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AssigneeBoehringer Mannheim GmbH
InventorsBradley E. White, Robert A. Parks, Paul G. Ritchie, Vladimir Svetnik
Estimating the term…
A biosensing meter receives a sample strip that includes electrically isolated sense and excitation electrodes bridged by a reaction zone. When a drop of biological sample fluid is placed in the reaction zone, a plurality of fail/safe tests are performed. A drop size test is performed by a circuit that detects the size of the drop placed in the reaction zone. The circuit both detects that a drop has been placed in the reaction zone and further measures a test current level, after a delay, to determine that the drop size is sufficient to enable hydration of reactants in the reaction zone. Subsequently, during the reaction, a "delta" current change is measured at succeeding sample time. This test measures the difference between succeeding current samples during a measurement time. If each succeeding sample is not less than preceding sample by a delta value, a determination is made that the current is not monotonically decreasing and the test is aborted. At the termination of the measurement time, a current sum test is performed wherein a processor calculates a linear sum of all sample test currents and calculates a ratio between that sum and the last current sample. If that ratio matches a pre-calculated constant for the Cottrell relationship, then it is known that the measurement values exhibit the Cottrell relationship.
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:
A biosensing meter for receiving a sample strip that includes a pair of electrode means and an analyte reactant containing reaction zone bridging said pair of electrode means, said biosensing meter for determining whether a current through said reaction zone varies in accordance with a Cottrell relationship, said meter comprising:
A biosensing meter for receiving a sample strip that includes a pair of electrode means and analyte reactant containing reaction zone bridging said pair of electrode means, said biosensing meter for determining whether a current through said reaction zone varies in accordance with a Cottrell relationship, said meter comprising:
In a system for measuring a current i passing through a reaction zone of a test cell, which current, in dependence upon the concentration of an analyte in the reaction zone, changes to follow one of a family of curves whose shape is defined by the Cottrell equation, a method for determining that said current is changing in accordance with the Cottrell equation, said method comprising the steps of:
In a system for measuring a current i passing through a reaction zone of a test cell, which current, in dependence upon the concentration of an analyte in the reaction zone, changes to follow one of a family of curves whose shape is defined by the Cottrell equation, a method for determining that said current is changing in accordance with the Cottrell equation, said method comprising the steps of:
Dependencies are inferred from the claim text.