Biological electrode
By designing a rounded, oblique conical protrusion on the periphery of the bioelectrode, the problem of poor scalp contact in subjects with abundant hair was solved, achieving stable contact and pain reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NOK CORP
- Filing Date
- 2022-01-27
- Publication Date
- 2026-06-02
AI Technical Summary
Existing bioelectrodes tend to float on subjects with a lot of hair, making it difficult to make good contact with the scalp, and prolonged pressure can cause pain.
Design a bioelectrode in which the electrode protrusions are arranged on the outer periphery in a manner that avoids the central part. The protrusion height is 6-15mm, and multiple protrusions are located on the outer periphery of the electrode protrusion forming surface. The shape is an inverted oblique cone to ensure that the central part can accommodate hair.
It achieves good contact with the scalp, reduces pressure on the scalp, and reduces pain during measurement, making it especially suitable for subjects with a lot of hair.
Smart Images
Figure CN116887753B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a bioelectrode, specifically a bioelectrode capable of achieving good contact with the scalp of a subject. Background Technology
[0002] In medical facilities and other settings, bioelectrodes are placed on the subject's body to detect various electrical signals in order to diagnose the subject's health status. For example, electroencephalograms (EEGs) are measured by placing electrodes on the subject's scalp.
[0003] Conventionally, bioelectrodes comprising electrode portions made of conductive silicone rubber or the like have been proposed as electrodes for electroencephalography (EEG) measurement (see, for example, Patent Document 1). Examples of such bioelectrodes include electrode portions with multiple sharpened protrusions on one side of the surface in contact with the subject, forming a brush-like electrode portion. Furthermore, bioelectrodes for EEG measurement may also include, for example, a base for mounting the electrode portion, which includes terminals for assembling mating components and insulating rubber for supporting the terminals.
[0004] In the past, in bioelectrodes used for electroencephalogram (EEG) measurement, the number of protrusions at the tip of the electrode was increased to improve the contact area with the subject's scalp. Hereinafter, the number of protrusions on the electrode will sometimes be referred to as the "number of protrusions" of the electrode.
[0005] Existing technical documents
[0006] Patent documents
[0007] Patent Document 1: Japanese Patent Application Publication No. 2017-74369 Summary of the Invention
[0008] The technical problem that the invention aims to solve
[0009] However, if the number of protrusions in the electrode portion of a bioelectrode used for EEG measurement is increased, the protrusions become densely packed relative to a single electrode portion. Therefore, when measuring the EEG of subjects with abundant hair, the space for accommodating hair between the scalp and the electrode portion decreases. Consequently, the electrode portion of such a bioelectrode tends to float off the scalp, making it difficult to make contact with the scalp.
[0010] Furthermore, when testing brainwaves in subjects with abundant hair, it is necessary to apply strong pressure to the bioelectrodes to prevent them from floating due to hair and to ensure firm contact between the electrodes and the subject's scalp. However, if this strong pressure is applied to the bioelectrodes for an extended period, it can sometimes cause scalp pain in the subject.
[0011] In view of the above-mentioned problems, according to the present invention, a bioelectrode capable of achieving good contact with the scalp of a subject can be provided. In particular, a bioelectrode suitable for electroencephalography (EEG) measurement can be provided, which can achieve good contact with the scalp even for subjects with abundant hair.
[0012] Solutions for solving technical problems
[0013] To address the aforementioned technical problems, the present invention provides the following bioelectrode.
[0014] [1] A bioelectrode, wherein,
[0015] Including electrode components that come into contact with the subject's body.
[0016] The electrode component has a plate-shaped electrode body and a plurality of electrode protrusions that protrude from the electrode protrusion forming surface of the electrode body.
[0017] The plurality of electrode protrusions are arranged on the outer periphery of the electrode protrusion forming surface in a manner that avoids the central portion of the electrode protrusion forming surface of the electrode body.
[0018] The protrusion height of each electrode protrusion, from its base end to its front end, is 6 to 15 mm in a direction orthogonal to the forming surface of the electrode protrusion.
[0019] [2] According to the bioelectrode of [1], the plurality of electrode protrusions are respectively configured on the circumference of a virtual circle or a plurality of virtual concentric circles on the outer periphery of the electrode protrusion forming surface.
[0020] [3] The bioelectrode according to [1] or [2], wherein a plurality of said electrode protrusions are equally spaced on the outer periphery of the electrode protrusion forming surface.
[0021] [4] The bioelectrode according to any one of [1] to [3], wherein each of the plurality of said electrode protrusions has a slanted conical shape with its apex rounded.
[0022] [5] The bioelectrode according to any one of [1] to [4], wherein the bioelectrode is used for measuring the brain waves of a subject.
[0023] Invention Effects
[0024] The bioelectrode of this invention achieves good contact with the subject's scalp. Furthermore, the bioelectrode of this invention does not require excessive pressure on the electrode, thus reducing scalp pain during measurement. In particular, stable contact with the scalp can be achieved even for subjects with abundant hair, long hair, or large hair volume (in other words, coarse hair). Attached Figure Description
[0025] Figure 1 This is a schematic front view of a bioelectrode according to one embodiment of the present invention.
[0026] Figure 2 yes Figure 1 The image shows a bottom view of the bioelectrode.
[0027] Figure 3 yes Figure 2 AA section view in the image.
[0028] Figure 4 This is an illustrative diagram showing an example of using bioelectrodes for electroencephalography (EEG) measurements. Detailed Implementation
[0029] The following is a reference to the appendix. Figure 1 The embodiments of the present invention will be described below. It should be noted that the present invention is not limited to the following embodiments, and it should be understood that, without departing from the spirit of the present invention, appropriate design changes and improvements can be made based on the ordinary knowledge of those skilled in the art.
[0030] Figure 1 This is a schematic front view of a bioelectrode according to one embodiment of the present invention. Figure 2 yes Figure 1 The image shows a bottom view of the bioelectrode. Figure 3 yes Figure 2 AA section view in the image. Figure 4 This is an illustrative diagram showing an example of using bioelectrodes for electroencephalography (EEG) measurements.
[0031] like Figures 1-3 As shown, the bioelectrode 1 includes an electrode component 20 having: a plate-shaped electrode body 21; and a plurality of electrode protrusions 22 configured to protrude from the electrode protrusion forming surface 21b of the electrode body 21. The electrode component 20, for example, can detect (retrieve) the subject's biosignals via a connector by bringing the front ends of the plurality of electrode protrusions 22 into contact with the subject's body (skin). The bioelectrode 1 is used, for example, as a bioelectrode for electroencephalogram (EEG) measurement. In this case, the bioelectrode 1 is mounted on the subject's head such that the front ends of the plurality of electrode protrusions 22 in the electrode component 20 are in contact with the subject's scalp. For example, as... Figure 4 As shown, by configuring multiple bioelectrodes 1 at desired locations on the head of the subject 60, various electrical signals such as brain waves of the subject 60 can be detected.
[0032] The bioelectrode 1 can be suitably used to bring the plurality of electrode protrusions 22 of the electrode member 20 into contact with the body of a subject to sense electrical signals from the subject's body, transmit electrical stimulation to the subject, or perform both sensing and transmission. Specifically, for example, the bioelectrode 1 can be used as a medical measuring device, a wearable measuring device, a health monitoring device, etc. In particular, the bioelectrode 1 is preferably used when measuring brain waves as electrical signals.
[0033] The bioelectrode 1 of this embodiment also includes a support member 10 for supporting the electrode member 20. The support member 10 is made of an electrically insulating material. For example, the support member 10 can be formed of silicone rubber or the like. In the bioelectrode 1 of this embodiment, the support member 10 is formed in the shape of a circular plate. The support member 10 has a support surface 10a for supporting the electrode member 20 and a back surface 10b opposite to the support surface 10a. In addition, a through hole 10c is formed at the center of the support member 10, extending through the support member 10 in the thickness direction (i.e., from the support member 10 to the back surface 10b). Figure 3 ).
[0034] It should be noted that the support member 10 only needs to have a structure corresponding to the support surface 10a, the back surface 10b and the through hole 10c, and does not necessarily need to be formed into a circular plate shape.
[0035] In the bioelectrode 1, as described above, the electrode component 20 is made of, for example, conductive rubber, and has an electrode body 21 supported by a support member 10 and a plurality of electrode protrusions 22 protruding from the electrode body 21 to the side opposite to the support member 10. As conductive rubber, examples include so-called conductive silicone rubber comprising silicone rubber and metal particles. As silicone rubber, examples include room temperature curing liquid silicone rubber. Furthermore, as metal particles, examples include silver particles. Room temperature curing liquid silicone rubber refers to silicone rubber that is in a liquid or paste state before curing and undergoes a curing reaction at 20°C to 100°C to become a rubber elastomer. Silver particles may include aggregated particles (aggregates) formed by the aggregation of multiple silver particles (primary particles) or scaly silver particles.
[0036] The conductive rubber forming the electrode component 20 may contain other conductive metal particles, carbon material particles (carbon black, carbon nanotubes, etc.) to replace silver particles. In addition, it may contain reinforcing materials, fillers and various additives as appropriate.
[0037] The electrode body 21 of the electrode member 20 preferably has the same shape as the support member 10. That is, in the bioelectrode 1 of this embodiment, the electrode body 21 is formed in the shape of a circular plate. The electrode body 21 has a supported surface 21a that is supported on the support surface 10a of the support member 10 and an electrode protrusion forming surface 21b on the side opposite to the supported surface 21a.
[0038] Multiple electrode protrusions 22 are formed on the electrode protrusion forming surface 21b of the electrode body 21. The multiple electrode protrusions 22 are arranged on the outer periphery 29 of the electrode protrusion forming surface 21b in a manner that avoids the central portion 28 of the electrode protrusion forming surface 21b of the electrode body 21.
[0039] In the bioelectrode 1 of this embodiment, the protrusion height h of each electrode protrusion 22 disposed on the outer periphery 29 of the electrode protrusion forming surface 21b, as described above, has a particularly important structure. That is, in the bioelectrode 1 of this embodiment, the protrusion height h of each electrode protrusion 22 from its base end to its front end in a direction orthogonal to the electrode protrusion forming surface 21b is 6 to 15 mm. Hereinafter, the protrusion height h of each electrode protrusion 22 from its base end to its front end in a direction orthogonal to the electrode protrusion forming surface 21b will sometimes be simply referred to as "the protrusion height h of the electrode protrusion 22".
[0040] The electrode protrusion 22 of the bioelectrode 1, with a protrusion height h of 6–15 mm, is disposed only on the outer periphery 29 of the electrode protrusion forming surface 21b. Therefore, the central portion 28 of the electrode protrusion forming surface 21b, surrounded by such electrode protrusion 22, becomes a space for accommodating the subject's hair. The space in this central portion 28 has a height corresponding to the protrusion height h of the electrode protrusion 22, allowing for good accommodation of the subject's hair. Therefore, the bioelectrode 1 can achieve good contact with the subject's scalp, and scalp pain during measurement can be reduced without requiring excessive pressure on the bioelectrode 1. In particular, stable contact with the scalp can be achieved even for subjects with abundant hair, long hair (e.g., women with long hair), or large hair volume (in other words, coarse hair).
[0041] When the protrusion height h of the electrode protrusion 22 is less than 6 mm, the space height of the central portion 28 of the electrode protrusion forming surface 21b is too low, and sometimes the space of the central portion 28 cannot be fully utilized to accommodate the subject's hair. For example, generally speaking, the average hair thickness is 0.085 mm, and the number of hairs growing per unit area of the subject's scalp is 208 hairs / cm. 2 Approximately. Below, the number of hairs growing per unit area is sometimes referred to as "hair density (hairs / cm²)". 2)".
[0042] Here, as Figure 4 As shown, when multiple bioelectrodes 1 are placed on the head of the subject 60 and electrical signals such as brain waves are detected, the back of the subject 60's head, as shown in measurement area Oz, is affected by hair from the upper part of the head, making it a location where the bioelectrodes 1 are prone to float. Furthermore, Figure 4 Location x in the figure is assumed to be the area affected by hair overlap during measurement at location Oz, with a length of 5 mm from location Oz to location x. Therefore, when the length of the area affected by hair overlap is defined as 5 mm, the average hair thickness (mm) and hair density (roots / cm²) related to ordinary subjects mentioned above are considered. 2 From this perspective, the number of hairs per unit length is 14, the number of hairs in a straight line up to this range (5mm) is 72, and the hair volume (in other words, the height of the overlapping hairs) when all the hairs in the straight line up to this range (5mm) overlap is 6mm. Therefore, by setting the protrusion height h of the electrode protrusion 22 to 6mm or more, the space of the central portion 28 surrounded by the electrode protrusion 22 can be used to properly accommodate the subject's hair.
[0043] In addition, in subjects with thick and dense hair, the average hair thickness was approximately 0.150 mm, and the hair density was 300 hairs / cm². 2 Approximately. Furthermore, the average hair thickness (mm) and hair density (roots / cm) associated with such subjects... 2 From this perspective, the number of hairs per unit length is 17, the number of straight hairs within the aforementioned range (5 mm) is 87, and the hair volume when all the straight hairs up to the aforementioned range (5 mm) overlap is 13 mm. Therefore, if the protrusion height h of the electrode protrusion 22 is ensured to be 15 mm, even in the case of subjects with thick and dense hair, the space of the central portion 28 surrounded by the electrode protrusion 22 can be used to properly accommodate their hair. However, when the protrusion height h of the electrode protrusion 22 exceeds 15 mm, the protrusion height h of the electrode protrusion 22 is excessive, and sometimes the demolding performance from the mold during the molding of the electrode protrusion 22 deteriorates. In addition, from the viewpoint of minimizing the space of the bioelectrode 1, an excessive protrusion height h of the electrode protrusion 22 is also undesirable.
[0044] Regarding the arrangement of the plurality of electrode protrusions 22 on the outer periphery 29 of the electrode protrusion forming surface 21b, from a balance point of view, it is preferable to arrange them in a circular shape relative to the outer periphery 29 of the electrode protrusion forming surface 21b. For example, it is preferable that each of the plurality of electrode protrusions 22 is arranged on the circumference of a virtual circle 25 on the outer periphery 29 of the electrode protrusion forming surface 21b. It should be noted that the virtual circle can be a single virtual circle or multiple virtual concentric circles. However, the arrangement of the electrode protrusions 22 is not limited to the above; for example, the shape drawn by connecting the points on which the plurality of electrode protrusions 22 are arranged can also be a triangle, a quadrilateral, or the like.
[0045] Preferably, a plurality of electrode protrusions 22 are arranged at equal intervals on the outer periphery 29 of the electrode protrusion forming surface 21b. It should be noted that the interval between two adjacent electrode protrusions 22 does not need to be strictly equal; approximately equal intervals are sufficient. Furthermore, the arrangement of the electrode protrusions 22 is not limited to the above configuration. For example, on the outer periphery 29 of the electrode protrusion forming surface 21b, the intervals between two adjacent electrode protrusions 22 may all be different, for example, having a constant arrangement pattern with two or more different intervals. Further, for example, a plurality of electrode protrusions 22 may be arranged arbitrarily (randomly) on the outer periphery 29 of the electrode protrusion forming surface 21b.
[0046] There is no particular limitation on the number of electrode protrusions 22 disposed on the outer periphery 29 of the electrode protrusion forming surface 21b, which can be appropriately determined according to the size of the electrode protrusion forming surface 21b, etc.
[0047] Furthermore, there are no particular restrictions on the shape of the respective electrode protrusion forming surface 21b, as long as it is formed with a protrusion height h of 6 to 15 mm and protrudes from the electrode protrusion forming surface 21b of the electrode body 21. Here, for an example of the shape of the electrode protrusion forming surface 21b, let's take... Figures 1-3 The electrode protrusion forming surface 21b in the bioelectrode 1 shown is used as an example for illustration.
[0048] like Figures 1-3 As shown in the bioelectrode 1, for example, it is preferable that each of the plurality of electrode protrusions 22 is formed such that its cross-sectional area gradually decreases from the base end (root) towards the front end; in other words, it gradually decreases in cross-sectional area as it moves away from the electrode protrusion forming surface 21b. For example, each of the plurality of electrode protrusions 22 has a circular cross-section that gradually narrows from the base end towards the front end. Furthermore, the center C1 of the cross-section of the base end of each of the plurality of electrode protrusions 22 is positioned on the circumference of the virtual circle 25 on the outer peripheral portion 29 as described above. In such a structure, the center C1 of the cross-section of the base end of each of the plurality of electrode protrusions 22 does not need to be precisely located on the circumference of the virtual circle 25, but only approximately on the circumference.
[0049] Preferably, the front end of each of the plurality of electrode protrusions 22 is formed in a hemispherical shape. Furthermore, viewed from the arrangement center O of the plurality of electrode protrusions 22, it is preferable that the center C2 of the front end of each of the plurality of electrode protrusions 22 (also referred to as the center of the cross-section of the front end portion) is located radially outward from the center C1 of the cross-section of the base end portion. For example, such an electrode protrusion 22 has a shape with a rounded apex of the front end portion in an oblique conical shape. With this configuration, it is possible to ensure a wider space in the central portion 28 of the electrode protrusion forming surface 21b surrounded by the electrode protrusions 22.
[0050] In the bioelectrode 1, the connector 30 is formed as a snap-on connector. More specifically, the connector 30 is formed as a male-side connector in a snap-on connector configuration. Figure 3 As shown, connector 30 includes, for example, a first conductive member 40 and a second conductive member 50 that fit together.
[0051] The first conductive member 40 and the second conductive member 50 are, for example, made of stainless steel. One end of the first conductive member 40 is embedded in the electrode body 21 of the electrode member 20 and extends through the support member 10, while the other end protrudes from the back surface 10b of the support member 10. The second conductive member 50 is disposed on the back surface 10b of the support member 10 in a state of fitting into the other end of the first conductive member 40. Furthermore, the electrode member 20 of the bioelectrode 1 is electrically connected to the outside by being assembled (fitted) into the second conductive member 50 by a female connector (not shown) in a snap-fit connector. That is, the connector 30 is configured such that a portion of it is embedded in the electrode body 21 of the electrode member 20, extends through the support member 10, and the connection portion to the outside is located on the back surface 10b of the support member 10.
[0052] For example, by fitting (adapting) the female connector at the front end of the wire installed in the measuring device to the second conductive member 50, the electrode member 20 of the bioelectrode 1 is electrically connected to the measuring device. The measuring device is a device that takes in biological signals detected by the multiple electrode protrusions 22 of the electrode member 20 of the bioelectrode 1, and processes, displays, analyzes, etc., the input biological signals. There are no particular limitations on the measuring device; for example, it corresponds to an electroencephalogram (EEG) measuring device, a wearable information device, and a health monitoring device.
[0053] Reference Figure 3 The first conductive member 40 and the second conductive member 50 will be described. The first conductive member 40 and the second conductive member 50 are formed into a bottomed cylindrical shape with a flange.
[0054] The first conductive member 40 has: a first bottomed cylindrical portion 41 having an open end 41a at one end and a closed end 41b at the other end; and a first flange portion 42 extending radially outward from the open end 41a of the first bottomed cylindrical portion 41. The outer diameter of the first bottomed cylindrical portion 41 is set to be approximately the same as the diameter of the through hole 10c of the support member 10. A radially recessed fitting portion 43 is formed near the closed end 41b on the outer peripheral surface of the first bottomed cylindrical portion 41. The first flange portion 42 is slightly inclined radially outward than its inner side to the closed end 41b side of the first bottomed cylindrical portion 41.
[0055] Regarding the first conductive member 40, the surface of the first flange portion 42 opposite to the side of the first bottomed cylindrical portion 41 is embedded in the electrode body 21 of the electrode member 20. The first bottomed cylindrical portion 41 is inserted through the through hole 10c of the support member 10 (i.e., extends through the support member 10), and the portion of the first bottomed cylindrical portion 41 on the closed end 41b side (including the fitting portion 43) protrudes from the back surface 10b of the support member 10. It should be noted that the surface of the first flange portion 42 opposite to the side of the first bottomed cylindrical portion 41 is referred to as the "embedded surface" below.
[0056] The second conductive member 50 includes: a second bottomed cylindrical portion 51 having an open end 51a at one end and a closed end 51b at the other end; and a second flange portion 52 extending radially outward from the open end 51a of the second bottomed cylindrical portion 51. The second bottomed cylindrical portion 51 is formed such that its inner diameter increases as it moves from the open end 51a toward the closed end 51b. The inner diameter of the open end 51a of the second bottomed cylindrical portion 51 is set to be approximately the same as the outer diameter of the fitting portion 43 formed on the outer peripheral surface of the first bottomed cylindrical portion 41 of the first conductive member 40. It should be noted that the side surface and the bottom surface of the second bottomed cylindrical portion 51 are connected by a smooth curved surface. The second flange portion 52 has an inclined portion that is radially outward from the closed end 51b of the second bottomed cylindrical portion 51.
[0057] The second conductive member 50 uses riveting or the like to fit and fix the open end 51a of the second bottomed cylindrical portion 51 to the fitting portion 43 of the first bottomed cylindrical portion 41 of the first conductive member 40, thereby forming the connector 30 of the bioelectrode 1.
[0058] Next, an example of a method for manufacturing the bioelectrode 1 will be described. However, the method for manufacturing the bioelectrode 1 is not limited to the following method. Furthermore, in the following description, the connector 30 is pre-installed on the support member 10. Specifically, the first bottomed cylindrical portion 41 of the first conductive member 40 is inserted through the through hole 10c of the support member 10 from the closed end 41b side, and the open end 51a of the second bottomed cylindrical portion 51 of the second conductive member 50 is fitted into the fitting portion 43 of the first bottomed cylindrical portion 41 of the first conductive member 40, which protrudes from the back surface 10b of the support member 10. Thus, an assembly of the support member 10 and the connector 30 is pre-formed. Therefore, in the following manufacturing method, the connector 30 is considered as a component provided on the support member 10 side.
[0059] In the manufacture of bioelectrode 1, firstly, a liquid or paste-like conductive rubber containing silicone rubber and metal particles is stirred, and then the stirred conductive rubber is injected into a molding die (cavity) having the shape of electrode component 20. Thus, within the molding die, the conductive rubber is formed into the shape of electrode component 20.
[0060] Next, with the support surface 10a of the support member 10 facing downwards, the support member 10 on which the connector 30 is mounted, i.e., the assembly of the support member 10 and the connector 30, is placed on the conductive rubber within the molding die. Thus, the support surface 10a of the support member 10 is positioned at a location corresponding to the supported surface 21a of the conductive rubber electrode body 21, which is formed in the shape of the electrode member 20. Furthermore, the embedded surface of the first flange portion 42 of the first conductive member 40 is embedded at a location corresponding to the conductive rubber electrode body 21, which is formed in the shape of the electrode member 20.
[0061] Next, with the assembly containing the support member 10 and the connector 30, the conductive rubber molded into the shape of the electrode member 20 is cross-linked. This cures the conductive rubber, which is shaped like the electrode member 20, thereby integrating the first conductive member 40 with the electrode member 20. That is, the electrode member 20, having the connector 30 and the electrode body 21, is molded as a single unit. Thus, the support member 10, the electrode member 20, and the connector 30 are integrated. Afterward, the integrated support member 10, electrode member 20, and connector 30 are removed from the molding die and subjected to subsequent processing as needed, thereby enabling the manufacture of the bioelectrode 1.
[0062] Industrial availability
[0063] The bioelectrode of the present invention is used as a bioelectrode for contacting the subject's body to sense electrical signals from the subject's body, to transmit electrical stimulation to the subject, or to perform both sensing and transmission.
[0064] Explanation of reference numerals in the attached figures
[0065] 1: Bioelectrode
[0066] 10: Supporting components
[0067] 10a: Support surface
[0068] 10b: Back
[0069] 10c: Through hole
[0070] 20: Electrode components
[0071] 21: Electrode Main Body
[0072] 21a: Supported surface
[0073] 21b: Electrode protrusion forming surface
[0074] 22: Electrode protrusion
[0075] 25: Virtual Circle
[0076] 28: Central Department
[0077] 29: Peripheral part
[0078] 30: Connector
[0079] 40: First conductive component
[0080] 41: First bottomed cylindrical section
[0081] 41a: Open end
[0082] 41b: Blocking end
[0083] 42: First flange portion
[0084] 43: Chimeric part
[0085] 50: Second conductive component
[0086] 51: Second bottomed cylindrical section
[0087] 51a: Open end
[0088] 51b: Blocking end
[0089] 52: Second flange portion
[0090] 60: Subjects
[0091] C1: The center of the cross-section at the base of the electrode protrusion.
[0092] C2: Center of the front end of the electrode protrusion
[0093] h: Protrusion height
[0094] O: Center for the configuration of multiple electrode protrusions
[0095] Oz: Measurement area
[0096] x: Location
Claims
1. A bioelectrode, wherein, Including electrode components that come into contact with the subject's body. The electrode component has a plate-shaped electrode body and a plurality of electrode protrusions that protrude from the electrode protrusion forming surface of the electrode body. The plurality of electrode protrusions are arranged on the outer periphery of the electrode protrusion forming surface in a manner that avoids the central portion of the electrode protrusion forming surface of the electrode body. The protrusion height of each electrode protrusion, from its base end to its front end, is 6 to 15 mm in a direction orthogonal to the surface in which the electrode protrusions are formed. The plurality of electrode protrusions are respectively configured on the circumference of a virtual circle or a plurality of virtual concentric circles on the outer periphery of the electrode protrusion forming surface, and the plurality of electrode protrusions are equally spaced on the outer periphery of the electrode protrusion forming surface. Each of the plurality of electrode protrusions has a slanted conical shape with rounded apexes, and is formed such that the cross-sectional area gradually decreases from the base end to the front end. The plurality of electrode protrusions are respectively arranged on the circumference. When viewed from the center of the arrangement of the plurality of electrode protrusions, the center of the front end of each of the plurality of electrode protrusions is located radially outward from the center of the cross-section of the base end.
2. The bioelectrode according to claim 1, wherein, The bioelectrodes are used for measuring the subject's electroencephalogram (EEG).