Physiological measurement system with automatic wavelength adjustment
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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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.
1511 Citations
26 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of automatically adjusting a number of a plurality of wavelengths used in a physiological measurement system with an emitter assembly comprising a plurality of light emitting sources configured to emit optical radiation at a set of wavelengths, the method comprising:
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determining a signal quality of the optical radiation emitted by the plurality of light emitting sources by; for one or more of the plurality of light emitting sources in the emitter assembly of the physiological measurement system; providing a first test current, which is less than an operational current, to the light emitting source configured to emit optical radiation at a particular wavelength of the set of wavelengths; measuring a first sensor signal output by the physiological measurement system upon detection of the optical radiation caused by the providing of the first test current after attenuation by body tissue; using the first measured sensor signal output to extrapolate a level of an expected sensor signal output in response to the operational current provided to the light emitting source; and determining whether the extrapolated level of the expected sensor signal output falls within an acceptable range of signal level to support a determination of one or more physiological measurements; and using fewer wavelengths than the set of wavelengths when the signal quality is insufficient to support the set of wavelengths. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification