CN105615880A - Flexible graphene electroencephalogram capacitive electrode capable of inhibiting motion artifacts - Google Patents
Flexible graphene electroencephalogram capacitive electrode capable of inhibiting motion artifacts Download PDFInfo
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Abstract
The invention provides a flexible graphene electroencephalogram capacitive electrode capable of inhibiting motion artifacts. The electrode comprises a substrate player, a fabric conductive layer, a first motion artifact inhibition layer, a filler layer, a second motion artifact inhibition layer, a touch surface layer and an insulated shielding layer, wherein flexible fabric forms the substrate layer; conductive cloth forms the fabric conductive layer; conductive sponge and conductive fabric form the first motion artifact inhibition layer; an insulated rubber plate forms the filler layer; the conductive cloth and the conductive sponge form the second motion artifact inhibition layer; a graphene coating forms the touch surface layer; insulated fabric forms the insulated shielding layer. The electrode is an electroencephalogram dry electrode according with a capacity coupling principle, a flexible electrode material is adopted, accordingly, no irritation and harm are caused to skin, and the electrode can be worn for a long time.
Description
Technical field
The invention belongs to medical apparatus and instruments (apparatus)/electrode for encephalograms field, be specifically related to a kind of suppression motion artifacts Graphene flexibility brain capacitive electrode.
Background technology
Brain electricity (EEC) is the direct exterior representations of central nervous system, can detect the active state of cerebral cortex zones of different, reflects the brain district interactive mode of Human Physiology, mental status and different brain function. Meanwhile, brain electricity can provide diagnostic message as the brain diseasess such as epilepsy, dementia, tumor or brain death.
Brain electricity gathers signal by electrode for encephalograms. According to whether employing Signa Gel, electrode for encephalograms is broadly divided into wet electrode and dry electrode. Conventional wet electrode detection brain electricity in traditional medical, measured, before carrying out brain wave acquisition, need to smear conducting medium. Wet electrode is disadvantageous in that its preparation is complicated, and conductive silver glue is air-dry gradually in time and causes measurement error, it is easy to causes skin allergy, affects comfort level, is not suitable for long-time monitoring. Dry electrode does not use conductive paste (or gel) or other electrolytes as the coupling path between skin and electrode, but directly contact between skin and electrode or Capacitance Coupled form the electrode of path. Capacitive electrode is also the one of dry electrode. One distinguishing feature of capacitive electrode is can to measure signal across hair or medicated clothing cloth etc., and now hair (hair) or medicated clothing cloth etc. serve as capacitor dielectric. Still lacking at present can the sensor dynamically obtaining EEG signals of long-term comfortable wearing.
Graphene is the lightest the thinnest a kind of material being currently known, the thickness of the Graphene only one of which carbon atom of monolayer. Graphene is also electric conductivity best material in the world, and electronics movement velocity wherein has reached the 1/300 of the light velocity, considerably beyond electronics movement velocity in general conductor. Only it is made up of carbon and perfect structure due to Graphene, is the ideal material manufacturing ultrasensitive biological sensor.
Existing dry electrode brain wave acquisition technology has micropin technology, ultra-high input impedance amplifier and photoelectric sensing etc.
Referring to Fig. 3, micropin technology is dry electrode brain wave acquisition technology the most commonly used at present, and it adopts needle electrode to be directed through horny layer, embeds low-impedance stratum germinativum to complete the technology of signals collecting. But skin thickness varies with each individual, for the people that skin is relatively thin, micropin front end is likely to puncture stratum germinativum and enters full blood vessel and neural skin corium, thus producing pain. Owing to electrode is direct and scalp interior contact, it is easy to cause cross infection, be generally disposable electrode.
The electrode for encephalograms of ultra-high-impedance amplifier technique mainly guarantees sensor and scalp close contact, mostly adopts metal material. But, metal material electrode corrosion resistance is low, anti-interference and noise resisting ability inequality, easily produces polarization when micro-electric current passes through. Metal dry electrode wearing comfort is poor simultaneously, and motion artifacts is obvious.
The dry electrode of photoelectric sensing utilizes special organic material according to the deformation degree of the electric field produced under different voltages, the change of perception brain electricity. This type of electrode assembly is complicated, generally requires health care professional's auxiliary when detecting brain electricity and carries out, is not appropriate for tester and wears use in daily life for a long time.
Existing dry electrode can the short time monitors the EEG signals under human body resting state well, can not meet when the motion artifacts having limbs to move or people causes when motion, can not realize dressing for a long time in daily life detection. Present brain electrical dry electrode material mostly is the rigid materials such as metal, and electrode can not be fitted scalp very well, had both affected wearing comfort, again easily caused by motion artifacts.
Summary of the invention
It is an object of the invention to provide a kind of suppression motion artifacts Graphene flexibility brain capacitive electrode, be a kind of Capacitance Coupled principle brain electrical dry electrode. One distinguishing feature of capacitive electrode is can to measure signal across hair or medicated clothing cloth etc., and now hair (hair) or medicated clothing cloth etc. serve as capacitor dielectric. The material of electrode for encephalograms adopts conductive fabric, conductive sponge, insulating rubber slab and Graphene, is flexible material, skin is non-stimulated and damage, increases wearing comfort, can long periods of wear use. In the dynamic case, flexible material can be fitted scalp structure very well, effectively presses down motion artifacts. Add Graphene coating, enhance the electric conductivity of electrode greatly, improve the precision of ultra-weak electronic signal data acquisition. Electrode for encephalograms is made up of basal layer, textile conductive layers, the first suppression motion artifacts layer, packed layer, the second suppression motion artifacts layer, contacting surface layer and insulation barrier bed, can efficiently reduce noise, it is suppressed that motion artifacts from electrode structure.
The technical scheme is that a kind of suppression motion artifacts Graphene flexibility brain capacitive electrode. This electrode is made up of basal layer, textile conductive layers, the first suppression motion artifacts layer, packed layer, the second suppression motion artifacts layer, contacting surface layer and insulation barrier bed. It is characterized in that: flexible fabric constitutes described basal layer; Conductive fabric constitutes described textile conductive layers; First cushion and the first enhancement Layer constitute described first and suppress motion artifacts layer, and conductive sponge constitutes described first cushion, and conductive fabric constitutes described first enhancement Layer; Insulating rubber slab constitutes packed layer; Second enhancement Layer and the second cushion constitute described second and suppress motion artifacts layer, and conductive fabric constitutes described second enhancement Layer, add the second cushion described in conductive sponge composition; Graphene coating constitutes described contacting surface layer; Insulating fabrics constitutes described insulation barrier bed.
Preferably, described textile conductive layers is arranged on the base layer, places center and is bonded by medical viscose glue; Described first suppresses motion artifacts layer to be arranged in described textile conductive layers, places center and is bonded by conductive silver glue; Described first suppresses motion artifacts layer inner. layers to bond by conductive silver glue; Described packed layer is arranged on described first to be suppressed, on motion artifacts layer, place center and bonded by conductive silver glue; Described second suppresses motion artifacts layer to be arranged on described packed layer, places center and is bonded by conductive silver glue; Described second suppresses motion artifacts layer inner. layers to bond by conductive silver glue; Described contacting surface layer is arranged on described second to be suppressed, on motion artifacts layer, place center and bonded by conductive silver glue; Described insulating fabrics barrier bed center hollow out, is arranged in textile conductive layers, is completely covered and connects by sewing, fixes.
Preferably, flexible fabric is to have certain pliability and elastic Lycra cloth, is mainly used to support electrode. The pressure that fabric substrate is suitable had both ensured that electrode for encephalograms and human body fitted tightly, and ensured again the comfortableness of wearing.
Preferably, the base material of described three layers conductive fabric is polyester fiber, is plated with nickel and copper under high intensity, forms metalized surface, has the flexibility of brilliance, electric conductivity and excellent resistance to tortuous nature, and wearing comfort, the conducting impedance value on surface is less than or equal to 0.5 ��/m2, there is good conduction energy.
Preferably, the conductive fabric of described textile conductive layers is shaped as the circle of diameter 30-50mm, and thickness is less than or equal to 0.05mm. Its role is to support electrode, the conduction signal of telecommunication (being equivalent to wire).
Preferably, described first enhancement Layer and two conductive fabric need to soak in Graphene solvent, air-dry formation graphene conductive cloth, shape is the circle of diameter 20-40mm, and thickness is less than or equal to 0.05mm. Its effect is to increase electric conductivity and intensifier electrode so that it is be not susceptible to permanent deformation, to a certain extent, makes electrode contacting surface layer be close to skin surface, makes electrode and skin surface keep opposing parallel in the dynamic case, it is suppressed that motion artifacts.
Preferably, described first cushion and two conductive sponge produced by polymer composite foaming technique, foam uniform pore diameter, and conductive sponge is soft, is mainly composed of polyester sponge and metallic nickel, nonpoisonous and tasteless, and high resilience conducts electricity very well. Conductive sponge is directly and contact skin, its flexible nature can ensure that the comfortableness of wearing, also can play cushioning effect, self adaptation human body head outline when skin interacts with electrode, laminating and skin surface well, to reduce noise and to suppress motion artifacts.
Preferably, described first cushion conductive sponge is shaped as the circle of diameter 20-40mm, and thickness is 0.5mm. It act as the level slip offset or between buffering skin-substrate, to a certain degree offsets and buffering vertical extruding.
Preferably, described second cushion conductive sponge is shaped as the circle of diameter 20-40mm, and thickness is 0.5mm. It act as the micro-slip offsetting or cushioning skin-electrode and vertical extruding.
Preferably, described suppression motion artifacts layer offsets by cushion and enhancement Layer combined effect or cushions the substrate vibrations produced at the volley by people, slide or extruding, relative sliding between the electrode and the skin that bring, extruding, twist distortion, causes the electric double layer generation electric charge of skin-electrode to be redistributed and the motion artifacts that causes.
Preferably, described insulating rubber slab is shaped as the circle of diameter 20-40mm, and thickness is 0.1-0.5mm. Its material is polyurethane rubber, and breaking tenacity is be more than or equal to 5Mpa, and percentage elongation is 250%-280%, and hardness, less than or equal to 70 ��, has good pliability, not compressible at thickness direction. Serving as the capacitor dielectric of capacitive electrode in the electrodes, keep the distance between the first enhancement Layer and the second enhancement Layer to be basically unchanged, thus ensureing that electric capacity is constant, effectively suppressing motion artifacts.
Preferably, described electrode integral thickness, less than or equal to 3mm, when wearing in order to avoid producing foreign body sensation, affects wearing comfort. Global shape is the circle of diameter 20-40mm. Electrocardioelectrode need to be fitted chest feature, and too big size can affect its wearing comfort so that ecg-r wave is easily distorted; Too little size can weaken cardiac electrical useful signal.
Preferably, described Graphene is electrode core material, its purity more than 95%, conductivity 105The content of S/m, oxygen and sulfur is 0.5%, and metals content impurity is 100ppm, and specific surface area is 100-300m2/ g, coating layer thickness is 0.005mm. Electric conductivity that Graphene is excellent and high sensitivity can senses skin surface weak biological electric potential signal, improve the precision of ultra-weak electronic signal data acquisition.
Preferably, described insulating fabrics, thickness is 0.5-0.8mm, and overall width is 50-70mm, and length is the rectangle of 80-110mm, and center hollow out figure is electrode contacting surface layer shape. Insulating fabrics encapsulated electrode, isolation conductive layer and contact skin, it is to avoid produce interference signal.
Preferably, described insulating fabrics is connected with the sewing of fabric substrate sewing machine, fixes.
Accompanying drawing explanation
Fig. 1 is the structural representation suppressing motion artifacts Graphene flexibility brain capacitive electrode;
Fig. 2 is the structural representation suppressing motion artifacts Graphene flexibility brain capacitive electrode to cover insulation barrier bed;
Fig. 3 is brain electricity microneedle configuration schematic diagram of the prior art.
Wherein, 1 is flexible fabric; 2 is conductive fabric; 3 is conductive sponge; 4 is conductive fabric; 5 is insulating rubber slab; 6 is conductive fabric; 7 is conductive sponge; 8 is Graphene coating; 9 is insulating fabrics.
Detailed description of the invention
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, it is described in detail below in conjunction with the accompanying drawings and the specific embodiments. Those skilled in the art should know, following specific embodiment or detailed description of the invention, be the present invention it is that the set-up mode of series of optimum that concrete summary of the invention enumerate is explained further, and all can be combined with each other or interrelated use between those set-up modes, cannot be associated arranging or being used in conjunction with other embodiment or embodiment unless clearly proposed some of which or a certain specific embodiment or embodiment in the present invention. Meanwhile, following specific embodiment or embodiment are only used as optimized set-up mode, not as the understanding limiting protection scope of the present invention.
Embodiment
As it is shown in figure 1, for suppressing motion artifacts Graphene flexibility brain capacitive electrode structure chart, described electrode is made up of basal layer, textile conductive layers, the first suppression motion artifacts layer, packed layer, the second suppression motion artifacts layer, contacting surface layer and insulation barrier bed. It is characterized in that: flexible fabric 1 constitutes described basal layer; Conductive fabric 2 constitutes described textile conductive layers; First cushion and the first enhancement Layer constitute described first and suppress motion artifacts layer, and conductive sponge 3 constitutes described first cushion, and conductive fabric 4 constitutes described first enhancement Layer; Insulating rubber slab 5 constitutes packed layer; Second enhancement Layer and the second cushion constitute described second and suppress motion artifacts layer, and conductive fabric 6 constitutes described second enhancement Layer, conductive sponge 7 constitute described in add the second cushion; Graphene coating 8 constitutes described contacting surface layer; Insulating fabrics 9 constitutes described insulation barrier bed.
Wherein: described textile conductive layers is arranged on described basal layer, place center and bonded by medical viscose glue; Described first suppresses motion artifacts layer to be arranged in described textile conductive layers, places center and is bonded by conductive silver glue; Described first suppresses motion artifacts layer inner. layers to bond by conductive silver glue; Described packed layer is arranged on described first to be suppressed, on motion artifacts layer, place center and bonded by conductive silver glue; Described second suppresses motion artifacts layer to be arranged on described packed layer, places center and is bonded by conductive silver glue; Described second suppresses motion artifacts layer inner. layers to bond by conductive silver glue; Described contacting surface layer is arranged on described second to be suppressed, on motion artifacts layer, place center and bonded by conductive silver glue; Described insulating fabrics barrier bed center hollow out, is arranged in textile conductive layers, is completely covered and connects by sewing, fixes.
Described flexible fabric 1 is to have certain pliability and elastic Lycra cloth, is mainly used to support electrode as substrate. The pressure that fabric substrate is suitable had both ensured that electrode for encephalograms and human body fitted tightly, and ensured again the comfortableness of wearing.
The base material of described conductive fabric 2,4 and 6 is polyester fiber, is plated with nickel and copper under high intensity, forms metalized surface, has the flexibility of brilliance, electric conductivity and excellent resistance to tortuous nature, and wearing comfort, the conducting impedance value on surface is less than or equal to 0.5 ��/m2, there is good conduction energy.
The conductive fabric 2 of described textile conductive layers is shaped as the circle of diameter 30-50mm, and thickness is less than or equal to 0.05mm. Its role is to support electrode, the conduction signal of telecommunication (being equivalent to wire).
The conductive fabric 4 and 6 of described first enhancement Layer and the second enhancement Layer need to soak in Graphene solvent, and air-dry formation graphene conductive cloth, shape is the circle of diameter 20-40mm, and thickness is less than or equal to 0.05mm. Its effect is to increase electric conductivity and intensifier electrode so that it is be not susceptible to permanent deformation, to a certain extent, makes electrode contacting surface layer be close to skin surface, makes electrode and skin surface keep opposing parallel in the dynamic case, it is suppressed that motion artifacts.
The conductive sponge 3 and 7 of described first cushion and the second cushion is produced by polymer composite foaming technique, and foam uniform pore diameter, and conductive sponge is soft, is mainly composed of polyester sponge and metallic nickel, nonpoisonous and tasteless, and high resilience conducts electricity very well. Conductive sponge is directly and contact skin, its flexible nature can ensure that the comfortableness of wearing, also can play cushioning effect, self adaptation human body head outline when skin interacts with electrode, laminating and skin surface well, to reduce noise and to suppress motion artifacts.
Described first cushion conductive sponge 3 is shaped as the circle of diameter 20-40mm, and thickness is 0.5mm. It act as the level slip offset or between buffering skin-substrate, to a certain degree offsets and buffering vertical extruding.
Described second cushion conductive sponge 7 is shaped as the circle of diameter 20-40mm, and thickness is 0.5mm. It act as the micro-slip offsetting or cushioning skin-electrode and vertical extruding.
Described suppression motion artifacts layer offsets by cushion and enhancement Layer combined effect or cushions the substrate vibrations produced at the volley by people, slide or extruding, relative sliding between the electrode and the skin that bring, extruding, twist distortion, causes the electric double layer generation electric charge of skin-electrode to be redistributed and the motion artifacts that causes.
The circle being shaped as diameter 20-40mm of described insulating rubber slab 5, thickness is 0.1-0.5mm. Its material is polyurethane rubber, and breaking tenacity is be more than or equal to 5Mpa, and percentage elongation is 250%-280%, and hardness, less than or equal to 70 ��, has good pliability, not compressible at thickness direction. Serving as the capacitor dielectric of capacitive electrode in the electrodes, keep the distance between the first enhancement Layer and the second enhancement Layer to be basically unchanged, thus ensureing that electric capacity is constant, effectively suppressing motion artifacts.
Described electrode integral thickness, less than or equal to 3mm, when wearing in order to avoid producing foreign body sensation, affects wearing comfort. Global shape is the circle of diameter 20-40mm. Electrocardioelectrode need to be fitted chest feature, and too big size can affect its wearing comfort so that ecg-r wave is easily distorted; Too little size can weaken cardiac electrical useful signal.
Described Graphene coating 8 is electrode core material, and its purity is more than 95%, and conductivity is 105The content of S/m, oxygen and sulfur is 0.5%, and metals content impurity is 100ppm, and specific surface area is 100-300m2/ g, coating layer thickness is 0.005mm. Electric conductivity that Graphene is excellent and high sensitivity can senses skin surface weak biological electric potential signal, improve the precision of ultra-weak electronic signal data acquisition.
Described insulating fabrics 9 thickness is 0.5-0.8mm, and overall width is 50-70mm, and length is the rectangle of 80-110mm, and center hollow out figure is electrode contacting surface layer shape. Insulating fabrics encapsulated electrode, isolation conductive layer and contact skin, it is to avoid produce interference signal.
Described insulating fabrics 9 is connected with the sewing of fabric substrate sewing machine, fixes.
Claims (13)
1. suppressing a motion artifacts Graphene flexibility brain capacitive electrode, this electrode is made up of basal layer, textile conductive layers, the first suppression motion artifacts layer, packed layer, the second suppression motion artifacts layer, contacting surface layer and insulation barrier bed; It is characterized in that: flexible fabric constitutes described basal layer; Conductive fabric constitutes described textile conductive layers; First cushion and the first enhancement Layer constitute described first and suppress motion artifacts layer, and conductive sponge constitutes described first cushion, and conductive fabric constitutes described first enhancement Layer; Insulating rubber slab constitutes packed layer; Second enhancement Layer and the second cushion constitute described second and suppress motion artifacts layer, and conductive fabric constitutes described second enhancement Layer, and conductive sponge constitutes described second cushion; Graphene coating constitutes described contacting surface layer; Insulating fabrics constitutes described insulation barrier bed.
2. electrode according to claim 1, it is characterised in that: described textile conductive layers is arranged on the base layer, places center and is bonded by medical viscose glue; Described first suppresses motion artifacts layer to be arranged in described textile conductive layers, places center and is bonded by conductive silver glue; Described first suppresses motion artifacts layer inner. layers to bond by conductive silver glue; Described packed layer is arranged on described first to be suppressed, on motion artifacts layer, place center and bonded by conductive silver glue; Described second suppresses motion artifacts layer to be arranged on described packed layer, places center and is bonded by conductive silver glue; Described second suppresses motion artifacts layer inner. layers to bond by conductive silver glue; Described contacting surface layer is arranged on described second to be suppressed, on motion artifacts layer, place center and bonded by conductive silver glue; Described insulation barrier bed center hollow out, is arranged in textile conductive layers, is completely covered and connects by sewing, fixes.
3. electrode according to claim 1, it is characterised in that: described flexible fabric is to have certain pliability and elastic Lycra cloth.
4. electrode according to claim 1, it is characterised in that: the base material of described conductive fabric is polyester fiber, nickel plating and copper under high intensity, forms metalized surface, and the conducting impedance value on surface is less than or equal to 0.5 ��/m2��
5. electrode according to claim 1, it is characterised in that the conductive fabric of described textile conductive layers is shaped as the circle of diameter 30-50mm, and thickness is less than or equal to 0.05mm.
6. electrode according to claim 1, it is characterised in that the conductive fabric of described first enhancement Layer and the second enhancement Layer need to soak in Graphene solvent, air-dry formation graphene conductive cloth, shape is the circle of diameter 20-40mm, and thickness is less than or equal to 0.05mm.
7. electrode according to claim 1, it is characterized in that, the conductive sponge of described first cushion and the second cushion is produced by polymer composite foaming technique, foaming uniform pore diameter, being mainly composed of polyester sponge and metallic nickel, nonpoisonous and tasteless, conductive sponge is soft, high resilience, conducts electricity very well.
8. electrode according to claim 1, it is characterised in that the conductive sponge of described first cushion and the second cushion is shaped as the circle of diameter 20-40mm, and thickness is 0.5mm.
9. electrode according to claim 1, it is characterised in that described insulating rubber slab is shaped as the circle of diameter 20-40mm, thickness is 0.1-0.5mm, and its material is polyurethane rubber, and breaking tenacity is be more than or equal to 5Mpa, percentage elongation is 250%-280%, and hardness is less than or equal to 70 ��.
10. electrode according to claim 1, it is characterised in that described electrode integral thickness is less than or equal to 3mm, and global shape is the circle of diameter 20-40mm.
11. electrode according to claim 1, it is characterised in that described Graphene is electrode core material, its purity is more than 95%, and conductivity is 105The content of S/m, oxygen and sulfur is 0.5%, and metals content impurity is 100ppm, and specific surface area is 100-300m2/ g, coating layer thickness is 0.005mm.
12. electrode according to claim 1, it is characterised in that described insulating fabrics, thickness is 0.5-0.8mm, and overall width is 50-70mm, and length is the rectangle of 80-110mm, and center hollow out figure is electrode contacting surface layer shape.
13. electrode according to claim 1, it is characterised in that described insulating fabrics is connected with the sewing of fabric substrate sewing machine, fixes.
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| CN110313910A (en) * | 2019-06-20 | 2019-10-11 | 河北大学 | A kind of graphene for brain wave acquisition/polyacrylic acid copolymerized ester/textile flexibility combination electrode material and preparation method thereof |
| CN112244840A (en) * | 2019-07-02 | 2021-01-22 | 复旦大学附属中山医院 | Graphite carbon disk electrode and preparation method and use method thereof |
| CN113576483A (en) * | 2021-08-06 | 2021-11-02 | 中国科学院苏州生物医学工程技术研究所 | Wearable equipment |
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| WO2022203118A1 (en) * | 2021-03-26 | 2022-09-29 | 연세대학교 산학협력단 | Multi-channel array element using graphene composite electrode for brain insertion |
| KR20220134404A (en) * | 2021-03-26 | 2022-10-05 | 연세대학교 산학협력단 | Muti Channel Array Element Using Hybrid Graphene Electrode Brain Inserted |
| KR102568398B1 (en) | 2021-03-26 | 2023-08-21 | 연세대학교 산학협력단 | Muti Channel Array Element Using Hybrid Graphene Electrode Brain Inserted |
| CN113576483A (en) * | 2021-08-06 | 2021-11-02 | 中国科学院苏州生物医学工程技术研究所 | Wearable equipment |
| CN114366104A (en) * | 2022-01-14 | 2022-04-19 | 东南大学 | Depression state evaluation method based on forehead minority lead electroencephalogram monitoring |
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