CN102579041A - Arrayed flexible electroencephalogram dry electrode capable of overcoming obstacle of hair and preparation method thereof - Google Patents
Arrayed flexible electroencephalogram dry electrode capable of overcoming obstacle of hair and preparation method thereof Download PDFInfo
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- CN102579041A CN102579041A CN2012100289385A CN201210028938A CN102579041A CN 102579041 A CN102579041 A CN 102579041A CN 2012100289385 A CN2012100289385 A CN 2012100289385A CN 201210028938 A CN201210028938 A CN 201210028938A CN 102579041 A CN102579041 A CN 102579041A
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Abstract
An arrayed flexible electroencephalogram dry electrode capable of overcoming obstacle of hair and a preparation method thereof belong to the technical field of medicine and are used for acquiring electroencephalogram signals. The flexible electroencephalogram dry electrode comprises a base and a contactor array extending from the base, a conductive metal film layer is arranged on the surface of the flexible electroencephalogram dry electrode, the contactors can be plugged into hair to reach the germinative layer so as to acquire the electroencephalogram signals. The dry electrode with excellent flexibility can contact with scalp well and can acquire the electroencephalogram signals well by existing processes and mechanical structures of MEMS (micro-electromechanical systems). Compared with the conventional wet electrode, the dry electrode can be used for long-term detection of the electroencephalogram signals without the preparation step of skin. Besides dry electrode which is small and flexible has high comfortableness and safety, is convenient and quick in use, low in noise to the external, and capable of completing high-quantity recording of microvolt-electroencephalogram signals.
Description
Technical field
What the present invention relates to is a kind of device of biomedical sector, specifically is a kind of dried electrode of array-type flexible brain electricity that can overcome the hair obstacle and preparation method thereof.
Background technology
Human tissue cell is always spontaneously constantly producing very faint bioelectric.Be utilized in the electrode laid on the scalp electrical activity of brain cell is extracted and after electroencephalograph amplifies, is recorded on the special paper, promptly draw certain waveform, wave amplitude, frequency and position figure, curve mutually, be electroencephalogram.When cerebral tissue generation pathology or changing function, corresponding change promptly takes place in this curve, thus for clinical diagnosis, curing the disease provides foundation.
In recent years; Continuous development and maturation along with MEMS (MEMS:Micro-Electro-Mechanical Systems) technology; Make microsystem ranges of application such as microelectronic device and microsensor constantly enlarge, be widely used in fields such as civilian, medical science, military affairs.Research in conjunction with MEMS technology brain electrode has obtained developing rapidly.
Traditional eeg signal acquisition equipment is based on wet electrode.User must coating conductive paste before using eeg signal acquisition equipment, to reduce the influence of horny layer to the EEG signals that collect.Need carry out down in that the stranger is auxiliary but smear conductive paste, need take a long time, and wet conductive paste can not effectively gather the brain electricity after dried, be unfavorable for gathering for a long time brain.In the last few years, dried electrode eeg signal acquisition equipment had appearred in the development along with the microelectrode technology.This mode not only can overcome cuticular resistive; Can also avoid smearing the inconvenience of conductive paste; And because the signal that collects is directly to extract from stratum germinativum, signal that it collects even the signal effect that collects than wet electrode eeg signal acquisition equipment are good.
Mainly there are two problems to the dried electrode of gathering EEG signals at present: the one, when gathering the brain electricity; People's self hair is laid the formation obstacle to brain electrode; Be difficult to collect the EEG signals of hair zones, obstacle how to break through hair is a key issue.The 2nd, it all is inflexible being used to gather the electric dried electrode of brain, and this is very uncomfortable concerning user, also user is existed potential danger.
Retrieval through to the prior art document is found; Chin-Teng Lin; People such as Lun-De Liao write articles " Novel Dry Polymer Foam Electrodes for Long-Term EEG Measurement " (" being applied to the dried electrode of innovation foam of polymers of long-term EEG measuring " " IEEE biomedical engineering proceedings ") at " IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING " 58 (2011) 1200-1207; This article mentions and adopts the blocky conductive foam in the side of being to make the dried electrode of measure cerebral electricity for a long time that conductive foam is soft, can be close to skin; Use comfortablely, eliminate the potential danger to human body of the electrode that hard material makes.But to the brain wave acquisition of hair zones, the structure of electrode is difficult to overcome the obstacle of hair in this article, can't gather the EEG signals of hair zones effectively.
Summary of the invention
To deficiency that exists in the above-mentioned prior art and defective, the present invention proposes a kind of dried electrode of array-type flexible brain electricity that can overcome the hair obstacle and preparation method thereof, can be flexible and be the eeg signal acquisition that is used to have hair zones.This electrode can obtain the EEG signals of reliable and stable fast, solves all the time and when gathering the brain electricity, receives the interferential problem of hair, the comfortableness and the safety that also improve brain electrode simultaneously.
The present invention realizes through following technical scheme:
A kind of dried electrode of array-type flexible brain electricity that can overcome the hair obstacle; Be used for the collection of EEG signals; The dried electrode of said flexible brain electricity comprises the feeler that is array that stretches out on base and the base; Its surface has one deck conductive metal film, and said feeler can insert hair, and the stratum germinativum that reaches skin carries out the collection of EEG signals.
The dried electrodes use of described flexible brain electricity has the biocompatible polymeric material polydimethylsiloxane and processes.
The conductive metal film of the dried electrode surface of described flexible brain electricity is to obtain through MEMS (MEMS) PROCESS FOR TREATMENT.
A kind of method for preparing the dried electrode of above-mentioned flexible brain electricity comprises that step is following:
1) utilize the method for machining to make the flexible dry electrode die;
2) polymeric material is cast in the flexible dry electrode die after through pretreatment, through forming pretreatment flexible dry electrode behind the baking oven heat treatment;
3), can obtain having the dried electrode of flexible brain electricity of electric conductivity at pretreatment flexible dry electrode surface sputter one deck conductive metal film.
Said flexible dry electrode die comprises upper bolster, middle die holder and die shoe.
In the above-mentioned method for preparing, said flexible dry electrode die upper bolster is a ring-type, and circle utilizes boring cutter processing in the annular.Interior diameter of a circle has determined the size of flexible dry electrodes base, the thickness of the height decision flexible dry electrodes base of mold.
In the above-mentioned method for preparing, die holder is the through hole of array shape in the said flexible dry electrode die.Through hole utilizes drilling machine processing.The size of the feeler of the diameter decision flexible dry electrode in hole, the height of middle die holder has determined the length of flexible dry electrode feeler.During mould, the quantity of die holder is to change the length of feeler in can increasing arbitrarily as required in design.
In the above-mentioned method for preparing, said flexible dry electrode die shoe has the circular hole with middle die holder identical array shape and quantity, and the circular hole of die shoe is a blind hole.The design of die shoe is in order to be beneficial to the demoulding.
In the above-mentioned method for preparing, the pretreatment of described polymeric material polydimethylsiloxane is to take out the bubble that degass after prepolymerized polydimethylsiloxane and firming agent mass ratio are mixed at 10: 1.
In the above-mentioned method for preparing, described baking oven heat treatment is meant in baking oven 70 ℃ of heat treatments 2 hours.
Described flexible dry electrode die can adopt nylon, rustless steel, aluminium.
Said flexible dry electrode is to do on the basis of pretreatment flexible dry electrode to utilize MEMS technology to make pretreatment flexible dry electrode possess electric conductivity.Pretreatment flexible dry electrode is wrapped up the fine and close metallic film (like platinum, gold etc.) of one deck through the method for physical vapour deposition (PVD) at polymer surfaces.
The present invention adopts the method for polymer casting, and the flexible dry electrode in conjunction with the MEMS processing technology is made not only has the array feeler structure of innovation, and has flexible characteristics.Show according to research; Position after the main region of EEG signals is overhead inclined to one side; But this position is because the collection obstacle that causes of hair, and all the time, adopting dried electrode technology to gather EEG signals all is electrode to be positioned over forehead sentence the interference of avoiding hair near the line of gaining fame and fortune.The present invention can insert the obstacle that overcomes hair in the hair with feeler, and electrode is positioned over the abundant position of EEG signals, and the EEG signals of collection are more accurate, the comfortableness and the safety that also improve brain electrode simultaneously.
Description of drawings
Fig. 1 (1)～Fig. 1 (3) is a flexible dry electrode die sketch map of the present invention;
Fig. 2 is a pretreatment flexible dry electrode moulding process sketch map of the present invention;
Fig. 3 is a pretreatment flexible dry electrode pictorial diagram of the present invention;
Fig. 4 is the dried electrode pictorial diagram of the flexible brain electricity of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
Shown in Fig. 1 (1)～Fig. 1 (3), present embodiment flexible dry electrode die comprises: upper bolster 1, middle die holder 2, die shoe 3. wherein mold materials are aluminum.Upper bolster 1 is a loop configuration, and interior radius of circle is 8mm, and exradius is 12mm.Upper bolster 1 highly is 5mm.Middle die holder 2 is the through hole of array shape.Die shoe 3 has the circular hole with middle die holder 2 identical array shapes and quantity, and the circular hole of die shoe 3 is a blind hole.Upper bolster 1, middle die holder 2 and die shoe 3 are used dowel fixes.
As shown in Figure 2, this figure is pretreatment flexible dry electrode 4 moulding process figure.At first with the polymer poly dimethyl siloxane according to certain proportioning stir, evacuation; The polydimethylsiloxane that to take out vacuum then is poured in the flexible dry electrode die; The flexible dry electrode die is put into baking oven; Taking out after the curing in two hours under 70 ℃ of conditions, at last pretreatment flexible dry electrode is taken out in the flexible dry electrode die.
As shown in Figure 3, resulting pretreatment flexible dry electrode is put into the vacuum sputtering machine, just can form the fine and close metallic film of one deck on pretreatment flexible dry electrode 4 surfaces, obtain having the dried electrode 5 of flexible brain electricity of electric conductivity, as shown in Figure 4.
Microneedle electrodes passes through MEMS technology in the present embodiment: pretreatment flexible dry electrode is placed in the sputtering chamber, be evacuated to about 2X10 in the sputtering chamber
-6T, the setting radio-frequency power is 150W, after 20～30 minutes, just can form metallic film at polymer surfaces.
The operation principle of present embodiment is: EEG signals are by several hundred million neuronic movable generations in the cerebral tissue, and electroencephalogram is that the electrical activity that will be present in cerebral tissue through brain electrode on the scalp extracts, and EEG signals have reflected brain functional status at any time.The collection of normal conditions EEG signals is to adopt traditional wet electrode method, and wet electrode need pass through the auxiliary and skin treatments of conductive paste when gathering, and this causes great inconvenience and discomfort to user.The dried electrode of flexible brain electricity need not the auxiliary of conductive paste and just can obtain EEG signals to skin treatments; Wet electrode than preoperative preparation of skin; This electrode need not conductive paste and waits to assist eeg signal acquisition, reduces the complexity of gathering greatly, is beneficial to the long term monitoring collection of EEG signals.
In the present embodiment: when this device is applied to eeg signal acquisition, the flexible dry electrode is fixed on the head, utilizes the feeler on the electrode can pass hair contact hair through head hoop or electrode cap.Because the present invention has flexibility function, can well follow the curved surface of human brain, increase the contact area of electrode and skin, reduce the contact impedance between electrode scalp and the electrode.Through design and material chosen to dried electrode structure, not only can be for a long time to the collection of EEG signals, and avoid the interference and the outside noise of hair.
As shown in table 1, the used size of the application request of present embodiment:
Table 1
The dried electrode structure of flexible brain electricity that the present invention is used for eeg signal acquisition combines existing MEMS technology to add to design structure cleverly; Can be good at gathering EEG signals; Compare with traditional wet electrode, do not need the skin preparation process, can be used for the detection of long-term EEG signals.Its structure is small and exquisite, and is easy to use quick, can accomplish the high-quality record of microvolt level EEG signals.
Claims (10)
1. dried electrode of array-type flexible brain electricity that can overcome the hair obstacle; Be used for the collection of EEG signals; It is characterized in that the dried electrode of said flexible brain electricity comprises the feeler that is array that stretches out on base and the base, its surface has one deck conductive metal film; Said feeler can insert hair, and the stratum germinativum that reaches skin carries out the collection of EEG signals.
2. the dried electrode of array-type flexible brain electricity that can overcome the hair obstacle according to claim 1 is characterized in that, the dried electrodes use of described flexible brain electricity has the biocompatible polymeric material polydimethylsiloxane and processes.
3. the dried electrode of array-type flexible brain electricity that can overcome the hair obstacle according to claim 1 is characterized in that, the conductive metal film of the dried electrode surface of described flexible brain electricity is to obtain through MEMS (MEMS) PROCESS FOR TREATMENT.
4. a method for preparing the dried electrode of the described flexible brain electricity of claim 1 to 3 is characterized in that, comprises that step is following:
1) utilize the method for machining to make the flexible dry electrode die;
2) polymeric material is cast in the flexible dry electrode die after through pretreatment, through forming pretreatment flexible dry electrode behind the baking oven heat treatment;
3), can obtain having the dried electrode of flexible brain electricity of electric conductivity at pretreatment flexible dry electrode surface sputter one deck conductive metal film.
5. the method for preparing of the dried electrode of flexible brain electricity according to claim 4 is characterized in that said flexible dry electrode die comprises upper bolster, middle die holder and die shoe.
6. the method for preparing of the dried electrode of flexible brain electricity according to claim 5; It is characterized in that said upper bolster is justified in the annular and utilized boring cutter processing in the form of a ring; Interior circular diameter determines the size of the dried electrodes base of flexible brain electricity, highly determines the thickness of flexible dry electrodes base.
7. the method for preparing of the dried electrode of flexible brain electricity according to claim 5; It is characterized in that said middle die holder is the through hole of array shape, through hole utilizes drilling machine processing; The diameter in hole determines the size of the feeler of flexible dry electrode, highly determines the length of flexible dry electrode feeler.
8. the method for preparing of the dried electrode of flexible brain electricity according to claim 5 is characterized in that said die shoe has the circular hole with middle die holder identical array shape and quantity, and the circular hole of die shoe is a blind hole.
9. the method for preparing of the dried electrode of flexible brain electricity according to claim 4 is characterized in that, said polymeric material pretreatment is to take out the bubble that degass after prepolymerized polydimethylsiloxane and firming agent mass ratio are mixed at 10: 1.
10. the method for preparing of the dried electrode of flexible brain electricity according to claim 4 is characterized in that, described baking oven heat treatment is meant in baking oven 70 ℃ of heat treatments 2 hours.
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Cited By (11)
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| CN103767704A (en) * | 2014-01-20 | 2014-05-07 | 上海交通大学 | Quasi-dry electrode used for electroencephalogram measurement and preparation method thereof |
| CN103767703A (en) * | 2014-03-04 | 2014-05-07 | 上海海事大学 | Portable wireless electroencephalogram data real-time acquisition system and running method thereof |
| CN103876737A (en) * | 2014-04-08 | 2014-06-25 | 青岛柏恩鸿泰电子科技有限公司 | Dry soft electrode based on direct-current magnetron sputtering technology and manufacturing process thereof |
| CN103932704A (en) * | 2013-01-23 | 2014-07-23 | 上海帝仪科技有限公司 | Skin contact device for wet electrode, wet electrode liquid storage box and brain wave collecting electrode with wet electrode liquid storage box |
| CN104510466A (en) * | 2014-12-15 | 2015-04-15 | 上海交通大学 | Flexible composite dry electrode and manufacturing method thereof |
| CN104799853A (en) * | 2015-04-09 | 2015-07-29 | 中国科学院半导体研究所 | Tough claw type dry electrode used for recording electroencephalogram and preparation method |
| CN108309291A (en) * | 2018-03-12 | 2018-07-24 | 复旦大学 | A kind of flexible contact electrode for encephalograms and preparation method thereof |
| CN109124626A (en) * | 2018-07-26 | 2019-01-04 | 天津大学 | Novel passive flexible optical electrode |
| CN109875555A (en) * | 2019-03-05 | 2019-06-14 | 浙江中医药大学 | A kind of Noninvasive electroencephalogramrecording recording electrode and preparation method thereof |
| WO2021093788A1 (en) * | 2019-11-14 | 2021-05-20 | 深圳先进技术研究院 | Headband-type biological signal acquisition device and preparation method therefor |
| CN112967832A (en) * | 2021-02-01 | 2021-06-15 | 天津理工大学 | Flexible comb-shaped semi-dry electrode and preparation method thereof |
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| CN103932704A (en) * | 2013-01-23 | 2014-07-23 | 上海帝仪科技有限公司 | Skin contact device for wet electrode, wet electrode liquid storage box and brain wave collecting electrode with wet electrode liquid storage box |
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| CN103767704B (en) * | 2014-01-20 | 2015-08-26 | 上海交通大学 | Dry electrode of a kind of standard for EEG measuring and preparation method thereof |
| CN103767703A (en) * | 2014-03-04 | 2014-05-07 | 上海海事大学 | Portable wireless electroencephalogram data real-time acquisition system and running method thereof |
| CN103876737A (en) * | 2014-04-08 | 2014-06-25 | 青岛柏恩鸿泰电子科技有限公司 | Dry soft electrode based on direct-current magnetron sputtering technology and manufacturing process thereof |
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| CN104510466A (en) * | 2014-12-15 | 2015-04-15 | 上海交通大学 | Flexible composite dry electrode and manufacturing method thereof |
| CN104799853A (en) * | 2015-04-09 | 2015-07-29 | 中国科学院半导体研究所 | Tough claw type dry electrode used for recording electroencephalogram and preparation method |
| CN108309291A (en) * | 2018-03-12 | 2018-07-24 | 复旦大学 | A kind of flexible contact electrode for encephalograms and preparation method thereof |
| CN108309291B (en) * | 2018-03-12 | 2023-11-24 | 复旦大学 | Flexible contact brain electrode and preparation method thereof |
| CN109124626A (en) * | 2018-07-26 | 2019-01-04 | 天津大学 | Novel passive flexible optical electrode |
| CN109124626B (en) * | 2018-07-26 | 2021-11-23 | 天津大学 | Novel passive flexible optical electrode |
| CN109875555A (en) * | 2019-03-05 | 2019-06-14 | 浙江中医药大学 | A kind of Noninvasive electroencephalogramrecording recording electrode and preparation method thereof |
| WO2021093788A1 (en) * | 2019-11-14 | 2021-05-20 | 深圳先进技术研究院 | Headband-type biological signal acquisition device and preparation method therefor |
| CN112967832A (en) * | 2021-02-01 | 2021-06-15 | 天津理工大学 | Flexible comb-shaped semi-dry electrode and preparation method thereof |
| CN112967832B (en) * | 2021-02-01 | 2023-02-28 | 天津理工大学 | Flexible comb-shaped semi-dry electrode and preparation method thereof |
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