CN111248908A - Distributed surface electromyographic signal wireless acquisition system with variable channel number - Google Patents
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- 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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- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
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- 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
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- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7225—Details of analog processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation
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Abstract
The invention discloses a distributed surface electromyographic signal wireless acquisition system with variable channel number, which comprises: the wireless acquisition unit comprises a control unit and a wireless acquisition unit. The control unit comprises a shell and a main controller and is used for processing the acquired data. The wireless acquisition unit comprises a shell, an acquisition controller, an electromyographic signal acquisition module, an attitude information acquisition module and a power supply module and is used for acquiring the electromyographic signal and the attitude information of the measured position. The system of the invention can freely set the number of the acquisition units, freely set the distribution of the acquisition units on the tested body, finish the detection and acquisition of the myoelectric signals and postures in multiple modes, get rid of the constraint of wired transmission, and effectively detect the subtle change of the postures of the objects, thereby improving the pertinence of the acquisition of the myoelectric signals and posture data and increasing the flexibility of the acquisition system on the premise of ensuring the acquisition quality.
Description
Technical Field
The invention relates to the technical field of wearing equipment based on electromyographic signals, in particular to a distributed surface electromyographic signal wireless acquisition system with variable channel number.
Background
With the increasing development of scientific technology, portable muscle electric signal acquisition equipment and posture perception equipment are widely used in rehabilitation medicine. The patient wears the equipment to carry out the action training, and the computer judges the action intention of the patient through the acquired information and is used for man-machine interaction so as to improve the effect of rehabilitation training. Most of the existing electromyographic signal acquisition devices are in a wireless ring type or a wired array type. The wireless ring type sensor has the problems that the acquisition frequency is low, and signals cannot be acquired aiming at muscles at different positions, the wired array type sensor has the problems that the acquisition mode is single, and the wired constraint cannot execute large-amplitude actions, the existing sensor has less attitude data information, and the fine change of the actions cannot be detected during rehabilitation training. Moreover, because the number of acquisition channels required by different application occasions is different, when the number of acquisition channels required is increased, the current acquisition device cannot meet the requirements, the acquisition frequency is low, the signal quality is poor, and the subsequent processing and identification are not facilitated.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems, the invention provides a distributed surface electromyogram signal wireless acquisition system with multiple mode states, which can reasonably set the positions of acquisition units and the number of the acquisition units according to specific conditions on the premise of ensuring high-fidelity data acquisition, freely increase and decrease the number of acquisition channels to form multiple modes, and get rid of the constraint of cables, thereby increasing the flexibility of acquisition and improving the quality of acquisition. And the subtle transformation of the whole arm posture is dynamically restored by adding the multi-channel posture data, so that the device has a good expansion effect on the rehabilitation training or other application aspects.
The technical scheme is as follows: in order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
a channel number variable distributed surface electromyographic signal wireless acquisition system comprises: the device comprises a control unit and a wireless acquisition unit. The acquisition system modularizes the wireless acquisition units, is connected with one or more wireless acquisition units through the control unit, and is used for acquiring the electromyographic signals and the attitude data of the detected position and sending the acquired data to the control unit in a wireless transmission mode; therefore, the number of the collected channels can be expanded by increasing the number of the modules, the collection equipment and the collection process are simplified, high-quality signal collection is freely carried out aiming at muscles at a specific position in a wireless networking mode, and the change of the posture of the measured object is more truly restored.
Furthermore, the control unit comprises a first shell, a main controller and a first wireless data transceiver module, wherein the main controller and the first wireless data transceiver module are arranged in the first shell, and the main controller is electrically connected with the first wireless data transceiver module;
the main controller is used for controlling the connection and identification of one or more wireless acquisition units, processing the data received by the first wireless data transceiver module, sending a control instruction through the first wireless data transceiver module, controlling the acquisition modes of the electromyographic signals and the posture information in the wireless acquisition units, and controlling the wireless acquisition units to acquire and transmit the electromyographic and posture data;
the first wireless data transceiver module is used for receiving the signals sent by the wireless acquisition unit and sending the signals to the main controller, and sending the control command issued by the main controller to the wireless acquisition unit.
Furthermore, the main controller selects a DSP, and can complete one multiplication and one addition within one instruction period, so as to control the first wireless data transceiver module to receive data and perform fast filtering through its powerful computing capability.
The first wireless data transceiver module adopts a dual-frequency WIFI module, based on an RTOS operating system, data traversing and distribution can be carried out on the first wireless data transceiver module and the wireless connected sub-modules, the number of the connectable sub-modules is controlled within 20 according to the bandwidth limitation of the first wireless data transceiver module, normal and better data can be obtained, and 2.4G or 5G frequency can be adjusted according to the user-defined condition.
Furthermore, the wireless acquisition unit comprises a second shell, and an acquisition controller, a second wireless data transceiver module, an electromyographic signal acquisition module, an attitude information acquisition module and a power supply module which are arranged in the second shell;
the acquisition controller is electrically connected with the second wireless data transceiver module, the electromyographic signal acquisition module, the attitude information acquisition module and the power supply module respectively;
the acquisition controller is used for collecting and processing data acquired by the electromyographic signal acquisition module and the posture information acquisition module, and sending the data to the control unit for processing and transmission through the second wireless data transceiver module; meanwhile, the system is used for controlling the mode of an acquisition channel and adjusting the acquisition frequency and the data transmission rate;
the electromyographic signal acquisition module is used for acquiring electromyographic signals at corresponding positions; the attitude information acquisition module is used for acquiring attitude information of a measured object at a corresponding position; the second wireless data transceiver module is used for receiving the control instruction sent by the control unit, sending the received control instruction to the acquisition controller and transmitting the data sent by the acquisition controller to the control unit; the power module is used for supplying power to the wireless acquisition unit.
Furthermore, the acquisition controller uses a low-power ARM-MCU, and uses an ADC and a UART peripheral to acquire and transmit data.
Furthermore, the electromyographic signal acquisition module comprises a preceding stage amplification circuit, a power frequency trap circuit, a Butterworth filter circuit and an adjustable multiple amplification circuit, and is used for preprocessing the acquired signals; the electromyographic signal acquisition module further comprises an adsorption type acquisition panel;
the adsorption type acquisition panel is arranged on the outer side of the bottom of the second shell and used for being stuck to the surface of a human body to detect an electromyographic signal;
the pre-stage amplifying circuit is electrically connected with the adsorption type acquisition panel and is used for amplifying the electromyographic signals;
the power frequency trap circuit is electrically connected with the pre-stage amplification circuit and is used for trapping the amplified signals;
the Butterworth filter circuit is electrically connected with the power frequency trap circuit and is used for filtering interference frequency;
the adjustable multiple amplifying circuit is respectively electrically connected with the Butterworth filter circuit and the acquisition controller, is arranged on the outer side of the second shell and is used for adjusting the amplified and filtered electromyographic signals and transmitting the signals to the acquisition controller.
Preferably, the electromyographic signal acquisition module adopts a 100-time pre-stage amplification circuit, a 50Hz power frequency trap circuit and a 20-1000 Hz Butterworth filter circuit, and the amplification factor range of the adjustable factor amplification circuit is 1-150 times.
Further, the attitude information acquisition module comprises an MENS sensor for acquiring attitude data;
the power supply module comprises a 3.7V power supply, a voltage stabilizing circuit and a charging circuit; the 3.7V power supply is respectively and electrically connected with the voltage stabilizing circuit and the charging circuit, and the voltage stabilizing circuit is respectively and electrically connected with the acquisition controller, the electromyographic signal acquisition module, the attitude information acquisition module and the second wireless data transceiver module.
Furthermore, an electrode adsorption device is arranged on the adsorption type acquisition panel and used for conducting myoelectric signals on the surface of a human body and fixing the acquisition position;
the electrode adsorption device has three paths of high-conductivity electrode pastes, and a flexible device is arranged at the joint of the electrode paste and the adsorption type acquisition panel and is used for tightly adhering to skins in different shapes.
Furthermore, the acquisition system also comprises a Type-C interface and a USB interface; the Type-C interface is electrically connected with the power supply module and used for charging the power supply module; the USB interface is electrically connected with the control unit and used for connecting the control unit to external equipment.
Furthermore, the wireless acquisition unit and the control unit respectively comprise at least one control key and one LED, the control key and the LED in the wireless acquisition unit are respectively electrically connected with the acquisition controller, and the control key and the LED in the control unit are respectively electrically connected with the main controller and used for state display and module control.
Has the advantages that: compared with the prior art, the technical scheme of the invention has the following beneficial technical effects:
the invention improves the acquisition frequency, can obtain better signal quality, has rich details and is beneficial to the processing and the identification of subsequent data; the acquisition mode of the invention is upgraded from the existing wired mode to the wireless mode, so that the restriction of the wired mode is eliminated, and the possibility of acquiring various actions is further increased; the acquisition equipment provided by the invention can be upgraded from a fixed channel number to a channel number which can be freely increased and decreased, so that the redundancy degree of data acquisition is reduced, the acquisition pertinence is improved, the flexibility of an acquisition strategy is increased, and the rehabilitation training and scientific research are facilitated. The invention has small volume and light weight, and can be firmly adsorbed on the surface of a human body, thereby increasing the reliability of information acquisition.
Drawings
FIG. 1 is a human body wearing schematic diagram of an electromyographic signal wireless acquisition system according to an embodiment of the invention;
FIG. 2 is a schematic networking diagram of a wireless electromyographic signal acquisition system according to an embodiment of the invention;
FIG. 3 is a structural stump diagram of a wireless electromyographic signal acquisition system according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a control unit of the electromyographic signal wireless acquisition system according to the embodiment of the invention;
FIG. 5 is a schematic structural diagram of a wireless acquisition unit of the electromyographic signal wireless acquisition system according to an embodiment of the invention;
the system comprises a control unit 10, a main controller 11, a first wireless data transceiving module 12, a USB interface 13, a first control key 14, a first shell 15, a wireless acquisition unit 20, an electromyographic signal acquisition module 21, an attitude information acquisition module 22, a second wireless data transceiving module 23, an acquisition controller 24, a power supply module 25, an adsorption Type acquisition panel 26, an amplification factor regulator 27, a Type-C interface 28, an electrode adsorption device 29, a second shell 30, an LED31 and a second control key 32.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The invention relates to a channel number variable distributed surface electromyogram signal wireless acquisition system, as shown in fig. 1 and fig. 2, comprising: a control unit 10 and a wireless acquisition unit 20. The acquisition system modularizes the wireless acquisition unit 20, is connected with one or more wireless acquisition units 20 through the control unit 10, and the wireless acquisition unit 20 is used for acquiring the electromyographic signals and the attitude data of the detected position and sending the acquired data to the control unit 10 in a wireless transmission mode; therefore, the number of the collected channels can be expanded by increasing the number of the modules, the collection equipment and the collection process are simplified, high-quality signal collection is freely carried out aiming at muscles at a specific position in a wireless networking mode, and the change of the posture of the measured object is more truly restored.
The control unit 10 includes a first housing 15, a main controller 11, a first wireless data transceiver module 12, a USB interface 13, and a first control button 14, as shown in fig. 4, the main controller 11 and the first wireless data transceiver module 12 are disposed inside the first housing 15, the main controller 11 is electrically connected to the first wireless data transceiver module 12 and the USB interface 13, the first control button 14 is electrically connected to the main controller 11 for module control, and the USB interface 13 is used for connecting the control unit 10 to an external device.
The main controller 11 is configured to control connection and identification of one or more wireless acquisition units 20, process data received by the first wireless data transceiver module 12, send a control instruction through the first wireless data transceiver module 12, control an acquisition mode of an electromyographic signal and posture information in the wireless acquisition unit 20, and control the wireless acquisition unit 20 to acquire and transmit the electromyographic signal and posture data. The main controller 11 selects a DSP, and can complete one multiplication and one addition within one instruction period, so as to control the first wireless data transceiver module 12 to receive data, and perform fast filtering through its powerful computing capability.
The first wireless data transceiver module 12 is configured to receive a signal sent by the wireless acquisition unit 20 and send the signal to the main controller 11, and send a control command issued by the main controller 11 to the wireless acquisition unit 20. The first wireless data transceiver module 12 is a dual-frequency WIFI module, based on the RTOS operating system, and can traverse and distribute data with wirelessly connected sub-modules, and the number of connectable sub-modules is controlled within 20 according to the bandwidth limitation, so that normal and better data can be obtained, and the 2.4G or 5G frequency can be adjusted according to the user-defined condition.
Fig. 5 is a schematic structural diagram of a wireless acquisition unit, wherein fig. 5(a) is a top view, fig. 5(b) is a front view, fig. 5(c) is a bottom view, fig. 5(d) is a left view, and fig. 5(e) is a half-sectional view.
The wireless acquisition unit 20 includes a second housing 30, and an acquisition controller 24, a second wireless data transceiver module 23, an electromyographic signal acquisition module 21, an attitude information acquisition module 22, and a power supply module 25 which are disposed inside the second housing 30, as shown in fig. 5 (e). As shown in fig. 5(a), the wireless acquisition unit 20 further includes an LED31 and a second control button 32; the LED31 and the second control button 32 are electrically connected to the acquisition controller 24 for status display and module control, respectively.
The acquisition controller 24 is electrically connected with the second wireless data transceiver module 23, the electromyographic signal acquisition module 21, the posture information acquisition module 22 and the power supply module 25 respectively.
The acquisition controller 24 is used for collecting and processing data acquired by the electromyographic signal acquisition module 21 and the posture information acquisition module 22, and sending the data to the control unit 10 for processing and transmission through the second wireless data transceiver module 23; and the method is used for controlling the mode of the acquisition channel, and adjusting the acquisition frequency and the data transmission rate.
The electromyographic signal acquisition module 21 is configured to acquire an electromyographic signal at a corresponding position; the attitude information acquisition module 22 is used for acquiring attitude information of the measured object at the corresponding position; the second wireless data transceiver module 23 is configured to receive a control instruction sent by the control unit 10, send the received control instruction to the acquisition controller 24, and transmit data sent by the acquisition controller 24 to the control unit 10; the power module 25 is used for supplying power to the wireless acquisition unit 20.
The acquisition controller 24 uses a low-power ARM-MCU, and uses its own ADC and UART peripheral to perform data acquisition and transmission.
In this embodiment, the electromyographic signal acquisition module 21 includes a 100-fold pre-stage amplification circuit, a 50Hz power frequency notch circuit, a 20-1000 Hz butterworth filter circuit, and an adjustable multiple amplification circuit, and is configured to pre-process acquired signals; the amplification factor range of the adjustable factor amplification circuit is 1-150 times. As shown in fig. 5(b), the adjustable magnification circuit in this embodiment is a magnification adjuster 27, and is disposed outside the second housing 30.
The electromyographic signal acquisition module 21 further includes an adsorption type acquisition panel 26, the adsorption type acquisition panel 26 is disposed on the outer side of the bottom of the second casing 30, as shown in fig. 5(c), the adsorption type acquisition panel 26 is provided with an electrode adsorption device 29, and the electrode adsorption device is adhered to the surface of a human body, and is used for conducting electromyographic signals on the surface of the human body, fixing the acquisition position and detecting the electromyographic signals. The electrode adsorption device 29 has three paths of high-conductivity electrode pastes, and a flexible device is arranged at the joint of the electrode paste and the adsorption type acquisition panel 26 and is used for tightly adhering to skins with different shapes.
The 100-time preceding stage amplifying circuit is electrically connected with the adsorption type acquisition panel 26 and is used for amplifying the electromyographic signals; the 50Hz power frequency trap circuit is electrically connected with the 100-time pre-stage amplifying circuit and is used for trapping the amplified signals; the 20-1000 Hz Butterworth filter circuit is electrically connected with the 50Hz power frequency trap circuit and is used for filtering interference frequencies except for 20-1000 Hz; the adjustable multiple amplifying circuit is electrically connected with the 20-1000 Hz Butterworth filter circuit and the acquisition controller 24 respectively, is arranged on the outer side of the second shell 30, and is used for adjusting the amplified and filtered myoelectric signals and transmitting the myoelectric signals to the acquisition controller 24.
The attitude information acquisition module 22 includes an MENS sensor for acquiring attitude data.
The power module 25 comprises a 3.7V power supply, a voltage stabilizing circuit and a charging circuit; the 3.7V power supply is electrically connected with the voltage stabilizing circuit and the charging circuit respectively, and the voltage stabilizing circuit is electrically connected with the acquisition controller 24, the electromyographic signal acquisition module 21, the posture information acquisition module 22 and the second wireless data transceiver module 23 respectively. As shown in fig. 5(d), the collection system further includes a Type-C interface 28, and the Type-C interface 28 is electrically connected to the charging circuit of the power module 25 for charging the power module 25.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A wireless acquisition system of distributed surface electromyographic signals with variable channel numbers is characterized in that: the acquisition system comprises a control unit and a wireless acquisition unit; the control unit is connected with one or more wireless acquisition units, and the wireless acquisition units transmit acquired data to the control unit in a wireless transmission mode;
the wireless acquisition unit is used for acquiring myoelectric signals and posture data of the measured position, and acquiring signals of muscles at specific positions in a wireless networking mode to restore the change of the posture of the measured object.
2. The wireless acquisition system of the distributed surface electromyogram signal with the variable channel number according to claim 1, characterized in that: the control unit comprises a first shell, a main controller and a first wireless data transceiver module, wherein the main controller and the first wireless data transceiver module are arranged in the first shell, and the main controller is electrically connected with the first wireless data transceiver module;
the main controller is used for controlling the connection and identification of one or more wireless acquisition units, processing the data received by the first wireless data transceiver module, sending a control instruction through the first wireless data transceiver module, controlling the acquisition modes of the electromyographic signals and the posture information in the wireless acquisition units, and controlling the wireless acquisition units to acquire and transmit the electromyographic and posture data;
the first wireless data transceiver module is used for receiving the signals sent by the wireless acquisition unit and sending the signals to the main controller, and sending the control command issued by the main controller to the wireless acquisition unit.
3. The wireless acquisition system of the distributed surface electromyogram signal with the variable channel number according to claim 2, characterized in that: the main controller selects a DSP, and the first wireless data transceiver module selects a dual-frequency WIFI module based on an RTOS operating system.
4. The wireless acquisition system of the distributed surface electromyogram signal with the variable channel number according to claim 1, characterized in that: the wireless acquisition unit comprises a second shell, and an acquisition controller, a second wireless data transceiver module, an electromyographic signal acquisition module, an attitude information acquisition module and a power supply module which are arranged in the second shell;
the acquisition controller is electrically connected with the second wireless data transceiver module, the electromyographic signal acquisition module, the attitude information acquisition module and the power supply module respectively;
the acquisition controller is used for collecting and processing data acquired by the electromyographic signal acquisition module and the posture information acquisition module, and sending the data to the control unit for processing and transmission through the second wireless data transceiver module; meanwhile, the system is used for controlling the mode of an acquisition channel and adjusting the acquisition frequency and the data transmission rate;
the electromyographic signal acquisition module is used for acquiring electromyographic signals at corresponding positions; the attitude information acquisition module is used for acquiring attitude information of a measured object at a corresponding position; the second wireless data transceiver module is used for receiving the control instruction sent by the control unit, sending the received control instruction to the acquisition controller and transmitting the data sent by the acquisition controller to the control unit; the power module is used for supplying power to the wireless acquisition unit.
5. The wireless acquisition system of the distributed surface electromyogram signal with the variable channel number according to claim 4, characterized in that: the acquisition controller uses an ARM-MCU, and uses an ADC and a UART peripheral to acquire and transmit data.
6. The wireless acquisition system of the distributed surface electromyogram signal with the variable channel number according to claim 4, characterized in that: the electromyographic signal acquisition module comprises a preceding stage amplification circuit, a power frequency trap circuit, a Butterworth filter circuit, an adjustable multiple amplification circuit and an adsorption acquisition panel;
the adsorption type acquisition panel is arranged on the outer side of the bottom of the second shell and used for being stuck to the surface of a human body to detect an electromyographic signal;
the pre-stage amplifying circuit is electrically connected with the adsorption type acquisition panel and is used for amplifying the electromyographic signals;
the power frequency trap circuit is electrically connected with the pre-stage amplification circuit and is used for trapping the amplified signals;
the Butterworth filter circuit is electrically connected with the power frequency trap circuit and is used for filtering interference frequency;
the adjustable multiple amplifying circuit is respectively electrically connected with the Butterworth filter circuit and the acquisition controller, is arranged on the outer side of the second shell and is used for adjusting the amplified and filtered electromyographic signals and transmitting the signals to the acquisition controller.
7. The wireless acquisition system of the distributed surface electromyogram signal with the variable channel number according to any one of claims 4 to 6, characterized in that: the attitude information acquisition module comprises an MENS sensor and is used for acquiring attitude data;
the power supply module comprises a 3.7V power supply, a voltage stabilizing circuit and a charging circuit; the 3.7V power supply is respectively and electrically connected with the voltage stabilizing circuit and the charging circuit, and the voltage stabilizing circuit is respectively and electrically connected with the acquisition controller, the electromyographic signal acquisition module, the attitude information acquisition module and the second wireless data transceiver module.
8. The wireless acquisition system of the distributed surface electromyogram signal with the variable channel number according to claim 6, characterized in that: the adsorption type acquisition panel is provided with an electrode adsorption device, and the electrode adsorption device is used for conducting myoelectric signals on the surface of a human body and fixing the acquisition position;
the electrode adsorption device has three paths of electrode pastes, and a flexible device is arranged at the joint of the electrode paste and the adsorption type acquisition panel and is used for tightly adhering to skins in different shapes.
9. The wireless acquisition system of the distributed surface electromyogram signal with the variable channel number according to any one of claims 4 to 6, characterized in that: the acquisition system also comprises a Type-C interface and a USB interface; the Type-C interface is electrically connected with the power supply module and used for charging the power supply module; the USB interface is electrically connected with the control unit and used for connecting the control unit to external equipment.
10. The wireless acquisition system of the distributed surface electromyogram signal with the variable channel number according to claim 1, characterized in that: the wireless acquisition unit and the control unit respectively comprise at least one control key and one LED, the control key and the LED in the wireless acquisition unit are electrically connected with the acquisition controller respectively, and the control key and the LED in the control unit are electrically connected with the main controller respectively and are used for state display and module control.
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| CN112220483A (en) * | 2020-09-14 | 2021-01-15 | 中国矿业大学 | Flexible dot-matrix type electromyographic signal wireless acquisition system with hot-plug channel |
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