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US 8,265,724 B2Granted
Cancellation of light shunting
AssigneeNellcor Puritan Bennett LLC
InventorEthan Petersen
Life of this patent
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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.
Claims14
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 a 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 while the sensor is placed on the false tissue;
- and
- storing the second signal value in the memory.
4 more elements
A method for operating a system for non-invasively determining physiological parameters, the method comprising:
- using a sensor to take measurements of tissue of interest;
- providing the measurements to a controller in a monitor;
- retrieving from a 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, wherein the attenuation coefficient of everything other than the tissue of interest relates at least in part to light shunting through the sensor;
- 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.
3 more elements
Dependencies are inferred from the claim text.