Physiological parameter confidence measure
First Claim
1. A method of determining a measure of confidence in a physiological parameter, the physiological parameter determined by transmitting multiple wavelengths of optical radiation into a tissue site and detecting the optical radiation after tissue attenuation, the method comprising:
- deriving physiological data responsive to the intensity of three or more wavelengths of optical radiation transmitted into a tissue site and detected after tissue attenuation;
estimating a physiological parameter based upon the physiological data;
providing a plurality of data sets, each of the data sets based on related predetermined physiological data at the three or more wavelengths;
selecting at least one data set from the plurality of data sets based on the estimated physiological parameter; and
determining a measure of confidence in the estimated physiological parameter based upon the selected at least one data set and the derived physiological data.
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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.
1147 Citations
15 Claims
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1. A method of determining a measure of confidence in a physiological parameter, the physiological parameter determined by transmitting multiple wavelengths of optical radiation into a tissue site and detecting the optical radiation after tissue attenuation, the method comprising:
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deriving physiological data responsive to the intensity of three or more wavelengths of optical radiation transmitted into a tissue site and detected after tissue attenuation; estimating a physiological parameter based upon the physiological data; providing a plurality of data sets, each of the data sets based on related predetermined physiological data at the three or more wavelengths; selecting at least one data set from the plurality of data sets based on the estimated physiological parameter; and determining a measure of confidence in the estimated physiological parameter based upon the selected at least one data set and the derived physiological data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A confidence measurement system comprising:
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a sensor configured to provide data responsive to the intensity of three or more wavelengths of optical radiation transmitted into a tissue site and detected after tissue attenuation; a preprocessor configured to receive data from the sensor and determine a plurality of physiological data therefrom; a parameter estimator configured to receive the plurality of physiological data and output an estimate of a physiological parameter; a data element configured to store a plurality of data sets corresponding to known values of the physiological parameter and based on related predetermined physiological data at the three or more wavelengths; and a confidence measurer adapted to compare the plurality of physiological data with the plurality of data sets so as to select at least one data set based on at least the physiological parameter estimate and calculate a measure of confidence in the physiological parameter estimate based on the selected at least one data set and the plurality of physiological data. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification