JP2019126652A - Bioelectrode for brain wave detection - Google Patents

Abstract

To provide a bioelectrode for brain wave detection capable of improving adhesiveness, and preventing generation of noise of an electric signal transmitted as a detected brain wave.SOLUTION: In a bioelectrode 1 for brain wave detection, an electrode part 20 includes a contact recess 25 recessed toward the inside of respective protrusions 22. The contact recess 25 is formed so that a contact protrusion 34 which is a protruding part whose surface is formed of metal material of a connection object member 30 is press-fitted, and in a state that the protrusion 22 of the electrode part 20 is penetrating through a through-hole 11 of a holder part 10, the contact recess 25 is arranged so as to accommodate the respective contact protrusions 34 of the connection object member 30.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an electroencephalogram detection biological electrode, and more particularly, to an electroencephalogram detection biological electrode for detecting an electroencephalogram in contact with a subject's scalp.

  Heretofore, a brain electrode for detecting an electroencephalogram has been used, for example, for detection of an electroencephalogram signal for analysis of a brain functional state for the purpose of early detection of Alzheimer's disease and the like. The electroencephalogram detection biological electrode is used by bringing the electrode portion into direct contact with the subject's scalp for detection of an electroencephalogram signal. The electrode part of a conventional bioelectric wave detection biological electrode is one in which a metal electrode member is covered with an elastic member containing an electrolytic solution, or one in which a metal electrode member having a pointed tip is covered with an elastic member (For example, refer to Patent Document 1).

JP 2006-34429 A

  In such a conventional bioelectric electrode for detecting an electroencephalogram, the electrode member is made of metal and has low adhesion to the scalp. For this reason, the structure which can improve adhesiveness was calculated | required with respect to the bioelectrode for a conventional electroencephalogram detection. In the conventional electroencephalogram-detecting bioelectrode, the detected electroencephalogram is transmitted as an electrical signal to the signal analysis device. Conventionally, there has been a demand for a configuration in which noise is not generated in the transmitted electrical signal.

  The present invention has been made in view of the above-described problems, and an object thereof is an electroencephalogram capable of improving the adhesion and preventing the generation of noise of an electric signal transmitted as a detected electroencephalogram. The object is to provide a bioelectrode for detection.

  In order to achieve the above object, the electroencephalogram detection biological electrode according to the present invention includes a housing recess recessed from one side for housing a connection target member, and a plurality of through holes penetrating from the housing recess to the other side. And at least one conductive elastic body having a holder part, a base part extending to the outer peripheral side of the peripheral surface of the through hole, and at least one protrusion part that can penetrate the through hole protruding from the base part. And the electrode portion has a contact recess which is recessed toward the inside of each of the protrusions, and the surface of the connection target member of the contact recess is formed of a metal material. The contact recess, which is a projecting portion, is formed so as to be press-fit, and the contact recess is the connection target member in a state where the protrusion of the electrode portion penetrates the through hole of the holder portion. The contact bump Parts, characterized in that are respectively capable of accommodating placing.

  In the biological electrode for electroencephalogram detection according to one aspect of the present invention, the holder portion has a holding member which is an annular member formed of an elastic body, and the holding member is the housing recess in the housing recess. A portion on the inner peripheral side of the holding member is positioned in the accommodating recess so as to be compressed between the inner surface of the member and the outer surface of the connection target member.

  In the biological electrode for brain wave detection according to one aspect of the present invention, the holding member is an O-ring.

  In the electroencephalogram-detecting bioelectrode according to one aspect of the present invention, a guide portion that defines a housing direction of the connection target member is formed on the inner surface of the housing recess.

  The living body electrode for electroencephalogram detection according to one aspect of the present invention includes one of the electrode portions, and the electrode portion includes a plurality of the protruding portions provided for each of the plurality of through holes. .

  In the biological electrode for brain wave detection according to one aspect of the present invention, the electrode unit is provided for each of the plurality of through holes, and each of the electrode units has one protrusion.

  According to the living body electrode for brain wave detection relating to the present invention, the adhesion can be improved, and the generation of noise of the electric signal transmitted as the detected brain wave can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows roughly the structure of the biological electrode for brain-wave detection which concerns on embodiment of this invention. It is a side view showing roughly the composition of the living body electrode for brain wave detection concerning an embodiment of the invention. It is sectional drawing in the AA cross section shown in FIG. 2 of the biological electrode for brain wave detection which concerns on embodiment of this invention. It is sectional drawing in the AA cross section shown in FIG. 2 of the modification of the biological electrode for brain wave detection which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view schematically showing a configuration of a brain wave detecting biological electrode 1 according to an embodiment of the present invention, and FIG. 2 is a side view schematically showing a configuration of the brain wave detecting biological electrode 1. is there. Moreover, FIG. 3 is sectional drawing in the AA cross section shown in FIG. 2 of the biological electrode 1 for brain-wave detection. As shown in FIGS. 1 to 3, the brain wave detecting biological electrode 1 according to the embodiment of the present invention includes a housing recess 12 recessed from one side for housing the connection target member 30 and the other side from the housing recess 12. A holder portion 10 having a plurality of through holes 11 passing through the base portion 21, a base portion 21 extending outward from the circumferential surface of the through hole 11 and at least one protrusion capable of penetrating the through hole 11 protruding from the base portion 21 And an electrode portion 20 formed of at least one conductive elastic body having a portion 22, and the electrode portion 20 has a contact recess 25 recessed toward the inside of each of the protrusions 22, and the contact recess A contact protrusion 34 is formed so as to be press-fit so that the surface of the connection target member 30 is a protruding portion formed of a metal material. The protrusion 22 of the electrode portion 20 is a through hole 11 of the holder 10. Penetrates In state, the contact recess 25 has a contact protruding part 34 of the connection object member 30 are respectively capable of accommodating arrangement. Hereinafter, the configuration of the electroencephalogram detection biological electrode 1 will be specifically described.

  The electroencephalogram-detecting bioelectrode 1 is used by being connected to a signal analyzer, and the protruding portion 22 of the electrode unit 20 contacts the subject's scalp to detect an electroencephalogram. The detected electroencephalogram is transmitted as an electrical signal to the signal analyzer through the electrode unit 20 and the connection target member 30. Thereby, the brain wave of the subject is analyzed in the signal analysis device.

  As shown in FIGS. 1 to 3, the holder portion 10 is a cylindrical member with a bottom or a substantially cylindrical member with a bottom, and is a recess having a predetermined depth and formed so as to be able to receive the connection target member 30. A recess 12 is formed. Specifically, the holder portion 10 includes a disc-like or substantially disc-like disc portion 13, and a cylindrical or substantially cylindrical cylindrical portion 14 erected from an opposing surface 13 a that is one surface of the disc portion 13. It has. For example, as shown in FIG. 3, the cylindrical portion 14 is formed at the outer edge of the disk portion 13. The disposition position of the cylindrical portion 14 in the holder portion 10 is not limited to this, and the cylindrical portion 14 may be formed on the inner peripheral side of the outer edge of the disk portion 13 in the holder portion 10. In the holder portion 10, the disk portion 13 and the cylindrical portion 14 are integrally formed. The holder portion 10 is formed of, for example, an insulator made of an elastic material such as hard resin or rubber.

  As shown in FIGS. 1 to 3, in the holder portion 10, the disk portion 13 has a plurality of through holes 11 penetrating the disk portion 13 between the opposing surface 13 a and the outer surface 13 b opposite to the opposite surface 13 a. Is provided. The plurality of through holes 11 are each formed in a cylindrical or substantially cylindrical shape. For example, a plurality of (for example, three) through holes 11 are provided at equal angular intervals or substantially equal angular intervals on the same or substantially the same radius from the center or approximately the center of the disk portion 13. In addition, the number and the arrangement position of the through holes 11 in the disk part 13 are not restricted to this, and the disk part 13 should just have the through holes 11 in arbitrary numbers and positions.

  Further, the holder portion 10 has a holding member 16 which is an annular member formed of an elastic body, and the holding member 16 is an inner surface of the housing recess 12 and an outer surface of the connection target member 30 in the housing recess 12. The inner circumferential portion of the holding member 16 is positioned within the receiving recess 12 so as to be compressed therebetween. The holding member 16 is formed of, for example, an elastic member such as rubber or resin, is circular in cross section or substantially circular in cross section, and is an annular or substantially annular O ring. The holding member 16 may be provided so that the connection target member 30 can be fitted into the storage recess 12 by pressing the connection target member 30 in the storage recess 12, for example, the holder portion 10 described later. It is attached to the annular groove 15.

  In the holder portion 10, an annular groove 15 is formed on the inner peripheral surface 14 a of the cylindrical portion 14. Specifically, the annular groove 15 is an annular or substantially annular groove having a predetermined depth from the inner peripheral surface 14a of the cylindrical portion 14 toward the outer peripheral surface 14c. Further, the width of the annular groove 15 (the dimension in the extension direction of the cylindrical portion 14) is larger than the thickness of the holding member 16 (the dimension in the axial direction). The annular groove 15 is formed on, for example, an annular or substantially annular end face 14 b side which is a tip portion of the cylindrical portion 14. Further, the depth of the annular groove 15 (the dimension in the radial direction of the cylindrical portion 14) is smaller than the width (the dimension in the radial direction) of the holding member 16. Therefore, a part of the holding member 16 on the outer peripheral side is accommodated in the annular groove 15, and a part on the inner peripheral side protrudes from the annular groove 15 toward the center of the cylindrical portion 14. It has become.

  Further, on the inner surface of the housing recess 12, a guide portion 17 which defines the housing direction of the connection target member 30 is formed. Specifically, the guide portion 17 is an annular or substantially annular member, and the edge on the outer circumferential side is in contact with the bottom 15 a of the annular groove 15, and the edge on the inner circumferential side is inside The connection target member 30 can be inserted into the connector. Further, the guide portion 17 is provided with a guide protrusion 17a which protrudes from the inner peripheral edge toward the center. The guide portion 17 is adapted to engage with a guide groove 32 (described later) of the connection target member 30 when the electroencephalogram detection biological electrode 1 is in use. The guide portion 17 is accommodated in the annular groove 15 and pressed against the end face 14 b side surface of the cylindrical portion 14 in the annular groove 15 by the holding member 16 so as to be fixed in the annular groove 15. The holder portion 10 may not have the guide portion 17, and the guide protrusion portion 17 a may be provided on the inner surface of the accommodation recess 12. Moreover, multiple guide protrusion parts 17a may be provided.

  The electroencephalogram detection biological electrode 1 has one electrode unit 20, and the electrode unit 20 includes a base 21, a plurality of protrusions 22 provided for each of a plurality of through holes 11, and a plurality of protrusions 22. And a contact recess 25 recessed toward the inside of each other. That is, the electroencephalogram detection biological electrode 1 has one electrode unit 20 having one base 21 and a plurality of protrusions 22. In the electrode portion 20, the base portion 21 and the projecting portion 22 are integrally formed.

  The electrode unit 20 is formed of, for example, a conductive elastic body. The conductive elastic body is formed of, for example, an elastic body in which a conductive powder material is mixed. The elastic body is, for example, a polymer material such as silicone resin. Further, as the conductive powder material, for example, graphite, carbon nanotubes, metal particles such as silver fine particles, AgCl particles, etc. are used. The material of the electrode unit 20 is not limited to this, and the conductive elastic body may be formed of, for example, a polymer material impregnated with an organic conductive polymer or an ionic liquid.

  In the electrode portion 20, the base portion 21 is formed in a disk shape or a substantially disk shape. The base portion 21 is housed in the cylindrical portion 14, and the diameter of the base portion 21 is, for example, the same as or substantially the same as the diameter of the inner peripheral surface 14 a of the cylindrical portion 14. Further, the value of the thickness (the dimension in the extending direction of the protrusion 22) of the base 21 is smaller than the value of the depth (the dimension in the extending direction of the through hole 11) of the cylindrical portion 14 of the holder 10 .

  In the electrode part 20, the protruding part 22 is arranged on the base part 21 so as to have a relative positional relationship similar to the relative positional relation of the through hole 11 in the disk part 13. The length of the protrusion 22 in the extension direction is longer than the length of the through hole 11 of the disk 13 in the extension direction, and the through surface 11 a of the disk 13 passes through the through hole 11 of the disk 13. It protrudes from the outer side surface 13b facing away. The projecting portion 22 includes a projecting portion main body portion 23 that is a columnar or substantially cylindrical portion extending from a back surface 21b that is a surface facing the opposite surface 21a that is one surface of the base portion 21, and a conical or And a brush portion 24 which is a substantially conical portion. The diameter of the projecting portion main body portion 23 is the same as or substantially the same as the diameter of the through hole 11 of the disk portion 13, and the projecting portion main body portion 23 can penetrate the through hole 11. It is preferable that the length in the extending direction of the protruding portion main body portion 23 be longer than the length in the extending direction of the through hole 11 of the disk portion 13. The brush portion 24 is connected to the tip of the protrusion main portion 23 and has a tapered shape whose diameter gradually decreases toward the tip. The brush portion 24 is a contact portion mainly in contact with the subject's scalp. The brush portion 24 preferably has a rounded tip.

  In the electrode portion 20, the contact recess 25 is a concave having a predetermined depth forming a cylindrical or substantially cylindrical space which is recessed inward in the extension direction of the protrusion 22 from the opposing surface 21a of the base 21. Part. For example, the depth in the extension direction of the contact recess 25 passes through the base 21 and reaches the protrusion main body 23 of the protrusion 22 but does not reach the brush 24 of the protrusion 22. In addition, the contact recess 25 has a tapered shape whose bottom surface gradually decreases in diameter toward the protrusion 22 side. The contact recess 25 is coaxial or substantially coaxial with the projection main body 23 of the projection 22, and the diameter of the contact recess 25 is smaller than that of the projection main body 23 of the projection 22. Furthermore, the diameter is smaller than the diameter of the contact protrusion 34 of the connection target member 30 described later, and the contact protrusion 34 is press-fit.

  The connection target member 30 includes a columnar or substantially columnar main body 31 and a guide groove 32 extending from the outer surface 31b facing the opposite surface 31a, which is a surface on one side of the main body 31, toward the opposite surface 31a. And a plurality of connection target member side contact recesses 33 provided for each contact recess 25 of the electrode part 20 and a columnar or substantially columnar contact protrusion 34.

  In the connection target member 30, the diameter of the main body portion 31 is the same or substantially the same diameter as the diameter of the inner peripheral surface 14 a of the cylindrical portion 14 of the holder portion 10 and the diameter of the base portion 21 of the electrode portion 20. Further, the length in the extending direction of the main body portion 31 is longer than the length in the extending direction of the inner peripheral surface 14 a of the cylindrical portion 14 of the holder portion 10. For this reason, a part of the main body 31 is accommodated in the cylindrical part 14, and a part of the main body 31 protrudes from the cylindrical part 14 in the extending direction. The outer surface 31 b of the main body 31 is attached with a lead wire connected to a signal analysis device (not shown).

  In the connection target member 30, the guide groove 32 is formed in a shape that can accommodate the guide protrusion 17 a of the guide portion 17 of the holder portion 10, and has a cross-sectional shape corresponding to the guide protrusion 17 a. The guide groove 32 reaches the facing surface 31 a and extends at the same depth or more than the depth at which the connection target member 30 is accommodated in the accommodation recess 12. The length of the guide groove 32 in the extending direction is, for example, the same or substantially the same length as the length of the main body 31 in the extending direction. The width of the guide groove 32 in the circumferential direction of the connection target member 30 is the same as or substantially the same as the width of the guide protrusion 17 a of the guide portion 17 in the circumferential direction. In the connection target member 30, the guide groove 32 includes a plurality of protrusions 22 of the electrode portion 20 when the guide protrusion 17 a is received in the guide groove 32 and the connection target member 30 is inserted into the storage recess 12. It is provided at a position that penetrates the through hole 11 or at a position where the contact protrusion 34 is inserted into the contact recess 25 of the electrode portion 20. When a plurality of guide protrusions 17 a of the guide part 17 are provided, the guide grooves 32 are formed in the number and position corresponding to the guide protrusions 17 a of the guide part 17.

  In the connection target member 30, the connection target member-side contact recess 33 is disposed on the facing surface 31 a of the main body 31 so as to have the same relative positional relationship as that of the contact recess 25 in the electrode unit 20. The connection target member side contact concave portion 33 is a concave shape having a predetermined depth forming a cylindrical or substantially cylindrical space which is recessed inward in the extension direction of the main body portion 31 from the opposing surface 31 a of the connection target member 30. Part.

  In the connection target member 30, the length of the contact protrusion 34 in the extension direction is longer than the depth of the connection target member-side contact recess 33, and a part thereof is accommodated in the connection target member-side contact recess 33. It is configured such that a portion protrudes outward from the connection target member side contact recess 33 in the extension direction thereof. Further, the diameter of the contact protrusion 34 is slightly larger on the outer peripheral side than the diameter of the connection target member-side contact recess 33, and the contact projection 34 is press-fit and held in the connection target member-side contact recess 33. It has become so. In addition, the length of the protruding portion in the extension direction of the contact protrusion 34 is equal to or less than the depth of the contact recess 25 of the electrode portion 20, for example, the same or substantially the same length as the depth of the contact recess 25 of the electrode 20 It has become. Further, the diameter of the contact protrusion 34 is larger than the diameter of the contact recess 25 of the electrode portion 20, and the contact protrusion 34 is press-fit into and accommodated in the contact recess 25 of the electrode portion 20, respectively. ing. Also, the contact protrusion 34 is formed in a conical or substantially conical shape whose tip is matched to the tapered shape of the contact recess 25 of the electrode portion 20. The surface of the contact protrusion 34 is formed of a conductor such as metal. The contact protrusion 34 may be entirely formed of a metal material. The lead wire connected to the above-described signal analysis device is connected to the contact protrusion 34 in the connection target member 30.

  The holder unit 10, the electrode unit 20, and the connection target member 30 each have the above-described configuration, and the electrode unit 20 is accommodated in the accommodation recess 12 of the holder unit 10 in the brain wave detecting biological electrode 1 The connection target member 30 is held in the housing recess 12 of the holder 10. Specifically, the plurality of projecting portions 22 of the electrode portion 20 penetrates the through hole 11 and protrudes from the outer surface 13 b of the disc portion 13 of the holder portion 10, and the base portion 21 of the disc portion 13 of the holder portion 10. It is in contact with the facing surface 13a. Further, the contact protrusion 34 of the connection target member 30 is press-fit into the contact recess 25 of the electrode unit 20. Thus, the electrode portion 20 is in contact with and fixed to the facing surface 31 a of the connection target member 30. Further, in the main body portion 31 of the connection target member 30, the projecting portion of the holding member 16 is compressed between the annular groove 15 in the inner peripheral surface 14a of the cylindrical portion 14 and the outer peripheral surface 31c of the main body portion 31 of the connection target member 30. Thus, it is held in the holding member 16 and held in the housing recess 12 of the holder portion 10. Further, the main body portion 31 of the connection target member 30 compresses and holds the base portion 21 of the electrode portion 20 with the disk portion 13 of the holder portion 10. Thus, the base portion 21 of the electrode unit 20 is held between the connection target member 30 and the holder unit 10.

  As described above, according to the electroencephalogram detection biological electrode 1, the contact protrusion 34 of the connection target member 30 is press-fit into the contact recess 25 of the electrode portion 20, and the contact recess 25 of the electrode portion 20 and the connection target member 30 The contact projections 34 are in contact with each other with uniform surface pressure. Therefore, the entire side surface of the portion inserted into the contact recess 25 of the contact protrusion 34 is pressed against the contact recess 25 with a uniform force, and the contact between the contact recess 25 and the contact protrusion 34 is uniform. The state can be held, and the generation of the noise of the electrical signal transmitted as the detected brain wave can be prevented. In addition, the contact by the contact projection 34 of the connection target member 30 has a contact area smaller than the contact between the connection target member 30 and the electrode portion 20, so that the maintenance of a uniform contact state is facilitated. Can do.

  Further, in the electroencephalogram detection biological electrode 1, the protrusion 22 of the electrode unit 20 penetrates the through hole 11 of the holder 10, and the contact protrusion 34 of the connection target member 30 is in the contact recess 25 of the electrode 20. Since the holder portion 10 and the connection target member 30 can not be rotated relative to each other because they are press-fitted, the holder portion 10 and the connection target member 30 can not be fixed by screws. However, since the holder portion 10 has the holding member 16 which is an annular member formed of an elastic body, the connection target member 30 is inserted into the housing recess 12 so that the connection target member 30 is held by the holding member 16. The connection target member 30 can be fixed in the housing recess 12 by holding.

  In addition, the guide portion 17 for defining the housing direction of the connection target member 30 is formed on the inner surface of the housing concave portion 12, so that the electrode can be simply engaged with the guide groove 32 of the connection target member 30. The protrusion 22 of the portion 20 can be penetrated through the through hole 11 of the holder 10, or the contact protrusion 34 of the connection target member 30 can be pressed into the contact recess 25 of the electrode portion 20. The assembly of the biomedical electrode 1 can be facilitated.

  Further, according to the electroencephalogram detection biological electrode 1, the electrode unit 20 is formed of a conductive elastic body, the electrode unit 20 is easily deformed, and the entire electrode unit 20 contacts the subject's scalp during use. It is easy and the adhesion is improved. On the other hand, although the base portion 21 is also easily deformed, the base portion 21 is firmly held between the connection target member 30 and the holder portion 10, and the electrode portion 20 is pressed against the scalp of the subject. Even when the electroencephalogram detection biological electrode 1 is moved in the state and the angle at which the electrode unit 20 is pressed changes, the electrode unit 20 can be prevented from coming off the holder unit 10. In addition, one electrode unit 20 is provided, and the electrode unit 20 includes the base unit 21 and a plurality of projecting units 22 provided for each of the plurality of through holes 11. Can be attached to the holder portion 10 at a time, the structure of the bioelectrode 1 for detecting an electroencephalogram can be simplified, and the manufacture can be facilitated.

  As described above, according to the electroencephalogram detection biological electrode 1 according to the embodiment of the present invention, it is possible to improve the adhesion and to prevent the generation of noise of the electrical signal transmitted as the detected electroencephalogram. it can.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments of the present invention, but includes all aspects included in the concept and claims of the present invention. In addition, the respective configurations may be selectively combined as appropriate so as to achieve at least a part of the problems and the effects described above. For example, the shape, material, arrangement, size, and the like of each component in the above embodiment can be appropriately changed according to the specific use mode of the present invention.

  For example, as shown in FIG. 4, the electrode unit 20 may be provided for each of the plurality of through holes 11, and each of the electrode units 20 may have one protrusion 22. Thereby, even when it is desired to use the electrode part 20 having a different diameter or shape of the protruding part 22 or when the protruding part 22 is damaged, the electrode part 20 can be easily replaced for each electrode part 20, so that maintenance is possible. And usability can be improved. In this case, a stepped portion 11 a may be formed around the through hole 11 so as to be recessed from the facing surface 13 a that accommodates the base portion 21 of the electrode unit 20.

  Although the embodiment of the present invention has been described by way of example in which the protrusion 22 has the protrusion body 23 and the brush portion 24 as the electroencephalogram detection biological electrode 1, the protrusion 22 has a conical shape or substantially as a whole. It may be formed in a conical shape, and may have another shape such as a cylindrical shape or a prismatic shape.

  Further, the inner peripheral surface 14a of the cylindrical portion 14 is formed in a cylindrical surface shape, a substantially cylindrical surface shape, a disc shape or a substantially disc shape as the living body electrode 1 for electroencephalogram detection, and the main portion 31 of the connection target member 30 is a disc The embodiment of the present invention has been described by way of example in the case where it is formed in the shape of a circle or a substantially disk, but the inner peripheral surface 14a of the cylindrical portion 14 is a square cylindrical surface and the main portion 31 is the inside of the cylindrical portion 14. The shape may be a quadrangular prism corresponding to the circumferential surface 14a, and the shape is not limited.

  Moreover, although the main body portion 31 of the connection target member 30 is held in the housing recess 12 of the holder unit 10 as the electroencephalogram detection bioelectrode 1, the connection target member 30 is fixed to the holder unit 10. The fixing configuration of the holder 10 to the holder 10 is not limited to this. The connection target member 30 may be fixed to the holder portion 10 by a bolt and a screw hole or a nut, or may be fixed by another fixing member. In this case, in the holder portion 10, the accommodation recess 12 may be omitted.

  DESCRIPTION OF SYMBOLS 1 ... Electrode for brain wave detection, 10 ... Holder part, 11 ... Through-hole, 11a ... Step part, 12 ... Housing recessed part, 13 ... Disk part, 13a ... Opposite surface, 13b ... Outer surface, 14 ... Cylindrical part, 14a ... Inner peripheral surface, 14b ... end surface, 14c ... outer peripheral surface, 15 ... annular groove, 15a ... bottom part, 16 ... holding member, 17 ... guide part, 17a ... guide protrusion, 20 ... electrode part, 21 ... base part, 21a ... Opposite surface, 21b: reverse surface, 22: projection, 23: projection main body, 24: brush portion, 25: contact recess, 30: connection target member, 31: main body, 31a: opposite surface, 31b: outside Side surface, 31c: outer peripheral surface, 32: guide groove, 33: contact target member side contact recess, 34: contact protrusion

Claims (6)

A holder portion having a housing recess recessed from one side for housing a connection target member, and a plurality of through holes penetrating from the housing recess to the other side;
An electrode portion formed of at least one conductive elastic body having a base portion extending outward from the peripheral surface of the through hole and at least one protrusion portion that can pass through the through hole protruding from the base portion; Equipped with
The electrode portion has a contact recess that is recessed toward the inside of each of the protrusions,
In the contact recess, a contact protrusion, which is a protruding portion in which the surface of the connection target member is formed of a metal material, is press-fit so that the protrusion of the electrode portion penetrates the holder portion. In the state which penetrates a hole, the contact recess is disposed so as to be able to accommodate the contact projections of the connection target member.   The holder portion has a holding member which is an annular member formed of an elastic body, and the holding member is compressed between the inner surface of the housing recess and the outer surface of the connection target member in the housing recess. The biological electrode for detecting an electroencephalogram according to claim 1, wherein the inner peripheral side portion of the holding member is positioned in the housing recess.   The biological electrode for brain wave detection according to claim 2, wherein the holding member is an O-ring.   The electroencephalogram detection biological electrode according to any one of claims 1 to 3, wherein a guide portion for defining the housing direction of the connection target member is formed on the inner surface of the housing recess.   The device according to any one of claims 1 to 4, wherein one of the electrode portions is provided, and the electrode portion has a plurality of the protruding portions provided for each of the plurality of through holes. A bioelectrode for detecting an electroencephalogram described in the item.   The said electrode part is each provided for every said some through-hole, Each of the said electrode part has one said protrusion part, The any one of the Claims 1 to 4 characterized by the above-mentioned. The bioelectrode for electroencephalogram detection as described.

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