Method for spectrophotometric blood oxygenation monitoring
First Claim
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1. A method for non-invasively determining an absolute non-pulsatile blood oxygen saturation level within a subject'"'"'s tissue, said method comprising the steps of:
- providing a sensor having at least one transducer in communication with a processor, the transducer having at least one light source, a first light detector spaced apart from the light source by a first distance, and a second light detector spaced apart from the light source by a second distance, wherein the first distance is less than the second distance;
transmitting light signals from the light source into the subject'"'"'s tissue, wherein the transmitted light signals include a plurality of wavelengths;
sensing the light signals using the first light detector and the second light detector, and communicating information representative of the sensed light signals to the processor;
determining an attenuation of the transmitted light signals for each of the plurality of wavelengths using the processor to process the information representative of the sensed light signals; and
determining the absolute non-pulsatile blood oxygen saturation level within the subject'"'"'s tissue using the processor, which determining includes determining a difference in attenuation between the plurality of wavelengths.
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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
12 Claims
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1. A method for non-invasively determining an absolute non-pulsatile blood oxygen saturation level within a subject'"'"'s tissue, said method comprising the steps of:
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providing a sensor having at least one transducer in communication with a processor, the transducer having at least one light source, a first light detector spaced apart from the light source by a first distance, and a second light detector spaced apart from the light source by a second distance, wherein the first distance is less than the second distance; transmitting light signals from the light source into the subject'"'"'s tissue, wherein the transmitted light signals include a plurality of wavelengths; sensing the light signals using the first light detector and the second light detector, and communicating information representative of the sensed light signals to the processor; determining an attenuation of the transmitted light signals for each of the plurality of wavelengths using the processor to process the information representative of the sensed light signals; and determining the absolute non-pulsatile blood oxygen saturation level within the subject'"'"'s tissue using the processor, which determining includes determining a difference in attenuation between the plurality of wavelengths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for non-invasively determining an absolute non-pulsatile blood oxygen saturation level within a subject'"'"'s tissue, comprising:
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a sensor having at least one transducer, the transducer having at least one light source, a first light detector spaced apart from the light source by a first distance, and a second light detector spaced apart from the light source by a second distance, wherein the first distance is less than the second distance, and a processor in communication with the transducer; wherein the transducer is operable to transmit light signals from the light source into the subject'"'"'s tissue, wherein the transmitted light signals include a plurality of wavelengths, and is operable to sense the light signals using the first light detector and the second light detector, and communicate information representative of the sensed light signals to the processor; wherein the processor is adapted to determine an attenuation of the transmitted light signals for each of the plurality of wavelengths using the information representative of the sensed light signals, and is adapted to determine the absolute non-pulsatile blood oxygen saturation level within the subject'"'"'s tissue, which saturation level determination includes determining a difference in attenuation between the plurality of wavelengths. - View Dependent Claims (10, 11, 12)
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Specification