ABSOLUTE CALIBRATED TISSUE OXYGEN SATURATION AND TOTAL HEMOGLOBIN VOLUME FRACTION
First Claim
1. A method for monitoring a patient condition in a medical device having an optical sensor, the method comprising:
- controlling the optical sensor to emit light comprising at least four spaced-apart light wavelengths;
detecting light scattered by a volume of tissue wherein detecting light comprises measuring an optical sensor output signal corresponding to an intensity of the scattered light;
computing a measure of tissue oxygenation from the detected light; and
detecting tissue hypoxia in response to the computed measure of tissue oxygenation.
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Accused Products
Abstract
A medical device for monitoring a patient condition includes a first combination of a light source and a light detector to emit light into a volume of tissue, detect light scattered by the volume of tissue, and provide a first output signal corresponding to an intensity of the detected light. A control module is coupled to the light source to control the light source to emit light at least four spaced-apart light wavelengths, and a monitoring module is coupled to the light detector to receive the output signal, compute a measure of tissue oxygenation in response to the light detector output signal, and detect tissue hypoxia using the measure of tissue oxygenation.
78 Citations
21 Claims
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1. A method for monitoring a patient condition in a medical device having an optical sensor, the method comprising:
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controlling the optical sensor to emit light comprising at least four spaced-apart light wavelengths; detecting light scattered by a volume of tissue wherein detecting light comprises measuring an optical sensor output signal corresponding to an intensity of the scattered light; computing a measure of tissue oxygenation from the detected light; and detecting tissue hypoxia in response to the computed measure of tissue oxygenation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A medical device system, comprising:
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a first combination of a light source and a light detector to emit light into a volume of tissue, detect light scattered by the volume of tissue, and generate a first output signal corresponding to an intensity of the detected light; a control module coupled to the light source to control the light source to emit light comprising at least four spaced-apart light wavelengths; and a monitoring module coupled to the light detector to receive the output signal, compute a measure of tissue oxygenation in response to the light detector output signal, and detect tissue hypoxia using the measure of tissue oxygenation. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A computer readable medium having computer executable instructions for performing a method for monitoring a patient condition in a medical device having an optical sensor, the method comprising:
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controlling an optical sensor to emit light comprising at least four spaced-apart light wavelengths; detecting light scattered by a volume of tissue wherein detecting light comprises measuring an optical sensor output signal corresponding to an intensity of the scattered light; computing a measure of tissue oxygenation from the detected light; and detecting tissue hypoxia in response to the computed measure of tissue oxygenation.
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Specification