Electroencephalogram synchronous acquisition system
The EEG synchronous acquisition system, constructed using graphene flexible electrodes and star-flash wireless communication technology, solves the problems of large size and low resource utilization of traditional EEG acquisition devices, and realizes efficient and real-time observation and diagnosis of EEG signals from multiple people.
Patent Information
- Application Number
- CN202422453691.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-10-11
AI Technical Summary
Existing EEG acquisition devices are large, expensive, and have low resource utilization. Traditional head-mounted electrodes require long-term maintenance with conductive gel and are not suitable for long-term use. Bluetooth and Wi-Fi transmission methods have problems with insufficient transmission speed and latency.
The system employs graphene flexible electrodes and electrode fixing structures, combined with starlight wireless communication technology to construct a two-level communication network, enabling one-to-many wireless synchronous acquisition of EEG signals. Graphene coatings are used as conductive electrodes, and common-mode noise is suppressed through inverting circuits and differential amplifier circuits. Operational amplification and filters are used to process the signals.
It improves the quality of EEG signal transmission, simplifies electrode structure, reduces signal attenuation, enables real-time observation and efficient diagnosis of multiple EEG signals, and improves signal-to-noise ratio and diagnostic efficiency.
Smart Images
Figure CN223489738U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of electroencephalogram (EEG) acquisition equipment, and in particular relates to an EEG synchronous acquisition system. Background Technology
[0002] Existing brainwave acquisition systems can acquire patients' electroencephalogram (EEG) signals, which, after processing and display, assist doctors in diagnosing the condition. However, since the frequency of general human head EEG signals is 0.5-50Hz and the potential is only about 50μV, which is very weak, traditional EEG acquisition devices usually adopt a limited transmission method in terms of signal transmission to avoid interference from the environment. In reality, traditional EEG acquisition devices are not only bulky and expensive, but each device can only diagnose one patient at a time, resulting in a waste of EEG acquisition device resources.
[0003] Traditional EEG acquisition systems primarily rely on head-mounted EEG electrodes to acquire EEG signals. To obtain accurate EEG signals, the resistance between the electrodes and the cerebral cortex needs to be maintained below 5k ohms. This requires manual injection of conductive gel into the electrode area to be tested. However, the conductivity of the conductive gel weakens over time, making it unsuitable for prolonged use. Furthermore, the application of conductive gel can cause symptoms such as redness, swelling, and itching in patients, causing discomfort. After each patient is tested, the electrode caps need to be replaced and conductive gel injected again, making the testing process not only complex but also resulting in very low equipment utilization.
[0004] While there has been research on wireless transmission for EEG signals, current methods are limited to Bluetooth and Wi-Fi. Bluetooth suffers from limitations in transmission speed and latency, while Wi-Fi faces issues with asynchronous transmission and system efficiency. In contrast, StarFlash wireless communication technology boasts superior characteristics such as ultra-low latency, high reliability, high speed, interference resistance, precise synchronization, and support for multiple concurrent low-power operations. These features perfectly address the challenges of low frequency, susceptibility to interference, and latency in wireless EEG signal transmission. Utility Model Content
[0005] In view of this, the present invention aims to provide a synchronous EEG acquisition system, which uses graphene flexible electrodes and electrode fixing structures to ensure complete acquisition of EEG signals and avoid damage to the brain skin; in addition, it uses star flash technology to build a two-level communication network to realize one-to-many wireless synchronous acquisition of EEG signals, thereby improving diagnostic efficiency.
[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows:
[0007] A synchronous EEG acquisition system includes an EEG receiving module and at least two groups of EEG acquisition modules, wherein the EEG receiving module establishes a transmission channel with each group of EEG acquisition modules; wherein...
[0008] Each EEG acquisition module group includes no fewer than 3 EEG acquisition modules. Each EEG acquisition module includes a graphene flexible electrode, an electrode fixing structure, and an EEG processing module. The graphene flexible electrode is attached to the bottom surface of the electrode fixing structure and is electrically connected to the electrode fixing structure. The EEG processing module is installed inside the electrode fixing structure and is electrically connected to the electrode fixing structure. The EEG processing module includes an EEG transmitting star flash MCU.
[0009] Any one of the EEG processing modules in each EEG acquisition module group is the total EEG processing module, and the remaining EEG processing modules are sub-EEG processing modules. The EEG transmitting star flash MCU of each sub-EEG processing module establishes a first transmission channel with the EEG transmitting star flash MCU of the total EEG processing module.
[0010] The EEG receiving module includes an EEG receiving MCU, a central processing unit (CPU), and a display. The CPU is electrically connected to both the EEG receiving MCU and the display. The EEG receiving MCU establishes a second transmission channel with the EEG transmitting MCU of all the main EEG processing modules.
[0011] Furthermore, the graphene flexible electrode includes a polyimide substrate, a graphene coating group, and two metal wire sockets; wherein, the graphene coating group includes a left graphene coating and a right graphene coating that are in close contact in an interdigital form; the polyimide substrate is in close contact with the graphene coating group, and stepped holes are opened at both ends of the polyimide substrate; one end of the two metal wire sockets with contacts extends into the two stepped holes respectively and contacts the left graphene coating and the right graphene coating; the other end of the two metal wire sockets is connected to the electrode fixing structure.
[0012] Furthermore, the graphene flexible electrode has a long and narrow structure, and its width is 5-15 mm.
[0013] Furthermore, the electrode fixing structure includes a fixing box, a flexible top block, Velcro straps, and two male metal wire connectors; wherein, the EEG processing module is installed inside the fixing box; the flexible top block is placed at the bottom of the fixing box and is in direct contact with the polyimide substrate; there are no fewer than two Velcro straps placed on both sides of the fixing box; the two male metal wire connectors are distributed at both ends of the flexible top block and are connected to two female metal wire connectors one by one, and the two male metal wire connectors are electrically connected to the EEG processing module.
[0014] Furthermore, both male metal conductors are conical flexible conductors.
[0015] Furthermore, the electrode fixing structure also includes a star-flash connection indicator light, a buzzer, and a first power supply; wherein, the star-flash connection indicator light and the buzzer are installed on the top surface of the fixing box and are electrically connected to the EEG processing module respectively; the first power supply is installed inside the fixing box and is electrically connected to the power supply terminals of the star-flash connection indicator light and the buzzer.
[0016] Furthermore, adhesive is coated between the polyimide substrate and the flexible top block.
[0017] Furthermore, each EEG processing module also includes an EEG signal preprocessing circuit and a second power supply. The EEG signal preprocessing circuit includes an inverting circuit, a differential amplifier circuit, a bandpass filter circuit, an operational amplifier circuit, and an analog-to-digital converter circuit connected in sequence. One of the two input terminals of the differential amplifier circuit is electrically connected to a male metal wire connector, and the other is electrically connected to the EEG signal output circuit after processing by the inverting circuit. The output terminal of the analog-to-digital converter circuit is electrically connected to the EEG transmitting star flash MCU. The second power supply is electrically connected to the power supply terminals of the inverting circuit, the differential amplifier circuit, the bandpass filter circuit, the operational amplifier circuit, the analog-to-digital converter circuit, and the EEG transmitting star flash MCU.
[0018] Furthermore, in each EEG acquisition module group, the EEG transmitting star flash MCU in the total EEG processing module includes a G-node transceiver unit, and the EEG transmitting star flash MCU in other sub-EEG processing modules includes a T-node transmitting unit. All T-node transmitting units are connected to the G-node transceiver unit through the first transmission channel.
[0019] The EEG receiver MCU includes a G-node main receiver unit. All G-node transceiver units in the main EEG processing module are connected to the G-node main receiver unit through a second transmission channel.
[0020] Compared with the prior art, the present invention can achieve the following beneficial effects:
[0021] (1) In the EEG synchronous acquisition system described in this utility model, a two-level communication network is formed by using star flash short-range wireless communication technology to realize efficient overall control and user interaction of the entire EEG synchronous acquisition system, and finally realize the simultaneous observation of the real-time EEG signals of multiple patients on the display.
[0022] (2) In the EEG synchronous acquisition system described in this utility model, a graphene coating group composed of a left graphene coating and a right graphene coating in close contact in the form of interdigital fingers is used as a conductive electrode, which realizes the output of dual-channel EEG signals, effectively improves the transmission quality of EEG signals, and can be directly attached to the skin without the use of conductive paste, which greatly simplifies the structure of the patch electrode, reduces signal attenuation, and improves the signal-to-noise ratio of EEG signals.
[0023] (3) In the EEG synchronous acquisition system described in this utility model, an inverting circuit and a differential amplifier circuit are used in the EEG signal preprocessing circuit to effectively suppress common-mode noise of the dual-channel EEG signals acquired by the graphene coating group. Then, the interference signal is filtered out by a bandpass filter and the signal is processed by an operational amplifier circuit, so that the signal received by the EEG receiving module is more in line with the common wave value range when doctors make diagnoses, which helps doctors to accurately provide treatment plans based on the EEG situation. Attached Figure Description
[0024] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:
[0025] Figure 1 This is a schematic diagram of the overall EEG synchronous acquisition system described in this embodiment of the present invention;
[0026] Figure 2 This is a schematic diagram of the external structure of the EEG acquisition module described in an embodiment of the present utility model;
[0027] Figure 3 This is a schematic diagram of the structure of the graphene flexible electrode described in an embodiment of the present invention;
[0028] Figure 4 This is a schematic diagram of the electrode fixing structure described in an embodiment of the present invention;
[0029] Figure 5 This is a schematic diagram of the top structure of the electrode fixing structure described in an embodiment of the present invention;
[0030] Figure 6 This is a schematic diagram illustrating the communication process between the EEG acquisition module and the EEG receiving module as described in an embodiment of this utility model.
[0031] Explanation of reference numerals in the attached figures:
[0032] 100. EEG acquisition module; 110. Graphene flexible electrode; 111. Graphene coating assembly; 111-1. Left graphene coating; 111-2. Right graphene coating; 112. Polyimide substrate; 113. Metal wire female connector; 114. Anti-adhesive film; 120. Electrode fixing structure; 121. Fixing box; 122. Flexible top block; 123. Velcro; 124. Metal wire male connector; 125. Star flashing connection indicator light; 126. Buzzer; 130. Brain Electroencephalogram (EEG) processing module; 131, EEG signal preprocessing circuit; 131-1, inverting circuit; 131-2, differential amplifier circuit; 131-3, bandpass filter circuit; 131-4, operational amplifier circuit; 131-5, analog-to-digital converter circuit; 132, second power supply; 133, EEG transmitting MCU; 200, EEG receiving module; 201, EEG receiving MCU; 202, central processing unit; 203, display; 300, patient's scalp. Detailed Implementation
[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and do not constitute a limitation thereof.
[0034] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0035] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0037] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0038] like Figures 1 to 6 As shown in the embodiment of this utility model, the synchronous EEG acquisition system includes at least two sets of EEG acquisition modules and an EEG receiving module 200. Each set of EEG acquisition modules is fixed on the patient's scalp 300 and is used to acquire the brain biosignals of a single patient and convert the brain biosignals into brain voltage signals (hereinafter referred to as EEG signals for ease of description). Multiple sets of EEG acquisition modules can simultaneously acquire the brain biosignals and corresponding EEG signals of at least two patients. A transmission channel is established between the EEG receiving module 200 and the multiple sets of EEG acquisition modules to realize the simultaneous reception, processing, and display of EEG signals from multiple patients.
[0039] Each EEG acquisition module group includes no fewer than three EEG acquisition modules 100, enabling simultaneous acquisition of EEG information from different locations on the cerebral cortex of the same patient. Each EEG acquisition module 100 includes a graphene flexible electrode 110, an electrode fixing structure 120, and an EEG processing module 130. The graphene flexible electrode 110 is attached to the bottom surface of the electrode fixing structure 120 and electrically connected to it. The EEG processing module 130 is installed inside the electrode fixing structure 120 and electrically connected to it.
[0040] The graphene flexible electrode 110 includes a graphene coating group 111, a polyimide substrate 112, and two metal wire sockets 113. The polyimide substrate 112 has a solid adhesive coating at the end without the graphene coating. The graphene coating group 111 features high sensitivity, rapid response, and high resolution, directly contacting the patient's scalp 300 to convert brain biosignals into EEG signals. The graphene coating group 111 includes a left graphene coating 111-1 and a right graphene coating 111-2, which are in close contact in an interdigital configuration, enabling dual-path output of EEG signals from the same detection area and further improving the transmission speed of EEG signals. The polyimide substrate 112 is in close contact with the graphene coating group 111, and stepped holes are formed at both ends of the polyimide substrate 112. One end of the two metal wire female seats 113 with contacts extends into the stepped holes and contacts the left graphene coating 111-1 and the right graphene coating 111-2 respectively. The other end of the two metal wire female seats 113 is connected to the electrode fixing structure 120.
[0041] In this embodiment of the invention, to allow the graphene flexible electrode 110 to conform to the gaps in a normal human hair, a long and narrow structure is preferably adopted, with a width of 5-15 mm. Simultaneously, when the graphene flexible electrode 110 is not in use, anti-adhesion films 114 are affixed to both the graphene coating group 111 side and the polyimide substrate 112 side. This serves two purposes: firstly, to prevent the graphene flexible electrode 110 from being exposed to air for extended periods, thus reducing signal transmission efficiency; and secondly, to protect the solid adhesive used for bonding and fixing at the bottom of the polyimide substrate 112. The anti-adhesion films 114 on both sides are removed when the graphene flexible electrode 110 is used.
[0042] The electrode fixation structure 120 includes a fixation box 121, a flexible top block 122, Velcro straps 123, two male metal wire connectors 124, a star-shaped connection indicator light 125, and a buzzer 126. The EEG processing module 130 is installed inside the fixation box 121. The flexible top block 122 is located at the bottom of the fixation box 121 and is in direct contact with the polyimide substrate 112, used to assist in fixing the graphene flexible electrode 110. At least two Velcro straps 123 are placed on both sides of the fixation box 121, fixing the electrode fixation structure 120 together with the graphene flexible electrode 110 to the patient's scalp 300, allowing the graphene coating assembly 111 to better conform to the patient's scalp 300. Two male metal wires 124 are distributed at both ends of the flexible top block 122 and are connected to two female metal wires 113 in a one-to-one correspondence. The two male metal wires 124 are electrically connected to the EEG processing module 130, so that the two male metal wires 124 and the two female metal wires 113 cooperate to transmit the EEG signals collected by the graphene coating group 111 to the EEG processing module 130.
[0043] A star-shaped connection indicator light 125 and a buzzer 126 are mounted on the top surface of the mounting box 121. The star-shaped connection indicator light 125 is electrically connected to the EEG processing module 130 and is used to display the operating status of the EEG processing module 130; the buzzer 126 is electrically connected to the EEG processing module 130 and is used to indicate whether the graphene flexible electrode 110 has detached or whether there is an abnormal EEG signal. A primary power supply for powering the star-shaped connection indicator light 125 and the buzzer 126 is installed inside the mounting box 121 and is electrically connected to the power supply terminals of the star-shaped connection indicator light 125 and the buzzer 126.
[0044] In this embodiment of the invention, the connection between the two male metal wire connectors 124 and the female metal wire connector 113 not only enables signal transmission but also connects and fixes the graphene flexible electrode 110 and the electrode fixing structure 120. Therefore, both male metal wire connectors 124 are preferably made of conical elastic wires, which ensure stable signal transmission and a tight fit between the graphene flexible electrode 110 and the electrode fixing structure 120 when connected to the female metal wire connector 113. Furthermore, to ensure the overall stability of the graphene flexible electrode 110, in this embodiment of the invention, it is fixed by bonding the polyimide substrate 112 with a solid adhesive and the flexible top block 122. This method also facilitates installation and adjustment.
[0045] The EEG processing module 130 includes an EEG signal preprocessing circuit 131, a second power supply 132, and an EEG transmitting MCU 133 (MCU, Microcontroller Unit). The EEG signal preprocessing circuit 131 is electrically connected to two male metal wires 124 for receiving EEG signals acquired from the graphene coating group 111 and performing noise reduction and signal conversion on the received EEG signals.
[0046] The EEG signal preprocessing circuit 131 includes an inverting circuit 131-1 based on an OPA237 operational amplifier, a differential amplifier circuit 131-2 based on an AD8237 operational amplifier, a bandpass filter circuit 131-3 based on an OPA602 operational amplifier, an operational amplifier circuit 131-4 based on an AD8232 operational amplifier, and an analog-to-digital converter circuit 131-5 based on an ADS1299 digital-to-analog converter.
[0047] In this embodiment of the invention, since the two EEG signals output from the same region are identical, the inverting circuit 131-1 inverts one of the signals and inputs it to the inverting input of the differential amplifier circuit 131-2. The other signal is input to the non-inverting input of the differential amplifier circuit 131-2. The differential amplifier circuit 131-2 performs differential processing on the input signals to suppress common-mode noise. The output EEG signal of the differential amplifier circuit 131-2 is filtered by the bandpass filter circuit 131-3 to obtain a useful EEG signal. Then, the filtered EEG signal is amplified by the operational amplifier circuit 131-4, so that the output signal of the operational amplifier circuit 131-4 reaches a potential that can be processed by the analog-to-digital converter circuit 131-5.
[0048] The EEG signal processed by the analog-to-digital converter circuit 131-5 is transmitted to the EEG transmitting star flash MCU 133. In this embodiment of the invention, the EEG transmitting star flash MCU 133 uses the Hi3873V100 chip.
[0049] Simultaneously, the second power supply 132 is electrically connected to the power supply terminals of the inverting circuit 131-1, the differential amplifier circuit 131-2, the bandpass filter circuit 131-3, the operational amplifier circuit 131-4, the analog-to-digital converter circuit 131-5, and the EEG transmitting star-flash MCU 133, providing power to maintain the operation of the EEG processing module 130. In this embodiment of the invention, the first power supply and the second power supply 132 are integrated into a single power supply.
[0050] The EEG transmitting MCU133 is electrically connected to the EEG acquisition module's star-flash connection indicator 125 and buzzer 126. The star-flash connection indicator 125 displays the current operating status of the EEG transmitting MCU133: when the star-flash connection indicator 125 is lit, it indicates that the EEG transmitting MCU133 is turned on or in transmission mode; when the star-flash connection indicator 125 flashes rapidly, it indicates that the EEG transmitting MCU133 is preparing for communication; when the star-flash connection indicator 125 is off, it indicates that the EEG transmitting MCU133 has stopped operating or cannot operate normally. The buzzer 126 communicates with the EEG receiving module 200 through the EEG transmitting MCU133. The EEG receiving module 200 sends a sound signal to the buzzer 126 based on the received and processed EEG signal, thereby controlling the buzzer 126 to sound.
[0051] For each group of EEG acquisition modules, one EEG processing module 130 is arbitrarily selected as the main EEG processing module, and the remaining EEG processing modules 130 are sub-EEG processing modules. The EEG transmitting star flash MCU 133 in the main EEG processing module includes a G-node transceiver unit, and the EEG transmitting star flash MCU 133 in the other sub-EEG processing modules all include a T-node transmitting unit. All T-node transmitting units are connected to the G-node transceiver unit through the first transmission channel, thus forming a primary communication network.
[0052] Within the same EEG acquisition module group, the distribution of the total EEG processing module and the sub-EEG processing modules on the patient's scalp 300° conforms to the internationally accepted "10-20 system". In actual use, the total EEG processing module and the sub-EEG processing modules can be adjusted according to the patient's condition.
[0053] The EEG receiving module 200 includes an EEG receiving MCU 201, a central processing unit (CPU) 202, and a display 203. The CPU 202 is electrically connected to both the EEG receiving MCU 201 and the display 203. The EEG receiving MCU 201 receives all data from the EEG transmitting MCU 133 and transmits the received data to the CPU 202. The processed EEG signals from the CPU 202 are displayed on the display 203. In this embodiment, the EEG receiving MCU 201 uses a Hi3873V100 chip that is compatible with the EEG transmitting MCU 133.
[0054] The EEG receiver MCU201 includes a G-node main receiver unit. All G-node transceiver units in the EEG acquisition module groups are connected to the main receiver unit via a second transmission channel. This allows the EEG information acquired by all the EEG acquisition module groups to be transmitted and aggregated into the EEG receiver MCU201, thus obtaining multi-electrode EEG signals from different patients, forming a two-level communication network. The structure of the two-level communication network is as follows: Figure 6 As shown.
[0055] The central processing unit 202 is equipped with EEG acquisition control software. The EEG acquisition control software performs signal processing operations such as demodulation on the EEG information received by the EEG receiving star flash MCU 201, and restores the multi-person EEG information from the EEG receiving star flash MCU 201 into multiple single-person EEG information. The multiple single-person EEG information is then displayed on the display 203 in the form of channels. That is, each patient has a corresponding total signal acquisition channel, and each total signal acquisition channel is divided into multiple sub-signal acquisition channels. The number of sub-signal acquisition channels is consistent with the number of EEG acquisition modules in each group of EEG acquisition modules. The central processing unit 202 controls the buzzer 126 through the EEG receiving star flash MCU 201 and the EEG transmitting star flash MCU 133. When an EEG acquisition module 100 is detached or an abnormality is detected, the central processing unit 202 controls the buzzer 126 on the corresponding EEG acquisition module 100 to sound an alarm, which is displayed on the display 203. This can remind medical staff to check the patient's condition and can also process the electrodes in a timely manner to avoid incompleteness in the acquisition of EEG signals.
[0056] The display 203 shows an electrode connection display area and a sub-signal acquisition channel display area. The electrode connection display area is used to display all the EEG acquisition modules 100 fixed to the brain of the patient being observed. Each EEG acquisition module 100 has its corresponding label (i.e. Figure 6 (The text mentions markers like F7, T3, and T6 on the patient's scalp 300, but this seems unrelated to the main topic and is likely a separate sentence fragment.) When the markers on the EEG acquisition module 100 change from gray to bright, it indicates that the EEG acquisition module 100 has successfully connected to the EEG receiving module 200. The sub-signal acquisition channel display area displays the EEG waveforms acquired by each EEG acquisition module of the currently observed patient in channel form.
[0057] To clearly describe the communication and transmission relationship between the EEG acquisition module 100 and the EEG receiving module 200 in this embodiment of the invention, an example is taken with three groups of EEG acquisition modules, each group comprising 21 EEG acquisition modules 100 (e.g., ...). Figure 6 As shown in the diagram, a radio channel is established between the EEG receiving module 200 and the three groups of EEG acquisition modules, enabling simultaneous reception, processing, and display of EEG signals from three patients. Each group of EEG acquisition modules has 21 EEG acquisition modules 100 evenly distributed on the scalp 300 of a patient's brain. The EEG processing module 130 of one of the EEG acquisition modules 100 is selected as the main EEG processing module, and the EEG processing modules 130 of the remaining 20 EEG acquisition modules 100 are designated as sub-EEG processing modules.
[0058] At this point, in each EEG acquisition module group, the T-node transmitting units of the 20 sub-EEG processing modules establish communication connections with the G-node transceiver units in the total EEG processing module, and aggregate the EEG information collected by the EEG acquisition module 100 where the 20 sub-EEG processing modules are located into the EEG acquisition module 100 where the total EEG processing module is located, thus completing the construction of the first-level communication network.
[0059] The total EEG processing module in the three EEG acquisition module groups establishes a communication connection with the total G-node receiving unit in the EEG receiving star flash MCU201 through its respective G-node transceiver unit, and gathers the EEG information collected by the EEG acquisition module 100 where the three total EEG processing modules are located into the EEG receiving star flash MCU201, thus completing the construction of the secondary communication network.
[0060] The usage process of the EEG synchronous acquisition system described in this embodiment of the invention specifically includes the following:
[0061] S1: Multiple sets of EEG acquisition modules are installed on the heads of multiple patients. For one patient, one side of the graphene coating group 111 on the graphene flexible electrode 110 is directly attached to the patient's scalp 300 along the gap in the patient's hair, and then Velcro 123 is used to stick and fix it.
[0062] S2: Turn on the EEG receiver module 200, the first power supply and the second power supply 132. At this time, the star flash connection indicator 125 will light up.
[0063] S3: Select the flag of the total signal acquisition channel corresponding to the patient to be observed. At this time, the star flashing connection indicator light 125 on the patient's head corresponding to the total signal acquisition channel will flash rapidly to prepare for communication.
[0064] S4: When all the markers in the electrode connection display area on the display 203 change from gray to bright, it indicates that all EEG acquisition modules 100 and EEG receiving modules 200 of the patient to be observed have been successfully connected. At this time, the star flashing connection indicator 125 on the patient's head corresponding to the total signal acquisition channel returns to the lit state.
[0065] S5: All EEG acquisition modules simultaneously acquire EEG information from multiple patients and transmit it to the EEG receiving module 200.
[0066] S6: The EEG acquisition control software in the central processing unit 202 receives the EEG information received by the Star Flash MCU 201, performs signal processing operations such as demodulation, and displays the EEG waveform in the form of channels in the sub-signal acquisition channel display area of the display 203, thereby completing the selection, display and viewing of EEG signals from different channels (patients).
[0067] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.
Claims
1. A synchronous EEG acquisition system, characterized in that: It includes an EEG receiving module and at least two groups of EEG acquisition modules, wherein the EEG receiving module group and each group of EEG acquisition modules establish a transmission channel; wherein, Each EEG acquisition module group includes no fewer than three EEG acquisition modules. Each EEG acquisition module includes a graphene flexible electrode, an electrode fixing structure, and an EEG processing module. The graphene flexible electrode is attached to the bottom surface of the electrode fixing structure and is electrically connected to the electrode fixing structure. The EEG processing module is installed inside the electrode fixing structure and is electrically connected to the electrode fixing structure. The EEG processing module includes an EEG transmitting MCU. The graphene flexible electrode includes a polyimide substrate, a graphene coating assembly, and two metal wire female connectors. The graphene coating assembly comprises a left and a right graphene coating in close interdigital contact. The polyimide substrate is in close contact with the graphene coating assembly and has stepped holes at both ends. One end of each metal wire female connector with a contact point extends into the stepped holes and contacts the left and right graphene coatings, respectively. The other ends of the two metal wire female connectors are connected to the electrode fixing structure. The electrode fixing structure includes a fixing box, a flexible top block, Velcro fasteners, and two metal wire male connectors. The EEG processing module is installed inside the fixing box. The flexible top block is placed at the bottom of the fixing box and is in direct contact with the polyimide substrate. There are at least two Velcro fasteners placed on both sides of the fixing box. The two metal wire male connectors are distributed at both ends of the flexible top block and are connected to the two metal wire female connectors one-to-one, and are electrically connected to the EEG processing module. One EEG processing module in each EEG acquisition module group is the main EEG processing module, and the remaining EEG processing modules are sub-EEG processing modules. The EEG transmitting star flash MCU of each sub-EEG processing module establishes a first transmission channel with the EEG transmitting star flash MCU of the main EEG processing module. The EEG receiving module includes an EEG receiving MCU, a central processing unit (CPU), and a display. The CPU is electrically connected to the EEG receiving MCU and the display, respectively. The EEG receiving MCU establishes a second transmission channel with the EEG transmitting MCU of all the main EEG processing modules.
2. The EEG synchronous acquisition system according to claim 1, characterized in that: The graphene flexible electrode has a long and narrow structure, and the width of the graphene flexible electrode is 5-15 mm.
3. The EEG synchronous acquisition system according to claim 1, characterized in that: Both male metal wires have conical, flexible leads.
4. The EEG synchronous acquisition system according to claim 1, characterized in that: The electrode fixing structure also includes a star-flash connection indicator, a buzzer, and a first power supply; wherein, the star-flash connection indicator and the buzzer are installed on the top surface of the fixing box and are electrically connected to the EEG processing module respectively, and the first power supply is installed inside the fixing box and is electrically connected to the power supply terminals of the star-flash connection indicator and the buzzer.
5. The EEG synchronous acquisition system according to claim 1, characterized in that: Adhesive is applied between the polyimide substrate and the flexible top block.
6. The EEG synchronous acquisition system according to claim 1, characterized in that: Each EEG processing module further includes an EEG signal preprocessing circuit and a second power supply. The EEG signal preprocessing circuit includes an inverting circuit, a differential amplifier circuit, a bandpass filter circuit, an operational amplifier circuit, and an analog-to-digital converter circuit connected in sequence. One of the two input terminals of the differential amplifier circuit is electrically connected to a male metal wire connector, and the other is electrically connected to the EEG signal output circuit after processing by the inverting circuit. The output terminal of the analog-to-digital converter circuit is electrically connected to the EEG transmitting star flash MCU. The second power supply is electrically connected to the power supply terminals of the inverting circuit, the differential amplifier circuit, the bandpass filter circuit, the operational amplifier circuit, the analog-to-digital converter circuit, and the EEG transmitting star flash MCU.
7. The EEG synchronous acquisition system according to claim 1, characterized in that: In each group of EEG acquisition modules, the EEG transmitting star flash MCU in the total EEG processing module includes a G-node transceiver unit, and the EEG transmitting star flash MCU in other sub-EEG processing modules includes a T-node transmitting unit. All T-node transmitting units are communicatively connected to the G-node transceiver unit through the first transmission channel. The EEG receiving star flash MCU includes a G-node total receiving unit, and all G-node transceiver units in the total EEG processing module are communicatively connected to the G-node total receiving unit through the second transmission channel.