JP5467378B2 - Measuring instrument - Google Patents

Description

  The present invention relates to a measuring instrument, and more particularly to a measuring instrument that measures the amount of a component of a substrate of a specimen such as a body fluid.

  Conventionally, there is a sample sensor in which basic biological elements such as microorganisms, enzymes, antibodies, DNA, and RNA are applied as molecular identification elements. This analyte sensor uses a reaction that occurs when a basic biological element recognizes a substrate, for example, consumption of oxygen due to respiration of microorganisms, enzyme reaction, luminescence, etc. Detect presence.

  Among various types of specimen sensors, an enzyme sensor (a specimen sensor for detecting / quantifying a substrate by reacting with a target substrate using an enzyme) has been put into practical use. For example, an enzyme sensor using glucose, lactic acid, cholesterol, amino acid or the like as a target substrate is also called, for example, a glucose sensor or a cholesterol sensor based on the target substrate name, and is used in medical measurement, food industry, or the like. According to such a measurement method using an enzyme sensor, for example, an electron carrier is reduced by electrons generated by a reaction between a specific substance (substrate) contained in a specimen and an enzyme, and the reduction amount of the electron carrier is reduced. The substrate contained in the specimen is quantified by electrochemical measurement with a measuring instrument.

  One of the performances required for such a specimen sensor is that it is possible to accurately measure even a very small amount of specimen. For example, when a diabetic patient uses a glucose sensor, the specimen is often blood collected from the patient. In order to reduce the burden on the patient, it is desirable to collect as little blood as possible.

  As measuring instruments for testing specimens such as blood using a specimen sensor, those disclosed in Patent Document 1 and Patent Document 2 have been proposed. The measuring instrument is connected to the casing, a mounting portion provided in the casing and mounted with a specimen sensor to which blood is attached, a measurement circuit section connected to the specimen sensor, and the measurement circuit section. And a display unit. In addition, such a measuring device is configured to detect a conduction signal when the sample sensor is mounted on the mounting unit in order to automatically detect that the sample sensor has been inserted into the mounting unit. .

  When using a measuring instrument having such a configuration, first, a sample sensor is mounted on the mounting portion, and blood (sample) collected from a patient is spotted on the sample introduction portion of the sample sensor. This blood is taken into the sample sensor from the sample introduction part and reacts with the reagent in the sample sensor to chemically change. This chemical change is electrically measured by the measurement circuit unit, and the result is displayed on the display unit.

JP 2010-63577 A Japanese Patent Publication No. 8-20412

  There are various types of measuring instruments and specimen sensors as described above, and there are cases where a user of the measuring instrument has a plurality of types of measuring instruments and specimen sensors. Under such circumstances, a non-genuine sample sensor that is not compatible with the measuring instrument to be used (for example, a sample sensor manufactured by another company) may be erroneously inserted into the mounting portion. When a non-genuine sample sensor is inserted into the measuring instrument, the measuring instrument usually does not operate because it cannot detect the proper continuity signal when the sample sensor is inserted into the mounting part. However, depending on the type of measuring instrument and sample sensor, contact resistance when inserting the sample sensor into the measuring instrument may cause Even when the sample sensor is inserted into the measuring instrument, the measuring instrument may recognize that a genuine sample sensor has been inserted.

  In such a case, the user of the measuring device does not notice that the non-genuine sample sensor has been inserted into the measuring device (incorrect insertion of the sample sensor) and places a sample such as blood on the sample introduction part of the sample sensor. There is a problem in that the sample test is continued by wearing it, and the sample test cannot be performed accurately.

  Therefore, an object of the present invention is to provide a measuring instrument that can prevent erroneous insertion of a sample sensor.

The above object of the present invention is a measuring instrument for measuring the amount of a component of a substrate of a sample, comprising a mounting unit to which a sample sensor to which a sample is attached is mounted, and a control unit connected to the sample sensor. The control unit has a continuity detection unit that detects a continuity signal output value when the sample sensor is mounted on the mounting unit a plurality of times, and each detected continuity signal output value is predetermined. A threshold value determination unit that determines whether the threshold value is included in the threshold value range, and a conduction signal output value that is continuously within the threshold value range among the plurality of conduction signal output values sequentially detected by the conduction detection unit And a mounting determination unit that determines that the sample sensor mounted on the mounting unit is a genuine product when the number of the sensor is equal to or greater than a predetermined number .

  The above measuring device determines whether or not the output value of the continuity signal detected when the sample sensor is inserted into the measuring device is within a predetermined threshold range, and detects the plurality of detected signals. When the number of conduction signal output values within the threshold range is equal to or greater than a predetermined number, the sample sensor mounted on the mounting unit is determined to be a genuine product. Incorrect insertion can be effectively prevented. For example, even if a non-genuine sample sensor is inserted into the measuring instrument, even if temporary contact resistance occurs, this contact resistance is unstable and is detected when the sample sensor is inserted into the measuring instrument. The output value of the continuity signal does not become a value within a predetermined threshold range over a plurality of times. Therefore, it can be effectively prevented that when a non-genuine sample sensor is inserted into the mounting portion, it is erroneously determined that a genuine sample sensor has been inserted. The genuine sample sensor is a dedicated sample sensor used as a set with the measuring device and means a sample sensor that functions normally. Therefore, even if a sample sensor that is not used in combination with the measuring instrument or a dedicated sample sensor, a sample sensor having some abnormality is excluded from the concept of a genuine sample sensor.

  Further, in this measuring instrument, the mounting determination unit includes a predetermined number of conduction signal output values continuously within the threshold range among the plurality of conduction signal output values sequentially detected by the conduction detection unit. In this case, it is preferable to determine that the sample sensor mounted on the mounting unit is a genuine product.

  According to such a configuration, since it is determined under more severe conditions whether or not a genuine sample sensor has been inserted into the measuring instrument, it is possible to more effectively prevent erroneous insertion of the sample sensor. Become.

  In addition, it is preferable to further include a display unit that is connected to the mounting determination unit and displays that the sample sensor mounted on the mounting unit is a genuine product.

  According to such a configuration, since the display unit displays that the genuine sample sensor is mounted, the user of the measuring instrument can reliably confirm that the genuine sample sensor is mounted on the measuring instrument. Can be recognized.

  The attachment determination unit is attached to the attachment unit when the number of conduction signal output values that were within the threshold range among the detected plurality of conduction signal output values is less than a predetermined number. It is preferable to provide an alarm information output unit that outputs information that alerts that the sample sensor is not genuine.

  According to such a configuration, it is possible to reliably notify the user that a non-genuine sample sensor that is not compatible with the measuring device or a sample sensor having some abnormality is inserted into the measuring device. It is possible to effectively prevent the user of the instrument from continuing the sample test by mistakenly spotting a sample such as blood on the sample sensor.

  Moreover, it is preferable to include a threshold value storage unit that stores information about the predetermined threshold value, and a threshold value changing unit that changes information about the threshold value stored in the threshold value storage unit.

  Depending on the type of the non-genuine sample sensor, there is a type in which the continuity signal output value detected by the continuity detection unit when inserted into the measuring instrument is close to the continuity signal output value of the genuine sample sensor. In such a case, the measuring instrument cannot distinguish whether the inserted sample sensor is a genuine product or a non-genuine product. However, as described above, the information on the predetermined threshold is changed. By configuring so as to be able to perform, it becomes possible to detect erroneous insertion of a non-genuine sample sensor after the change of the threshold range in the measuring instrument.

  According to the present invention, it is possible to provide a measuring instrument that can prevent erroneous insertion of a sample sensor.

It is a schematic block diagram of the measuring device which concerns on one Embodiment of this invention. It is a block which shows the electrical structure of the measuring device shown in FIG. It is a schematic block diagram of the sample sensor with which a measuring device is mounted | worn. It is a schematic block diagram which shows the circuit structure which connects the control part with which the measuring device shown in FIG. 1 is equipped, and a sample sensor. It is explanatory drawing which shows the example of the threshold value memorize | stored in a threshold value memory | storage part. It is a flowchart which shows the action | operation of the conduction | electrical_connection detection part with which the measuring device shown in FIG. It is a flowchart which shows the action | operation in the modification of the mounting | wearing judgment part with which the measuring device shown in FIG. 1 is provided.

  Hereinafter, a measuring instrument according to an embodiment of the present invention will be described with reference to the accompanying drawings. A measuring instrument according to an embodiment of the present invention is a measuring instrument that measures the amount of a component of a substrate of a sample such as blood or urine, and is used in combination with a dedicated sample sensor. FIG. 1 is a schematic configuration diagram of a measuring instrument 1 according to an embodiment of the present invention, and FIG. 2 is a block diagram showing an electrical configuration of the measuring instrument 1. FIG. 3 is a schematic configuration diagram of the sample sensor 50 attached to the measuring instrument 1.

  First, the sample sensor 50 attached to the measuring instrument 1 will be described. This specimen sensor 50 is a replaceable sensor, and as shown in FIG. 3, a substrate 51 made of an insulator, a measurement working electrode 52 provided on the substrate 51, and a fixed interval from the measurement working electrode 52. A counter electrode 53 for measurement provided on the substrate 51 with a gap, a reaction part 54 provided on the working electrode 52 for measurement and the counter electrode 53 for measurement, and a specimen for introducing a specimen such as blood to the reaction part 54 And an introduction part 55. The sample sensor 50 includes terminals 56 and 57 extended from the measurement working electrode 52 and the measurement counter electrode 53, respectively, and a mounting confirmation terminal 58 provided at a predetermined interval from the terminals 56 and 57. ing.

  The insulator constituting the substrate 51 is, for example, polyethylene terephthalate (PET), polyethylene naphthalate, a polyester resin sheet such as a biodegradable polyester resin composed of an aliphatic unit and an aromatic unit, heat resistance, chemical resistance, and strength. Such as a polyamide sheet, a plastic sheet such as a polyimide film sheet, and an inorganic substrate such as a ceramic.

  Both the electrodes 52 and 53 are formed in a substantially semicircular shape, and the both electrodes 52 and 53 are formed in a substantially circular shape. The semicircular straight portions are opposed to each other at a constant interval. Both electrodes 52 and 53 are formed of a conductor such as platinum, gold, palladium, or indium-tin oxide. As a forming method, hot stamping or the like can be considered, but a method by vacuum deposition or sputtering is preferable because a fine electrode pattern can be formed with high accuracy. In the case of sputtering, it can be formed at once by masking the outside of the formation of both electrodes.

  The reaction unit 54 includes an oxidoreductase and an electron acceptor. When a specimen such as blood adheres on the reaction part 54, the reaction part 54 reacts with the specimen, and exchange of electrons occurs between the electrodes 52 and 53. At this time, transfer of electrons proportional to the amount of the component of the sample substrate such as blood glucose level can be caused by the material of the reaction unit 54. The reaction part 54 is formed by dropping a liquid material at a desired position with a dispenser and drying it.

  The sample introduction unit 55 is configured by a tip edge of a cover 60 provided on the substrate 51 via a spacer 59 and a tip edge of the substrate 51. That is, the sample introduction part 55 is configured by a gap generated between the front edges by the spacer 59. The specimen introduced from the specimen introduction part 55 can reach the leading edge 61 of the spacer 59 by capillary action.

  Next, the measuring device 1 will be described. As shown in FIG. 1 and FIG. 2, the measuring instrument 1 includes a measuring instrument main body 2, a mounting part 3, a display part 4, an operation part 5, a power supply part 6 and a control part 7. The measuring instrument main body 2 is a casing formed of a material such as synthetic resin, and houses a power supply unit 6 and a control unit 7 therein.

  The mounting part 3 is a part into which the sample sensor 50 is inserted, and includes a hollow part 31 provided at the peripheral part of the measuring instrument main body 2. A connector (not shown) connected to a terminal formed on the sample sensor 50 is provided at the back of the hollow portion 31, and this connector is connected to the control unit 7 via a circuit.

  The circuit that connects the sample sensor 50 and the control unit 7 has the configuration shown in FIG. 4. When the sample sensor 50 is inserted into the mounting unit 3, the measurement working electrode 52 and the measurement counter electrode 53 are respectively connected. Terminals 9 and 10 that are individually connected to the extended terminals 56 and 57 and terminals 11 and 12 that are connected to the mounting confirmation terminal 58 are provided. The terminals 11 and 12 are electrically connected via a mounting confirmation terminal 58.

  The display unit 4 is a liquid crystal monitor or the like that displays an error message indicating that the sample sensor 50 is mounted on the mounting unit 3, the measurement result of the component amount of the sample substrate, or the measurement was not performed correctly. The control unit 7 is electrically connected. The display unit 4 is installed in the measuring instrument main body 2 so that a display screen such as a liquid crystal is exposed to the outside.

  The operation unit 5 is used to input an operation signal to the measuring instrument 1. For example, an operation button for instructing power on / off, an operation button for instructing reading of measurement data, and a sample measurement are continued. The operation button etc. which instruct | indicate that are provided, and are electrically connected to the control part 7. FIG. Each operation button is installed in the measuring device main body 2 so as to be exposed to the outside.

  The power supply unit 6 supplies driving power to the components of the measuring instrument 1 such as the display unit 4 and the control unit 7 and is constituted by a battery. As a battery used for the power supply unit 6, a commercially available battery or a dedicated rechargeable battery can be used. Note that the power supply unit 6 may be configured to be supplied with power from a commercial power supply by inserting an AC plug into an AC outlet instead of the battery.

  As shown in the block of FIG. 2, the control unit 7 includes a continuity detection unit 71, a threshold determination unit 72, a mounting determination unit 73, and a sample measurement unit 74.

  The continuity detection unit 71 has a function of detecting a continuity signal output value generated when the sample sensor 50 is mounted on the mounting unit 3 over a plurality of times. Specifically, the resistance value (conduction signal output value) between the terminals 11 and 12 connected via the mounting confirmation terminal 58 of the specimen sensor 50 is detected a plurality of times. The time interval for detecting the resistance value and the number of times of detection are not particularly limited. For example, the resistance value is detected 10 times every 10 msec. In the present embodiment, the resistance value between the terminals 11 and 12 is adopted as the conduction signal detected by the conduction detecting unit 71. In addition to the resistance value, the voltage value or current value between the terminals 11 and 12 is also used. May be detected.

  The threshold determination unit 72 has a function of determining whether or not each conduction signal output value detected by the conduction detection unit 71 is included in a predetermined threshold range. The threshold value determination unit 72 includes a threshold value storage unit 72a that stores information on a predetermined threshold value serving as a determination reference. Here, since the measuring instrument 1 is required to have high measurement accuracy, it is necessary to confirm that the required measurement accuracy is maintained in the manufacturing stage and the use stage. For this reason, in addition to the sample sensor 50 that is actually used with the sample attached, various test chips for testing are mounted on the mounting unit 3 to check the operation. Under such circumstances, since it is necessary to accurately recognize whether the device mounted on the measuring instrument 1 is the sample sensor 50 or the test chip, it is set individually for each sample sensor 50 and test chip. The threshold value is stored in the threshold value storage unit 72a. An example of the threshold value stored in the threshold value storage unit 72a is shown in the explanatory diagram of FIG. In FIG. 5, a resistance value is adopted as the conduction signal detected by the conduction detection unit 71. As can be seen from FIG. 5, it is determined that the sample sensor 50 is attached within the range of threshold A to threshold B, and it is determined that the inspection chip a is attached within the range of threshold C to threshold D. Similarly, the inspection chip b is in the range of threshold E to threshold F, the inspection chip c is in the range of threshold G to threshold H, and the inspection chip d is in the range of threshold I to threshold J. , It is determined that each is mounted. The threshold ranges of the sample sensor 50 and the test chips a to d can be set variously. For example, the threshold range of the sample sensor 50 is 0 ± 20Ω, and the threshold ranges of the test chips a to d are respectively set. 3.9 kΩ ± 20Ω, 6.2 kΩ ± 20Ω, 8.2 kΩ ± 20Ω, 10 kΩ ± 20Ω.

  When the number of conduction signal output values that are within the threshold range among the detected plurality of conduction signal output values is equal to or greater than a predetermined number, the attachment determination unit 73 is the sample sensor 50 attached to the attachment unit 3. The function of determining that the (or testing chip) is a genuine product, and when it is determined that the genuine sample sensor 50 (or testing chip) is mounted on the mounting unit 3, the information is displayed on the display unit 4. It has a function to issue a command to display. For example, when the continuity detection unit 71 detects the resistance value (conduction signal output value) 10 times every 10 msec, the threshold determination unit 72 may have 3 or more continuity signal output values within the threshold range. For example, it is determined that an appropriate sample sensor 50 (or test chip) is mounted on the mounting unit 3, and a command to display the information on the display unit 4 is issued. The “predetermined number” that is the determination criterion in the mounting determination unit 73 varies depending on the detection accuracy of the continuity detection unit 71 and the accuracy of creating the resistance value of the mounting confirmation terminal 58 in the sample sensor 50 (or the testing chip). And is not limited to the number “3”.

  The operations of the continuity detection unit 71, the threshold determination unit 72, and the mounting determination unit 73 will be described in detail with reference to the flowchart shown in FIG. It is assumed that the conduction signal output value detected by the conduction detecting unit 71 is a resistance value, and the resistance value is detected 10 times every 10 msec. Further, when the number of resistance values within the threshold range among the detected plurality of resistance values is 3 or more, the attachment determination unit 73 determines that the genuine sample sensor 50 (or the testing chip) Assume that it is determined to be attached to the attachment portion 3.

  First, the sample sensor 50 or the inspection chip is mounted on the mounting portion 3 of the measuring instrument 1. Thereby, the terminals 11 and 12 in the circuit are electrically connected via the mounting confirmation terminal 58. The continuity detection unit 71 detects the resistance values of the terminals 11 and 12 (resistance value detection), and the threshold value determination unit 72 includes the detected resistance value in any range of each threshold range stored in the storage unit. (Threshold judgment). At this time, the storage unit included in the continuity detection unit 71 stores the resistance value detection count as “1” (the value of the total counter is stored as “1”).

  When the threshold determination unit 72 determines that the threshold value is within the threshold range of the sample sensor 50, the number of conduction signal output values that were within the threshold range of the sample sensor 50 is stored as “1” (sensor The counter value is stored as “1”).

  In addition, when the threshold determination unit 72 determines that it is within the threshold range of any of the inspection chips a to d, the number of conduction signal output values within the threshold range of the corresponding inspection chip is “ Is stored as “1” (the value of the chip counter of any of the inspection chips a to d is stored as “1”).

  Next, “1” is added to “1” of the number of detections of the resistance value in the above-described continuity detection unit 71 to “2”, and the continuity detection unit 71 detects the resistance value of the terminals 11 and 12 again (resistance value) Detection), the threshold determination unit 72 determines in which range of the respective threshold ranges stored in the storage unit the detected resistance value is included (threshold determination). When the threshold determination unit 72 determines that the threshold value is within the threshold range of the sample sensor 50, 1 is added to the number “1” of the conduction signal output values within the threshold range of the sample sensor 50 to “2”. To do. If it is determined that the threshold value is within the threshold range of any of the inspection chips a to d, the number of conduction signal output values that are within the threshold range of the corresponding inspection chip is increased by 1 to “2”. “Yes.

  For example, if the number of conduction signal output values that were within the threshold range of the sample sensor 50 is “3”, what is mounted on the mounting unit 3 is the genuine sample sensor 50. And final determination of the sensor mounted on the mounting portion 3 is completed. Similarly, if the number of conduction signal output values within the threshold range of each inspection chip is “3”, it is finally determined that what is attached to the attachment portion 3 is a genuine inspection chip, The determination of the sensor mounted on the mounting unit 3 is terminated. After the determination of the sensor mounted on the mounting unit 3 is completed, the mounting determination unit 73 displays information indicating that the genuine sample sensor 50 (or test chip) is mounted on the mounting unit 3. Issue a command to display on 4.

  Further, even when the number of detections of the resistance value in the continuity detection unit 71 reaches “10”, the number of continuity signal output values within the threshold range of the sample sensor 50 is “3” or more, or the threshold value of the test chip If the number of conduction signal output values within the range does not become “3” or more, it is determined that the one attached to the attachment unit 3 is not an appropriate sample sensor 50 or a test chip, and the attachment unit 3 The attached sensor discrimination process is terminated.

  The sample measurement unit 74 has a function of measuring the current flowing between the measurement working electrode 52 and the measurement counter electrode 53 and determining the amount of the substrate component of the sample that has reacted with the enzyme from the measured current value. . The sample measurement unit 74 may be configured to include a storage unit that stores various data related to the obtained substrate component amount.

  The measuring instrument 1 according to the present embodiment determines whether or not the output value of the conduction signal detected when the sample sensor 50 (or the testing chip) is inserted into the measuring instrument 1 is within a predetermined threshold range. When the number of conduction signal output values that were within the threshold range among a plurality of detected conduction signal output values is equal to or greater than a predetermined number, the genuine specimen sensor 50 (or test) Therefore, it is possible to effectively prevent the sample sensor 50 (or the test chip) from being erroneously inserted. For example, even if a non-genuine sample sensor is inserted into the measuring instrument 1, even if a temporary contact resistance occurs, the contact resistance is unstable, so an non-genuine sample sensor is inserted into the measuring instrument 1. The output value of the continuity signal detected at the time of being set does not become a value within a predetermined threshold range for a plurality of times. Therefore, it can be effectively prevented that when the non-genuine sample sensor is inserted into the mounting portion 3, it is erroneously determined that the genuine sample sensor 50 is inserted.

  In addition, the measuring instrument 1 according to the present embodiment is connected to the mounting determination unit 73 included in the control unit 7 and displays that the specimen sensor 50 (or the testing chip) which is a genuine product is mounted on the mounting unit 3. Since the display unit 4 is provided, the user of the measuring instrument 1 can surely recognize that the specimen sensor 50 (or inspection chip), which is a genuine product, is attached to the measuring instrument 1.

  As mentioned above, although embodiment of the measuring device 1 based on this invention was described, a specific structure is not limited to the said embodiment. For example, as shown in the flowchart of FIG. 7, in the above-described embodiment, the continuity signal that is continuously within the threshold range among the plurality of continuity signal output values detected by the continuity detection unit 71 sequentially by the attachment determination unit 73. When the number of output values is equal to or greater than a predetermined number, it may be configured that it is determined that a genuine sample sensor 50 (or a test chip) is mounted on the mounting unit 3.

  According to such a configuration, the determination as to whether or not the genuine sample sensor 50 (or test chip) has been inserted into the measuring instrument 1 is performed under more severe conditions, and therefore the sample can be more effectively performed. It becomes possible to prevent erroneous insertion of the sensor 50 (or inspection chip). For example, even if a non-genuine sample sensor is inserted into the measuring instrument 1, even if a temporary contact resistance occurs, this contact resistance is unstable, and therefore when the sample sensor is inserted into the measuring instrument 1. The output value of the detected conduction signal does not continuously become a value within the predetermined threshold range over a plurality of times. Therefore, it can be more reliably prevented that the genuine sample sensor 50 is erroneously determined to be inserted when the non-genuine sample sensor is inserted into the mounting portion 3.

  Moreover, in the said embodiment, the mounting | wearing judgment part 73 is a regular product when the number of conduction | electrical_connection signal output values which were in the threshold value range is less than predetermined number among the detected several conduction | electrical_connection signal output values. You may comprise so that the alarm information output part which outputs the information which alert | reports that the sample sensor 50 (or test | inspection chip | tip) is not mounted | worn with the mounting part 3 may be provided. When such a configuration is adopted, it is possible to reliably notify the user that an improper sample sensor that is not compatible with the measuring instrument 1 or a sample sensor having some abnormality is inserted into the measuring instrument 1. Therefore, it is possible to effectively prevent the user of the measuring instrument 1 from continuing the sample test by mistakenly spotting a sample such as blood on the sample introduction part of the sample sensor.

  Moreover, in the said embodiment, you may comprise so that the threshold value change part which changes the information regarding the threshold value stored in the threshold value memory | storage part 72a may be further provided. Depending on the type of the non-genuine sample sensor, the continuity signal output value detected by the continuity detection unit 71 when inserted into the measuring instrument 1 is close to the continuity signal output value of the regular sample sensor 50. Exists. In such a case, the measuring instrument 1 may not be able to distinguish whether the inserted specimen sensor is a genuine product or a non-genuine product. However, as described above, information on a predetermined threshold value may be used. By configuring so that it can be changed, it is possible to detect erroneous insertion of a non-genuine sample sensor after the threshold range of the measuring instrument 1 is changed. Specifically, it is possible to determine whether the inserted specimen sensor is a genuine product or a non-genuine product by making a change such as narrowing the threshold range.

DESCRIPTION OF SYMBOLS 1 Measuring device 2 Measuring device main body 3 Mounting part 31 Hollow part 4 Display part 5 Operation part 6 Power supply part 7 Control part 71 Continuity detection part 72 Threshold determination part 72a Threshold storage part 73 Attachment determination part 74 Sample measurement part 9,10, 11, 12 Terminal 50 Sample sensor 51 Substrate 52 Measuring working electrode 53 Measuring counter electrode 54 Reaction unit 55 Sample introducing unit 56, 57 Terminal 58 Mounting confirmation terminal

Claims (4)

A measuring instrument for measuring the amount of a substrate component of a specimen,
A mounting unit on which a sample sensor to which a sample is attached is mounted; and a control unit connected to the sample sensor;
The controller is
A continuity detection unit for detecting a continuity signal output value when the sample sensor is mounted on the mounting unit a plurality of times;
A threshold determination unit that determines whether or not each detected conduction signal output value is included within a predetermined threshold range;
When the number of conduction signal output values continuously within the threshold range among the plurality of conduction signal output values sequentially detected by the conduction detection unit is equal to or greater than a predetermined number, the conduction signal is attached to the attachment unit. And a mounting determination unit that determines that the sample sensor is a genuine product. The measuring instrument according to claim 1, further comprising a display unit that is connected to the mounting determination unit and displays that the sample sensor mounted on the mounting unit is a genuine product. The attachment determination unit is attached to the attachment unit when the number of conduction signal output values that were within the threshold range among a plurality of detected conduction signal output values is less than a predetermined number. The measuring device according to claim 1, further comprising an alarm information output unit that outputs information that urges that the sample sensor is not a genuine product. A threshold value storage unit for storing information on the predetermined threshold value;
Measuring instrument according to any one of claims 1-3; and a threshold value changing unit for changing the information on the threshold stored in the threshold storage unit.