JPH10253570A - Concentration-measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concentration-measuring device capable of extremely simplifying the operation for setting and ejection of a sensor. SOLUTION: A cartridge 2 that accommodates a number of sensors 2 while they are being energized upward, is placed on a concentration-measuring device body 3. As cam member 4b that moves following the press member 4 and a lever member 4d for limiting the reciprocating move of the cam member 4b while being engaged to the cam member 4b are provided and an engagement order prescription part for setting the change in the engagement position between the cam member 4b and the lever member 4d to a specific order is provided so that the uppermost sensor 1 is pushed by a press member so that it projects from the concentration-measuring device body 3, the going-move length and the returning-move length of the press member 4 are pushed out by nearly 1/2 of the sensors 1 on a first going-move and the sensors 1 are pushed out by nearly the total length of the sensors 1 on a second going-move.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concentration measuring device, and more particularly, to a concentration measuring device which is produced or eliminated by oxidizing or reducing a substance to be measured in the presence of a physiologically active substance. The present invention relates to a concentration measuring device that receives an electric signal corresponding to an amount from an electrode of a sensor and outputs a dark rotation degree measurement signal based on the electric signal.

[0002]

2. Description of the Related Art Conventionally, a membrane comprising a physiologically active substance such as an enzyme immobilized on an upper surface of an electrode body having a working electrode, a counter electrode and an optional reference electrode (hereinafter simply referred to as immobilized enzyme membrane). It has been proposed to measure the concentration of a target substance in a solution using a sensor provided with the same. If glucose oxidase is employed as the physiologically active substance, it can be applied to the measurement of the concentration of sugar.

[0003] However, when measuring the sugar concentration in blood, the blood glucose level is measured using the sensor having the above-described structure because of the large amount of interfering substances such as blood cells in the blood. Is repeatedly measured, there is a high possibility that the measured values after the second time will be inaccurate. In particular, in the case of a blood glucose level measuring device that is intended for use in ordinary households, in order to prevent the measurement value from being inaccurate, a sensor is mounted in advance and the blood glucose level is measured. In order to perform measurement, it is instructed that a new sensor should be attached to the blood glucose level measuring device.

[0004] In this way, the inconvenience of repeatedly measuring the blood sugar level without replacing the sensor can be prevented.

[0005]

However, when the above-described blood sugar level measuring device is employed, it is necessary to take out the individually mounted sensor and set it in the blood sugar level measuring device before measuring the blood sugar level. In addition to this, it is necessary to take out the used sensor from the blood sugar level measuring device after the measurement of the blood sugar level is completed.

[0006] Since the sensor is remarkably miniaturized in order to reduce the required amount of blood as much as possible, there is a disadvantage that the above operation is difficult and troublesome. In addition, there is a possibility that the sensor is not set correctly, and in this case, there is a disadvantage that the output signal from the sensor cannot be taken out and the blood glucose level cannot be measured.

Although only the blood sugar level measuring device has been described above, the same disadvantages may occur in a concentration measuring device for measuring the concentration of another substance as long as the sensor needs to be replaced for each measurement. There is.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and can greatly simplify the operation of setting a sensor before measurement and taking out the sensor after measurement. It is an object of the present invention to provide a concentration measuring device capable of accurately setting the concentration.

[0009]

According to a first aspect of the present invention, there is provided a concentration measuring apparatus which outputs a concentration measuring signal by inputting an output signal from a sensor and a cartridge having a plurality of concentration measuring sensors stacked therein. A concentration measuring device main body having a signal processing unit, wherein the cartridge is removably mounted on the concentration measuring device main body, and the cartridge applies a pressing force to move the sensor toward the opening of the cartridge. A pressing member having an urging member, wherein the concentration measuring device main body extrudes a sensor located at the opening of the cartridge from the concentration measuring device main body, and a pressing member urging member for urging the pressing member in a direction opposite to the pushing direction And a cam member, which is engaged with the cam member to control the backward movement position of the pressing member by the pressing member urging member and the forward movement position of the pressing member by the pressing force. And an engaging member which, cam member,
One of the engaging members is provided integrally with the pressing member,
A first positioning portion for setting the position of the cam member when the first pressing member is pressed so as to push the sensor out of the concentration measuring device main body by a predetermined length shorter than the entire length thereof; And a second positioning portion for setting the return position of the pressing member to prevent movement of the second sensor by the sensor urging means, and setting the position of the second pressing member at the time of pressing the sensor to substantially the entire length thereof. A third positioning portion that is set so as to be pushed out from the main body of the concentration measuring device, and a return position of the pressing member at the time of releasing the second pressing force is set so as to allow movement of the second sensor by the sensor urging means. The fourth positioning portion, the cam member and the engaging member are connected to the first positioning portion, the second positioning portion, the third positioning portion, and the fourth positioning portion.
And an engagement order defining portion that allows engagement in the order of the positioning portion and prevents engagement in the reverse order.

According to a second aspect of the present invention, there is provided a concentration measuring apparatus which further includes a rotating member which is vertically rotatable and has an electrode on a side close to the sensor as a body of the concentration measuring apparatus. An electrode further including an electrode for external connection at a predetermined position near the side is adopted, and as the cam member, the rotating member is turned toward the sensor at least corresponding to the second positioning portion, so that the turning member The electrode of the rotation member is electrically connected to the electrode and an electrode for external connection of the sensor, and the rotation member is rotated in a direction away from the sensor at least corresponding to the third positioning portion and the fourth positioning portion. And a cam portion for preventing electrical connection between the sensor and an electrode for external connection of the sensor.

[0011]

According to the first aspect of the present invention, when the cartridge is mounted on the main body of the concentration measuring device, a large number of sensors in the cartridge are urged toward the opening of the cartridge by the sensor urging member. I have. In this state, if the pressing member is moved forward against the pressing member urging member, the pressing member can move in the direction in which the first sensor pushes out the first sensor from the concentration measuring device main body. Since this movement of the pressing member is the first time, the sensor is pushed out by a predetermined length shorter than the entire length by moving forward until the cam member and the engaging member engage at the first positioning portion. Next, when the pressing force of the pressing member is released, the pressing member is moved back by the pressing member urging member, and the cam member and the engaging member are moved back until the cam is engaged with the engaging member at the second positioning portion. Return is prevented. Note that the sensor does not return and continues to be held at the pushing position. A solution to be measured (a solution containing a substance to be measured) can be easily spotted on the extruded sensor. Then, a signal corresponding to the concentration of the substance to be measured is output from the sensor, and this signal is guided to a signal processing unit included in the concentration measuring device main body to output a concentration measurement signal. In the case where the pressing force on the pressing member is released, the reversing distance of the pressing member by the pressing member urging member is limited by the cam member and the engaging member. Movement by the urging member (a state where the second sensor can be pushed out by the pressing member) can be reliably prevented.

After the density measurement, if the pressing member is moved forward again against the pressing member urging member, the cam member and the engaging member are moved forward until they engage at the third positioning portion. This allows the pressing member to push the first sensor further out of the concentration measuring device main body, and to drop this sensor from the concentration measuring device main body. Thereafter, the pressing force on the pressing member may be released, and the pressing member is moved backward by the urging force of the pressing member urging member until the cam member and the engaging member are engaged in the third positioning portion (until the initial state). Can be done. Thereafter, the remaining sensors are moved toward the opening of the cartridge by the sensor urging member, so that the second sensor can be pressed by the pressing member.

In performing the above-described series of operations, the cam member and the engaging member are moved to the first position by the engagement order defining portion.
Since the engagement of the positioning section, the second positioning section, the third positioning section, and the fourth positioning section is allowed and the engagement is prevented in the reverse order, the above-described operation sequence is reliably achieved. be able to. Therefore, the sensor can be protruded from the main body of the concentration measuring device to the set position for the concentration measurement by moving the pressing member once, and after the concentration measurement, the sensor is used by moving the pressing member forward again. The sensor can be dropped from the concentration measuring device main body. When the pressing force on the pressing member is released, the pressing member can be moved back to the initial state. As a result, the work for setting and taking out the sensor can be remarkably simplified, and the setting state of the sensor can be set accurately, and the occurrence of poor electrical connection and the like can be prevented.

According to a second aspect of the present invention, there is provided a concentration measuring device which employs, as a concentration measuring device body, a rotating member which is vertically rotatable and further has an electrode on a side close to the sensor.
As the sensor, a sensor further including an electrode for external connection at a predetermined position near the rotating member is adopted, and as a cam member,
By rotating the rotating member toward the sensor corresponding to at least the second positioning portion, the electrode of the rotating member and the electrode for external connection of the sensor are electrically connected, and at least the third positioning portion and the third (4) A cam is further provided that includes a cam portion that prevents an electrical connection between an electrode of the rotating member and an electrode for external connection of the sensor by rotating the rotating member in a direction away from the sensor corresponding to the positioning portion. This prevents the contact between the electrode of the rotating member and the electrode for external connection of the sensor when setting and taking out the sensor, greatly reducing the wear on the electrode of the rotating member, and At the time of the concentration measurement, the electrode of the rotating member and the electrode for external connection of the sensor can be surely brought into contact with each other, and the same operation as the first aspect can be achieved.

[0015]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a side view showing an embodiment of a concentration measuring electrode according to the present invention, and FIG. 2 is a transparent side view of a main part. This concentration measuring device has a cartridge 2 for accommodating a large number of flat sensors 1 in a stacked state, and a main body 3 of the concentration measuring device.

The sensor 1 has, for example, a pentagonal shape (a shape obtained by cutting off a corner on one short side of a rectangle having a predetermined length) as shown in FIG. The reference electrode 1b, the counter electrode 1c, the working electrode 1d, the counter electrode 1c, the working electrode 1d, the counter electrode 1
c are formed close to each other, and a reference electrode lead terminal 1b1, a counter electrode lead terminal 1c1, and a working electrode lead terminal 1d are provided at predetermined positions near the rear end.
1. A working electrode lead terminal 1d1 is formed. These lead terminals are formed in this order in the width direction of the thin plate 1a. The reference electrode 1b and the reference electrode lead terminal 1b1 are electrically connected by the reference electrode wiring pattern 1b2, and the space between all the counter electrodes 1c and the counter electrode lead terminal 1c1 is connected by the counter electrode wiring pattern. 1c2, each working electrode 1
d and the corresponding working electrode lead-out terminal 1d1 are electrically connected by a working electrode wiring pattern 1d2. Further, reference electrode 1b, counter electrode 1c, working electrode 1
d, a counter electrode 1c, a working electrode 1d, a counter electrode 1c, and an immobilized enzyme film (not shown) are provided so as to cover the gap therebetween, and a reference electrode wiring pattern 1b
2. A resist layer (not shown) is provided so as to cover the wiring pattern 1c2 for the counter electrode, the wiring pattern 1d2 for the working electrode, and a gap therebetween. However, preferably, a permselective membrane for selectively permeating a reaction product substance or a reaction disappearance substance is provided on the lower surface of the immobilized enzyme membrane.

As shown in FIGS. 4 and 5, the cartridge 2 contains a large number of sensors 1 stacked in a cartridge body 2g, and sends the sensor 1 to a predetermined position at one end. An opening 2b is provided at a position facing the opening 2a to allow a pressing member described later to enter. In the cartridge body 2g, a large number of these sensors 1 are opened.
A coil spring 2c for applying an urging force to move toward the end side where a and 2b are formed, a rod 2d for guiding the coil spring 2c, and a substantially uniform urging force on the lower surface of the sensor 1 when pressed by the coil spring 2c. An urging force transmitting member 2e for transmitting is provided. Reference numeral 2f denotes a cartridge cap detachably attached to the cartridge body 2g, and is formed integrally with the rod-shaped body 2d. Further, a window hole 2h is formed at a predetermined position on the upper side of the cartridge main body 2g, and it is visually confirmed whether the remaining amount of the sensor 1 is equal to or more than a predetermined number through the window hole 2h and a window hole 6b described later. can do.

In the main body 3 of the concentration measuring device, a battery (not shown) serving as a DC power supply is accommodated inside one end of a casing 3a having a substantially rectangular parallelepiped shape, and near the other end. A cartridge accommodating space 3c partitioned from other portions by a partition wall 3d is formed.
The cartridge accommodating space 3c allows the cartridge 2 to be loaded and unloaded when a lid (not shown) provided at the bottom (the lower side in FIGS. 1 and 2) of the casing 3a is opened. Openings 3g and 3h are formed on the outer wall 3f and the partition wall 3d of the cartridge accommodating space 3c to face the openings 2a and 2b of the cartridge 2 when the cartridge 2 is accommodated. And
The contact member housing space 3 is located immediately above the cartridge housing space 3c.
The turning member 3b having four contact members 3j is housed in the contact member housing space 3i so as to be vertically turnable. These four contact members 3j, when the rotating member 3b is rotated downward, the reference electrode lead terminal 1b1, the counter electrode lead terminal 1c1, the working electrode lead terminal 1d1, and the working electrode lead of the sensor 1. The positions thereof are set so as to be in contact with the terminals 1d1 to achieve electrical connection. In addition,
The rotating member 3b is provided at a predetermined position in the center thereof.
b2, which is rotatably supported with respect to the concentration measuring device main body 3, has a protruding shaft member 3b1 which engages with a cam groove 4f to be described later at its base, and has four contact points exposed on the lower surface of the distal end thereof. It has a member 3j. The rotating member 3b is urged to rotate clockwise by an urging member (not shown), for example. Further, a signal processing unit (not shown) for receiving an output signal from the sensor 1 by being electrically connected to the four contact members 3j is provided. The signal processing unit takes in the output signal from the sensor 1 and detects, for example, the maximum value of the differential value of the output signal, and determines the concentration of the substance to be measured based on this maximum value and a preset calibration curve. And outputs the indicated concentration measurement signal.

In the main body 3 of the concentration measuring device, a pressing member 4 for pushing out only the uppermost sensor 1 is provided at a predetermined position between the battery and the cartridge accommodating space 3c so as to be reciprocally slidable. The pressing member 4 integrally has a pressing operation member 4a protruding from the casing 3a and also integrally has a cam member 4b located inside the casing 3a. Further, an urging spring 4c for applying an urging force to move the pressing member 4 in a direction away from the cartridge accommodating space 3c is provided between a predetermined position of the pressing member 4 and a predetermined position of the casing 3a. Further, a lever member 4d which engages with the cam member 4b and regulates the forward and backward movement distances of the pressing member 4 is swingably provided at a predetermined position of the casing 3a. Further, a display unit 6 for displaying a concentration measurement result at a predetermined position on a side surface of the concentration measurement device main body 3.
a, a window hole 6b, and an operation unit (for example, a switch button) 6c for instructing the start of measurement. Here, the window hole 6b faces the window hole 2h.

The cam member 4b has cam grooves 4e and 4f. The cam groove 4e is engaged with a protruding shaft member 4d1 provided at the tip of the lever member 4d, and the cam groove 4f is a rotating member 3.
b is engaged with the protruding shaft member 3b1 provided at the base. The cam groove 4e rotates the lever member 4d downward along with the forward movement of the pressing member 4, and then rotates upward, and the pressing member 4 has a predetermined length shorter than the entire length of the sensor 1 ( A first cam groove portion 4e1 for abutting against the protruding shaft member 4d1 of the lever member 4d in a state in which the lever member 4d has moved forward by a length substantially equal to １ ／ of the total length) to prevent the pressing member 4 from moving forward; 4e
After the forward movement is prevented by the lever 1, the lever member 4d is rotated upward with the return movement of the pressing member 4 by the urging spring 4c, and the pressing member 4 has a predetermined length shorter than the forward moving length. In the state in which the pressing member 4 is moved backward only in a state in which the pressing member 4 is moved backward.
When the pressing member 4 is moved forward again, the lever member 4d is turned upward along with the forward movement of the pressing member 4, and the state where the cam member is turned to the highest position is maintained. In a state where the pressing member 4 continues to move by a predetermined length substantially equal to the entire length of the sensor 1 with reference to the initial position, the pressing member 4 abuts against the protruding shaft member 4d1 of the lever member 4d to prevent the pressing member 4 from moving forward. After the forward movement is prevented by the third cam groove 4e3 and the third cam groove 4e3, the lever member 4 is moved in accordance with the return movement of the pressing member 4 by the biasing spring 4c.
d, while continuing to hold the state of being rotated to the uppermost position, and then rotating downward, and in a state where the pressing member 4 has returned to the initial position, abuts against the protruding shaft member 4d1 of the lever member 4d and presses the pressing member. 4th cam groove part 4e which prevents the return of 4
And 4.

The first cam groove 4e1 to the fourth cam groove 4e4 are continuous in this order.
End of fourth cam groove 4e4 and first cam groove 4e1
Of the pressing member 4 by repeating the
Forward and backward movements can be performed.
Further, the first cam groove 4e1 and the second cam groove 4e
2, the third cam groove 4e3 and the fourth cam groove 4e4
At the end of the passage direction restricting the passage of the protruding shaft member 4d1 in the direction from the first cam groove portion 4e1 to the fourth cam groove portion 4e4, and preventing the passage of the protruding shaft member 4d1 in the pseudo-translation direction. (E.g., a mountain-shaped portion where the downstream side of the passage of the protruding shaft member 4d1 becomes higher) 4e11, 4e21, 4e31, and 4e41 are provided (FIG. 7 is an enlarged view showing a portion surrounded by circles A, B, C, and D in FIG. 7). 8, FIG. 12, FIG. 16, FIG. 20). Therefore, the protruding shaft member 4d1 is connected to the passage direction regulating portions 4f1 and 4f4.
The positions after passing through f2, 4f3, and 4f4 are the first positioning unit, the second positioning unit, the third positioning unit, and the fourth positioning unit, respectively. In the above description, the protruding shaft member 4d1 may be moved relatively to the cam member 4b.

The cam groove 4f is a groove extending substantially parallel to the reciprocating direction of the pressing member 4, and protrudes when the protruding shaft member 4d1 is engaged in the range from the first positioning portion to the second positioning portion. The shape of the entire groove is set such that the bottom surface of the groove in the range that engages with the shaft member 3b1 is higher than the bottom surface of the groove in the other range. The operation of the concentration measuring device having the above configuration is as follows. However, in the following, a case where glucose oxidase is used as an enzyme and a blood glucose level is measured will be described as an example.

First, the lid 3e of the casing 3a is opened to accommodate the cartridge 2 in which a large number of sensors 1 are accommodated in a stacked state in the cartridge accommodating space 3c. To prevent falling off. In this state, since the pressing member 4 is not operated at all, the end (fourth positioning portion) of the fourth cam groove 4e4 of the cam groove 4e is connected to the lever member 4
d is in a state of abutting against the protruding shaft member 4d1 (see FIGS. 6, 7, and 8). In the cam groove 4f, the range in which the bottom surface of the groove is low is the protruding shaft member 3b of the rotating member 3b.
1 and the rotating member 3b rotates clockwise,
One contact member 3j cannot contact the sensor 1 (see FIG. 9).

When measuring the blood sugar level, the pressing member 4 is first moved forward by pressing the pressing operation member 4a. In this case, the cam member 4b also moves forward with the forward movement of the pressing member 4, and the protruding shaft member 4d1 of the lever member 4c is engaged with the first cam groove 4e1, so that the lever member 4d is moved. After rotating downward, it is rotated upward, and finally the terminal end portion (first positioning portion) of the first cam groove portion 4e1 abuts against the protruding shaft member 4d1 of the lever member 4c to press the pressing member 4
To prevent the outbound movement. Of course, when the projecting shaft member 4d1 of the lever member 4c relatively passes through the passage direction restricting portion 4e11, the backward movement of the projecting shaft member 4d1 is prevented. This forward movement of the pressing member 4 causes the distal end of the pressing member 4 to open the opening 3.
h, 2b in this order to enter the interior of the cartridge 2, and press the uppermost (first) sensor 1 to open the cartridge 2.
a and 3g are projected from the casing 3a in this order (see FIGS. 10, 11 and 12). However, the protruding length of the sensor 1 is a predetermined length shorter than the entire length, and the pressing force acts on the portion of the sensor 1 remaining in the cartridge 2 by the coil spring 2c and the urging force transmitting member 2e. Therefore, the natural fall of the sensor 1 is reliably prevented. Of course, the tip of the sensor 1 (reference electrode 1
b, the portion including the counter electrode 1c and the working electrode 1d, and the portion covered with the immobilized enzyme membrane) protrudes from the casing 3a. In the cam groove 4f, the area where the bottom surface of the groove is higher is engaged with the protruding shaft member 3b1 of the rotating member 3b, and the rotating member 3b is rotated in the counterclockwise direction. 3j is a reference electrode lead terminal 1b1 of the sensor 1, a counter electrode lead terminal 1c1,
It comes into contact with the working electrode lead terminal 1d1 and the working electrode lead terminal 1d1 (see FIG. 13). Therefore, when the sensor 1 has finished projecting, the rotating member 3b can be rotated counterclockwise, and the four contact members 3j come into contact with the sensor 1 during the projecting of the sensor 1, causing unnecessary wear. Inconvenience can be prevented from occurring.

Next, when the pressing force is released, the urging spring 4 is released.
The pressing member 4 is moved backward by c. However, the return length in this case is the length of time until the end portion (second positioning portion) of the second cam groove 4e2 abuts against the protruding shaft member 4d1 of the lever member 4c to prevent the pressing member 4 from moving forward. Even if the pressing member 4 moves backward, the tip of the pressing member 4 remains inside the cartridge 2 so that the second sensor 1 is not pushed up (FIGS. 14 and 15). And FIG.
6). Further, since the protruding shaft member 3b1 of the rotating member 3b is still engaged with the range of the cam groove 4f where the bottom surface of the groove is high, the four contact members 3j are connected to the reference electrode lead-out terminals of the sensor 1. 1b1, the lead terminal for counter electrode 1c1, the lead terminal for working electrode 1d1, and the lead terminal for working electrode 1d1 remain in contact (see FIG. 17).

In this state, the reference electrode lead terminal 1b1, the counter electrode lead terminal 1c1, the working electrode lead terminal 1d1, and the working electrode lead terminal 1d1 of the first sensor 1 are each composed of four rotating members 3b. Since it is in contact with the contact member 3j, the blood glucose level can be measured by spotting the blood to be measured on the immobilized enzyme membrane. That is, glucose in blood is oxidized in the presence of glucose oxidase to generate gluconic acid and hydrogen peroxide. Hydrogen peroxide is oxidized because a predetermined bias voltage is applied between the working electrode 1d and the reference electrode 1b, and an electric signal accompanying the oxidation is generated by the working electrode 1d and the counter electrode 1c. Output from Then, by supplying this electric signal to the signal processing unit through the corresponding contact member 3j, a blood glucose level measurement signal can be obtained.

Next, if the pressing member 4 is moved forward again,
Since the pressing member 4 moves forward until the terminal end portion (third positioning portion) of the third cam groove portion 4e3 abuts against the protruding shaft member 4d1 of the lever member 4c, the first sensor 1
Can be almost completely protruded from the casing 3a and fall naturally (see FIGS. 17, 19 and 20). Almost simultaneously with the start of the forward movement of the pressing member 4, the lower part of the cam groove 4f is engaged with the protruding shaft member 3b1 of the rotating member 3b to rotate the rotating member 3b clockwise. And the four contact members 3j cannot come into contact with the sensor 1, so that the first sensor 1 can be protruded without making contact with the four contact members 3j (see FIG. 21). .

After that, it is only necessary to release the pressing force.
By the biasing spring 4c, the terminal end (fourth positioning portion) of the fourth cam groove 4e4 is moved to the projecting shaft member 4d1 of the lever member 4c.
The pressing member 4 is moved backward until the pressing member 4 stops moving forward (see FIGS. 6, 7 and 8). This state is the same as the initial state, and prepares for the next blood sugar level measurement. However, in the cartridge 2, all the remaining sensors 1 are pushed up by the thickness of one sensor by the coil spring 2c and the urging force transmitting member 2e in response to the pressing member 4 being completely removed from the cartridge 2. Further, in the cam groove 4f, the range in which the bottom surface of the groove is lower is engaged with the protruding shaft member 3b1 of the rotating member 3b, so that the four contact members 3j cannot contact the sensor 1. It is kept held (see FIG. 9).

Therefore, by repeating the above operation, the measurement of the blood sugar level can be repeatedly performed. Further, as is apparent from the above description, the operation to be performed by the operator is only the pressing of the pressing member 4 and the release of the pressing force, and there is no need to set or take out the sensor 1 by hand. The operation can be significantly simplified. Further, since the set state of the sensor 1 is always constant, the electrical connection is reliably ensured. further,
Passage direction restricting portions 4e11, 4e21, 4e31, 4e4
1, the state in which the protruding shaft member 4d1 of the lever member 4d relatively moves from the first cam groove 4e1 toward the fourth cam groove 4e4 can be ensured, and the above-described series of operations can be reliably performed. Can be achieved. Furthermore, the four contact members 3 are used only when the concentration is actually measured.
Since the rotating member 3b is rotated so as to bring j into contact with the sensor 1, the four contact members 3j contact the sensor 1 when the sensor 1 is protruded, and wear of the four contact members 3j is minimized. can do.

In the above, the case where the blood glucose level is measured has been described as an example. However, it is needless to say that the present invention can be applied to the measurement of the concentration of a substance to be measured other than glucose and the concentration of the substance to be measured in a solution other than blood. is there. However, in these cases, it is necessary to select a physiologically active substance such as an enzyme according to the substance to be measured.

[0031]

According to the first aspect of the present invention, the sensor can be set and discharged by repeating the pressing of the pressing member and the release of the pressing force in this order. As a result, the operation is significantly simplified. In addition to this, it is possible to achieve a specific effect that a reliable set state of the sensor can be achieved.

According to the second aspect of the present invention, when the sensor is set or taken out, the electrode of the rotating member and the electrode for external connection of the sensor are prevented from coming into contact with each other, and the wear of the electrode of the rotating member is greatly reduced. In addition, the electrode of the rotating member and the electrode for external connection of the sensor can be reliably brought into contact with each other at the time of concentration measurement, and the same effect as that of the first aspect can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view showing one embodiment of a concentration measuring device of the present invention.

FIG. 2 is a perspective side view of an essential part of the above.

FIG. 3 is a plan view of a sensor.

FIG. 4 is a side view of the cartridge.

FIG. 5 is an exploded side view of the cartridge.

FIG. 6 is a perspective view of a main part showing an initial state of an embodiment of the concentration measuring device of the present invention.

FIG. 7 is an enlarged side view showing a relationship between a cam groove and a lever member in an initial state.

FIG. 8 is a sectional view showing a circle A part in FIG. 7;

FIG. 9 is an enlarged side view illustrating a relationship between a cam groove and a rotating member in an initial state.

FIG. 10 is a perspective view of a main part showing a completed state of a sensor projection operation of the concentration measuring device according to one embodiment of the present invention.

FIG. 11 is an enlarged side view illustrating a relationship between a cam groove and a lever member in a state where a sensor projecting operation is completed.

FIG. 12 is a sectional view showing a circle B portion in FIG. 7;

FIG. 13 is an enlarged side view illustrating a relationship between a cam groove and a rotating member in a state where a sensor projecting operation is completed.

FIG. 14 is a perspective view of a main part showing a concentration measurement state of an embodiment of the concentration measurement device of the present invention.

FIG. 15 is an enlarged side view illustrating a relationship between a cam groove and a lever member in a density measurement state.

FIG. 16 is a sectional view showing a circle C portion in FIG. 7;

FIG. 17 is an enlarged side view illustrating a relationship between a cam groove and a rotating member in a density measurement state.

FIG. 18 is a perspective view showing a main part of a concentration measuring device according to an embodiment of the present invention, showing a sensor discharge state.

FIG. 19 is an enlarged side view illustrating a relationship between a cam groove and a lever member in a sensor discharge state.

FIG. 20 is a sectional view showing a circle D part in FIG. 7;

FIG. 21 is an enlarged side view illustrating a relationship between a cam groove and a rotating member in a sensor discharge state.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 sensor 1b1 reference electrode lead terminal 1c1 counter electrode lead terminal 1d1 working electrode lead terminal 2 cartridge 2a, 2b opening 2c coil spring 2e urging force transmitting member 3 concentration measuring device main body 3b rotating member 3j contact member 4 pressing member 4b cam Member 4c Urging spring 4d Lever member 4f Cam groove 4e11, 4e21, 4e31, 4e41 Passing direction regulating portion

Claims (2)

[Claims] 1. A cartridge (2) in which a plurality of sensors (1) for density measurement are stacked and accommodated, and a signal processing unit for outputting a density measurement signal by receiving an output signal from the sensor (1) as an input. The cartridge (2) is detachably mounted on the concentration measuring device main body (3), and the cartridge (2) has the sensor (1) and the cartridge (2). Sensor urging members (2c) and (2e) for applying a pressing force to move them toward the openings (2a) and (2b).
A pressing member (4), wherein the concentration measuring device main body (3) pushes out the sensor (1) located at the opening (2a) (2b) of the cartridge (2) from the concentration measuring device main body (3). A pressing member urging member (4c) for urging the pressing member (4) in a direction opposite to the pushing direction, a cam member (4b), and a pressing member urging member (4c) engaged with the cam member (4b). ), And an engaging member (4d) for controlling a backward movement position of the pressing member (4) by the pressing force and a forward movement position of the pressing member (4) by the pressing force, the cam member (4b) and the engaging member (4d). Is provided integrally with the pressing member (4), and the cam member (4b) determines the position of the first pressing member (4) at the time of pressing the sensor (1) shorter than the entire length thereof. A first positioning unit configured to be pushed out from the concentration measuring device main body (3) by a length; A second positioning portion for setting the return position of the pressing member (4) at the time of releasing the second pressing force so as to prevent the movement of the second sensor (1) by the sensor urging means (2c) (2e); A third positioning portion for setting the position of the second pressing member at the time of pressing so that the sensor (1) is pushed out from the main body of the concentration measuring device (3) by almost the entire length thereof, and the pressing member at the time of releasing the second pressing force Engagement with the cam member (4b) and the fourth positioning portion for setting the return position of (4) to allow the movement of the second sensor (1) by the sensor urging means (2c) (2e). An engagement sequence defining portion that allows the member (4d) to engage in the order of the first positioning portion, the second positioning portion, the third positioning portion, and the fourth positioning portion, and prevents the engagement in the reverse order. (4e11) (4e21) (4e31) (4e41) And a concentration measuring device. 2. The concentration measuring device main body (3) further includes a rotating member (3b) which is vertically rotatable and has an electrode (3j) on a side close to the sensor (1). An electrode for external connection (1b
1) further including (1c1) and (1d1), and the cam member (4
b) rotating the rotating member (3b) toward the sensor (1) at least in correspondence with the second positioning portion, so that the electrode (3j) of the rotating member (3b) and the outside of the sensor (1). The connection electrodes (1b1), (1c1), and (1d1) are electrically connected, and the rotating member (3b) is connected to the sensor (1) at least corresponding to the third positioning portion and the fourth positioning portion.
By rotating in the direction away from the rotating member (3)
The concentration according to claim 1, further comprising a cam portion (4f) for preventing electrical connection between the electrode (3j) of b) and the electrodes (1b1), (1c1), and (1d1) for external connection of the sensor (1). measuring device.