing a first ratio between the first measurement and the second measurement at the first wavelength, computing a second ratio between the first measurement and the second measurement at the second wavelength, and computing a third ratio between the first measurement and the second measurement at the third wavelength;
dividing a product of the second and third ratios by the first ratio to determine an overall ratio value;
estimating a size of a lesion based on the overall ratio value; and
controlling the ablation of the tissue based on the estimated size of the lesion.
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Abstract
A method for tissue assessment includes ablating tissue at a site within a body of a living subject using an invasive probe applied to the site. At a first stage in ablation of the tissue, first measurements are made of scattered light intensities from the site at a plurality of different wavelengths. At a second stage in the ablation of the tissue, subsequent to the first stage, second measurements are made of the scattered light intensities from the site at the plurality of different wavelengths. Progress of the ablation is assessed by computing different, respective measures of change in the scattered light intensities at the different wavelengths occurring between the first and second measurements, and comparing the respective measures.
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Citations
17 Claims
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1. A method for tissue assessment, comprising:
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ablating the tissue at a site within a body of a living subject using an invasive probe applied to the site; at a first stage in the ablation of the tissue, making first measurements of scattered light intensities from the site at a first wavelength, a second wavelength, and a third wavelength; at a second stage in the ablation of the tissue, subsequent to the first stage, making second measurements of the scattered light intensities from the site at the first wavelength, the second wavelength, and the third wavelength; computing a first ratio between the first measurement and the second measurement at the first wavelength, computing a second ratio between the first measurement and the second measurement at the second wavelength, and computing a third ratio between the first measurement and the second measurement at the third wavelength; dividing a product of the second and third ratios by the first ratio to determine an overall ratio value; estimating a size of a lesion based on the overall ratio value; and controlling the ablation of the tissue based on the estimated size of the lesion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A medical apparatus, comprising:
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an invasive probe having a distal end, the invasive probe including a cap having an optical port disposed at the distal end, and an optical fiber extending through the probe and terminating at the optical port, the invasive probe being configured to ablate a tissue at a site within a body of a living subject; a radiation source connected to the optical fiber; a detector connected to the optical fiber; and a processor connected to the radiation source and the detector, wherein the processor is configured to; receive a first intensity measurement and a second intensity measurement from the detector; compute a first ratio between the first intensity measurement and the second intensity measurement at a first wavelength, a second ratio between the first intensity measurement and the second intensity measurement at a second wavelength, and a third ratio between the first intensity measurement and the second intensity measurement at a third wavelength; divide a product of the second and third ratios by the first ratio to determine an overall ratio value; estimate a size of a lesion based on the overall ratio value; and control the ablation of the tissue based on the estimated size of the lesion. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification