Biosensing meter which detects proper electrode engagement and d

Details Biosensing meter which detects proper electrode engagement and d Biosensing meter which detects proper electrode engagement and d

1994-11-22

1995-08-01

Wieder, Kenneth A.

Electricity: measuring and testing

Electrolyte properties

Using a conductivity determining device

324525, 324693, 204406, G01R 2702

Patent

active

054382718

ABSTRACT:
A biosensing meter receives a biomedical sample strip or a check strip, a sample strip including electrically isolated excitation and sense electrodes. The biosensing meter includes first and second contacts that are positioned to be electrically connected by a sense electrode when a sample strip is inserted into the biosensing meter. An operational amplifier circuit has one input connected to the first contact and a second input connected to a reference potential, the one input manifesting the reference potential as a result of a feedback within the operational amplifier. A processor is coupled to the second contact and determines the presence of the reference potential at the second contact when an inserted sense electrode connects the first and second contacts. The processor also distinguishes between a sample strip and a check strip and, when a sample strip is inserted, that the sample strip exhibits a proper impedance between its sense and excitation electrodes--to enable operation of the biosensing meter upon dosing of the sample strip.

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