Method for spectrophotometric blood oxygenation monitoring
First Claim
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1. A method for determining blood oxygenation within a subject'"'"'s tissue, said method comprising the steps:
- transmitting a light signal with a near infrared spectrophotometric light source at a plurality of wavelengths into the subject'"'"'s tissue;
receiving light energy with a first light signal detector and a second light signal detector, which light energy corresponds to the light signal after the light signal has passed through the subject'"'"'s tissue, and wherein the light source is spaced from the first light signal detector by a first distance, and the light source is spaced from the second light signal detector by a second distance wherein the second distance is greater than the first distance; and
processing the light energy received at the plurality of wavelengths, including using wavelength dependent sensor calibration constants representative of energy losses incurred by the light signal passing through the subject'"'"'s tissue, to determine the blood oxygenation within the subject'"'"'s tissue.
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Abstract
A method and apparatus for non-invasively determining the blood oxygenation within a subject'"'"'s tissue is provided that utilizes a near infrared spectrophotometric (NIRS) sensor capable of transmitting a light signal into the tissue of a subject and sensing the light signal once it has passed through the tissue via transmittance or reflectance.
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Citations
31 Claims
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1. A method for determining blood oxygenation within a subject'"'"'s tissue, said method comprising the steps:
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transmitting a light signal with a near infrared spectrophotometric light source at a plurality of wavelengths into the subject'"'"'s tissue; receiving light energy with a first light signal detector and a second light signal detector, which light energy corresponds to the light signal after the light signal has passed through the subject'"'"'s tissue, and wherein the light source is spaced from the first light signal detector by a first distance, and the light source is spaced from the second light signal detector by a second distance wherein the second distance is greater than the first distance; and processing the light energy received at the plurality of wavelengths, including using wavelength dependent sensor calibration constants representative of energy losses incurred by the light signal passing through the subject'"'"'s tissue, to determine the blood oxygenation within the subject'"'"'s tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining blood oxygenation within a subject'"'"'s tissue, said method comprising the steps:
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transmitting a light signal with a near infrared spectrophotometric light source, the light signal including at least a first wavelength, a second wavelength, and a third wavelength, into the subject'"'"'s tissue; receiving light energy with a first light signal detector and a second light signal detector, which light energy corresponds to the light signal after the light signal has passed through the subject'"'"'s tissue, and wherein the light source is spaced from the first light signal detector by a first distance, and the light source is spaced from the second light signal detector by a second distance wherein the second distance is greater than the first distance; and processing the light energy received at the first, second, and third wavelengths, including determining the difference in attenuation of the light signal between the first wavelength and second wavelength, and between the first wavelength and the third wavelength, and determining wavelength dependent sensor calibration constants to compensate for energy losses, to determine the blood oxygenation within the subject'"'"'s tissue. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A spectrophotometric examination device, comprising:
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a light signal transmitter operable to transmit at least one light signal at a plurality of discrete wavelengths; a first light signal detector operable to detect the light signal, and produce at least one detected signal corresponding to the light signal, which first light signal detector is located a first distance from the light signal transmitter; a second light signal detector operable to detect the light signal, and produce at least one detected signal corresponding to the light signal, which second light signal detector is located a second distance from the light signal transmitter, and the second distance is greater than the first distance; and a processor having an algorithm for determining the blood oxygenation in a subject'"'"'s tissue, the algorithm being operable to process detected signals at a plurality of discrete wavelengths, and the algorithm including a plurality of wavelength dependent calibration constants to compensate for energy losses incurred by the light signals passing through the subject'"'"'s tissue. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A spectrophotometric examination device, comprising:
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a light signal transmitter operable to transmit at least one light signal, the light signal including at least three discrete wavelengths; a first light signal detector operable to detect the light signal, and produce at least one detected signal corresponding to the light signal, which first light signal detector is located a first distance from the light signal transmitter; a second light signal detector operable to detect the light signal, and produce at least one detected signal corresponding to the light signal, which second light signal detector is located a second distance from the light signal transmitter, and the second distance is greater than the first distance; and a processor having an algorithm for determining the blood oxygenation in a subject'"'"'s tissue, the algorithm being operable to process the light energy received at a plurality of wavelengths, and compensate for energy losses attributable to absorption from biological compounds other than hemoglobin, to determine the blood oxygenation within the subject'"'"'s tissue. - View Dependent Claims (29, 30, 31)
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Specification