CN111419228A

CN111419228A - Claw-shaped electroencephalogram electrode device based on hydrogel

Info

Publication number: CN111419228A
Application number: CN202010306589.3A
Authority: CN
Inventors: 朱向阳; 秦准; 许海鹏; 盛鑫军; 束小康
Original assignee: Shanghai Jiaotong University
Current assignee: Shanghai Jiaotong University
Priority date: 2020-04-17
Filing date: 2020-04-17
Publication date: 2020-07-17
Anticipated expiration: 2040-04-17
Also published as: CN111419228B

Abstract

The invention provides a claw-shaped electroencephalogram electrode device based on hydrogel, which comprises: an upper spiral push rod, hydrogel and a lower claw-shaped base; the lower claw-shaped base is used for containing the hydrogel and penetrating through hair; the upper screw push rod is used for extruding the hydrogel, so that the hydrogel overflows out of the cylindrical container, passes through the hollow claw and forms a hemispherical bulge structure at the tail end of the claw; the hydrogel is made of a conductive soft material, one end of the hydrogel is in contact with the scalp to be tested, and the other end of the hydrogel is connected with an external electronic component. The invention has the beneficial effects that: the electrode uses soft hydrogel as a conductive medium, and hair does not need to be cleaned after use; the problem that the hydrogel material is soft and cannot penetrate through hair is solved through the claw-shaped structure design; and the soft contact of the hydrogel with the scalp promotes user comfort.

Description

Claw-shaped electroencephalogram electrode device based on hydrogel

Technical Field

The invention relates to the technology in the field of non-invasive electroencephalogram signal acquisition, in particular to an electroencephalogram electrode.

Background

The brain-computer interface technology enables human beings to directly control external equipment through brain signals without the assistance of peripheral nerves and muscles, and brings good news to patients who suffer from stroke, hemiplegia and the like and lose motor functions. Among various brain signal acquisition methods, brain scalp brain waves (EEG) are acquired in a non-invasive manner, and are widely used in assisting a patient in controlling a wheelchair, spelling characters, and motor rehabilitation due to high time resolution, convenience in use, good mobility, and relatively low cost. In order to acquire a high-quality EEG signal, a conventional method is to inject a conductive paste between a metal electrode pad and a human scalp using a wet electrode, but this method is complicated to prepare, and requires a user to frequently wash the hair and the electrode, which causes inconvenience in practical use.

Through the search discovery of the prior art, Chinese patent publication No. CN109567800A, published as 2019.04.05, discloses an electroencephalogram dry electrode and electroencephalogram acquisition equipment, which are characterized by comprising a conductive connecting base, hydrogel and an ionic membrane; the hydrogel is arranged on the conductive connecting base, and the ionic membrane is tightly attached to the surface of the hydrogel; when the ionic membrane contacts human skin, allowing the skin surface and the hydrogel containing ions to perform ion exchange; and charge exchange is carried out between the conductive connecting base and the hydrogel so as to acquire electroencephalogram signals. The hydrogel is used as a conductive material, so that the contact impedance between the skin and the electrode is greatly reduced, and the quality of signal acquisition and the use comfort are improved.

Therefore, those skilled in the art are devoted to develop a new hydrogel electroencephalogram electrode which can penetrate through hair to contact scalp, can reduce the contact impedance of the electrode-scalp, and has the advantages of convenient use, no need of cleaning, low cost and the like.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the claw-shaped electroencephalogram electrode based on the hydrogel, solves the problems that the preparation of a wet electrode is complex and the hair needs to be frequently cleaned, and solves the problem that the hair cannot be penetrated through by the claw-shaped structure.

A hydrogel-based claw-like electroencephalogram electrode device, comprising: hydrogel, lower claw base; the lower claw-shaped base is used for containing the hydrogel and penetrating through hair; the hydrogel is made of a conductive soft material, one end of the hydrogel is in contact with the scalp to be tested, and the other end of the hydrogel is connected with an external electronic component.

Further, the lower claw mount includes: a cylindrical container, a claw; the hydrogel is placed in the cylindrical container.

Further, the claw is hollow and is communicated with the cylindrical container.

Further, the claw is made of flexible materials.

Further, the number of the claws is more than 1, and the claws are arranged in a circular array mode.

Further, comprising: an upper spiral push rod; the upper screw push rod is used for extruding the hydrogel, so that the hydrogel overflows out of the cylindrical container, passes through the hollow claw and forms a hemispherical bulge structure at the tail end of the claw.

Further, the upper screw push rod includes: the conical connecting nut, the internal thread shell and the cylindrical push rod are arranged on the outer wall of the shell; the conical connecting nut is fixedly connected with the cylindrical push rod through threads, and the internal thread shell and the cylindrical push rod can rotate relatively;

further, the outer wall of the cylindrical push rod is provided with a concave key groove, the inner wall of the cylindrical container is provided with a convex key, and the key groove and the key are designed to be mutually matched for preventing the cylindrical push rod from rotating.

Further, the device comprises an electrode plate and a shielding connecting wire; one end of the hydrogel is connected with an external electronic component through the electrode plate and the shielding connecting line.

Furthermore, a conical groove is formed in the bottom end of the cylindrical push rod, and the electrode plate is made into a conical shape matched with the conical groove and is installed in the conical groove.

The beneficial effect of this application is: the electrode uses soft hydrogel as a conductive medium, and hair does not need to be cleaned after use; the problem that the hydrogel material is soft and cannot penetrate through hair is solved through the claw-shaped structure design; and the soft contact of the hydrogel with the scalp promotes user comfort.

Drawings

FIG. 1 is a structural cross-sectional view of a preferred embodiment of the present application;

FIG. 2 is a cross-sectional view of an assembled structure of a preferred embodiment of the present application;

FIG. 3 is a schematic representation of the use of a preferred embodiment of the present application;

the device comprises a shielding connecting wire 1, a conical connecting nut 2, an internal thread shell 3, a cylindrical push rod 4, a hot melt adhesive 5, a metal electrode plate 6, hydrogel 7, a cylindrical container with a lower claw-shaped base 8, a key groove structure 9, a claw with a lower claw-shaped base 10, a lower claw-shaped base 11, an upper spiral push rod 12 and an electrode fixing head band 13.

Detailed Description

The preferred embodiments of the present application will be described below with reference to the accompanying drawings for clarity and understanding of the technical contents thereof. The present application may be embodied in many different forms of embodiments and the scope of the present application is not limited to only the embodiments set forth herein.

The structural section of one embodiment of the invention as shown in fig. 1:

the method comprises the following steps: an upper spiral push rod 12, a metal electrode plate 6, hydrogel 7 and a lower claw-shaped base 11; the metal electrode plate 6 is fixed at the bottom end of the upper spiral push rod 12 through the hot melt adhesive 5; the hydrogel 7 is placed in the cylindrical container 8 of the lower claw-shaped base 11; the upper screw push rod 12 and the lower claw-shaped base 11 are connected by screw threads.

The upper spiral push rod 12 comprises three components, namely a conical connecting nut 2, an internal thread shell 3 and a cylindrical push rod 4, the conical connecting nut 2 is fixedly connected with the cylindrical push rod 4 through threads, and the internal thread shell 3 and the cylindrical push rod 4 can rotate relatively; the cylindrical push rod 4 has a through hole for passing through the shield connecting wire 1, a tapered groove at the bottom for placing the metal electrode sheet 6, and a concave groove with a width of 1.5mm on the outer wall.

The conical connecting nut 2 is used for fixing the claw-shaped electroencephalogram electrode on the electroencephalogram cap and limiting the axial movement of the internal thread shell 3.

The metal electrode plate 6 is in a cone shape, and the bottom of the cone is provided with a shielding connecting wire 1 which is used for connecting with an external electronic component; the metal electrode plate 6 protrudes out of the bottom end of the cylindrical push rod 4 by 2.5 mm.

The hydrogel 7 is a cylindrical soft material and has electrical conductivity.

The lower claw-shaped base 11 has an external thread, a cylindrical container, and a plurality of claws are provided at the bottom. The claws 10 are in the shape of circular truncated cones, have inner oblique through holes and are connected with the cylindrical container 8, and the claws are made of soft materials and are arranged in a circular array mode. The inner wall of the cylindrical container is provided with a convex key with the width of 1.4mm, and the convex key is used for being matched with a groove with the width of 1.5mm recessed on the outer wall of the cylindrical push rod 4, so that the cylindrical push rod 4 is prevented from being driven to rotate when a thread is screwed, and the hydrogel is prevented from rotating and distorting and is extruded and deformed unevenly.

Fig. 2 shows a sectional view of the assembled structure:

when the electrode is assembled, firstly, the hydrogel 7 is placed in the cylindrical container 8 of the lower claw-shaped base 11, then the assembled upper spiral push rod 12 is screwed to press the hydrogel 8 placed in the lower claw-shaped base 11, the hydrogel 8 is extruded from the inner inclined through hole of the claw 10, and a hemispherical bulge structure is formed at the tail end of the claw and is used for contacting with the scalp; the connection area can be increased by controlling the screwing force to adjust the protruding area of the hydrogel, and the connection condition of the hydrogel and the scalp is improved.

As shown in figure 3, which is a schematic use diagram of the electrode of the invention, the assembled claw-shaped electroencephalogram electrode is fixed on a simple electroencephalogram cap with holes through a conical connecting nut 2.

The foregoing detailed description of the preferred embodiments of the present application. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the concepts of the present application should be within the scope of protection defined by the claims.

Claims

1. A claw-shaped electroencephalogram electrode device based on hydrogel is characterized by comprising: hydrogel, lower claw base; the lower claw-shaped base is used for containing the hydrogel and penetrating through hair; the hydrogel is made of a conductive soft material, one end of the hydrogel is in contact with the scalp to be tested, and the other end of the hydrogel is connected with an external electronic component.

2. The hydrogel-based claw brain electrode assembly of claim 1, wherein said lower claw mount comprises: a cylindrical container, a claw; the hydrogel is placed in the cylindrical container.

3. The hydrogel-based claw brain electrode assembly of claim 2, wherein said claw is hollow and in communication with said cylindrical container.

4. The hydrogel-based claw electroencephalogram electrode apparatus of claim 2, wherein the material of the claw is a flexible material.

5. The hydrogel-based claw electroencephalogram electrode apparatus of claim 2, wherein the number of claws is greater than 1, arranged in a circular array.

6. The hydrogel-based claw brain electrode assembly of claim 3, comprising: an upper spiral push rod; the upper screw push rod is used for extruding the hydrogel, so that the hydrogel overflows out of the cylindrical container, passes through the hollow claw and forms a hemispherical bulge structure at the tail end of the claw.

7. The hydrogel-based claw brain electrode assembly of claim 6, wherein said upper helical push rod comprises: the conical connecting nut, the internal thread shell and the cylindrical push rod are arranged on the outer wall of the shell; the conical connecting nut is fixedly connected with the cylindrical push rod through threads, and the internal thread shell and the cylindrical push rod can rotate relatively.

8. The hydrogel-based claw brain electrode assembly of claim 7, wherein said cylindrical pushrod has an outer wall with a recessed keyway and said cylindrical vessel has an inner wall with a raised key, said keyway and said key being designed to cooperate to prevent rotation of said cylindrical pushrod.

9. The hydrogel-based claw electroencephalogram electrode device of claim 7, comprising an electrode pad, a shielded connection wire; one end of the hydrogel is connected with an external electronic component through the electrode plate and the shielding connecting line.

10. The hydrogel-based claw electroencephalogram electrode device of claim 9, wherein a conical groove is formed at the bottom end of the cylindrical push rod, and the electrode sheet is made into a conical shape matching the conical groove and is mounted in the conical groove.