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:
- advancing the sensor intravascularly to position the sensor along a volume of tissue;
controlling the optical sensor to emit light comprising at least four spaced-apart light wavelengths;
detecting light scattered by the volume of tissue, wherein detecting light comprises measuring an optical sensor output signal corresponding to an intensity of the scattered light; and
computing a measure of tissue oxygenation in response to the detected light.
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Accused Products
Abstract
A medical device for monitoring a patient condition includes a sensor capable of being advanced transvascularly to be positioned along a volume of tissue, the sensor including a first combination of a light source and a light detector to emit light into a volume of tissue and to detect light scattered by the volume of tissue and to generate 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 and compute a measure of tissue oxygenation using the light detector output signal.
102 Citations
29 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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advancing the sensor intravascularly to position the sensor along a volume of tissue; controlling the optical sensor to emit light comprising at least four spaced-apart light wavelengths; detecting light scattered by the volume of tissue, wherein detecting light comprises measuring an optical sensor output signal corresponding to an intensity of the scattered light; and computing a measure of tissue oxygenation in response to the detected light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A medical device system, comprising:
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a sensor capable of being advanced transvascularly to be positioned along a volume of tissue, the sensor comprising a first combination of a light source and a light detector to emit light into a volume of tissue, to detect light scattered by the volume of tissue, and to 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 and compute a measure of tissue oxygenation in response to the light detector output signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. 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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advancing the sensor intravascularly to position the sensor along a volume of tissue; controlling the optical sensor to emit light comprising at least four spaced-apart light wavelengths; detecting light scattered by the volume of tissue, wherein detecting light comprises measuring an optical sensor output signal corresponding to an intensity of the scattered light; and computing a measure of tissue oxygenation in response to the detected light.
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Specification