WO2021172056A1

WO2021172056A1 - Brain wave measurement device

Info

Publication number: WO2021172056A1
Application number: PCT/JP2021/005252
Authority: WO
Inventors: 雄眞北添; 拓弥原田; 八木澤　隆; 毅齊藤
Original assignee: 住友ベークライト株式会社
Priority date: 2020-02-26
Filing date: 2021-02-12
Publication date: 2021-09-02
Also published as: JP7028371B2; JPWO2021172056A1

Abstract

A brain wave measurement device (10) is provided with: a fixation frame (20) which is to be mounted on a head (99); a brain wave electrode unit (80) which has an electrode projection part (83) and an electrode member for detecting brain waves and has a columnar brain wave electrode unit body (81) provided with the electrode projection part (83) and the electrode member at one end thereof, and which is attached to the fixation frame (20); and a linear motion mechanism (up-and-down motion ring part (70), threaded brain wave electrode unit body (81), electrode cut surface, restriction surface) for causing the electrode projection part (83) and the electrode member to move linearly without rotation to project by a predetermined length when the brain wave electrode unit (80) is attached to the fixation frame (20).

Description

EEG measuring device

The present invention relates to an electroencephalogram measuring device.

Various developments have been made so far regarding the electroencephalogram measuring device. As a technique of this kind, for example, the technique described in Patent Document 1 is known. The brain wave measurement electrode (brain wave electrode holder) disclosed in Patent Document 1 includes a main body portion arranged around the head, a plurality of support portions attached to the main body portion, and at least a part of the support portions. A brain wave electrode holder provided on the tip side and supported inside the main body portion, the main body portion having a size capable of touching the brain wave electrode through which a finger is inserted. The brain wave electrode has an opening, and the base end side is supported by the support portion, and the flexible portion is flexible and elastically deformed, and the flexible portion is provided on the tip end side of the flexible portion and is provided on the head surface. The flexible portion has an electrode portion to be brought into contact with the electrode portion, and the flexible portion can be deformed until the electrode portion is moved in a direction away from the axis of the support portion. The contact pressure of the above is applied, and the flexible portion also applies the contact pressure with the head surface to the electrode portion moved in a substantially parallel direction along the head surface.

JP-A-2018-94054

Generally, at the time of electroencephalogram measurement, the electroencephalogram measurement electrode is moved up and down in order to bring the electroencephalogram measurement electrode (electroencephalogram electrode holder) of the electroencephalogram measurement device into contact with the scalp and adjust the contact pressure. The electroencephalogram measurement electrode is attached to a predetermined frame with a screw, and the electroencephalogram measurement electrode itself is rotated to move it up and down. At this time, there are problems that the rotation of the electroencephalogram measurement electrode itself causes pain due to hair entanglement in the subject, and that the contact portion with the scalp is displaced, so that the electrode contact state needs to be readjusted. rice field.
The same applies to the technique disclosed in Patent Document 1, in which the position adjusting screw attached to the electrode is rotated by a handle connected to the end thereof, so that the position adjusting screw and the electrode attached to the position adjusting screw are rotated. I'm moving it up and down. Therefore, there are problems such as hair entrainment and readjustment of the electrode contact state with the rotation of the electrode.

The present invention has been made in view of such a situation, and provides a technique for suppressing the entanglement of hair and the readjustment of the electrode contact state that occur due to the position adjustment of the electroencephalogram measuring electrode in the electroencephalogram measuring device. The purpose is.

According to the present invention
The frame attached to the head and
An electroencephalogram electrode unit having an electrode portion for detecting an electroencephalogram and a pillar-shaped electroencephalogram electrode unit main body provided with the electrode portion at one end, and attached to the frame.
Provided is an electroencephalogram measuring device having a linear motion mechanism that linearly moves the electrode portion without rotation to project a predetermined length when the electroencephalogram electrode unit is attached to the frame.

According to the present invention, it is possible to provide a technique for suppressing the entanglement of hair and the readjustment of the electrode contact state that occur with the position adjustment of the electrode for electroencephalogram measurement in the electroencephalogram measuring device.

It is a figure which shows typically the electroencephalogram measuring apparatus in the state which is attached to the human head which concerns on 1st Embodiment. It is a front view of the electroencephalogram electrode unit which concerns on 1st Embodiment. It is a top view of the electroencephalogram electrode unit which concerns on 1st Embodiment. It is a perspective view of the fixing frame to which the electrode holding part was attached which concerns on 1st Embodiment. It is a figure which shows the electrode holding part which concerns on 1st Embodiment. It is a top view of the electrode holding part which concerns on 1st Embodiment. It is sectional drawing of the electroencephalogram electrode unit main body which concerns on another example of 1st Embodiment. It is a figure which shows the electrode insertion hole of the electrode holding part which concerns on another example of 1st Embodiment. FIG. 5 is a perspective view showing a first state in which an electroencephalogram electrode unit to which a vertical movement ring portion is attached is inserted into an electrode holding portion according to the first embodiment. FIG. 5 is a perspective view showing a second state in which the electroencephalogram electrode unit to which the vertical movement ring portion is attached is inserted into the electrode holding portion according to the first embodiment. It is a figure explaining the transition of the fixed state of the electrode holding part and the fixing frame which concerns on 1st Embodiment. It is a figure which shows typically the linear motion mechanism of the electroencephalogram electrode unit which concerns on 2nd Embodiment. It is a figure which shows typically the structure of the knock type operation mechanism which concerns on 2nd Embodiment. It is a figure explaining the schematic operation of the knock type maneuvering mechanism which concerns on 3rd Embodiment. It is a figure explaining the schematic operation of the knock type maneuvering mechanism which concerns on 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings to be referred to, for the sake of convenience, the vertical / forward / backward / horizontal directions indicated by the arrows will be described.

<First Embodiment>
FIG. 1 is a diagram schematically showing an electroencephalogram measuring device 10 worn on a human head 99.
The electroencephalogram measuring device 10 is attached to a human head 99, detects an electroencephalogram as a potential fluctuation from a living body, and outputs the detected electroencephalogram to a brain wave display device (not shown). The electroencephalogram display device acquires the electroencephalogram detected by the electroencephalogram measuring device 10, displays it on a monitor, saves data, and performs well-known electroencephalogram analysis processing.

<Structure of EEG measuring device 10>
As shown in FIG. 1, the electroencephalogram measuring device 10 has a plurality of electroencephalogram electrode units 80, a fixing frame 20, and an electrode holding portion 40 for attaching the electroencephalogram electrode unit 80 to the fixing frame 20. The electroencephalogram electrode unit 80 is attached to the electrode holding portion 40 and then attached to the fixing frame 20.

In the present embodiment, the electroencephalogram electrode units 80 are provided for 5 channels (5), and the electrode holding portions 40 are also provided accordingly. The position of 5ch (that is, the mounting position of the electroencephalogram electrode unit 80) corresponds to, for example, the positions of T3, C3, Cz, C4, and T4 in the international 10-20 electrode arrangement method.

The electroencephalogram electrode unit 80 has a substantially columnar electroencephalogram electrode unit main body 81 (body portion) and an electrode protrusion 83 provided on one end side thereof. An electrode member is provided on the electrode protrusion 83, and the electrode member comes into contact with the scalp of the head 99 to acquire an electroencephalogram.

Further, as will be described in detail later, an electrode cut surface 82 is formed on the side surface of the electroencephalogram electrode unit main body 81, and rotation is caused by the regulation surface 49a (see FIG. 6 and the like described later) of the electrode insertion hole 49 of the electrode holding portion 40. By rotating the vertically moving ring portion 70 that is regulated and screw-fitted with the electroencephalogram electrode unit main body 81, it moves linearly up and down without rotation.

FIG. 2 shows a front view of the electroencephalogram electrode unit 80. FIG. 3 shows a plan view of the electroencephalogram electrode unit 80. The electroencephalogram electrode unit 80 has a substantially columnar electroencephalogram electrode unit main body 81 (body portion) and an electrode protrusion 83 provided on one end side (lower side in the drawing) thereof. Further, at the other end (upper side in the drawing) of the electroencephalogram electrode unit main body 81, a signal extraction unit 85 for taking out the signal of the electrode protrusion 83 is integrally provided.

The electrode protrusion 83 is provided with a conductive electrode member in a structure of, for example, a rubber-like elastic body (silicone rubber or the like) having a predetermined shape, and a signal (brain wave) detected by the electrode member is transmitted from a signal extraction unit 85 by a signal line. It is designed to be taken out.

The predetermined shape of the rubber-like elastic body exhibited by the electrode protrusion 83 is, for example, a shape in which a plurality of protrusions extend in an annular shape from a columnar base. A conductive electrode member is provided on the protrusion. The electrode protrusion 83 is fixed to the electroencephalogram electrode unit main body 81 (body portion) so as not to rotate.

The side surface portion of the electroencephalogram electrode unit main body 81 is screwed, and is screw-fitted with the vertical movement ring portion 70 described later. Further, two electrode cut surfaces 82 cut out on a vertical surface are formed at positions facing each other on the electroencephalogram electrode unit main body 81. That is, it has a shape (also referred to as an I-cut shape) having a D-cut on two opposite surfaces in a cross-sectional view.

<Structure of fixing frame 20 and electrode holding portion 40>
FIG. 4 shows a perspective view of the fixing frame 20 to which the electrode holding portion 40 is attached. The fixing frame 20 and the electrode holding portion 40 are made of a hard member such as a polyamide resin, but the purpose is not limited to these materials, they do not affect brain wave detection, and are suitable for wearability and workability. Any material will do. Further, different materials may be used for the fixing frame 20 and the electrode holding portion 40.

<Structure of fixing frame 20>
The fixing frame 20 has a pair (two) of rails 21 arranged in parallel, and a rail fastening portion 23 for connecting the rails 21 so as to pass each other at a plurality of places.

As shown in the figure, the pair of rails 21 are curved along the head 99. Further, the space surrounded by the pair of rails 21 and the rail fastening portion 23 is a movable region 29 in which the electrode holding portion 40 can move. That is, the movable region 29 is provided in a range in which the electrode holding portion 40 (electroencephalogram electrode unit 80) is arranged and moves within a certain range. In other words, the rail fastening portion 23 is provided at a position that does not hinder the movement of the electrode holding portion 40. In the present embodiment, the movable regions 29 are provided at five locations corresponding to each of the five electrode holding portions 40 (electroencephalogram electrode unit 80).

<Structure of fixing frame 40>
The structure of the electrode holding portion 40 will be described with reference to FIGS. 5 and 6. 5A and 5B are views showing the electrode holding portion 40, FIG. 5A is a perspective view, and FIG. 5B is a side view. FIG. 6 is a plan view of the electrode holding portion 40.

The electrode holding portion 40 includes a rectangular first connecting surface 41 which is substantially plate-shaped and long in the front-rear direction, and an arm-shaped connecting portion 50 extending downward at each of the front-rear end portions of the first connecting surface 41. Has. An electrode insertion hole 49 through which the electroencephalogram electrode unit 80 can be inserted is provided in the center of the first connecting surface 41.

Specifically, the connecting portion 50 is predetermined from the second connecting surface 42 extending downward from each of the front and rear ends of the first connecting surface 41 and inward from the lower end of the second connecting surface 42. It has a third connecting surface 43 that extends in the direction. Here, the inward direction means the direction of the end portions on the opposite sides of the front and rear, and specifically, the third connecting surface 43 extending from the second connecting surface 42 on the front side has a predetermined length on the rear side. Only postpone. The third connecting surface 43 extending from the second connecting surface 42 on the rear side extends to the front side by a predetermined length. At this time, the distance between the extending ends of the front and rear connecting surfaces 42 is such that they do not interfere with each other when the electroencephalogram electrode unit 80 is attached to the electrode insertion hole 49.

Further, at the end extending inward of the third connecting surface 43, a regulation surface 44 extending further upward by a predetermined length is provided. The extending end portion (upper end portion) of the regulation surface 44 does not hit the inner wall surface of the first connecting surface 41 and has a certain distance from the inner wall surface.

The space surrounded by the first connecting surface 41, the second connecting surface 42, the third connecting surface 43, and the regulating surface 44 is called a cotangent space 48. When the electrode holding portion 40 is attached to the rail 21, the rail 21 is accommodated in the extra space 48 (see FIGS. 4 and 11). The distance between the upper end of the regulation surface 44 and the inner wall surface of the first connecting surface 41 is used when the electrode holding portion 40 is attached to the rail 21.

An electrode insertion hole 49 penetrating in the thickness direction is provided in the center of the first connecting surface 41. The electrode insertion hole 49 has a shape corresponding to the electrode cut surface 82 (I-cut shape) of the electroencephalogram electrode unit 80 described above. That is, in the electrode insertion hole 49, two regulation surfaces 49a are formed at opposite positions in the circular through hole. The position of the regulation surface 49a is not particularly limited, but in the present embodiment, it is formed on the front and rear sides of the electrode insertion hole 49. With such a shape of the electrode insertion hole 49, the electroencephalogram electrode unit 80 can move up and down freely when inserted into the electrode insertion hole 49, but the fitting structure of the electrode cut surface 82 and the electrode insertion hole 49 Cannot rotate due to. That is, the electroencephalogram electrode unit 80 moves linearly up and down without rotation. In the following, the fitting structure in which the electroencephalogram electrode unit 80 is moved up and down without rotation as described above will be referred to as a rotation-regulated fitting structure for convenience.

7 and 8 show another example of the rotation-controlled fitting structure shown in FIGS. 3 and 6 above. FIG. 7 is a cross-sectional view of the electroencephalogram electrode unit main body 81A of another example, and FIG. 8 shows an electrode insertion hole 49A of the electrode holding portion 40A. As shown in the figure, the electroencephalogram electrode unit main body 81A of the electroencephalogram electrode unit 80 is provided with a recess 88 instead of the electrode cut surface 82. Further, the electrode insertion hole 49A is formed with a convex portion 47 protruding from the edge of the through hole toward the center of the circle by a predetermined length. By fitting the concave portion 88 and the convex portion 47, the electroencephalogram electrode unit main body 81 (body portion) cannot rotate, but can move freely up and down.

<Structure and function of ring portion 70 for vertical movement>
9 and 10 show a state in which the electroencephalogram electrode unit 80 to which the vertical movement ring portion 70 is attached is inserted into the electrode holding portion 40. The operation of the electroencephalogram electrode unit 80 rotating linearly without rotation will be described with the state of FIG. 9 as the first state and the state of FIG. 10 as the second state.

The vertical movement ring portion 70 is formed in a ring shape with a predetermined thickness, and the circular ring inner peripheral surface 71 is screwed. The ring inner peripheral surface 71 of the vertical movement ring portion 70 is screw-fitted with a screw formed on the side surface of the electroencephalogram electrode unit main body 81. Unlike the electrode insertion hole 49 of the electrode holding portion 40, the ring inner peripheral surface 71 is not formed with a regulation surface or the like, and the vertical movement ring portion 70 screwed into the electroencephalogram electrode unit 80 rotates. It is free.

When the electroencephalogram electrode unit 80 to which the vertical movement ring portion 70 is screw-fitted is inserted into the electrode holding portion 40 (electrode insertion hole 49), the bottom surface of the vertical movement ring portion 70 comes into contact with the first connecting surface 41. Unless the vertical movement ring portion 70 is operated, the electroencephalogram electrode unit 80 is not inserted any more, that is, it cannot move in the vertical direction with respect to the electrode holding portion 40.

Here, when the vertical movement ring portion 70 is rotated in a predetermined direction while being in contact with the first connecting surface 41 with respect to the electroencephalogram electrode unit 80 in the first state of FIG. 9, the above-mentioned fitting structure and the screw Due to the meshing structure, the electroencephalogram electrode unit 80 does not rotate but moves linearly downward, and is in the second state of FIG. On the contrary, when the vertical movement ring portion 70 is rotated in the opposite direction to the above in the second state of FIG. 10, the electroencephalogram electrode unit 80 does not rotate but moves linearly upward, and the first state of FIG. 9 become.

<Transition of the fixed state of the electrode holding portion 40 and the fixing frame 20>
FIG. 11 is a diagram for explaining the transition of the fixed state of the electrode holding portion 40 and the fixing frame 20. Here, it will be described in relation to the non-rotating linear motion of the electroencephalogram electrode unit 80 shown in FIGS. 9 and 10.

FIG. 11A shows a state in which the electrode holding portion 40 to which the electroencephalogram electrode unit 80 is attached is arranged on the fixing frame 20 (rail 21). In this state, the rail 21 and the electrode holding portion 40 are not fixed, and the electrode holding portion 40 can move vertically and horizontally with respect to the rail 21 and in the extending direction of the rail 21.

In FIG. 11B, the vertical movement ring portion 70 is rotated in a predetermined direction to move the electroencephalogram electrode unit 80 directly downward (head 99 side), the electrode protrusion 83 is in contact with the head 99, and the electroencephalogram electrode unit 80 is in contact with the head 99. , The rail 21 is in contact with the contact surface 45 of the connecting portion 50.

When the vertical movement ring portion 70 is further rotated from this state to directly move the electroencephalogram electrode unit 80 downward, the fixed state between the rail 21 and the contact surface 45 becomes stronger. Further, the tip of the electrode protrusion 83 in contact with the head 99 is bent, and the force with which the electrode protrusion 83 is pressed against the scalp becomes stronger. That is, as the pressure contact state between the electrode protrusion 83 of the electroencephalogram electrode unit 80 and the scalp (head 99) becomes stronger, the electrode holding portion 40 (contact surface 45 of the connecting portion 50) and the rail 21 are strongly fixed. Become. On the contrary, when it is desired to loosen the pressure contact state, the electroencephalogram electrode unit 80 is changed from the state of FIG. 11 (b) to the state of FIG. 11 (a) by rotating the vertical movement ring portion 70 in the direction opposite to the above rotation direction. ..

As described above, the electrode holding portion 40 has a fixed structure in which two parallel rails 21 are fixed by the two connecting portions 50. In this fixed structure, the electroencephalogram electrode unit 80 is irrotably linearly moved up and down with respect to the electrode holding portion 40 by the ball screw mechanism, and the fixing strength is adjusted by the amount of the linear motion. That is, with the linear movement of the electroencephalogram electrode unit 80 due to the rotation of the vertical movement ring portion 70, the two connecting portions 50 provided in the electrode holding portion 40 are pressed against the two parallel rails 21. As a result, the attachment operation of the electroencephalogram electrode unit 80 (position adjustment operation in the vertical direction) and the fixing operation of the rail 21 and the electrode holding portion 40 (connecting portion 50) proceed at the same time. That is, as the electroencephalogram electrode unit 80 is moved linearly and the pressure contact state (electrode contact state) with the pushing head 99 becomes stronger, the fixed state of the rail 21 and the electrode holding portion 40 also becomes stronger.

This mounting operation and fixing operation are performed independently by the respective electrode holding portions 40. Therefore, the attachment work and the position adjustment work of a certain electroencephalogram electrode unit 80 do not affect the attachment state of another electroencephalogram electrode unit 80. Further, since the electroencephalogram electrode unit 80 moves linearly, a state in which hair is caught by rotation occurs, and a state in which hair is caught between the rail 21 and the electrode holding portion 40 can be suppressed.

Further, in a state where the electroencephalogram electrode unit 80 is not fixed to the electrode holding portion 40, a cotangent space 48 capable of adjusting the relative position between the connecting portion 50 and the rail 21 is provided. As a result, the following functions and effects can be realized.

That is, within the range of this extra space 48, the position of the connecting portion 50 can be adjusted relative to the rail 21 up, down, front, back, left and right. This does not affect the fixed state of the other electrode holding portions 40. Further, the extra space 48 makes it possible to adjust the relative position of the connecting portion 50 and the rail 21 in the extending direction (extending direction). That is, the position of the electroencephalogram electrode unit 80 can be adjusted in the left-right direction within the range in which the movable region 29 is formed. Further, the cotangent space 48 allows the connecting portion 50 and the rail 21 to adjust the positions of the two rails 21 in the passing direction. That is, the position of the electrode holding portion 40 can be adjusted in the width direction of the rail 21 (front-back direction in the drawing). Further, the position of the connecting portion 50 and the rail 21 in the distance direction between the rail 21 and the head 99 can be adjusted by the extra space 48. That is, the electrode holding portion 40 (connecting portion 50) can move up and down within the range of the cotangent space 48.

The fixing of each electrode holding portion 40 and the electrode portion (electroencephalogram electrode unit 80) is independent of the fixing of the other electrode holding portion 40 and the electrode portion (electroencephalogram electrode unit 80). Therefore, when adjusting the fixing position of a certain electroencephalogram electrode unit 80, the fixing work between the other electrode holding portion 40 and the electrode portion (electroencephalogram electrode unit 80) is not affected.

Regarding the electroencephalogram electrode unit 80 whose fixed state and detection level have been adjusted, if the fixed state is changed, it may be necessary to adjust the detection level and the like again. That is, if the adjustment of the fixed state of one electroencephalogram electrode unit 80 affects the fixed state of another electroencephalogram electrode unit 80, the above adjustment work is required, and it takes time to detect the electroencephalogram. However, in the electroencephalogram measuring device 10 of the present embodiment, such useless work can be avoided.

<Features / Functions of EEG Measuring Device 10>
The features and functions of the electroencephalogram measuring device 10 of the present embodiment are summarized as follows.
(1) The electroencephalogram measuring device 10 is
The frame (fixing frame 20) attached to the head 99 and
It has an electrode portion (electrode protrusion 83 and electrode member) for detecting brain waves, and a pillar-shaped brain wave electrode unit main body 81 (body portion) provided with the electrode portion (electrode protrusion 83 and electrode member) at one end. An electroencephalogram electrode unit 80 attached to the frame (fixing frame 20),
When the electroencephalogram electrode unit 80 is attached to the frame (fixing frame 20), the electrode portion (electrode protrusion 83 and electrode member) is linearly moved without rotation to project a predetermined length (for vertical movement). It has a ring portion 70, a screwed electroencephalogram electrode unit main body 81, an electrode cut surface 82, and a regulation surface 49a).
When the electrode portion (electrode protrusion 83) is brought into contact with the head, the position of the electroencephalogram electrode unit 80 can be adjusted by rotating the electroencephalogram electrode unit 80 without rotating it. It is possible to avoid entanglement of hair and readjustment of electrode contact state as was done.

(2) The electrode portion (electrode projection portion 83) is non-rotatably fixed to the electroencephalogram electrode unit main body 81.
Therefore, as long as the vertical movement ring portion 70 is not moved, the electrode contact state with the head 99 (scalp) does not change, and the electroencephalogram detection can be stabilized.

(3) The fixing mechanism (vertical movement ring portion 70, screwed electroencephalogram electrode unit body 81, electrode cut surface 82, regulation surface 49a) is a ball screw mechanism, and the amount of protrusion of the electrode portion (electrode protrusion 83) is large. Has an adjustment function.
That is, the rotation regulation fitting structure is realized by the ball screw mechanism. Since the protrusion amount of the electrode portion (electrode protrusion 83) is adjusted by the ball screw mechanism, it can be adjusted steplessly, and the adjustment amount (change amount) becomes one pitch of the screw with one rotation of the vertical movement ring portion 70. , Fine adjustment is possible.
In the ball screw mechanism, the rotation-restricted fitting structure of the electroencephalogram electrode unit 80 may be provided in a configuration different from that of the electroencephalogram electrode unit main body 81 and the electrode insertion hole 49.

(4) The ball screw mechanism is
A screw portion formed on the peripheral surface of the electroencephalogram electrode unit main body 81, a ring portion rotatably screwed to the screw portion (vertical movement ring portion 70), and
Consists of
The electroencephalogram electrode unit main body 81 is restricted from being non-rotatable in a state of being attached to the frame (fixing frame 20 (electrode holding portion 40)).
By rotating the ring portion (vertical movement ring portion 70) at a position where the position with respect to the frame (fixing frame 20 (electrode holding portion 40)) does not change, the above-mentioned fitting structure and screw meshing structure can be obtained. The electroencephalogram electrode unit 80 does not rotate but moves linearly up and down.
By configuring the ball screw mechanism with the electroencephalogram electrode unit 80, the electrode holding portion 40, and the vertical movement ring portion 70, the number of components can be reduced and the linear motion function can be realized with a simple configuration.

(5) The electroencephalogram measuring device 10 includes a plurality of electrode holding portions 40 to which the electroencephalogram electrode unit 80 is attached, and
It has a pair of rails 21 provided in parallel and a fixing frame 20 mounted on the head 99.
The electrode holding portion 40 has a connecting portion 50 that connects to each of the rails 21.
In the state where the electroencephalogram electrode unit 80 is not attached, the connecting portion 50 and the rail 21 are not fixed, and the electroencephalogram electrode unit 80 is attached so that the electroencephalogram electrode unit 80 and the scalp (head 99) are in a pressure contact state. As the strength increases, the fixation between the electrode holding portion 40 and the rail 21 becomes stronger.
As described above, the electrode holding portion 40 has a fixing structure in which two parallel rails 21 are fixed by the two connecting portions 50. In this fixed structure, the electroencephalogram electrode unit 80 is irrotably linearly moved with respect to the electrode holding portion 40 by the linear motion mechanism realized by the ball screw mechanism, and the fixing strength is adjusted by the amount of the linear motion. That is, with the linear movement of the electroencephalogram electrode unit 80 due to the rotation of the vertical movement ring portion 70, the two connecting portions 50 provided in the electrode holding portion 40 are pressed against the two parallel rails 21. As a result, the attachment operation of the electroencephalogram electrode unit 80 (position adjustment operation in the vertical direction) and the fixing operation of the rail 21 and the electrode holding portion 40 (connecting portion 50) proceed at the same time. That is, as the electroencephalogram electrode unit 80 is moved linearly and the pressure contact state (electrode contact state) with the pushing head 99 becomes stronger, the fixed state of the rail 21 and the electrode holding portion 40 also becomes stronger. The mounting operation and the fixing operation are performed independently by the respective electrode holding portions 40. Therefore, the attachment work and the position adjustment work of a certain electroencephalogram electrode unit 80 do not affect the attachment state of another electroencephalogram electrode unit 80. Further, since the electroencephalogram electrode unit 80 moves linearly, it is possible to avoid a state in which the hair is caught by the rotation and the hair is caught between the rail 21 and the electrode holding portion 40.

(6) The electroencephalogram electrode unit 80 does not have an elastic member between the electroencephalogram electrode unit main body 81 and the electrode protrusion 83.
That is, if there is an elastic member such as a spring in the vicinity of the electrode protrusion 83, the vertical movement of the electrode protrusion 83 may shift. As a result, the pressure contact state (electrode contact state) may easily change. However, in this embodiment, there is no such risk.

The electroencephalogram electrode unit 80 is attached to the fixing frame 20 via the electrode holding portion 40, but even if the electrode holding portion 40 is omitted and the electroencephalogram electrode unit 80 is directly attached to the fixing frame 20 and directly moves up and down. good.

<Second embodiment>
FIG. 12 is a diagram schematically showing a linear motion mechanism of the electroencephalogram electrode unit 180 according to the second embodiment. The configuration of the electroencephalogram electrode unit 180 other than the linear motion mechanism is the same as that of the first embodiment, and the linear motion mechanism of the electroencephalogram electrode unit 180 will be mainly described below.

When the electroencephalogram electrode unit main body 181 of the electroencephalogram electrode unit 180 is inserted into the electrode insertion hole 149 of the electrode holding portion 140, it linearly moves up and down without rotation due to the same rotation regulation fitting structure as in the first embodiment. can do.

As shown in FIG. 12A, the lower opening portion of the electrode insertion hole 149 has a smaller diameter than that of the upper side, and a space 148 for arranging the coil spring 175 is formed. With the rod 182 extending from the bottom surface of the electroencephalogram electrode unit main body 181 and the electroencephalogram electrode unit 180 inserted into the electrode insertion hole 149, the rod 182 is inserted into the coil spring 175 and extends downward to the electrode insertion hole 149. It protrudes from the lower opening. An electrode protrusion 183 is attached to the lower end of the rod 182.

A plurality of fixing recesses 185 (here, three locations) are formed side by side on the side surface of the electroencephalogram electrode unit main body 181. The electrode holding portion 140 is formed with a pin hole 147 penetrating the space 148 inside the electrode insertion hole 149.

As shown in FIG. 12B, when the electroencephalogram electrode unit 180 is pushed in, the electrode protrusion 183 moves linearly downward according to the amount of pushing. At this time, the coil spring 175 is compressed to urge the electroencephalogram electrode unit main body 181 upward. That is, the electrode protrusion 183 of the electroencephalogram electrode unit 180 protrudes toward the head 99 side by an amount corresponding to the amount pushed against the coil spring 175.

As shown in FIG. 12 (c), the electroencephalogram electrode unit 180 is fixed by inserting the fixing pin 170 into the pin hole 147 from the outside and locking the tip of the fixing pin 170 in the desired recess 185. In the example of FIG. 12 (c), the fixing pin 170 is locked in the uppermost recess 185. That is, the protrusion amount of the electrode protrusion 183 is the largest.

As described above, the linear motion mechanism of the electroencephalogram electrode unit 180 has the coil spring 175 and the fixing pin 170 (stopper), and the electroencephalogram electrode unit 180 is projected against the coil spring 175 to form the fixing pin 170 (stopper). It is fixed by a stopper). With such a configuration, the work of adjusting the protrusion amount of the electrode protrusion 183 can be simplified.

<Third embodiment>
In the present embodiment, the linear motion mechanism of the electrode protrusion 283 of the electroencephalogram electrode unit 280 is realized by a cam mechanism. As the cam mechanism, a simple swash plate cam or an end face cam can be used, but the one to which the technology of the knock type maneuvering mechanism is applied will be described below.

FIG. 13 (a) schematically shows the configuration of the knock-type manipulating mechanism 201, and FIG. 13 (b) shows the configuration of the knock-type manipulating mechanism 201 in an exploded manner.

The electroencephalogram electrode unit 280 is housed inside the barrel 202, and is configured to be knockable in the downward (head side) direction. The shaft cylinder 202 may be integrally configured with the electrode holding portion 240 (electrode insertion hole 249). The electroencephalogram electrode unit 280 is provided with an electrode protrusion 283 at the lower end portion, and is urged upward by a coil spring 275.

A substantially tubular rotor 208 is provided on the upper end surface of the electroencephalogram electrode unit 280. The rotation of the electroencephalogram electrode unit 280 is restricted by the same rotation-regulated fitting structure as in the first embodiment. At this time, the rotor 208 is in contact with the upper end surface of the electroencephalogram electrode unit 280, but the contact surface (contact surface) is not fixed and slides, even when the electroencephalogram electrode unit 280 does not rotate. The rotor 208 can rotate.

A tubular knock member 210 (knock body) is provided on the upper side of the rotor 208. The knock member 210 is provided with an annular first cam portion 210a at the lower end portion and an operation convex portion 211 for performing a pressing operation at the upper end portion. The first cam portion 210a has a shape in which a triangular shape with the top facing downward is continuous in an annular shape.

A middle piece portion 209 is provided on the inner peripheral surface of the shaft cylinder 202. The middle piece portion 209 has a plurality of guide grooves 209a and a second cam portion 209b. The second cam portion 209b is provided at the lower end portion of the guide groove 209a, and is formed between the guide grooves 209a by two inclined portions 209b2 and 209b4 and a straight portion 209b3 connecting them.

Three locking claws 208a are provided on the outer peripheral surface of the rotor 208 every 120 degrees in the circumferential direction so that the guide groove 209a can be slidable. Here, one locking claw portion 208a is shown.

In this way, the knock member 210 (first cam portion 210a, operation convex portion 211), middle piece portion 209 (guide groove 209a, second cam portion 209b), and rotor 208 (locking claw portion 208a) are used for knock-type operation. The ejection mechanism 201 is formed. By pressing the operating convex portion 211 of the knock member 210 with the knock-type manipulating mechanism 201 and the coil spring 275, the electrode protruding portion 283 of the electroencephalogram electrode unit 280 is projected / retracted with respect to the head of the subject. , Switch between contact state and non-contact state.

14 and 15 are diagrams for explaining the schematic operation of the knock-type manipulating mechanism 201, and in particular, the cam mechanism is enlarged and shown.

In FIG. 14A, the locking claw portion 208a is guided by the guide groove 209a and is engaged with the first cam portion 210a. Since the electroencephalogram electrode unit 280 is urged upward by the coil spring 275, the rotor 208 in contact with the electroencephalogram electrode unit 280 is also urged upward. Therefore, the knock member 210 having the first cam portion 210a that engages with the locking claw portion 208a is also urged upward.

By pressing the knock member 210, the knock member 210, the rotor 208, and the electroencephalogram electrode unit 280 project downward (head side).

As shown in FIG. 14B, when the locking claw portion 208a is disengaged from the guide of the guide groove 209a, the restriction on the rotation direction of the rotor 208 is released, and the locking claw portion 208a is on the slope of the first cam portion 210a. As shown in FIG. 14 (c), it moves to the locking portion 210a1. At this time, the rotor 208 rotates, but the electroencephalogram electrode unit 280 does not rotate due to the rotation regulation fitting structure and moves linearly.

Then, when the pressing of the knock member 210 is released, the locking claw portion 208a (rotor 208) is urged upward by the urging force of the coil spring 275. As a result, as shown in FIG. 15A, the locking claw portion 208a abuts on the inclined portion 209b2 of the second cam portion 209b and is further guided by the inclined portion 209b2, and is engaged as shown in FIG. 15B. It is locked to the stop portion 209b1. That is, the electrode protrusion 283 of the electroencephalogram electrode unit 280 is in a state of being directly moved and pressed against the head 99.

When retracting the electrode protrusion 283 of the electroencephalogram electrode unit 280, the knock member 210 is pressed again to engage the first cam portion 210a and the locking claw portion 208a, and the locking claw portion 208a is locked. Separate from 209b1. Then, the locking claw portion 208a is guided by the urging force of the coil spring 275 to the inclined portion 209b4 of the second cam portion 209b, and is guided by sliding into the guide groove 209a again. As a result, the electroencephalogram electrode unit 280 (electrode protrusion 283) retracts. At this time, the rotor 208 rotates, but the electroencephalogram electrode unit 280 does not rotate due to the rotation regulation fitting structure and moves linearly.

In the electroencephalogram measuring device of the present embodiment, as described above, the cam mechanism (knock type manipulating mechanism 201) is
Axial cylinder 202 and
A coil spring 275 that urges the electroencephalogram electrode unit 280 housed inside the barrel 202 in a direction opposite to the protruding direction (lower direction) (upper direction).
A middle piece portion 209 (second cam portion 209b) having a guide groove 209a (cam groove) provided on the inner peripheral surface of the shaft cylinder 202,
A knock member 210 having a first cam portion 210a (cam tooth) having an uneven shape (triangular shape) at the tip, which is slidably arranged in the forward / backward direction along the guide groove 209a (cam groove).
A rotor 208 (rotary cam) having a locking claw portion 208a (cam tooth receiver) that meshes with the first cam portion 210a, and
It is configured to have.
By introducing the rotation-restricted fitting structure and the cam mechanism as described above together, the electroencephalogram electrode unit 280 can be easily projected and retracted by a linear motion by a pressing operation. Therefore, it is possible to prevent the electroencephalogram electrode unit 280 from rotating during protrusion / retreat, causing hair or the like to be caught in the electroencephalogram electrode unit, or the electrode contact state to be in a state requiring readjustment.

Although the embodiments of the present invention have been described above with reference to the drawings, these are examples of the present invention, and various configurations (modifications) other than the above can be adopted.

This application claims priority on the basis of Japanese Application Japanese Patent Application No. 2020-030157 filed on February 26, 2020, and incorporates all of its disclosures herein.

10 Electroencephalogram measuring device 20 Fixing frame 21 Rail 23 Rail fastening part 29

Movable area

40, 40A, 140 Electrode holding part 41 First connecting surface 42 Second connecting surface 43 Third connecting surface 44 Restricting surface 45 Contact surface 47 Convex part 48

Extra space

49, 49A Electrode insertion hole 49a Control surface 50 Connecting part 70 Vertical movement ring part 71 Ring inner

peripheral surface

80, 180, 280 Brain

wave electrode unit

81, 81A, 181 Brain wave electrode unit body 82

Electrode cut surface

83 , 183, 283 Electrode protrusion 85 Signal extraction part 88 Recess 99 Head 147 Pin hole 148 Space 149 Electrode insertion hole 170

Fixing pin

175, 275 Coil spring 182 Rod 185 Recess 201 Knock type feeding mechanism 202 Shaft cylinder 208 Rotator 208a Locking claw part 209 Middle piece part 209a Guide groove 209b2, 209b4 Inclined part 209b3 Straight part 209b Second cam part 209b1 Locking part 210 Knock member 210a First cam part 210a1 Locking part 211 Operation convex part 240 Electrode holding part 249 Electrode Insertion hole

Claims

The frame attached to the head and
An electroencephalogram electrode unit having an electrode portion for detecting an electroencephalogram and a pillar-shaped electroencephalogram electrode unit main body provided with the electrode portion at one end, and attached to the frame.
When the electroencephalogram electrode unit is attached to the frame, the electrode portion is linearly moved without rotation to project a predetermined length, and a linear motion mechanism.
An electroencephalogram measuring device having.
The electroencephalogram measuring device according to claim 1, wherein the electrode portion is non-rotatably fixed to the electroencephalogram electrode unit main body.
The electroencephalogram measuring device according to claim 1 or 2, wherein the linear motion mechanism is a ball screw mechanism and has a function of adjusting the amount of protrusion of the electrode portion.
The ball screw mechanism
The threaded portion formed on the peripheral surface of the electroencephalogram electrode unit body and
A ring portion rotatably screwed to the threaded portion and
Consists of
The main body of the electroencephalogram electrode unit is restricted from being non-rotatable when attached to the frame.
By rotating the ring portion at a position where the position with respect to the frame does not change, the electroencephalogram electrode unit main body is directly moved without being rotated.
The electroencephalogram measuring device according to claim 3.
The linear motion mechanism has a spring and a stopper, and has a spring and a stopper.
The electroencephalogram measuring device according to claim 1 or 2, wherein the electroencephalogram electrode unit projects against the spring and is fixed by the stopper.
The linear motion mechanism is a cam mechanism.
The electroencephalogram measuring device according to claim 1 or 2.
The cam mechanism
Axial tube and
A spring that urges the electroencephalogram electrode unit housed inside the barrel in a direction opposite to the protruding direction,
A fixed cam having a cam groove provided on the inner peripheral surface of the shaft cylinder and
A knock body having an uneven cam tooth at the tip, which is slidably arranged in the forward / backward direction along the cam groove, and a knock body.
A rotating cam having a cam tooth support that meshes with the cam tooth,
The electroencephalogram measuring device according to claim 6.
It has a plurality of electrode holding portions to which the electroencephalogram electrode unit is attached, and has a plurality of electrode holding portions.
The frame has a pair of rails provided in parallel and has a fixing frame mounted on the head.
The electrode holding portion has a connecting portion that connects to each of the rails.
In the state where the electroencephalogram electrode unit is not attached, the connecting portion and the rail are not fixed, and as the electroencephalogram electrode unit is attached and the pressure contact state between the electroencephalogram electrode unit and the scalp becomes stronger, the pressure contact state between the electroencephalogram electrode unit and the scalp becomes stronger. The fixing between the electrode holding portion and the rail becomes stronger.
The electroencephalogram measuring device according to any one of claims 1 to 7.
The electroencephalogram measuring device according to any one of claims 1 to 8, wherein the electroencephalogram electrode unit does not have an elastic member between the electroencephalogram electrode unit main body and the electrode portion.