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Methods, systems, and devices for sensor fusion

  • US 10,349,872 B2
  • Filed: 12/28/2015
  • Issued: 07/16/2019
  • Est. Priority Date: 12/28/2015
  • Status: Active Grant
First Claim
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1. A method of calculating a single, fused sensor glucose value based on respective sensor glucose values of a plurality of redundant working electrodes of a glucose sensor, said glucose sensor including a microcontroller, the method comprising:

  • performing, by said microcontroller, respective electrochemical impedance spectroscopy (EIS) procedures for each of the plurality of redundant working electrodes to obtain values of membrane resistance (Rmem) for each said working electrode;

    calculating, by said microcontroller, a respective Rmem fusion weight for each said working electrode based on the respective Rmem value for each of the plurality of redundant working electrodes;

    obtaining, by said microcontroller, a noise value for each of the plurality of redundant working electrodes;

    calculating, by said microcontroller, a respective noise fusion weight for each said working electrode based on the respective noise value for each of the plurality of redundant working electrodes;

    obtaining, by said microcontroller, a calibration factor (CF) value for each of the plurality of redundant working electrodes;

    calculating, by said microcontroller, a respective CF fusion weight for each said working electrode based on the respective CF value for each of the plurality of redundant working electrodes;

    for each of the plurality of redundant working electrodes, combining, by said microcontroller, the respective noise fusion weight and CF fusion weight to calculate a combined noise and CF fusion weight, wherein said combined noise and CF fusion weight is calculated by weighting and averaging the respective noise fusion weight and CF fusion weight by a predefined parameter;

    for each of the plurality of redundant working electrodes, calculating, by said microcontroller, an overall fusion weight based on said electrode'"'"'s Rmem fusion weight and combined noise and CF fusion weight;

    calculating, by said microcontroller, said single, fused sensor glucose value based on the respective overall fusion weight and sensor glucose value of each of the plurality of redundant working electrodes;

    determining, by said microcontroller, whether said single, fused sensor glucose value falls within a calculated range; and

    generating a signal, by said microcontroller, to display said single, fused sensor glucose value to a user of said glucose sensor when said single, fused sensor glucose value falls within said range.

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