CN111419229A - Quasi-dry electrode for electroencephalogram acquisition and preparation method thereof - Google Patents
Quasi-dry electrode for electroencephalogram acquisition and preparation method thereof Download PDFInfo
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- CN111419229A CN111419229A CN202010186034.XA CN202010186034A CN111419229A CN 111419229 A CN111419229 A CN 111419229A CN 202010186034 A CN202010186034 A CN 202010186034A CN 111419229 A CN111419229 A CN 111419229A
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- electrode
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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]
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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
- A61B5/316—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
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/02—Details of sensors specially adapted for in-vivo measurements
- A61B2562/0209—Special features of electrodes classified in A61B5/24, A61B5/25, A61B5/283, A61B5/291, A61B5/296, A61B5/053
Abstract
The invention discloses a quasi-dry electrode for electroencephalogram acquisition and a preparation method thereof, wherein the electrode comprises: conducting material, porose film, electrolyte, electrode structure and snap fastener, wherein: the conductive material is arranged in the electrode structure and used for obtaining electroencephalogram signals as a sensor, the porous film is arranged at the bottom of the electrode structure and used for slowly releasing water in the electrode, the electrolyte is arranged in the electrode structure and comprises a water absorption material and an electrode solution which are mixed together, the water absorption material is used for absorbing water, moisturizing and reducing water in the electrode, the volatilization electrode structure is used as a shell of the electrode, and the snap fastener is used for being connected with an external electrode wire. The quasi-dry electrode for electroencephalogram acquisition and the preparation method thereof have the advantages of strong flexibility, high comfort level and strong moisturizing capability.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a quasi-dry electrode for electroencephalogram acquisition and a preparation method thereof.
Background
Electroencephalograms (EEG) contain a lot of important information about the human body, and are widely used in scientific research and medical diagnosis. At present, for the test of electroencephalogram signals, silver/silver chloride electrodes are generally used together with conductive adhesive, and the electrodes are called wet electrodes. However, as the use time increases, the conductive paste used is gradually dehydrated. This causes the contact impedance between the electrode skins to gradually increase, resulting in a gradual attenuation of the electrical brain signals being tested. Also, after using such an electrode, a user needs to wash hair, which is very inconvenient.
A search of the prior art documents shows that L ei Ren et al, in Sensors (2018)1191, write "preparation of Flexible micro electrode Array for Wearable Bio-Signal recording" ("preparation of Flexible micro Array electrode for Wearable biosignal sensor" ("sensor"), prepare a micro Array electrode.
Disclosure of Invention
The invention provides a quasi-dry electrode for electroencephalogram acquisition and a preparation method thereof aiming at the problems in the prior art, compared with the traditional wet electrode, the quasi-dry electrode does not need to clean the skin in advance and is convenient to use; compared with the common dry electrode, the electrode has strong flexibility, high comfort level and low impedance between the electrode and the skin; compared with the common quasi-dry electrode, the electrode has strong moisture retention capability and can retain moisture for a long time.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention provides a quasi-dry electrode for electroencephalogram acquisition, which comprises: the electrode structure comprises a conductive material, a porous film, electrolyte, an electrode structure and a snap fastener; wherein the content of the first and second substances,
the conductive material is arranged in the electrode structure, one end of the conductive material is connected with the snap fastener and is used as a sensor to acquire electroencephalogram signals, and the electroencephalogram signals are transmitted to an external electrode through the snap fastener;
the porous film is arranged at the bottom of the electrode structure and used for slowly releasing water in the electrode;
the electrolyte comprises a water-absorbing material and an electrode solution which are mixed together and is arranged in the electrode structure; the water absorbing material is used for absorbing water and keeping moisture so as to reduce volatilization of water in the electrode structure.
Preferably, the conductive material is conductive fiber or conductive nylon or the like, and the conductive material has good conductivity and flexibility.
Preferably, the water-absorbing material is medical-grade water-absorbing resin or medical-grade hydrogel, and the like, and the material can absorb water and keep moisture for a long time.
Preferably, the porous film is a semipermeable membrane, so that the water-absorbing material can be effectively prevented from flowing out, and water in the electrode can flow out of the semipermeable membrane; and/or the presence of a gas in the gas,
fine wires are wound outside the porous film; the outer parts of the porous film and the thin line are covered with hot melt adhesive; this prevents liquid from seeping out of the apertured film.
Preferably, the electrolyte is a mixed solution of medical grade water-absorbent resin and tap water, and the tap water in the electrode can flow out of the semipermeable membrane to moisten the skin and reduce the contact resistance between the electrode and the skin.
Preferably, the method further comprises the following steps: a flexible material; the flexible material is arranged between the bottom of the electrode structure and the porous film and used for increasing the flexibility of the electrode when the electrode is in contact with the head.
Preferably, the flexible material is gauze.
The invention also provides a preparation method of the quasi-dry electrode for electroencephalogram acquisition, which comprises the following steps:
s91: manufacturing an electrode structure;
s92: placing a conductive material within the electrode structure;
s93: sticking a porous film to the bottom of the electrode structure;
s94: injecting electrolyte obtained by mixing a water-absorbing material with an electrode solution into the electrode structure and sealing;
s95: and fixing the snap fastener on the electrode structure.
Preferably, the S92 further includes: a flexible material is placed at the bottom of the electrode structure.
Compared with the prior art, the invention has the following advantages:
(1) according to the quasi-dry electrode for electroencephalogram acquisition and the preparation method thereof, the water absorbing material is mixed in the electrolyte, so that water can be absorbed and moisturized, the volatilization of water in the electrolyte is reduced, the moisturizing capability is strong, and the moisture can be preserved for a long time;
(2) according to the quasi-dry electrode for electroencephalogram acquisition and the preparation method thereof, the porous film is arranged at the bottom of the electrode structure, so that electrolyte can slowly flow out, skin can be moistened, electrode-skin contact impedance is reduced, and the strength of acquired electroencephalogram signals can be improved;
(3) the quasi-dry electrode for electroencephalogram acquisition and the preparation method thereof provided by the invention are the quasi-dry electrode, conductive adhesive is not needed when electroencephalogram is acquired, a user does not need to wash hair after use, the skin does not need to be cleaned in advance before use, and the quasi-dry electrode is convenient to use; the invention does not need to pierce the skin of the human body when in use, and the use comfort level is high;
(4) according to the quasi-dry electrode for electroencephalogram acquisition and the preparation method thereof, the flexible material is arranged at the bottom of the electrode structure, so that the flexibility of the electrode when the electrode is in contact with the head is increased, and the use comfort is further improved.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
Embodiments of the invention are further described below with reference to the accompanying drawings:
FIG. 1 is a schematic structural diagram of a quasi-dry electrode for brain electrical acquisition according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a quasi-dry electrode for electroencephalogram acquisition according to a preferred embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a quasi-dry electrode for electroencephalogram acquisition according to a preferred embodiment of the present invention;
fig. 4a-4e are flow charts of a method for preparing a quasi-dry electrode for brain electrical acquisition according to an embodiment of the present invention.
Description of reference numerals: 1-snap fastener, 2-electrode structure, 3-electrolyte, 4-conductive material, 5-porous film and 6-flexible material.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Fig. 1 is a schematic structural diagram of a quasi-dry electrode for electroencephalogram acquisition according to an embodiment of the present invention.
Referring to fig. 1, the quasi-dry electrode for electroencephalogram acquisition of the present embodiment includes: the composite electrode comprises a snap fastener 1, an electrode structure 2, a mixed solution 3, a conductive material 4 and a porous film 5. The electrolyte 3 comprises a water-absorbing material and an electrode solution which are mixed together, and the electrolyte 3 is arranged in the electrode structure 2; the water absorbing material is used for absorbing water and keeping moisture so as to reduce volatilization of water in the electrolyte; the porous film 5 is arranged at the bottom of the electrode structure and is used for slowly releasing the electrolyte in the electrode structure 2; the snap fastener 1 is arranged on the electrode structure 2 and is used for connecting the electrode structure 2 with an external electrode; the conductive material 4 is arranged in the electrode structure 2, and one end of the conductive material is connected with the snap fastener 1, and is used for acquiring electroencephalogram signals and transmitting the electroencephalogram signals to an external electrode through the snap fastener 1.
In a preferred embodiment, the method further comprises: a flexible material 6; the flexible material 6 is disposed at the bottom of the electrode structure 2 and located inside the porous film for increasing the flexibility of the electrode when contacting with the head, and the schematic structural diagram is shown in fig. 2.
In a preferred embodiment, the flexible material is gauze.
In the preferred embodiment, the conductive material is conductive fiber, conductive nylon, etc., which has flexibility and high conductivity.
In a preferred embodiment, the water-absorbing material is medical-grade water-absorbing resin or medical-grade hydrogel, which can absorb water and retain moisture for a long time.
In a preferred embodiment, the porous membrane is a semi-permeable membrane, so that the water-absorbing material can be effectively prevented from flowing out, and water in the electrode can flow out of the semi-permeable membrane.
In a preferred embodiment, the electrolyte is a mixed solution of medical grade water-absorbent resin and tap water.
In the preferred embodiment, in order to make the quasi-dry electrode better penetrate through the hair and measure the electroencephalogram signal of the hair region, the lower part of the electrode structure is provided with a plurality of fine branches, and the fine structure makes the electrode more easily penetrate through the hair region, as shown in fig. 3. In this embodiment, the lower portion of the electrode structure is divided into four branches, but in different embodiments, the electrode structure may be divided into more than four branches.
In a preferred embodiment, the electrode structure is a 3D printed electrode structure.
In a preferred embodiment, the mass ratio of the electrolyte to the water absorbing material is any value between 1:500 and 1:1000, so that the electrode achieves a good moisture-keeping effect.
Fig. 4a-4e are flow charts of a method for preparing a quasi-dry electrode for brain electrical acquisition according to an embodiment of the present invention.
Referring to fig. 4a to 4e, the method for preparing a quasi-dry electrode for electroencephalogram acquisition of the present embodiment is a method for preparing a quasi-dry electrode in the above embodiment, and includes the following steps:
s91: an electrode structure is fabricated as shown in fig. 4 a.
S92: the conductive material as well as the flexible material is mounted within the electrode structure as shown in fig. 4 b. Specifically, firstly, a conductive material is placed in an electrode structure, and a part of the conductive material is reserved outside the electrode structure and is used for being connected with a snap button; a flexible material is then placed on the bottom of the electrode structure for increasing the flexibility of the electrode when in contact with the scalp.
S93: the apertured film is adhered to the bottom of the electrode structure as shown in figure 4 c. Specifically, the porous film is boiled in boiling water for 10 minutes and washed clean with water; then, double-sided adhesive tape is pasted at the bottom end of the electrode structure 2, and when the porous film is in a slightly wet state, the porous film is pasted on the electrode structure.
S94: an electrolyte solution of a mixture of water absorbing material and tap water was injected into the electrode structure and sealed as shown in fig. 4 d.
S95: the snap fastener is secured to the electrode structure as shown in fig. 4 e. Specifically, the conductive material and the snap fastener 1 are bonded together by using a conductive adhesive, and then the snap fastener is bonded to the electrode structure by using a hot melt adhesive.
In the preferred embodiment, S91 is specifically: the desired electrode structure is drawn using 3D mapping software and then printed using 3D printing techniques.
In a preferred embodiment, to prevent the liquid from leaking out of the porous film, S93 further includes: and (3) winding the porous film by using the thin line, and then covering the thin line and the porous film by using the hot melt adhesive.
This embodiment is a preferred embodiment of the present invention, and in different embodiments, the flexible material may not be provided.
The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, and not to limit the invention. Any modifications and variations within the scope of the description, which may occur to those skilled in the art, are intended to be within the scope of the invention.
Claims (10)
1. A quasi-dry electrode for brain electrical acquisition, comprising: the electrode structure comprises a conductive material, a porous film, electrolyte, an electrode structure and a snap fastener; wherein the content of the first and second substances,
the conductive material is arranged in the electrode structure, one end of the conductive material is connected with the snap fastener and is used as a sensor to acquire electroencephalogram signals, and the electroencephalogram signals are transmitted to an external electrode through the snap fastener;
the porous film is arranged at the bottom of the electrode structure and used for slowly releasing water in the electrode;
the electrolyte comprises a water-absorbing material and an electrode solution which are mixed together and is arranged in the electrode structure; the water absorbing material is used for absorbing water and keeping moisture so as to reduce volatilization of water in the electrode structure.
2. The quasi-dry electrode for brain electrical acquisition of claim 1, wherein the conductive material is conductive fiber or conductive nylon.
3. The quasi-dry electrode for brain electrical acquisition of claim 1, wherein the water-absorbing material is a medical-grade water-absorbing resin or a medical-grade hydrogel.
4. The quasi-dry electrode for brain electrical acquisition of claim 1, wherein the porous membrane is a semi-permeable membrane; and/or the presence of a gas in the gas,
fine wires are wound outside the porous film; the porous film and the exterior of the thin line are covered with hot melt adhesive.
5. The quasi-dry electrode for electroencephalogram acquisition according to claim 1, wherein the electrolyte is a mixed solution of medical-grade water-absorbent resin and tap water.
6. The quasi-dry electrode for brain electrical acquisition of claim 1, further comprising: a flexible material; the flexible material is arranged at the bottom of the electrode structure and positioned on the inner side of the porous film and used for increasing the flexibility of the electrode when the electrode is in contact with the head.
7. The quasi-dry electrode for brain electrical acquisition of claim 6, wherein the flexible material is gauze.
8. The quasi-dry electrode for electroencephalogram acquisition according to any one of claims 1 to 7, wherein the ratio of tap water to medical-grade water-absorbent resin in the electrolyte is 1: 500-1: 1000.
9. A method for preparing a quasi-dry electrode for brain electrical acquisition, for preparing a quasi-dry electrode for brain electrical acquisition according to any one of claims 1 to 8, comprising the steps of:
s91: manufacturing an electrode structure;
s92: placing a conductive material within the electrode structure;
s93: sticking a porous film to the bottom of the electrode structure;
s94: injecting electrolyte obtained by mixing a water-absorbing material with an electrode solution into the electrode structure and sealing;
s95: and fixing the snap fastener on the electrode structure.
10. The method for preparing a quasi-dry electrode for brain electrical acquisition of claim 9, wherein said S92 further comprises: a flexible material is placed at the bottom of the electrode structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010186034.XA CN111419229A (en) | 2020-03-17 | 2020-03-17 | Quasi-dry electrode for electroencephalogram acquisition and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010186034.XA CN111419229A (en) | 2020-03-17 | 2020-03-17 | Quasi-dry electrode for electroencephalogram acquisition and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112450938A (en) * | 2020-11-25 | 2021-03-09 | 上海交通大学 | Hydrogel electrode for long-term electroencephalogram acquisition and preparation method thereof |
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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 |
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| CN107580516A (en) * | 2015-05-08 | 2018-01-12 | 皇家飞利浦有限公司 | It is wet/to do convertible electrode and its application method |
| CN209269693U (en) * | 2018-05-30 | 2019-08-20 | 华南理工大学 | For acquiring the flexible half dry type multilayered structure electrode of EEG signals |
| US20200022605A1 (en) * | 2018-07-20 | 2020-01-23 | Korea University Research And Business Foundation | Membrane based semi-dry electrode for recording electroencephalogram |
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2020
- 2020-03-17 CN CN202010186034.XA patent/CN111419229A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104224166A (en) * | 2013-06-07 | 2014-12-24 | 上海帝仪科技有限公司 | Wet electrode based on conductive liquid |
| 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 |
| CN104068852A (en) * | 2014-06-28 | 2014-10-01 | 苏州格林泰克科技有限公司 | Bio-electricity signal sensor |
| CN107580516A (en) * | 2015-05-08 | 2018-01-12 | 皇家飞利浦有限公司 | It is wet/to do convertible electrode and its application method |
| CN106419913A (en) * | 2016-08-31 | 2017-02-22 | 苏州格林泰克科技有限公司 | Half-dry electrode, system and method for bioelectrical signal sensing |
| CN209269693U (en) * | 2018-05-30 | 2019-08-20 | 华南理工大学 | For acquiring the flexible half dry type multilayered structure electrode of EEG signals |
| US20200022605A1 (en) * | 2018-07-20 | 2020-01-23 | Korea University Research And Business Foundation | Membrane based semi-dry electrode for recording electroencephalogram |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112450938A (en) * | 2020-11-25 | 2021-03-09 | 上海交通大学 | Hydrogel electrode for long-term electroencephalogram acquisition and preparation method thereof |
| CN112450938B (en) * | 2020-11-25 | 2022-04-26 | 上海交通大学 | Hydrogel electrode for long-term electroencephalogram acquisition and preparation method thereof |
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Application publication date: 20200717 |