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System and method for dynamically calibrating and measuring analyte concentration in diabetes management monitors

  • US 10,379,125 B2
  • Filed: 07/31/2014
  • Issued: 08/13/2019
  • Est. Priority Date: 12/27/2013
  • Status: Active Grant
First Claim
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1. An optical analyte sensor for determining a concentration of glucose, comprising:

  • a glucose permeable hydrogel matrix comprising a glucose binding protein (GBP) that adopts a first conformation in the presence of glucose, and a second conformation in the absence of glucose, the conformational change resulting in a different fluorescence emission intensity, the matrix adapted to receive a sample containing glucose at an unknown concentration;

    wherein the GBP within the glucose permeable hydrogel matrix is adapted to fluoresce at an intensity invariant to the glucose concentration within the matrix at an isosbestic frequency when subjected to an excitation source, and to fluoresce at an intensity that varies according to glucose concentration at a second frequency when subjected to an excitation source;

    a reference filter optically coupled to the matrix that passes a reference fluorescence emission from the matrix at a reference frequency, the reference frequency being an isosbestic frequency relative to the glucose binding protein, wherein the reference filter is a bandpass filter having an optimal bandpass range around the isosbestic frequency, a signal filter optically coupled to the matrix that passes a signal fluorescence emission from the matrix at a signal frequency, the signal frequency being an intensity variant frequency relative to the glucose binding protein, wherein the signal filter is a bandpass filter having a bandpass range selected to optimize detected power;

    a photodetector to detect an intensity of the reference fluorescence emission and an intensity of the signal fluorescence emission; and

    a processor adapted to compare the fluorescence intensity of the reference fluorescence emission and the signal fluorescence emission, and to determine a glucose concentration based on the relative intensities.

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