Portable sleep signal acquisition device based on multichannel electroencephalogram

Abstract

The utility model discloses a portable sleep signal acquisition device based on multichannel electroencephalogram, and belongs to the technical field of sleep signal acquisition. The device comprises a host and an electrode plate, the electrode plate adopts flexible metal electrodes arranged on an FPC (Flexible Printed Circuit) board, and the flexible metal electrodes comprise channel electrodes FP1, FPz, FP2, AF7, AF3, AFz, AF4 and AF8. The host comprises a filtering module, a signal acquisition module, a microcontroller module, a wireless transmission module and a power supply module. The device collects signals of eight channels, and provides more comprehensive bio-electricity signals for follow-up sleep monitoring of an upper computer. The flexible metal electrode structurally comprises the substrate layer, the conductive coating and the protective layer in sequence from bottom to top, is easy to wear and light in weight, and reduces the influence of equipment on a user; a user can independently complete wearing of the equipment without assistance of additional medical staff. According to the utility model, the development of sleep medicine can be greatly promoted, more potential sleep disorder patients can be diagnosed and treated as soon as possible, and the health level of Chinese citizens is improved.

Description

Technical Field

[0001] The utility model relates to a portable sleep signal acquisition device based on multi-channel electroencephalogram, which belongs to the field of intelligent sleep technology. Background Technique

[0002] Sleep quality monitoring and evaluation are the basis for the diagnosis and treatment of sleep-related diseases. Therefore, it is crucial to develop a reliable device that integrates sleep quality monitoring and evaluation.

[0003] As an important tool for the diagnosis of sleep diseases in clinical practice, polysomnography (PSG) can provide detailed disease diagnosis information for doctors. However, standard PSG monitoring has its inherent disadvantages: (1) The operation is complex and requires professional technicians. Moreover, the analysis of each PSG record needs to be manually completed by a sleep technician. For a PSG record that is 7-9 hours long, it takes at least 2 hours for a skilled sleep technician. This method is time-consuming and laborious; (2) It needs to be carried out in a special sleep center. In China, the number of existing standardized sleep centers and qualified sleep technicians is small, which does not match the number of patients with sleep disorders, resulting in a low diagnosis rate and treatment rate for patients; (3) The monitoring cost is expensive, making many potential sleep disorder patients unable to seek medical treatment in time and exacerbating the severity of the condition; (4) The subjective experience of patients is poor. Because a relatively large number of leads need to be connected from head to toe, the subjective sleep feeling of the subjects is poor, which affects the accuracy of the monitoring results, thus causing deviations in the results of doctor diagnosis or sleep-related research.

[0004] Although the existing portable sleep signal acquisition devices on the market can greatly meet the portable requirements, they are mainly for commercial purposes and have the following limitations: (1) They do not touch or only collect the main electrophysiological signal (electroencephalogram) that determines the changes in sleep structure of a single lead, resulting in one-sided and inaccurate sleep quality detection; (2) Most of the existing portable electroencephalogram acquisition electrodes use dry electrodes mainly composed of graphene, which are hard and cannot meet the long-term acquisition during sleep. In addition, the patch-type hydrogel electrodes cannot be reused, and the signal quality decreases as the monitoring time increases. Based on this, developing new technologies for sleep electroencephalogram acquisition electrodes and reliable portable sleep signal acquisition devices can not only effectively solve the above problems but also promote the rapid development of sleep medicine. Content of the Utility Model

[0005] In view of the existing problems, the utility model develops a portable sleep signal acquisition device based on multi-channel electroencephalogram, which realizes long-term acquisition of sleep quality with high portability and comfort on the premise of ensuring accurate acquisition of sleep signals.

[0006] The technical solution adopted by the present utility model is as follows: A portable sleep signal acquisition device based on multi-channel electroencephalogram. The device includes a main unit and electrode patches. The electrode patches adopt flexible metal electrodes arranged on an FPC board. The flexible metal electrodes include FP1 channel electrodes, FPz channel electrodes, FP2 channel electrodes, AF7 channel electrodes, AF3 channel electrodes, AFz channel electrodes, AF4 channel electrodes, and AF8 channel electrodes;

[0007] The main unit includes a filtering module, a signal acquisition module, a microcontroller module, a wireless transmission module, and a power supply module;

[0008] The filtering module is used to receive the signals collected by the electrodes and filter the signals;

[0009] The signal acquisition module includes a gain amplifier and an analog-to-digital converter, and is used to capture bioelectric signals and increase the amplitude of the signals;

[0010] The microcontroller module establishes communication with the signal acquisition module and the wireless transmission module. The microcontroller module is used to receive the signals of the signal acquisition module and store them, and then transmit the signals to the wireless transmission module;

[0011] The wireless transmission module is used to receive the signals of the microcontroller module and wirelessly transmit them to the upper computer.

[0012] The structure of the flexible metal electrode is successively a base layer, a conductive coating, and a protective layer from bottom to top.

[0013] The power supply module includes a charging circuit and a voltage stabilizing circuit. The charging circuit completes the charging management of the lithium battery through a power supply chip; the voltage stabilizing circuit uses a voltage regulator to stabilize the voltage.

[0014] The power supply chip adopts the TP4057 model, and the voltage regulator is an HT7533 linear voltage regulator.

[0015] The microcontroller module uses STM32L051K8U6 as the main control chip.

[0016] The wireless transmission module adopts the Bluetooth module FSC-BT630.

[0017] A reference source and a clock module are also provided in the signal acquisition device.

[0018] The beneficial effects of the present utility model are as follows: (1) Compared with the standard PSG device, the electrodes for signal acquisition in this application include: Fp1, Fpz, Fp2, AF7, AF3, AFZ, AF4, AF8 channel electrodes, which have almost no impact on the user's whole-night sleep and can accurately collect sleep signals.

[0019] (2) Compared with the expensive and inconvenient sleep monitoring systems used in existing hospitals, the circuit design of this system has a lower cost and is convenient to use.

[0020] (3) To avoid the hard material of the existing Jinbei electrodes affecting the user's sleep, this application independently develops flexible metal electrodes and integrates them with a flexible printed circuit (FPC) to form a headband electroencephalogram acquisition device. This utility model is simple to wear and has a light weight, reducing the impact of the device on the monitored person.

[0021] Compared with the standard PSG monitoring, the device in this application can greatly reduce the negative impact of the device on the monitored person. The user can independently complete the wearing of the device without the assistance of additional medical staff. This utility model can greatly promote the development of sleep medicine, enabling more potential sleep disorder patients to be diagnosed and treated as early as possible and improving the health level of the people in our country. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of a portable sleep signal acquisition device based on multi-channel electroencephalogram.

[0023] Figure 2 It is a schematic structural diagram of the flexible metal electrode.

[0024] Figure 3 It is a schematic structural diagram of the host.

[0025] In the figure: 1. FPC board, 2. FPC board adhesive layer, 3. Flexible metal electrode, 3a. Protective layer, 3b. Conductive coating, 3c. Base layer, 31. FP1 channel electrode, 32. FPz channel electrode, 33. FP2 channel electrode, 34. AF7 channel electrode, 35. AF3 channel electrode, 36. AFz channel electrode, 37. AF4 channel electrode, 38. AF8 channel electrode, 4. Host, 41. Filter module, 42. Signal acquisition module, 43. Microcontroller module, 44. Wireless transmission module, 45. Power supply module, 46. Reference source and clock module, 421. Gain amplifier, 422. Digital-to-analog converter, 451. Power supply chip, 452. Lithium battery, 453. Voltage regulator, 5. Host adhesive layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings of the present utility model.

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0028] Figure 1 A portable sleep signal acquisition device based on multi-channel electroencephalogram is shown, which includes a main unit 4 and electrode patches. The electrode patches use flexible metal electrodes 3 provided on an FPC board 1. The flexible metal electrodes 3 include an FP1 channel electrode 31, an FPz channel electrode 32, an FP2 channel electrode 33, an AF7 channel electrode 34, an AF3 channel electrode 35, an AFz channel electrode 36, an AF4 channel electrode 37, and an AF8 channel electrode. The electroencephalogram acquisition electrodes use the self-developed flexible metal electrodes 3. The flexible metal electrodes 3 are integrated on the FPC board 1 and include a base layer 3c, a conductive coating 3b, and a protective layer 3a. The base layer 3c uses a flexible insulating material, such as polyester film or polyimide film; the conductive coating 3b uses gold foil to make circular electrode areas and wires connected to the main unit. The area of the circular electrode areas is 100 mm 2 , and the wire length is 40 - 100 mm 2 , the width is 1 mm, and the thickness is 0.07 mm. The protective layer 3a is made of polyester resin material to protect the electrodes and wires from damage. Different from the electrode placement positions of traditional sleep monitoring devices, the electrode placement positions of this signal acquisition device are concentrated on the forehead to reduce the impact of the device on the user's sleep.

[0029] Figure 2 The structure of the flexible metal electrode is shown. The structure of the flexible metal electrode 3 from bottom to top is successively a base layer 3c, a conductive coating 3b, and a protective layer 3a.

[0030] Figure 3The structure of the host is shown. The host 4 includes a filtering module 41, a signal acquisition module 42, a microcontroller module 43, a wireless transmission module 44, a power supply module 45, and a reference source and clock module 46. The filtering module 41 is used to receive the signals collected by the electrodes and filter the signals. The signal acquisition module 42 includes a gain amplifier 421 and an analog-to-digital converter 422, and is used to capture bioelectric signals and increase the amplitude of the signals; the microcontroller module 43 establishes communication with the signal acquisition module 42 and the wireless transmission module 44. The microcontroller module 43 uses STM32L051K8U6 as the main control chip, and is used to receive the signals of the signal acquisition module 42 and store them, and then transmit the signals to the wireless transmission module 44; the wireless transmission module 44 uses a Bluetooth module FSC-BT630, and is used to receive the signals of the microcontroller module 43 and wirelessly transmit them to the upper computer. The power supply module 45 includes a charging circuit and a voltage stabilizing circuit. The charging circuit completes the charging management of the lithium battery 452 through the power supply chip 451; the voltage stabilizing circuit uses a voltage regulator 453 to stabilize the voltage. The power supply chip 451 uses the TP4057 model, and the voltage regulator 453 is an HT7533 linear voltage regulator.

[0031] The signal acquisition module 42 performs 8-channel low-noise sampling through the ADS1299 analog front end. Each channel of the ADS1299 module has a 24-bit synchronous sampling ΔΣ analog-to-digital converter. Its high resolution and low noise characteristics enable it to accurately capture weak bioelectric signals; at the same time, the chip is built-in with a programmable gain amplifier (PGA), thereby increasing the amplitude of the signals. This signal acquisition device is built-in with a reference source and a clock signal, reducing the dependence on external analog devices. This not only simplifies the circuit design, but also reduces the number of components in the circuit, reducing the power consumption and material cost of the system.

[0032] The power supply module 45 includes a charging circuit and a voltage stabilizing circuit: the charging circuit completes the charging management of the lithium battery through the power supply chip TP4057; the voltage stabilizing circuit uses an HT7533 linear voltage regulator to stabilize the voltage to 3.3V to supply power to the STM32L051K8U6 main control chip and other modules.

[0033] The filtering module 41 uses an active second-order band-pass filter to filter the collected electroencephalogram signals in the range of 0.3 - 35 Hz, which can amplify weak EEG signals and effectively filter out noise and interference.

[0034] The microcontroller module uses STM32L051K8U6 as the main control chip. This chip is an ultra-low-power controller integrating a 32-bit processor core with a working frequency of 32 MHz, and has two SPI interfaces to establish communication with the ADS1299 module.

[0035] The wireless transmission uses an ultra-low-power Bluetooth module FSC-BT630, which supports interfaces such as UART, I2C, and SPI, and has the advantages of ultra-small size and high-speed transmission.

[0036] This signal acquisition device only transmits the acquired signals to the upper computer through the wireless transmission module, and the trained model in the upper computer evaluates the sleep-related parameters of the acquired signals, such as total sleep time, sleep efficiency, sleep latency, percentage of deep sleep, percentage of REM sleep, etc.; the display of this part is written by the upper computer software using LabVIEW.

[0037] A portable sleep signal acquisition device based on multi-channel electroencephalogram includes a main unit 4. A main unit adhesive layer 5 is provided on the upper surface of the main unit body. The FPC board 1 extends from above the main unit 4, and the flexible metal electrode 3 is attached to the lower surface of the FPC board 1. In addition, an adhesive layer of the same size as the upper surface of the main unit 4 is installed on the upper surface of the FPC board 1.

[0038] When working with the above technical solution, the lower surface of the FPC board 1 is pasted on the forehead area through the FPC board adhesive layer 2, and then the main unit 4 is turned up so that its upper surface is pasted on the upper surface of the FPC board 1, so as to achieve the purpose of fixing the monitoring device and convenient wearing. Turning on the main unit switch can start the acquisition of sleep signals.

Claims

1. A portable sleep signal acquisition device based on multi-channel electroencephalogram, characterized in that: The device includes a main unit (4) and electrode plates. The electrode plates are formed by disposing flexible metal electrodes (3) on an FPC board (1). The flexible metal electrodes (3) include an FP1 channel electrode (31), an FPz channel electrode (32), an FP2 channel electrode (33), an AF7 channel electrode (34), an AF3 channel electrode (35), an AFz channel electrode (36), an AF4 channel electrode (37), and an AF8 channel electrode (38). The main unit (4) includes a filtering module (41), a signal acquisition module (42), a microcontroller module (43), a wireless transmission module (44), and a power supply module (45). The filtering module (41) is configured to receive the signals collected by the electrodes and filter the signals. The signal acquisition module (42) includes a gain amplifier (421) and an analog-to-digital converter (422), and is configured to capture bioelectric signals and increase the amplitude of the signals. The microcontroller module (43) establishes communication with the signal acquisition module (42) and the wireless transmission module (44). The microcontroller module (43) is configured to receive the signals from the signal acquisition module (42), store them, and then transmit the signals to the wireless transmission module (44). The wireless transmission module (44) is configured to receive the signals from the microcontroller module (43) and wirelessly transmit them to a host computer.

2. The portable sleep signal acquisition device based on multi-channel electroencephalogram according to claim 1, wherein: The structure of the flexible metal electrode (3) from bottom to top is successively a base layer (3c), a conductive coating (3b), and a protective layer (3a).

3. The portable sleep signal acquisition device based on multi-channel electroencephalogram according to claim 1, characterized in that: The power supply module (45) includes a charging circuit and a voltage stabilizing circuit. The charging circuit completes the charging management of a lithium battery (452) through a power supply chip (451); the voltage stabilizing circuit uses a voltage regulator (453) for voltage stabilization.

4. A portable sleep signal acquisition device based on multi-channel electroencephalogram according to claim 3, characterized in that: The power supply chip (451) uses the model TP4057, and the voltage regulator (453) is an HT7533 linear voltage regulator.

5. A portable sleep signal acquisition device based on multi-channel electroencephalogram according to claim 1, characterized in that: The microcontroller module (43) uses an STM32L051K8U6 as the main control chip.

6. The portable sleep signal acquisition device based on multi-channel electroencephalogram according to claim 1, characterized in that: The wireless transmission module (44) uses a Bluetooth module FSC-BT630.

7. A portable sleep signal acquisition device based on multi-channel electroencephalogram according to claim 1, characterized in that: A reference source and a clock module (46) are also provided in the signal acquisition device.

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