Array type multi-channel electromyographic signal measuring system

Abstract

The utility model discloses an array type multichannel electromyographic signal measuring system for measuring electromyographic signals. The array type multichannel electromyographic signal measuring system comprises a bioelectricity sampling electrode plate, a signal processing module and a wireless main control module. The bioelectricity sampling electrode plate collects original electromyographic signals and transmits the original electromyographic signals to the signal processing module, the signal processing module completes processing such as amplification and filtering of the electromyographic signals, and the processed electromyographic signals are sent to the computer through the wireless main control module to be analyzed and stored. According to the bioelectricity sampling electrode plate, due to the design of redundant electrodes distributed in an array mode, a user without corresponding basic professional knowledge does not need to be guided by a specially-assigned person to wear the bioelectricity sampling electrode plate, under the condition that various wearing modes are adopted, the bioelectricity sampling electrode plate can be accurately aligned to an optimal sampling point of an electromyographic signal, so that the electromyographic signal which is more accurate and better in quality can be obtained, and the reliability of the bioelectricity sampling electrode plate is improved. And analysis and application of bio-electricity signals in the use process of a user are facilitated.

Description

Technical Field

[0001] The utility model relates to a bioelectric signal measurement system, in particular to an array-type multi-channel myoelectric signal measurement system. Background Art

[0002] Myoelectric devices are widely used in the fields of medicine and sports science. They help doctors and researchers understand the functional status of muscles by measuring and recording myoelectric activity. Among them, surface electromyography (sEMG) is a common way to collect myoelectric signals. It measures myoelectric activity by placing electrodes on the surface of the skin.

[0003] In the field of clinical rehabilitation, electromyographic signals are mainly used for monitoring, evaluation or diagnosis in clinical medicine or clinical rehabilitation fields such as chronic nonspecific low back pain, paraspinal muscle pathological changes and scoliosis, Parkinson's disease, dysphagia or neuromuscular function rehabilitation in patients with stroke.

[0004] In the field of sports science, surface electromyography can well show the force characteristics of muscles during exercise. It is intuitive, fast, and provides on-site feedback. It can also be analyzed synchronously with the results of other sports measurement methods. Its application scenarios mainly include comparing the degree of stimulation of the same muscle by different actions or loads, detecting the coordination and timing between different muscles, comparing the balance between the left and right sides to correct movements and prevent injuries, and sports rehabilitation.

[0005] However, existing surface electromyography (sEMG) devices have important defects in the design and use of surface electromyography (sEMG) signals, including:

[0006] 1) The acquisition of surface electromyography (sEMG) signals first requires precise electrode placement. Most electromyography devices use wet electrodes, metal wire electrodes or spring probes. The placement of the electrodes needs to be aligned with the direction of muscle movement, otherwise it may cause signal distortion. However, precise electrode placement requires professional knowledge and skills, which is a challenge for ordinary users and requires special guidance in wearing the device.

[0007] 2) The quality of the collected sEMG signal is affected by many factors, including the type of electrode, placement, skin conditions (such as humidity and cleanliness), and environmental noise. In particular, power frequency interference usually comes from power lines and electrical equipment. They generate electromagnetic interference at a frequency of 50 or 60 Hz, which is within the frequency range of sEMG signals and may cause distortion of sEMG signals, thereby affecting signal analysis. Summary of the invention

[0008] In order to solve the technical problems and needs existing in the background technology, the utility model provides an array-distributed redundant electrode design to solve the defects of the prior art that the use requires professional knowledge, the signal quality is easily disturbed and the spatial resolution is low.

[0009] The specific technical solution of the utility model is as follows:

[0010] An array-type multi-channel electromyographic signal measurement system, the array-type multi-channel electromyographic signal measurement system comprises a bioelectric sampling electrode plate, a signal processing module and a wireless main control module; the bioelectric sampling electrode plate is connected to the signal processing module, and the signal processing module is connected to the wireless main control module;

[0011] It is characterized in that

[0012] The bioelectric sampling electrode plate is composed of one or more array-type bioelectric sampling electrode modules;

[0013] The array-type bioelectric sampling electrode module includes one or more identical electrode groups, each electrode group includes a sampling electrode unit and an auxiliary electrode unit;

[0014] The sampling electrode unit has an even number of electrodes arranged longitudinally at equal intervals, and the even number of electrodes arranged longitudinally at equal intervals form a plurality of bioelectric differential sampling channels;

[0015] The auxiliary electrode unit includes one or more electrodes, and the electrode types include one or both of the right leg drive circuit (RLD) electrode and the reference electrode (REF). The auxiliary electrode unit is arranged longitudinally with the sampling electrode unit in space and keeps a certain distance;

[0016] The electrode groups are arranged horizontally at equal intervals, and one or more electrode groups form an array-type bioelectric sampling electrode module.

[0017] The electrodes of each electrode group in the bioelectric sampling electrode plate cover the effective electromyographic signal collection area of ​​the muscle fibers at the measurement site as a whole.

[0018] The electrode unit of each electrode group on the bioelectric sampling electrode plate is a conductive material, and the electrode unit is combined with a flexible substrate to form a flexible sampling electrode plate.

[0019] The conductive material of the electrode unit includes but is not limited to gold, copper, silver or graphite.

[0020] The flexible substrate includes but is not limited to polyimide, polyethylene terephthalate or polydimethylsiloxane.

[0021] The right leg drive circuit (RLD) electrode or the reference electrode (REF) of the auxiliary electrode unit of the electrode group on the bioelectric sampling electrode plate is connected to each split electrode group to reduce the noise of the electromyographic signals collected from different parts.

[0022] The electrodes in the bioelectric sampling electrode plate are connected to the signal processing module directly or through a connection socket, and a multiplexer (MUX) connects all the electrodes to the signal processing module.

[0023] The multiplexer (MUX) combines the signals of the electrode group into multiple channels of the wireless main control module to realize the collection of electromyographic signals of 32 channels or more.

[0024] The bioelectric sampling electrode plate adopts a serpentine wiring design.

[0025] The wireless main control module includes a microcontroller (SOC) with integrated radio frequency circuit, a bioelectric analog front end (AFE) and an inertial sensor (IMU).

[0026] In view of the defects existing in the background technology, the beneficial effects of the present invention include:

[0027] 1) Comprehensive muscle activity information: The present invention can obtain the user's electromyographic data from more channels, which can improve the measurement accuracy and efficiency of the equipment and provide important value for rehabilitation training, sports training and disease treatment.

[0028] 2) High ease of use: The present invention ensures that the device can be aligned with the optimal sampling point of the electromyographic signal through the redundant electrode design distributed in an array, so as to collect high-quality electromyographic signals. That is, it can be worn by ordinary users without the need for special guidance, and can measure electromyographic signals conveniently, easily and accurately.

[0029] 3) User-friendly design: The device adopts a stretchable serpentine cable design, which provides good extensibility in the horizontal and vertical directions. This two-way extensibility enables the device to better adapt to the user's muscles of different shapes and sizes, thereby providing better fit and comfort.

[0030] 4) Higher spatial resolution of myoelectric signals: For the electrode group, each group of differential electrodes constitutes a channel. The electrode group of the array bioelectric sampling electrode module improves the longitudinal spatial resolution along the muscle fiber direction by increasing the sampling electrode channels and compressing the spacing and electrode size between electrodes; in the direction perpendicular to the muscle fiber, the lateral spatial resolution can be effectively improved by making the electrodes as close to each other as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1This is a schematic diagram of wearing a single electrode group on the bioelectric sampling electrode plate of the utility model along the direction of muscle fibers;

[0032] Figure 2 It is a schematic diagram of wearing multiple electrode groups on the bioelectric sampling electrode plate of the utility model along the direction of muscle fibers;

[0033] Figure 3 It is a schematic diagram of a plurality of electrode groups on the bioelectric sampling electrode plate of the utility model covering or being worn on a part along the muscle fiber direction;

[0034] Figure 4 This is a schematic diagram of the electrode serpentine routing of the bioelectric sampling electrode plate described in the utility model;

[0035] Figure 5 This is a schematic diagram of the spatial arrangement of the bioelectric sampling electrode plate of the utility model;

[0036] Figure 6 It is a schematic diagram of the arrangement of electrode units of an electrode group in the array-type bioelectric sampling electrode module of the utility model;

[0037] Figure 7 It is a schematic diagram of the signal collection effect of the electromyographic sampling signal aligned with the optimal sampling point in the utility model and the traditional electromyographic sampling device which has the problem of not aligning with the optimal sampling point. DETAILED DESCRIPTION

[0038] The following will be described in detail in conjunction with the drawings of the present utility model so that the present utility model can be better understood. The following specific implementation is only an explanation of an embodiment of the present utility model and does not constitute a limitation on the claims of the present utility model.

[0039] The utility model discloses an array-type multi-channel electromyographic signal measurement system.

[0040] The array-type multi-channel electromyographic signal measurement system includes a bioelectric sampling electrode plate, a signal processing module and a wireless main control module;

[0041] The bioelectric sampling electrode plate is connected to the signal processing module, and the signal processing module is connected to the wireless main control module;

[0042] The bioelectric sampling electrode plate sensing unit measures the original electromyographic signal, which is processed by the signal processing module. The signal processing module completes the amplification, filtering and other processing of the electromyographic signal, and sends the processed electromyographic signal to the computer through the wireless main control module for analysis and storage.

[0043] In this embodiment, the signal processing module uses the ADS1298 chip. The ADS1298 chip is dedicated to the collection of bioelectric information such as electrocardiogram, electromyography and electroencephalogram. The ADS1298 chip is used to collect and process surface electromyography signals, which has the characteristics of simplified front-end conditioning circuit design, high system integration, small size and low power consumption. It also meets the requirements of multi-channel collection of surface electromyography (sEMG) signals.

[0044] The bioelectric sampling electrode plate is fixed along the direction of muscle fibers when worn to measure the signal of a single muscle or the signals of multiple muscles at the same time.

[0045] The bioelectric sampling electrode plate is fixed to the user's measured part by means of adhesive non-woven fabric.

[0046] Figure 1 What is shown is the wearing method of a single electrode group along the direction of muscle fibers. This wearing method can measure the electromyographic signals of a single muscle or multiple muscles at the same time.

[0047] Figure 2 What is demonstrated is how to wear multiple electrode groups together to measure the electromyographic signals of one or more muscles.

[0048] Figure 3 What is demonstrated is how to wear and use multiple electrode groups together, which can measure the electromyographic signals of multiple muscle blocks or muscle groups in one area.

[0049] The connection between the biopotential sampling electrode plate and the signal processing module adopts a serpentine routing design, which can provide good ductility in the horizontal and vertical directions. This two-way ductility enables the device to better adapt to the user's muscles of different shapes and sizes, thereby providing better fit and comfort.

[0050] The bioelectric sampling electrode plate adopts a serpentine routing method, which can effectively improve the ductility of the bioelectric sampling electrode plate in the horizontal and vertical directions, improve the quality and accuracy of the electromyographic signal, and provide more accurate muscle activity information by effectively reducing signal interference. The double-segment serpentine routing design also helps to use space more effectively. By realizing more electrode arrangements in a limited space, the acquisition range and accuracy of the electromyographic signal can be improved, thereby providing more comprehensive muscle activity information.

[0051] Figure 4 What is shown is a schematic diagram of the serpentine routing design of the biopotential sampling electrode board, which includes both the serpentine routing design of the sampling electrode board itself and the serpentine routing design when connected to other modules.

[0052] The bioelectric sampling electrode plate is a flexible circuit board composed of a flexible substrate and an array-type bioelectric sampling electrode module.

[0053] The flexible substrate of the flexible circuit board is polyimide, and the thickness of the flexible circuit board is 0.12mm.

[0054] like Figure 5 As shown, the array-type biopotential sampling electrode module includes 9 identical electrode groups, which are arranged horizontally with equal spacing between the electrode groups. The 9 electrode groups constitute a biopotential sampling electrode plate that includes an array-type biopotential sampling electrode module. A total of 9 such electrode groups can fully cover the entire measurement area of ​​the user, ensuring coverage of the muscles at the measurement area and ensuring the accuracy and stability of electromyographic signal acquisition.

[0055] Each electrode group contains 9 electrode units, which are the core part of the bioelectric sampling electrode plate. They are responsible for collecting and transmitting electromyographic signals.

[0056] like Figure 6 As shown, the 9 electrode units include 8 sampling electrode units and 1 auxiliary electrode unit. The sampling electrode unit arranges 8 electrodes longitudinally at equal intervals. The 8 sampling electrode units are paired to form bipolar inputs of 4 bioelectric differential sampling channels. This bipolar electrode input can reduce noise and interference, thereby effectively improving the signal quality.

[0057] The auxiliary electrode unit includes a right leg drive circuit (RLD) electrode. The auxiliary electrode unit is arranged longitudinally with the sampling electrode unit in space and maintains a certain distance. The right leg drive circuit (RLD) can further reduce noise and interference, thereby improving the quality of the electromyographic signal.

[0058] Each electrode unit is connected by a wire.

[0059] At the same time, the electrode group of the array bioelectric sampling electrode module increases the sampling electrode channel along the muscle fiber direction, compresses the distance between electrodes and the size of electrodes, and improves the longitudinal spatial resolution. In the direction perpendicular to the muscle fiber, the transverse spatial resolution is effectively improved by bringing the electrode sheets as close as possible.

[0060] The electrode group is connected to the signal processing module through the connector, and the multiplexer (MUX) connects all the electrodes to the ads1298 chip of the signal processing module. The ads1298 chip has 32 channels after being connected through the multiplexer (MUX), and a total of 64 electrodes of the sampling electrode unit.

[0061] The sampling rate of each channel of the ads1298 chip is set to 1000Hz, which means that it can sample each channel 1000 times per second. In the interval between two samples, the multiplexer (MUX) will switch channels at the nanosecond level. The ability of the multiplexer (MUX) to quickly switch between channels enables the microcontroller (SOC) connected to the bioelectric analog front end (AFE) to simultaneously obtain 32 channels of bioelectric data in a single sample. This design achieves the expansion of the number of channels and can obtain bioelectric data from more channels at the same time. In addition, this design can not only improve the measurement accuracy of the device, but also improve the measurement efficiency of the device, thereby reducing the number of connection points required when the main control unit is connected to the bioelectric sampling electrode plate, and using a bioelectric analog front end (AFE) chip with fewer channels to achieve more channels of bioelectric data acquisition.

[0062] After the data processing module collects the electromyographic signal, it completes the amplification, filtering and other processing of the electromyographic signal, and sends the processed electromyographic signal to the computer through the wireless main control module for analysis and storage, ultimately realizing the analysis and application of the electromyographic signal.

[0063] Figure 7 The comparison diagram of the myoelectric signals collected by the array multi-channel myoelectric signal measurement system of the present invention and the traditional myoelectric signal acquisition system is shown in Figure 2. Since the traditional myoelectric signal acquisition equipment often fails to accurately align with the optimal sampling point, the sampling signal quality is poor (e.g. Figure 7-1 As shown in the figure, our invention can still be aligned with the best sampling point when worn by oneself without the guidance of a specialist. The redundant design of the electrodes covers all the parts to be measured, so there is a sampling channel located at the best sampling point, which can collect the signal of the best sampling point. The signal quality collected by aligning with the best sampling point is better (as shown in the figure). Figure 7-2 as shown).

[0064] In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, parameters or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0065] The above describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. An array-type multi-channel electromyographic signal measurement system, the array-type multi-channel electromyographic signal measurement system comprises a bioelectric sampling electrode plate, a signal processing module and a wireless main control module; the bioelectric sampling electrode plate is connected to the signal processing module, and the signal processing module is connected to the wireless main control module; It is characterized in that The bioelectric sampling electrode plate is composed of one or more array-type bioelectric sampling electrode modules; The array-type bioelectric sampling electrode module includes one or more identical electrode groups, each electrode group includes a sampling electrode unit and an auxiliary electrode unit; The sampling electrode unit has an even number of electrodes arranged longitudinally at equal intervals, and the even number of electrodes arranged longitudinally at equal intervals form a plurality of bioelectric differential sampling channels; The auxiliary electrode unit includes one or more electrodes, and the electrode types include one or two of the right leg driving circuit electrode or the reference electrode. The auxiliary electrode unit is arranged longitudinally with the sampling electrode unit in space and keeps a distance; The electrode groups are arranged horizontally at equal intervals, and one or more identical electrode groups form an array-type bioelectric sampling electrode module.

2. The array-type multi-channel electromyographic signal measurement system according to claim 1, characterized in that: The electrodes of the electrode group in the bioelectric sampling electrode plate as a whole cover the effective electromyographic signal collection area of ​​the muscle fibers at the measurement site.

3. The array-type multi-channel electromyographic signal measurement system according to claim 1, characterized in that: The electrode unit of each electrode group on the bioelectric sampling electrode plate is a conductive material, and the electrode unit is combined with a flexible substrate to form a flexible sampling electrode plate.

4. The array-type multi-channel electromyographic signal measurement system according to claim 3, characterized in that: The conductive material of the electrode unit includes gold, copper, silver or graphite.

5. The array-type multi-channel electromyographic signal measurement system according to claim 3, characterized in that: The flexible substrate includes polyimide, polyethylene terephthalate or polydimethylsiloxane.

6. The array-type multi-channel electromyographic signal measurement system according to claim 1, characterized in that: The right leg driving circuit electrode or the reference electrode of the auxiliary electrode unit of the electrode group on the bioelectric sampling electrode plate is connected to each split electrode group to reduce the noise of the electromyographic signals collected from different parts.

7. The array-type multi-channel electromyographic signal measurement system according to claim 1, characterized in that: The electrodes in the bioelectric sampling electrode plate are connected to the signal processing module directly or through a connecting socket, and the multiplexer connects all the electrodes to the signal processing module.

8. The array-type multi-channel electromyographic signal measurement system according to claim 7, characterized in that: The multiplexer combines the signals of the electrode groups into multiple channels of the signal processing module.

9. The array-type multi-channel electromyographic signal measurement system according to claim 1, characterized in that: The bioelectric sampling electrode plate adopts a serpentine wiring design.

10. The array-type multi-channel electromyographic signal measurement system according to claim 1, characterized in that: The wireless main control module includes a microcontroller with integrated radio frequency circuit, a bioelectric simulation front end and an inertial sensor.

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