A composite electroencephalic cap device

Abstract

This invention provides a composite EEG cap device, comprising a cap body, multiple composite electrodes mounted on the cap body, and a flexible circuit electrically connected to the composite electrodes. Each composite electrode includes an electrode unit and a conductive portion disposed at the bottom of the electrode unit. The cap body includes an outer layer and an inner layer. The outer layer has mounting holes that mate with the electrode units. The flexible circuit is disposed between the outer and inner layers. The electrode units are mounted on the outer layer and electrically connected to the flexible circuit. The conductive portion abuts against the inner layer. This composite EEG cap device utilizes a composite electrode that integrates the functions of dry and wet electrodes. A conductive portion is disposed at the bottom of the composite electrode, contacting the inner layer of the cap body. During use, the electrode unit can be controlled to compress the conductive portion as needed, causing electrolyte to seep out and permeate the inner fabric, dynamically maintaining low impedance.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a composite EEG cap device. Background Technology

[0002] Electroencephalography (EEG) is a non-invasive electrophysiological monitoring method that records brain electrical activity. This method is typically implemented using an EEG cap, which is worn on the head with electrodes in contact with the scalp to record spontaneous electrical activity in the brain over a period of time. The number of EEG signal channels determines the amount of information that can be processed; the more electrodes and leads on the EEG cap, the more EEG signals can be detected.

[0003] Currently, EEG caps on the market are mainly divided into two categories based on electrode type: dry electrode EEG caps and wet electrode EEG caps.

[0004] However, both types of EEG caps have their own advantages and disadvantages:

[0005] As shown in existing technologies such as CN 222565818 U, CN 218852713 U, and CN 118845043 A, the electrodes of the dry electrode EEG cap are in direct contact with the scalp, without the need for any electrolytes. The advantages are that it eliminates the need for conductive gel, is convenient to use, and avoids the hassle of washing hair after use. The disadvantages are: higher impedance, relatively poorer signal quality, and a tendency to generate artifacts; furthermore, the rigid electrodes exert significant pressure on the scalp, leading to pressure marks or pain with prolonged wear.

[0006] As shown in existing technologies such as CN116671937A, CN221786299U, and CN107582052A, wet electrode EEG caps require the injection of electrolytes between the electrodes and the scalp. The advantages are high signal-to-noise ratio, good signal transmission quality, and low impedance. The disadvantages are: (1) Cumbersome operation: the conductive paste needs to be applied precisely, and the wearing and cleaning process is time-consuming. The conductive paste is also easy to dry (it needs to be manually replenished every 1-2 hours); (2) the electrolyte (conductive paste) of the existing wet electrode EEG caps will generally come into direct contact with the user's scalp, which can easily irritate the skin. Long-term contact may cause allergies or contact dermatitis; (3) Movement restriction: the conductive paste is easy to overflow due to head movement, which can contaminate the equipment and clothing. Utility Model Content

[0007] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a composite EEG cap device, which can at least solve one of the problems in the prior art.

[0008] To achieve the above and other related objectives, this utility model provides a composite EEG cap device, including a cap body, a plurality of composite electrodes mounted on the cap body, and a flexible circuit electrically connected to the composite electrodes.

[0009] The composite electrode includes an electrode unit and a conductive portion disposed at the bottom end of the electrode unit;

[0010] The cap body includes an outer layer and an inner layer. The outer layer has mounting holes that mate with the electrode unit. A flexible circuit is disposed between the outer layer and the inner layer. The electrode unit is mounted on the outer layer and electrically connected to the flexible circuit. The conductive part abuts against the inner layer.

[0011] In one embodiment of this utility model, the electrode unit includes a first housing, an electrode head, an air bladder, and an air pump. A first receiving space is formed inside the first housing. The air bladder is installed in the first receiving space. The electrode head is movably installed in the first housing and cooperates with the air bladder. The air pump is installed on the electrode head and cooperates with the air bladder. A conductive part is installed at the end of the electrode head away from the air bladder. By controlling the air pump, the volume of the air bladder can change, thereby pushing the electrode head to move. Therefore, this utility model provides a novel electrode unit structure that integrates an air bladder structure. By controlling the air pump, the air bladder can be inflated and deflated, thereby changing its volume. The change in the air bladder's volume can cause the electrode head to move, causing a change in the pressure between the electrode head and the scalp, achieving an adaptive and dynamic adjustment effect, rather than the mechanically forced "adversarial contact" of traditional dry electrodes. This can meet the usage needs of various head shapes, offering strong applicability and low cost.

[0012] In one embodiment of the present invention, the electrode unit further includes a telescopic pusher, which is movably fitted into the first housing and located within the first accommodating space. The electrode head is fixedly connected to the telescopic pusher, and the airbag cooperates with the telescopic pusher.

[0013] In one embodiment of this utility model, the electrode unit further includes an elastic support base, which is disposed within the first accommodating space and located between the telescopic pusher and the first housing. Thus, the elastic support base allows the electrode head to float up and down with changes in the airbag volume, facilitating floating contact between the electrode head and the scalp, further reducing pressure, and also providing a buffer against external vibrations.

[0014] In one embodiment of the present invention, the electrode unit further includes a first cover, which is installed on the end of the first housing away from the electrode head and together with the first housing to form a first accommodating space.

[0015] In one embodiment of the present invention, the electrode unit further includes a second housing, a second cover, and a circuit board. The second housing is fitted onto the first housing and has a second accommodating space inside. The circuit board is disposed in the second accommodating space and is electrically connected to the electrode head. The circuit board is electrically connected to the flexible circuit. The second cover is installed on the second housing and together with the second housing to form the second accommodating space. The second cover is in contact with the first cover.

[0016] In one embodiment of this utility model, a first magnetic chuck is provided on the circuit board, and a second magnetic chuck is fitted onto the second cover, with the first and second magnetic chucks magnetically engaging. This facilitates detachment and makes it convenient to repair the circuit components.

[0017] In one embodiment of this utility model, the composite electrode further includes a first fixing member, a second fixing member, and a fixing cap. The first fixing member and the second fixing member are fitted around the outer periphery of the electrode unit and can jointly clamp the outer layer. The fixing cap is detachably engaged with the electrode unit and the first fixing member. This facilitates the installation of the composite electrode. Specifically, the cap body is provided with an installation hole. The first fixing member and the second fixing member clamp the cap body. The composite electrode is inserted into the installation hole, and the electrode unit is fixed to the cap body through the threaded engagement of the fixing cap with the second housing of the electrode unit and the first fixing member.

[0018] In one embodiment of this utility model, the outer layer is made of a high-elasticity fiber substrate, and the inner layer is made of nano-silver coated polyester fiber fabric. Thus, the outer layer, made of a high-elasticity fiber substrate (such as polyester fiber + silicone coating), possesses tear resistance and moderate rigidity, providing support to maintain the shape of the cap, preventing overall deformation due to airbag expansion, fixing the geometric position of the electrodes and airbag array, and concealing air passages and electrical wiring. The inner layer, made of nano-silver coated polyester fiber fabric, inhibits bacterial growth. Simultaneously, since the inner layer directly contacts the scalp, it provides a stable conductive interface and allows for moisture wicking, reducing the stuffiness caused by prolonged wear.

[0019] The outer layer is made of a highly elastic fiber substrate (such as polyester fiber + silicone coating), which has tear resistance and moderate rigidity, provides support for the cap body to maintain the shape of the cap body, prevents the airbag from expanding and causing overall deformation, fixes the geometric position of the electrodes and airbag array, and can hide the air passage pipes and circuit wiring.

[0020] In one embodiment of this invention, the composite EEG cap device further includes a data acquisition unit. Electrode wires are led out from the electrode units and connected to a flexible circuit, and then connectors are led out from the flexible circuit and connected to the data acquisition unit. This enables shunt control of all electrode units, and the flexible circuit can be used for signal transmission, while being isolated from the airbags inside the electrode units to reduce interference.

[0021] In one embodiment of this invention, the conductive part is a conductive hydrogel. Therefore, the surface of the conductive hydrogel has a microporous structure. When the airbag is inflated to a certain extent, the conductive hydrogel, under pressure, will exude electrolyte to the scalp, thereby reducing interfacial impedance and dynamically maintaining low impedance.

[0022] As described above, the composite EEG cap device of this invention has the following beneficial effects:

[0023] 1. This utility model provides a novel composite EEG cap device. The composite EEG cap device adopts a composite electrode that integrates the functions of dry and wet electrodes. A conductive part is provided at the bottom of the composite electrode, which is in contact with the inner layer of the cap. When in use, the electrode unit can be controlled to squeeze the conductive part according to actual needs, so that the conductive part seeps out electrolyte and permeates the inner layer fabric, dynamically maintaining low impedance. In addition, the inner layer is made of nano-silver coated polyester fiber fabric, which can inhibit bacterial growth. At the same time, the inner layer is in direct contact with the scalp, which can provide a stable conductive interface and also allows for moisture permeability and sweat wicking, reducing the stuffiness caused by long-term wear.

[0024] 2. This utility model provides a novel electrode unit with an integrated airbag structure. The airbag can be inflated and deflated by controlling the air pump, thereby changing the size of the airbag. The change in the size of the airbag can cause the electrode head to move, which in turn changes the pressure between the electrode head and the scalp, achieving an adaptive and dynamic adjustment effect, rather than the mechanically forced "confrontational contact" of the traditional structure. It can meet the usage needs of various head shapes, has strong applicability, and is low in cost.

[0025] 3. This composite electrode overcomes the shortcomings of traditional dry and wet electrodes, and combines the advantages of both. It has many advantages such as compact structure, small size, replaceability, low maintenance cost, meeting wearing comfort, and adaptability to different head sizes.

[0026] 4. The signal quality of this composite EEG cap device has advantages over existing technologies because: (1) It uses an airbag to achieve dynamic fit and ensures close contact between the electrode head and the scalp through precise pressure control, eliminating local high impedance caused by differences in head shape; (2) Mechanical-electrical decoupling: the second shell with built-in circuit board is connected to the first shell by magnetic attraction, and flexible circuit and elastic wire are used to effectively isolate the mechanical disturbance of the electrodes caused by head movement and reduce the friction potential; (3) Intelligent electrolyte management: the conductive part at the bottom of the electrode head will seep out electrolyte when it is pressed, continuously refreshing the ionic environment of the electrode interface, effectively solving the problem of gel drying that is easy to occur in traditional wet electrodes.

[0027] 5. The wearing comfort of this composite EEG cap device is superior to that of the existing technology because: (1) The local pressure peak of the traditional dry electrode EEG cap is greater than 20 kPa, while the composite electrode of this utility model adopts the form of flexible drive electrode head with air bag, ensuring that the maximum pressure is less than 15 kPa and intelligently adjusting the pressure of the sensitive area; (2) It adopts the combination of conductive part and inner layer made of antibacterial fabric with nano silver coating, which can inhibit bacterial growth while ensuring breathability and reducing the risk of skin allergies from long-term wear; (3) The structure is similar to an air bag, and the multi-cavity air bag realizes the vertical displacement and angle self-adaptation of the electrode unit, avoiding hard contact between the electrode unit and the scalp.

[0028] 6. The adaptability of this composite EEG cap device is superior to that of existing technologies because: in order to meet the needs of people with different head shapes, traditional EEG caps need to be designed with multiple cap sizes, while the EEG cap of this utility model can adaptively expand the air bladder to meet the needs of users with different head shapes. Moreover, the air bladder of each electrode unit can be dynamically adjusted through the control program algorithm to ensure contact stability under different movement states, thus solving the problem that traditional dry electrode EEG caps rely on high pressure penetration and are prone to damaging hair follicles.

[0029] 7. The long-term stability and maintainability of the composite EEG cap device are superior to the existing technology because: (1) it adopts a conductive part with self-healing function and a magnetic quick-release scheme, which makes it easy to replace components; (2) the electrode head, air bag and circuit board are assembled in layers, and only the corresponding module needs to be replaced when damaged; (3) it is easy and quick to clean: traditional wet electrode EEG caps need to be wiped with alcohol, which takes a long time to clean; traditional dry electrode EEG caps are difficult to clean thoroughly, and the composite electrode of the composite EEG cap device of this utility model can be disassembled and cleaned.

[0030] 8. The composite EEG cap device of this utility model can dynamically adapt to the curvature of the scalp, eliminate the influence of head shape differences, and realize the leap from "passive adaptation" to "active fit" of the EEG cap. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of the composite EEG cap device of this utility model;

[0032] Figure 2 for Figure 1 One of the side view schematic diagrams of the composite EEG cap device shown, with the omitted portion of the structure;

[0033] Figure 3 for Figure 1 The second side view of the composite EEG cap device shown, with the omitted portion of the structure;

[0034] Figure 4 for Figure 1The third side view of the composite EEG cap device shown, with the omitted portion of the structure;

[0035] Figure 5 This is a cross-sectional structural diagram of the composite electrode and the cap body of this utility model.

[0036] Figure 6 This is a schematic diagram of the exploded structure of the composite electrode of this utility model;

[0037] Figure 7 This is a three-dimensional structural diagram of the composite electrode of this utility model with some parts omitted.

[0038] Figure 8 for Figure 7 A schematic diagram of the cross-sectional structure of the composite electrode shown;

[0039] Figure 9 for Figure 7 The diagram shows the exploded structure of the composite electrode.

[0040] Figure 1-9 The reference numerals in the attached figures are as follows: a-cap body; b-composite electrode; c-flexible circuit; d-elastic band; e-collector; a1-outer layer; a2-inner layer; b1-electrode unit; b2-conductive part; b3-first fixing component; b4-second fixing component; b5-fixing cap; a11-mounting hole; 1-first housing; 2-electrode head; 3-airbag; 4-air pump; 5-telescopic pushing component; 6-elastic support base; 7-circuit board; 8-first cover; 9-second housing; 11-second cover; 12-first magnetic suction component; 13-second magnetic suction component; 14-first accommodating space; 15-second accommodating space. Detailed Implementation

[0041] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0042] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0043] Please see Figures 1-9 This utility model provides a composite EEG cap device according to the following embodiments, which belongs to the field of medical device technology. It can overcome the defects of traditional wet electrode EEG caps and dry electrode EEG caps, while having the advantages of both wet electrode EEG caps and dry electrode EEG caps.

[0044] like Figure 1-9 As shown, this utility model provides one embodiment of a composite EEG cap device.

[0045] The composite EEG cap device includes a cap body a, multiple composite electrodes b installed on the cap body a, and a flexible circuit c electrically connected to the composite electrodes b.

[0046] The composite electrode b includes an electrode unit b1 and a conductive part b2 disposed at the bottom end of the electrode unit b1;

[0047] The cap body a includes an outer layer a1 and an inner layer a2. The outer layer a1 has a mounting hole a11 that mates with the electrode unit b1. The flexible circuit c is disposed between the outer layer a1 and the inner layer a2. The electrode unit b1 is mounted on the outer layer a1 and electrically connected to the flexible circuit c. The conductive part b2 abuts against the inner layer a2.

[0048] In this embodiment, the electrode unit b1 includes a first housing 1, an electrode head 2, an air bladder 3, and an air pump 4. A first receiving space 14 is formed inside the first housing 1. The air bladder 3 is installed in the first receiving space 14. The electrode head 2 is movably installed in the first housing 1 and cooperates with the air bladder 3. The air pump 4 is installed in the electrode head 2 and cooperates with the air bladder 3. A conductive part b2 is installed at the end of the electrode head 2 away from the air bladder 3. By controlling the air pump 4, the volume of the air bladder 3 can change, thereby pushing the electrode head 2 to move. Therefore, this invention provides a novel electrode unit b1 structure. This electrode unit b1 integrates an air bladder structure, which can inflate and deflate the air bladder 3 by controlling the air pump 4, thereby changing the size of the air bladder 3. The change in the volume of the air bladder 3 can drive the electrode head 2 to move, causing a change in the pressure between the electrode head 2 and the scalp, achieving an adaptive and dynamic adjustment effect, rather than the mechanically forced "adversarial contact" of traditional structures. This can meet the usage needs of various head shapes, is highly applicable, and has low cost.

[0049] Preferably, the airbag 3 can be made of a double-layer thermoplastic TPU film and sealed by laser welding.

[0050] As a further preferred option, airbag 3 is a multi-cavity airbag.

[0051] In this embodiment, the air pump 4 is a piezoelectric ceramic air pump, which has the advantages of small size, light weight, low energy consumption and low noise.

[0052] Preferably, the piezoelectric ceramic air pump can be 21mm×19mm×3.2mm in size and can ensure that the maximum pressure is less than 15Kpa (the local pressure peak of the traditional dry electrode EEG cap is >20Kpa).

[0053] The working principle of a piezoelectric ceramic air pump is to use the vibration of a piezoelectric oscillator to pump gas. When a voltage is applied, the piezoelectric ceramic deforms, propelling the gas flow. Conversely, when the gas pressure changes, it may apply mechanical stress to the piezoelectric oscillator, causing it to generate an electrical signal; this is the positive piezoelectric effect.

[0054] The piezoelectric ceramic air pump's properties allow for pressure detection without the need for an additional pressure sensor. The principle is as follows: It detects changes in the electrical signal generated by the positive piezoelectric effect to reflect pressure changes, thus functioning as a pressure sensor. Specifically, it requires amplifiers, analog-to-digital converters, etc. When the pressure changes, the charge or voltage signal generated by the piezoelectric ceramic is amplified, processed, and converted into a pressure value. Then, the weak electrical signal is converted into a measurable value through circuitry such as a charge amplifier and analog-to-digital converter.

[0055] Of course, a MEMS (Micro-Electro-Mechanical Systems) sensor can also be installed inside the piezoelectric ceramic air pump. The MEMS sensor and the piezoelectric ceramic air pump can be used together, and their collaborative work can achieve more precise pressure control, status monitoring, or closed-loop feedback.

[0056] In this embodiment, the electrode unit b1 further includes a telescopic pusher 5, which is movably fitted into the first housing 1 and located within the first accommodating space 14. The electrode head 2 is fixedly connected to the telescopic pusher 5, and the airbag 3 cooperates with the telescopic pusher 5.

[0057] Preferably, the telescopic pusher 5 is fixedly connected to the electrode head 2 by welding or other means.

[0058] In this embodiment, the electrode unit b1 further includes an elastic support base 6, which is disposed within the first accommodating space 14 and located between the telescopic pusher 5 and the first housing 1.

[0059] Preferably, the elastic support base 6 can be a silicone spring structure.

[0060] Therefore, the elastic support base 6 allows the electrode head 2 to float up and down with the volume change of the airbag 3, which facilitates the floating contact between the electrode head 2 and the scalp, further reducing the feeling of pressure, and at the same time has the function of buffering external vibration.

[0061] In this embodiment, the electrode unit b1 further includes a first cover 8, which is installed on the end of the first housing 1 away from the electrode head 2 and together with the first housing 1 to form a first accommodating space 14.

[0062] In this embodiment, the electrode unit b1 further includes a second housing 9, a second cover 11, and a circuit board 7. The second housing 9 is fitted onto the first housing 1 and has a second receiving space 15 inside. The circuit board 7 is disposed in the second receiving space 15 and is electrically connected to the electrode head 2. The circuit board 7 is electrically connected to the flexible circuit c. The second cover 11 is installed on the second housing 9 and together with the second housing 9, they enclose the second receiving space 15. The second cover 11 is attached to the first cover 8.

[0063] In this embodiment, a first magnetic clasp 12 is provided on the circuit board 7, and a second magnetic clasp 13 is fitted on the second cover 11. The first magnetic clasp 12 and the second magnetic clasp 13 are magnetically attracted to each other. This facilitates disassembly and makes it convenient to repair the circuit board 7 and replace the first magnetic clasp 12 and the second magnetic clasp 13.

[0064] Preferably, the first magnetic attractor 12 and the second magnetic attractor 13 can be circular sheet magnets.

[0065] In this embodiment, the composite electrode b further includes a first fixing member b3, a second fixing member b4, and a fixing cap b5. The first fixing member b3 and the second fixing member b4 are fitted around the outer periphery of the electrode unit b1 and can jointly clamp the outer layer a1. The fixing cap b5 is detachably engaged with the electrode unit b1 and the first fixing member b3. This facilitates the installation of the composite electrode b. Specifically, the cap body a is provided with a mounting hole a11. The first fixing member b3 and the second fixing member b4 clamp the cap body a. The composite electrode b is inserted into the mounting hole a11. The electrode unit b1 is fixed to the cap body a by the threaded engagement of the fixing cap b5 with the second housing 9 of the electrode unit b1 and the first fixing member b3.

[0066] Preferably, the outer periphery of the first fixing member b3 is provided with a first thread, the outer wall of the second housing 9 is provided with a second thread, and the inner wall of the fixing cap b5 is provided with a third thread that mates with the first thread and the second thread.

[0067] The specific installation method of the composite electrode b in this embodiment is as follows: An installation hole a11 is pre-set on the outer layer a1. The first fixing member b3 and the second fixing member b4 clamp the outer layer a1. The electrode unit b1 is inserted into the installation hole a11. The first fixing member b3 and the second fixing member b4 can be fixedly connected to the cap body a by means of hot pressing, ultrasonic welding, or adhesive bonding. Finally, the electrode unit b1 is fixed to the cap body a by the threaded engagement of the fixing cap b5 with the second housing 9 of the electrode unit b1 and the first fixing member b3, thus completing the installation.

[0068] In this embodiment, the outer layer a1 is made of a highly elastic fiber substrate, and the inner layer a2 is made of nano-silver coated polyester fiber fabric. Thus, the outer layer a1, made of a highly elastic fiber substrate (such as polyester fiber + silicone coating), has tear resistance and moderate rigidity, providing support for the cap a to maintain the shape of the cap a, preventing the airbag 3 from expanding and causing overall deformation, and playing a role in fixing the geometric position of the composite electrode b array, and can also hide the air passage pipes and circuit wiring.

[0069] In this embodiment, the composite EEG cap device also includes a data acquisition unit e. Electrode wires are led out from electrode units b1 and connected to a flexible circuit c, and then connectors are led out from the flexible circuit c and connected to the data acquisition unit e. Thus, shunt control of all electrode units b1 can be achieved, and the flexible circuit c can be used for signal transmission, which is isolated from the air bladder 3 inside the electrode units b1 to reduce interference.

[0070] Preferably, the electrode wire can be directly led out from the electrode head 2 and connected to the flexible circuit c, or the electrode wire can be led out from the circuit board 7 and connected to the flexible circuit c.

[0071] In this embodiment, the conductive part b2 is a conductive hydrogel. Therefore, the conductive hydrogel has a microporous structure on its surface. When the airbag 3 is inflated to a certain extent, the conductive hydrogel is pressurized and will exude electrolyte to the scalp to reduce interfacial impedance and dynamically maintain low impedance.

[0072] Preferably, the conductive part b2 can be a biocompatible conductive hydrogel, specifically a polyvinyl alcohol (PVA)-polypyrrole (PPy) composite hydrogel with a conductivity >10S / m, a water content of 80%, and a Shore hardness of 15A.

[0073] Therefore, the conductive hydrogel surface has a microporous structure. When the airbag 3 is inflated, it moves the electrode head 2. The electrode head 2 squeezes the conductive part b2. When the conductive part b2 is compressed to a certain extent, the electrolyte will automatically seep out to the scalp to reduce the interfacial impedance between the electrode head 2 and the scalp, thereby achieving the technical effect of dynamically maintaining low impedance.

[0074] In addition, in order to achieve wearability, the composite EEG cap device of this embodiment also includes an elastic band d that fits with the user's jaw. The two ends of the elastic band d are connected to the cap body a, specifically, they can be fixedly connected to the outer layer a1 or the inner layer a2 by adhesive or other means.

[0075] As described above, the composite EEG cap device of this invention has at least the following advantages over the prior art:

[0076] 1. This utility model provides a novel composite EEG cap device. The composite EEG cap device adopts a composite electrode b that integrates the functions of dry and wet electrodes. A conductive part b2 is provided at the bottom of the composite electrode b. The conductive part b2 is in contact with the inner layer a2 of the cap body a. When in use, the electrode unit b1 can be controlled to squeeze the conductive part b2 according to actual needs, so that the conductive part b2 seeps out electrolyte and permeates the inner layer a2 fabric, dynamically maintaining low impedance. In addition, the inner layer a2 is made of nano-silver coated polyester fiber fabric, which can inhibit bacterial growth. At the same time, the inner layer a2 is in direct contact with the scalp, which can provide a stable conductive interface and also allows for moisture permeability and sweat wicking, reducing the stuffiness caused by long-term wear.

[0077] 2. This utility model provides a novel electrode unit b1 with an integrated airbag structure. The airbag 3 can be inflated and deflated by controlling the air pump 4, thereby changing the size of the airbag 3. The change in the size of the airbag 3 can cause the electrode head 2 to move, thus changing the pressure between the electrode head 2 and the scalp. This achieves an adaptive and dynamic adjustment effect, rather than the mechanically forced "confrontational contact" of traditional structures. It can meet the usage needs of various head shapes, has strong applicability, and is low in cost.

[0078] 3. This composite electrode b overcomes the shortcomings of traditional dry and wet electrodes, and combines the advantages of both. It has many advantages such as compact structure, small size, replaceability, low maintenance cost, meeting wearing comfort, and adaptability to different head sizes.

[0079] 4. The signal quality of this composite EEG cap device has advantages over existing technologies because: (1) It uses an airbag 3 to achieve dynamic fit and ensures that the electrode head 2 is in close contact with the scalp through precise pressure control, thus eliminating local high impedance caused by differences in head shape; (2) Mechanical-electrical decoupling: the second shell 9 with built-in circuit board 7 is connected to the first shell 1 by magnetic attraction, and flexible circuit c and elastic wire are used to effectively isolate the mechanical disturbance of the electrodes caused by head movement and reduce the friction potential; (3) Intelligent electrolyte management: the conductive part b2 at the bottom of the electrode head 2 will seep out electrolyte when it is pressed, continuously refreshing the ionic environment of the electrode interface, effectively solving the problem of gel drying that is easy to occur in traditional wet electrodes.

[0080] 5. The wearing comfort of this composite EEG cap device is superior to that of the existing technology because: (1) The local pressure peak of the traditional dry electrode EEG cap is greater than 20 kPa, while the composite electrode b of this utility model adopts the form of flexible drive electrode head 2 with air bag 3 to ensure that the maximum pressure is less than 15 kPa and intelligently adjusts the pressure of sensitive areas; (2) The conductive part b2 is combined with the inner layer a2 made of antibacterial fabric with nano-silver coating, which can inhibit bacterial growth while ensuring breathability and reducing the risk of skin allergies from long-term wear; (3) The structure is similar to an air bag, and the multi-cavity air bag 3 realizes the vertical displacement and angle self-adaptation of the electrode unit b1, avoiding hard contact between the electrode unit b1 and the scalp.

[0081] 6. The adaptability of this composite EEG cap device is superior to that of existing technologies because: in order to meet the needs of people with different head shapes, traditional EEG caps need to be designed with multiple sizes of cap body a, while the EEG cap of this utility model can adaptively expand through the air bladder 3 to meet the needs of users with different head shapes. Moreover, the air bladder 3 of each electrode unit b1 can be dynamically adjusted through the control program algorithm to ensure contact stability under different movement states, thus solving the problem that traditional dry electrode EEG caps rely on high pressure penetration and are prone to damaging hair follicles.

[0082] 7. The long-term stability and maintainability of the composite EEG cap device are superior to the existing technology because: (1) it adopts a self-healing conductive part b2 with a magnetic quick-release scheme, which makes it easy to replace components; (2) the electrode head 2, air bag 3, and circuit board 7 are assembled in layers, and only the corresponding module needs to be replaced when damaged; (3) it is easy and quick to clean: traditional wet electrode EEG caps need to be wiped with alcohol, which takes a long time to clean; traditional dry electrode EEG caps are difficult to clean thoroughly, and the composite electrode b of the composite EEG cap device of this utility model can be disassembled and cleaned.

[0083] 8. The composite EEG cap device of this utility model can dynamically adapt to the curvature of the scalp, eliminate the influence of head shape differences, and realize the leap from "passive adaptation" to "active fit" of the EEG cap.

[0084] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A composite EEG cap device, characterized in that, It includes a cap body (a) and a plurality of composite electrodes (b) mounted on the cap body (a), and a flexible circuit (c) electrically connected to the composite electrodes (b); The composite electrode (b) includes an electrode unit (b1) and a conductive portion (b2) disposed at the bottom end of the electrode unit (b1); The cap body (a) includes an outer layer (a1) and an inner layer (a2). The outer layer (a1) has a mounting hole (a11) that mates with the electrode unit (b1). The flexible circuit (c) is disposed between the outer layer (a1) and the inner layer (a2). The electrode unit (b1) is mounted on the outer layer (a1) and electrically connected to the flexible circuit (c). The conductive part (b2) abuts against the inner layer (a2).

2. The composite EEG cap device according to claim 1, characterized in that, The electrode unit (b1) includes a first housing (1), an electrode head (2), an air bladder (3), and an air pump (4). The first housing (1) has a first accommodating space (14) inside. The air bladder (3) is installed in the first accommodating space (14). The electrode head (2) is movably installed in the first housing (1) and cooperates with the air bladder (3). The air pump (4) is installed in the electrode head (2) and cooperates with the air bladder (3). The conductive part (b2) is installed at the end of the electrode head (2) away from the air bladder (3). By controlling the air pump (4), the volume of the air bladder (3) can be changed, thereby pushing the electrode head (2) to move.

3. The composite EEG cap device according to claim 2, characterized in that, The electrode unit (b1) further includes a telescopic pusher (5), which is movably fitted into the first housing (1) and located in the first accommodating space (14). The electrode head (2) is fixedly connected to the telescopic pusher (5), and the airbag (3) cooperates with the telescopic pusher (5).

4. The composite EEG cap device according to claim 3, characterized in that, The electrode unit (b1) further includes an elastic support base (6), which is disposed in the first accommodating space (14) and located between the telescopic pusher (5) and the first housing (1).

5. The composite EEG cap device according to claim 4, characterized in that, The electrode unit (b1) further includes a first cover (8), which is installed at the end of the first housing (1) away from the electrode head (2) and together with the first housing (1) forms the first accommodating space (14).

6. The composite EEG cap device according to claim 5, characterized in that, The electrode unit (b1) further includes a second housing (9), a second cover (11), and a circuit board (7). The second housing (9) is fitted onto the first housing (1) and has a second accommodating space (15) inside. The circuit board (7) is disposed in the second accommodating space (15) and is electrically connected to the electrode head (2). The circuit board (7) is electrically connected to the flexible circuit (c). The second cover (11) is installed on the second housing (9) and together with the second housing (9) forms the second accommodating space (15). The second cover (11) is in contact with the first cover (8).

7. The composite EEG cap device according to claim 6, characterized in that, The circuit board (7) is provided with a first magnetic absorbing element (12), and the second cover (11) is fitted with a second magnetic absorbing element (13). The first magnetic absorbing element (12) and the second magnetic absorbing element (13) are magnetically attracted to each other.

8. The composite EEG cap device according to any one of claims 1-7, characterized in that, The composite electrode (b) further includes a first fixing member (b3), a second fixing member (b4), and a fixing cap (b5). The first fixing member (b3) and the second fixing member (b4) are fitted around the outer periphery of the electrode unit (b1) and can jointly clamp the outer layer (a1). The fixing cap (b5) is detachably engaged with the electrode unit (b1) and the first fixing member (b3).

9. The composite EEG cap device according to any one of claims 1-7, characterized in that, The outer layer (a1) is made of a high-elasticity fiber substrate, and the inner layer (a2) is made of nano-silver coated polyester fiber fabric.

10. The composite EEG cap device according to any one of claims 1-7, characterized in that, It also includes a collector (e), wherein the electrode unit (b1) leads out an electrode wire and connects it to the flexible circuit (c), and then the flexible circuit (c) leads out a connector and connects it to the collector (e).

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