Real time self-adjusting calibration algorithm
First Claim
1. A method of calibrating sensor data collected from a sensor, wherein a calibration formula based on past calibrations is used to interpret the sensor data, the method comprising the steps of:
- obtaining a calibration reference value for the sensor;
calculating a current calibration factor based on the calibration reference value and a current sensor data point;
identifying either a possible error or change in sensitivity in the sensor from the current calibration factor; and
confirming a sensor failure or recognizing a change in sensor sensitivity.
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Accused Products
Abstract
A method of calibrating glucose monitor data includes collecting the glucose monitor data over a period of time at predetermined intervals. It also includes obtaining at least two reference glucose values from a reference source that temporally correspond with the glucose monitor data obtained at the predetermined intervals. Also included is calculating the calibration characteristics using the reference glucose values and the corresponding glucose monitor data to regress the obtained glucose monitor data. And calibrating the obtained glucose monitor data using the calibration characteristics is included. In preferred embodiments, the reference source is a blood glucose meter, and the at least two reference glucose values are obtained from blood tests. In additional embodiments, the calculation of the calibration characteristics is obtained using linear regression and in particular embodiments, least squares linear regression. Alternatively, the calculation of the calibration characteristics is obtained using non-linear regression.
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Citations
39 Claims
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1. A method of calibrating sensor data collected from a sensor, wherein a calibration formula based on past calibrations is used to interpret the sensor data, the method comprising the steps of:
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obtaining a calibration reference value for the sensor;
calculating a current calibration factor based on the calibration reference value and a current sensor data point;
identifying either a possible error or change in sensitivity in the sensor from the current calibration factor; and
confirming a sensor failure or recognizing a change in sensor sensitivity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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14. An apparatus for calibrating sensor data collected from a sensor, wherein a calibration formula based on past calibrations is used to interpret the sensor data, the apparatus comprising:
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means for obtaining a calibration reference value for the sensor;
means for calculating a current calibration factor based on the calibration reference value and a current sensor data point;
means for identifying either a possible error or change in sensitivity in the sensor from the current calibration factor; and
means for confirming a sensor failure or recognizing a change in sensor sensitivity.
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27. An article of manufacture containing code for calibrating sensor data collected from a sensor, wherein a calibration formula based on past calibrations is used to interpret the sensor data, comprising a computer usable media including at least one embedded computer program that is capable of causing at least one computer to perform:
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obtaining a calibration reference value for the sensor;
calculating a current calibration factor based on the calibration reference value and a current sensor data point;
identifying either a possible error or change in sensitivity in the sensor from the current calibration factor; and
confirming a sensor failure or recognizing a change in sensor sensitivity.
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Specification