USE OF MULTIPLE DATA POINTS AND FILTERING IN AN ANALYTE SENSOR
First Claim
1. A method of calibrating a biosensor that measures an analyte, comprising:
- obtaining a blood analyte concentration;
obtaining a plurality of biosensor output signal values;
applying a median filter to said plurality of biosensor output signal values to obtain a median sensor output value;
comparing said blood analyte concentration with said median sensor output value to obtain a sensor sensitivity value; and
utilizing said sensor sensitivity value to calibrate the signal output of said biosensor.
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Accused Products
Abstract
Embodiments of the present invention improve the accuracy of measurements and/or in vivo calibrations of a biosensor by (1) using more than one sensor signal value and/or more than one directly sampled and measured value, such as a capillary blood glucose value, and/or by (2) delaying the acquisition of a sensor output value that is compared with a directly sampled and measured value, such as a capillary blood glucose value, during a calibration. In an embodiment of the present invention, the median of a series of measured values, or a median or mean of the medians, may be utilized to provide more consistent and accurate measurement data and/or to compensate for error or artifact.
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Citations
32 Claims
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1. A method of calibrating a biosensor that measures an analyte, comprising:
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obtaining a blood analyte concentration;
obtaining a plurality of biosensor output signal values;
applying a median filter to said plurality of biosensor output signal values to obtain a median sensor output value;
comparing said blood analyte concentration with said median sensor output value to obtain a sensor sensitivity value; and
utilizing said sensor sensitivity value to calibrate the signal output of said biosensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A system for calibrating a biosensor that measures an analyte, comprising:
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an on-skin sensor control unit; and
a biosensor coupled to said on-skin sensor control unit, wherein said on-skin sensor control unit comprises programming instructions configured to receive a blood analyte concentration;
to receive a plurality of biosensor output signal values;
to apply a median filter to said plurality of biosensor output signal values to obtain a median sensor output value;
to compare said blood analyte concentration with said median sensor output value to obtain a sensor sensitivity value; and
to utilize said sensor sensitivity value to calibrate the signal output of said biosensor. - View Dependent Claims (19, 20)
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21. A method of sensing analyte using a biosensor, comprising:
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obtaining a plurality of raw biosensor output signal values;
applying a median filter to said plurality of raw biosensor output signal values to obtain a refined median sensor output value; and
displaying said refined median sensor output value on an electronic monitoring unit coupled to the biosensor. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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30. A system for sensing analyte using a biosensor, comprising:
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an on-skin sensor control unit; and
a biosensor coupled to said on-skin sensor control unit, wherein said on-skin sensor control unit comprises programming instructions configured to receive a plurality of raw biosensor output signal values;
to apply a median filter to said plurality of raw biosensor output signal values to obtain a refined median sensor output value; and
to display said refined median sensor output value on an electronic monitoring unit coupled to the biosensor. - View Dependent Claims (31, 32)
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Specification