Method of measuring blood component, sensor used in the method, and measuring device
First Claim
1. A measuring device for measuring a component in blood, comprising:
- a sensor, comprising;
a first analysis portion for measuring the component in the blood sample, comprising an electrode system, an oxidoreductase that acts upon the component, and a mediator are provided; and
a second analysis portion for measuring a Hct value of the blood sample, comprising an electrode system that comprises a working electrode and a counter electrode, a mediator being provided on the counter electrode but not on the working electrode for measuring the Hct value, whereinthe first analysis portion measures the component in the blood with a redox reaction between the component and the oxidoreductase in the presence of the mediator by application of a voltage to the electrode system of the first analyzing portion and detecting an oxidation current or a reduction current caused to flow,the second analysis portion measures the Hct value of the blood sample by application of a voltage to the blood supplied to the second analysis portion, and detecting a value of the oxidation current or the reduction current, andthe oxidoreductase and the mediator of the first analysis portion are present on the counter electrode of the second analysis portion;
a holder that holds the sensor;
a voltage source for the first analysis portion of the sensor;
a detector that detects an oxidation current or a reduction current of the first analysis portion;
a calculator that calculates an amount of the component from a value of the detected current of the first analysis portion;
a voltage source for the second analysis portion of the sensor;
a detector that detects an oxidation current or a reduction current of the second analysis portion;
a calculator that calculates a Hct value of the blood from a value of the detected oxidation or reduction current of the second analysis portion, the calculated amount of the component being corrected using the Hct value; and
a controller configured to direct application of a voltage by the voltage source for the first analysis portion, communicate with the detector of the first analysis portion, direct application of a voltage by the voltage source for the second analysis portion, and communicate with the detector of the second analysis portion.
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Accused Products
Abstract
The present invention provides a method of measuring a component in blood, by which an amount of the component can be corrected accurately by measuring a hematocrit (Hct) value of the blood with high accuracy and high reliability and also provides a sensor used in the method. The sensor for measuring a component in blood has a first analysis portion and a second analysis portion. The first analysis portion has a first electrode system (11,12) and a reagent layer (14), and the reagent layer (14) has an oxidoreductase that acts on the component and a mediator. In the first analysis portion, the component in the blood is measured by causing a redox reaction of the component with the oxidoreductase in the presence of the mediator and detecting a redox current caused when a voltage is applied by the first electrode (11,12). The second analysis portion has a working electrode and a counter electrode, and a mediator is provided on the counter electrode but not on the working electrode. In the second analysis portion, a Hct value of the blood is measured by supplying the blood to the electrode system, applying a voltage to cause a current to flow, and detecting a value of the current. Using this Hct value, the amount of the component is corrected.
52 Citations
25 Claims
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1. A measuring device for measuring a component in blood, comprising:
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a sensor, comprising; a first analysis portion for measuring the component in the blood sample, comprising an electrode system, an oxidoreductase that acts upon the component, and a mediator are provided; and a second analysis portion for measuring a Hct value of the blood sample, comprising an electrode system that comprises a working electrode and a counter electrode, a mediator being provided on the counter electrode but not on the working electrode for measuring the Hct value, wherein the first analysis portion measures the component in the blood with a redox reaction between the component and the oxidoreductase in the presence of the mediator by application of a voltage to the electrode system of the first analyzing portion and detecting an oxidation current or a reduction current caused to flow, the second analysis portion measures the Hct value of the blood sample by application of a voltage to the blood supplied to the second analysis portion, and detecting a value of the oxidation current or the reduction current, and the oxidoreductase and the mediator of the first analysis portion are present on the counter electrode of the second analysis portion; a holder that holds the sensor; a voltage source for the first analysis portion of the sensor; a detector that detects an oxidation current or a reduction current of the first analysis portion; a calculator that calculates an amount of the component from a value of the detected current of the first analysis portion; a voltage source for the second analysis portion of the sensor; a detector that detects an oxidation current or a reduction current of the second analysis portion; a calculator that calculates a Hct value of the blood from a value of the detected oxidation or reduction current of the second analysis portion, the calculated amount of the component being corrected using the Hct value; and a controller configured to direct application of a voltage by the voltage source for the first analysis portion, communicate with the detector of the first analysis portion, direct application of a voltage by the voltage source for the second analysis portion, and communicate with the detector of the second analysis portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification