Synchronous acquisition device for electroencephalogram, heart rate and blood oxygen

Abstract

The utility model discloses a synchronous acquisition device for electroencephalogram, heart rate and blood oxygen. The synchronous acquisition device consists of a wearable piece, a host, a heart rate and blood oxygen acquisition sensor and an electroencephalogram acquisition sensor, the host is fixed on the wearing piece in a penetrating manner; the heart rate and blood oxygen acquisition sensor and the electroencephalogram acquisition sensor are fixed on the inner side surface, attached to the human body, of the wearing piece. By means of the electroencephalogram, heart rate and blood oxygen integrated collecting device, synchronous collection and analysis of various physiological signals are achieved, the time for collecting different physiological parameters through different devices can be shortened, and therefore diagnosis efficiency is improved; on the basis, signal processing circuits which are mutually isolated and have different structures are designed according to different characteristics of the heart rate, the blood oxygen and the electroencephalogram signals, interference between the electroencephalogram signals and the heart rate and blood oxygen signals is effectively prevented, the accuracy and reliability of data are improved, and finally the measurement precision of physiological data is improved.

Description

Technical Field

[0001] This utility model relates to the field of medical testing equipment technology, specifically to a device for synchronously acquiring electroencephalogram (EEG), heart rate, and blood oxygen saturation. Background Technology

[0002] In the field of biomedical monitoring, real-time monitoring of an individual's electroencephalogram (EEG) activity, heart rate, and blood oxygen saturation is crucial for assessing health status, diagnosing diseases, and monitoring treatment effectiveness. Traditional acquisition methods often employ multiple independent devices to measure these three physiological parameters separately. This not only increases the burden on patients but also limits data synchronization and the accuracy of analysis. Furthermore, due to their weak voltage levels (typically in the microvolt range), EEG signals are highly susceptible to interference from environmental noise, electromagnetic interference, and signals from other physiological signals (such as those generated during heart rate and blood oxygenation measurements), thus affecting the accuracy and reliability of the data. Utility Model Content

[0003] The present invention addresses the problem that existing methods for acquiring EEG, heart rate, and blood oxygen data often require multiple independent devices due to signal interference, and provides a device for synchronous acquisition of EEG, heart rate, and blood oxygen data.

[0004] To solve the above problems, this utility model is achieved through the following technical solution:

[0005] A device for synchronously acquiring electroencephalogram (EEG), heart rate, and blood oxygen saturation (PES) data comprises a wearable component, a main unit, heart rate and POS sensors, and an EEG sensor. The main unit is mounted on the wearable component. The heart rate and POS sensors and the EEG sensor are both fixed to the inner surface of the wearable component that is in contact with the human body. The main unit includes a housing, a heart rate and POS signal processing unit, an EEG signal processing unit, and a processor. The heart rate and POS signal processing unit, the EEG signal processing unit, and the processor are all located inside the housing, and the heart rate and POS signal processing unit and the EEG signal processing unit are electrically isolated within the housing. The heart rate and POS signal processing unit includes a heart rate and POS buffer circuit and a heart rate and POS co-mode suppression circuit connected in series. The system includes a control circuit, a heart rate and blood oxygen filtering circuit, a heart rate and blood oxygen notch filter circuit, a heart rate and blood oxygen signal conditioning circuit, a heart rate and blood oxygen amplification circuit, and a heart rate and blood oxygen bias circuit. The heart rate and blood oxygen acquisition sensor is connected to the input terminal of the heart rate and blood oxygen buffer circuit, and the output terminal of the heart rate and blood oxygen bias circuit is connected to the processor. The EEG signal processing unit includes an EEG buffer circuit, an EEG common-mode inhibition circuit, an EEG first-stage filtering circuit, an EEG first-stage amplification circuit, an EEG notch filter circuit, an EEG second-stage filtering circuit, an EEG second-stage amplification circuit, and an EEG bias circuit, connected in series. The EEG acquisition sensor is connected to the input terminal of the EEG buffer circuit, and the output terminal of the EEG bias circuit is connected to the processor.

[0006] In the above scheme, the circuit structure of the first-stage EEG filter circuit and the heart rate and blood oxygen filter circuit is the same, that is, both include resistors R21 to R25, capacitors C21 to C23, and operational amplifier A2; one end of capacitor C2 forms the input terminal of the filter circuit; the other end of capacitor C2 is connected to one end of resistors R21 and R22, the other end of resistor R22 is connected to one end of capacitor C22 and R23, the other end of resistor R23 and one end of capacitor C23 are connected to the non-inverting input terminal of operational amplifier A2; one end of resistors R24 and R25 is connected to the inverting input terminal of operational amplifier A2; the other end of capacitor C22 and resistor R25 is connected to the output terminal of operational amplifier A2, forming the output terminal of the filter circuit; the other ends of resistors R21, R24 and capacitor C23 are grounded.

[0007] In the above scheme, the second-stage EEG filtering circuit includes resistors R31 to R35, capacitors C31 to C32, and operational amplifier A3. One end of resistor R31 forms the input terminal of the filtering circuit. The other end of resistor R31 is connected to one end of capacitors C31 and C32 and resistor R33. The other end of capacitor C32 and one end of resistor R32 are connected to the non-inverting input terminal of operational amplifier A3. One end of resistors R34 and R35 are connected to the inverting input terminal of operational amplifier A3. The other ends of resistors R33 and R35 are connected to the output terminal of operational amplifier A3 to form the output terminal of the filtering circuit. The other ends of resistors R32, R34, and capacitor C31 are grounded.

[0008] In the above scheme, the EEG first-stage amplifier circuit includes resistors R40-R49, capacitors C41-C46, inductor L41, and operational amplifiers A41-A43. One end of resistor R41 forms the positive input terminal of the amplifier circuit, and one end of resistor R42 forms the negative input terminal of the amplifier circuit. The other end of resistor R41 and one end of capacitor C41 are simultaneously connected to the non-inverting input terminal of operational amplifier A42, and the other end of resistor R42 and capacitor C42 are simultaneously connected to the non-inverting input terminal of operational amplifier A41. Resistors R43 and R44 and one end of capacitor C42 are simultaneously connected to the inverting input terminal of operational amplifier A42, and the other end of resistor R43 and resistor R45 and one end of capacitor C43 are simultaneously connected to the inverting input terminal of operational amplifier A41. The other end of resistor R44 and resistor R45 are simultaneously connected to the inverting input terminal of operational amplifier A41. One end of resistor R46 is connected to the output of operational amplifier A42. The other end of resistor R45 and one end of resistor R48 are connected to the output of operational amplifier A41. The other end of resistor R46 and one end of resistor R47 and capacitor C44 are connected to the non-inverting input of operational amplifier A43. The other end of resistor R48 and one end of resistor R49 and capacitor C45 are connected to the inverting input of operational amplifier A43. The other end of resistor R49 and capacitor C45 and one end of resistor R40 and inductor L41 are connected to the output of operational amplifier A43. The other end of inductor L41 and one end of capacitor C46 are connected to form the output of this amplifier circuit. The other ends of resistors R40, R47, C42, C43, C44 and C46 are grounded.

[0009] In the above scheme, the circuit structure of the second-stage EEG filter circuit and the heart rate and blood oxygenation amplifier circuit is the same, that is, it includes resistors R51 to R53 and operational amplifier A5; one end of resistor R51 forms the input terminal of the amplifier circuit; the other end of resistor R51 is connected to the non-inverting input terminal of operational amplifier A5; one end of resistors R52 and R53 is connected to the inverting input terminal of operational amplifier A5; the other end of resistor R53 is connected to the output terminal of operational amplifier A3 to form the output terminal of the amplifier circuit; the other end of resistor R52 is grounded.

[0010] Compared with existing technologies, this invention achieves simultaneous acquisition and analysis of multiple physiological signals through an integrated acquisition device for EEG, heart rate, and blood oxygenation. This reduces the time required to acquire different physiological parameters using different devices, thereby improving diagnostic efficiency. Furthermore, considering the different characteristics of heart rate, blood oxygenation, and EEG signals, mutually isolated and structurally different signal processing circuits are designed to effectively prevent interference between EEG signals and heart rate and blood oxygenation signals, improving the accuracy and reliability of the data, and ultimately enhancing the measurement precision of physiological data. Attached Figure Description

[0011] Figure 1 This is a circuit block diagram of a device for synchronously acquiring brainwave, heart rate, and blood oxygen saturation.

[0012] Figure 2 This is a schematic diagram of the circuit for the first-stage filtering circuit of EEG and the filtering circuit for heart rate and blood oxygenation.

[0013] Figure 3 This is a schematic diagram of the second-stage filtering circuit for EEG.

[0014] Figure 4 This is a schematic diagram of the first-stage amplifier circuit for electroencephalography (EEG).

[0015] Figure 5 This is a circuit diagram of the second-stage filter circuit for EEG and the amplification circuit for heart rate and blood oxygenation.

[0016] Figure 6 This is a physical image of a device for simultaneously acquiring brainwave, heart rate, and blood oxygen saturation data.

[0017] The following are labeled in the diagram: 1. Wearable device, 2. Main unit, 3. Heart rate and blood oxygen acquisition sensor, 4. Electroencephalogram (EEG) acquisition sensor. Detailed Implementation

[0018] 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 specific examples and accompanying drawings.

[0019] A device for synchronously acquiring electroencephalogram (EEG), heart rate, and blood oxygen saturation (PES) signals comprises a wearable device 1, a main unit 2, heart rate and PES sensors 3, and an EEG sensor 4. The main unit 2 is fixed to the wearable device 1 and includes a main unit housing, a heart rate and PES signal processing unit, an EEG signal processing unit, and a processor. The heart rate and PES signal processing unit, the EEG signal processing unit, and the processor are all housed inside the main unit housing, and the heart rate and PES signal processing unit and the EEG signal processing unit are isolated in the signal transmission circuit. The heart rate and PES sensor 3 and the EEG sensor 4 are both fixed to the inner surface of the wearable device 1 that contacts the human body. The heart rate and PES sensor 3 and the EEG sensor 4 are connected to the heart rate and PES signal processing unit and the EEG signal processing unit respectively via two independent signal lines. The heart rate and PES sensor 3 sends the acquired heart rate and PES signals to the heart rate and PES signal processing unit for signal processing. The EEG acquisition sensor 4 sends the acquired EEG signals to the EEG signal processing unit for signal processing. The processor further processes the heart rate and blood oxygenation signals processed by the heart rate and blood oxygenation signal processing unit and the EEG signals processed by the EEG signal processing unit, providing reliable support for decision support and user interaction. The processor has a wireless communication module for sending the detection results to the outside. This invention separates the EEG signal processing unit and the heart rate and blood oxygenation signal processing unit into two independent units, and electrically isolates them through two independent signal transmission circuits. This effectively prevents mutual influence and interference between signals, especially interference with EEG signals, helping to ensure the independence and accuracy of each signal and improving signal quality.

[0020] Considering that the heart rate and blood oxygen acquisition sensor 3 acquires relatively strong heart rate and blood oxygen signals (generally at the millivolt level or higher voltage level), while the brain electrical signal acquired by the brain electrical acquisition sensor 4 is extremely weak (generally at the microvolt level voltage level), this utility model designs different signal processing units according to the different characteristics of the signals in order to maximize the accuracy and reliability of the measurement.

[0021] The heart rate and blood oxygen signal processing unit includes a heart rate and blood oxygen buffer circuit, a heart rate and blood oxygen common-mode suppression circuit, a heart rate and blood oxygen filter circuit, a heart rate and blood oxygen notch filter circuit, a heart rate and blood oxygen signal conditioning circuit, a heart rate and blood oxygen amplification circuit, and a heart rate and blood oxygen bias circuit, such as... Figure 1As shown. The input terminal of the heart rate and blood oxygen signal processing unit, i.e., the input terminal of the heart rate and blood oxygen buffer circuit, is connected to the heart rate and blood oxygen acquisition sensor 3. The output terminal of the heart rate and blood oxygen buffer circuit is connected to the input terminal of the heart rate and blood oxygen common-mode suppression circuit. The output terminal of the heart rate and blood oxygen common-mode suppression circuit is connected to the input terminal of the heart rate and blood oxygen filter circuit. The output terminal of the heart rate and blood oxygen filter circuit is connected to the input terminal of the heart rate and blood oxygen notch filter circuit. The output terminal of the heart rate and blood oxygen notch filter circuit is connected to the input terminal of the heart rate and blood oxygen signal conditioning circuit. The output terminal of the heart rate and blood oxygen signal conditioning circuit is connected to the input terminal of the heart rate and blood oxygen amplification circuit. The output terminal of the heart rate and blood oxygen amplification circuit is connected to the input terminal of the heart rate and blood oxygen bias circuit. The output terminal of the heart rate and blood oxygen signal processing unit, i.e., the output terminal of the heart rate and blood oxygen bias circuit, is connected to the processor.

[0022] The heart rate and blood oxygenation buffer circuit isolates the output of the heart rate and blood oxygenation sensors, preventing load effects and ensuring that the signal is not attenuated or distorted when transmitted to subsequent circuits, thus protecting the integrity of the sensor output signal. The heart rate and blood oxygenation common-mode suppression circuit converts the common-mode signal into a differential-mode signal, effectively eliminating common-mode noise in the heart rate and blood oxygenation signal, reducing external interference, and improving the signal-to-noise ratio. The heart rate and blood oxygenation filtering circuit removes high-frequency noise and artifacts from the signal, retaining useful heart rate and blood oxygenation components, reducing the burden on subsequent processing, and improving signal quality. The heart rate and blood oxygenation notch filter circuit precisely suppresses specific frequency noise (such as power frequency interference) that may exist in the signal, improving signal purity. The heart rate and blood oxygenation signal conditioning circuit further adjusts and optimizes the heart rate and blood oxygenation signal, such as signal stabilization and light intensity adjustment, ensuring signal accuracy and stability. The heart rate and blood oxygenation amplification circuit amplifies the weak heart rate and blood oxygenation signal to an appropriate level for subsequent digital processing or display. The heart rate and blood oxygen bias circuit is used to provide a suitable DC bias for the signal, ensuring that the signal level is within the input range of the processor's ADC and avoiding signal distortion.

[0023] The EEG signal processing unit includes an EEG buffer circuit, an EEG common-mode inhibition circuit, an EEG first-stage filter circuit, an EEG first-stage amplification circuit, an EEG notch filter circuit, an EEG second-stage filter circuit, an EEG second-stage amplification circuit, and an EEG bias circuit, such as... Figure 1As shown. The input terminal of the EEG signal processing unit, i.e., the input terminal of the EEG buffer circuit, is connected to the EEG acquisition sensor 4. The output terminal of the EEG buffer circuit is connected to the input terminal of the EEG common-mode inhibition circuit. The output terminal of the EEG common-mode inhibition circuit is connected to the input terminal of the first-stage EEG filter circuit. The output terminal of the first-stage EEG filter circuit is connected to the input terminal of the first-stage EEG amplifier circuit. The output terminal of the first-stage EEG amplifier circuit is connected to the input terminal of the EEG notch filter circuit. The output terminal of the EEG notch filter circuit is connected to the input terminal of the second-stage EEG filter circuit. The output terminal of the second-stage EEG filter circuit is connected to the input terminal of the second-stage EEG amplifier circuit. The output terminal of the second-stage EEG amplifier circuit is connected to the input terminal of the EEG bias circuit. The output terminal of the EEG signal processing unit, i.e., the output terminal of the EEG bias circuit, is connected to the processor.

[0024] The EEG buffer circuit, serving as the front end of EEG signal acquisition, isolates the EEG acquisition sensor 4 from subsequent circuits, reducing signal loss and interference during transmission while protecting the sensor from high-impedance loads. The EEG common-mode suppression circuit effectively eliminates common-mode noise in the EEG signal, such as power line interference and environmental electromagnetic noise, improving the signal-to-noise ratio and providing high-quality input for subsequent processing. The first-stage EEG filter circuit initially removes high-frequency noise and artifacts from the EEG signal, retaining useful EEG wave components such as alpha and beta waves, preparing for subsequent amplification and further filtering. The first-stage EEG amplification circuit amplifies the weak EEG signal to an appropriate level for subsequent processing and analysis, while maintaining signal linearity and stability. The EEG notch filter circuit precisely suppresses specific frequency noise (such as power line interference) that may exist in the EEG signal, improving signal purity. The second-stage EEG filter circuit further removes interference components from the signal, optimizing signal quality and ensuring the accuracy of subsequent processing and analysis. The second-stage EEG amplification circuit amplifies the EEG signal again as needed to meet the requirements of subsequent digital processing or display. The EEG bias circuit is used to provide a suitable DC bias for the signal, ensuring that the signal level is within the input range of the processor's ADC and avoiding signal distortion.

[0025] Given that heart rate and blood oxygenation signals are relatively strong and have relatively little impact from environmental noise, electromagnetic interference, and EEG signals, this invention employs a single-stage filtering and single-stage amplification scheme for the heart rate and blood oxygenation signal processing unit. However, given that EEG signals are extremely weak and easily affected by environmental noise, electromagnetic interference, and interference from heart rate and blood oxygenation signals, this invention employs a two-stage filtering and two-stage amplification scheme for the EEG signal processing unit.

[0026] Single-stage filtering schemes have limitations in their effectiveness, often failing to completely remove noise and interference from EEG signals, especially when the interference signal is strong or the noise frequency is close to the useful signal frequency. The two-stage filtering scheme employed by the EEG signal processing unit not only filters out more noise and interference signals, resulting in a better output signal and ensuring signal purity, but also provides better control over phase response and reduces phase distortion. This is particularly important for applications requiring high-precision EEG signal processing. The first-stage EEG filtering circuit shares the same circuit structure as the heart rate and blood oxygenation filtering circuits, while the second-stage EEG filtering circuit differs from both.

[0027] The circuit structure of the first-stage EEG filter circuit and the heart rate and blood oxygenation filter circuit is the same, such as... Figure 2 As shown, each circuit includes resistors R21 to R25, capacitors C21 to C23, and operational amplifier A2. One end of capacitor C2 forms the input terminal of the filter circuit. The other end of capacitor C2 is connected to one end of resistors R21 and R22, the other end of resistor R22 is connected to one end of capacitor C22 and R23, and the other end of resistor R23 and one end of capacitor C23 are connected to the non-inverting input terminal of operational amplifier A2. One end of resistors R24 and R25 is connected to the inverting input terminal of operational amplifier A2. The other end of capacitor C22 and resistor R25 is connected to the output terminal of operational amplifier A2, forming the output terminal of the filter circuit. The other ends of resistors R21, R24, and capacitor C23 are grounded.

[0028] The second-stage filtering circuit for EEG, such as Figure 3 As shown, the circuit includes resistors R31 to R35, capacitors C31 to C32, and operational amplifier A3. One end of resistor R31 forms the input terminal of the filter circuit. The other end of resistor R31 is connected to one end of capacitors C31 and C32, as well as one end of resistor R33. The other end of capacitor C32 and one end of resistor R32 are connected to the non-inverting input terminal of operational amplifier A3. One end of resistors R34 and R35 are connected to the inverting input terminal of operational amplifier A3. The other ends of resistors R33 and R35 are connected to the output terminal of operational amplifier A3, forming the output terminal of the filter circuit. The other ends of resistors R32 and R34, as well as capacitor C31, are grounded.

[0029] Single-stage amplification methods amplify noise in the signal, especially when there is already a lot of noise, resulting in a significant decrease in signal quality. Single-stage amplification schemes have limited gain, sometimes failing to amplify weak EEG signals to a sufficient amplitude, affecting subsequent circuit processing. Furthermore, single-stage amplification schemes have a narrow dynamic range, unable to handle large-scale signal intensity variations, potentially leading to signal distortion or loss. The EEG signal processing unit employs a two-stage amplification scheme. The first stage amplifies the weak EEG signal to an appropriate amplitude, avoiding excessive gain that could cause signal distortion. This first-stage amplification also reduces the impact of noise in subsequent circuits. Using a staged amplification effectively reduces noise accumulation and improves the signal-to-noise ratio. Building upon the first stage, the second-stage amplification circuit further amplifies the signal while maintaining signal quality. It also better handles large-scale signal intensity variations, improving the system's dynamic range, and provides sufficient output amplitude for subsequent signal processing. The second-stage EEG filtering circuit shares the same circuit structure as the heart rate and blood oxygenation amplification circuits, while the first-stage EEG amplification circuit differs from both.

[0030] The EEG first-pole amplification circuit, such as Figure 4 As shown, the circuit includes resistors R40-R49, capacitors C41-C46, inductor L41, and operational amplifiers A41-A43. One end of resistor R41 forms the positive input terminal of the amplifier circuit, and one end of resistor R42 forms the negative input terminal. The other end of resistor R41 and one end of capacitor C41 are connected to the non-inverting input terminal of operational amplifier A42, and the other end of resistor R42 and capacitor C42 are connected to the non-inverting input terminal of operational amplifier A41. Resistors R43 and R44, and one end of capacitor C42 are connected to the inverting input terminal of operational amplifier A42, and the other end of resistor R43 and resistor R45, and one end of capacitor C43 are connected to the inverting input terminal of operational amplifier A41. The other end of resistor R44 and one end of resistor R46... Simultaneously connect the output terminal of op-amp A42; connect the other end of resistor R45 and one end of resistor R48 to the output terminal of op-amp A41; connect the other end of resistor R46 and one end of resistor R47 and capacitor C44 to the non-inverting input terminal of op-amp A43; connect the other end of resistor R48 and one end of resistor R49 and capacitor C45 to the inverting input terminal of op-amp A43; connect the other end of resistor R49 and capacitor C45 and one end of resistor R40 and inductor L41 to the output terminal of op-amp A43; connect the other end of inductor L41 and one end of capacitor C46 to form the output terminal of the amplifier circuit; connect the other ends of resistors R40, R47, C42, C43, C44 and C46 to ground.

[0031] The circuit structure of the second-stage EEG filter circuit and the heart rate and blood oxygenation amplification circuit is the same, such as... Figure 5 As shown, the circuit includes resistors R51 to R53 and operational amplifier A5. One end of resistor R51 forms the input terminal of the amplifier circuit. The other end of resistor R51 is connected to the non-inverting input terminal of operational amplifier A5. One end of resistors R52 and R53 are connected to the inverting input terminal of operational amplifier A5. The other end of resistor R53 is connected to the output terminal of operational amplifier A3 to form the output terminal of the amplifier circuit. The other end of resistor R52 is grounded.

[0032] To obtain higher-quality EEG signals, the EEG signal processing unit employs a specific signal processing sequence: first-stage filtering, first-stage amplification, notch filter circuit, second-stage filtering, and second-stage amplification, rather than any other sequence. This is primarily because EEG signals are very weak and easily interfered with by high-frequency noise caused by electromyography (EMG), circuit noise, and other sources. Before amplification, the first-stage filtering circuit removes high-frequency noise, preliminarily purifying the signal and reducing noise interference in subsequent circuits, making it easier to process remaining noise. The first-stage filtering circuit provides a relatively clean signal to the first-stage amplification circuit, preventing noise from being amplified along with the signal and improving the signal-to-noise ratio. The first-stage amplification circuit provides preliminary amplification of the weak EEG signal, increasing signal strength and reducing the impact of noise on subsequent circuits. The first-stage amplification circuit provides a sufficiently strong signal input to the notch filter circuit, ensuring its proper operation and making signal processing easier. The notch filter circuit effectively removes interference at specific frequencies, further improving signal purity. The notch filter circuit provides a signal free from specific frequency interference to the second-stage filter circuit, ensuring its effectiveness and reducing errors. The second-stage filter circuit further filters the signal, removing noise or interference that wasn't completely removed in the first-stage filter, better controlling the phase response and reducing phase distortion. The second-stage filter circuit provides a clearer, more accurate, and higher-quality signal to the second-stage amplifier circuit, ensuring signal purity during amplification. The second-stage amplifier circuit amplifies the filtered signal again, achieving better purification and enhancement for subsequent signal identification and analysis. It also better handles a wide range of signal strength variations, improving the system's dynamic range.

[0033] like Figure 6This is a physical diagram of a device for simultaneously acquiring EEG, heart rate, and blood oxygen saturation signals. The main unit 2 has a charging port, power switch, indicator light, and interface on its casing. An external power supply connects to the charging port; the indicator light illuminates red when charging and turns green when fully charged. The power switch controls the power supply to the main unit 2; pressing it for 2 seconds powers it on, and pressing it again for 2 seconds powers it off. The interface serves as the input for the heart rate and blood oxygen signal processing unit and the EEG signal processing unit. A signal cable is located inside the wearable device 1; one end connects to the interface, and the other end connects to the heart rate and blood oxygen sensor 3 and the EEG sensor 4. In use, the device is worn on the head, ensuring close contact between the heart rate and blood oxygen sensor 3 and the EEG sensor 4 with the scalp while maintaining comfort. Once worn, the power switch is turned on, and the heart rate and blood oxygen sensor 3 and the EEG sensor 4 begin simultaneously acquiring heart rate, blood oxygen, and EEG signals. Heart rate and blood oxygen sensors detect blood flow and light absorbance using photoelectric principles, while an EEG sensor collects brain waves through scalp contact. The collected heart rate, blood oxygen, and EEG signals are transmitted to host computer 2 via signal lines. Host computer 2, as the core of data processing, performs a series of preprocessing and in-depth analyses on the received heart rate, blood oxygen, and EEG signals, including signal filtering, amplification, digitization, and feature extraction, to obtain relevant multimodal data detection results. The processed multimodal data is then wirelessly transmitted (e.g., via Bluetooth, Wi-Fi) to external devices (mobile phones) or cloud platforms for further analysis or storage.

[0034] This invention simultaneously acquires EEG, heart rate, and blood oxygenation signals and designs an effective signal processing unit. The signal processing unit mainly includes an EEG signal processing unit and a heart rate and blood oxygenation signal processing unit that are isolated and designed according to the characteristics of different signals. This enables the simultaneous acquisition of these three physiological signals and effectively reduces interference from EEG signals, providing an efficient and convenient solution for medical diagnosis, neuroscience research, and family health management.

[0035] It should be noted that although the embodiments described above are illustrative, they are not intended to limit the present invention. Therefore, the present invention is not limited to the specific embodiments described above. Any other embodiments obtained by those skilled in the art under the guidance of the present invention without departing from its principles are considered to be within the protection scope of the present invention.

Claims

1. A device for synchronous acquisition of electroencephalogram, heart rate and blood oxygen, characterized in that, The application relates to a wearable device for collecting heart rate and blood oxygen signals and brain electrical signals, which comprises a wearable part (1), a main machine (2), a heart rate and blood oxygen signal collecting sensor (3) and a brain electrical signal collecting sensor (4); the main machine (2) is fixed on the wearable part (1); the heart rate and blood oxygen signal collecting sensor (3) and the brain electrical signal collecting sensor (4) are fixed on the inner surface of the wearable part (1) which is close to the human body. The main machine (2) comprises a main machine (2) shell, a heart rate and blood oxygen signal processing unit, a brain electrical signal processing unit and a processor; the heart rate and blood oxygen signal processing unit, the brain electrical signal processing unit and the processor are arranged in the interior of the main machine (2) shell, and the heart rate and blood oxygen signal processing unit and the brain electrical signal processing unit are electrically isolated in the main machine (2) shell. The heart rate and blood oxygen signal processing unit comprises a heart rate and blood oxygen buffer circuit, a heart rate and blood oxygen common mode suppression circuit, a heart rate and blood oxygen filter circuit, a heart rate and blood oxygen wave trap circuit, a heart rate and blood oxygen signal conditioning circuit, a heart rate and blood oxygen amplification circuit and a heart rate and blood oxygen bias circuit which are connected in series. The heart rate and blood oxygen signal collecting sensor (3) is connected with the input end of the heart rate and blood oxygen buffer circuit, and the output end of the heart rate and blood oxygen bias circuit is connected with the processor. The brain electrical signal processing unit comprises a brain electrical buffer circuit, a brain electrical common mode suppression circuit, a brain electrical first-stage filter circuit, a brain electrical first-stage amplification circuit, a brain electrical wave trap circuit, a brain electrical second-stage filter circuit, a brain electrical second-stage amplification circuit and a brain electrical bias circuit which are connected in series; the brain electrical signal collecting sensor (4) is connected with the input end of the brain electrical buffer circuit, and the output end of the brain electrical bias circuit is connected with the processor.

2. The EEG, heart rate and blood oxygen synchronous acquisition device according to claim 1, characterized in that, The circuit structures of the brain electrical first-stage filter circuit and the heart rate and blood oxygen filter circuit are same, that is, each comprises resistors R21-R25, capacitors C21-C23 and an operational amplifier A2. One end of the capacitor C2 forms the input end of the filter circuit; the other end of the capacitor C2 is connected with one end of the resistor R21 and one end of the resistor R22, the other end of the resistor R22 is connected with one end of the capacitor C22 and one end of the resistor R23, the other end of the resistor R23 and one end of the capacitor C23 are connected with the non-inverting input end of the operational amplifier A2; one end of the resistor R24 and one end of the resistor R25 are connected with the inverting input end of the operational amplifier A2; after the other end of the capacitor C22 and the other end of the resistor R25 are connected with the output end of the operational amplifier A2, the output end of the filter circuit is formed; the other end of the resistor R21, the other end of the resistor R24 and the other end of the capacitor C23 are grounded.

3. The EEG, heart rate and blood oxygen synchronous acquisition device according to claim 1, characterized in that, The brain electrical second-stage filter circuit comprises resistors R31-R35, capacitors C31-C32 and an operational amplifier A3. One end of the resistor R31 forms the input end of the filter circuit; the other end of the resistor R31 is connected with the capacitor C31, the capacitor C32 and one end of the resistor R33, the other end of the capacitor C32 and one end of the resistor R32 are connected with the non-inverting input end of the operational amplifier A3; one end of the resistor R34 and one end of the resistor R35 are connected with the inverting input end of the operational amplifier A3; after the other end of the resistor R33 and the other end of the resistor R35 are connected with the output end of the operational amplifier A3, the output end of the filter circuit is formed; the other end of the resistor R32, the other end of the resistor R34 and the other end of the capacitor C31 are grounded.

4. The EEG, heart rate and blood oxygen synchronous acquisition device according to claim 1, characterized in that, The first electrode amplification circuit of the brain electricity comprises resistors R40-R49, capacitors C41-C46, inductor L41, and operational amplifiers A41-A43. One end of resistor R41 forms the positive input terminal of the amplification circuit, and one end of resistor R42 forms the negative input terminal of the amplification circuit. The other end of resistor R41 and one end of capacitor C41 are connected to the non-inverting input terminal of operational amplifier A42, and resistor R42 and the other end of capacitor C42 are connected to the non-inverting input terminal of operational amplifier A41. Resistor R43, resistor R44, and one end of capacitor C42 are connected to the inverting input terminal of operational amplifier A42, and the other end of resistor R43 and resistor R45 and one end of capacitor C43 are connected to the inverting input terminal of operational amplifier A41. The other end of resistor R44 and one end of resistor R46 are connected to the output terminal of operational amplifier A42, and the other end of resistor R45 and one end of resistor R48 are connected to the output terminal of operational amplifier A41. The other end of resistor R46 and resistor R47 and one end of capacitor C44 are connected to the non-inverting input terminal of operational amplifier A43, and the other end of resistor R48 and resistor R49 and one end of capacitor C45 are connected to the inverting input terminal of operational amplifier A43. The other end of resistor R49 and capacitor C45 and resistor R40 and one end of inductor L41 are connected to the output terminal of operational amplifier A43. The other end of inductor L41 and one end of capacitor C46 form the output terminal of the amplification circuit, and the other ends of resistor R40, resistor R47, capacitor C42, capacitor C43, capacitor C44, and capacitor C46 are grounded.

5. The EEG, heart rate and blood oxygen synchronous acquisition device according to claim 1, characterized in that, The second-stage filter circuit of the brain electricity and the heart rate and blood oxygen amplification circuit have the same circuit structure, i.e., comprising resistors R51-R53 and operational amplifier A5. One end of resistor R51 forms the input terminal of the amplification circuit, and the other end of resistor R51 is connected to the non-inverting input terminal of operational amplifier A5. Resistor R52 and one end of resistor R53 are connected to the inverting input terminal of operational amplifier A5. The other end of resistor R53 is connected to the output terminal of operational amplifier A3 to form the output terminal of the amplification circuit, and the other end of resistor R52 is grounded.

6. The EEG, heart rate and blood oxygen synchronous acquisition device according to claim 1, characterized in that, The processor is provided with a wireless communication module.

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