CN114795254A - Heterogeneous surface myoelectricity acquisition device - Google Patents
Heterogeneous surface myoelectricity acquisition device Download PDFInfo
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- CN114795254A CN114795254A CN202210589414.7A CN202210589414A CN114795254A CN 114795254 A CN114795254 A CN 114795254A CN 202210589414 A CN202210589414 A CN 202210589414A CN 114795254 A CN114795254 A CN 114795254A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/389—Electromyography [EMG]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0002—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network
- A61B5/0004—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network characterised by the type of physiological signal transmitted
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
- A61B2560/02—Operational features
- A61B2560/0204—Operational features of power management
- A61B2560/0214—Operational features of power management of power generation or supply
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Abstract
The invention discloses a heterogeneous surface myoelectricity acquisition device, and relates to the technical field of human-computer interaction. The myoelectricity collecting device comprises a high-density myoelectricity collecting module and a distributed myoelectricity collecting module. The different types of acquisition modules are connected in different daisy chains and communicate with the main control by using different SPIs, so that different configurations and relatively independent communication are realized. The high-density electromyography acquisition module is connected with the high-density electrode plate in a single-end input mode to acquire high-density electromyography signals, the distributed electromyography acquisition module is connected with the wet electrode in a differential input mode to acquire distributed electromyography signals, synchronous acquisition of the high-density electromyography signals and the distributed electromyography signals is achieved, and different combinations of electromyography signals can be selected according to specific requirements and experimental requirements. The acquisition modules can be plugged and unplugged, expandability is realized through the modular design of the interfaces and the acquisition modules, the problem of high replacement cost when problems occur can be solved, and only the smallest acquisition module needs to be replaced.
Description
Technical Field
The invention relates to the technical field of human-computer interaction, in particular to a heterogeneous surface myoelectricity acquisition device.
Background
Surface electromyogram (sEMG) is a bioelectric signal recorded from the surface of a muscle through electrodes during the activity of the neuromuscular system. Motor intention signals of the cerebral cortex are conducted through the motor neurons of the spinal cord to the muscle fibers connected to axon terminals. Then the muscle fibers produce potential changes to cause muscle contraction and generate an electric current field on the surface of the human soft tissue and skin, and the potential difference detected in the electric current field is called myoelectric signals.
The sEMG amplitude is about 0-5mV, the main frequency band is 20-500Hz, most of the frequency band is 50-150Hz, the frequency band is obviously weakened above 300Hz, and the signal has poor stability and strong randomness. Although the spatial resolution of the signal is not as high as that of the traditional needle type electromyogram, the signal has better repeatability and larger detection space. It has been found in a number of studies that surface electromyographic signals are derived from electrophysiological activity of the spinal cord alpha motor neuron, which is controlled by the cerebral motor cortex. The frequency and amplitude of the generated electromyographic signals are affected by physiological factors and measurement factors, the physiological factors mainly include: the muscle functional state and activity level are different, so that the muscle fiber recruitment mode and the motor unit synchronization activity are different; the measurement factors mainly include: muscle length, skin temperature, muscle contraction pattern, signal string and electrode position, etc. Under the standard operation, the quantitative analysis is carried out on the collected surface electromyographic signals, so that a researcher can master a series of problems which are widely concerned by modern scientists, such as the muscle activation mode, the muscle fatigue degree, the muscle strength, the coordination of multiple muscle groups, the transmission speed of motor units to excitation and the like, and the quantitative analysis has extremely important research significance and application value for multiple disciplines of rehabilitation medicine, sports science, basic medicine and the like. In the 60 s of the 20 th century, people are gradually mature in detection and processing means of surface electromyographic signals, and the application range of the detection and processing means is wider and wider, and the detection and processing means is mainly embodied in aspects of clinical diagnosis, intelligent artificial limb control, functional electrical stimulation and biofeedback research, sports science research and the like.
Currently, the existing surface myoelectricity collection devices are mainly divided into two types: high density flesh electricity collection equipment and distributed flesh electricity collection equipment. The high-density electromyographic signal acquisition device simultaneously acquires high-density electromyographic signals of a plurality of channels through the high-density electrode plates, and the distributed electromyographic signal acquisition device acquires the distributed electromyographic signals of the channels through a plurality of wet electrodes. However, the existing myoelectricity collection device cannot collect high-density myoelectricity and distributed myoelectricity at the same time, cannot realize the expansion of the myoelectricity collection module, and has high cost.
Therefore, those skilled in the art have been devoted to developing a heterogeneous surface electromyography acquisition device. The myoelectricity collecting module can collect high-density myoelectricity and distributed myoelectricity signals at the same time, can realize the expansion of the myoelectricity collecting module, and reduces the cost of the myoelectricity collecting equipment.
Disclosure of Invention
In view of the above defects in the prior art, the technical problem to be solved by the invention is to simultaneously acquire high-density electromyographic signals and distributed electromyographic signals, so as to realize the expansion of the electromyographic acquisition module and reduce the cost of electromyographic acquisition equipment.
In order to achieve the aim, the invention provides a heterogeneous surface myoelectricity acquisition device which comprises a high-density myoelectricity acquisition module and a distributed myoelectricity acquisition module;
the high-density electromyographic signal acquisition module is connected with the high-density electrode plate in a single-end input mode to acquire high-density electromyographic signals;
the distributed electromyography acquisition module is connected with the wet electrode in a differential input mode to acquire distributed electromyography signals.
Further, the high-density myoelectricity acquisition module and the distributed myoelectricity acquisition module are connected in different daisy chains and communicate with the main control module by using different SPIs.
Furthermore, the high-density myoelectricity acquisition module is eight channels.
Furthermore, the distributed myoelectricity acquisition module is eight channels.
Furthermore, the high-density myoelectricity acquisition module can be plugged.
Furthermore, the distributed myoelectricity acquisition module can be plugged.
Furthermore, the high-density myoelectricity acquisition module is connected with the main control module through a golden finger.
Furthermore, the distributed myoelectricity acquisition module is connected with the main control module through a golden finger.
Furthermore, the high-density myoelectricity acquisition module is connected with the power management module through a golden finger.
Furthermore, the distributed myoelectricity acquisition module is connected with the power management module through a golden finger.
In a preferred embodiment of the invention, two different acquisition modules are designed: high density flesh electricity collection module and distributed flesh electricity collection module. Each module is eight passageways, and different types of collection module are connected with different daisy chains and use different SPI to communicate with the master control, realize different configurations and relatively independent communication. The high-density electromyography acquisition module is connected with the high-density electrode plate in a single-end input mode to acquire high-density electromyography signals, the distributed electromyography acquisition module is connected with the wet electrode in a differential input mode to acquire distributed electromyography signals, synchronous acquisition of the high-density electromyography signals and the distributed electromyography signals is achieved, and different combinations of electromyography signals can be selected according to specific requirements and experimental requirements. Each acquisition module can acquire the myoelectric signals of eight channels at most and is connected with the power management module and the main control module through a golden finger, the acquisition modules can be plugged and pulled out, expandability is realized through the modular design of a plurality of interfaces and the acquisition modules, the problem of high replacement cost when problems occur can be solved, and only the smallest acquisition module needs to be replaced.
Compared with the prior art, the invention has the following obvious substantive characteristics and obvious advantages:
1. two kinds of acquisition modules, a high-density myoelectricity acquisition module and a distributed myoelectricity acquisition module are designed, so that the simultaneous acquisition of high-density myoelectricity and distributed myoelectricity is realized. At least 128-channel high-density electromyogram signals and 8-channel distributed electromyogram signals can be simultaneously collected at the frequency of 1 KHz.
2. And (4) the expansion is realized. The number of myoelectricity acquisition channels can be expanded. The acquisition module uses eight passageways as one piece, and the accessible increases acquisition module quantity and expands the passageway quantity.
3. The cost is low. Only the problematic acquisition module needs to be replaced.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
Fig. 1 is a schematic block diagram of a heterogeneous electromyography acquisition system according to a preferred embodiment of the present invention;
FIG. 2 is a reference voltage circuit in accordance with a preferred embodiment of the present invention;
fig. 3 is a right leg driving circuit according to a preferred embodiment of the present invention.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.
In the preferred embodiment of the invention, the heterogeneous surface myoelectricity acquisition device mainly has the functions of synchronously acquiring and preprocessing high-density surface myoelectricity and distributed surface myoelectricity of a human body and transmitting the acquired and preprocessed high-density surface myoelectricity to the software of an upper computer.
As shown in fig. 1, the acquisition system may be divided into a power management module, a main control module, a data transmission module, a high-density myoelectric acquisition module, and a distributed myoelectric acquisition module.
The power management module needs to supply power to the main control module, the data transmission module, the high-density myoelectricity acquisition module and the distributed myoelectricity acquisition module, and needs to generate five voltage values of 5V, 3.3V, +2.5V and-2.5V, GND, wherein high-frequency noise can be introduced due to the fact that an analog circuit and a digital circuit are involved, and high-speed communication (SPI and RMII) is involved in the digital circuit, so that the analog circuit needs to be isolated from the digital circuit to prevent analog signals from being polluted.
The main control module needs to complete the following functions: 1) controlling the whole equipment; 2) and communicating with the upper computer. The whole device collects at least 128-channel high-density myoelectricity and 8-channel distributed myoelectricity, the sampling frequency of 1KHz and the data precision of 24 bits, the data communication is completed according to the calculation of (1), and the transmission speed is at least 3.264 Mbps.
136×1000×24＝3264000bps＝3.264Mbps (1)
All data is pre-processed and packed, and 136000 int-type data need to be processed per second according to the calculation of (2). If a digital filter needs to be implemented on the MCU, a large number of Floating Point operations are required, and the CPU needs at least 16 clock cycles to compute a Floating Point once, which greatly reduces the operating efficiency.
1000×136＝136000 (2)
And finally, selecting the STM32H743 as a main control chip, communicating with the data transmission module through RMII, and controlling the data acquisition module through a plurality of groups of SPI to finish acquisition, processing and transmission of the electromyographic signals.
The data transmission module needs to transmit at least 400 bytes of data within 1ms, the time occupied by data acquisition, preprocessing and packaging is removed, transmission work needs to be completed within 300us, the transmission speed of at least 10.88Mbps is calculated according to (3), retransmission is carried out when check bits and errors occur, a faster transmission speed is needed, the task cannot be completed by using Bluetooth, WIFI and the like, and finally a fast Ethernet chip LAN8720A supporting 100M communication speed is selected. When the chip is used, the built protocol can be polled once after a period of time to check the current network connection state, so that the STM32 operation resource is completely occupied, and other communication and operation cannot be performed. In order to avoid the situation, the uC/OS-II operating system is used for ensuring the real-time performance and the safety of the system.
136×3333×24＝3264000bps＝10.88Mbps (3)
The high-density electromyography acquisition modules are connected in a daisy chain mode by using an ADS1299 chip, are communicated with the main control module through an SPI (serial peripheral interface), and adopt a single-ended input mode to lead out the cathodes of the high-density electromyography acquisition modules, gather the cathodes to a high-density electrode interface to be connected with a high-density electrode, and share the anode to be connected with a right leg driving circuit and lead out the electrode to be connected with skin so as to avoid saturation of an instrument amplifier for amplifying electric signals caused by the acquired bioelectricity signals, and access the skin after the electromyography data of all channels on the skin are overlapped so as to inhibit common-mode interference. However, such a use also causes problems. A more serious problem is that if the peripheral circuit is not designed to match the skin impedance of the user well, this part of the circuit will not only have the effect of suppressing common mode interference, but will introduce unwanted noise, thereby affecting the signal quality. Another is that using the built-in BIAS circuit of ADS1299 results in increased circuit power consumption. Therefore, two circuits are designed to meet the requirements of different users, and the other circuit (reference voltage circuit, as shown in fig. 2) uses a voltage follower to generate 0V which is not interfered by the outside world and is connected to the skin, so as to avoid that the acquired bioelectric signal causes the instrument amplifier for amplifying the electric signal to be saturated.
The distributed myoelectricity collection module is connected in a daisy chain mode by using an ADS1299 chip, is communicated with the main control module through the SPI, adopts a differential input mode, leads out the positive electrode and the negative electrode of the distributed myoelectricity collection module, is connected with the wet electrode through an earphone interface, and shares a right leg driving circuit with the high-density myoelectricity collection module, as shown in fig. 3.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. The heterogeneous surface electromyography acquisition device is characterized by comprising a high-density electromyography acquisition module and a distributed electromyography acquisition module;
the high-density electromyographic signal acquisition module is connected with the high-density electrode plate in a single-end input mode to acquire high-density electromyographic signals;
the distributed electromyography acquisition module is connected with the wet electrode in a differential input mode to acquire distributed electromyography signals.
2. The heterogeneous surface electromyography acquisition device of claim 1, wherein the high-density electromyography acquisition module and the distributed electromyography acquisition module are connected in different daisy chains and communicate with the master control module using different SPIs.
3. The heterogeneous surface electromyography acquisition device of claim 1, wherein the high-density electromyography acquisition module is eight channels.
4. The heterogeneous surface electromyography acquisition device of claim 1, wherein the distributed electromyography acquisition module is eight channels.
5. The heterogeneous surface electromyography acquisition device of claim 1, wherein the high-density electromyography acquisition module is pluggable.
6. The heterogeneous surface electromyography acquisition device of claim 1, wherein the distributed electromyography acquisition module is pluggable.
7. The heterogeneous surface electromyography acquisition device of claim 2, wherein the high-density electromyography acquisition module is connected to the master control module through a gold finger.
8. The heterogeneous surface electromyography acquisition device of claim 2, wherein the distributed electromyography acquisition module is connected to the master control module via a gold finger.
9. The heterogeneous surface electromyography acquisition device of claim 1, wherein the high-density electromyography acquisition module is connected to the power management module through a gold finger.
10. The heterogeneous surface electromyography acquisition device of claim 1, wherein the distributed electromyography acquisition module is connected to the power management module through a gold finger.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210589414.7A CN114795254A (en) | 2022-05-26 | 2022-05-26 | Heterogeneous surface myoelectricity acquisition device |
| PCT/CN2023/096424 WO2023227086A1 (en) | 2022-05-26 | 2023-05-26 | Heterogeneous surface electromyography acquisition apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210589414.7A CN114795254A (en) | 2022-05-26 | 2022-05-26 | Heterogeneous surface myoelectricity acquisition device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023227086A1 (en) * | 2022-05-26 | 2023-11-30 | 哈尔滨工业大学（深圳） | Heterogeneous surface electromyography acquisition apparatus |
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| US20110015503A1 (en) * | 2009-07-17 | 2011-01-20 | WAVi | Medical apparatus for collecting patient electroencephalogram (eeg) data |
| ITTO20111024A1 (en) * | 2011-11-08 | 2013-05-09 | Bitron Spa | MEASUREMENT DEVICE FOR HIGH-RESOLUTION ELECTROMYOGRAPHIC SIGNALS AND HIGH NUMBER OF CHANNELS. |
| CN103393420B (en) * | 2013-07-30 | 2015-06-17 | 中国科学技术大学 | High-density active flexible electrode array and signal conditioning circuit thereof |
| CN114795254A (en) * | 2022-05-26 | 2022-07-29 | 哈尔滨工业大学（深圳） | Heterogeneous surface myoelectricity acquisition device |
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| WO2023227086A1 (en) * | 2022-05-26 | 2023-11-30 | 哈尔滨工业大学（深圳） | Heterogeneous surface electromyography acquisition apparatus |
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Inventor after: Liu Honghai Inventor after: Chang Hui Inventor after: Yang Hongyu Inventor after: Liu Yifan Inventor before: Liu Honghai Inventor before: Yang Hongyu Inventor before: Chang Hui Inventor before: Liu Yifan |