Method of measuring quantity of substrate
First Claim
1. A method of measuring a quantity of a substrate included in a sample liquid, comprising the steps of:
- providing a biosensor which includes;
an insulating board;
an electrode section formed on at least a part of the insulating board, the electrode section including a first electrode, a second electrode, and a third electrode;
a sample supplying path for supplying the sample liquid to the electrode section; and
a reagent layer for reacting with the sample liquid supplied through the sample supplying path;
providing a measuring device which includes;
a supporting section for detachably supporting the biosensor; and
a connecting terminal and a driving power supply for applying a voltage to the electrode section;
inserting the biosensor into the supporting section of the measuring device;
applying a voltage with the driving power supply to a first group of electrodes including the first electrode and the second electrode;
applying a voltage with the driving power supply to a second group of electrodes including the third electrode and one of the first electrode and the second electrode;
determining that the sample liquid is insufficient when the electric current from the second group of electrodes does not exceed a predetermined threshold within a given lapse of time after the electric current from the first group of electrodes exceeds the predetermined threshold; and
when it is determined that the sample liquid is insufficient, outputting, to outside of the measuring device, an indication to have a user add sample liquid to the sample supplying path.
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Accused Products
Abstract
A method of measuring a quantity of a substrate contained in sample liquid is provided. This method can reduce measurement errors caused by a biosensor. The biosensor includes at least a pair of electrodes on an insulating board and is inserted into a measuring device which includes a supporting section for supporting detachably the biosensor, plural connecting terminals to be coupled to the respective electrodes, and a driving power supply which applies a voltage to the respective electrodes via the connecting terminals. One of the electrodes of the biosensor is connected to the first and second connecting terminals of the measuring device only when the biosensor is inserted into the measuring device in a given direction, and has a structure such that the electrode becomes conductive between the first and second connecting terminals due to a voltage application by the driving power supply.
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Citations
8 Claims
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1. A method of measuring a quantity of a substrate included in a sample liquid, comprising the steps of:
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providing a biosensor which includes; an insulating board; an electrode section formed on at least a part of the insulating board, the electrode section including a first electrode, a second electrode, and a third electrode; a sample supplying path for supplying the sample liquid to the electrode section; and a reagent layer for reacting with the sample liquid supplied through the sample supplying path; providing a measuring device which includes; a supporting section for detachably supporting the biosensor; and a connecting terminal and a driving power supply for applying a voltage to the electrode section; inserting the biosensor into the supporting section of the measuring device; applying a voltage with the driving power supply to a first group of electrodes including the first electrode and the second electrode; applying a voltage with the driving power supply to a second group of electrodes including the third electrode and one of the first electrode and the second electrode; determining that the sample liquid is insufficient when the electric current from the second group of electrodes does not exceed a predetermined threshold within a given lapse of time after the electric current from the first group of electrodes exceeds the predetermined threshold; and when it is determined that the sample liquid is insufficient, outputting, to outside of the measuring device, an indication to have a user add sample liquid to the sample supplying path. - View Dependent Claims (2, 3, 4, 7, 8)
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5. The method of claim , further comprising the step of:
compensating a measured quantity of the substrate corresponding to an electric current detected at the electrode section depending on a lapse of time from when the electric current from the first group of electrodes exceeds the predetermined threshold until the electric current from the second group of electrodes exceeds the predetermined threshold. - View Dependent Claims (6)
Specification