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Physiological measurement system with automatic wavelength adjustment

  • US 9,839,381 B1
  • Filed: 11/18/2010
  • Issued: 12/12/2017
  • Est. Priority Date: 11/24/2009
  • Status: Active Grant
First Claim
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1. An optical non-invasive physiological measurement system that automatically adjusts a number of wavelengths used in a measurement of physiological parameters, the system comprising:

  • a plurality of light emitting sources, including at least three light emitting sources, configured to emit light at a plurality of wavelengths, including at least three different wavelengths;

    a sensor configured to detect the emitted light after attenuation by body tissue of a patient and output a signal that corresponds to at least one physiological parameter of the body tissue of the patient; and

    a processor configured to;

    cause a test current, which is less than an operational current, to be provided to one or more of the plurality of the light emitting sources;

    measure the quality of a signal output by the sensor in response to detecting the light emitted by the one or more of the plurality of the light emitting sources as a result of the test current;

    use the signal output to extrapolate a level of an expected signal output by the sensor when the operational current is supplied to the one or more light emitting sources;

    determine if the level of the expected signal output falls within an acceptable range to support the measurement of one or more physiological parameters of the body issue; and

    reduce the number of the plurality of light emitting sources that are used in operation to determine a physiological parameter of the body tissue based on the expected signal output, so that fewer light emitting sources are used to determine the physiological parameter when the expected signal output is determined to be insufficient to support the plurality of wavelengths, wherein the expected signal output is determined to be insufficient when a level of the expected signal output for the one or more of the plurality of light emitting sources configured to emit a particular wavelength of the plurality of wavelengths falls outside of the acceptable range.

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