CN111281380A - Hair-entering type electroencephalogram cap - Google Patents

Abstract

The hair type EEG cap disclosed in the present invention comprises: a base, a plurality of EEG stem electrodes, and a plurality of elongated support rods, one end of the support rod is connected to the base, and the other end of the support rod is connected to the EEG stem Electrodes, the plurality of support rods are all in a curved shape and tend to converge toward the center at the other end of the support rod. The EEG cap of the present invention has a simple wearing process and basically does not need to be adjusted; thanks to the high elasticity of the filaments, the cap can adapt to a wide range of head circumferences; thanks to the small diameter of the filaments, it can be easily covered or concealed by hair, and it is beautiful, Natural; lightweight and comfortable to wear.

Description

hair type EEG cap

technical field

The invention belongs to auxiliary equipment for brain-computer interaction, and in particular relates to an in-hair EEG cap.

Background technique

An EEG cap is a device that assembles EEG acquisition electrodes and places them stably on the head. Commonly used EEG caps are elastic fabric EEG caps used with Ag/AgCl wet electrodes. Such wet electrodes are usually barrel or bowl-shaped, and do not need to pass through the hair to directly contact the scalp, but require a conductive paste to wet the hair and form an electrical connection with the scalp. This EEG cap needs to inject a sufficient amount of conductive paste one by one through the reserved pores of the electrode to eliminate hair obstruction and form a lower electrode/tissue impedance interface. Although this kind of wet electrode EEG cap is still widely used, it is It has the following shortcomings when using it:

The wearing and gluing of the wet electrode EEG cap is difficult to operate by the user alone, requiring professional assistance, and the operation process is time-consuming and labor-intensive. The injection process of the conductive paste is long, and its residue brings inconvenience to the user and the maintenance of the electrode. It is beneficial for daily application; secondly, the conductive paste will dry out over time, which will increase the interface impedance, which is not suitable for long-term EEG monitoring.

Dry electrode is a new type of sensing technology developed for the defects of wet electrode. It can directly contact the scalp without the need of using conductive paste. The key technology for the practical application of EEG technology.

Compared with wet electrodes, dry electrodes do not have the assistance of conductive paste, and the electrode body itself needs to be in direct contact with the scalp. The contact impedance depends on the conductive material of the electrode on the one hand, and the fixing device of the electrode on the other hand. The stable and reliable fixing structure can not only make the electrode pass through the hair and contact the scalp smoothly, but also provide stable pressure for the electrode to form a good contact interface. . The fixed structure of the current dry electrode EEG cap is relatively cumbersome and complex, and the inertia is large in the state of motion, and it is easy to produce sliding displacement between the head and the scalp when the head is moving, resulting in a decrease in signal quality.

In view of the above problems, the development of a fast-wearing, lightweight and comfortable dry electrode and EEG cap system is a technology that needs to be urgently solved in the daily application of brain-computer interface technology.

SUMMARY OF THE INVENTION

The EEG cap of the present invention provides an elastic internal polymerization structure, so that the EEG cap has a relatively simple structure, has good adaptability to different head shapes, is easy to wear, and basically does not need to be adjusted; High elasticity, the hat can adapt to a wide range of head circumference; thanks to the small diameter of the filament, it can be easily covered or covered by hair, beautiful and natural; light weight, comfortable to wear.

The hair type EEG cap disclosed by the present invention includes:

pedestal,

Several EEG dry electrodes,

A plurality of slender support rods, one end of the support rod is connected to the base, the other end of the support rod is connected to the brain electric dry electrode, the plurality of support rods are all bent and tend to converge toward the center at the other end of the support rod.

An improvement of the hair-in EEG cap disclosed in the present invention, at least a part of the base has an elastic structure with elastic recovery ability perpendicular to its extending direction, and at least a part of the support rod has an elastic structure that is not parallel to its extending direction Elastic structure with elastic resilience.

In an improvement of the hair-in EEG cap disclosed in the present invention, the elastic structure includes a rubber rod, a spring or an elastic metal rod.

In an improvement of the hair-in EEG cap disclosed in the present invention, the cross section of the support rod perpendicular to the extending direction thereof is circular, square or oval.

An improvement of the in-hair EEG cap disclosed by the invention further comprises an amplifying circuit, which is electrically connected with the EEG dry electrodes and amplifies the detection signals obtained by the amplifying circuit.

An improvement of the hair-in EEG cap disclosed by the invention, the amplifying circuit is arranged on the base.

An improvement of the hair-in EEG cap disclosed by the invention is that the amplifying circuit arranged on the base and the EEG dry electrode arranged at the other end of the support rod are electrically connected through a connecting line arranged along the support rod.

An improvement of the hair type EEG cap disclosed by the invention, the EEG dry electrode is Ag/AgCL sintered dry electrode or pure silver dry electrode or composite dry electrode, and the composite dry electrode is based on polymer material, and is An Ag/AgCL layer or an electrode of the Ag layer is formed on at least part of the surface thereof.

An improvement of the hair-in EEG cap disclosed in the present invention, the EEG dry electrodes are circular, square or elliptical.

A structural scheme of the hair insertion dry electrode EEG cap of the present invention mainly includes:

A set of filament elastic rods that can pass through the hair; small size (in-hair) EEG dry electrodes mounted on the elastic rods; and an amplifier circuit connected to the electrodes.

EEG dry electrodes for collecting EEG signals;

Thin elastic support rod, which can be hidden in whole or in part under the hair, used to fix the EEG dry electrodes, its cross section can be any suitable shape such as circle, square, ellipse, etc., and the material can be metal or polymer material;

The base is used to fix the support rod, and the material can be metal or polymer material;

As an improvement, the dry electrode can be any suitable shape such as spherical, cylindrical, conical, etc.;

As an improvement, the dry electrode material can be made of Ag/AgCL sintered, or a polymer material can be used as the substrate, the surface layer is covered with Ag/AgCL, or pure silver can be used directly;

As an improvement, the elastic support rod is made of metal or polymer material to form a curved thin rod, and its cross-section can be in various suitable shapes such as circle, square, ellipse, etc.

As an improvement, the elastic support rod can fix EEG dry electrodes, and the fixing method can be bonding, injection molding, welding, etc.;

As an improvement, the base, made of non-conductive material, is used to fix the elastic support rod and the signal amplifier. After fixing, the support rod is claw type, which can pass through the subject's hair and be fixed on the head.

Among them, the EEG dry electrode of this solution is relatively small as a whole, which is convenient to pass through the hair when used, and its shape can be any suitable shape such as spherical, cylindrical, conical, etc. according to the actual use needs; EEG dry electrodes The material can be made of Ag/AgCL sintered, or a polymer material can be used as the base material, and the surface layer can be covered with Ag/AgCL, or it can be directly made of pure silver or any other material suitable for electrodes.

Elastic support rod, elastic support rod is a thin rod with a certain shape, the number can be any suitable number, the EEG dry electrode is fixed on the end of the elastic support rod, and the fixing method can be bonding, injection molding, welding, etc., The support rod drives the dry electrode and slides on the scalp to the desired measurement position of the dry electrode; the cross-section of the elastic support rod can be round, square, oval and other suitable shapes; the length of the elastic support rod can be any suitable for use Length; the elastic support rod is formed into the desired shape with metal or polymer material.

The base is used to fix several elastic support rods to form the inward grabbing force of the support rods; the base is also used to fix the signal amplifier, and the base material is non-conductive material.

Signal amplifier (can be an amplifier component formed on a PCB board, or another amplifier component with a separate package), a signal amplifier, connected to the brain electrical dry electrode, and transmits the signal collected by the brain electrical dry electrode to the The amplifier, after being processed by the amplifier, is transmitted to the computer or other equipment. The connection between the signal amplifier and the EEG dry electrodes can be through elastic support rods or through wires.

The solution of the present invention is to provide a device for collecting human brain electrical signals, including electrodes, support rods, bases, amplifiers, wires and the like. The electrodes can collect EEG signals. The electrodes are fixed on the support rod. The support rod is a thin curved elastic rod. Several support rods are fixed on the base to form a certain overall grasping ability. The support rod carries the electrode image during use. The comb goes through the hair like a comb, touches the scalp, and slides into place, securing the electrodes to the head by the overall grip. The EEG signal collected by the electrode is transmitted to the amplifier through the wire, and the amplifier transmits the EEG signal to the computer for analysis and application through Bluetooth, wireless or wired technology. The device is suitable for various fields that need to collect EEG signals, such as medical treatment, education, entertainment, etc.

The electrode cap of the present invention is composed of several highly elastic thin rods, and a dry electrode contact is installed at the end of each thin rod. The thin rods and electrode contacts have a small lateral dimension (cross-sectional radius or side length) and can easily pass through the hair and make contact with the scalp like the teeth of a comb.

The invention overcomes the following problems in the prior art. In the use of the EEG cap, although the dry electrode has the advantages of convenience and speed, due to various reasons such as hair interference, the performance of the dry electrode in signal collection is far Not as good as wet electrodes. The invention uses thin EEG dry electrodes and elastic support rods, and adopts a sliding-in method, so that the hair can be easily opened, the dry electrodes can reach the required measurement position, and contact the scalp well, reducing the interference of the hair, which is beneficial to Improve the performance of EEG dry electrodes to collect signals; the slip-on wearing method is easy to operate, and the EEG dry electrodes and supports can be hidden in the hair, which is convenient and beautiful, and is suitable for various fields that require a brain-computer interface.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments described in this application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of an embodiment of the hair-entry dry electrode EEG cap of the present invention.

Detailed ways

The present invention will be described in detail below with reference to the various embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and the structural, method, or functional transformations made by those of ordinary skill in the art based on these embodiments are all included in the protection scope of the present invention.

The hair type EEG cap disclosed in the solution of the present invention comprises: a base 3, a plurality of EEG dry electrodes 1, a plurality of elongated support rods 2, one end of the support rod 2 is connected to the base 3, and here the support rod 2 is connected with the base The connection of the seat 3 can be the use of jacks or slots, etc. to connect the support rod 2 movably by plugging and unplugging, and the use of screws or screws to match the through-hole screw holes of the base 3 and the support rod 2 at the connection position, etc. Of course, the form of integral connection can also be adopted, for example, the support rod 2 is connected in a form similar to welding, integral molding, etc., so that the base 3 and the support rod 2 are integrally connected. The other end of the support rod 2 is connected to the EEG dry electrode 1, and the connection here can also be in the form of the aforementioned jack socket or screw connection or welding, and only need to adjust the relevant structure adaptively. The plurality of support rods 2 are all in a curved shape and tend to converge toward the center at the other end of the support rod 2. The convergence trend here, as shown in FIG. 1, is caused by the bending of the support rod 2 in whole or in part. This kind of polymerization enables the electrodes to be fitted to the collection site to achieve effective collection, and the space formed between several electrodes can be adjusted appropriately by endowing with appropriate bending elasticity, and the corresponding electrodes are subjected to the central gathering. trend, and achieve the purpose of posting.

Of course, it should be noted that the elastic capacity here may be due to the elastic structure of the base 3 at least partially with elastic recovery ability perpendicular to its extension direction, that is, at least part of the base 3 has the elastic structure as shown in FIG. 1 . The normal direction of the extension surface or other directions not parallel to its extension surface has a certain elasticity (this is because the base 3 basically does not deform in its extension direction during use, so the elastic force in this direction does not have too much elasticity. Therefore, when the electrodes at the ends of the support rods 2 are stretched, the elasticity provided by the base 3 can make the support rods 2 drive the electrodes to have a tendency to return to the center, and the electrodes at the ends cause the electrodes to fit together. detection bit.

The elastic ability here can also be due to the fact that at least part of the support rod 2 has elastic recovery in a direction that is not parallel to its extension direction (this direction refers to a point on the support rod 2 that is not parallel to the tangent of the point). The elastic structure of the elastic recovery ability of the elastic direction of the ability), this elastic structure enables the support rod 2 to expand outward from the center from the free form shown in FIG. The tendency to gather toward the center makes the electrodes at the end of the support rod 2 fit the detection position. The elastic structure here includes a structure obtained by mass such as a rubber rod, a spring, or an elastic metal rod.

In the aforementioned solution, the cross section of the support rod 2 perpendicular to its extending direction is circular, square or oval.

Of course, for the convenience of detection, in the solution including but not mentioned above, this hair type EEG cap also includes an amplification circuit 4 (the amplification circuit may also be provided with a data interface for data acquisition of external devices, so as to realize the detection of EEG data transmission), the amplifying circuit 4 is electrically connected to the brain electrical dry electrode 1 and amplifies the detection signal acquired by it, so as to obtain a more accurate and precise detection signal. At this time, the amplifying circuit 4 (which can be an integrated circuit board or an amplifier as shown in FIG. 1) can be directly arranged on the base 3, and the electrodes and the amplifying circuit 4 can be directly connected to the detection signal. The connection can be realized through wireless signals such as infrared, Bluetooth, WiFi, etc., or through wired connections such as optical fibers and data cables. For example, when a wired connection is adopted, the amplifying circuit 4 disposed on the base 3 and the EEG dry electrode 1 disposed on the other end of the support rod can be electrically connected through a connection line disposed along the support rod 2 .

In addition, the EEG dry electrode 1 here can be a common electrode in the field, such as Ag/AgCL sintered dry electrode or pure silver dry electrode or composite dry electrode. The composite dry electrode is made of polymer materials (such as PP, PE, rubber, etc.). etc.) as a substrate, and an electrode of an Ag/AgCL layer or an Ag layer is formed on at least part of the surface thereof.

In addition, the EEG dry electrode 1 is circular, square or oval.

This embodiment provides an EEG cap with a hair type dry electrode, including an EEG dry electrode 1, a support rod 2, a base 3, and a signal amplifier 4. In this example, the EEG dry electrode 1 is Ag/AgCL sintered. The diameter of the sphere is 1~2mm, the elastic support rod 2 is a stainless steel elastic rod with a diameter of 1~2mm, and the EEG dry electrode is fixed on the elastic rod; the base 3 is processed with polymer material, non-conductive, Several elastic support rods can be fixed on the base to form an inward grasping force, which can be directly fixed on the subject's head; the signal amplifier 4 is used to receive, process and transmit the EEG signals from the EEG dry electrodes .

When in use, place the EEG cap on the top of the subject's head, press down gently, the EEG dry electrode 1 slides into the hair driven by the elastic support rod 2, and slides on the scalp to the desired position, using the elastic force. The gripping force of the support rod is fixed on the head of the receiving part. The signal collected by the EEG dry electrode 1 is transmitted to the base 3 through the stainless steel elastic support rod 2, and then transmitted to the signal amplifier 4 through the wire embedded in the base 3. The signal amplifier receives and processes the signal and transmits it to a computer or other device using Bluetooth technology.

In use, due to the relatively large adaptability of the elastic support rod, the hair-entry dry electrode EEG cap can be applied to different head shapes at the same time, and is easy to wear and take, and the whole is simple and beautiful.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims (9)

1. In-hair EEG cap, including: pedestal, Several EEG dry electrodes, A plurality of slender support rods, one end of the support rod is connected to the base, the other end of the support rod is connected to the brain electric dry electrode, the plurality of support rods are all bent and gathered toward the center at the other end of the support rod the trend of. 2 . The hair-type EEG cap according to claim 1 , wherein at least a part of the base has an elastic structure with elastic recovery ability perpendicular to its extending direction, or at least one of the support rods has an elastic structure. 3 . Its part has an elastic structure with elastic recovery ability not parallel to its extension direction. 3 . The hair-entry EEG cap according to claim 2 , wherein the elastic structure comprises a rubber rod, a spring or an elastic metal rod. 4 . 4 . The hair-embedding EEG cap according to claim 1 , wherein the cross section of the support rod perpendicular to the extending direction thereof is circular, square or oval. 5 . 5 . The implantable EEG cap according to claim 1 , wherein the implanted EEG cap further comprises an amplifying circuit, and the amplifying circuit is electrically connected to the EEG dry electrodes and detects the acquisition of the amplifying circuit. 6 . signal is amplified. 6 . The hair-type EEG cap according to claim 5 , wherein the amplifying circuit is arranged on the base. 7 . 7 . The hair type EEG cap according to claim 6 , wherein the amplifying circuit arranged on the base and the EEG dry electrode arranged at the other end of the support rod are connected by a connection along the support rod. 8 . wire for electrical connection. 8. The hair type EEG cap according to claim 1, wherein the EEG dry electrode is an Ag/AgCL sintered dry electrode or a pure silver dry electrode or a composite dry electrode, and the composite dry electrode is made of The polymer material is used as the base material, and the Ag/AgCL layer or the electrode of the Ag layer is formed on at least part of the surface thereof. 9 . The hair-entry EEG cap according to claim 1 or 8 , wherein the EEG dry electrodes are circular, square or elliptical. 10 .

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