CN209269693U - For acquiring the flexible half dry type multilayered structure electrode of EEG signals - Google Patents
For acquiring the flexible half dry type multilayered structure electrode of EEG signals Download PDFInfo
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- CN209269693U CN209269693U CN201820821384.7U CN201820821384U CN209269693U CN 209269693 U CN209269693 U CN 209269693U CN 201820821384 U CN201820821384 U CN 201820821384U CN 209269693 U CN209269693 U CN 209269693U
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Abstract
The utility model belongs to medical instrument and wearable electronic product, for the flexible half dry type multilayered structure electrode for acquiring EEG signals, including flexible electrode body layer, foamed cotton layer and reserve liquid layer；Flexible stylet in the flexible electrode body layer is array-type sensor structure；Several through-holes for being used to penetrate flexible stylet are set on the conducting foam in foamed cotton layer, and several through-holes and flexible stylet arrangement are consistent；Electrolyte is stored in reserve liquid layer, and is equipped with the release component for being discharged into electrolyte on the conducting foam in foamed cotton layer.Flexible electrode provided by the utility model has the advantages that easy to use, comfortable, structurally reasonable, impedance is low, long time stability, flexibility, wearing comfort safety.
Description
Technical field
The utility model relates to be applied to the electrode of medical instrument and wearable electronic product, and in particular to one kind is covered on
Hair zones are used to acquire the flexible half dry type multilayered structure electrode of EEG signals.
Background technique
EEG signals (EEG) are a kind of electrophysiological indexs for recording brain activity, are the prominent of the synchronous generation of a large amount of neurons
Current potential is formed through summation after touch, can reflect the information such as health status, the cognitive activities of human body, is brain science research, human body life
The important parameter of reason research and cerebral disease clinical diagnosis is applied to medicine detection, clinical diagnosis and brain-computer interface more and more
Field provides diagnostic message for the brain diseases such as dementia, epilepsy, tumour or brain death.Traditional wet electrode is low because of impedance and believes
Number stabilization is widely used in clinical and scientific research, but while using wet electrode is cumbersome, needs to coat Signa Gel and carries out skin
Skin pretreatment, is easy to make the hair of subject and clothes dirty, and using the time, Signa Gel will be dehydrated shortly after, be led
The number of writing bad stability, uses and is inconvenient, and seriously limits the brain electricity application under general environment.
With the development of portable medical and health monitoring, dry electrode technology has obtained the extensive pass of scientific research personnel in recent years
Note, the dry electrode based on Different electrodes material and structure are correspondingly proposed.Dry electrode is not needed in use using leading
Coagulation glue, due to its convenient and efficient ideal substitute for becoming traditional wet electrode with long-time stability.But these dry electrodes exist
There is the disadvantages of such as contact impedance is higher, electrode sensitive to motion artifacts causes firmly using discomfort very much in use process.
Some researchs are based on the half-dried electrode of porous post design at present, but porous permeable column is usually rigid material, is existed
Wear uncomfortable disadvantage.
With the arriving in intelligence wearing epoch, the electrode technology of existing hair overlay area is difficult to meet under general environment
Brain wave acquisition requirement.
Summary of the invention
For deficiency present in existing hair overlay area electrode measurement technology, the utility model is provided for acquiring brain
The flexible half dry type multilayered structure electrode of electric signal, the flexible half dry type electrode based on the design of multi-functional hierarchical structure have operation
It is simple and convenient, contact impedance is low, noise is low, using it is comfortable the advantages that.
The utility model is used to acquire the flexible half dry type multilayered structure electrode of EEG signals, including flexible electrode ontology
Layer, foamed cotton layer and reserve liquid layer；Flexible stylet in the flexible electrode body layer is array-type sensor structure；In foamed cotton layer
Several through-holes for being used to penetrate flexible stylet are set on conducting foam, and several through-holes and flexible stylet arrangement are consistent；In reserve liquid layer
Electrolyte is stored, and is equipped with the release component for being discharged into electrolyte on the conducting foam in foamed cotton layer.
Preferably, the flexible stylet is using the flexible conducting material production based on silica gel.The flexibility based on silica gel
Conductive material adds carbon conductive filler or me tallic conductive filler.
Preferably, the reserve liquid layer includes the liquid storage tank being embedded among flexible electrode body layer；The release component is position
Below the liquid storage tank, several direct holes for being uniformly distributed in above foamed cotton layer.
Preferably, the reserve liquid layer further includes check valve and through-hole；Check valve setting is in liquid storage tank upper surface or surveys end face,
And it is connect with the through-hole of reserve liquid layer；The through-hole of reserve liquid layer is connected to liquid storage tank.
Preferably, described for acquire the flexible half dry type multilayered structure electrode of EEG signals to further include circuit layer, liquid storage
Layer further includes interface unit；The collected EEG signals of flexible electrode body layer are sent into electricity as signal input part by interface unit
Road floor is handled；The circuit layer reduces scalp and described for acquiring brain electricity using high input high impedance buffer amplifier
Equivalent contact impedance between the flexible half dry type multilayered structure electrode of signal.
Preferably, the flexible electrode body layer, preparation process include the following steps:
(1) threedimensional model of flexible electrode ontology is designed, which includes flat laminated structure, and flat from this
Several cones that flat one surface of laminated structure extends out；Hollow design is used inside the flat laminated structure；
(2) carbon conductive filler or me tallic conductive filler are adulterated in silica gel, are prepared into electric silica gel；
(3) 3D printing technique is utilized, according to the threedimensional model that step (1) is designed, is beaten with electric silica gel prepared by step (2)
Print standby flexible electrode ontology；
The carbon conductive filler is one of carbon black, carbon nanotube and graphene or a variety of；The metal system is conductive
Filler is that silver powder, aluminium is silver-plated and one of nickel powder or a variety of.
As can be known from the above technical solutions, the utility model is based on flexible conductive composite material ontology and proposes that multi-functional level is soft
Property electrode structural designs, including four-layer structure: flexible electrode body layer, foamed cotton layer, reserve liquid layer and circuit layer.Flexible electrode ontology
Layer is the flexible needle sensor designed based on flexible conducting material；Foamed cotton layer is mainly made of conducting foam, for releasing
Electrolyte is put to reduce the contact impedance between electrode and scalp；Reserve liquid layer is designed using hollow type, electrolyte is stored, to protect
Card foam can moisten for a long time；And circuit layer includes active amplifying circuit, reduces noise, to obtain more stable brain telecommunications
Number.The flexible half dry type electrode that the utility model is designed based on multi-functional hierarchical structure, compared to traditional eeg signal acquisition
Electrode technology, it is advantageous that:
1. electrode body passes through foam sponge layer and contacts with the skin of head of subject, so that the electrolyte in foam be made to be discharged into
Skin of head, to reduce the contact impedance between scalp and electrode；And the moisture preserving time of foam is permanent, it can long period release electricity
It solves on liquid to electrode body.
2. the electrolyte or conduction liquid that are stored in liquid storage tank pass through the capillary aperture slow release of direct hole, inhaled by foam
It receives, moistens skin of head more efficiently, more permanently reduce the contact impedance between electrode and scalp, improve conventional dry electrode and connect
Interface is touched, the preferable EEG signals of quality are obtained, using simple, comfortable.
3. electrode body is made of flexible material, during contacting with brain scalp, it will greatly mitigate subject
Sense of discomfort；The design of probe-type can pass through hair and directly contact scalp.
4. using preposition active circuit, the interference being subject in detection process is reduced, improves signal quality.
Detailed description of the invention
Fig. 1 is one of the overall structure diagram of the utility model first embodiment；
Fig. 2 is the two of the overall structure diagram of the utility model first embodiment；
Fig. 3 is the utility model flexible electrode ontology schematic diagram；
Fig. 4 is conducting foam layer schematic diagram；
Fig. 5 is schematic diagram in the middle part of flexible electrode ontology；
Fig. 6 is flexible electrode ontology top view；
Fig. 7 is the connection schematic diagram of flexible electrode ontology and circuit layer；
Fig. 8 is circuit layer active circuit figure；
Fig. 9 is the structural schematic diagram of the utility model second embodiment.
Specific embodiment
The utility model is described in detail below in conjunction with specific embodiment and Figure of description.Following embodiment will have
Help those skilled in the art and further understands the utility model.But the embodiments of the present invention is without being limited thereto.
Embodiment 1
As shown in Figure 1, the present embodiment provides a kind of for acquiring the flexible half dry type multilayered structure electrode of EEG signals, wrap
Include flexible electrode body layer 1, foamed cotton layer 2, reserve liquid layer 3, circuit layer 4 and Electricity Federation device 5.
As shown in Fig. 2, 1.1 be the flexible stylet in flexible electrode body layer, using based on silica gel in this embodiment
Flexible conducting material production, carbon conductive filler such as carbon black, carbon nanotube, graphene etc. or me tallic conductive filler can be added
Such as silver powder, aluminium is silver-plated, one of nickel powder or a variety of.As shown in Figure 3；Therefore when contacting with scalp, shouting pain will not be generated
Sense, and it is resistant to pressure.Flexible stylet uses array-type sensor structure, and probe shape is designed as cone, and the length of probe is
8-10mm, more preferably to pass through hair and brain skin contact.
Conductive sponge on foamed cotton layer 2 is made by polymer composite foaming technique, and foaming aperture is uniform, soft
Soft, high resilience, while having the function of water suction.Such as Fig. 4, conducting foam is circle using dismountable stand alone type design, shape
Shape, it is consistent with electrode body surface size, it is highly 6-8mm.It is arranged on conducting foam several for penetrating flexible stylet
Through-hole, and it is consistent with the probe arrangement on flexible electrode ontology, i.e., and probe can pass through conducting foam just.Specific experiment process
In, conducting foam is other than it can discharge the contact impedance that electrolyte reduces between scalp-electrode, moreover it is possible to play alleviation contact not
Suitable effect.
Reserve liquid layer 3 includes liquid storage tank 3.1, direct hole 3.2, check valve 3.3, through-hole 3.4 and interface unit 3.5；Liquid storage tank
For cuboid, and it is embedded among flexible electrode body layer；Direct hole 3.2 is located at below liquid storage tank, is uniformly distributed in foamed cotton layer 2
Top is set as 5 in the present embodiment, diameter 1-2mm, such as Fig. 5；Check valve 3.3 is arranged in liquid storage tank upper surface, and and through-hole
3.4 connections, through-hole 3.4 are connected to liquid storage tank, such as Fig. 6.Check valve 3.3 is opened when use, by through-hole 3.4 to liquid storage tank 3.1
The electrolyte such as saline injection, the aperture of through-hole are about 10mm.Interface unit 3.5 with circuit layer 4 for connecting, in this embodiment
Interface unit is box and pin, including pin thread 3.5.1 and female thread 3.5.2, is connected with conductive metal by electrode body upper is buckled in
End is that circuit layer can carry out in use using the advantages of interface unit to form electrical interconnecting means, i.e. pin thread 3.5.1
Disassembly, as shown in Figure 7；Interface unit 3.5 is used as signal input part by the collected EEG signals of flexible electrode body layer simultaneously
It is sent into circuit layer, rear end is output to by the interface unit of circuit layer 5 after active circuit and carries out next step amplification.Real process
Among the acquisitions of EEG signals can also be directly carried out using flexible half-dried electrode without using active circuit layer.
Circuit layer 4 is circuit board PCB, can be effectively reduced using height input high impedance buffer amplifier with reducing noise
Equivalent contact impedance between scalp and electrode improves the signal-to-noise ratio of electrode, improves electrode and resists Electromagnetic Interference movement and line
The abilities such as cable interference, to reduce the decaying of signal, phase distortion and increase common-mode rejection ratio.Physical circuit figure is as shown in Figure 8.
Height input high impedance buffer amplifier includes operational amplifier, the electrode input end series resistance R1 of operational amplifier, output end
It is connect with negative input；The output end of operational amplifier exports the defeated of high input high impedance buffer amplifier after resistance R2
Out.Wherein, existing chip LMP7701MF can be used in operational amplifier.
Wherein, the preparation process of flexible electrode body layer, mainly includes the following steps:
(1) threedimensional model of flexible electrode ontology is designed, which includes flat laminated structure, and flat from this
Several cones that flat one surface of laminated structure extends out.Hollow design is used inside the flat laminated structure.
(2) carbon conductive filler or me tallic conductive filler are adulterated in silica gel, are prepared into electric silica gel.Wherein, carbon system
Conductive filler is one of carbon black, carbon nanotube and graphene or a variety of；Me tallic conductive filler is silver powder, aluminium is silver-plated and nickel
One of powder is a variety of.
(3) 3D printing technique is utilized, according to the threedimensional model that step (1) is designed, is beaten with electric silica gel prepared by step (2)
Print standby electrode body.Electrode body layer can also be prepared using traditional model placingJi Shu.
When in use, conductive sponge and PCB circuit board are removed first, and conductive sponge is soaked, flexible electrical in connection
Pole ontology, then by through-hole electrolyte such as saline injection into liquid storage tank, check valve 3.3 is opened when water filling, stops note
Check valve 3.3 is closed when water, is finally installed PCB circuit board and is tested.
Example applies 2
It also include flexible electrical as shown in figure 9, acquiring the flexible half dry type multilayered structure electrode of EEG signals in the present embodiment
Pole body layer 1, foamed cotton layer 2, reserve liquid layer 3, circuit layer 4 and Electricity Federation device 5；From example apply circuit layer unlike 1 and reserve liquid layer,
Connection type between flexible electrode body layer is changed to integral type, does not use detachable structure.At the same time, check valve 3.3
The side of flexible electrode body layer is set with through-hole 3.4.Foamed cotton layer is removed first when use and is slightly soaked, then by electrode
The body layer side opposite with check valve 3.3 is affixed on ground, is electrolysed by through-hole 3.4 to 3.1 saline injection of liquid storage tank etc.
Liquid.
Above-described embodiment is the preferable embodiment of the utility model, but the embodiments of the present invention is not by above-mentioned
The limitation of embodiment, it is made under other any spiritual essence and principles without departing from the utility model to change, modify, replacing
In generation, simplifies combination, should be equivalent substitute mode, is included within the protection scope of the utility model.
Claims (9)
1. for acquiring the flexible half dry type multilayered structure electrodes of EEG signals, which is characterized in that including flexible electrode body layer,
Foamed cotton layer and reserve liquid layer；Flexible stylet in the flexible electrode body layer is array-type sensor structure；Leading in foamed cotton layer
Several through-holes for being used to penetrate flexible stylet are set on electric foam, and several through-holes and flexible stylet arrangement are consistent；Storage in reserve liquid layer
Electrolyte is deposited, and is equipped with the release component for being discharged into electrolyte on the conducting foam in foamed cotton layer.
2. according to claim 1 for acquiring the flexible half dry type multilayered structure electrode of EEG signals, which is characterized in that
The flexible stylet is using the flexible conducting material production based on silica gel.
3. according to claim 2 for acquiring the flexible half dry type multilayered structure electrode of EEG signals, which is characterized in that
The flexible conducting material addition carbon conductive filler or me tallic conductive filler based on silica gel.
4. according to claim 3 for acquiring the flexible half dry type multilayered structure electrode of EEG signals, which is characterized in that
The carbon conductive filler is one of carbon black, carbon nanotube and graphene or a variety of；The me tallic conductive filler is silver
Powder, aluminium is silver-plated and one of nickel powder or a variety of.
5. according to claim 1 for acquiring the flexible half dry type multilayered structure electrode of EEG signals, which is characterized in that
The shape of the flexible stylet is cone, and the length of flexible stylet is 8-10mm；The conducting foam height is 6-8mm.
6. according to claim 1 for acquiring the flexible half dry type multilayered structure electrode of EEG signals, which is characterized in that
The reserve liquid layer includes the liquid storage tank being embedded among flexible electrode body layer；The release component is below liquid storage tank,
The even several direct holes being distributed in above foamed cotton layer.
7. according to claim 6 for acquiring the flexible half dry type multilayered structure electrode of EEG signals, which is characterized in that
The diameter of the direct hole is 1-2mm.
8. according to claim 6 for acquiring the flexible half dry type multilayered structure electrode of EEG signals, which is characterized in that
The reserve liquid layer further includes check valve and through-hole；Check valve setting is in liquid storage tank upper surface or surveys end face, and logical with reserve liquid layer
Hole connection；The through-hole of reserve liquid layer is connected to liquid storage tank.
9. according to claim 1 for acquiring the flexible half dry type multilayered structure electrode of EEG signals, which is characterized in that
It is described for acquire the flexible half dry type multilayered structure electrode of EEG signals to further include circuit layer, reserve liquid layer further includes connector
Part；The collected EEG signals of flexible electrode body layer are sent into circuit layer as signal input part and handled by interface unit；
The circuit layer reduces scalp and the flexibility for acquiring EEG signals is half-dried using high input high impedance buffer amplifier
Equivalent contact impedance between formula multilayered structure electrode.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108652620A (en) * | 2018-05-30 | 2018-10-16 | 华南理工大学 | Flexible half dry type multilayered structure electrode for acquiring EEG signals |
| CN111419229A (en) * | 2020-03-17 | 2020-07-17 | 上海交通大学 | Quasi-dry electrode for electroencephalogram acquisition and preparation method thereof |
| CN113456080A (en) * | 2021-05-25 | 2021-10-01 | 北京机械设备研究所 | Dry-wet universal sensing electrode and application method thereof |
-
2018
- 2018-05-30 CN CN201820821384.7U patent/CN209269693U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108652620A (en) * | 2018-05-30 | 2018-10-16 | 华南理工大学 | Flexible half dry type multilayered structure electrode for acquiring EEG signals |
| CN111419229A (en) * | 2020-03-17 | 2020-07-17 | 上海交通大学 | Quasi-dry electrode for electroencephalogram acquisition and preparation method thereof |
| CN113456080A (en) * | 2021-05-25 | 2021-10-01 | 北京机械设备研究所 | Dry-wet universal sensing electrode and application method thereof |
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