发明名称 |
Biosensing meter with fail/safe procedures to prevent erroneous indications |
摘要 |
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.
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申请公布号 |
US5352351(A) |
申请公布日期 |
1994.10.04 |
申请号 |
US19930073180 |
申请日期 |
1993.06.08 |
申请人 |
BOEHRINGER MANNHEIM CORPORATION |
发明人 |
WHITE, BRADLEY E.;PARKS, ROBERT A.;RITCHIE, PAUL G.;SVETNIK, VLADIMIR |
分类号 |
G01N27/26;G01N27/327;G01N27/416;G01N33/487;(IPC1-7):G01N27/26 |
主分类号 |
G01N27/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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