PHYSIOLOGICAL PARAMETER CONFIDENCE MEASURE
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Accused Products
Abstract
Confidence in a physiological parameter is measured from physiological data responsive to the intensity of multiple wavelengths of optical radiation after tissue attenuation. The physiological parameter is estimated based upon the physiological data. Reference data clusters are stored according to known values of the physiological parameter. At least one of the data clusters is selected according to the estimated physiological parameter. The confidence measure is determined from a comparison of the selected data clusters and the physiological data.
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Citations
21 Claims
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1. (canceled)
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2. A physiological parameter measurement method comprising:
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receiving light intensity values responsive to detection of light at the three or more wavelengths after transmission into a tissue site and attenuation by the tissue site; determining a physiological measurement including an indication of a relationship among the light intensity values at three or more wavelengths; selecting, based on the physiological measurement, at least one of a plurality of reference data sets, wherein the reference data sets are empirically determined and each include a respective indication of a relationship among empirically determined light intensity values for a respective measurement at the three or more wavelengths; comparing the physiological measurement to the selected at least one of the reference data sets at the three or more wavelengths; and determining, based on the comparison, a measure of confidence in the physiological measurement. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A measurement system comprising:
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a sensor configured to; measure light intensity values at three or more wavelengths after transmission into a tissue site and attenuation by the tissue site; and in response to measuring the light intensity values at the three or more wavelengths, generate a sensor signal indicative of the light intensity values; a data element configured to store a plurality of reference data sets empirically determined and each including respective indications of relationships among empirically determined light intensity values for respective measurements at the three or more wavelengths; and a processor configured with executable instructions in order to; receive the sensor signal from the sensor; determine, based on the light intensity values indicated by the sensor signal, a physiological measurement including an indication of a relationship among the light intensity values at the three or more wavelengths; select, based on the physiological measurement, at least one of a plurality of reference data sets; compare the physiological measurement to the selected at least one of the reference data sets at the three or more wavelengths; and determine, based on the comparison, a measure of confidence in the physiological measurement. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification