SENSOR FAULT DETECTION USING ANALYTE SENSOR DATA PATTERN COMPARISON
First Claim
1. A computer-implemented method, comprising:
- storing a baseline data point in a memory wherein the baseline data point is representative of a first point on a glucose control grid;
storing an evaluation data point in the memory wherein the evaluation data point is representative of a second point on the glucose control grid;
computing a magnitude of a vector that would extend between the baseline data point and the evaluation data point if plotted on the glucose control grid;
defining a gradient function over an area of the glucose control grid and determining gradient contour lines around the baseline data point and the evaluation data point;
computing a component of the magnitude of the vector between the baseline data point and the evaluation data point that is parallel to a contour line of the defined gradient function;
comparing the component of the magnitude of the vector to a predefined threshold value; and
displaying, on a system display, an indication that a sensor fault has been detected if the component of the magnitude of the vector is greater than a first predefined threshold value.
1 Assignment
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Accused Products
Abstract
Analyte sensor faults are detected. Datasets of glucose values sensor electronics are coupled to a glucose sensor in fluid contact with interstitial fluid under a skin surface. Baseline median glucose value and glucose variability values are computed, based on the first dataset. A baseline data point is stored. Evaluation median glucose value and variability are computed, based on the second dataset of glucose values. An evaluation data point is stored. A magnitude of a vector that extends between the baseline data point and the evaluation data point is computed. A component of the magnitude of the vector that is parallel to a hypoglycemia risk contour line is computed and compared to a predefined threshold value. An indication that a sensor fault has been detected if the component is greater than a threshold is displayed.
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Citations
26 Claims
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1. A computer-implemented method, comprising:
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storing a baseline data point in a memory wherein the baseline data point is representative of a first point on a glucose control grid; storing an evaluation data point in the memory wherein the evaluation data point is representative of a second point on the glucose control grid; computing a magnitude of a vector that would extend between the baseline data point and the evaluation data point if plotted on the glucose control grid; defining a gradient function over an area of the glucose control grid and determining gradient contour lines around the baseline data point and the evaluation data point; computing a component of the magnitude of the vector between the baseline data point and the evaluation data point that is parallel to a contour line of the defined gradient function; comparing the component of the magnitude of the vector to a predefined threshold value; and displaying, on a system display, an indication that a sensor fault has been detected if the component of the magnitude of the vector is greater than a first predefined threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for determining analyte concentration in blood based on analyte concentration measured in interstitial fluid, the system comprising:
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a processor; and a memory coupled to the processor, the memory storing processor executable instructions to; store a baseline data point in the memory wherein the baseline data point is representative of a first point on an analyte control grid; store an evaluation data point in the memory wherein the evaluation data point is representative of a second point on the analyte control grid; compute a magnitude of a vector that would extend between the baseline data point and the evaluation data point if plotted on the analyte control grid; define a gradient function over an area of the analyte control grid and determine gradient contour lines around the baseline data point and the evaluation data point; compute a component of the magnitude of the vector between the baseline data point and the evaluation data point that is parallel to a contour line of the defined gradient function; compare the component of the magnitude of the vector to a predefined threshold value; and display, on a system display, an indication that a sensor fault has been detected if the component of the magnitude of the vector is greater than a first predefined threshold value. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A computer-implemented method, comprising:
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storing an evaluation data point representative of a first point on a glucose control grid; storing a baseline data point representative of a second point on the glucose control grid; computing a magnitude of a vector that extends between the baseline data point and the evaluation data point; defining a gradient function over an area of the glucose control grid including determining at least one gradient contour line around the baseline data point and the evaluation data point; computing a component of the magnitude of the vector between the baseline data point and the evaluation data point that is parallel to a contour line of the defined gradient function; comparing the component of the magnitude of the vector to a predefined threshold value; and displaying, on a system display, an indication that an early signal attenuation (ESA) fault has been detected if the component of the magnitude of the vector is greater than a first predefined threshold value. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification