TISSUE OXIMETRY APPARATUS AND METHOD
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Abstract
An apparatus and method for determining tissue oxygenation such as arterial and venous oxygenation and cerebral oxygenation. In one embodiment, the optical properties of tissue are determined using measured light attenuations at a set of wavelengths. By choosing distinct wavelengths and using light attenuation information, the influence of variables such as light scattering, absorption and other optical tissue properties can be minimized.
17 Citations
20 Claims
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1. (canceled)
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2. An apparatus for measuring oxygenation comprising:
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a sensor interface having a surface and including at least two emitters placed apart from each other on the surface, the emitters configured to emit light of at least two wavelengths into tissue proximate the surface, and including at least two detectors including a first detector and a second detector, wherein the first detector is configured to generate a first output signal corresponding to detected light of the at least two wavelengths passing through the tissue along a first plurality of paths and wherein the second detector is configured to generate a second output signal corresponding to detected light of the at least two wavelengths passing through the tissue along a second plurality of paths, wherein at least one path is configured to provide a depth of penetration of a light path that travels in a selected region of the tissue; a storage device within the sensor interface for retaining information identifying the emitters and detectors configuration; and a processor configured to determine oxygenation corresponding to the selected region of the tissue, the oxygenation determined based on the first output signal, the second output signal, and the retained information. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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9. An apparatus for measuring oxygenation comprising:
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a sensor interface having a surface and including at least two emitters placed apart from each other on the surface, the emitters configured to emit light of at least two wavelengths into tissue proximate the surface, and including at least two detectors including a first detector and a second detector, wherein the first detector is configured to generate a first output signal corresponding to detected light of the at least two wavelengths passing through the tissue along a first plurality of light paths and wherein the second detector is configured to generate a second output signal corresponding to detected light of the at least two wavelengths passing through the tissue along a second plurality of light paths, wherein at least one light path is configured to provide a depth of penetration of a light path that travels in a selected region of the tissue; and a processor coupled to the sensor interface and configured to determine oxygenation corresponding to the selected region of the tissue, the oxygenation determined based on the first output signal, the second output signal, and a model-based calculation, the model-based calculation corresponding to decreased attenuation of light due to scattering as a function of wavelength. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of determining tissue oxygenation comprising:
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positioning a plurality of emitters and a plurality of detectors on a surface of a sensor interface, the plurality of emitters configured to emit light having a plurality of wavelengths into tissue proximate the surface and each of the plurality of detectors configured to provide an output signal corresponding to light detected by the detector, wherein at least one detector is configured to provide an output signal corresponding to a light path through a selected region of the tissue, the selected region corresponding to a depth of penetration and the depth of penetration corresponding to a distance between an emitter and the detector; and configuring a processor to calculate oxygenation corresponding to the selected region of the tissue, the oxygenation determined based on the output signals and a model-based. calculation, the model-based calculation corresponding to decreased attenuation of light due to scattering as a function of wavelength. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification