PHYSIOLOGICAL MEASUREMENT SYSTEM WITH AUTOMATIC WAVELENGTH ADJUSTMENT
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Abstract
Disclosed herein is a physiological measurement system that can automatically adjust the number of wavelengths used based on the quality of a sensor signal that is reflective of an optical radiation detected at a sensor after tissue attenuation. The signal quality is examined to determine if it is sufficient to support the use of a full set of wavelengths. If it is determined to be insufficient to support the full set, a reduced number of wavelengths is used.
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Citations
48 Claims
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1-28. -28. (canceled)
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29. An optical non-invasive physiological parameter measurement system comprising:
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one or more light emitting sources configured to emit light at a plurality of wavelengths; a sensor configured to detect light emitted by the one or more light emitting sources after the emitted light is attenuated by body tissue, and to generate an output signal useable to measure at least one physiological parameter of the body tissue; and a processor configured to; cause the one or more light emitting sources to emit light at the plurality of wavelengths; determine a physiological parameter estimate from a first output signal received from the sensor based on detected light emitted at the plurality of wavelengths; determine a confidence measurement value based on the physiological parameter estimate and a physiological data reference; cause the one or more light emitting sources to emit light at less than the plurality of wavelengths by deactivating at least one of the plurality of wavelength emissions when the confidence measurement value is less than a threshold value; and determine a physiological parameter measurement based on a second output signal received from the sensor based on detected light emitted at less than all of the plurality of wavelengths. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A method for automatically adjusting a number of a plurality of wavelengths used in a physiological measurement system, the method comprising:
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emitting light at a plurality of wavelengths with one or more light emitting sources; detecting, with a sensor, light emitted by one or more light emitting sources after attenuation by body tissue, the sensor generating a first output signal; determining a physiological parameter estimate from the first output signal received from the sensor based on the detected light emitted at the plurality of wavelengths; determining a confidence measurement value based on the physiological parameter estimate and a physiological data reference; deactivating at least one of the plurality of wavelength emissions when the confidence measurement value is less than a threshold value to cause the plurality of light emitting sources to emit light at less than the plurality of wavelengths by; and determining a physiological parameter measurement based on a second output signal received from the sensor based on the detected light emitted at the less than all of the plurality of wavelengths. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48)
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Specification