Cancellation of light shunting
First Claim
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1. A monitor, comprising:
- a memory device comprising one or more tangible, non-transitory, machine readable media collectively storing one or more sets of instructions; and
a processing device configured to execute the one or more sets of instructions to;
retrieve a first value representative of a total amount of light emitted by an emitter disposed on a sensor communicatively coupled to the monitor when the sensor is disposed on a tissue of interest;
receive a signal generated by a detector disposed on the sensor, wherein the signal is representative of a first amount of light detected by the detector;
retrieve a second value from the memory device or the sensor, wherein the second value is a first attenuation coefficient representative of a second amount of light shunting through the sensor;
determine a third value based at least in part on the first value, the second value, and the first amount of light, wherein the third value is a second attenuation coefficient representative of the tissue of interest; and
determine a physiological parameter based at least in part on the third value.
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Abstract
There is provided a system and method for canceling shunted light. The method includes transmitting electromagnetic radiation at tissue of interest and generating a signal representative of detected electromagnetic radiation. A portion of the generated signal representing shunted light is canceled from the generated signal and the remaining portion of the generated signal is used to compute physiological parameters.
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Citations
20 Claims
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1. A monitor, comprising:
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a memory device comprising one or more tangible, non-transitory, machine readable media collectively storing one or more sets of instructions; and a processing device configured to execute the one or more sets of instructions to; retrieve a first value representative of a total amount of light emitted by an emitter disposed on a sensor communicatively coupled to the monitor when the sensor is disposed on a tissue of interest; receive a signal generated by a detector disposed on the sensor, wherein the signal is representative of a first amount of light detected by the detector; retrieve a second value from the memory device or the sensor, wherein the second value is a first attenuation coefficient representative of a second amount of light shunting through the sensor; determine a third value based at least in part on the first value, the second value, and the first amount of light, wherein the third value is a second attenuation coefficient representative of the tissue of interest; and determine a physiological parameter based at least in part on the third value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system, comprising:
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a sensor configured to be disposed on a tissue of interest, the sensor comprising; an emitter configured to emit electromagnetic radiation to the tissue of interest; a detector configured to detect the electromagnetic radiation and generate a signal representative of a first amount of electromagnetic radiation detected by the detector; and a monitor communicatively coupled to the sensor, the monitor comprising; a first memory device comprising one or more tangible, non-transitory, machine readable media collectively storing one or more sets of instructions; and a processing device configured to execute the one or more sets of instructions to; receive the signal generated by the detector representative of the first amount of electromagnetic radiation detected by the detector; retrieve a first value representative of a total amount of electromagnetic radiation emitted by the emitter; retrieve a second value representative of a first attenuation coefficient, wherein the first attenuation coefficient is representative of attenuation excluding the tissue of interest, and wherein the first attenuation coefficient relates at least in part to a second amount of electromagnetic radiation shunting through the sensor; determine a third value based at least in part on the first value, the second value, and the first amount of electromagnetic radiation, wherein the third value is a second attenuation coefficient representative of the tissue of interest; and determine a physiological parameter based at least in part on the third value. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method, comprising:
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retrieving a first value from a memory device associated with a monitor or a sensor communicatively coupled to the monitor, wherein the first value is representative of a total amount of light emitted by an emitter when the sensor is applied to a tissue of interest associated with the sensor; receiving a signal generated by a detector associated with the sensor, wherein the signal is representative of a first amount of light detected by the detector; retrieving a second value from the memory device, wherein the second value is a first attenuation coefficient representative of background attenuation other than by the tissue of interest, and wherein the first attenuation coefficient relates at least in part to a second amount of light shunting through the sensor; determining a third value based in part on the first value and second value by canceling the second amount of light shunting through the sensor from the first amount of light detected by the detector, wherein the third value is a second attenuation coefficient representative of the tissue of interest; and determining a physiological parameter based at least in part on the third value.
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Specification