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Underfill detection system for a biosensor

  • US 9,939,406 B2
  • Filed: 02/02/2015
  • Issued: 04/10/2018
  • Est. Priority Date: 05/03/2006
  • Status: Active Grant
First Claim
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1. A biosensor for determining an analyte concentration in a biological fluid, comprising:

  • a sensor strip having a sample interface on a base, the base forming a reservoir and a channel with an opening, the base further having a surface on which at least one working electrode and at least one counter electrode are disposed, the sample interface having conductors connected to the working electrode and the counter electrode, a biological fluid sample received in the opening flowing through the channel to fill at least in part the reservoir;

    a measuring device in electrical or optical communication with the reservoir, the measurement device having electrical circuitry including a processor and a storage medium, the electrical circuitry being communicatively coupled to a signal generator and a sensor interface, the processor having instructions and data stored in the storage medium and being configured to;

    in response to receiving the biological fluid sample in the reservoir, instruct the signal generator to apply a test excitation electrical signal to the sensor interface, the test excitation electrical signal being transmitted by the sensor interface to the sample interface for applying the test excitation electrical signal to the biological fluid sample,switch the test excitation electrical signal to at least one different amplitude during at least one of a start of the test excitation electrical signal, a test pulse, or a transition from one test pulse to another test pulse,in response to the test excitation electrical signal, generate from the biological fluid sample a first test output electrical signal during a first time interval and a second test output electrical signal during a second time interval, the first time interval being different than the second time interval,subtract a value of the first test output electrical signal from a value of the second test output electrical signal to determine a value change between the first test output electrical signal and the second test output electrical signal,compare the value change to a value of at least one underfill threshold, anddetermine if the sensor strip is underfilled based on the comparison between the value change and the at least one underfill threshold.

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