Cancellation of light shunting
First Claim
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1. A method of manufacture for a non-invasive sensor comprising:
- communicatively coupling a sensor to a test device, wherein the sensor is configured to emit and detect electromagnetic radiation;
determining a first signal value for each wavelength of light emitted from an emitter of the sensor;
storing the first signal value in a memory;
placing the sensor on false tissue, the false tissue being opaque;
operating the sensor to determine a second signal value for each wavelength emitted from the emitter of the sensor; and
storing the second signal value in the memory.
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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
27 Claims
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1. A method of manufacture for a non-invasive sensor comprising:
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communicatively coupling a sensor to a test device, wherein the sensor is configured to emit and detect electromagnetic radiation; determining a first signal value for each wavelength of light emitted from an emitter of the sensor; storing the first signal value in a memory; placing the sensor on false tissue, the false tissue being opaque; operating the sensor to determine a second signal value for each wavelength emitted from the emitter of the sensor; and storing the second signal value in the memory. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for operating a system for non-invasively determining physiological parameters, the method comprising:
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using a sensor to take measurements of tissue of interest; providing the measurements to a controller in a monitor; retrieving from memory a first value and a second value, the first value representing an amount of light emitted from emitters in the sensor and the second value representing an attenuation coefficient of everything other than the tissue of interest; determining a third value using the measurements provided to the controller and the first and second values, the third value representing an attenuation coefficient for the tissue of interest; and using the third value to calculate physiological parameters. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A sensor comprising:
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an emitter configured to emit electromagnetic energy primarily through the tissue of interest; a detector configured to detect the electromagnetic energy emitted by the emitter; and a memory storing shunting information, the memory being configured to communicate the shunting information to a monitor configured to compute physiological parameters based on the detected electromagnetic energy. - View Dependent Claims (17, 18)
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19. A monitor for computing physiological parameters comprising:
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a processor configured to compute physiological parameters; a memory communicatively coupled with the processor, the memory storing shunting information about certain types of sensors or individual sensors, wherein monitor retrieves shunting information for a certain type of sensor or for an individual sensor when a certain type of sensor or individual sensor is coupled to the monitor. - View Dependent Claims (20)
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21. A system comprising:
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a sensor comprising; an emitter configured to emit electromagnetic radiation at tissue; a detector configured to generate a signal in response to detecting the electromagnetic radiation emitted from the emitter; and a monitor communicatively coupled with the sensor comprising; a controller configured to remove a shunting light value from the generated signal to produce an attenuation coefficient of the tissue and use the attenuation coefficient in calculating physiological parameters. - View Dependent Claims (22, 23, 24)
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25. A method for operation of a monitor comprising:
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receiving a signal generated by a detector representative of an amount of light detected by the detector; canceling a portion of the generated signal to obtain a signal representative of the attenuation coefficient of tissue; and computing physiological parameters using the attenuation coefficient of tissue. - View Dependent Claims (26, 27)
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Specification