CN108567425A - A kind of wearable acquiring biological electric signals helmet - Google Patents
A kind of wearable acquiring biological electric signals helmet Download PDFInfo
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- CN108567425A CN108567425A CN201810300873.2A CN201810300873A CN108567425A CN 108567425 A CN108567425 A CN 108567425A CN 201810300873 A CN201810300873 A CN 201810300873A CN 108567425 A CN108567425 A CN 108567425A
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- electrode
- wearable
- electric signals
- acquiring biological
- biological electric
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- 238000005516 engineering process Methods 0.000 description 10
- 210000003128 head Anatomy 0.000 description 9
- 210000004556 brain Anatomy 0.000 description 8
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- 239000003292 glue Substances 0.000 description 4
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- 229910002027 silica gel Inorganic materials 0.000 description 2
- SDLBJIZEEMKQKY-UHFFFAOYSA-M silver chlorate Chemical compound [Ag+].[O-]Cl(=O)=O SDLBJIZEEMKQKY-UHFFFAOYSA-M 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- -1 Advantage is to wear Chemical compound 0.000 description 1
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/369—Electroencephalography [EEG]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/25—Bioelectric electrodes therefor
- A61B5/279—Bioelectric electrodes therefor specially adapted for particular uses
- A61B5/291—Bioelectric electrodes therefor specially adapted for particular uses for electroencephalography [EEG]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6802—Sensor mounted on worn items
- A61B5/6803—Head-worn items, e.g. helmets, masks, headphones or goggles
Abstract
The invention discloses a kind of wearable acquiring biological electric signals helmet, including periphery retainer plate, the band that rigidly fixes component and can adjust；The component that rigidly fixes is equipped with several electrode mounting holes, and band card slot is equipped on the outside of the electrode mounting hole；The periphery retainer plate card slot is connect by adjustable headband with the band card slot of electrode fixing holes periphery；The electrode is fixed on electrode mounting hole；The periphery retainer plate is additionally provided with slack adjuster.The device uses modularized design, is formed with the strips mosaic that can be adjusted using component is rigidly fixed, and is equipped with elastic adjusting knob, can be suitble to the eeg recording of different head circumference subjects, while electrode can be maintained to stablize with skin contact to be measured again, and signal record is reliable.
Description
Technical field
The present invention relates to a kind of wearable acquiring biological electric signals helmets, belong to bioelectrical signals detection, transmission technology
Field is particularly suitable for EEG signals record.
Background technology
Common bioelectrical signals mainly have electrocardio, brain electricity, myoelectricity etc., these body surface bioelectrical signals can usually pass through electricity
Pole records, and amplifies through bioelectric amplifier appropriate, record and become electrocardiogram, electroencephalogram, electromyogram etc..Brain electricity（EEG）It is
A kind of common bioelectrical signals, it is obtained big using the variation of the neuropotential pattern measurement brain electrical signals of brain activity
Brain function information, advantage are temporal resolution height.EEG can be divided mainly into two kinds of intrusive EEG and non-intrusion type EEG.It invades
Although it is high to enter formula EEG spatial resolutions, there is damage to subject, it is difficult to practical.Therefore non-intrusion type EEG is at present using most
It is extensive.With the fast development of the emerging technologies such as big data, cloud computing, portable medical, expedites the emergence of and be based on real life scenarios
Brain electricity application.The application of real life scenarios brain electricity does not require nothing more than that signal is reliable, and more focuses on the convenience used and relax
Adaptive.
The prior art mainly uses wet electrode technology, that is, needs to use conductive paste（Glue）Electrode technology.Although wet electrode
Signal stabilization is reliable, but conducting resinl and skin need to be used to pre-process, and complicated to take, subject feels uncomfortable.Conducting resinl can be made dirty
The hair of subject needs to wash hair after record.Therefore, wet electrode is difficult to apply to the eeg recording of real life scenarios.In order to gram
Wet electrode inconvenience, uncomfortable problem are taken, has developed dry electrode technology in recent years.Dry electrode refers to any completely without using
Additional electrolyte, electronic conductor directly with the electrode technology of skin contact.Therefore dry electrode installation is quick, easy to use, but by
In unstable with skin contact, signal quality is poor.Electrode supporting structure is most important, it directly affects electrode and skin contact
Stability.Development Energy and comfort and the electrode supporting structure that can stablize with skin contact be the key that break through dry electrode technology it
One.
Prior art electrode support construction is broadly divided into elastic support structure, two class of rigidity supporting structure.Resilient support knot
Structure main representative is the electrode cap made of elastic fabric, and major advantage has elasticity, same electrode cap preferable with skin attachement
The different subject wears of multiple head dummys can be met to require, disadvantage can not exactly ensure electrode uniform force, not with skin contact
Stablize, impedance is unstable.The main representative of rigidity supporting structure is headband or the helmet made of duroplasts or hard silica gel, mainly
Advantage is to wear, pick and place conveniently, but having the following disadvantages：（1）Due to not having elasticity, cannot meet multiple and different head dummys by
The wearing requirement of examination person；（2）Since human head profile is irregular, rigidity supporting structure itself is bad with skin attachement, therefore
Electrode is also susceptible to skin to be contacted bad, and electrode number is more to be become apparent；（3）This rigidity supporting structure is confined to
3-5 conductive electrodes far can not meet the needs of the applications such as medical treatment, psychological cognition.
Invention content
It is an object of the present invention to overcome the deficiencies of existing technologies, a kind of wearable acquiring biological electric signals dress is provided
It sets, it is reasonable for structure, it is fixed, stabilization is contacted between electrode and skin, reduces electrode-skin impedance, while being suitble to again not
With the eeg recording of head circumference subject.
The technical scheme is that：
A kind of wearable acquiring biological electric signals helmet, including periphery retainer plate, the band that rigidly fixes component and can adjust；
The component that rigidly fixes is equipped with several electrode mounting holes, and band card slot is equipped on the outside of the electrode mounting hole；It is described
Periphery retainer plate card slot connect with the band card slot of electrode fixing holes periphery by the headband that can be adjusted；The electrode is fixed
In in electrode mounting hole.
Further technical solution is as follows：
The wearable acquiring biological electric signals helmet, periphery retainer plate are additionally provided with slack adjuster.
The both ends of the wearable acquiring biological electric signals helmet, periphery retainer plate are equipped with gear member, described
Slack adjuster is knob, by the degree of overlapping of knob adjustment gear part to realize elastic adjusting.
The wearable acquiring biological electric signals helmet, rigidly fix component at least there are two.
The wearable acquiring biological electric signals helmet, rigidly fix component by the band that can adjust with it is another
Rigidly fix component connection.
The wearable acquiring biological electric signals helmet, outside the same Different electrodes mounting hole for rigidly fixing component
It can also be connected by the headband that can be adjusted between the band card slot of side.
The wearable acquiring biological electric signals helmet, it is in vertical or horizontal headband shape to rigidly fix component, or
Person is in be woven into a mesh structure in length and breadth.
The wearable acquiring biological electric signals helmet, electrode are half-dried electrode or dry electrode, the electrode
It is connect with electrode mounting hole by screw thread.
The wearable acquiring biological electric signals helmet, half-dried electrode include electrode body, electrode slice, electrode tip holder,
Ion infiltration end connects core with jointing holes；The electrode body lower end is equipped with electrode cavity, and the electrode slice is located in electrode cavity
Top surface；The ion permeates end end thereof contacts electrode slice, and the other end exposes from electrode tip holder lower face, when using as electrode and
The contact surface of skin；The electrode tip holder is detachably connected by way of clamping with electrode cavity formation；The electrode slice with
Jointing holes connect core electrical connection.
The wearable acquiring biological electric signals helmet, dry electrode includes electrode body and electrode tip；The electricity
Polar body is internally provided with electrode cavity, and spring is partly cased on the electrode tip, can in electrode cavity elastic telescopic.
The wearable acquiring biological electric signals helmet, electrode upper end are equipped with hand-held part, are equipped among hand-held part
Electrode terminal, external circuit are connected by cellular type plugging mode.
The wearable acquiring biological electric signals helmet, the band that can be adjusted at least one end are equipped with velcro, lead to
Cross the length of velcro adjustment bar band.
The wearable acquiring biological electric signals helmet, rigidly fixes and is additionally provided with wireless amplifier on component.
The effective significant effect of wearable biological electrical signal collecting device provided by the invention：
The wearable acquiring biological electric signals helmet provided by the invention, using the strips mosaic that rigidly fixes component and can adjust
At, and it is equipped with elastic adjusting knob, this local stiffness local compliance structure can be suitble to the eeg recording of different head circumference subjects,
It can give electrode certain pressure again simultaneously, electrode is maintained to stablize with skin contact to be measured, signal record is reliable.Using modularization
Design rigidly fixes component and adjustable headband connecting method freedom, can be realized by adjusting the quantity for rigidly fixing component
The increase and decrease of electrode number, to meet the needs of different brain electricity applications.Using half-dried electrode or dry electrode, avoid using conduction
Glue is more convenient comfortable.In addition, the mode being connected through a screw thread can adjust the height of electrode, electrode is thereby further ensured that
Stablize with skin contact.
Description of the drawings
Fig. 1 is a kind of front view of the wearable acquiring biological electric signals helmet of the present invention.
Fig. 2 is the structure chart of knob slack adjuster.
Fig. 3 is to rigidly fix component by adjustable headband and periphery retainer plate connection diagram, the one of adjustable straps band
End is equipped with velcro.
Fig. 4 is that electrode is half-dried electrode, and the mode of being connected through a screw thread realizes the schematic diagram of the adjustment of electrode height.
Fig. 5 is that electrode is dry electrode, and the schematic diagram of electrode tip elastic telescopic in electrode cavity is realized by spring.
It is respectively marked in attached drawing entitled：1-periphery retainer plate, 1.1-periphery retainer plate card slots, 2-rigidly fix component,
2.1-electrode layers, 2.2-headband card slots, 3-adjustable straps bands, 4-electrodes, 4.1-electrode tips, 4.2-electrode slices,
4.3-4.4-ions of electrode tip holder permeate end, and 4.5-jointing holes connect core, 4.6-electrode tips, 4.7-springs, 5-elastic tune
Regulating device, 6-screw threads, 7-connecting lines patch end, 8-wireless amplifiers, 9-velcro, 10-jointing holes.
Specific implementation mode
Invention is further described in detail below in conjunction with the accompanying drawings.
Embodiment 1：It is the basic embodiment of the present invention.Picture 1-4, a kind of wearable acquiring biological electric signals head
Helmet, including periphery retainer plate 1, the band 3 that rigidly fixes component 2 and can adjust；Described rigidly fixes component 2 equipped with several
Electrode mounting hole 2.1,2.1 outside of the electrode mounting hole is equipped with band card slot 2.2；The periphery retainer plate card slot
1.1 headband 3 by that can adjust is connect with the band card slot 2.2 of electrode fixing holes periphery；The electrode 4 is fixed on electrode peace
It fills in hole 2.1.Elastic support structure or rigidity supporting structure compared to the prior art, the acquiring biological electric signals helmet use mould
Blockization designs, by the band that can adjust with rigidly fix component, periphery retainer plate is spliced, to form local stiffness office
The flexible adjustable support construction in portion.Advantage is can be suitble to the eeg recording of different head circumference subjects, while can give electrode one again
Fixed pressure maintains electrode to stablize with skin contact to be measured, and signal record is reliable.In addition, using modularized design, electrode position
It is adjusted with quantity more flexible, can move or increase and decrease and rigidly fix component and realize the diversified acquisition helmet, to meet difference
The demand of brain electricity application.
Embodiment 2：It is further embodiment of the present invention.As shown in Fig. 2, the periphery retainer plate 1 be additionally provided with it is elastic
Regulating device 5.The both ends of the periphery retainer plate are equipped with gear member 1.2, and the slack adjuster 5 is knob, knob
Two panels gear member 1.2 is clamped, by the degree of overlapping of knob adjustment gear part to realize elastic adjusting.Advantage is that harvester can
It is suitble to different subjects, increases the compactness of harvester and skin, and electrode can be maintained to stablize with skin contact.When the pine
Tight regulating device is that the band that can be adjusted replaces, then belongs to equivalent embodiment, because can equally be risen by the band that can be adjusted
The effect elastic to adjusting periphery retainer plate.
Embodiment 3：It is further embodiment of the present invention.As shown in figure 3, the wearable acquiring biological electric signals
The helmet, rigidly fix component 2 at least there are two.The component 2 that rigidly fixes passes through the band 3 that can be adjusted and in addition rigid
Property fixation kit 2 connect, so that multiple rigid anchors are stitched together.The same Different electrodes for rigidly fixing component
It can also be connected by adjustable headband 3 between the band card slot 2.2 in 2.1 outside of installation.The component 2 that rigidly fixes is in
Vertical or horizontal headband shape, or in being woven into a mesh structure in length and breadth, electrode mounting hole 2.1 is by world 10-20 positioning systems point
It is distributed in these rigid anchors.The component that rigidly fixes that these longitudinally oriented strips are band-like, Cross slat is band-like, network-like between each other may be used
To carry out series connection splicing by energy adjustment bar band, to form the acquisition helmet of multiplicity, to meet the brain of different demands
Electrographic recording requirement.
Embodiment 4：It is further embodiment of the present invention.The wearable acquiring biological electric signals helmet, electricity
Pole 4 is half-dried electrode.As shown in figure 4, the half-dried electrode includes electrode body 4.1, electrode slice 4.2, electrode tip holder 4.3, ion
Infiltration end 4.4 connects core 4.5 with jointing holes.The electrode body lower end is equipped with electrode cavity, and the electrode slice 4.2 is located at electrode
Top surface on chamber；The ion permeates 4.4 end thereof contacts electrode slice 4.2 of end, and the other end exposes from 4.3 lower face of electrode tip holder, makes
Contact surface of the used time as electrode and skin；The electrode tip holder 4.3, which is formed by way of clamping with electrode cavity, detachably to be connected
It connects；The electrode slice connect the electrical connection of core 4.5 with jointing holes.This half-dried electrode is discharged micro by ion infiltration end 4.4
Electrolyte substitute the electrode technology of conducting resinl, the advantages of it has both wet electrode and dry electrode, both solved conducting resinl injecting glue and lane
The problem of dirty hair, while there is preferable signal quality again.In addition electrode tip holder 4.3 is convenient for assembly using dismountable connection；
Ion infiltration end 4.4 can be used as medical disposable material use, relatively sanitary cleaning.The electrode is pacified by screw thread 4.6 and electrode
Hole connection is filled, had not only facilitated the assembly of electrode, but also adjustable height, to maintain half-dried electrode to stablize with skin contact.
Embodiment 5：It is further embodiment of the present invention.The wearable acquiring biological electric signals helmet, electricity
Pole 4 is dry electrode.As shown in figure 5, dry electrode includes electrode body 4.1 and electrode tip 4.6；The electrode body is internally provided with electrode
Chamber is partly cased with spring 4.7 on the electrode tip 4.6, can in electrode cavity elastic telescopic.This dry electrode is without making
Very easy to use with any additional electrolyte, assembly is quick.At this point, dry electrode is threadably secured to general height first,
Electrode is maintained to be contacted with scalp.The elastic telescopic of contained spring can further be finely adjusted electrode height, to preferably tie up
It is good with skin contact to hold electrode, electrode-skin impedance is greatly reduced, improves signal and records quality.Pass through dual regulation, the helmet
The eeg recording that the subject of insufficient head circumference can be met ensures that all record site contacts are stablized.
Embodiment 6：It is further embodiment of the present invention.Such as Fig. 1,4 upper end of electrode is equipped with hand-held part 4.6, hand
It holds and is equipped with jointing holes among portion, there are jointing holes to connect core 4.5 inside jointing holes, external circuit is connected by cellular type plugging mode.Into
One step, 2.1 periphery of electrode mounting hole are additionally provided with spliced eye 10, and the end 7 that patches of connecting line is inserted by when use respectively
The jointing holes of hand-held part and with electrode install periphery jointing holes in, external circuit is hidden in rigid fastener components bottom surface, facilitates electrode
Installation and removal, it is more beautiful.
Embodiment 7：It is further embodiment of the present invention.Described at least one end of band 3 that can be adjusted is equipped with velcro
9, electrode and skin contact are maintained to make harvester that different head circumferences is suitble to be tested by the length of 9 adjustment bar band of velcro
Stablize, reduce electrode-skin impedance, improves signal quality.
Embodiment 8：It is further embodiment of the present invention.Described rigidly fixing is additionally provided with wireless amplifier on component 2
8, wireless amplifier 8 is removably secured wireless amplifier and fixes in support, and this wireless acquisition device is suitble to daily life scene
Eeg recording such as move, rehabilitation, game.
Embodiment 9：It is further embodiment of the present invention.2 material of component that rigidly fixes is plastics or nylon system
At the energy adjustment bar band 3 is made of elastic fabric, elastic silica gel, the one or more of elastic rubber.The electrode slice
It is preferred that fine silver or fine silver plating silver chlorate or silver/silver chlorate powder electrode piece.The ion permeates the preferred foam in end, water-setting
One kind of glue, polymer absorbent material.
The above embodiment of the present invention, only exemplary further explanation technical solution, principle and application and effect etc. are right
For those skilled in the art, without departing from the concept of the premise of the invention, several deformations can also be made
And improvement, these are all within the scope of protection of the present invention.That is, the present invention claims be not limited to it is above-mentioned
Embodiment.
Claims (13)
1. a kind of wearable acquiring biological electric signals helmet, which is characterized in that including periphery retainer plate（1）, rigidly fix group
Part（2）With the band that can be adjusted（3）；Described rigidly fixes component（2）Equipped with several electrode mounting holes（2.1）, described
Electrode mounting hole（2.1）Outside is equipped with band card slot（2.2）；The periphery retainer plate card slot（1.1）Pass through adjustable straps band
（3）With the band card slot of electrode fixing holes periphery（2.2）Connection；The electrode（4）It is fixed on electrode mounting hole（2.1）.
2. the wearable acquiring biological electric signals helmet according to claim 1, which is characterized in that the periphery is fixed
Circle（1）It is additionally provided with slack adjuster（5）.
3. the wearable acquiring biological electric signals helmet according to claim 1, which is characterized in that the periphery is fixed
The both ends of circle are equipped with gear member（1.2）, the slack adjuster（5）For knob, pass through the overlapping of knob adjustment gear part
Degree is to realize elastic adjusting.
4. the wearable acquiring biological electric signals helmet according to claim 1, which is characterized in that described rigidly fixes
Component（2）There are two at least.
5. the wearable acquiring biological electric signals helmet according to claim 4, which is characterized in that described rigidly fixes
Component（2）Pass through the band that can be adjusted（3）Component is rigidly fixed with another（2）Connection.
6. the wearable acquiring biological electric signals helmet according to claim 1, which is characterized in that the same rigidity
Fixation kit（2）Electrode mounting hole on the outside of band card slot（2.2）Between can also be by the headband that can adjust（3）Connection.
7. the wearable acquiring biological electric signals helmet according to claim 1, which is characterized in that described rigidly fixes
Component（2）In vertical or horizontal headband shape, or in being woven into a mesh structure in length and breadth.
8. the wearable acquiring biological electric signals helmet according to claim 1, which is characterized in that the electrode（4）
For half-dried electrode or dry electrode, the electrode passes through screw thread（6）With electrode mounting hole（2.1）Connection.
9. the wearable acquiring biological electric signals helmet according to claim 8, which is characterized in that the half-dried electrode
Including electrode body（4.1）, electrode slice（4.2）, electrode tip holder（4.3）, ion permeate end（4.4）Core is connected with jointing holes（4.5）；Institute
The electrode body lower end stated is equipped with electrode cavity, the electrode slice（4.2）The top surface in electrode cavity；The ion permeates end
（4.4）End thereof contacts electrode slice（4.2）, the other end is from electrode tip holder（4.5）Lower face is exposed, as electrode and skin when using
Contact surface；The electrode tip holder（4.3）It is detachably connected with electrode cavity formation by way of clamping；The electrode slice
（4.2）It connect core with jointing holes（4.5）Electrical connection.
10. the wearable acquiring biological electric signals helmet according to claim 1, which is characterized in that the dry electrode
Including electrode body（4.1）And electrode tip（4.6）；The electrode body（4.1）It is internally provided with electrode cavity, the electrode tip
（4.6）Upper part is cased with spring（4.7）, can in electrode cavity elastic telescopic.
11. the wearable acquiring biological electric signals helmet according to claim 1, which is characterized in that on the electrode
End is equipped with hand-held part（4.6）, equipped with electrode jointing holes, external circuit is connected by cellular type plugging mode for hand-held part centre.
12. the wearable acquiring biological electric signals helmet according to claim 1, which is characterized in that described can be adjusted
Band（3）At least one end is equipped with velcro（9）, pass through velcro（9）The length of adjustment bar band.
13. the wearable acquiring biological electric signals helmet according to claim 1, which is characterized in that the rigidity is solid
Determine component（2）On be additionally provided with wireless amplifier（8）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810300873.2A CN108567425A (en) | 2018-04-04 | 2018-04-04 | A kind of wearable acquiring biological electric signals helmet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810300873.2A CN108567425A (en) | 2018-04-04 | 2018-04-04 | A kind of wearable acquiring biological electric signals helmet |
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| CN108567425A true CN108567425A (en) | 2018-09-25 |
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ID=63574159
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810300873.2A Pending CN108567425A (en) | 2018-04-04 | 2018-04-04 | A kind of wearable acquiring biological electric signals helmet |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110192857A (en) * | 2019-07-02 | 2019-09-03 | 中国人民解放军陆军军医大学第一附属医院 | Brain signal acquires device and method |
| CN110353669A (en) * | 2019-06-25 | 2019-10-22 | 杭州回车电子科技有限公司 | Bioelectrical signals for headset equipment are multiplexed acquisition device |
| CN110754729A (en) * | 2019-08-28 | 2020-02-07 | 南京医科大学第二附属医院 | PSG electrode positioning helmet |
| WO2020220162A1 (en) * | 2019-04-28 | 2020-11-05 | 武汉格林泰克科技有限公司 | Electroencephalogram electrode cap |
| CN112022150A (en) * | 2020-07-29 | 2020-12-04 | 中国人民解放军陆军军医大学第一附属医院 | Electroencephalogram acquisition system |
| CN112043265A (en) * | 2020-05-28 | 2020-12-08 | 北京机械设备研究所 | Electrode head-mounted stabilizing device |
| CN114176608A (en) * | 2021-12-28 | 2022-03-15 | 西安臻泰智能科技有限公司 | Dry electrode electroencephalogram acquisition module and electroencephalogram acquisition system |
| CN114190945A (en) * | 2021-12-01 | 2022-03-18 | 南京景瑞康分子医药科技有限公司 | Adjustable helmet for measuring brain magnetic signals |
| CN114533070A (en) * | 2022-01-28 | 2022-05-27 | 季华实验室 | Flexible wearable brain magnetic measurement helmet |
| EP4101381A1 (en) * | 2021-06-11 | 2022-12-14 | The University of Nottingham | Magnetoencephalography apparatus |
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