Blood component measuring device, method for measuring blood component, and bio-sensor
First Claim
1. A blood component measuring device that measures a blood component amount with a biosensor in which blood is introduced, and a blood component contained in the blood is oxidized and reduced by an oxidoreductase,the device comprising:
- a blood component amount measurement means that detects an oxidation-reduction current generated by the oxidation-reduction when a first voltage is applied to a first electrode pair of the biosensor, and that converts the oxidation-reduction current into the blood component amount;
a blood cell amount measurement means that detects a current generated when a second voltage is applied to a second electrode pair of the biosensor, and that converts the detected current into a blood cell amount contained in the blood;
a measurement control means that controls the blood component amount measurement means to apply the first voltage to the first electrode pair, to detect an oxidation-reduction current corresponding to the blood component amount more than once at predetermined timing of measurement of the blood component amount, and thus to measure the blood component amount more than once within a predetermined period after the introduction of the blood into the biosensor, and that also controls the blood cell amount measurement means to apply the second voltage in pulses to the second electrode pair within a predetermined short time before, during, or after the predetermined timing of the measurement of the blood component amount and only at timing of measurement of the blood cell amount in the predetermined period, to detect a current corresponding to the blood cell amount, and thus to measure the blood cell amount more than once within the predetermined period; and
a blood component amount correction means that corrects the blood component amount measured by the blood component amount measurement means based on at least a part of a plurality of blood component amounts measured by the blood component amount measurement means and a plurality of blood cell amounts measured by the blood cell amount measurement means under the control of the measurement control means.
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Abstract
Provided is a blood component measuring device or the like that can further suppress the measurement error of a blood component. The device detects an oxidation-reduction current generated by oxidation-reduction when a first voltage is applied to a first electrode pair 21, 22 of a biosensor 1, and converts the oxidation-reduction current (glucose response value) into a glucose conversion value. The device detects a current generated when a second voltage is applied to a second electrode pair 23, 24 of the biosensor 1, and converts the detected current (blood cell amount response value) into a blood cell amount conversion value. The glucose response value is measured more than once and the blood cell amount response value is also measured more than once within a predetermined period after the introduction of the blood into the biosensor 1. A CPU 72 corrects the glucose conversion value measured within the predetermined period based on at least a part of a plurality of glucose conversion values and a plurality of blood cell amount conversion values obtained from the results of measurement.
12 Citations
20 Claims
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1. A blood component measuring device that measures a blood component amount with a biosensor in which blood is introduced, and a blood component contained in the blood is oxidized and reduced by an oxidoreductase,
the device comprising: -
a blood component amount measurement means that detects an oxidation-reduction current generated by the oxidation-reduction when a first voltage is applied to a first electrode pair of the biosensor, and that converts the oxidation-reduction current into the blood component amount; a blood cell amount measurement means that detects a current generated when a second voltage is applied to a second electrode pair of the biosensor, and that converts the detected current into a blood cell amount contained in the blood; a measurement control means that controls the blood component amount measurement means to apply the first voltage to the first electrode pair, to detect an oxidation-reduction current corresponding to the blood component amount more than once at predetermined timing of measurement of the blood component amount, and thus to measure the blood component amount more than once within a predetermined period after the introduction of the blood into the biosensor, and that also controls the blood cell amount measurement means to apply the second voltage in pulses to the second electrode pair within a predetermined short time before, during, or after the predetermined timing of the measurement of the blood component amount and only at timing of measurement of the blood cell amount in the predetermined period, to detect a current corresponding to the blood cell amount, and thus to measure the blood cell amount more than once within the predetermined period; and a blood component amount correction means that corrects the blood component amount measured by the blood component amount measurement means based on at least a part of a plurality of blood component amounts measured by the blood component amount measurement means and a plurality of blood cell amounts measured by the blood cell amount measurement means under the control of the measurement control means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for measuring a blood component that measures a blood component amount with a biosensor in which blood is introduced, and a blood component contained in the blood is oxidized and reduced by an oxidoreductase,
the method comprising the following steps of: -
(i) detecting an oxidation-reduction current generated by the oxidation-reduction when a first voltage is applied to a first electrode pair of the biosensor, and converting the oxidation-reduction current into the blood component amount; and (ii) detecting a current generated when a second voltage is applied to a second electrode pair of the biosensor, and converting the detected current into a blood cell amount contained in the blood, wherein the blood component amount is measured more than once within a predetermined period after the introduction of the blood into the biosensor by applying the first voltage to the first electrode pair, and detecting an oxidation-reduction current corresponding to the blood component amount more than once at predetermined timing of measurement of the blood component amount, and the blood cell amount is also measured more than once within the predetermined period by applying the second voltage in pulses to the second electrode pair within a predetermined short time before, during, or after the predetermined timing of the measurement of the blood component amount and only at timing of measurement of the blood cell amount in the predetermined period, and detecting a current corresponding to the blood cell amount, and wherein the measured blood component amount is corrected based on at least a part of the plurality of blood component amounts measured and the plurality of blood cell amounts measured. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification