Blood sugar analyzer having fixed enzyme membrane sensor
First Claim
1. A blood sugar analyzing apparatus having a reaction cell which houses a fixed enzyme membrane sensor and a measuring electrode and which receives a blood specimen, said fixed enzyme membrane sensor measuring the blood sugar concentration in the blood specimen as a function of a reaction current signal generated in the sensor by the chemical reaction, and means for calculating a reaction current offset for adjusting the measured reaction current value to more accurately detect the actual blood sugar concentration by subtracting said offset from said measured reaction current value;
- and said apparatus having monitoring means for sensing a plurality of operational values including reaction cell current, reaction cell temperature and reaction current offset, to compare said sensed values with predetermined corresponding ranges, and to display an error signal when at least one of said values exceeds it corresponding range, to thereby provide information concerning operation conditions and maintenance needs to an operator.
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Accused Products
Abstract
A blood sugar analyzing apparatus has a reaction cell which houses a fixed enzyme membrane sensor and a measuring electrode which receives a blood specimen which causes a chemical reaction between the blood specimen and said fixed enzyme membrane for measuring the blood sugar concentration in the specimen on the basis of a reaction current signal generated in the sensor by the chemical reaction. The analyzing apparatus has a microcomputer for calculating a conversion coefficient used for converting the reaction current into a blood sugar concentration value by introducing a standard solution having a known blood sugar concentration, for storing data representing the value of said conversion coefficient, for calculating a blood sugar concentration value of a test specimen based upon the stored conversion coefficient value and reaction current from the test specimen. A display and printer provide a read-out of the blood sugar concentration value obtained. The microcomputer controls temperature and timing of the measurement process, as well as other control functions.
489 Citations
15 Claims
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1. A blood sugar analyzing apparatus having a reaction cell which houses a fixed enzyme membrane sensor and a measuring electrode and which receives a blood specimen, said fixed enzyme membrane sensor measuring the blood sugar concentration in the blood specimen as a function of a reaction current signal generated in the sensor by the chemical reaction, and means for calculating a reaction current offset for adjusting the measured reaction current value to more accurately detect the actual blood sugar concentration by subtracting said offset from said measured reaction current value;
- and said apparatus having monitoring means for sensing a plurality of operational values including reaction cell current, reaction cell temperature and reaction current offset, to compare said sensed values with predetermined corresponding ranges, and to display an error signal when at least one of said values exceeds it corresponding range, to thereby provide information concerning operation conditions and maintenance needs to an operator.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 15)
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10. A blood sugar analyzing apparatus having a reaction cell which houses a fixed enzyme membrane sensor and a measuring electrode and which receives a blood specimen which causes a chemical reaction between the blood specimen, said fixed enzyme membrane sensor measuring the blood sugar concentration in the blood specimen as a function of a reaction current signal generated in the sensor by the chemical reaction, said apparatus having means for monitoring the temperature in the reaction cell, means for comparing said monitored temperature value with a predetermined, measurement range to ascertain whether the temperature of the reaction cell is outside of said predetermined temperature range, and visual display means for indicating when said temperature is outside of said predetermined temperature range.
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11. A blood sugar analyzing apparatus having a reaction cell which houses a fixed enzyme membrane sensor and a measuring electrode and which receives a blood specimen which causes a chemical reaction between the blood specimen, said fixed enzyme membrane sensor measuring the blood sugar concentration in the blood specimen on the basis of a reaction current signal generated in the sensor by the chemical reaction, said apparatus having means for monitoring the reaction current generated in the sensor, means for comparing the monitored value of reaction current with a predetermined reaction current measurement range to ascertain whether the reaction current is outside of said predetermined reaction current range, and visual display means for indicating when said reaction current is outside of said predetermined reaction current range.
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12. A blood sugar analyzing apparatus having a reaction cell which houses a fixed enzyme membrane sensor and a measuring electrode and which receives a blood specimen which causes a chemical reaction between the blood specimen, said fixed enzyme membrane sensor measuring the blood sugar concentration in the blood specimen as a function of a reaction current signal generated in the sensor by the chemical reaction, said apparatus having means for monitoring the reaction current offset, means for comparing the reaction current offset with a predetermined reaction current offset measurement range to ascertain whether the reaction current offset is outside said predetermined reaction current offset range, and visual display means for indicating when said reaction current is outside of said predetermined range.
- 13. A blood sugar analyzing apparatus having a reaction cell which houses a fixed enzyme membrane sensor and a measuring electrode and which receives a blood specimen, said fixed enzyme membrane sensor measuring the blood sugar concentration in the blood specimen on the basis of a reaction current signal generated in the sensor by the chemical reaction, said apparatus having means for storing data representing first and second conversion coefficient values obtained from two standard solutions having different blood sugar concentration values each in a different range corresponding to first and second ranges of reaction currents, respectively, means for determining which range of reaction current the measured reaction current from a blood test specimen falls within, and for calculating a blood sugar concentration value for the test specimen using the corresponding stored conversion coefficient value.
Specification