Biosensor, biosensor chip, and biosensor device
First Claim
Patent Images
1. A biosensor device, comprising:
- a biosensor including;
a working electrode to be in contact with an assayed fluid during an assay;
a counter electrode to be in contact with the assayed fluid during an assay, the counter electrode opposing the working electrode with an interval therebetween for allowing a flow of the assayed fluid;
a working electrode terminal connected to the working electrode;
a counter electrode terminal connected to the counter electrode; and
a working electrode reference terminal connected to the working electrode; and
a measurement circuit connected to the biosensor,wherein the measurement circuit generates first and second base voltages, applies voltage to the working electrode terminal so that a voltage at the working electrode reference terminal equals the first base voltage, applies the second base voltage to the counter electrode terminal, and detects a current according to a current flowing between the working electrode and the counter electrode.
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Abstract
A biosensor includes a working electrode 101, a counter electrode 102 opposing the working electrode 101, a working electrode terminal 103 and a working electrode reference terminal 10 connected to the working electrode 101 by wires, and a counter electrode terminal 104 connected to the counter electrode 102 by a wire. By employing a structure with at least three electrodes, it is possible to assay a target substance without being influenced by the line resistance on the working electrode side.
36 Citations
49 Claims
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1. A biosensor device, comprising:
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a biosensor including; a working electrode to be in contact with an assayed fluid during an assay; a counter electrode to be in contact with the assayed fluid during an assay, the counter electrode opposing the working electrode with an interval therebetween for allowing a flow of the assayed fluid; a working electrode terminal connected to the working electrode; a counter electrode terminal connected to the counter electrode; and a working electrode reference terminal connected to the working electrode; and a measurement circuit connected to the biosensor, wherein the measurement circuit generates first and second base voltages, applies voltage to the working electrode terminal so that a voltage at the working electrode reference terminal equals the first base voltage, applies the second base voltage to the counter electrode terminal, and detects a current according to a current flowing between the working electrode and the counter electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A biosensor chip, comprising:
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a biosensor including; a working electrode to be in contact with an assayed fluid during an assay; a counter electrode to be in contact with the assayed fluid during an assay, the counter electrode opposing the working electrode with an interval therebetween for allowing a flow of the assayed fluid; a sensor section for holding the assayed fluid; a working electrode terminal connected to the working electrode;
a counter electrode terminal connected to the counter electrode; anda working electrode reference terminal connected to the working electrode, the biosensor being provided on a substrate; and a measurement circuit connected to the biosensor, wherein the measurement circuit generates first and second base voltages, applies voltage to the working electrode terminal so that a voltage at the working electrode reference terminal equals the first base voltage, applies the second base voltage to the counter electrode terminal, and detects a current according to a current flowing between the working electrode and the counter electrode. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A biosensor device comprising:
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a biosensor including; a working electrode to be in contact with an assayed fluid during an assay; a counter electrode to be in contact with the assayed fluid during an assay, the counter electrode opposing the working electrode with an interval therebetween for allowing a flow of the assayed fluid; a working electrode terminal connected to the working electrode; a counter electrode terminal connected to the counter electrode; and a counter electrode reference terminal connected to the counter electrode; and a measurement circuit connected to the biosensor, wherein the measurement circuit generates first and second base voltages, applies voltage to the counter electrode terminal so that a voltage at the counter electrode reference terminal equals the second base voltage, applies the first base voltage to the working electrode terminal, and detects a current according to a current flowing between the working electrode and the counter electrode. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A biosensor chip, comprising:
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a biosensor including; a working electrode to be in contact with an assayed fluid during an assay; a counter electrode to be in contact with the assayed fluid during an assay, the counter electrode opposing the working electrode with an interval therebetween for allowing a flow of the assayed fluid; a sensor section for holding the assayed fluid; a working electrode terminal connected to the working electrode; a counter electrode terminal connected to the counter electrode; and a counter electrode reference terminal connected to the counter electrode, the biosensor being provided on a substrate; and a measurement circuit connected to the biosensor, wherein the measurement circuit generates first and second base voltages, applies voltage to the counter electrode terminal so that a voltage at the counter electrode reference terminal equals the second base voltage, applies the first base voltage to the working electrode terminal, and detects a current according to a current flowing between the working electrode and the counter electrode. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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Specification