JP3830156B1 - Electroencephalogram detection electrode - Google Patents

Abstract

In electroencephalogram measurement, electroencephalogram including alpha waves generated from the back of the head can be measured, and the electrode can be placed on the head without contaminating the user's hair with a conductive paste or the like. Realize an electroencephalogram detection electrode that can be easily attached and removed without disturbing the hair of any hairstyle, and that there is no pain at the time of wearing and it is difficult for noise to enter.
A main body 1 having a liquid storage chamber 3 having an electrolytic solution therein, a plurality of scalp contact portions 2 made of two thin plates 4 and a water absorbent material 5 sandwiched between the two thin plates 4; The scalp contact portion 2 is at least partially contained in the liquid storage chamber 3 and at least another portion is outside the main body 1. The metal conductor 6 is connected to the thin plate 4 or the water absorbent material 5. The electroencephalogram detection electrode according to claim 1, wherein the scalp contact portion 2 exposed and exposed to the outside of the main body 1 has a hook shape.
[Selection] Figure 5

Description

  The present invention relates to an electroencephalogram detection electrode.

  Conventionally, as an electrode mounting method in electroencephalogram measurement, a method of attaching an electrode on a scalp using an adhesive, a method of using a rubber head band to hold an electrode in a predetermined position, or a plurality of electrodes For example, there is a method of wearing a dedicated head cap in which is disposed. These methods are troublesome to wear, and are accompanied by disturbance of the hair when attaching and detaching. Moreover, since these require a large amount of conductive paste when the electrode is brought into contact with the scalp having scalp hair, the hair must be soiled.

  As a method for solving these problems, a method using a headband in which two to three electrodes are placed in contact with the user's forehead, or glasses arranged in Japanese Patent Laid-Open No. 2000-014787 are arranged. There are methods. Since these are systems in which the electrode is brought into contact with the frontal head without hair, the hair is not soiled by the conductive paste or the like, and the hair is not disturbed during attachment / detachment. However, since alpha waves, which are measurement targets in many electroencephalogram measurements, are generated from the occipital region, it is impossible to perform correct measurement using electrodes disposed only in the frontal region.

  On the other hand, as a method of measuring an electroencephalogram with an electrode arranged on a headphone, Japanese Patent Laid-Open No. 2001-340312 proposes a method in which an electrode is brought into close contact with the head by the elasticity of a spring. However, this does not mention the contact method or the conduction method of the electrode and scalp in the part having the hair. In contrast, JP-A-2001-187034 proposes a method in which an elastic sponge infiltrated with a conductive liquid is attached to the tip of the electrode body, and the electrode and the scalp are reliably contacted through the conductive liquid that has oozed out of the elastic sponge. ing. Although this is easy to install, it is inevitable that the contact area around the contact area of the elastic sponge is contaminated with a large amount of conductive liquid, and the liquid chamber for storing the conductive liquid is located above the elastic sponge. In this case, it is inevitable that a larger amount of the conductive liquid oozes out through the elastic sponge. Further, when the electrode position is at the top of the head, the measurement of alpha waves is incomplete as described above.

  On the other hand, Japanese Patent Application Laid-Open No. 2006-94979 proposes an electrode of a type in which an inverted U-shaped electrode member is used so that the electrode member passes through the hair and directly contacts the scalp. Since this method does not require a conductive paste, it is possible to measure brain waves including alpha waves generated from the back of the head without contaminating the user's hair, and it can be easily attached and detached without disturbing the hair. However, in this method in which no conductive paste is used, noise is mixed unless the electrode and the scalp are brought into close contact with each other. Therefore, since the user needs to wear the electrode on the head so as to press the electrode fairly strongly, it is painful at the time of wearing. In addition, when wearing loosely to avoid pain, the degree of adhesion between the electrode and the scalp is weakened, and noise due to vibration or the like is mixed.

  On the other hand, it consists of a housing with a liquid storage chamber with electrolyte inside, and a scalp contact part with a structure that sandwiches a water-absorbing material between thin plates. The water-absorbing material constantly moisturizes the scalp contact part by sucking up the electrolyte. An electroencephalogram detection electrode that can suppress noise due to the effect of the non-polarized electrode is conceivable. By using this method, it is possible to minimize the contamination of the hair due to the electrolyte, and it is not necessary to press it strongly against the scalp, so that pain during wearing can be minimized. However, when the scalp contact portion is a mere thin plate, depending on the user's hairstyle, the scalp is sandwiched between the thin plate and the scalp, which requires time and effort to remove the scalp. That is, when the user's hair is grouped hair, it is necessary to temporarily remove the grouped hair.

JP 2000-014787 A, JP 2001-340312 A, JP 2001-187034 A, JP 2006-94979 A Internet homepage (Kuwatec Co., Ltd. http://www.random-grp.com/kuwatec/Products/ibva/)

  The present invention has been made in view of the above circumstances, and the problem to be solved is that in the electroencephalogram measurement, an electroencephalogram including an alpha wave generated from the back of the head can be measured, and the user can use a conductive paste or the like. The electrode can be placed on the head without contaminating the hair, and it can be easily detached without disturbing the hair regardless of the hairstyle, and there is no pain when wearing it, and noise is mixed in. This is the realization of an electroencephalogram detection electrode that is difficult.

The present invention has been made to solve the above-described problems, and the invention according to claim 1 includes a main body 1 and a plurality of scalp contact portions 2 formed integrally with or fixed to the main body 1. The scalp contact portion 2 is an electroencephalogram detection electrode characterized by being hook-shaped. The invention according to claim 2 includes a plurality of main bodies 1 each having a liquid storage chamber 3 having an electrolyte solution therein, two thin plates 4 and a water absorbent material 5 sandwiched between the two thin plates 4. It comprises a scalp contact portion 2 and a metal conductor 6 connected to the thin plate 4 or the water-absorbing material 5, and at least a part of the scalp contact portion 2 is contained in the liquid storage chamber 3 and at least another part of the scalp contact portion 2 2. The electroencephalogram detection electrode according to claim 1, wherein the scalp contact portion 2 exposed to the outside of the main body 1 is exposed to the outside of the main body 1 and has a hook shape.

  In brain wave measurement, it is possible to measure brain waves including alpha waves generated from the back of the head, and the electrode can be placed on the head without contaminating the user's hair with conductive paste etc., and the user can use any hairstyle Even so, it was possible to easily attach and detach without disturbing the hair, and furthermore, it was possible to realize an electrode for detecting an electroencephalogram with no pain at the time of wearing and difficult to mix noise.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an electroencephalogram detection electrode according to an embodiment of the present invention. Reference numeral 1 denotes a main body, 2 denotes a scalp contact portion, 4 denotes a thin plate, 5 denotes a water-absorbing material, and 6 denotes a metal conductor. 2 is a side view, FIG. 3 is a top view, and FIG. 4 is a front view. As shown in these figures, the metal conductor 6 is connected to the thin plate 4 or the water absorbent material 5 constituting the scalp contact portion 2, and the water absorbent material sandwiched between the two thin plates 4 and the two thin plates 4. A plurality of scalp contact portions 2 made up of 5 are at least partially contained inside the main body 1, at least other portions are exposed to the outside of the main body 1, and the scalp contact portions 2 exposed to the outside of the main body 1 are hooks It is characterized by its shape.

  FIG. 5 is a partially transparent perspective view of an electroencephalogram detection electrode showing the internal structure of the present invention. Reference numeral 1 denotes a main body, 2 denotes a scalp contact portion, 3 denotes a liquid storage chamber having an electrolytic solution therein, 4 denotes a thin plate, and 5 denotes a water-absorbing material. 6 is a side sectional view, FIG. 7 is a top sectional view, and FIG. 8 is a front sectional view. As shown in these figures, an electroencephalogram detection electrode according to an embodiment of the present invention includes a main body 1 having a liquid storage chamber 3 having an electrolyte therein, a plurality of scalp contact portions 2, and the scalp contact. It comprises a metal conductor 6 connected to a thin plate 4 or a water-absorbing material 5 constituting the part 2, and at least a part of the scalp contact part 2 is contained in the liquid storage chamber 3 and at least another part of the body 1. The scalp contact portion 2 exposed to the outside and exposed to the outside of the main body 1 has a hook shape.

  FIG. 9 is a perspective view showing the structure of the scalp contact portion 2 of the electroencephalogram detection electrode according to the embodiment of the present invention. 4 indicates a thin plate and 5 indicates a water-absorbing material. As shown in this figure, the scalp contact portion 2 of the electroencephalogram detection electrode according to the embodiment of the present invention is composed of two thin plates 4 and a water-absorbing material 5 sandwiched between the two thin plates 4. The contact portion 2 has a hook shape.

  FIG. 10 is a perspective view of the headset type electroencephalogram measurement apparatus according to the embodiment of the present invention. Reference numerals 1 and 2 denote the electroencephalogram detection electrodes according to claim 1 or claim 2, and 7 denotes a detachable frame on the head, which indicates that the electroencephalogram detection electrodes are arranged. In this embodiment, the head is fixed to the head in a headband shape, but a method of sandwiching the head with a hard frame 7 or a method of fixing the frame 7 in a hat shape or a ring shape to the head may be used.

  The present invention is used in the following manner with the above configuration. The user 8 first confirms that the electrolytic solution is present in the liquid storage chamber 3, and injects it when there is not. The electrolyte reaches the exposed portion of the scalp contact portion 2 through the water-absorbing material 5 by capillary action. After confirming this, the user 8 wears a headset type electroencephalogram measuring apparatus on the head. At that time, the frame 7 is arranged on the occipital side so that the tip of the scalp contact portion 2 contacts the scalp of the occipital region. Since the scalp contact portion 2 has a hook shape and a thin plate shape, the scalp contact portion 2 can reach the scalp through the scalp regardless of the shape of the user's hairstyle. In addition, the electrolyte supplied through the water-absorbing material 5 sandwiched between the two thin plates 4 wets only the scalp where the electrode contacts without contaminating the surrounding scalp and scalp before and after the contact between the electrode and the scalp. Bring stability. By wearing the product of the present invention in this way, the electroencephalogram detection electrode can be in direct contact with the scalp of the user 8 without being blocked by the hair, and the electrolyte can be supplied to the scalp without contaminating the hair. FIG. 11 is a side view showing an embodiment of the present invention, and shows a state in which the user 8 wears the product of the present invention as described above.

  Next, the electroencephalogram detection is performed by connecting the electroencephalogram detection electrode according to the present invention and other electrodes arranged directly to the user 8 to an electroencephalograph.

  In the present embodiment, the brain waves including alpha waves generated from the back of the head can be measured in order to make the user 8 listen to music and confirm the psychological effect.

  Examples of the present invention will be described in detail below. Normally, when electroencephalogram measurement is performed at a medical institution or the like, a dish-shaped silver-silver chloride electrode having a diameter of about 10 mm is placed on a subject's head at 21 locations based on the international standard 10-20 method. A method is adopted in which one or two of the 21 locations are selected as reference electrodes, and the potential difference between the reference electrode and the other electrodes is measured with an electroencephalograph connected to the electrodes. .

  In this method, it takes a very long time to attach the electrodes, and the hair becomes dirty due to the use of a large amount of conductive paste. Therefore, this method is very inconvenient for a system that easily measures brain waves. It was.

  Therefore, in order to realize a method for performing electroencephalogram measurement without using a conductive paste, a headband in which the two plate-shaped electrodes are arranged in contact with two points on the forehead is created, and this is applied to the head. An electroencephalogram was measured by wearing it. The reason why the electrode is placed on the forehead is that there is no hair and the electrode can directly contact the scalp. However, the alpha wave that is always generated when the eyes are closed could not be detected.

  Therefore, a plate electrode was affixed near the base of the ear with a conductive paste, and another plate electrode was affixed to the area where the hair on the back of the head was scraped, and brain waves were measured. I was able to catch it. This indicates that alpha waves are generated from the occipital region and hardly occur in the frontal region. As a result, there arises a problem of how the electrode can be brought into contact with the scalp of the occipital region having the hair without contaminating the hair with the conductive paste and without disturbing the hair.

  Therefore, 16 sterling silver round bars 1mm in diameter and 10mm in length are arranged in sword-mount on a printed circuit board in 4 rows, 4 rows, and 1 inch intervals, and are soldered on the plus side of the 9V battery. By connecting a pure silver round bar to the negative side and immersing both in saline, a silver chloride film was formed on 16 positive silver round bars, and this was used as an electrode. Make two of the electrodes, place them on the Velcro headband so that one is in the vicinity of the base of the ear and the other is in contact with the back of the head. When the brain waves were measured, the alpha waves could be detected clearly. In addition, in order to prevent pain when wearing the sword-shaped electrode, the tip of a sterling silver round bar was flattened to flatten the contact surface between the electrode and the scalp, and the edge of the tip surface was further shaved.

  However, when an experiment was performed on a large number of subjects using the sword-shaped electrode, it was found that the hair could enter between the electrode and the scalp depending on the thinness and hair style of the subject. In this case, in order to directly contact the electrode and the scalp, it is necessary to apply a method of pressing the electrode more strongly while moving the electrode in small increments, or a method of reattaching the electrode with the scalp being scraped, both of which are inconvenient. It was. From this fact, it has been found that in order for a large number of users to wear the sword-shaped electrode without feeling inconvenience, the thickness of the pure silver round bar constituting the electrode is too thick when the diameter is 1 mm or more.

  Then, when the thickness of the sterling silver round bar was changed to 0.6 mm and an electrode similar to that described above was created and tested, there was considerable pain when worn even though the tip was flattened. The cause was that the contact area between the electrode and the scalp was narrowed. Especially when the attached electrode body was tilted even a little, the contact pressure was supported by a very small contact area, which caused considerable pain.

  Therefore, nine sterling silver round bars with a diameter of 0.5 mm and a length of 28 mm, curved in an inverted U shape, are arranged in 3 rows at 1 inch intervals and 3 rows at 2 inch intervals in all directions. Are arranged on a printed circuit board, a silver chloride film is formed by the same method as described above, and two electrodes are arranged on the headband as described above, and the same experiment is performed. EEG was detected. This is because the thin U-shaped members with a thickness of 0.5 mm are arranged in the same direction, and the contact surface of the above-mentioned sword mountain electrode is a point. On the other hand, if the inverted U-shaped member is used, the contact surface can be made a line, so that the contact area can be increased, and even when the electrode body is tilted back and forth and left and right, the contact remains round, and the electrode is on the scalp. It turned out to be because there was no piercing. However, this time, it was found that due to the thinness of the inverted U-shaped metal member made of a pure silver round bar having a diameter of 0.5 mm, the member would bend when the headband was repeatedly attached and detached.

  Therefore, nine sterling silver round bars with a diameter of 1 mm and a length of 28 mm were bent into an inverted U shape, and the curved portion at the tip was crushed with a hammer into a horseshoe shape and made into a substantially plate shape with a thickness of 0.5 mm. Arranged on a printed circuit board in the same manner as described above, a silver chloride film was formed by the same method as described above, and two electrodes were placed in the headband as described above. The brain waves could be detected almost without any bending of the members. As a result, it was found that even a silver, which is a soft metal, can withstand the contact pressure during measurement if the leg portion has a diameter of 1 mm or more. It was also found that the four U-shaped members arranged at the four corners of the square base plate are difficult to tilt when mounted.

  Further, when the same experiment was performed with the thickness of the curved portion at the tip of the inverted U-shaped member increased by 0.5 mm to 0.1 mm, the thickness of about 0.8 mm was required for easy contact between the electrode and the scalp. Was found to be the limit. In addition, when the same experiment was conducted by reducing the thickness of the sterling silver round bar constituting the inverted U-shaped member by 1 mm to 0.1 mm in diameter, the member was not bent when mounting the electrode. It turns out that the diameter is about 0.8mm. Therefore, as a configuration of an electroencephalogram detection electrode that is highly reliable and easy to manufacture, a pure silver round bar having a diameter of 0.8 mm or more is bent into a U shape, and the curved portion is formed into a substantially plate shape of 0.8 mm or less. It turned out to be best to consist of crushed material.

  However, in the method of detecting an electroencephalogram without using any conductive paste by using the inverted U-shaped member, it is necessary that the electrode and the scalp are in close contact with each other. When the user wears the electrode loosely, the adhesion between the electrode and the scalp is weakened, and noise is mixed. This is because the resistance value between the electrode and the scalp fluctuates or the electric charge accumulates between the electrode and the scalp due to the wobbling of the electrode on the scalp. In any case, it was necessary to verify at what rate these defects occurred.

  Therefore, an experiment was performed in which 38 subjects who were unfamiliar with the wearing had to wear the electrodes themselves, and the brain waves at that time were measured. First, the subject was asked to wear a Velcro head band on which electrodes composed of the inverted U-shaped member were placed, and then the electroencephalogram was measured for 10 seconds when the eyes were opened and 10 seconds when the eyes were closed. As a result, the brain waves of 12 subjects among the subjects were hardly mixed with noise, but the remaining 26 brain waves were mixed with noise. Therefore, we instructed 26 people who were found to be contaminated with noise to tighten the Velcro® headband again to make the electrodes tightly adhere to the extent that no noise was mixed. All subjects complained of pain. As a result of this experiment, there was a new problem of how to realize an electroencephalograph electrode capable of detecting an electroencephalogram without causing noise mixing and painless even when worn by an unfamiliar user. .

  Thus, when an electroencephalogram detection experiment was performed by using a thread wound around the inverted U-shaped member and immersing it in salt water as an electrode, it was found that even when the electrode was loosely worn, there was little mixing of noise. This is because the charge is not accumulated between the scalp and the electrode because the chloride ion (Cl-), which is a common ion of silver chloride (AgCl) and salt water (NaCl), of the electrode mediates charge transfer. This has been found to be an effect of an electrode having such a property, that is, an unpolarized electrode. However, in the method of winding a thread around the inverted U-shaped member, there is a need for improvement in that the salt water dries quickly and the hair becomes slightly dirty.

  Therefore, sandwiching the felt of approximately the same size with two pure silver plates 18mm long, 10mm wide and 0.3mm thick, fixing them with rivets, and then hitting them with a hammer to make the thickness approximately 0.8mm, The corner of the contact portion with the scalp was rounded with a file, and a silver chloride film formed by the same method as described above was used as the scalp contact portion of the electrode member. The reason for setting the thickness to about 0.8 mm is based on the above experimental results.

  An aluminum rivet was originally used as a rivet to hold the felt between two sterling silver plates and to fix them, but it was found that a silver chloride film could not be formed. This was because aluminum and silver chloride caused a chemical reaction. Therefore, when a 2 mm diameter and 1 mm diameter sterling silver round bar was used as a rivet, a silver chloride film could be formed, so four scalp contact portions were made by this method. This is for producing two electrodes each having two scalp contact portions.

  Next, two casings with a height of 30 mm, a width of 23 mm, and a depth of 15 mm are made of an acrylic plate, and two holes for inserting the above-mentioned scalp contact portions are provided on the front surface of the casing, and 2 holes for injecting salt water A space was opened on the back of the housing. Next, the above-mentioned scalp contact part was inserted into the two cuts, and further, the gap between the scalp contact part and the insertion port was sealed with an adhesive to prevent leakage of salt water from the insertion port. Next, a lead wire is connected to the pure silver plate of the scalp contact portion, and then salt water is injected from the hole on the back surface of the housing using a syringe, and then these two electrodes are connected to the 2 of the Velcro head band. Placed in place.

  When an electroencephalogram was detected using the electrodes prepared as described above, even when the electrodes were loosely worn, there was almost no noise and the salt water did not dry out. However, in this method, salt water oozes out through the felt, and it was found that the hair and the surrounding scalp get dirty. This is because the position of the scalp contact part exposed outside the housing is below the position of the salt water level, so the salt water is reduced by leaching and the scalp contact part where the salt water level is exposed. It turns out that salt water continues to exude a lot until it is below the position.

  Therefore, the inside of the housing was partitioned into two parts, and only the lower part was used as a salt water storage chamber. In addition, by making the scalp contact part consisting of two silver chloride coated pure silver plates sandwiching the felt mentioned above into an inverted L shape, the part enclosed in the case is lengthened, and the liquid storage chamber at the bottom of the case is reached. To reach. That is, the liquid storage chamber is positioned below the scalp contact portion exposed outside the housing. As a result, the salt water in the liquid storage chamber is sucked up into the felt by capillary action and reaches the scalp contact portion exposed to the outside of the housing, but the excess salt water does not ooze out and the felt only retains water. By using an electrode composed of this structure, the scalp contact part with a thickness of approximately 0.8 mm passes through the hair and reaches the scalp, so that only the scalp in contact with the electrode is moderately moistened with salt water. I was able to. Moreover, since the thickness of the scalp contact portion was approximately 0.8 mm, the scalp contact portion was not bent at all as in the above experimental results.

  Using this as an electrode, the same experiment as described above was performed on 23 out of 26 people who were found to be mixed with noise and 15 new subjects in the previous experiment. As a result, almost all of the subjects' brain waves were mixed with noise. None of the subjects complained of wearing or complaining of wearing pain. As a result, it was possible to realize an electroencephalogram detection electrode in which noise does not mix even when worn loosely, the salt water does not dry, and the hair is not soiled by the salt water.

  In the past, salt water was injected with a syringe through a hole in the housing. To save this trouble, the liquid storage chamber was separated from the housing, and the cartridge type was used. That is, the cartridge-type liquid storage chamber has a shape into which the scalp contact portion on the housing side can be inserted, and the insertion port is made of rubber in order to seal salt water leakage. This facilitated the replenishment of salt water, and at the same time, it was possible to prevent contamination with a large amount of salt when the electrode was dried.

  In addition, when an experiment was conducted to change the thickness of the scalp contact portion, in this method, if the thickness of the tip portion of the scalp contact portion that directly contacts the scalp is 2.0 mm or less, noise is mixed in the same manner as described above. It was possible to detect brain waves without accompanying it. It was found that even if some scalp hair was inserted between the electrode and the scalp, the salt water brought about the effect of the aforementioned non-polarized electrode. Since the amount of salt water in this case is very small, which is supplied by utilizing the capillary phenomenon of felt, the dirt on the hair is hardly noticed. Further, it was found that when the joint portion with the casing is 0.3 mm or more, it does not bend when the scalp contact portion is mounted. This is because the reverse U-shaped member in the previous experiment used a sterling silver round bar, but this time the strength increased due to the use of a sterling silver plate, and even if it was not attached strongly, the noise It was found that EEG detection was possible without any contamination.

  On the other hand, when the material of the two plates sandwiching the felt is changed from a pure silver plate with a silver chloride film to a lead plate with a lead chloride film, or the material of the plate is left as it is. When the liquid to be injected is changed from salt water to potassium chloride aqueous solution, or when the plate material is changed to resin, and a pure silver conductor with a silver chloride film formed on the felt sandwiched between the two plates is connected In addition, the experiment was also conducted in the case where the plate material was changed to resin, a pure silver plate having a silver chloride film formed on the felt sandwiched between the two plates was brought into contact, and a conductive wire was connected to the pure silver plate. However, in both cases, the electroencephalogram could be detected without any noise mixing as described above. For this reason, the metal constituting the electrode may be a metal having ions in common with the electrolyte contained in the liquid storage chamber, and the metal does not contact the scalp directly, even if the metal is not in direct contact with the scalp. I knew that I should be in touch.

  Using the electrodes created as described above, an electroencephalogram detection experiment was performed for 80 people. For female subjects with hair in the back of the head and female subjects with perms, almost all of them were in the first stage. EEG detection was impossible. This is because the scalp contact part and the hair cross each other, so that a large amount of hair enters between the scalp contact part and the scalp. Therefore, in order to avoid this problem, it took time and effort to remove the hair style of the subject and have the hair lowered once, or to touch the scalp while moving the electrode in small steps. In this experiment, most of the female subjects had gathered hair, which caused a considerable amount of labor. Moreover, as a result of investigating the hairstyles of ordinary women after the experiment, it was found that a large number of women's hairstyles were gathered hair, and it was found that the solution of this problem was essential.

  In order to solve the above problems, we conducted experiments on women with hair on the back of the head after changing the shape of the scalp contact part to a corrugated or comb shape. Accompanied.

  However, when a thin metal rod with a diameter of about 1 mm is inserted into the scalp and pressed so that the side of the metal bar contacts the scalp, the side of the metal bar and the scalp can be contacted regardless of the shape of the hair. It was.

Accordingly, the scalp contact portion of the electroencephalogram detection electrode prepared in the same manner as described above is changed to a hook shape, and the tip portion of the hook shape and the portion having an outer edge that directly hits the scalp are narrower than 4 mm. An experiment was conducted on a woman who had a rod-like shape and bundled hair at the back of her head. The scalp hair in the case of the collective hair intersects the scalp contact part, but if the scalp contact part is a hook shape, the scalp can reach the scalp so that the sharp tip of the hook shape sews the gap between the intersected hairs It was found that the pain of wearing can be eliminated by changing the angle at which the scalp contact part is pressed after the hook-shaped tip part reaches the scalp and bringing the hook-shaped outer edge part into contact with the scalp. . As a result of this experiment, it was found that if the scalp contact part is hook-shaped, no noise is mixed regardless of the shape of the subject's hair, and correct measurement is possible without any pain at the time of wearing.

1 is a perspective view of an electroencephalogram detection electrode according to an embodiment of the present invention. It is a side view of the electrode for electroencephalogram detection concerning the embodiment of the present invention. It is a top view of the electrode for electroencephalogram detection concerning the embodiment of the present invention. It is a front view of the electrode for electroencephalogram detection concerning the embodiment of the present invention. It is a partial perspective view of the electroencephalogram detection electrode showing the internal structure of the present invention. It is side surface sectional drawing of the electrode for electroencephalogram detection which shows the internal structure of this invention. It is a top surface sectional view of the electrode for electroencephalogram detection which shows the internal structure of the present invention. It is front sectional drawing of the electrode for electroencephalogram detection which shows the internal structure of this invention. It is a perspective view which shows the structure of the scalp contact part 2 of the electrode for electroencephalogram detection which concerns on embodiment of this invention. 1 is a perspective view of a headset type electroencephalogram measurement apparatus according to an embodiment of the present invention. It is a side view which shows the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Scalp contact part 3 Liquid storage chamber 4 Thin plate 5 Water absorbing material 6 Metal conductor 7 Frame 8 User

Claims (2)

An electroencephalogram detection electrode comprising a main body 1 and a plurality of scalp contact portions 2 formed integrally with or fixed to the main body 1, wherein the scalp contact portion 2 has a hook shape. A main body 1 having a liquid storage chamber 3 having an electrolytic solution therein, a plurality of scalp contact portions 2 composed of two thin plates 4 and a water absorbent material 5 sandwiched between the two thin plates 4, and the thin plate 4 Alternatively, it comprises a metal conductor 6 connected to the water-absorbing material 5, the scalp contact portion 2 is at least partially contained in the liquid storage chamber 3, and at least another part is exposed to the outside of the main body 1, 2. The electroencephalogram detection electrode according to claim 1, wherein the scalp contact portion 2 exposed to the outside of the main body 1 has a hook shape.

Images