CN110680311B

CN110680311B - Dry electrode brain electricity collection system

Info

Publication number: CN110680311B
Application number: CN201910813013.3A
Authority: CN
Inventors: 郑德智; 张帅磊
Original assignee: Beihang University
Current assignee: Beijing Xinhua Department Of Instrument Science And Technology Co ltd
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2020-11-03
Anticipated expiration: 2039-08-30
Also published as: CN110680311A

Abstract

The invention discloses a dry electrode electroencephalogram acquisition device which comprises an ear hook, an inflation assembly, a machine body box, an electrode and a signal processing circuit. By adopting the technical scheme of the invention, the size of the air bag can be changed by inflating and deflating the air bag, so that the electrode is fully contacted with the skin in the ear, and the acquisition of high-quality electroencephalogram signals is ensured.

Description

Dry electrode brain electricity collection system

Technical Field

The invention belongs to the field of electroencephalogram signal acquisition, and particularly relates to a dry electrode electroencephalogram acquisition device.

Background

The brain is an important component of the human central nervous system and is the material basis for all thought activities. It integrates, records, and responds to stimuli the information collected by human sense organs. Brain nerve activity is the manifestation of activities such as thinking and cognition in humans. There are various methods for detecting brain neural activity, among which an electroencephalogram (EEG) method is a method for directly recording the strength of an electric field in the brain using electrodes by using a discharge phenomenon during neural activity. The scalp electroencephalogram method adopts a non-invasive electrode to directly measure scalp electrical signals, and has the advantages of low price and high time resolution, so the method is widely used. EEG has been used for automatic detection of epilepsy, stroke patient treatment, depth of anesthesia detection, sleep staging and diagnosis and prognosis of various cerebrovascular diseases. Besides medical detection, EEG is also applied to life scenes such as smart homes, emotion recognition, fatigue detection and the like.

The dry electrode is easy to operate, and complex preparation work is not needed before experiments, so that the dry electrode is more and more applied to electroencephalogram related products. The existing in-ear electroencephalogram acquisition equipment adopts flexible conductive materials, such as conductive sponge, wire soft silica gel or conductive fabric, and the materials are complex in preparation process, high in cost and difficult to popularize. Domestic scholars propose a single ear conduction electroencephalogram signal acquisition device, but because human ear muscles are very sensitive, if the electrode size is too large, a user can have strong discomfort and even scratch the skin in the ear, and normal use is not facilitated. However, if the size is too small, the electrode cannot be in close contact with the skin in the ear, so that the system is difficult to acquire electroencephalogram signals in the ear, and the application and popularization of electroencephalogram equipment are greatly hindered.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides a dry electrode electroencephalogram acquisition device system, the size of an air bag can be changed by inflating and deflating the air bag, so that an electrode is fully contacted with the skin in the ear, and the acquisition of high-quality electroencephalogram signals is ensured. The specific technical scheme of the invention is as follows:

the dry electrode brain electricity collecting device is characterized by comprising an ear hook, an inflation assembly, a machine body box, an electrode and a signal processing circuit, wherein

The ear hook is encircled outside the machine body box and can be encircled from the upper side of the auricle to the lower side of the auricle through the back side of the auricle to fix the electroencephalogram acquisition device on the ear;

the inflation assembly comprises an air bag, an inflator, an inflation plug and an air pipe arranged between the air bag and the inflator, the inflation plug is provided with external threads which are matched with the internal threads of the inflator, and the volume of air entering the air bag through the air pipe is controlled by screwing in and screwing out the inflation plug;

the electrodes comprise a reference electrode and a dry electrode, and the reference electrode is fixed on the inner side of the ear hook and used for being connected with the outside of the ear to serve as a potential reference point; the dry electrode is a spring electrode, is wound outside the air bag through the self elasticity of the spring electrode, can change the self inner diameter along with the contraction and the relaxation of the air bag, and the root part of the dry electrode is connected to the signal processing circuit through a lead;

the signal processing circuit is positioned in the machine body box and comprises a signal conditioning module and a wireless sending module, the machine body box is connected with the grounding end of the signal conditioning circuit, and the machine body box is provided with a signal sending hole.

Furthermore, the dry electrode is made of spring steel, the electrode material is arranged on the spring in a point shape through micro machining, the root part of the dry electrode is connected to the signal processing circuit through a micro lead, and meanwhile, a plurality of paths of electroencephalogram signals are collected.

Furthermore, the dry electrode is made of spring steel, the surface of the dry electrode is integrally coated with electrode materials, and the root of the dry electrode is connected to the signal processing circuit through a lead to collect a single-path electroencephalogram signal.

Further, the electrode material is silver chloride or gold.

Further, the reference electrode is a spring probe.

Furthermore, the part of the air bag facing to the ear is provided with a sound through hole penetrating to the machine body box.

Furthermore, the signal conditioning module amplifies and filters the acquired electroencephalogram signals, and the wireless sending module transmits the acquired electroencephalogram signals to a lower computer or a cloud terminal through Bluetooth or wifi.

The invention has the beneficial effects that:

1. the signal collected by the system has low noise. The air bag structure meets auditory canals of different shapes and sizes, ensures that the electrodes are fully contacted with the skin in the ear, reduces contact resistance and is beneficial to acquiring high-quality electroencephalogram signals.

2. And is safer. The air bag plays a role in buffering and prevents the electrodes from scratching the skin.

3. The anti-electromagnetic field interference ability is strong. The design of the whole electromagnetic shielding cage can effectively shield the electromagnetic field interference in the space.

4. The use experience is good. The inner diameter of the dry electrode can be changed by only inflating the air bag, and the external sound is not hindered from being heard by a user while the electroencephalogram signals in the ears are collected.

5. The cost is low, compares in individual customization, more is fit for the demand of experiment and life.

Drawings

In order to illustrate embodiments of the present invention or technical solutions in the prior art more clearly, the drawings which are needed in the embodiments will be briefly described below, so that the features and advantages of the present invention can be understood more clearly by referring to the drawings, which are schematic and should not be construed as limiting the present invention in any way, and for a person skilled in the art, other drawings can be obtained on the basis of these drawings without any inventive effort. Wherein:

FIG. 1 is a schematic diagram of a dry electrode brain electrical acquisition device of the present invention before inflation;

FIG. 2 is a schematic diagram of a dry electrode brain electrical acquisition device of the present invention after inflation;

FIG. 3 is a schematic view of an inflatable assembly of a dry electrode brain electrical acquisition device of the present invention;

FIG. 4 is a schematic thread diagram of an inflation assembly of a dry electrode brain electrical acquisition device of the present invention;

fig. 5 is a schematic view of the connection of the ear hook to the body case according to one embodiment of the present invention.

The reference numbers illustrate:

1, hanging ears; 2-an inflation assembly; 21-air bag; 22-an inflator; 23-an inflation plug; 24-trachea; 3-a body box; 4-an electrode; 41-a reference electrode; 42-dry electrode; 5-a signaling aperture; 6-sound through hole.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

As shown in fig. 1-2, a dry electrode electroencephalogram acquisition device comprises an ear hook 1, an inflation assembly 2, a machine body box 3, an electrode 4 and a signal processing circuit (not shown), wherein the ear hook 1 is wound outside the machine body box 3 and can be wound from the upper side of an auricle to the lower side of the auricle through the back side of an auricle to fix the electroencephalogram acquisition device on the ear;

as shown in fig. 3-4, the inflation assembly 2 comprises an airbag 21, an inflator 22, an inflation plug 23 and an air tube 24 arranged between the airbag 21 and the inflator 22, wherein the inflation plug 23 is provided with external threads which are matched with the internal threads of the inflator 22, and the volume of air entering the airbag 21 through the air tube 24 is controlled by screwing in and out the inflation plug 23;

the electrode 4 comprises a reference electrode 41 and a dry electrode 42, wherein the reference electrode 41 is fixed on the inner side of the ear hook 1 and is used for connecting the outside of the ear as a potential reference point; the dry electrode 42 is a spring electrode, is wound outside the air bag 21 by the self elasticity of the spring electrode, can change the self inner diameter along with the contraction and the relaxation of the air bag 21, and the root of the dry electrode 42 is connected to a signal processing circuit (not shown) by a lead;

the signal processing circuit (not shown) is located inside the machine body box 3 and comprises a signal conditioning module and a wireless sending module, the machine body box 3 is connected with the grounding end of the signal conditioning circuit to form a Faraday electromagnetic shielding cage which can shield most external electromagnetic interference, and the machine body box is provided with 3 signal sending holes 5 which do not obstruct the sending of signals.

In some embodiments, the dry electrode 42 is made of spring steel, the electrode material is disposed on the spring in a point shape by micro-machining, and the root is connected to a signal processing circuit (not shown) by a micro-wire, and multiple electroencephalograms are collected at the same time.

In some embodiments, the electrode 42 is made of spring steel, the surface of the electrode is coated with electrode material, and the root of the electrode is connected to a signal processing circuit (not shown) through a lead wire to acquire a single electroencephalogram signal.

The electrode material is silver chloride or gold.

The reference electrode 41 is a spring probe that can be easily brought into contact with the ear without damaging the skin.

The part of the air bag 21 facing the ears is provided with the sound through hole 6 which penetrates through the machine body box 3, so that the user is not hindered from hearing outside sound while the electroencephalogram signals in the ears are collected.

The signal conditioning module amplifies and filters the acquired electroencephalogram signals, amplifies the electroencephalogram signals, simultaneously inhibits the interference of common-mode noise, filters non-electroencephalogram signals such as power frequency noise and the like, and simultaneously corrects the baseline drift. The wireless sending module transmits the acquired electroencephalogram signals to a lower computer or a cloud terminal through Bluetooth or wifi.

Fig. 5 shows a connection manner of the ear hook and the body case according to an embodiment of the present invention, and the ear hook 1 may be welded to the body case 3.

Before the electroencephalogram acquisition device is used, the air bag is in an uninflated state, has a small diameter, and can be conveniently inserted into an ear, as shown in figure 1. In use, the earplug is inserted to a suitable depth, then the air cell is inflated by rotating the inflation plug, and then the air cell is expanded and thickened, and simultaneously the spring electrode is pressed to be fully contacted with the skin in the ear, as shown in fig. 2. After use, the air is pumped out by rotating the inflation plug in the opposite direction, and the air bag is restored to the state before use, so that the air bag can be conveniently taken out from the ear.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, a first feature being "on," "above" or "over" a second feature includes the first feature being directly on or obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under", beneath and "under" a second feature includes the first feature being directly under and obliquely under the second feature, or simply means that the first feature is at a lesser elevation than the second feature.

In the present invention, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The dry electrode electroencephalogram acquisition device is characterized by comprising an ear hook (1), an inflation assembly (2), a machine body box (3), an electrode (4) and a signal processing circuit, wherein the signal processing circuit is connected with the ear hook

The ear hook (1) is fixedly wound outside the machine body box (3) and can be wound from the upper side of the auricle to the lower side of the auricle through the back side of the auricle to fix the electroencephalogram acquisition device on the ear;

the inflation assembly (2) comprises an air bag (21), an inflator (22), an inflation plug (23) and an air pipe (24) arranged between the air bag (21) and the inflator (22), wherein the inflation plug (23) is provided with external threads which are matched with the internal threads of the inflator (22), and the volume of gas entering the air bag (21) through the air pipe (24) is controlled by screwing in and screwing out the inflation plug (23);

the electrode (4) comprises a reference electrode (41) and a dry electrode (42), wherein the reference electrode (41) is fixed on the inner side of the ear hook (1) and is used for connecting the outside of the ear as a potential reference point; the dry electrode (42) is a spring electrode, is wound outside the air bag (21) through the self elasticity of the spring electrode, can change the self inner diameter along with the contraction and the relaxation of the air bag (21), and the root part of the dry electrode (42) is connected to the signal processing circuit through a lead;

the signal processing circuit is positioned in the machine body box (3) and comprises a signal conditioning module and a wireless sending module, the machine body box (3) is connected with the grounding end of the signal conditioning module, and the machine body box (3) is provided with a signal sending hole (5);

the dry electrode (42) is made of spring steel, the electrode material is arranged on the spring in a point or annular mode through micromachining, the root of the dry electrode is connected to the signal processing circuit through a micro-wire, and meanwhile, a plurality of paths of electroencephalogram signals are collected.

2. The dry electrode brain electrical acquisition device of claim 1, wherein the electrode material is silver chloride or gold.

3. The dry electrode brain electrical acquisition device according to claim 1, characterized in that the reference electrode (41) is a spring probe.

4. The dry electrode brain electricity acquisition device according to claim 1, characterized in that the part of the air bag (21) facing the ear is provided with a sound through hole (6) penetrating to the machine body box (3).

5. The dry electrode electroencephalogram acquisition device according to claim 1, wherein the signal conditioning module amplifies and filters the acquired electroencephalogram signals, and the wireless sending module transmits the acquired electroencephalogram signals to a lower computer or a cloud terminal through Bluetooth or wifi.