JP6354969B1 - Electroencephalogram detection electrode - Google Patents

Abstract

In an electroencephalogram measurement, an electrode can be arranged without contaminating a user's hair with a conductive paste or the like, noise is less mixed, and the impedance between the electrode and the contact surface can be arbitrarily reduced, and in daily life. Provided is an electrode for detecting an electroencephalogram that can be worn without a sense of incongruity. SOLUTION: A plurality of bendable rods 2 around which fibers 1 are wound, a tube 2 into which a rod 2 and a conducting wire 3 extending from a substantially leading end of the rod 2 are inserted, a tube 4 and the conducting wire 3 is fixed to the base plate 5 through which the rod 2 penetrates, the main body case 6 is fixed to the base plate 5 and formed with spiral unevenness, and the cap 7 is provided with unevenness so as to mesh with the unevenness of the body case 6 And the fiber 1 is exposed from the tube 4. [Selection] Figure 1

Description

  The present invention relates to an electroencephalogram detection electrode.

  Conventionally, as an electrode mounting method in electroencephalogram measurement, there are a method of fixing an electrode on the scalp with an adhesive tape, a method of using a rubber head band to hold the electrode in a predetermined position, and a plurality of electrodes. There is a method of covering a dedicated head cap arranged. These methods are troublesome to wear, and are accompanied by disturbance of the hair when attaching and detaching. Moreover, since these require an electrically conductive paste when the electrode is brought into contact with the scalp having scalp hair, the hair must be soiled. In addition, it is unsuitable for measurement during daily life because the appearance is uncomfortable.

  As a method for solving these problems, a method using a headset in which one or a plurality of electrodes are arranged so as to come into contact with the user's forehead, or glasses are proposed in Japanese Unexamined Patent Publication No. 2000-014787. There are ways to do this. These are systems in which the electrode is brought into contact with the frontal region without hair, so that the hair is not soiled by the conductive paste or the like, and the hair is not disturbed during attachment / detachment. However, because there are muscles in the forehead, myoelectric noise is mixed, and alpha waves that are the measurement target in many electroencephalogram measurements are generated from the occipital region, so they are placed only in the forehead like these It is impossible to perform correct measurement with electrodes.

  On the other hand, as a method for performing electroencephalogram measurement using electrodes arranged in the ear canal, JP 2011-217986A covers the surface of an elastic body that deforms in accordance with the shape of the ear canal and inserts the elastic body into the ear hole. A method for detecting an electroencephalogram by bringing an electrode into contact with the inner peripheral surface of the ear canal has been proposed. However, since the elastic body cannot control the expansion inside the ear canal, it is difficult to arbitrarily reduce the impedance between the electrode and the contact surface.

JP 2000-014787 A, JP 2011-217986 A

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  The present invention has been made in view of the above circumstances, and the problem to be solved is that the electroencephalogram measurement does not contaminate the user's hair with a conductive paste or the like, the electrode can be arranged, and there is little mixing of noise, Moreover, it is possible to realize an electrode for detecting an electroencephalogram that can arbitrarily reduce the impedance between the electrode and the contact surface, and can be worn without a sense of incongruity in daily life.

    The present invention has been made to solve the above-described problems. The invention according to claim 1 includes a plurality of bendable bars 2 around which fibers 1 are wound, and the bars 2 and the bars. 2, a tube 4 into which a conducting wire 3 extending from a substantially distal end is inserted, a base plate 5 through which the tube 4 and the conducting wire 3 are fixed and the bar 2 penetrates, and a helical plate fixed to the base plate 5. A brain wave detection characterized by comprising a main body case 6 having an uneven surface and a cap 7 having an uneven surface so as to mesh with the uneven surface of the main body case 6, wherein the fiber 1 is exposed from the tube 4. Electrode.

  In electroencephalogram measurement, the electrode can be placed without contaminating the user's hair with conductive paste, etc., with less noise mixing, and the impedance between the electrode and the contact surface can be reduced arbitrarily, and it can be worn comfortably in daily life. A possible electroencephalogram detection electrode was realized.

  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 sectional drawing of the state in which the front-end | tip of the electrode for electroencephalogram detection which concerns on embodiment of this invention was closed.   It is sectional drawing in the state where the front-end | tip of the electrode for electroencephalogram detection which concerns on embodiment of this invention opened.   It is a figure of the state where the electrode for electroencephalogram detection concerning an embodiment of the present invention was inserted in the ear canal, and the tip was closed.   It is a figure of the state which inserted the electroencephalogram detection electrode which concerns on embodiment of this invention in the ear canal, and the front-end | tip opened.

  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. 1 indicates a fiber. Reference numeral 2 denotes a plurality of bendable bars around which the fiber 1 is wound, and 3 denotes a conductive wire extending from a substantially tip end of the bar 2. Reference numeral 4 denotes a cylinder into which the conducting wire 3 and the rod 2 are inserted, and reference numeral 5 denotes a base plate to which the cylinder and the conducting wire 3 are fixed and the rod 2 penetrates. Reference numeral 6 denotes a main body case fixed to the base plate 5 and formed with spiral irregularities. Reference numeral 7 denotes a cap having irregularities formed so as to mesh with the irregularities of the main body case 6. FIG. 2 is a side view. FIG. 3 is a cross-sectional view of the electroencephalogram detection electrode according to the embodiment of the present invention with the tip closed, and FIG. 4 is a cross-sectional view with the tip closed.

  As shown in these figures, the product of the present invention is characterized by the following operations. When the cap 7 is rotated, the cap 7 meshed with the spiral irregularities of the main body case 6 pushes the plurality of bars 2 in the direction of the fiber 1, but the conductive wire 3 extending from substantially the tip of the bar 2 and fixed to the base plate 5 is a fiber. A force acts to prevent the rod 2 from moving in one direction and bend the plurality of rods 2 radially. However, since the rod 2 is housed in the cylinder 4, the only portion that expands radially is the tip portion of the rod 2. The user can arbitrarily control the spread of the tip portion of the rod 2 by the number of rotations of the cap 7.

  The present invention is used in the following manner with the above configuration. First, the user immerses the fiber 1 in an electrolyte solution such as salt water, and inserts the tube 4 in which the fiber 1 is exposed into the ear canal. When the cap 7 is turned when the fiber 1 reaches the inside of the ear canal, the tips of the plurality of rods 2 around which the fiber 1 is wound spread radially and project inside the ear canal. FIG. 5 is a diagram showing a state in which the electroencephalogram detection electrode according to the embodiment of the present invention is inserted into the ear canal and the tip is closed, and FIG. 6 is a diagram showing a state in which the tip is opened.

  Thus, by mounting the product of the present invention, the impedance of the contact surface between the electrode and the outer ear can be arbitrarily reduced, and noise can be attenuated.

  In this embodiment, as a method of holding the product of the present invention on the ear, a method using only the force of sticking out the tip of the bar 2, a method of fixing with an adhesive tape, a method of attaching the product of the present invention to a headband, etc. are effective.

  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 electrode, and the hair becomes dirty with the conductive paste, which is inconvenient when simply measuring brain waves, and the appearance is uncomfortable when worn. Therefore, it was unsuitable for measurement during daily life.

  Therefore, in order to realize a method of measuring the electroencephalogram from the ear canal using an electroencephalograph electrode, a pure silver wire (diameter: 0.3 mm) is wound around the swimming earplug in the vertical direction, that is, the insertion direction into the ear, and the pure silver wire After a silver chloride film was formed on the wire, a conductive paste was applied to this wire, and then inserted into the ear canal and the brain wave was measured. The brain wave signal could be detected well with some pain.

  However, when the electroencephalogram was measured several times using the electrodes described above, there was a variation in the noise mixture, and even when multiple subjects were measured, there was also a variation in the noise mixture. When the contact impedance between the walls was measured, it was found that the contact impedance changed with each measurement or with the subject. This caused a problem that a mechanism capable of freely controlling the contact impedance was required.

  Therefore, four bundles of the extremely small binding bands cut off from the annular part are bonded together leaving only the tips, and pure silver wires (diameter 0.3 mm) are tied to each tip and suspended, and the bundles of binding bands are put into pure silver wires. Insert each into a straw, expose only the tip, insert into the universal board with a hole on the opposite side of the tip, and solder four sterling silver wires to a universal board with an appropriate length and solder the straw to the universal board Attach the neck portion of the PET bottle to the opposite side of the universal substrate from which the straw is fixed, and the binding band on the side inserted into the hole of the universal substrate, that is, the binding band ridge is the lid of the PET bottle. Prototype A was created so as to be in contact with the back side of.

  When the lid of the prototype A plastic bottle is turned, the binding band ridge is pushed, and the binding band tip on the opposite side tries to protrude from the straw. As a result of the blocking, the binding band tip opens radially.

  Wire the pure silver wire soldered to the universal substrate of this prototype A and an electroencephalograph, and form a silver chloride film on the opposite side of the pure silver wire, that is, the end of the binding band, and apply the conductive paste Then, when the brain wave was measured by inserting it into the ear hole and turning the lid of the pet bot as described above, the contact impedance could be lowered arbitrarily and the brain wave signal could be detected well. There was considerable pain.

  Therefore, a felt is wound around the tip of the binding band, and the felt and the binding band tip are stitched together with a pure silver wire (diameter 0.3 mm) to create a prototype B having the same mechanism as described above, without using a conductive paste. When brain waves were measured in the same manner as described above by soaking salt water in, the contact impedance could be arbitrarily reduced without causing pain in the ear canal, and the brain wave signals could be detected well.

  Prototype B uses four cable ties, so when you turn the lid of the plastic bottle, the tip of the cable tie sticks out in 4 directions and you can hold it in your ears only with the tension. Because of the difference, Prototype B may not be heard.

  Therefore, when the number of cable ties was reduced from 4 to 2 and a prototype C having the same mechanism as described above was created and brain waves were measured in the same manner as described above, insertion into a small ear hole became possible. Prototype C was tilted by its own weight, and as a result, gravity was concentrated only in one direction at the tip of the binding band, and the ear canal was considerably painful.

  Therefore, a slit is made in the curing tape, the prototype C is pasted with the curing tape so as to be sandwiched between the slits, the prototype C is inserted into the subject's ear, and the remaining portion of the curing tape is then applied to the subject's cheek and head. By holding the prototype C on the ear by pasting it on the part and measuring the same EEG as before, the contact impedance can be arbitrarily reduced without pain in the ear canal, and the EEG signal can be detected well. I was able to. In addition, even when the prototype C was attached to the headband type headphones, the measurement was similarly good.

DESCRIPTION OF SYMBOLS 1 Fiber 2 Rod 3 Conductor 4 Tube 5 Base plate 6 Main body case 7 Cap 8 External auditory canal

Claims (1)

A plurality of bendable rods 2 in which the fiber 1 is wound around one end, and the side of the rod 2 where the fiber 1 is not wound and the side of the rod 2 where the fiber 1 is wound. A tube 4 into which a conducting wire 3 extending from the tip is inserted, a base plate 5 to which the tube 4 and the conducting wire 3 are fixed and the rod 2 penetrates, and a spiral unevenness that is fixed to the base plate 5 are provided. The main body case 6 is formed, and the cap 7 is formed with projections and depressions so as to mesh with the projections and depressions of the main body case 6, and the tip of the rod 2 on the side where the fibers 1 are not wound is attached to the main body case 6. An electroencephalogram detection electrode, characterized in that it penetrates and contacts the inner bottom surface of the cap (7), and the fiber (1) is exposed from the tube (4).

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