CN211674226U - Multichannel bioelectricity signal acquisition system - Google Patents

Abstract

The embodiment of the utility model provides a multichannel bio-electricity signal acquisition system, this system includes: the system comprises N electrode leads, M reference leads, a driving lead, a preprocessing channel, a synchronous analog-digital conversion module, a controller, a communication module and a power supply module; the signal acquisition system is used for synchronously acquiring signals of electroencephalogram, electrocardio, myoelectricity, electrooculogram and the like of a living body in a multi-channel manner. The multichannel analog-to-digital conversion modules share a clock signal and an initial signal, multichannel synchronous acquisition is guaranteed, common mode rejection ratio and measurement reliability are improved by means of offset driving, broken line detection and the like, high-frequency and power-frequency noise interference is suppressed through a low-pass filter, a power-frequency wave trap and the like, high quality of bioelectricity signal acquisition of more channels is guaranteed, and accuracy is improved. In addition, in order to improve portability, a 5G communication module is preferably adopted to perform data interaction with a cloud device or a computer.

Description

A multi-channel bioelectric signal acquisition system

technical field

The utility model relates to the technical field of bioelectricity detection, in particular to a multi-channel bioelectrical signal acquisition system.

Background technique

Certain parts of the human body will spontaneously generate weak bioelectrical signals, the most typical of which are EEG, ECG, EMG and OMG. These signals can reflect the body's disease, movement, mental state and even thoughts. Accurate collection of these signals can, on the one hand, study and predict various diseases of the human body. On the other hand, people's thoughts can be analyzed to control external devices. Therefore, the bioelectric acquisition system is widely used in scientific research, military, medical, and life assistance, and has important practical significance.

Among the above signals, the EEG signal is the most complex and the weakest signal. EEG acquisition provides raw data for brain research. Among the many related technologies in brain science research, EEG signal acquisition is a key and basic one. It requires multi-channel synchronous acquisition and is easily affected by external factors, especially the influence of OMG, EMG and ECG, and the acquisition is difficult.

Therefore, how to provide a bioelectric signal acquisition scheme that can collect more bioelectric signals, reduce the mutual interference of various electrical signals, improve the accuracy of EEG signals, and facilitate research is a technology that those skilled in the art need to solve urgently question.

Utility model content

In order to solve all or part of the above technical problems, the present invention provides a multi-channel bioelectric signal acquisition system, which can collect one or more bioelectric signals synchronously, and can adapt to more bioelectric measurement applications.

In order to achieve the above object, the utility model provides the following technical solutions:

An embodiment of the present utility model provides a multi-channel bioelectrical signal acquisition system, comprising: N electrode leads, M reference leads, driving leads, a preprocessing channel, a synchronous analog-to-digital conversion module, a controller, a communication module and a Power module; wherein, N is an integer greater than 1, and M is a positive integer;

The N electrode leads are used to connect with the measurement electrodes connected to the living body, and receive the bioelectric signals obtained by the measurement electrodes;

The M reference leads are used to connect with the reference electrodes connected to the living body, and are used as reference potentials of the N electrode leads;

The drive lead is connected to the offset drive output of the analog-to-digital conversion module through a protection circuit, and is used to output an offset drive signal to improve the common mode rejection capability; the protection circuit is used to limit the current of the offset drive output, to avoid harm to living things;

The receiving end of the preprocessing channel is connected to the N electrode leads or the M reference leads, and is used for the bioelectricity obtained from the N electrode leads or the M reference leads. The signal is preprocessed to obtain the bioelectric output signal;

The synchronous analog-to-digital conversion module is used for parallel and synchronous acquisition of the bioelectrical output signal; the controller is connected to the digital interface of the analog-to-digital conversion module, and is connected to the control terminal of the preprocessing circuit for setting parameters of the preprocessing circuit and the analog-to-digital conversion module; controlling the preprocessing channel to preprocess the bioelectrical signals obtained from the N electrode leads or the M reference leads to obtain a bioelectrical output signal; controlling The analog-to-digital conversion module performs parallel synchronous acquisition and analog-to-digital conversion on the bioelectrical output signal; and receives the bioelectrical signal output by the analog-to-digital conversion module;

a communication module, connected to the controller, for communicating with external equipment; the controller quickly transmits the bioelectrical signal output by the analog-to-digital conversion module to the external equipment through the communication module;

The power supply module provides power support for the preprocessing channel, the synchronous analog-to-digital conversion module, the controller, and the communication module.

Preferably, the bioelectrical signals include: EEG signals, ECG signals, EMG signals, and EMG signals.

Preferably, the analog-to-digital conversion module includes:

an offset signal unit for generating an offset drive signal;

The disconnection detection unit is used to realize the disconnection detection function;

An analog-to-digital conversion unit for converting analog signals to digital signals.

Preferably, the preprocessing circuit includes: a protection device, a DC blocking capacitor, a low-pass filter, a power frequency trap, and a controllable amplifier;

The protection device is connected to the electrode lead or the reference lead, and is used to protect the subsequent circuit;

For the DC blocking capacitor, the front stage is connected with the lead protection device, and the rear stage is connected with the low-pass filter; it is used to filter out the DC component in the original bioelectrical signal; when the DC component does not need to be filtered out, the controllable switch 1. Short-circuit it; when using the offset drive circuit or the electrode disconnection detection circuit, the controllable switch 1 should be closed to short-circuit the DC blocking capacitor;

In the low-pass filter, the front stage is connected with the DC blocking capacitor module, and the rear stage is connected with the power frequency notch filter; it is used for filtering out unwanted external high-frequency interference signals;

The power frequency notch filter is connected with the low-pass filter and the controllable amplifier; it is used for filtering the power frequency interference signal coupled in the original bioelectrical signal;

The controllable amplifier is connected to the power frequency trap and the analog-to-digital conversion module, and its control end is connected to the controller; it is used to controllably amplify the original bioelectrical signal, and its control signal is controlled by When the original bioelectric signal does not need to be amplified, it can be short-circuited through the controllable switch 2; the gain of the controllable switch 2 and the controllable amplifier is controlled by the controller.

Preferably, the synchronous analog-to-digital conversion module and the preprocessing channel are respectively connected to the controller, which can realize synchronous signal acquisition of multiple analog-to-digital conversion devices, and have a unified start signal and clock signal;

When any of the ADCs can realize the synchronous acquisition of multiple bioelectrical output signals; has one reference signal input port; outputs one offset drive signal; realizes the function of disconnection detection;

Each analog-to-digital conversion module has on-chip or external precise clock source and reference source;

When the configuration of multiple analog-to-digital conversion modules is the same, more than one ADC is connected by daisy chain to save the digital interface of the controller; way to connect with the controller digital interface.

Preferably, the controller is connected with each preprocessing module, each channel analog-to-digital conversion module, a memory, and a communication interface; it is used to realize the overall control of the bioelectric signal acquisition system, as well as the parameter configuration of each module, ADC Receive the output signal, and send the data to the upper computer;

The controller is implemented by DSP, ARM or FPGA device programming.

Preferably, the communication module is a 5G wireless communication module; it is used to send all the data collected by the bioelectric signal collection system to the cloud device or the host computer.

Preferably, the 5G wireless communication module is communicatively connected to an external device having a 5G transceiver module;

The external devices include: network cloud devices connected to the 5G network and/or bioelectrical signal processing computers connected to the 5G network;

The network cloud device is used for instant storage or instant action response to the bioelectrical output signal;

The bioelectrical signal processing computer is used for real-time processing of the bioelectrical output signal.

Preferably, the analog-to-digital conversion module adopts a unipolar lead mode or a bipolar lead mode; when a unipolar lead is used, the signal fed from the P terminal of each electrode lead connected to the analog-to-digital conversion module is in the form of a unipolar lead. The signal fed into the reference lead is used as the reference potential; when a bipolar lead is used, the P terminal of each electrode lead takes the N terminal of the corresponding electrode lead as the reference potential.

An embodiment of the present utility model provides a multi-channel bioelectrical signal acquisition system, comprising: N electrode leads, M reference leads, driving leads, a preprocessing channel, a synchronous analog-to-digital conversion module, a controller, a communication module and a A power supply module; wherein, N is an integer greater than 1, and M is a positive integer; N number of the electrode leads are used to connect to the measurement electrode connected to the living body, and receive the bioelectric signal obtained by the measurement electrode; The reference lead is used to connect with the reference electrode connected to the living body, and is used as the reference potential of the N electrode leads; the drive lead is driven and output by the offset of the protection circuit and the analog-to-digital conversion module connected to output the offset drive signal to improve the common mode rejection capability; the protection circuit is used to limit the current output by the offset drive to avoid harm to living beings; the receiving end of the preprocessing channel is connected to N The electrode leads or the M reference leads are connected, and are used to preprocess the bioelectric signals obtained by the N electrode leads or the M reference leads to obtain a bioelectric output signal; The synchronous analog-to-digital conversion module is used for parallel and synchronous acquisition of the bioelectrical output signal; the controller is connected to the digital interface of the analog-to-digital conversion module, and is connected to the control terminal of the preprocessing circuit for setting the preset processing the parameters of the circuit and the analog-to-digital conversion module; controlling the preprocessing channel to preprocess the bioelectrical signals obtained by the N electrode leads or the M reference leads to obtain a bioelectrical output signal; The analog-to-digital conversion module performs parallel synchronous acquisition and analog-to-digital conversion on the bioelectrical output signal; receives the bioelectrical signal output by the analog-to-digital conversion module; a communication module is connected to the controller for communicating with external equipment; The controller quickly transmits the bioelectrical signal output by the analog-to-digital conversion module to the external equipment through the communication module; the power supply module is the preprocessing channel, the synchronous analog-to-digital conversion module, the controller, The communication module provides power support, the utility model can collect more bioelectrical signals, suppress common mode interference, detect electrode connection state, reduce mutual interference of various electrical signals, improve the accuracy of EEG signals, and facilitate research.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that are required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, other implementation drawings can also be derived from the provided drawings without any creative effort.

The structures, proportions, sizes, etc. shown in this specification are only used to cooperate with the contents disclosed in the specification, so as to be understood and read by those who are familiar with the technology, and are not used to limit the conditions that the present invention can be implemented. The technical substantive significance, the modification of any structure, the change of the proportional relationship or the adjustment of the size, without affecting the effect that the utility model can produce and the purpose that can be achieved, should still fall within the scope disclosed in the present utility model. The technical content must be within the scope of coverage.

1 is a schematic diagram of the composition and structure of a multi-channel bioelectrical signal acquisition system provided by a specific embodiment of the present invention;

2 is a schematic diagram of the composition and structure of a preprocessing circuit provided by a specific embodiment of the present invention;

3 is a schematic structural diagram of a circuit of a double-T-type wave trap provided by a specific embodiment of the present invention;

4 is a schematic structural diagram of an implementation manner of a unipolar lead of a multi-channel bioelectrical signal acquisition system provided by an embodiment of the present invention;

5 is a schematic structural diagram of an implementation manner of bipolar leads of a multi-channel bioelectrical signal acquisition system provided by an embodiment of the present invention;

6 is a schematic diagram of a daisy-chain connection mode between multiple ADCs in an embodiment of the present invention;

7 is a schematic diagram of a standard connection mode between multiple ADCs in an embodiment of the present invention;

8 is a schematic diagram of interaction between a multi-channel bioelectrical signal acquisition system using a 5G module and an external device provided by a specific embodiment of the present invention;

FIG. 9 is a flowchart of a control method for a bioelectric signal acquisition system provided by an embodiment of the present invention.

Detailed ways

The embodiments of the present invention will be described below by specific specific embodiments. Those who are familiar with the technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are of the present invention. Some examples, but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Please refer to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 1 is the composition of a multi-channel bioelectrical signal acquisition system provided by a specific embodiment of the present invention Schematic diagram of the structure; FIG. 2 is a schematic structural diagram of a preprocessing circuit provided by a specific embodiment of the present utility model; FIG. 3 is a schematic structural diagram of a double-T-type wave trap circuit provided by a specific embodiment of the present utility model; Fig. 4 is a schematic structural diagram of a monopolar lead implementation of a multi-channel bioelectrical signal acquisition system provided by an embodiment of the present invention; Fig. 5 is a bipolar lead of a multi-channel bioelectrical signal acquisition system provided by an embodiment of the present invention Schematic diagram of the structure of the lead implementation; FIG. 6 is a schematic diagram of a daisy-chain connection mode among multiple ADCs in an embodiment of the present invention; FIG. 7 is a schematic diagram of a standard connection mode between multiple ADCs in an embodiment of the present invention; FIG. 8 is a schematic diagram of the present utility model. A specific embodiment provides a schematic diagram of a multi-channel bioelectrical signal acquisition system interacting with an external device using a 5G module.

An embodiment of the present utility model provides a multi-channel bioelectrical signal acquisition system, comprising: N electrode leads, M reference leads, driving leads, a preprocessing channel, a synchronous analog-to-digital conversion module, a controller, a communication module and a A power supply module; wherein, N is an integer greater than 1, and M is a positive integer; N number of the electrode leads are used to connect to the measurement electrode connected to the living body, and receive the bioelectric signal obtained by the measurement electrode; The reference lead is used to connect with the reference electrode connected to the living body, and is used as the reference potential of the N electrode leads; the drive lead is driven and output by the offset of the protection circuit and the analog-to-digital conversion module connected to output the offset drive signal to improve the common mode rejection capability; the protection circuit is used to limit the current output by the offset drive to avoid harm to living beings; the receiving end of the preprocessing channel is connected to N The electrode leads or the M reference leads are connected, and are used to preprocess the bioelectric signals obtained by the N electrode leads or the M reference leads to obtain a bioelectric output signal; The synchronous analog-to-digital conversion module is used for parallel and synchronous acquisition of the bioelectrical output signal; the controller is connected to the digital interface of the analog-to-digital conversion module, and is connected to the control terminal of the preprocessing circuit for setting the preset processing the parameters of the circuit and the analog-to-digital conversion module; controlling the preprocessing channel to preprocess the bioelectrical signals obtained by the N electrode leads or the M reference leads to obtain a bioelectrical output signal; The analog-to-digital conversion module performs parallel synchronous acquisition and analog-to-digital conversion on the bioelectrical output signal; receives the bioelectrical signal output by the analog-to-digital conversion module; a communication module is connected to the controller for communicating with external equipment; The controller quickly transmits the bioelectrical signal output by the analog-to-digital conversion module to the external equipment through the communication module; the power supply module is the preprocessing channel, the synchronous analog-to-digital conversion module, the controller, The communication module provides power support.

Specifically, the communication module is preferably a 5G communication module and/or a USB communication module. Optionally, the system further includes a memory connected to the controller for storing the collected bioelectric signal data. The electrode leads are responsible for feeding the measurement electrodes placed on various parts of the user's body into the preprocessing channel of the bioelectrical signal acquisition system. The reference lead is responsible for feeding the reference electrode corresponding to the measurement electrode into the preprocessing channel of the bioelectrical signal acquisition system. A reference lead can correspond to multiple electrode leads. The drive leads are used to feed the offset drive signal output from the analog-to-digital conversion module to a certain part of the human body. When measuring EEG or OMG, the drive leads are often connected to the person's earlobe or mastoid, and when measuring ECG or EMG, the drive leads are often connected to the person's right leg. Optionally, the electrode leads, reference leads, and drive leads may specifically include dry electrodes and/or wet electrodes, electrode feed lines, and electrical interfaces (eg, BNC interfaces).

The synchronous acquisition of EEG, EMG and ECG signals and EEG signals can offset the interference signals in the EEG signals to a certain extent and improve the accuracy of EEG acquisition. ECG signals can help to judge patients with cardiovascular-related diseases and emotional fluctuations; for EEG applications using motor imagery, more accurate and rapid judgments can be obtained by combining EMG signals; OMG signals are closely related to EEG signals. Especially in sleep quality assessment and research related to imagination, it is necessary to combine the analysis of OMG signals.

In order to accurately collect the above-mentioned bioelectric signals, on the one hand, it is necessary to ensure that the electrodes are connected in good condition, and to eliminate external interference as much as possible. In a general environment, the main sources of interference are power frequency (50Hz) signals, and high-frequency radio waves in the environment. In addition, the interference is often superimposed on each signal in the form of common mode, so it is necessary to improve the common mode rejection ratio of the signal. On the other hand, appropriate magnification and ADC bits should be used to accurately collect microvolt-level bioelectric signals.

Most of the existing bioelectric signal acquisition systems use wired signal transmission, which can only be applied to certain medical and experimental sites. In order to facilitate the application in life, the bioelectric signal acquisition system should have wireless data communication capability. However, because the bioelectricity acquisition system needs to transmit a large amount of data in real time, it is necessary to adopt a wireless transmission method with extremely fast data transmission speed.

Electrode leads and reference leads are connected to their respective preprocessing channels. The preprocessing channel structure is shown in Figure 2. The protection circuit is to prevent electrostatic breakdown of the human body or interfere with the normal operation of the multi-channel bioelectricity acquisition system, and to prevent the leakage of electricity of the bioelectricity acquisition system from harming the human body. The protection circuit can be realized by TVS tube, Zener diode, gas discharge tube and other devices.

Usually due to environmental influences, the bioelectrical signal will be superimposed with DC drift that is not related to the signal. Because the bioelectrical signal is often very weak, especially the EEG signal is sometimes 2 to 3 orders of magnitude lower than the DC drift signal. In order to prevent the signal from being overwhelmed by the DC drift signal, in the preprocessing channel, the DC blocking capacitor is used to filter the bioelectric signal. When it is necessary to study the bioelectric signal near the DC, the DC blocking capacitor can be short-circuited through the controllable switch 1 connected in parallel with the DC blocking capacitor. The controllable switch 1 is controlled by the controller.

It is generally believed that the frequency of bioelectrical signals is concentrated in the frequency range of 0.5 to 100 Hz. In order to prevent the radio high-frequency signals widely existing in the environment from interfering with weak EEG signals, a low-pass filter is used in the preprocessing channel to filter out unwanted high-frequency signal components. .

The power frequency AC signal of 50Hz commonly exists in the environment, and this frequency is located in the frequency range of bioelectrical signals. In order to accurately collect the bioelectrical signal, the preprocessing channel uses a power frequency notch filter to filter out the 50Hz power frequency signal in the environment from the bioelectrical signal. In order not to affect the bioelectrical signal beyond the power frequency as much as possible, the notch filter should have the characteristics of narrow bandwidth, high Q value, and the center frequency consistent with the power frequency. Preferably, the structure of double T-type wave traps as shown in FIG. 3 is adopted.

Optionally, the preprocessing circuit further includes a controllable amplifier to amplify the weak original bioelectrical signal to an amplitude range that is convenient for collection, so as to distinguish more details of the bioelectrical signal. When the original bioelectrical signal does not need to be amplified, it can be short-circuited through the controllable switch 2 . The gain of the controllable switch 2 and the controllable amplifier is controlled by the controller. Preferably, the controllable amplifier has a high common-mode rejection ratio, high input impedance, and low input noise.

The synchronous analog-to-digital conversion module is used for parallel and synchronous acquisition of multiple bioelectrical output signals. Multiple analog-to-digital conversion devices (ADCs) can be acquired synchronously, with a unified start signal (START) and clock signal (CLK). Any ADC can realize the synchronous acquisition of multiple bioelectric output signals; it has one reference signal input port; it can realize the generation of offset driving signal and the function of disconnection detection. Each analog-to-digital conversion module has on-chip or external precision clock source and reference source. Any analog-to-digital conversion module can be selected for unipolar lead or bipolar lead acquisition. When a unipolar lead is used, the signal fed into the P terminal of each electrode lead connected to the analog-to-digital conversion module takes the signal fed into the reference lead as the reference potential. When bipolar leads are used, the P terminal of each electrode lead takes the corresponding lead N terminal as the reference potential. The schematic diagram of the structure of unipolar leads and bipolar leads is shown in Figure 4. When the configurations of multiple analog-to-digital conversion modules are the same, optionally, multiple ADCs are connected in a daisy-chain manner to save the digital interface of the controller. When multiple analog-to-digital conversion modules have different configuration possibilities, they are respectively connected to the digital interface of the controller in a standard manner. The daisy-chain connection and standard connection are shown in Figure 5.

The analog-to-digital conversion module of the system is preferably a bioelectricity acquisition analog-to-digital converter represented by the ADS1299-x series.

The controller is responsible for the overall control of the system, the parameter configuration of each module, the reception of ADC output signals, and the transmission of bioelectric signals to the host computer through the communication module. The analog-to-digital converted signal is output to the controller. Then, in a certain queue order, the 5G wireless transceiver module is sent to the computer or cloud device that is also connected to the 5G wireless transceiver module at high speed. or perform the corresponding control operation. In a specific embodiment, the controller may be implemented by an ARM chip, or an FPGA chip, or a DSP chip or the like.

In fact, after the system is started, the host computer can write the default parameters into the corresponding register position in the controller to initialize the bioelectricity acquisition system. Afterwards, the parameters of the preprocessing module and the analog-to-digital conversion module can be adjusted automatically or manually by the user according to the needs of the application, and then the collected data is sent back to the upper computer.

The communication module is responsible for sending all the data collected by the bioelectric signal acquisition system to the cloud device or the host computer. Due to the huge amount of data to be transmitted, in order to ensure the real-time nature of signal transmission, 5G wireless communication modules are preferred.

On the basis of the above specific embodiments, in order to prevent the controller or external equipment from processing the bioelectric signal data in a timely manner, resulting in data loss, a memory may be connected to the controller, and the bioelectric signal data may be temporarily stored and stored. Permanent storage, so that when the bioelectric signal acquisition system is not working on the Internet, the bioelectric signal data can also be collected and stored, which is convenient for later use.

The 5G communication module is communicatively connected to an external device having a 5G transceiver module; the external device includes: a network cloud device connected to the 5G network and/or a bioelectric signal processing computer connected to the 5G network; the network cloud device is used for Real-time storage or response action is performed on the bioelectrical signal; the bioelectrical signal processing computer is used for real-time processing of the bioelectrical signal. Of course, after the external device is connected to the bioelectric signal acquisition system, the authority of the external device can also be authenticated, and the external device can adjust the control parameters of the controller, for example, the controller can adjust the gain of the controllable amplifier of the preprocessing module. , the sampling rate of the analog signal in the analog-to-digital conversion module can also be adjusted, and of course, other parameters that can be controlled by the controller can also be adjusted.

In a specific embodiment, the analog-to-digital conversion module is implemented by multiple ADS1299-8 chips. The ADS1299-8 chip integrates 8 program-controlled amplifiers (PGA) with built-in oscillator and reference voltage source. One piece of ADS1299-8 corresponds to up to 8 sets of measurement electrodes, one reference electrode and one drive electrode. When the unipolar lead mode is used, the signals of the 8 measuring electrodes are fed into the P terminals of each group of channels after the preprocessing circuit respectively, that is, the positive terminal of each PGA, while the reference electrode signal is fed into each group simultaneously after the preprocessing circuit. The N terminal of the channel is the negative terminal of each PGA. The difference between the signals at the P-N terminals is amplified by the PGA and then subjected to synchronous analog-to-digital conversion. When bipolar leads are used, each group of electrode leads contains the signals of two electrodes, which are respectively fed into the P-terminal and N-terminal of each group of channels after the preprocessing circuit. That is, when bipolar leads are used, AD1299-8 is connected to 16 input electrodes at the same time, and every two input electrodes are used as a group of input signals. The same clock signal CLK and the same acquisition start signal START are shared among multiple ADS1299-8s to ensure the synchronization of sampling. The clock signal can be generated by an external clock source, and the acquisition start signal is generated by the controller. ADS1299-8 integrates an offset drive circuit, which can use its offset drive signal as the right leg drive signal, directly connect to the corresponding parts of the human body, and realize negative feedback adjustment for each measurement electrode, so as to suppress common mode interference and reduce bioelectricity. The purpose of signal offset to the appropriate voltage range. For different types of bioelectrical signals, due to the large difference in signal amplitude, or the distance between physiological positions. It is preferable to use different ADS1299-8 for acquisition. ADS1299-8 also integrates an electrode disconnection detection circuit, which can detect in real time whether each measuring electrode is firmly in contact with the corresponding position of the human body. When using the offset drive circuit and the electrode disconnection detection circuit, the controllable switch 1 should be closed and the DC blocking capacitor should be short-circuited. The communication interface between ADS1299-8 and the controller is SPI interface. Multiple ADS1299-8s can be connected to the controller through a daisy chain, so that only one SPI interface of the controller needs to be occupied, and the data of multiple ADS1299-8s are output sequentially. However, when the configurations of multiple ADS1299-8s are not the same, such as when different ADS1299-8s are connected to EEG, ECG, EMG and EMG respectively, the internal PGA magnification should be set differently, so ADS1299-8 cannot be used The daisy-chain connection method should be used instead of the standard connection method, that is, each ADS1299-8 occupies one SPI interface of the controller for data communication.

The inventor of the present application found in practice that some bioelectrical signals must be measured in real life before they can be accurately measured, while the existing technology can only be measured in the laboratory. The electrical signal acquisition equipment restricts the acquisition accuracy of bioelectrical signals. In order to make the measurement of bioelectrical signals more accurate, and to obtain bioelectrical signals in people's actual life, the utility model of the present application uses a 5G communication module to make bioelectrical signal acquisition that can be applied in real life. The system is easy for users to carry and can adapt to more applications.

The embodiment of the utility model increases the portability of the bioelectricity collection system. The bioelectric acquisition system using wireless signal transmission still has the defect of slow communication speed. To this end, an embodiment of the present invention proposes a bioelectric signal acquisition system based on 5G wireless communication, and my country officially issues a 5G operating license, which means that my country has officially entered the 5G era. In the future, 5G communication will be widely used in my country, and the corresponding supporting software and hardware support facilities will be rapidly improved. 5G communication has the characteristics of ultra-reliable, low-latency, wide bandwidth, and high speed. With the powerful performance of 5G communication, fast communication of bioelectric signals can be realized, and more bioelectric data can be transmitted in the same time, without the need for Data reduction is done that way. Therefore, the embodiments of the present invention will comprehensively improve the real-time, accuracy and portability of bioelectric signal acquisition.

Please refer to FIG. 9 . FIG. 9 is a flowchart of a control method for a bioelectric signal acquisition system according to an embodiment of the present invention.

An embodiment of the present utility model provides a method for controlling a bioelectrical signal acquisition system, which is applied to the bioelectrical signal acquisition system described in any of the above embodiments, including:

Step S11: setting the parameters of the preprocessing circuit and the analog-to-digital conversion module;

Step S12: controlling the preprocessing channel to preprocess the bioelectric signals obtained by the N electrode leads or the M reference leads, to obtain a bioelectric output signal;

Step S13: controlling the analog-to-digital conversion module to perform parallel synchronous acquisition and analog-to-digital conversion on the bioelectric output signal;

Step S14: Receive the bioelectric signal output by the analog-to-digital conversion module.

Although the present utility model has been described in detail above with general description and specific embodiments, some modifications or improvements can be made on the basis of the present utility model, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not departing from the spirit of the present invention belong to the protection scope of the present invention.

Claims (9)

1. A multi-channel bioelectrical signal acquisition system, comprising: the system comprises N electrode leads, M reference leads, a driving lead, a preprocessing channel, a synchronous analog-digital conversion module, a controller, a communication module and a power supply module; wherein N is an integer greater than 1, and M is a positive integer;

the N electrode leads are used for being connected with a measuring electrode connected to a living body and receiving a bioelectrical signal acquired by the measuring electrode;

m of said reference leads for connection to reference electrodes connected to the biological body for use as reference potentials for N of said electrode leads;

the drive lead is connected with the offset drive output of the analog-to-digital conversion module through a protection circuit and is used for outputting an offset drive signal so as to improve the common mode rejection capability; the protection circuit is used for limiting the current output by the offset drive so as to avoid damage to organisms;

the receiving end of the preprocessing channel is connected with the N electrode leads or the M reference leads and is used for preprocessing bioelectrical signals acquired by the N electrode leads or the M reference leads to acquire bioelectrical output signals;

the synchronous analog-to-digital conversion module is used for carrying out parallel synchronous acquisition on the bioelectricity output signals; the controller is connected with the digital interface of the analog-to-digital conversion module, connected with the control end of the preprocessing circuit and used for setting parameters of the preprocessing circuit and the analog-to-digital conversion module; controlling the preprocessing channel to preprocess the bioelectrical signals acquired by the N electrode leads or the M reference leads to acquire bioelectrical output signals; controlling the analog-to-digital conversion module to perform parallel synchronous acquisition and analog-to-digital conversion on the bioelectricity output signals; receiving the bioelectric signal output by the analog-to-digital conversion module;

the communication module is connected with the controller and is used for being in communication connection with external equipment; the controller rapidly transmits the bioelectricity signal output by the analog-to-digital conversion module to external equipment through the communication module;

the power module is the preprocessing channel, the synchronous analog-to-digital conversion module, the controller and the communication module provide power support.

2. The bioelectrical signal acquisition system according to claim 1,

the bioelectric signal includes: electroencephalogram signals, electrocardiosignals, myoelectricity signals and eye electric signals.

3. The bioelectrical signal acquisition system according to claim 1,

the analog-to-digital conversion module comprises:

an offset signal unit for generating an offset driving signal;

the broken line detection unit is used for realizing a broken line detection function;

and the analog-to-digital conversion unit is used for converting the analog signal into a digital signal.

4. The bioelectrical signal acquisition system according to claim 1, wherein the preprocessing circuit comprises: the protection device comprises a blocking capacitor, a low-pass filter, a power frequency wave trap and a controllable amplifier;

the protection device is connected with the electrode lead or the reference lead and is used for protecting a rear-stage circuit;

the front stage of the blocking capacitor is connected with the lead protection device, and the rear stage of the blocking capacitor is connected with the low-pass filter; the device is used for filtering out a direct current component in an original bioelectricity signal; when the direct current component does not need to be filtered, the direct current component is short-circuited through the controllable switch 1; when an offset driving circuit or an electrode disconnection detection circuit is adopted, the controllable switch 1 is closed, and the blocking capacitor is short-circuited;

the front stage of the low-pass filter is connected with the blocking capacitor module, and the rear stage of the low-pass filter is connected with the power frequency wave trap; the device is used for filtering out unwanted external high-frequency interference signals;

the power frequency wave trap is connected with the low-pass filter and the controllable amplifier; the device is used for filtering out coupled power frequency interference signals in the original bioelectricity signals;

the controllable amplifier is connected with the power frequency wave trap and the analog-to-digital conversion module, and the control end of the controllable amplifier is connected with the controller; the device is used for controllably amplifying the original bioelectric signal, and a control signal of the device is sent by the controller; when the original bioelectric signal does not need to be amplified, the bioelectric signal can be short-circuited through the controllable switch 2; the gain of the controllable switch 2 and the controllable amplifier is controlled by the controller.

5. The bioelectrical signal acquisition system according to claim 1, wherein the synchronous analog-to-digital conversion module and the preprocessing channel are respectively connected to the controller, so as to realize signal synchronous acquisition of a plurality of analog-to-digital conversion devices, and have a unified start signal and clock signal;

when any ADC can realize synchronous acquisition of multiple paths of bioelectricity output signals; the device is provided with a reference signal input port; outputting a path of offset driving signal; the function of detecting broken wires is realized;

each analog-to-digital conversion module is provided with an on-chip or external accurate clock source and a reference source;

when the configuration of a plurality of analog-to-digital conversion modules is the same, more than one ADC is connected in a daisy chain mode so as to save the digital interface of the controller; when different configurations exist in the plurality of analog-to-digital conversion modules, the analog-to-digital conversion modules are respectively connected with the digital interface of the controller according to a standard mode.

6. The bioelectrical signal acquisition system according to claim 1,

the controller is connected with the preprocessing modules, the channel analog-to-digital conversion modules, the memory and the communication interface; the system is used for realizing the overall control of the bioelectricity signal acquisition system, the parameter configuration of each module, the receiving of ADC output signals and the sending of data to an upper computer;

the controller is realized by programming of a DSP, an ARM or an FPGA device.

7. The bioelectrical signal acquisition system according to claim 1,

the communication module is a 5G wireless communication module; the system is used for sending all data acquired by the bioelectricity signal acquisition system to cloud equipment or an upper computer.

8. The bioelectrical signal acquisition system according to claim 7,

the 5G wireless communication module is in communication connection with external equipment with a 5G transceiver module;

the outside plant includes: the system comprises network cloud equipment connected to a 5G network and/or a bioelectricity signal processing computer connected to the 5G network;

the network cloud equipment is used for carrying out instant storage or instant action response on the bioelectricity output signal;

and the bioelectrical signal processing computer is used for carrying out instant processing on the bioelectrical output signal.

9. The bioelectrical signal acquisition system according to any one of claims 1 to 8,

the analog-digital conversion module adopts a unipolar lead mode or a bipolar lead mode; when a unipolar lead is adopted, the P end fed-in signals of each electrode lead connected with the analog-to-digital conversion module use the reference lead fed-in signals as reference potential; when bipolar leads are used, the P end of each electrode lead takes the N end of the corresponding electrode lead as a reference potential.

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