JP5842198B2 - Electroencephalogram measurement electrode, electroencephalogram measurement member, and electroencephalogram measurement apparatus - Google Patents

Electroencephalogram measurement electrode, electroencephalogram measurement member, and electroencephalogram measurement apparatus Download PDF

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JP5842198B2
JP5842198B2 JP2011262032A JP2011262032A JP5842198B2 JP 5842198 B2 JP5842198 B2 JP 5842198B2 JP 2011262032 A JP2011262032 A JP 2011262032A JP 2011262032 A JP2011262032 A JP 2011262032A JP 5842198 B2 JP5842198 B2 JP 5842198B2
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electroencephalogram measurement
electroencephalogram
electrode
metal
scalp
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JP2013111361A (en
Inventor
滋 外山
滋 外山
憲司 神作
憲司 神作
高野 弘二
弘二 高野
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公益財団法人ヒューマンサイエンス振興財団
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/04Measuring bioelectric signals of the body or parts thereof
    • A61B5/0476Electroencephalography
    • A61B5/0478Electrodes specially adapted therefor

Description

  The present invention relates to an electroencephalogram measurement electrode, an electroencephalogram measurement member, and an electroencephalogram measurement apparatus.

  As an electrode for this type of electroencephalogram measurement, for example, Patent Document 1 includes a projecting portion having conductivity and being deformable by being formed of a conductive gel, and by contacting the projecting portion with the scalp, An electroencephalogram measurement electrode (chip portion) for measuring an electroencephalogram generated by brain activity is disclosed. The electroencephalogram measurement electrode disclosed in Patent Document 1 is deformed when the protruding portion comes into contact with the scalp, so that the pressure applied to the scalp can be reduced and the burden on the scalp can be reduced.

JP 2011-120866 A

  However, the electroencephalogram measurement electrode using the conductive gel as disclosed in Patent Document 1 is easily deformed by the electroencephalogram measurement electrode (particularly the protruding portion), and the conductive gel portion is also deteriorated by drying. It was early. For this reason, the electroencephalogram measurement electrode may be disposable.

  The present invention has been made in view of the above circumstances, and an electroencephalogram measurement electrode that can be used multiple times while suppressing the burden on the scalp, and an electroencephalogram measurement member and an electroencephalogram using the electroencephalogram measurement electrode It aims at providing a measuring device.

In order to achieve the above object, an electroencephalogram measurement electrode according to the first aspect of the present invention comprises:
An electroencephalogram measuring electrode for measuring an electroencephalogram,
The base,
A protrusion made of rubber provided protruding from the base, and
Provided at the tip of the protruding portion, electrically connected to the outside of the electroencephalogram measurement electrode, and in contact with the scalp when measuring the electroencephalogram, a contact portion made of metal,
It is characterized by providing.

The protrusion is made of conductive rubber,
The contact portion is electrically connected to the outside via the protrusion.
You may do it.

Further provided with a deformable conductor provided on the protrusion,
The contact portion is electrically connected to the outside via the conductor.
You may do it.

Further provided with a deformable conductor provided on the protrusion,
The contact portion is formed integrally with the conductor, and is electrically connected to the outside via the conductor.
You may do it.

The contact portion is composed of a plurality of metal particles.
You may do it.

The contact portion is made of a metal film.
You may do it.

The protrusion is at least partially covered with a metal film that is electrically connected to the outside.
You may do it.

Further comprising a spacer provided on the base,
The spacer shortens the portion inserted between the hairs of the protruding portion when measuring the electroencephalogram,
You may do it.

In order to achieve the above object, the electroencephalogram measurement member according to the second aspect of the present invention comprises:
The electroencephalogram measurement electrode;
A covering member that covers the scalp, and is attached so that the electroencephalogram measurement electrode contacts the scalp;
It is characterized by providing.

In order to achieve the above object, an electroencephalogram measurement apparatus according to the third aspect of the present invention provides:
Comprising the above electroencephalogram measurement electrode,
It is characterized by that.

  According to the present invention, the electroencephalogram measurement electrode can be used multiple times while suppressing the burden on the scalp.

1 is a schematic diagram showing an electroencephalogram measurement apparatus according to a first embodiment of the present invention. It is principal part sectional drawing of the electrode member with which the electroencephalogram measurement apparatus which concerns on the 1st Embodiment of this invention is equipped, and a cap. It is an expanded sectional view of the cover part of FIG. It is an expanded sectional view of the electrode for electroencephalogram measurement of FIG. It is the figure which looked at the electrode for electroencephalogram measurement of FIG. 2 from the direction which the protrusion part protrudes. It is sectional drawing of the electrode for electroencephalogram measurement which concerns on the 2nd Embodiment of this invention. It is sectional drawing of the electrode for electroencephalogram measurement which concerns on the 3rd Embodiment of this invention. It is sectional drawing of the electrode for electroencephalogram measurement which concerns on the 4th Embodiment of this invention. It is sectional drawing of the electrode for electroencephalogram measurement which concerns on the 5th Embodiment of this invention. It is sectional drawing showing the electrode for electroencephalogram measurement which concerns on the modification 1 in this invention. It is sectional drawing showing the electrode for electroencephalogram measurement etc. which concerns on the modification 2 of 1st Embodiment in this invention. It is sectional drawing showing the electrode for electroencephalogram measurement etc. which concerns on the modification 3 of the 1st Embodiment in this invention. It is sectional drawing of the casting_mold | template for producing the electrode for electroencephalogram measurement which concerns on Example 1 thru | or 3 of this invention. It is the figure which showed the result of having measured the electroencephalogram using the electrode for electroencephalogram measurement of Example 1 of this invention. It is the figure which showed the result of having measured the electroencephalogram using the electrode for electroencephalogram measurement of Example 1 of this invention. 1 is a schematic perspective view of an electroencephalogram measurement electrode according to a first embodiment of the present invention. It is a schematic perspective view of the electroencephalogram measurement electrode according to Modification 4 of the present invention.

  Hereinafter, embodiments of the present invention (electroencephalogram measurement electrode and electroencephalogram measurement apparatus) will be described in detail with reference to the drawings.

(First embodiment)
As shown in FIG. 1, the electroencephalogram measurement apparatus 1000 includes an electrode member 100, a cap 200, a lead wire 500, and a signal analysis apparatus 700.

  The cap 200 covers the head and includes a holder part 210 and a cap part 220. The cap part 220 has a helmet-like or hat-like shape, and is formed of an appropriate material such as a synthetic resin or cloth. The cap unit 220 covers the scalp 400 of a subject (a person who is a subject who measures brain waves). A plurality of holder portions 210 are provided on the cap portion 220 at a predetermined interval. The holder part 210 is a cylindrical member attached to a through hole formed in the cap part 220. Although details will be described later, the electrode member 100 is attached to each holder portion 210.

  The lead wire 500 is a conducting wire such as an insulated wire whose conductor is covered with an insulator. The lead wire 500 has one end electrically connected to the electrode member 100 and the other end electrically connected to the signal analysis device 700.

  The signal analysis device 700 is an electronic device such as a computer. The signal analysis device 700 analyzes an electrical signal representing an electroencephalogram transmitted through the electrode member 100 and the lead wire 500, and performs a predetermined operation according to the analysis result.

  The electrode member 100 includes a lid portion 20, a metal wire 30, and an electroencephalogram measurement electrode 40. As shown in FIG. 2, each electrode member 100 is used by being attached to a holder portion 210 (in FIG. 2, hatching representing a cross section of the cap 200 is omitted).

  The lid portion 20 is formed by a method such as injection molding using a resin material such as an epoxy resin, for example, and is formed in a shape matching the holder portion 210. Specifically, as shown in FIGS. 2 and 3, the lid portion 20 is stretched from a columnar member 20 a and a portion (upper end portion in FIG. 2) opposite to the scalp 400 on the outer peripheral surface of the columnar member 20 a. And a flange portion 20b to be taken out. On the scalp 400 side of the lid portion 20 (the surface on the scalp 400 side of the cylindrical member 20a (the lower surface of the circular member 20a in FIGS. 2 and 3)), a cylindrical shape into which the electroencephalogram measurement electrode 40 can be inserted. A hole 21 is formed, and the electroencephalogram measurement electrode 40 is inserted into the hole 21. Threads are formed on the inner peripheral surface of the holder portion 210 and the outer peripheral surface of the columnar member 20a so that the lid portion 20 and the holder portion 210 can be screwed together. The flange portion 20b is formed so as to come into contact with the upper end surface (the surface on the side opposite to the scalp 400) of the holder portion 210 when the lid portion 20 and the holder portion 210 are screwed at a predetermined degree. In addition, the cover part 20 may be formed from the synthetic resin etc. which have electroconductivity. At this time, the lid 20 is electrically connected to the electroencephalogram measurement electrode 40 and the metal wire 30.

  One end of the metal wire 30 is electrically connected to the electroencephalogram measurement electrode 40, and the other end is electrically connected to the lead wire 500. As shown in FIG. 2, the metal wire 30 penetrates through the center of the lid portion 20 and is inserted almost at the center of the electroencephalogram measurement electrode 40 (base portion 50 described later) (in the drawing, the cross section of the metal wire 30 is shown). The hatching is omitted, and the metal wire 30 is indicated by a solid line). At this time, the metal wire 30 does not penetrate the electroencephalogram measurement electrode 40, and only the tip pierces the electroencephalogram measurement electrode 40. The metal wire 30 is not rotatable with respect to the electroencephalogram measurement electrode 40 and is rotatable with respect to the lid portion 20.

  The metal wire 30 may not be inserted into the electroencephalogram measurement electrode 40 but may be in contact with the surface of the electroencephalogram measurement electrode 40 that is in contact with the lid portion 20. At this time, the electroencephalogram measurement electrode 40 is electrically connected to the metal wire 30. Further, since the metal wire 30 is only in contact with the electroencephalogram measurement electrode 40, it can be rotated with respect to the electroencephalogram measurement electrode 40.

  In addition, a circular metal plate (the same shape as the upper surface of the hole 21) made of a metal material or the like may be provided on the surface of the lid 20 that contacts the upper surface of the hole 21. At this time, the metal wire 30 is not inserted into the electroencephalogram measurement electrode 40 but is electrically connected to the metal plate. Further, the metal plate is electrically connected to the electroencephalogram measurement electrode 40. The electrical signal transmitted to the base 50 is transmitted to the metal wire 30 through this metal plate. By providing the metal plate, a large contact area between the base portion 50 and the metal plate can be obtained, and an electric signal can be easily transmitted.

  As shown in FIGS. 2 and 16, the electroencephalogram measurement electrode 40 includes a base portion 50, a protruding portion 60, and a contact portion 70. The base portion 50 and the protruding portion 60 are made of a deformable conductive rubber or the like, and are formed by an appropriate method such as molding. The conductive rubber can be deformed by having elasticity (hereinafter, the same applies to various rubbers). The conductive rubber is formed of, for example, an organic conductive polymer, a polymer material containing a conductive powder material (such as a liquid silicone resin), or a polymer material impregnated with an ionic liquid. In addition, as the conductive powder material, for example, metal particles such as graphite, carbon nanotubes, and silver fine particles, AgCl particles, powder of organic conductive polymer, and the like are used.

  The base portion 50 is formed in a substantially cylindrical shape that is circular when viewed from the lid portion 20. The base portion 50 is fixed by inserting a metal wire 30 into the center of a circle on the side in contact with the lid portion 20 and is electrically connected to the metal wire 30. At least a part of the base portion 50 is accommodated in the hole 21 of the lid portion 20 and is held by a frictional force between the base portion 50 and the lid portion 20. At this time, the base portion 50 is slidable with respect to the lid portion 20. In addition, the base part 50 does not provide the hole 21 of the lid part 20, but, for example, a fixing part (for example, a claw that hooks the base part 50) provided on the lower surface of the cylindrical member 20a, a fixing part such as an adhesive or an adhesive material. May be fixed to the lower surface of the cylindrical member 20a.

  As shown in FIG. 4, the protrusion 60 is a substantially conical member formed of conductive rubber as described above. As shown in FIG. 2, the protrusion 60 is provided to protrude from the base 50 toward the scalp 400 and is electrically connected to the base 50. Referring to FIG. 5, the protruding portion 60 in the present embodiment is provided with seven protruding portions 60 on the scalp 400 side of the base portion 50. The number of protrusions 60 is not limited to this number, but it is desirable that a plurality of protrusions 60 be provided. In the present embodiment, the protruding portion 60 and the base portion 50 are integrally formed of the same material. The protruding portion 60 may have a shape such as a cylindrical shape, a polygonal prism shape (a shape whose base and top are polygonal), and a polygonal pyramid (a shape whose bottom is polygonal).

  The contact part 70 is a metal lump formed of a metal material, that is, having conductivity. It is directly provided at the tip of the protrusion 60 so as to come into contact with the scalp 400. As a result, the contact portion 70 is also electrically connected to the protruding portion 60. For example, when the base portion 50 and the protrusion portion 60 are molded, the contact portion 70 is directly fused to the protrusion portion 60 (for example, a method such as insert molding) or by a fixing material such as a conductive adhesive material. The protrusion 60 is fixed and provided. The metal lump constituting the contact portion 70 may be a single component such as silver, gold, platinum, or titanium, but is made of an alloy, a conductive metal oxide, a conductive chloride, or the like. It is desirable to be. In addition, the contact part 70 may use a different component by the inside and the exterior, for example, may use silver inside and may use silver chloride outside. The protrusion 60 is electrically connected to the metal wire 30, and the metal wire 30 is electrically connected to the lead wire 500. Therefore, the protrusion 60 and the contact portion 70 are connected to the signal analysis device 700. It is also connected electrically. “Electrically connected” means that both of the connection targets are directly connected, and both of the connection targets (for example, the contact portion 70 and the signal analysis device 700) are connected to other conductive members (for example, the protruding portion 60). And at least one of the two (for example, the contact portion 70) and the other (for example, the signal analysis device 700) are connected to each other so that electricity flows. Is also included.

  Here, an attachment method (attachment method) of the electrode member 100 (electroencephalogram measurement electrode 40) to the cap 200 will be described. By inserting and rotating the lid part 20 with the electroencephalogram measurement electrode 40 inserted into the holder part 210, both of them are screwed together by a screw thread, and the lid part 20 is attached to the holder part 210. At this time, the more the cover part 20 is turned, the more the cover part 20 enters the holder part 210 and approaches the scalp 400 (in FIG. 2, it proceeds downward). Since the electroencephalogram measurement electrode 40 is inserted into the lid 20, the electroencephalogram measurement electrode 40 approaches the scalp 400 when the lid 20 approaches the scalp 400, and eventually comes into contact with the scalp 400. Thereafter, when the lid 20 is further rotated, the electroencephalogram measurement electrode 40 presses the scalp 400 with a pressure corresponding to the tightening degree of the lid 20. Therefore, the pressure applied to the scalp 400 of the electrode member 100 can be finely adjusted by adjusting the degree of rotation of the lid 20. When the lid portion 20 enters the holder portion 210 by a predetermined distance, the flange portion 20b comes into contact with the upper end surface of the holder portion 210 (the end surface opposite to the scalp 400 in FIG. 2). Thereby, it can prevent that the cover part 20 approachs into the holder part 210 too much. The lead wire 500 is connected to the metal wire 30 after adjusting the degree of rotation of the lid portion 20.

  Since the electroencephalogram measurement electrode 40 including the base portion 50 is slidably inserted into the lid portion 20, it can rotate independently of the lid portion 20. Normally, the lid 20 and the electroencephalogram measurement electrode 40 rotate together. However, since the lid 20 supports the electroencephalogram measurement electrode 40 so as to be rotatable, the protruding portion 60 of the electroencephalogram measurement electrode 40. When a force that impedes rotation of the electroencephalogram measurement electrode 40 is applied to the electroencephalogram measurement electrode 40, such as when the hair enters between the electrodes or the contact portion 70 contacts the scalp, the lid portion 20 It rotates independently of the measurement electrode 40, so that the electroencephalogram measurement electrode 40 does not rotate. This reduces the risk of the electroencephalogram measurement electrode 40 getting involved in the hair. The metal wire 30 may be prevented from rotating by connecting the lead wire 500 or the like, and the electroencephalogram measurement electrode 40 may not be rotated even when the lid portion 20 is rotated. Thereby, since the electroencephalogram measurement electrode 40 does not rotate from the beginning, the risk of the electroencephalogram measurement electrode 40 getting involved in the hair is reduced.

  Next, an electrical signal from scalp 400 will be described. Electrical signals are transmitted from the scalp 400 to the contact portion 70 that has come into contact with the scalp 400 in accordance with various brain activities. The contact portion 70 that has come into contact with the scalp 400 receives an electrical signal from the scalp 400. This electrical signal represents an electroencephalogram. The transmitted electrical signal is transmitted in the order of the protrusion 60, the base 50, the metal wire 30, and the lead wire 500 (when the above-described metal plate is provided on the base 50, from the base 50, An electric signal is transmitted to the metal wire 30 via the metal plate) and supplied to the signal analysis device 700. The signal analysis device 700 analyzes the supplied electrical signal and identifies the electroencephalogram represented by the electrical signal. In this way, the signal analysis device 700 measures the electroencephalogram. The signal analysis device 700 analyzes the measured electroencephalogram, analyzes the idea of the person (the owner of the measured electroencephalogram), and performs a predetermined operation according to the analysis result. For example, the signal analysis device 700 outputs an analysis result or performs an operation in response to the analysis result.

  Next, the protrusion 60 will be considered. In this embodiment, since the protrusion part 60 is provided between the base part 50 and the scalp 400, when the cover part 20 enters the holder part 210, the protrusion part 60 enters between the hairs and protrudes. The contact part 70 provided at the tip of the part 60 contacts the scalp 400. That is, the electrode member 100 easily contacts the scalp 400 and easily receives an electrical signal from the scalp 400. If the protrusion 60 is not provided, if there is scalp on the surface of the scalp 400, the scalp may be sandwiched between the base 50 and the scalp 400, and the contact part 70 may contact the scalp 400. This may make it difficult to receive electrical signals from the scalp 400. Further, the protrusion 60 is made of rubber as described above, has elasticity, and can be deformed. Therefore, even if the hair wraps around, the protrusion 60 does not pull the hair strongly, and may cause pain and discomfort to the subject. small. Furthermore, when the contact part 70 contacts the scalp 400, the contact part 70 is formed of a metal material (the contact part of the electrode member 100 with the scalp 400 is hard), which may cause pain and discomfort to the subject. However, the protrusion 60 according to the present embodiment has the hardness that the contact portion 70 (metal material) gives to the scalp 400 because the protrusion 60 can be deformed (in particular, the protrusion 60 has flexibility). And bends flexibly) and is less likely to cause pain or discomfort to the subject. Furthermore, even if the electrode member 100 is used on a daily basis and continuously for a long time, the burden on the scalp 400 can be suppressed by deformation (here, bending) of the protrusion 60.

  Further, if at least the protrusions 60 (the base part 50 and the protrusions 60) are formed using a conductive gel, the protrusions 60 are easily deformed and easily deteriorated due to drying. For this reason, the electroencephalogram measurement electrode 40 may be disposable. However, in this embodiment, since conductive rubber is used for the protrusion 60 (and the base 50), the strength is increased, and the electroencephalogram measurement electrode 40 can be used a plurality of times as compared with the case where a conductive gel is used. As described above, in the electroencephalogram measurement electrode 40 according to the present embodiment, the protruding portion 60 is formed of rubber, and the electrical signal from the scalp 400 is received (detected) by the contact portion 70 of the metal material. It is possible to use multiple times while suppressing.

  In addition, the inventor of the present application uses the scalp 400 for the contact portion 70 formed of conductive rubber (that is, the contact portion 70 in the case where the electroencephalogram measurement electrode 40 is integrally formed of conductive rubber including the contact portion 70). When an electroencephalogram was measured in contact with the electroencephalogram, the electrical signal representing the electroencephalogram was not transmitted well from the scalp 400 to the signal analysis device 700, and it was found that the electroencephalogram could not be measured accurately. The inventor of the present application has found that the reason why this phenomenon occurs is that an electric signal representing an electroencephalogram is not successfully transmitted from the scalp 400 to the electroencephalogram measurement electrode 40. Therefore, in the present embodiment, the contact portion 70 is formed of a metal material. By doing in this way, compared with the case where the contact part 70 was formed from electroconductive rubber, it became easy to receive the electrical signal showing an electroencephalogram from the scalp 400, and the electroencephalogram was able to be measured with sufficient precision. It is predicted that this is because the resistance (contact resistance) generated on the contact surface between the contact portion 70 and the scalp 400 is low, and it is easy to receive an electrical signal through the contact portion 70 formed of metal. Is done. As described above, in the electroencephalogram measurement electrode 40 (electroencephalogram measurement apparatus 1000) according to the present embodiment, the electroencephalogram can be accurately measured by providing the contact portion 70 formed of the metal material at the tip of the protrusion 60. At the same time, since conductive rubber is used for the protrusion 60, the burden on the scalp 400 can be suppressed.

  The electroencephalogram measurement apparatus 1000 including the electroencephalogram measurement electrode 40 is, for example, a brain-machine interface (BMI) or a brain-computer interface (Brain-Computer Interface), which has recently been attracting attention for its usefulness. : BCI). BMI (hereinafter, unless otherwise specified, BMI is used as a term representing a concept including BCI) is an electrical signal that represents an electroencephalogram generated by brain activity, and is directly used as a computer or the like. It is an interface of the format to input to the electronic equipment. This is expected to enable more intuitive operation of electronic devices such as computers. In addition, since it is possible to operate a computer or the like without using limbs, it is also expected to be applied in the fields of welfare, medical care, and nursing care.

(Second Embodiment)
Next, an electroencephalogram measurement electrode 40 according to a second embodiment of the present invention will be described with reference to FIG. In describing the second embodiment, points different from the first embodiment will be mainly described, and the same members will be described with the same reference numerals. In 2nd Embodiment, the contact part 70 is comprised with the several metal particle 71 smaller than the metal lump used in 1st Embodiment instead of the single metal lump like 1st Embodiment. Yes. The metal particles 71 are formed of a metal material as in the first embodiment. The metal particles 71 are embedded at the tip of the protrusion 60, and at least a part of the metal particle 71 is exposed on the scalp 400 side of the protrusion 60. The metal particles 71 are electrically connected to the protrusions 60 by the above-described embedding. As a result, as in the first embodiment, each metal particle 71 is also electrically connected to the metal wire 30, the lead wire 500, the signal analysis device 700, and the like. Since each metal particle 71 is formed of a metal material, the metal particle 71 can accurately measure an electroencephalogram as in the first embodiment. The electrical signal received by the metal particles 71 is transmitted in the order of each metal particle 71, the protrusion 60, the base 50, the metal wire 30, the lead wire 500, and the signal analysis device 700. Further, unlike the electroencephalogram measurement electrode 40 according to the first embodiment, each metal particle 71 according to the second embodiment is added to the scalp 400 by making the contact portion 70 into a plurality of small metal particles 71. Disperse pressure and give subject softness.

(Third embodiment)
Next, an electroencephalogram measurement electrode 40 according to a third embodiment of the present invention will be described with reference to FIG. In describing the third embodiment, points different from the first embodiment will be mainly described, and the same members will be described with the same reference numerals. As shown in FIG. 7, the electroencephalogram measurement electrode 40 according to the third embodiment includes a metal part 70a, a first metal film 70b, and a second metal film 70c (in FIG. The hatching representing the cross section of the first metal film 70b and the second metal film 70c is omitted, and the first metal film 70b and the metal film 70c are indicated by bold lines). The metal part 70 a is a metal lump formed of a metal material, that is, having conductivity, and is directly provided at the tip of the protruding part 60. The first metal film 70b covers the metal part 70a. The second metal film 70c covers a portion of the protrusion 60 that may come into contact with the scalp 400. The first metal film 70b and the second metal film 70c are integrally formed of a metal material by a method such as vapor deposition or plating. The first metal film 70b and the second metal film 70c may be formed separately. The first metal film 70b and the second metal film 70c can be deformed, and are configured to maintain the deformation of the protruding portion 60. In the third embodiment, the first metal film 70b and the second metal film 70c are electrically connected to the metal part 70a, the protruding part 60, etc., and electrically connected to the outside of the electroencephalogram measurement electrode 40. Has been. The contact part 70 in the third embodiment is composed of a metal part 70a and a first metal film 70b. The first metal film 70b and the metal film 70c can receive an electrical signal from the scalp when in contact with the scalp.

  Here, consider a case where the second metal film 70c is not covered. The protrusion 60 is deformed when coming into contact with the scalp 400, and may be deformed (bent) so as to be bent, for example. In this case, there is a possibility that the protrusion 60 (particularly, the side surface near the metal portion 70a) contacts the scalp 400. However, since the protrusion 60 is made of conductive rubber, it may be difficult to receive an electrical signal from the scalp 400.

  Therefore, in the third embodiment, the second metal film 70c formed of a metal material causes the protrusion 60 (particularly a portion that may come into contact with the scalp 400 due to deformation of the protrusion 60). Coating. As a result, even if the projecting portion 60 is deformed, the second metal film 70c comes into contact with the scalp 400, so that the electroencephalogram measurement electrode 40 can easily receive an electrical signal from the scalp 400 by the second metal film 70c. The electrical signal received by the first metal film 70b is transmitted in the order of the metal portion 70a, the protruding portion 60, the base portion 50, the metal wire 30, the lead wire 500, and the signal analyzing device 700. Alternatively, the electrical signal received by the second metal film 70c is transmitted in the order of the protruding portion 60, the base portion 50, the metal wire 30, the lead wire 500, and the signal analyzing device 700.

  Further, as in the first embodiment, the first metal film 70b and the second metal are formed by performing vapor deposition, plating, or the like on the tip of the protrusion 60 without providing a metal lump at the tip of the protrusion 60. The film 70c may be formed. The first metal film 70b is a part that can come into contact with the scalp 400 when the projecting portion 60 is not deformed, and the first metal film 70b can be brought into contact with the scalp 400 when the projecting portion 60 is deformed. Part. That is, the contact portion 70 is configured only by the first metal film 70b.

(Fourth embodiment)
Next, an electroencephalogram measurement electrode 40 according to a fourth embodiment of the present invention will be described with reference to FIG. In describing the fourth embodiment, differences from the first embodiment will be mainly described, and similar members will be described with the same reference numerals. As shown in FIG. 8, the electroencephalogram measurement electrode 40 according to the fourth embodiment further includes a metal plate 85a and a conductor 80 (in FIG. 8, the hatching representing the cross section of the conductor 80 is omitted, and the conductor 80 is indicated by a solid line). The metal plate 85a is formed of a conductive metal material, and is provided in a portion of the electrode member 100 that is in contact with the lid portion 20. In the fourth embodiment, the metal wire 30 is electrically connected to the metal plate 85a. At this time, the metal wire 30 is electrically connected to the metal plate 85a so as not to rotate with respect to the metal plate 85a (for example, by not soldering the metal wire 30 and the metal plate 85a). Yes. The conducting wire 80 is made of a conductive metal material and is formed in a deformable (in this case, flexible) thin wire shape. The conducting wire 80 does not prevent the projecting portion 60 from being deformed. The metal plate 85a and the conductive wire 80 may be a single component such as silver, gold, platinum, or titanium, but are made of an alloy, a conductive metal oxide, a conductive chloride, or the like. Is desirable. The conducting wire 80 passes through the inside of the projecting portion 60 and the base portion 50, one end is electrically connected to the contact portion 70, and the other end is electrically connected to the metal plate 85a. As a result, the electrical signal received from the scalp 400 by the contact portion 70 is transmitted to the metal plate 85 a via the conductor 80. Moreover, the protrusion part 60 and the base part 50 which concern on 4th Embodiment are formed with the elastic rubber (synthetic rubber, natural rubber, etc.) which can deform | transform but does not have electroconductivity. As a result, in the fourth embodiment, the protrusion 60 and the base 50 do not have conductivity (without using an organic conductive polymer or conductive powder material) via the metal plate 85a and the conductive wire 80. EEG can be measured. However, the protrusion part 60 and the base part 50 may have electroconductivity. The electrical signal received by the contact unit 70 is transmitted in the order of the conductive wire 80, the metal plate 85 a, the metal wire 30, the lead wire 500, and the signal analysis device 700.

(Fifth embodiment)
Next, an electroencephalogram measurement electrode 40 according to a fifth embodiment of the present invention will be described with reference to FIG. In describing the fifth embodiment, differences from the first embodiment will be mainly described, and similar members will be described with the same reference numerals. As shown in FIG. 9, the electroencephalogram measurement electrode 40 according to the fifth exemplary embodiment includes a metal plate 85 b and a wire (conductive wire) 82 (in FIG. 9, hatching representing a cross section of the wire 82 is omitted). The wire 82 is indicated by a solid line). The metal plate 85b is formed of a conductive metal material, and is provided in a portion of the electroencephalogram measurement electrode 40 that is in contact with the lid portion 20. In the fifth embodiment, unlike the first embodiment, the metal wire 30 is electrically connected to the metal plate 85b. At this time, the metal wire 30 is electrically connected to the metal plate 85b so as not to rotate with respect to the metal plate 85b (for example, by not soldering the metal wire 30 and the metal plate 85b). Yes. The wire 82 is made of a conductive metal material, and is formed in a deformable (flexible) thin line shape. The wire 82 does not prevent the protrusion 60 from being deformed. The metal plate 85b and the conductive wire 80 may be a single component such as silver, gold, platinum, or titanium, but are made of an alloy, a conductive metal oxide, a conductive chloride, or the like. Is desirable. As shown in FIG. 9, the wire 82 passes through the inside of the projecting portion 60, and a part of the wire 82 is exposed to the outside from the scalp 400 side (tip) of the projecting portion 60. The electrical signal is received from the scalp 400 in the same manner as the contact unit 70 according to the embodiment. That is, the contact part 70 of 5th Embodiment is comprised by the part exposed outside from the protrusion part 60 among the wires 82. FIG. One end or both ends of the wire 82 are electrically connected to the metal plate 85b. Moreover, the protrusion part 60 and the base part 50 which concern on 5th Embodiment are formed with the elastic rubber (synthetic rubber, natural rubber, etc.) which can deform | transform but does not have electroconductivity. Thereby, in the fifth embodiment, the electroencephalogram can be measured through the metal plate 85b and the conductive wire 80 without the projecting portion 60 and the base portion 50 having conductivity. However, the protrusion part 60 and the base part 50 may have electroconductivity. The electrical signal received by the contact unit 70 is transmitted in the order of the wire 82, the metal plate 85b, the metal wire 30, the lead wire 500, and the signal analysis device 700.

(Modification)
In addition, this invention is not limited to the said embodiment, The content of the said embodiment can be changed suitably. Although the modification of the said embodiment is shown below, the following modification can be combined suitably. The configurations of the above embodiments can be combined as appropriate.

(Modification 1)
The electroencephalogram measurement electrode 40 according to the above embodiment may further include a spacer 90 as shown in FIG. The spacer 90 adjusts the length of the protrusion 60 that enters between the hairs by contacting the hairs. The spacer 90 is formed of a synthetic resin or the like (for example, has an insulating property. The spacer 90 may have a conductive property), and is fixed to the scalp 400 side of the base portion 50 and provided between the protruding portions 60. . The spacer 90 is formed to increase the length in the direction in which the protruding portion 60 protrudes and shorten the length of the protruding portion 60 protruding from the base portion 50 as the density or amount of hair decreases. Accordingly, when the density or amount of the hair is small, the length of the protrusion 60 entering between the hairs is shortened, and when the density or amount of the hair is large, the length of the protrusion 60 between the hairs. Since the length of penetration increases, the contact portion 70 at the tip of the protruding portion 60 does not pierce the scalp 400 excessively, so that an appropriate pressure can be applied to the scalp 400, and stress applied to the scalp 400 is reduced. Is done.

(Modification 2)
Next, the lid 20 according to the above embodiment may be as shown in FIG. As shown in FIG. 11, the lid portion 20 further includes a convex portion 22 a on the inner peripheral surface of the columnar member 20 a included in the lid portion 20. The convex part 22a of the cover part 20 is formed in a ring shape so as to go around the inner peripheral surface of the columnar member 20a. When the deformable electroencephalogram measurement electrode 40 is inserted into the hole 21 of the lid portion 20, the electroencephalogram measurement electrode 40 is pressed by the convex portion 22a and slightly deformed as shown in FIG. For this reason, since the electroencephalogram measurement electrode 40 is caught by the convex portion 22a, it is possible to prevent the electrode member 100 from being accidentally detached from the lid portion 20 and to handle the electrode member 100 more easily. As described above, since the convex portion 22a is formed in a ring shape so as to go around the inner peripheral surface of the lid portion 20, the electroencephalogram measurement electrode 40 can be rotated in the horizontal direction.

(Modification 3)
Next, the holder part 210 and the lid part 20 according to the above embodiment may be as shown in FIG. As shown in FIG. 12, the lid 20 further includes a convex portion 22b on the outer peripheral surface of the columnar member 20a. The convex portion 22b is formed in a ring shape that goes around the outer peripheral surface of the cylindrical member 20a. As shown in FIG. 12, the holder part 210 further includes a plurality of recesses 230 on the inner peripheral surface. Each recess 230 is formed in a ring shape that goes around the inner peripheral surface of the holder part 210. In addition, each concave portion 230 meshes with the convex portion 22b, so that the distance between the electrode member 100 and the scalp 400 (in the vertical direction in FIG. 12) is fixed (becomes an unexpected cap). As described above, by providing the plurality of recesses 230 on the inner peripheral surface of the holder part 210, the position of the lid part 20 is determined in multiple stages with respect to the holder part 210. Therefore, when it is desired to change the degree of insertion into the holder part 210 of the electrode member 100 after the electroencephalogram measurement electrode 40 is brought into contact with the scalp 400, the degree is changed without turning the electrode member 100. be able to. Moreover, since each recessed part 230 and the convex part 22b are formed in ring shape, the cover part 20 is the direction of the surface which contact | connects the holder part 210 in the cover part 20 with respect to the holder part 210 (in FIG. 12). Slidable in the left and right direction). The cylindrical member 2a and the holder portion 210 are not formed with threads that are screwed together.

(Modification 4)
Next, as shown in FIG. 17, the protrusion 60 according to the above-described embodiment is formed in a concentrically extending manner centering on the protrusion 60 located at the center, as shown in FIG. Alternatively, a plurality of comb-like arrangements (rows) may be formed. The protrusions 60 may be formed in a row in a comb-like arrangement. FIG. 17 is a view in which a part of the entire electroencephalogram measurement electrode 40 according to Modification 4 is cut out and described, and hatching representing a cross section of the base portion 50 is omitted.

  The electroencephalogram measurement electrode 40 according to the present invention will be described in more detail with reference to Example 1. FIG. In Example 1, the electrode member 100 (electroencephalogram measurement electrode 40) and the cap 200 according to the first embodiment shown in FIG. First, several cylindrical through holes with a diameter of 16 mm were formed in a commercially available head protecting cap corresponding to the cap portion 220. Next, a commercially available stainless steel female screw (diameter: 16 mm) was attached to the cylindrical through hole using a silicone-based adhesive. This female screw functions as the holder part 210 in the first embodiment.

  The lid part 20 was produced by pouring an epoxy-based room temperature curing resin technobit (registered trademark) 4004 into a mold having a predetermined shape and curing it. At this time, a silver wire (corresponding to the metal wire 30) having a diameter of 0.5 mm and a length of 20 mm is inserted in the center, and the silver wire is inserted so that both ends of the silver wire come out of the lid portion 20. The position of the silver wire was adjusted so that the length of the silver wire inserted into the electroencephalogram measurement electrode 40 was about 5 mm. After curing, the epoxy-based room temperature curing resin technobit was taken out. And after taking out the said molding, the lead wire 500 was soldered to the silver wire exposed from the surface (upper surface in FIG. 2) by which the flange part 20b of the cover part 20 is arrange | positioned.

  The electroencephalogram measurement electrode 40 was produced using a mold 600 shown in FIG. As shown in FIG. 13, the mold 600 includes an upper mold 610 and a lower mold 620. The upper mold 610 and the lower mold 620 can be separated. In Example 1, the upper mold 610 is formed with seven substantially conical holes having a height of 5 mm and an inner diameter of a cylindrical hole of 16 mm, and the lower mold 620 having an inner diameter of 1.5 mm and a depth of 5 mm. I used what is. An alloy (corresponding to a metal lump of the contact portion 70) was inserted into each of the substantially conical holes of the lower mold 620, and the conductive resin paste was poured into the mold 600. And the conductive resin paste was solidified at 60 degreeC over 15 hours, and the solidified conductive resin paste was taken out from the casting_mold | template 600. FIG. The extracted conductive resin paste is the electroencephalogram measurement electrode 40 according to the first embodiment. The conductive resin paste is obtained by kneading a liquid silicone resin and carbon nanotubes on a weight basis of 92.5% and 7.5%, respectively.

  Next, in Example 2, the electroencephalogram measurement electrode 40 according to the fourth embodiment shown in FIG. 8 was produced. The cap 220 and the lid part 20 were produced by the same procedure as in Example 1. However, in Example 2, the lid part 20 is produced so that the silver wire inserted into the lid part 20 is not inserted into the electroencephalogram measurement electrode 40.

  Also in the second embodiment, the electroencephalogram measurement electrode 40 is formed using the same mold 600 as in the first embodiment. In Example 2, after the alloy was inserted into each conical hole of the lower mold 600, a silver wire (corresponding to the conductive wire 80) was inserted into the mold 600. At this time, the silver wire was inserted into the mold 600 so that one end was electrically connected to each alloy. The silver wire has a diameter of 0.5 mm and a length of 10 mm. Next, unlike Example 1, a resin paste not containing carbon nanotubes, that is, a non-conductive resin paste, was poured into the mold 600. Then, the resin paste is solidified, and the solidified resin paste is taken out from the mold 600. Finally, a metal plate (corresponding to the metal plate 85a) was attached to the solidified resin paste so as to be electrically connected to the other end of the silver wire. As described above, the electroencephalogram measurement electrode 40 according to the fourth embodiment is obtained.

  Next, in Example 3, the electroencephalogram measurement electrode 40 according to the fifth embodiment shown in FIG. 9 was produced. The cap 220 and the lid part 20 were produced by the same procedure as in Example 1. However, in Example 3, the lid part 20 is produced so that the silver wire inserted into the lid part 20 is not inserted into the electroencephalogram measurement electrode 40.

  Also in the third embodiment, the electroencephalogram measurement electrode 40 is formed using the same mold 600 as in the first embodiment. In Example 3, a silver wire (corresponding to the wire 82) was inserted into each conical hole of the lower mold 620. The silver wire has a diameter of 0.1 mm and a length of 20 mm, and is bent into a hairpin shape at substantially the center. Next, a resin paste containing no carbon nanotubes, that is, a resin paste having no electrical conductivity, was poured into the mold 600 to solidify the resin paste. Then, the solidified resin paste was taken out from the mold 600. Finally, a metal plate (corresponding to the metal plate 85b) was attached to the solidified resin paste so as to be electrically connected to one end of the silver wire. From the above, the electroencephalogram measurement electricity 40 according to the fifth embodiment is obtained.

(Measurement result)
Hereinafter, the measurement result of the electroencephalogram by the electrode member 100 according to the first embodiment (Example 1) is shown. Therefore, an electroencephalogram measurement result is shown by using an electroencephalogram measurement electrode 40 as the BMI electrode. BMI is an interface that reads an electrical signal representing an electroencephalogram generated by brain activity and directly inputs it to an electronic device.

  The electroencephalogram measurement was carried out by the following procedure using the cap and the electroencephalogram measurement electrode (cap with electroencephalogram measurement electrode) prepared in Example 1. First, a cap was put on the subject. Next, the electrode member was inserted into the holder part attached to each through-hole of the cap so that the protruding part was directed to the scalp. The electrode member (particularly, the electroencephalogram measurement electrode) was used after being disinfected with ethanol for disinfection immediately before use. The lid was rotated and attached to the holder so that the lid was in a predetermined position relative to the holder. When the electroencephalogram measurement electrode was fastened to the holder part, the electroencephalogram measurement electrode also rotated with the rotation of the lid part at first. However, when the protruding part comes into contact with the hair or scalp, the electroencephalogram measurement electrode does not rotate and the lid part does not rotate. Only independently rotated and the electroencephalogram measurement electrode was pressed against the scalp. For this reason, the electroencephalogram measurement electrode did not involve the subject's hair. At this time, the subject confirmed wearing feeling, but no subject complained of pain or discomfort. Therefore, it was confirmed that the electroencephalogram measurement electrode produced in Example 1 is less likely to cause pain and discomfort to the subject by involving the hair and applying excessive pressure to the scalp.

  After the electroencephalogram measurement electrode is fixed to the scalp at a predetermined position and pressure, the lead wire connected to the electrode member is connected to a commercially available electroencephalograph (manufactured by g.tec), and the scalp and electroencephalogram The impedance between the measurement electrodes was measured. All measured values were 15 kΩ or less, and it was confirmed that a sufficient degree of conduction was ensured for BMI. Further, the electroencephalogram measurement electrodes prepared in Example 2 and Example 3 were measured in the same manner, and it was confirmed that the measured value was 15 kΩ or less.

  Furthermore, an example (graph) of an electroencephalogram measured by the electroencephalogram measurement electrode according to Example 1 is shown using FIGS. 14 and 15, the analog voltage is converted into a digital voltage using an analog-to-digital converter of an electroencephalograph, and 1LSB (minimum resolution) is set to 0.24 pV. The data of the voltage (measured electroencephalogram) are shown. However, in the graphs shown in FIG. 14 and FIG. 15, the electrical signal (voltage) from the scalp is converted into a notch filter by a biquad filter with a bandwidth of 2 Hz and a 20 th order from 1 Hz to 45 Hz. (Brain wave) processed by applying the above bandpass filter on the software. In the graphs shown in FIGS. 14 and 15, the vertical axis represents voltage [μV] and the horizontal axis [ms] represents time. When the electroencephalogram was measured using the electroencephalogram measurement electrode (contact portion formed of a metal material) according to Example 1, it was possible to measure the α wave as shown in FIG. Further, when the subject blinks when the subject is about 600 [ms] and about 1400 [ms] during the electroencephalogram measurement, the waveform on the spike (about 600 [ms] and about 1400 [ms] as shown in FIG. 15). ) Was measured. When an electroencephalogram was measured using an electroencephalogram measuring electrode (contact portion formed from an electrically conductive rubber) formed only from an electrically conductive rubber, an α wave and an electroencephalogram representing blinking could not be measured in the first place. Therefore, when the electroencephalogram was measured using the electroencephalogram measurement electrode according to Example 1, it was confirmed that the electroencephalogram could be measured with higher accuracy than when the contact portion was formed from conductive rubber. As described above, it was confirmed that the electroencephalogram measurement electrode according to Example 1 can accurately measure the electroencephalogram without applying excessive pressure to the scalp. Moreover, since the same impedance as Example 1 is obtained also about Example 2, 3, even when using the electroencephalogram measurement electrode according to Example 2, 3, it is applied to the scalp similarly to Example 1. On the other hand, it is considered that the electroencephalogram can be accurately measured without applying excessive pressure.

  Although the present invention has been described in detail with reference to the embodiments, modifications, and examples, it goes without saying that the scope of the present invention is not limited to the above-described embodiments. Improvements, substitutions, combinations, and the like made by those skilled in the art are included in the scope of the present invention unless they exceed the gist of the present invention.

1000 Electroencephalogram Measurement Device 100 Electrode Member 20 Lid 20a Columnar Member 20b Flange 21 Hole 22a Convex 22b Convex 30 Metal Wire 40 Electroencephalogram Electrode 50 Base 60 Protrusion 70 Contact Part 71 Metal Particle 70a Metal Part 70b First 1 metal film 70c second metal film 80 conductive wire 82 wire 85a metal plate 85b metal plate 90 spacer 200 cap 210 holder part 220 cap part 230 concave part 400 scalp 500 lead wire 600 mold 610 upper mold 620 lower mold 700 signal analysis device

Claims (10)

  1. An electroencephalogram measuring electrode for measuring an electroencephalogram,
    The base,
    A protrusion made of rubber provided protruding from the base, and
    Provided at the tip of the protruding portion, electrically connected to the outside of the electroencephalogram measurement electrode, and in contact with the scalp when measuring the electroencephalogram, a contact portion made of metal,
    An electrode for electroencephalogram measurement comprising:
  2. The protrusion is made of conductive rubber,
    The contact portion is electrically connected to the outside via the protrusion.
    The electrode for electroencephalogram measurement according to claim 1.
  3. Further provided with a deformable conductor provided on the protrusion,
    The contact portion is electrically connected to the outside via the conductor.
    The electrode for electroencephalogram measurement according to claim 1.
  4. Further provided with a deformable conductor provided on the protrusion,
    The contact portion is formed integrally with the conductor, and is electrically connected to the outside via the conductor.
    The electrode for electroencephalogram measurement according to claim 1.
  5. The contact portion is composed of a plurality of metal particles.
    The electrode for electroencephalogram measurement according to any one of claims 1 to 3, wherein:
  6. The contact portion is made of a metal film.
    The electrode for electroencephalogram measurement according to any one of claims 1 to 3, wherein:
  7. The protrusion is at least partially covered with a metal film that is electrically connected to the outside.
    The electroencephalogram measurement electrode according to any one of claims 1 to 6.
  8. Further comprising a spacer provided on the base,
    The spacer shortens the portion inserted between the hairs of the protruding portion when measuring the electroencephalogram,
    The electrode for electroencephalogram measurement according to any one of claims 1 to 7,
  9. Electroencephalogram measurement electrode according to any one of claims 1 to 8,
    A covering member that covers the scalp, and is attached so that the electroencephalogram measurement electrode contacts the scalp;
    A member for measuring electroencephalogram, comprising:
  10. The electroencephalogram measurement electrode according to any one of claims 1 to 8,
    An electroencephalogram measuring apparatus characterized by that.
JP2011262032A 2011-11-30 2011-11-30 Electroencephalogram measurement electrode, electroencephalogram measurement member, and electroencephalogram measurement apparatus Active JP5842198B2 (en)

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EP2868269A1 (en) * 2013-11-05 2015-05-06 Cleveland Medical Polymers, Inc. Polymer nano-composites as dry sensor material for biosignal sensing
JP2016159065A (en) * 2015-03-05 2016-09-05 ニプロ株式会社 Electrodes for detecting brain waves
DE202016100667U1 (en) * 2016-02-10 2016-03-08 Brain Products Gmbh EEG electrode
WO2017155109A1 (en) * 2016-03-11 2017-09-14 アルプス電気株式会社 Bioelectrode, method of manufacturing bioelectrode, and method for collecting electrical signals from bodies
JP6668500B2 (en) * 2016-11-10 2020-03-18 アルプスアルパイン株式会社 Biological information measuring electrode and method for manufacturing biological information measuring electrode
US20200046290A1 (en) * 2017-02-27 2020-02-13 Sharp Kabushiki Kaisha Electrode instrument and biological information measuring device
WO2018186212A1 (en) * 2017-04-07 2018-10-11 アルプス電気株式会社 Electrode for biological information measurement, and method for measuring biological information
JPWO2018230445A1 (en) * 2017-06-16 2020-05-21 Nok株式会社 Bioelectrode
JPWO2019130832A1 (en) * 2017-12-27 2020-10-22 アルプスアルパイン株式会社 Manufacturing method of electrodes for measuring biological information and electrodes for measuring biological information
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WO2020085035A1 (en) * 2018-10-26 2020-04-30 住友ベークライト株式会社 Bioelectrode, biological sensor, and biological signal measurement system
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