CN114469107A - Hydrogel electroencephalogram sensor and preparation and use methods thereof - Google Patents
Hydrogel electroencephalogram sensor and preparation and use methods thereof Download PDFInfo
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- CN114469107A CN114469107A CN202111620918.2A CN202111620918A CN114469107A CN 114469107 A CN114469107 A CN 114469107A CN 202111620918 A CN202111620918 A CN 202111620918A CN 114469107 A CN114469107 A CN 114469107A
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- 239000000017 hydrogel Substances 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000002243 precursor Substances 0.000 claims abstract description 10
- 239000000499 gel Substances 0.000 claims abstract description 9
- 230000001678 irradiating effect Effects 0.000 claims abstract description 7
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 7
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 9
- 239000003792 electrolyte Substances 0.000 claims description 7
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 6
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000003906 humectant Substances 0.000 claims description 5
- 238000002788 crimping Methods 0.000 claims description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- CYDQOEWLBCCFJZ-UHFFFAOYSA-N 4-(4-fluorophenyl)oxane-4-carboxylic acid Chemical compound C=1C=C(F)C=CC=1C1(C(=O)O)CCOCC1 CYDQOEWLBCCFJZ-UHFFFAOYSA-N 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 229910021607 Silver chloride Inorganic materials 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
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- 229910052737 gold Inorganic materials 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000003595 mist Substances 0.000 claims description 3
- 239000001103 potassium chloride Substances 0.000 claims description 3
- 235000011164 potassium chloride Nutrition 0.000 claims description 3
- 229960004063 propylene glycol Drugs 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 239000001540 sodium lactate Substances 0.000 claims description 3
- 229940005581 sodium lactate Drugs 0.000 claims description 3
- 235000011088 sodium lactate Nutrition 0.000 claims description 3
- 229940045920 sodium pyrrolidone carboxylate Drugs 0.000 claims description 3
- HYRLWUFWDYFEES-UHFFFAOYSA-M sodium;2-oxopyrrolidine-1-carboxylate Chemical compound [Na+].[O-]C(=O)N1CCCC1=O HYRLWUFWDYFEES-UHFFFAOYSA-M 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000001723 curing Methods 0.000 description 3
- 210000004556 brain Anatomy 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001149 cognitive effect Effects 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
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- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000000016 photochemical curing Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 210000004761 scalp Anatomy 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 238000012719 thermal polymerization Methods 0.000 description 1
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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
- A61B5/251—Means for maintaining electrode contact with the body
- A61B5/257—Means for maintaining electrode contact with the body using adhesive means, e.g. adhesive pads or tapes
- A61B5/259—Means for maintaining electrode contact with the body using adhesive means, e.g. adhesive pads or tapes using conductive adhesive means, e.g. gels
-
- 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
- A61B5/263—Bioelectric electrodes therefor characterised by the electrode materials
- A61B5/265—Bioelectric electrodes therefor characterised by the electrode materials containing silver or silver chloride
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Veterinary Medicine (AREA)
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- Pathology (AREA)
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Abstract
The invention discloses a hydrogel electroencephalogram sensor which comprises a base, a hydrogel and electrodes, wherein the hydrogel is arranged on the base; the base is used for supporting and fixing the electroencephalogram sensor; the hydrogel is used for contacting with the skin and transmitting an electroencephalogram signal to the electrodes; one end of the electrode is contacted with the hydrogel, and the other end of the electrode is connected with an external circuit; the top surface of the base is provided with a hollow structure and is used for injecting gel precursor solution and irradiating ultraviolet light to initiate polymerization. In addition, the invention also relates to a preparation method and a use method of the sensor. The hydrogel electroencephalogram sensor provided by the invention is simple in structure and preparation process, can be repeatedly used, and is reliable in signal quality.
Description
Technical Field
The invention relates to a hydrogel electroencephalogram sensor and a preparation method and a use method thereof, and is suitable for clinical and daily life scene electroencephalogram application.
Background
Electroencephalogram is a common bioelectric signal and is widely applied in the fields of disease diagnosis, cognitive psychology and brain-computer interfaces. The electroencephalogram electrode is key hardware for acquiring electroencephalogram signals, and directly influences the quality of the electroencephalogram signals. The traditional brain electrode is a wet electrode, namely, the traditional brain electrode needs to be matched with conductive adhesive (paste) for use. The conductive adhesive can effectively reduce the electrode-skin impedance, has reliable signal quality and is the gold standard of the current electroencephalogram recording electrode. However, it takes a lot of time to inject the conductive paste into the wet electrode, and the conductive paste may soil the hair of the subject or patient, and it is necessary to wash the hair after recording. Therefore, the wet electrode is not suitable for electroencephalogram application in daily life scenes.
The existing gel electrode has strong viscosity, is not easy to peel off from skin, has poor mechanical strength, and is mostly used as a disposable electrode. CN112450938 and CN209644892 report hydrogel electrodes that can be reused many times, but no polymerization method is reported. The traditional hydrogel electrode is formed by adopting a thermosetting mode, and is slow in thermosetting forming, high in energy consumption and low in production efficiency. The disposable electrocardio-electrode is produced by adopting an ultraviolet curing mode, because the gel thickness is thin, the gel surface is completely exposed to ultraviolet light, and the gel can be well polymerized and molded.
Because of the need of mould forming, the exposed ultraviolet curing area is limited, and the curing cannot be completed, so that the use of the photocuring technology in the electroencephalogram electrode is limited. Therefore, the structural design of the electrode needs to be optimized, and the gel electroencephalogram electrode which can be repeatedly used and can be rapidly produced needs to be developed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and the electrode active material is added with a conductive agent, so that the service life of the electroencephalogram electrode is prolonged while the excellent non-polarization performance is maintained, and the electrode is suitable for high-precision and high-current-density direct-current electrical stimulation and electroencephalogram signal recording.
The technical scheme of the invention is as follows:
a hydrogel electroencephalogram sensor comprises a base, hydrogel and electrodes. The base is used for supporting and fixing the electroencephalogram sensor; the hydrogel is used for contacting with the skin and transmitting an electroencephalogram signal to the electrodes; one end of the electrode is contacted with the hydrogel, and the other end of the electrode is connected with an external circuit; the top surface of the base is provided with a hollow structure and is used for injecting gel precursor solution and irradiating ultraviolet light to initiate polymerization.
The further technical scheme is as follows:
the base of the hydrogel electroencephalogram sensor is provided with the locking reinforcing ribs, so that hydrogel can be stably fixed in the base, and therefore stable contact with the electrodes is formed.
The hydrogel electroencephalogram sensor is characterized in that the contact end of the hydrogel and the skin is in a micro-protrusion shape.
The electrodes of the hydrogel electroencephalogram sensor are conductive coatings on the inner wall and/or the inner top surface of the base.
The electrodes of the hydrogel electroencephalogram sensor are electrode plates connected with leads.
The electrodes of the hydrogel electroencephalogram sensor are connected with the cable in a welding or crimping mode; or snap-fit to a cable or circuit board of the device via metal snap fasteners.
The hydrogel electroencephalogram sensor is characterized in that the electrode material is one of Ag/AgCl, silver, gold and composite materials thereof.
The hydrogel electroencephalogram sensor comprises a hydrogel containing a humectant, wherein the humectant is at least one selected from glycerol, 1, 2-propylene glycol, sodium lactate and sodium pyrrolidone carboxylate.
The hydrogel electroencephalogram sensor is characterized in that the hydrogel contains electrolyte, and the electrolyte is selected from sodium chloride or/and potassium chloride.
The invention relates to a preparation method of a hydrogel electroencephalogram sensor, which comprises the following steps:
(1) fixing the electrode on the base;
(2) fixing the base on a formed bottom die;
(3) injecting a hydrogel precursor solution into a cavity formed by the sealing sleeve and the base through the hollow structure on the top surface of the base, and irradiating the top end of the base by ultraviolet light until hydrogel is formed;
(4) and taking the sensor out of the bottom die.
The invention also relates to a using method of the hydrogel electroencephalogram sensor, when in use, the hydrogel is contacted with the skin to be detected, and the electrodes are connected with a circuit of external equipment; after use, the bottom die can be sleeved on the hydrogel, or the hydrogel can be taken out and stored in a sealed box, so that the evaporation of water in the hydrogel is reduced; when the hydrogel is dried, water mist is sprayed on the surface of the hydrogel to swell the hydrogel, and the hydrogel can be reused.
The hydrogel electroencephalogram sensor and the preparation and use methods thereof provided by the invention have the following remarkable beneficial effects:
according to the hydrogel electroencephalogram sensor provided by the invention, the hollow structure is designed on the top surface of the base, so that ultraviolet light can uniformly radiate a hydrogel precursor solution, and meanwhile, the hydrogel precursor solution can be rapidly polymerized in situ in the base by matching with the bottom die, so that the stable contact between an electrode and the hydrogel is maintained. The preparation process is simple and quick, and can be repeatedly used. The hydrogel electroencephalogram sensor adopts hydrogel to replace conductive adhesive, is more convenient and comfortable to use, has reliable signals, and does not need to wash hair after electroencephalogram recording. The hydrogel contains humectant and electrolyte components, can retain moisture for a long time, has good conductivity, and can maintain stable electrode/electrolyte interface. The base is provided with locking ribs to ensure that the hydrogel is stably held in the base so as to make stable contact with the electrodes.
Drawings
FIG. 1 is a schematic structural diagram of a hydrogel electroencephalogram sensor provided by the invention.
FIG. 2 is a schematic structural diagram of another hydrogel electroencephalogram sensor provided by the invention.
1-a base; 2-an electrode; 3-a hydrogel; 4, a hollow structure; 5, locking a reinforcing rib; 6, bottom die; 7-a cable; 8-sealing material; 9-button type connecting structure.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1: is a basic embodiment of the present invention. As shown in figures 1 and 2, the hydrogel electroencephalogram sensor comprises a base 1, hydrogel 2 and electrodes 3. The base 1 is used for supporting and fixing the electroencephalogram sensor, and for example, the electroencephalogram sensor can be fixed on a supporting body such as a cap body, a strip and a helmet. The hydrogel 2 is used for contacting with the skin and transmitting an electroencephalogram signal to the electrodes. One end of the electrode 2 is contacted with the hydrogel, and the other end of the electrode is connected with an external circuit; the top surface of the base 1 is provided with a hollow structure 4 for injecting gel precursor solution and irradiating ultraviolet light to initiate polymerization. The shape of the hollow hole structure is not limited, and the hollow hole structure can be designed according to requirements, such as an oval shape, a square shape and the like.
Example 2: is a preferred embodiment of the present invention. On the basis of example 1, the base 1 is provided with locking ribs 5 to ensure that the hydrogel is stably held in the base and thus is in stable contact with the electrodes. The contact end of the hydrogel 2 and the skin is in a micro-convex shape, so that the contact between the hydrogel and the scalp can be facilitated by penetrating through the hair, the contact pressure is enhanced, a stable electrode-skin interface is maintained, and the recording of electroencephalogram signals of the haired area is realized. The electrode 2 is a conductive coating on the inner wall and/or the inner top surface of the base. When the electrode 2 is an electrode plate connected with a lead, the same embodiment is adopted. The electrode 2 is connected with the cable 7 in a welding or crimping mode, and the welding points or crimping points of the electrode 2 and the cable 7 are sealed and insulated by sealing materials such as epoxy and the like; when the electrode 2 is provided with the snap-type connecting structure 9, the snap-type connecting structure is snapped on a circuit board of a cable or equipment through a metal snap-fastener, and the electrode belongs to the equivalent embodiment. The material of the electrode is selected from one of Ag/AgCl, silver, gold and composite materials thereof. The hydrogel contains humectant which is at least one of glycerol, 1, 2-propylene glycol, sodium lactate and sodium pyrrolidone carboxylate, so that the hydrogel is not easy to dry, and the working time of the hydrogel electroencephalogram sensor is facilitated. The hydrogel contains electrolyte selected from sodium chloride or/and potassium chloride, and is used for maintaining a stable electrode/electrolyte interface and improving the quality of electroencephalogram signals.
Example 3: the preparation method of the hydrogel electroencephalogram electrode comprises the following steps:
(1) fixing the electrode 2 on the base 1;
(2) fixing the base 2 on a formed bottom die 6 (shown in figure 1);
(3) injecting a hydrogel precursor solution into a cavity formed by the sealing sleeve and the base through the hollow structure 4 on the top surface of the base 1, and irradiating the top end of the base with ultraviolet light until hydrogel is formed;
(4) the sensor is inserted into the bottom mold 6 (see fig. 1).
The preparation method has the advantages that: the preparation process is simple, the hydrogel precursor solution can be uniformly radiated by ultraviolet light, the hydrogel with uniform performance can be rapidly prepared in situ in the base, and the stable contact between the hydrogel and the electrode is ensured. The polymerization speed is faster compared to the thermal polymerization method. Compared with the ex-situ polymerization method (i.e., preparing the hydrogel and then assembling the hydrogel into the pedestal), the method has the advantages of simpler process and more stable contact between the hydrogel and the electrode.
Example 4: the application method of the hydrogel electroencephalogram sensor comprises the following steps: when in use, the hydrogel is contacted with the skin to be detected, and the electrodes are connected with a circuit of external equipment; after use, the bottom die can be sleeved on the hydrogel, or the hydrogel can be taken out and stored in a sealed box, so that the evaporation of water in the hydrogel is reduced; when the hydrogel is dried, water mist is sprayed on the surface of the hydrogel to swell the hydrogel, and the hydrogel can be reused. The hydrogel electroencephalogram sensor is convenient to use and can be repeatedly used for multiple times.
The above embodiments of the present invention are merely exemplary to further illustrate the technical solutions, principles, applications, and efficacies, and those skilled in the art may make various changes and modifications without departing from the inventive concept, which falls into the protection scope of the present invention. That is, the scope of the claims of the present invention is not limited to the above-described embodiments.
Claims (11)
1. A hydrogel electroencephalogram sensor is characterized in that: comprises a base, hydrogel and electrodes; the base is used for supporting and fixing the electroencephalogram sensor; the hydrogel is used for contacting with the skin and transmitting an electroencephalogram signal to the electrodes; one end of the electrode is contacted with the hydrogel, and the other end of the electrode is connected with an external circuit; the top surface of the base is provided with a hollow structure and is used for injecting gel precursor solution and irradiating ultraviolet light to initiate polymerization.
2. The hydrogel electroencephalogram sensor according to claim 1, which is characterized in that: the base is provided with locking ribs to ensure that the hydrogel can be stably fixed in the base so as to form stable contact with the electrodes.
3. The hydrogel electroencephalogram sensor according to claim 1, which is characterized in that: the hydrogel is in a micro-convex shape with the skin contact end.
4. The hydrogel electroencephalogram sensor according to claim 1, which is characterized in that: the electrode is a conductive coating on the inner wall and/or the inner top surface of the base.
5. The hydrogel electroencephalogram sensor according to claim 1, which is characterized in that: the electrode is an electrode plate connected with a lead.
6. The hydrogel electroencephalogram sensor according to claim 1, which is characterized in that: the electrode is connected with the cable in a welding or crimping mode; or snap-fit to a cable or circuit board of the device via metal snap fasteners.
7. The hydrogel electroencephalogram sensor according to claim 1, which is characterized in that: the material of the electrode is selected from one of Ag/AgCl, silver, gold and composite materials thereof.
8. The hydrogel electroencephalogram sensor according to claim 1, which is characterized in that: the hydrogel contains humectant selected from at least one of glycerol, 1, 2-propylene glycol, sodium lactate, and sodium pyrrolidone carboxylate.
9. The hydrogel electroencephalogram sensor according to claim 1, characterized in that: the hydrogel contains electrolyte selected from sodium chloride and/or potassium chloride.
10. The preparation method of the hydrogel electroencephalogram sensor according to any one of claims 1 to 9, which is characterized by comprising the following steps: the method comprises the following steps:
(1) fixing the electrode on the base;
(2) fixing the base on a formed bottom die;
(3) injecting a hydrogel precursor solution into a cavity formed by the sealing sleeve and the base through the hollow structure on the top surface of the base, and irradiating the top end of the base by ultraviolet light until hydrogel is formed;
(4) and taking the sensor out of the bottom die.
11. The use method of the hydrogel electroencephalogram sensor according to any one of claims 1 to 9, characterized in that: when in use, the hydrogel is contacted with the skin to be detected, and the electrodes are connected with a circuit of external equipment; after use, the bottom die can be sleeved on the hydrogel, or the hydrogel can be taken out and stored in a sealed box, so that the evaporation of water in the hydrogel is reduced; when the hydrogel is dried, water mist is sprayed on the surface of the hydrogel to swell the hydrogel, and the hydrogel can be reused.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111620918.2A CN114469107A (en) | 2021-12-28 | 2021-12-28 | Hydrogel electroencephalogram sensor and preparation and use methods thereof |
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| CN202111620918.2A CN114469107A (en) | 2021-12-28 | 2021-12-28 | Hydrogel electroencephalogram sensor and preparation and use methods thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117814800A (en) * | 2024-03-05 | 2024-04-05 | 大连理工大学 | Semi-dry hydrogel electrode with antibacterial effect and preparation method thereof |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117814800A (en) * | 2024-03-05 | 2024-04-05 | 大连理工大学 | Semi-dry hydrogel electrode with antibacterial effect and preparation method thereof |
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