JP2016220770A - Electroencephalograph - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electroencephalograph which allows the electrodes to be positioned easily and accurately.SOLUTION: An electroencephalograph 10 comprises: a belt-like body frame 20 extending from the vertex side toward the left and right ear pinnae when put on the head; brain wave electrodes 35 movable in a longitudinal direction of the body frame 20; and measurement units 52 mounted to the body frame 20 and configured such that the tragi are visible so as to allow the brain wave electrodes 35 to be positioned relative to the vertex. The measurement units 52 have first scales 55 formed to measure the position of the respective tragi, and the body frame 20 has second scales 21 affixed thereto to position the respective brain wave electrodes 35.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an electroencephalograph.

  An electroencephalograph is known as a device for measuring brain activity. The electroencephalograph measures the brain activity non-invasively by measuring the change in electric potential associated with the brain activity by the electrode arranged on the scalp. In addition, the electrode arrangement method of the electroencephalograph is the standard electrode arrangement according to the International 10-20 method.

  The arrangement of electrodes according to the international 10-20 method is determined as follows. First, as shown in FIG. 18 (a), the first distance D1 of the head surface from the nasal root through the parietal to the occipital nodule and the left auricle as shown in FIG. 18 (b). The second distance D2 (interauricular parietal arc length) of the head surface from the anterior point to the right anterior pinna point via the parietal is measured. Next, the median center portion Cz is determined from the midpoint of the first distance D1 and the midpoint of the second distance D2. Next, as shown in FIGS. 18 (a) to 18 (c), the entire area between the nasal root and the occipital nodule and between the left and right anterior pinna is defined as “100%”, as shown in FIGS. Positions divided into proportions are determined as electrode placement positions.

  However, the international 10-20 method measures the first distance D1 and the second distance D2, calculates the electrode arrangement position based on the measured first distance D1 and second distance D2, and then sets the electrode at the arrangement position. Therefore, the work of arranging the electrode on the head is complicated.

  Therefore, the electrode positioning device of Patent Document 1 includes a positioning member for positioning the electrodes at the central portions C3 and C4 which are predetermined positions of the head. Thereby, when the electrode positioning unit device is mounted on the head, the electrodes are arranged in the center portions C3 and C4 of the head by the positioning member. For this reason, the operation | work which arrange | positions the electrode to a head is simplified.

Special table 2013-509906 gazette

The electrodes of the electrode positioning apparatus of Patent Document 1 are arranged at the central portions C3 and C4 or at positions approximately close thereto. However, there is room for further improvement in terms of electrode placement accuracy.
An object of the present invention is to provide an electroencephalograph capable of easily and accurately arranging electrodes.

  One embodiment of the electroencephalograph according to the present invention is an electroencephalograph that can be mounted on the head with its position aligned with the top of the head, and extends from the top of the head toward the left and right auricles when mounted on the head. A belt-like main body frame, an electrode movable in the longitudinal direction of the main body frame, and a reference position provided on the main body frame and serving as a reference position for determining the position of the electrode with respect to the crown A reference position measuring unit configured to be visible, the reference position measuring unit includes a first position display unit for measuring the reference position, and the main body frame is configured so that the electrode is positioned on the top of the head. A second position display unit for positioning is provided.

  The above electroencephalograph can arrange electrodes easily and accurately.

The block diagram which shows the structure of the rehabilitation system containing the electroencephalograph of one Embodiment. The exploded perspective view of an electroencephalograph. The front view of the electroencephalograph of FIG. The top view of the electroencephalograph of FIG. The side view of a part of the electroencephalograph of FIG. The front view of the modeled electroencephalograph. The flowchart which shows the procedure of the mounting method of an electroencephalograph. The side view of a user's head. The top view of the state with which the electroencephalograph was mounted | worn by the user. The front view of the state with which the electroencephalograph was mounted | worn by the user. (A) Front view of electrode part, (b) Side view of electrode part. The front view of the reference position measurement part which shows the relationship between the reference position measurement part of an electroencephalograph and an auricle. A side view of a part of an electroencephalograph. The front view of the state in which the electroencephalograph was mounted | worn with the user, and the reference | standard position measurement part was removed. The side view of a part of an electroencephalograph of a modification. The side view of a part of electroencephalograph of another modification. The front view of the reference | standard position measurement part in the electroencephalograph of another modification. (A) The side view of the head where an electrode is arranged, (b) The front view of the head where an electrode is arranged, (c) The top view of the head where an electrode is arranged.

Hereinafter, a rehabilitation system used to assist voluntary movement based on electroencephalogram analysis during rehabilitation by exercise therapy will be described.
As shown in FIG. 1, the rehabilitation system 1 includes an electroencephalograph 10, a presentation device 80, and an electric appliance 90. Hereinafter, operation | movement of each structure of the rehabilitation system 1 is demonstrated using FIG.

  The electroencephalograph 10 has a headphone shape that is worn on the head of a patient who is a user. The electroencephalograph 10 detects, for example, an electroencephalogram in the left motor area that controls the voluntary movement of the patient's right half body and an electroencephalogram in the right motor area that controls the voluntary movement of the patient's left half body. The electroencephalograph 10 amplifies the detected electroencephalogram to generate an electroencephalogram signal, and outputs the electroencephalogram signal to the presentation device 80 by radio, for example.

  The presentation device 80 includes a speaker 81, an image display unit 82, an operation unit 83, and a control device 84. The speaker 81 presents sound or voice to the patient based on the acoustic signal input from the control device 84. The image display unit 82 presents visual information to the patient based on a control signal given from the control device 84. The information presented to the patient includes instruction information relating to an instruction on what kind of image the patient should take and feedback information indicating whether the patient is imaged as instructed.

  The operation unit 83 is configured as, for example, a mouse or a touch panel. A rehabilitation assistant, for example, an occupational therapist, registers various information about the patient in the control device 84 via the operation unit 83 or inputs an instruction to start or stop training for the control device 84. When the operation unit 83 is configured as a touch panel, it can be integrated with the image display unit 82.

  The electric appliance 90 includes an appliance 91 to be attached to a patient's finger and arm, an electric motor 92, and a muscle stimulation electrode 93. The electric motor 92 is attached near the elbow of the appliance 91. The output shaft of the electric motor 92 and the finger rest portion of the appliance 91 are connected by a wire (not shown). For this reason, when the electric motor 92 rotates, the finger resting part is pulled by the wire, so that the patient's finger can be moved dynamically.

  The muscle stimulation electrode 93 is an electrode for applying muscle stimulation to the patient's forearm. The muscle stimulation electrode 93 gives electrical stimulation to the patient's forearm by current control between the electrodes 93 by a control device 84 controlled based on the timing of ERD detection, for example. This electrical stimulation becomes muscle stimulation of the patient's forearm. The passive movement associated with the muscle stimulation and the control of the electric motor 92 serves as feedback to the somatic sensation of the patient.

  Rehabilitation training is started by a start instruction from the operation unit 83. A start instruction is input from the operation unit 83 to the control device 84 by the operation of the rehabilitation assistant or the patient himself, and a series of training processes is executed.

  As an example, the training process alternately repeats a stable period in which it is required to relax and not recall specific thoughts, and an exercise image period in which it is required to express exercise intention. For example, the patient repeats the operation of releasing the grasped peg PG during the motion image period. When the training process is executed, the control device 84 displays a message such as “Please relax” during the stable period, and a message such as “Please image” during the exercise image period, to the image display unit 82. Display. The control device 84 causes the speaker 81 to present a notification sound at the start of the rest period and at the start of the exercise image period. The patient recognizes from the at least one of the notification sound from the speaker 81 and the display content of the image display unit 82 that the period has shifted from the stable period to the exercise image period, and expresses the exercise intention.

  Next, the detailed configuration of the electroencephalograph 10 will be described with reference to FIGS. In the following description, the width direction X of the electroencephalograph 10 in the front view of the electroencephalograph 10 is referred to as “width direction X”, and the front-rear direction Y is referred to as “front-rear direction Y”. A direction perpendicular to the width direction X and the front-rear direction Y is defined as a “height direction Z”.

  As shown in FIG. 2, the electroencephalograph 10 includes a belt-like main body frame 20 that is semicircular when viewed from the front, two electrode portions 30 </ b> R and 30 </ b> L, and a reference electrode 70 as electrode portions attached to the main body frame 20. It has. The electroencephalograph 10 includes a main body 40 that generates a potential difference between the potentials of the electrode portions 30R and 30L and the reference potential of the reference electrode 70 as an electroencephalogram signal and outputs the electroencephalogram signal to the presentation device 80 of FIG. .

  The electrode portions 30R and 30L are arranged at positions where it is easy to measure an electroencephalogram related to the patient's intention to exercise when the patient wears the electroencephalograph 10 on the head. Specifically, the electrode portions 30R and 30L are located at positions that can correspond to, for example, the left motor area that controls the voluntary movement of the patient's right body and the right motor area that controls the voluntary movement of the patient's left body. It is preferable to arrange. As an example of the position of the electrode that can correspond to each of the left motor area and the right motor area, in the International 10-20 method, the positions of the central portions C4 and C3 of the head can be cited. Using the same rehabilitation system 1 for both a patient with left-side paralysis and a patient with right-side paralysis by associating the arrangement of the electrode portions 30R and 30L with the left motor area and the right motor area, respectively. it can. In addition, from the viewpoints of weight reduction, simple mounting, and the like, a headset in which an electrode is mounted only on one side of the motor field may be used.

  The body frame 20 extends from the top of the head toward the left and right auricles when mounted on the patient's head. A main body portion 40 is attached to the central portion of the main body frame 20 in the longitudinal direction. The electrode portion 30R is attached to one side of the main body frame 20 in the longitudinal direction with respect to the main body portion 40 so as to be movable in the longitudinal direction of the main body frame 20, and the electrode portion 30L is movable on the other side in the longitudinal direction of the main body frame 20. It is attached.

  A reference electrode 70 is attached to one end of the main body frame 20 in the longitudinal direction. The reference electrode 70 may be attached to the other end portion in the longitudinal direction of the main body frame 20 or may be attached to both end portions in the longitudinal direction of the main body frame 20. When the reference electrodes 70 are attached to both ends in the longitudinal direction of the main body frame 20, the average of the potentials of the reference electrodes 70 may be used as the reference potential.

  The main body 40, the electrode parts 30R and 30L, and the reference electrode 70 are electrically connected by a lead wire (not shown). The lead wire is accommodated in the main body frame 20.

  The electrode portions 30 </ b> R and 30 </ b> L include an attachment portion 31 that is movably attached to the main body frame 20. The attachment portion 31 is attached to the main body frame 20 so as to straddle the main body frame 20 in the front-rear direction Y. An adjustment knob that switches between a state in which the attachment portion 31 is movable with respect to the main body frame 20 and a state in which the attachment portion 31 is incapable of movement with respect to the main body frame 20 at a portion in front of the main body frame 20 in the attachment portion 31. 32 is provided. A first case 33 having an elliptic cylindrical shape in which the longitudinal direction of the main body frame 20 is the longitudinal direction is attached to a portion of the attachment portion 31 behind the main body frame 20. A second case 34 is fitted to the first case 33 so as to be movable with respect to the first case 33.

  As shown in FIG. 3, a pair of electroencephalogram electrodes 35 is inserted into the first case 33. The pair of electroencephalogram electrodes 35 are, for example, silver-silver chloride electrodes, and can move integrally with the second case 34 with respect to the first case 33. The pair of electroencephalogram electrodes 35 are arranged side by side in the longitudinal direction of the first case 33. Of the pair of electroencephalogram electrodes 35, the electroencephalogram electrode 35 on the center side in the longitudinal direction of the main body frame 20 is for detecting the electroencephalograms of the central portions C3 and C4. Of the pair of electroencephalogram electrodes 35, the electroencephalogram electrode 35 on the end side in the longitudinal direction of the main body frame 20 is for detecting the electroencephalograms C3L and C4L around the central portions C3 and C4 shown in FIG.

  A spring (not shown) is accommodated in the internal space formed by the first case 33 and the second case 34. One end of the spring is attached to the first case 33, and the other end is attached to the second case 34.

  As shown in FIG. 2, the main body 40 includes a case 41 attached to the main body frame 20. Inside the case 41 are housed a circuit unit 42 that generates an electroencephalogram signal and outputs it to the presentation device 80 shown in FIG. 1, and a power supply unit 43 that supplies power to the circuit unit 42. An example of the power supply unit 43 is a battery. The circuit unit 42 includes a potential difference between the potential measured by the electroencephalogram electrode 35 of the electrode unit 30R and the reference potential of the reference electrode 70, and a potential difference between the potential measured by the electroencephalogram electrode 35 of the electrode unit 30L and the reference potential of the reference electrode 70. A differential amplifier circuit for amplifying each of the above. The circuit unit 42 includes a communication circuit that wirelessly transmits an electroencephalogram signal to the presentation device 80.

  As shown in FIG. 4, the case 41 is formed with an opening 41 </ b> A for confirming the mid-center Cz shown in FIG. 9 when the electroencephalograph 10 is attached to the head. The opening 41 </ b> A is formed at the center in the longitudinal direction of the main body frame 20. The position of the opening 41A in the front-rear direction Y is the same as the positions of the electrode portions 30R and 30L.

  As shown in FIG. 2, the electroencephalograph 10 is configured to suppress the position shift of the tragus position measurement unit 50 for measuring the position of the tragus with respect to the median center part Cz and the body frame 20 with respect to the head. A presser portion 60 is provided. The position of the tragus is an example of a reference position that is a reference position for determining the position of the electroencephalogram electrode 35 with respect to the median center Cz.

  The tragus position measurement unit 50 and the presser unit 60 are attached to both ends of the main body frame 20 in the longitudinal direction. The tragus position measurement unit 50 is attached to the outside of the main body frame 20, and the presser portion 60 is attached to the inside of the main body frame 20.

  The tragus position measurement unit 50 includes a fixing unit 51 that is fixed to an end of the main body frame 20 in the longitudinal direction. The fixing portion 51 extends rearward from the main body frame 20. A measuring unit 52, which is an example of a reference position measuring unit for measuring the position of the tragus, is detachably attached to the fixing unit 51. The measurement unit 52 is inserted in the width direction X with respect to the fixed unit 51.

The measurement unit 52 includes an attachment portion 53 that is a portion inserted into the fixing portion 51 and a cover portion 54 that extends in the height direction Z with respect to the attachment portion 53.
At both end portions in the front-rear direction Y of the attachment portion 53, protrusions 53A extending from the both end portions in the front-rear direction Y are formed. When the attachment portion 53 is inserted into the fixed portion 51, the protrusion 53 </ b> A contacts the fixed portion 51 in the front-rear direction Y and the height direction Z, so that the measuring portion 52 is moved in the front-rear direction Y and the height direction Z with respect to the fixed portion 51. Movement is restricted.

  Two grooves 53 </ b> B extend along the front-rear direction Y in a portion of the measurement unit 52 that faces the fixed unit 51 in the height direction Z. The two grooves 53B are formed at an interval in the width direction X.

  Although not shown, a portion of the fixing portion 51 that faces the mounting portion 53 in the height direction Z is provided with a pair of protrusions that fit into the groove 53B. The pair of protrusions are formed at both ends of the fixing portion 51 in the front-rear direction Y. When the measurement unit 52 is attached to the fixed unit 51, the measurement unit 52 is held with respect to the fixed unit 51 by fitting the pair of protrusions into one of the grooves 53 </ b> B.

  The cover part 54 is a colorless and transparent plate-like member. The front end portion of the cover portion 54 is formed in a curved protrusion shape in the height direction Z. The dimension of the cover part 54 in the front-rear direction Y is preferably larger than the standard length Y of the auricle, and the dimension of the cover part 54 in the height direction Z is in the standard height direction Z of the auricle. Preferably it is larger than the dimension.

  The pressing portion 60 includes a contact portion 61 for contacting the temple of the head and an adjustment portion 62 that can adjust the protruding distance of the contact portion 61 from the main body frame 20 in the longitudinal direction of the main body frame 20. .

  The contact portion 61 includes a cushion 61A that extends in the front-rear direction Y and can contact the temples, and a holding portion 61B that extends in the front-rear direction Y and holds the cushion 61A. Anti-slip portions 61C are formed at both ends in the front-rear direction Y of the holding portion 61B. The anti-slip portion 61C includes three protrusions protruding in the front-rear direction Y, and suppresses the finger from slipping when the occupational therapist or the patient grasps the contact portion 61 to adjust the position of the contact portion 61. .

  As shown in FIG. 3, the adjusting portion 62 is fixed to the housing case 62 </ b> A that forms a housing space with the main body frame 20 and the holding portion 61 </ b> B of the contact portion 61, and is inserted into the housing space of the housing case 62 </ b> A. Plate member 62B. The housing case 62 </ b> A extends along the longitudinal direction of the main body frame 20. Although not shown, the housing case 62 </ b> A is formed with a plurality of recesses arranged at intervals in the longitudinal direction of the main body frame 20. Although not shown, a curved convex portion that fits into the concave portion is formed at the tip portion of the plate member 62B. By fitting the curved convex portion of the plate member 62B into the concave portion of the housing case 62A, the drop of the plate member 62B from the housing case 62A, that is, the dropping of the contact portion 61 is suppressed. When the contact portion 61 is pulled in the longitudinal direction, the curved convex portion of the plate member 62B rides over the concave portion, so that the contact portion 61 and the plate member 62B move integrally with respect to the housing case 62A.

Next, the positioning structure of the electrode portion 30L will be described with reference to FIGS. The same applies to the positioning structure of the electrode portion 30R.
As shown in FIG. 5, a first scale 55 that is an example of a first position display unit for measuring the position of the tragus is formed in the cover portion 54 of the tragus position measurement unit 50. . The first scale 55 includes, for example, five lines 55 </ b> A that extend in the front-rear direction Y in the cover portion 54, and is molded integrally with the cover portion 54, for example. As shown in FIG. 5, the line 55 </ b> A constituting the first scale 55 extends over the entire front-rear direction Y of the cover portion 54. Note that the line 55 </ b> A may be formed only in a part of the cover part 54 in the front-rear direction Y as long as the position of the tragus can be read with a scale.

  Numbers “1” to “5” are attached to the front end portions of the five lines 55A. In the state where the electroencephalograph 10 is attached to the patient, “5” is attached so as to be adjacent to the upper side of the lowermost line 55 </ b> A in the cover portion 54. The remaining four lines 55A are attached so that “4”, “3”, “2”, and “1” are adjacent to each line 55A on the upper side from the lower side to the upper side of the cover portion 54. ing. Numbers may not be attached. Further, the numbers may not be attached adjacent to the upper side of the line 55A, and for example, may be attached to the space between the lines 55A and 55A.

  The main body frame 20 is provided with a second scale 21 which is an example of a second position display unit for determining the position of the electrode portion 30L with respect to the center of the center Cz. The second scale 21 includes five lines 21 </ b> A extending in the front-rear direction Y in the main body frame 20. The second scale 21 is configured, for example, by sticking a printed matter on which five lines 21 </ b> A are printed to the main body frame 20.

  For example, numerals “1” to “5” are attached to the front end portions of the five lines 21A. In a state where the electroencephalograph 10 is attached to the patient, “5” is attached so as to be adjacent to the lower side of the lowermost line 55 </ b> A in the main body frame 20. In the remaining four lines 21A, “4”, “3”, “2”, “1” are adjacent to the lower side with respect to the respective lines 21A in the longitudinal direction of the main body frame 20 from the lower side to the upper side. It is attached as follows. Numbers may not be attached. Further, the numbers may not be attached adjacent to the lower side of the line 21A, and may be attached to the space between the lines 21A and 21A, for example.

The first scale 55 and the second scale 21 of the electrode portion 30L are determined as follows. The second scale 21 of the electrode part 30R is determined in the same manner.
In the following description, as shown in FIG. 6, the radius of the main body frame 20 is “Rh”. Also, “S” is the length of the interaural parietal arc that is the length along the surface of the head passing through the median central part Cz that is the parietal between the left and right tragus, and the maximum value of the interaural parietal arc length is “ Smax "and the minimum value are" Smin ". For example, the maximum value (Smax) of the interarbus parietal arc length S is set to “405.0 mm”, and the minimum value (Smin) is set to “334.0 mm”. In addition, the distance from the end in the longitudinal direction of the main body frame 20 to the tragus is “PE”, the maximum value of the distance PE is “PEmax”, and the minimum value of the distance PE is “PEmin”. Further, the distance from the median center portion Cz to the electroencephalogram electrode 35 positioned at the center portions C3 and C4 shown in FIG. 14 is “PP”, the maximum value of the distance PP is “PPmax”, and the minimum value of the distance PP Is “PPmin”. It should be noted that the interaural head arc length S corresponds to the second distance D2 in FIG.

When 1/2 of the circumferential length (πRh) of the semicircle of the main body frame 20 and the distance PE from the end in the longitudinal direction of the main body frame 20 to the tragus are added, 1 / of the interarbicular parietal arc length S Since it becomes equal to 2, the distance PE is calculated by the following equation (1).
PE = 1/2 * S-1 / 2 * (pi) Rh ... (1)

For this reason, the maximum value PEmax of the distance PE and the minimum value PEmin of the distance PE are calculated by the following formulas (2) and (3) using the maximum value Smax and the minimum value Smin of the interarbus parietal arc length S. .
PEmax = 1/2 * Smax-1 / 2 * [pi] Rh (2)
PEmin = 1/2 × Smin−1 / 2 × πRh (3)

At this time, the range PER where the tragus is located is calculated by the following equation (4).
PER = PEmax−PEmin (4)

And as above-mentioned, since the 1st scale 55 consists of five lines 55A, the scale width PED which is the distance between 55 A of adjacent lines is calculated by the following formula | equation (5).
PED = PER / 5 (5)

For example, when the radius of the main body frame 20 is “80 mm”, the maximum value PEmax of the distance PE is “76.8 mm” from the above equation (2), and the minimum value PEmin of the distance PE is “41” from the above equation (3). .4 mm ". From the above equations (4) and (5), the scale width PED is “7.08 mm”.
Further, in the international 10-20 method, when the intercuspal parietal arc length S is “100%”, the distance from the median central part Cz to one tragus is “50%”, and the position of the central part C3 Is a position “20%” from the center of the center Cz. For this reason, the distance PP from the median center Cz to the electroencephalogram electrode 35 located at the center C3 is calculated by the following equation (6).
PP = 20/50 × 1/2 × S (6)

For this reason, the maximum value PPmax of the distance PP and the minimum value PPmin of the distance PP are calculated by the following formulas (7) and (8) using the maximum value Smax and the minimum value Smin of the interarbus parietal arc length S. .
PPmax = 20/50 × 1/2 × Smax (7)
PPmin = 20/50 × 1/2 × Smin (8)

At this time, the range PPR in which the electroencephalogram electrode 35 is located because it is located in the central portions C3 and C4 is calculated by the following equation (9).
PPR = PPmax−PPmin (9)

And as above-mentioned, since the 2nd scale 21 consists of five lines 21A, the scale width PPD which is the distance between the adjacent lines 21A is calculated by the following formula | equation (10).
PPD = PPR / 5 (10)

  When the radius of the main body frame 20 is “80 mm”, the maximum value PPmax of the distance PP is “81.0 mm” and the minimum value PPmin of the distance PP is “66.8 mm” from (7). From the above equations (9) and (10), the scale width PPD is “2.84 mm”.

  As described above, the scale width PED of the first scale 55 and the scale width PPD of the second scale 21 are determined, that is, the correspondence relationship between the scale width PED and the scale width PPD is determined. The scale 55 and the second scale 21 have a corresponding relationship.

  As shown in FIG. 5, the first scale 55 is formed on the cover portion 54 so that each line 55 </ b> A is located in a range PER where the tragus is located. Therefore, the line 55A corresponding to the number “1” indicates the minimum value PEmin of the distance PE from the longitudinal end of the main body frame 20 to the tragus, and the line 55A corresponding to the number “5” is the maximum distance PE. The value PEmax is indicated.

  The second scale 21 is affixed to the main body frame 20 so that each line 21A is located in a range PPR where the electroencephalogram electrode 35 is located in order to be located at the center C3. Therefore, the line 21A corresponding to the number “1” indicates the minimum value PPmin of the distance PP from the median center portion Cz to the electroencephalogram electrode 35 located at the center portion C3, and the line 21A corresponding to the number “5” is The maximum value PPmax of the distance PP is shown.

Next, a method for mounting the electroencephalograph 10 will be described with reference to FIGS.
As shown in FIG. 7, the method for attaching the electroencephalograph 10 includes a mid-center measurement process in step S1, an electroencephalograph attachment process in step S2, a tragus position measurement process in step S3, an electrode position adjustment process in step S4, And the measurement part removal process of step S5 is included.

  As shown in FIG. 8, in the mid-center measurement process of step S <b> 1, for example, an occupational therapist who is an assistant of rehabilitation is a occipital region that is a protruding portion of the occipital region from a nasal root that is a depressed portion of the base of the patient's nose. Measure the distance to the nodule with a tape measure. Then, the occupational therapist defines the position of the half of the measurement distance as the mid-center Cz. Then, the occupational therapist affixes a marking MK such as a seal at the position of the center portion Cz in the patient's head. The marking MK may be a method other than the sticking of the seal as long as the position of the median center portion Cz can be visually recognized.

  As shown in FIG. 9, in the electroencephalograph wearing step in step S <b> 2, for example, an occupational therapist attaches the electroencephalograph 10 to the patient's head. At this time, the occupational therapist attaches the electroencephalograph 10 to the patient's head so that the marking MK of the median center portion Cz is visible through the opening 41A of the case 41. Accordingly, the positions of the electrode portions 30R and 30L with respect to the crown in the front-rear direction Y are determined.

  And as FIG. 10 shows, for example, the occupational therapist adjusts the contact part 61 of the holding | suppressing part 60 so that it may become a patient's temple position. Thereby, it is suppressed that the electroencephalograph 10 moves with respect to a head. Further, in the electroencephalograph wearing process, the reference electrode 70 is worn on the left earlobe.

  Further, in the electroencephalograph mounting process, before the electroencephalograph 10 is mounted on the head, the pair of electroencephalogram electrodes 35 of the electrode portions 30R and 30L is attached to the scalp according to the procedure shown in FIGS. 11 (a) and 11 (b). It is in the state separated from. Specifically, as indicated by the white arrow in FIG. 11A, as the second case 34 moves to the side opposite to the attachment portion 31 with respect to the first case 33, a pair of electroencephalogram electrodes 35. Moves into the first case 33. Thereby, the protrusion distance from the 1st case 33 of a pair of electroencephalogram electrode 35 becomes small. At this time, the spring accommodated in the internal space formed by the first case 33 and the second case 34 extends as the second case 34 moves relative to the first case 33. For this reason, the force biased toward the attachment part 31 by a spring is applied to the second case 34.

  11B, the second case 34 moves rearward with respect to the first case 33, and the end surface 34A of the opening of the second case 34 is the end surface of the first case 33. Contact 33A. Thereby, even if a spring urges | biases the 2nd case 34 to the attachment part 31 side, the movement to the attachment part 31 of the 2nd case 34 is restrict | limited. Thereby, each electroencephalogram electrode 35 will be in the state which does not contact a scalp.

  As shown in FIG. 12, in the tragus position measurement process in step S <b> 3, for example, the occupational therapist reads the first scale 55 of the cover part 54 of the tragus position measurement unit 50, whereby the tragus for the cover part 54 is obtained. Get the position of the top of. In one example, the first scale 55 corresponding to the position of the top of the tragus is “3”. The first scale 55 is preferably read horizontally.

  As shown in FIG. 13, in the electrode position adjustment process in step S <b> 4, for example, the occupational therapist loosens the adjustment knob 32 of the electrode part 30 </ b> L to make the electrode part 30 </ b> L movable with respect to the main body frame 20. Then, the occupational therapist sets the electrode portion 30 </ b> L to “3” on the second scale 21.

  Specifically, the occupational therapist first operates the adjustment knob 32 of the electrode part 30 </ b> L so that the electrode part 30 </ b> L can be moved with respect to the main body frame 20. Next, the occupational therapist uses the electrode portion 30 </ b> L so that the side surface 31 </ b> A on the end portion side of the main body frame 20 of the attachment portion 31 coincides with the “3” line 21 </ b> A of the second scale 21 in the longitudinal direction of the main body frame 20. Move. Next, the occupational therapist operates the adjustment knob 32 to fix the electrode portion 30 </ b> L in an unmovable state with respect to the main body frame 20. Finally, the occupational therapist fits the second case 34 of the electrode portion 30L into the first case 33. Thereby, the electroencephalogram electrode 35 protrudes from the first case 33 and is pressed against the scalp. Then, the occupational therapist moves the electrode unit 30 </ b> R so that the electrode unit 30 </ b> R matches the “3” line 21 </ b> A of the second scale 21 in the same procedure. In addition, the order of the electrode parts 30R and 30L to be moved is not limited.

  As shown in FIG. 14, in the measurement unit removal process in step S <b> 5, for example, the occupational therapist removes the measurement unit 52 from the fixing unit 51 of the tragus position measurement unit 50. Note that the measurement unit 52 does not necessarily have to be removed from the fixing unit 51. That is, the measurement part removing step can be omitted.

According to the electroencephalograph 10 of the present embodiment, the following actions and effects can be obtained.
(1) The electroencephalograph 10 includes a tragus position measurement unit 50 having a first scale 55 and a main body frame 20 having a second scale 21. According to this configuration, the positions of the electroencephalogram electrodes 35 of the electrode portions 30 </ b> R and 30 </ b> L with respect to the median center portion Cz are determined based on the second scale 21 from the position of the tragus measured based on the first scale 55. Since the electroencephalogram electrodes 35 of the electrode portions 30R and 30L are thus positioned based on the scales 55 and 21, the positions of the electroencephalogram electrodes 35 of the electrode portions 30R and 30L with respect to the median center portion Cz are easily and accurately adjusted. be able to.

  (2) The first scale 55 and the second scale 21 have a corresponding relationship. According to this configuration, it is not necessary to calculate the distance from the median center Cz to the electroencephalogram electrode 35 every time the electroencephalograph 10 is used. Moreover, the position of the electroencephalogram electrode 35 can be easily adjusted to an appropriate position using the second scale 21 from the measurement result of the position of the tragus by the first scale 55. Therefore, the positions of the electroencephalogram electrodes 35 of the electrode portions 30R and 30L with respect to the median center portion Cz can be adjusted more easily.

  (3) The electroencephalograph 10 includes a presser portion 60 for pressing the temple when it is attached to the head. According to this configuration, the position of the main body frame 20 relative to the head is suppressed by the presser 60. Therefore, the position of the electroencephalogram electrode 35 attached to the main body frame 20 is suppressed from shifting.

  (4) The presser portion 60 includes a contact portion 61 for pressing the temple and an adjustment portion 62 that can adjust the protruding distance of the contact portion 61 from the longitudinal end portion of the main body frame 20. According to this configuration, the patient or occupational therapist can adjust the contact portion 61 to the temple by moving the contact portion 61 with respect to the main body frame 20 by the adjusting portion 62.

  (5) The tragus position measurement unit 50 can be attached to and detached from the fixing unit 51 in which the measurement unit 52 that measures the position of the tragus is fixed to the main body frame 20. According to this configuration, the measurement unit 52 does not cover the patient's ear by removing the measurement unit 52 after the electroencephalograph 10 is mounted on the patient's head. For this reason, it is suppressed that the cover part 54 covers an ear | edge during rehabilitation training, and giving a discomfort to a patient.

  (6) The main body 40 includes a circuit unit 42 that amplifies the potential difference between the potential of the electroencephalogram electrode 35 and the potential of the reference electrode 70. According to this configuration, the main body 40 can acquire an electroencephalogram signal with high accuracy.

  (7) The main body 40 has an opening 41A that allows the marking MK attached to the midline center Cz of the head to be visually recognized. According to this configuration, the position of the electroencephalograph 10 with respect to the head can be easily adjusted to an appropriate position.

  (8) The electrode portions 30R and 30L switch between a state in which the electroencephalogram electrode 35 is pushed by the scalp and a state in which the electroencephalogram electrode 35 is separated from the scalp as the second case 34 moves relative to the first case 33. According to this configuration, when the electrode portions 30R and 30L move in the longitudinal direction of the main body frame 20, the electroencephalogram electrode 35 can be in a state separated from the scalp. For this reason, the movement of the electroencephalogram electrode 35 becomes smooth when the alignment of the electroencephalogram electrode 35 to the central portions C3 and C4 is performed.

  The description regarding the said embodiment is an illustration of the form which the electroencephalograph according to this invention can take, and it does not intend restrict | limiting the form. The electroencephalograph according to the present invention may take a form in which, for example, a modification of the above-described embodiment described below and at least two modifications not contradicting each other are combined.

In the above embodiment, the adjustment unit 62 of the presser unit 60 may be omitted. In this case, the contact portion 61 of the presser portion 60 is fixed so as not to move with respect to the main body frame 20.
In the above embodiment, the presser portion 60 may be omitted.

In the above embodiment, the measurement unit 52 of the tragus position measurement unit 50 may be fixed to the fixing unit 51 with a screw, for example.
In the above embodiment, the measurement unit 52 and the fixing unit 51 may be fixed so as not to be detachable. In the case where the measurement unit 52 and the fixing unit 51 are not removable, the measurement unit removal step of the method for attaching the electroencephalograph 10 is omitted.

In the above embodiment, the electroencephalogram electrode 35 may be an electrode other than a silver-silver chloride electrode as long as it can detect a change in potential due to brain activity.
In the above embodiment, the number of lines 55A of the first scale 55 and the number of lines 21A of the second scale 21 may be any of 2 to 4, or 6 or more.

  In the above embodiment, the first scale 55 may be configured by sticking a printed matter on which the line 55 </ b> A is printed to the cover portion 54. In this case, the printed material is preferably colorless and transparent at portions other than the line 55A. However, when the printed material is attached to a portion other than the region where the tragus can be visually recognized in the cover portion 54, the printed material is not colorless and transparent. It may be a color. In addition, as for the part other than the area | region which can visually recognize a tragus, the front-end part of the cover part 54 is mentioned, for example.

  In the above embodiment, the measurement unit 52 may be formed by further extending the main body frame 20 in the height direction Z from the end of the main body frame 20. That is, the main body frame 20 and the measurement unit 52 may be integrally formed.

  In the above embodiment, the first position display unit of the tragus position measurement unit 50 may be a scale 55 </ b> B as shown in FIG. 15 instead of the first scale 55. The scale 55 </ b> B is formed so as to be able to measure the distance extending in the height direction Z from the longitudinal end of the main body frame 20.

  In the above embodiment, the second position display unit of the main body frame 20 may be a scale 21 </ b> B as shown in FIG. 15 instead of the second scale 21. The scale 21 </ b> B is formed so as to be able to measure a distance along the longitudinal direction of the main body frame 20 from the median center portion Cz.

  In the above embodiment, the first position display unit of the tragus position measurement unit 50 uses different colors for the areas between the lines 55A as shown in FIG. 16 instead of the numbers on the first scale 55. It may be. Each of the regions between the lines 55A has a purple color corresponding to “1”, a yellow color corresponding to “2”, a red color corresponding to “3”, and “4” from the base end side to the front end side of the cover portion 54. The corresponding blue color and the green color corresponding to “5” are obtained. Note that the color of the area between the lines 55A is not limited to the color shown in FIG. 16, and may be other colors. Moreover, it is good also considering the scale for measuring the position of a tragus as a boundary line of an adjacent color instead of the line 55A. That is, the line 55A may be omitted from the first scale 55 in FIG.

  Furthermore, instead of the second scale 21, the second position display unit of the main body frame 20 may change the regions between the lines 21 </ b> A to different colors as shown in FIG. 16. Each of the regions between the lines 21A has a purple color corresponding to “1”, a yellow color corresponding to “2”, a red color corresponding to “3”, “from the center side to the end side in the longitudinal direction of the main body frame 20,“ The color is blue corresponding to “4” and green corresponding to “5”. Note that the color of the region between the lines 21A is not limited to the color shown in FIG. 16, and may be other colors. Further, the scale for determining the position of the electroencephalogram electrode 35 may be a boundary line of adjacent colors instead of the line 21A. That is, the line 21A may be omitted from the second scale 21 in FIG.

  In the electroencephalograph 10 of FIG. 16, for example, the occupational therapist makes the color of the second scale 21 the same as the color corresponding to the position of the tragus measured by the first scale 55 of the measurement unit 52. The positions of the electrode portions 30R and 30L are adjusted.

  In the above embodiment, instead of the number of the first scale 55 and the number of the second scale 21, a pattern such as a round shape, a triangle shape, or a square shape may be used. For example, the occupational therapist adjusts the positions of the electrode portions 30R and 30L so that the design of the second scale 21 becomes the same design as the design corresponding to the position of the tragus in the first scale 55.

In the above embodiment, the cover portion 54 is not limited to being colorless and transparent, and may be configured to be translucent as long as the auricle is visible.
-In above-mentioned embodiment, as FIG. 17 shows, the measurement part 52 of the tragus position measurement part 50 may be formed with the cover part 54 in the opening part 56 from which the tragus can be seen. A first scale 55 is formed in a portion of the cover portion 54 in front of the opening portion 56. The cover part 54 in which the opening part 56 was formed may not be colorless and transparent, and may be formed with a color without translucency.

  In the above embodiment, the position of the electroencephalogram electrode 35 with respect to the head may be a position other than the central portions C3 and C4. In short, the position of the electroencephalogram electrode 35 can be changed according to the purpose of training of the rehabilitation system 1.

10: Electroencephalograph 20: Body frame 21: Second scale (second position display section)
35: Electroencephalogram electrode (electrode)
42: Circuit unit 52: Measuring unit (reference position measuring unit)
55: First scale (first position display section)
60: Presser part 61: Contact part 62: Adjustment part Cz: Center of the center

Claims (7)

An electroencephalograph that can be attached to the head with its position aligned to the top of the head,
A belt-like body frame that extends from the top of the head toward the left and right auricles when worn on the head;
An electrode movable with respect to the longitudinal direction of the main body frame;
A reference position measuring unit provided on the main body frame and configured so that a reference position which is a reference position for determining the position of the electrode with respect to the crown can be visually observed;
The reference position measurement unit has a first position display unit for measuring the reference position,
The body frame includes an electroencephalograph having a second position display unit for positioning the electrode with respect to the crown. The electroencephalograph according to claim 1, wherein the first position display unit and the second position display unit have a corresponding relationship with each other. The electroencephalograph according to claim 1, further comprising a pressing portion for fixing the main body frame to the head. The presser portion is provided at a contact portion for contacting the head portion and an end portion in a longitudinal direction of the main body frame, and the press portion of the contact portion from an end portion of the main body frame in the longitudinal direction of the main body frame. The electroencephalograph according to claim 3, further comprising an adjustment unit that enables adjustment of the protruding distance. The electroencephalograph according to claim 1, wherein the reference position measurement unit is detachably attached to the main body frame. Further comprising a circuit unit that amplifies the electrical signal detected by the electrode and makes it an electroencephalogram signal,
The electroencephalograph according to claim 1, wherein the circuit unit is provided on the main body frame. The reference position is the position of the tragus,
The electroencephalograph according to any one of claims 1 to 6, wherein the top of the head is a mid-center Cz of the International 10-20 method.