JPH0894571A - Small simple sensor - Google Patents

Abstract

(57) [Summary] [Purpose] A small and simple sensor for easily measuring blood glucose, etc. by spotting blood etc. on a disposable chip. Manufacturing cost when manufacturing multiple types of sensors with different measurement components. To reduce. [Structure] The disposable chip 1 is printed with different enzyme reagents 4 according to the components to be measured, and any two of the connection terminals 8, 9 and 10 formed on the connector 7 of the sensor body 2 are printed. The electrodes 5 and 6 are formed at the contact positions. The sensor body 1 applicable to the illustrated chip is a land 1
1 and 13 are respectively short-circuited with solder to manufacture. As a result, even if the outer shape of the chip is the same, a proper chip 1
The measurement operation is not performed unless is attached.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small and simple sensor capable of easily measuring the concentration of a specific component from a trace amount of liquid sample, and is particularly effective when applied to a biosensor for measuring blood glucose level and the like. There is something.

[0002]

2. Description of the Related Art Conventionally, as a small and simple sensor, development of a biosensor capable of easily measuring the concentrations of glucose, lactic acid, urea, etc. from blood or urine at home has been advanced.
Among them, a small disposable chip that carries an enzyme that reacts with a specific component in a small amount of collected body fluid, and the reaction current obtained by the enzyme reaction is measured, and a small size that displays a value according to the concentration of the specific component is displayed. The biosensor, which is composed of the sensor body, can be easily and accurately measured by anyone and is expected to be widely used.

[0003]

By the way, in manufacturing the biosensor as described above, for example, a user does not mistakenly attach a chip for glucose measurement to the sensor body for lactate measurement by mistake. Must be devised.

Therefore, it is conceivable that only the dedicated chip is mounted on the sensor body by changing the outer shape of the chip or the shape of the mounting portion of the sensor body for each object to be measured.

However, making chips having different outer shapes or manufacturing sensor bodies having different mounting portion shapes necessitates a change in production equipment such as a molding die.
The manufacturing cost will be enormous.

[0006] Therefore, an object of the present invention is to provide a biosensor in which measurement is performed only when a proper chip is mounted, even if the chips have the same shape, which results in a large manufacturing cost. It is intended to reduce.

[0007]

In order to solve the above-mentioned problems, according to the present invention, the outer shape of the base material of the chip is the same, but the type of reaction reagent is changed depending on the measurement target and the position where the electrode is formed is changed. In the sensor body, a plurality of connection terminals capable of contacting the electrodes formed on the chip and a connection terminal of the plurality of connection terminals in contact with the electrodes are two positive and negative signals that lead to an electric circuit in the sensor body. It is composed of separate lands so that the wires can be selectively short-circuited with solder.

[0008]

According to the above structure, when the sensor main body corresponding to only a specific chip to be measured is manufactured, the connection terminal which is in contact with the electrode of the chip among the plurality of connection terminals and the signal connected to the electric circuit inside the main body are connected. Short the lands with solder so that the wires are connected.

As described above, by changing the electrode forming position on the chip side and changing the soldering position of the land on the sensor body side, a certain sensor body can be used only when a particular chip to be measured is mounted. You can turn it off. Therefore, it is possible to manufacture a plurality of types of biosensors even if the chip has the same outer shape.

[0010]

Embodiments of the small and simple sensor of the present invention will be specifically described below with reference to the drawings. Figure 1
FIG. 2 is a plan view of a biosensor according to an embodiment of the present invention, and FIG. 2 is a plan view of a chip used in the biosensor.

In FIG. 1, reference numeral 1 is a chip on which the collected body fluid is spotted, and 2 is an enlarged view of a mounting portion of the sensor main body 2 on which the chip 1 is mounted. The chip 1 includes an enzyme reagent 4 that reacts with spotted body fluid on a base material 3 obtained by punching a sheet of polyethylene resin or the like with a press, and an electrode terminal 5 for detecting a reaction current obtained by the enzyme reaction. , 6 are printed respectively.

Specifically, as shown in FIG. 2, the chip 1 has the same outer shape, but has three types (a), (b) and (c) depending on the type of enzyme reagent.
Different enzyme reagents are printed for each measurement target. Further, the printing positions of the electrode terminals 5 and 6 connected to the sensor body 2 are also different. (A) is at the upper end portion and the central portion, (b) is at both end portions, and (c) is the central portion and the lower end portion. Is being printed.

The mounting portion of the sensor main body 2 is provided with three connector terminals 8 so that the connector 7 formed by resin so as to engage with the outer shape of the chip 1 can be connected to the electrode terminals 5 and 6 of various chips 1. 9 and 10 are formed. 11, 12, 13,
Reference numeral 14 is a solder land, and by selectively separating the separated lands with solder, the signal lines 15 and 16 connected to an electric circuit inside the sensor body 2 not shown and the connection terminals 8, 9 and 10 are selectively formed. It is connectable.

Here, for example, in order to manufacture a sensor body using a chip of the type shown in FIG.
1 is short-circuited to connect the connection terminal 8 and the signal line 15, and the land 13 is short-circuited with solder to connect the connection terminal 9 and the signal line 16. Similarly, in the chip shown in (b), the land 11 and the land 14 are short-circuited, and in the chip shown in (c), the land 12 and the land 14 are short-circuited.
Short and.

Here, for example, even if a chip of the type shown in (b) or (c) is mounted on the sensor body 2 for (a) in which the land 11 and the land 13 are short-circuited,
Since the electrode terminals 5 and 6 are not connected to the internal electric circuit,
No measurement operation is performed. That is, the sensor body for (a) is not subjected to the measurement unless the chip having the electrode terminal dedicated for the sensor is mounted, so that the misuse can be prevented.

[0016]

As described above, according to the small and simple sensor of the present invention, measurement with different chips to be measured is impossible without changing the outer shape of the chip or the shape of the connector of the sensor body that engages with it. Can be Therefore, a plurality of types of chips and sensor bodies having different measurement targets can be produced in the same production facility, which is very effective in reducing the manufacturing cost.

[Brief description of drawings]

FIG. 1 is a plan view of a small and simple sensor showing an embodiment of the present invention.

FIG. 2 is a plan view of a chip used in the same embodiment.

[Explanation of symbols]

 1 chip 2 sensor body 3 base material 4 enzyme reagent 5,6 electrode 7 connector 8, 9, 10 connection terminal 11, 12, 13, 14 land 15, 16 signal line

Claims (1)

[Claims] 1. A chip in which a reaction reagent that reacts with a collected liquid sample and positive and negative electrodes for electrically detecting the concentration of a specific component from the reaction are formed on a base material, and a chip mounted on the chip. In a small and simple sensor consisting of a sensor body that detects and displays the level of a specific component by applying a voltage to the electrode, the chip is a reaction reagent formed on a substrate according to the specific component to be measured. And the electrodes are formed at different positions, and the sensor main body contacts a plurality of connection terminals capable of contacting the electrodes formed on the various chips and an electrode of the connection terminals. Small size characterized in that the connection terminal is composed of separate lands so that two positive and negative signal lines leading to an electric circuit in the sensor body can be selectively short-circuited by soldering. Easy sensor.