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Biosensing meter with fail/safe procedures to prevent erroneous indications

  • US 5,352,351 A
  • Filed: 06/08/1993
  • Issued: 10/04/1994
  • Est. Priority Date: 06/08/1993
  • Status: Expired due to Term
First Claim
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1. A biosensing meter for receiving a sample strip that includes electrically isolated excitation and sense electrodes and a sample well bridging thereacross, with an analyte reactant resident therein, said biosensing meter comprising:

  • excitation supply means for applying an excitation potential to said excitation electrode;

    sense amplifier means connected to said sense electrode for producing an output signal when a volume of a biological fluid is placed in said sample well and creates a current path between said excitation and sense electrode;

    processor means coupled to said sense amplifier means for first, testing if said output signal exceeds a first threshold value and second, testing if said output signal thereafter exceeds a second, larger threshold value, an output signal that exceeds said first threshold value recognized as an indication of said volume in said sample cell, an output signal that exceeds said second larger threshold recognized as an indication that said volume will enable a subsequent determination to be made for an analyte in said biological fluid, said processor means only enabling said subsequent determination after said second, larger threshold has been exceeded by said output signal.

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