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Underfill management system for a biosensor

  • US 10,175,194 B2
  • Filed: 11/19/2015
  • Issued: 01/08/2019
  • Est. Priority Date: 06/07/2010
  • Status: Active Grant
First Claim
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1. A biosensor system for determining an analyte concentration in a sample, the biosensor system comprising:

  • a test sensor having a sample interface and a reservoir, the sample interface being in electrical communication with the reservoir, the reservoir including a counter electrode and a working electrode, the sample interface having conductors connected to the counter electrode and the working electrode;

    a portable measurement device having a processor, a sensor interface, and a storage medium, the sensor interface being in electrical or optical communication with the sample interface of the test sensor, the processor being connected to the sensor interface and in electrical communication with the storage medium, the storage medium storing at least one reference correlation pre-determined with a reference instrument, the processor being programmed to;

    apply a potential across the working electrode and the counter electrode,based on the applied potential, determine an initial fill state of the test sensor to be an initial underfill state in which an insufficient volume of sample is present in the reservoir,signal for adding sample in the reservoir until the test sensor has a sufficient volume of sample, the sufficient volume of sample changing the initial underfill state of the test sensor to a subsequent substantially full-fill state,apply an analytic test excitation signal to the sufficient volume of sample,generate at least one analytic output signal value responsive to the concentration of the analyte in the sufficient volume of sample and the analytic test excitation signal,compensate for underfill error in the at least one analytic output signal value in response to the initial underfill state and the subsequent substantially full-fill state of the test sensor, wherein the compensating for the underfill error includes;

    adjust the reference correlation with a compensation system, the compensation system including at least one index function previously determined from an error parameter, the compensation system applying one or more compensation equations in response to the initial underfill state and the subsequent substantially full-fill state of the test sensor, anddetermine an analyte concentration in the sample from the at least one analytic output signal value and the adjusting of the reference correlation; and

    a display communicatively coupled to the processor for displaying an error signal when there is an insufficient volume of sample, the display further displaying a numerical reading indicative of the analyte concentration in the sample.

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