Anti-interference circuit and system for acquiring electromyographic signal data
By designing an anti-interference circuit including signal acquisition module, filter module, voltage follow module, resistive-capacitance coupling module and drive module, the problem of external interference in electromyography signal data acquisition is solved, and more accurate data acquisition is achieved.
Patent Information
- Application Number
- CN202421872075.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-01
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-08-01
AI Technical Summary
When collecting electromyography signal data, external interference is easily introduced, resulting in inaccurate data collection.
An anti-interference circuit including a signal acquisition module, a filter module, a voltage follow module, a resistive-capacitance coupling module and a driving module is designed to reduce external interference and improve the accuracy of data acquisition by filtering, increasing the input impedance and suppressing zero-point drift.
Effectively filter out interference signals, enhance the stability of electromyography signals, reduce external interference, and improve the accuracy of data acquisition.
Smart Images
Figure CN222897248U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical equipment, and in particular to an anti-interference circuit and system for collecting electromyographic signal data. Background Art
[0002] Motor evoked potential (MEP) is a non-invasive detection method in the clinical medical technology of transcranial magnetic stimulation (TMS). TMS induces induced current in the skull through a stimulation coil. When it acts on the motor cortex to a certain intensity, MEP can be recorded in the contralateral target muscle. Relevant studies have shown that the amplitude of TMS-induced MEP can reflect changes in cortical excitability, and the MEP latency can determine the conduction function of the corticospinal tract.
[0003] However, when collecting electromyographic signal data, it is easy to introduce external interference, resulting in inaccurate data collection. Utility Model Content
[0004] The utility model aims to solve the technical problems existing in the background technology and proposes an anti-interference circuit for collecting electromyographic signal data.
[0005] In order to achieve the above technical objectives, the technical solution adopted by the utility model in the first aspect is as follows:
[0006] The invention discloses an anti-interference circuit for collecting electromyographic signal data, comprising a signal collection module, a filtering module, a voltage following module, a resistor-capacitor coupling module and a driving module. The signal collection module is used for collecting electromyographic signals. The filtering module is electrically connected to the signal collection module to filter out interference signals. The voltage following module is electrically connected to the filtering module to receive electromyographic signals. The voltage following module is used for increasing input impedance. The resistor-capacitor coupling module is electrically connected to the voltage following module to isolate the DC voltage in the circuit. The resistor-capacitor coupling module comprises a common-mode reference potential point. The driving module is electrically connected to the filtering module and the common-mode reference potential point respectively to offset the common-mode interference signal.
[0007] Preferably, the signal acquisition module includes a recording electrode unit, a reference electrode unit and a ground electrode unit.
[0008] Preferably, the filtering module includes a first filtering unit and a second filtering unit, the first filtering unit includes an inductor L1, a capacitor C1 and a capacitor C2, the input end of the inductor L1 is electrically connected to the capacitor C1 and the recording electrode unit, respectively, the output end of the inductor L1 is electrically connected to the capacitor C2 and the voltage follower module, respectively, the capacitor C1 and the capacitor C2 are grounded, respectively, the second filtering unit includes an inductor L2, a capacitor C3 and a capacitor C4, the input end of the inductor L2 is electrically connected to the capacitor C3 and the reference electrode unit, respectively, the output end of the inductor L2 is electrically connected to the capacitor C4 and the voltage follower module, respectively, the capacitor C3 and the capacitor C4 are grounded, respectively.
[0009] Preferably, the voltage follower module includes a voltage follower U1, an input resistor R1, an input resistor R2, a feedback resistor R3 and a feedback resistor R4, the two ends of the input resistor R1 are respectively electrically connected to the first positive input terminal pin of the voltage follower U1 and the output end of the inductor L1, the two ends of the input resistor R2 are respectively electrically connected to the second positive input terminal pin of the voltage follower U1 and the output end of the inductor L2, the two ends of the feedback resistor R3 are respectively electrically connected to the first output terminal pin and the first reverse input terminal pin of the voltage follower U1, the two ends of the feedback resistor R4 are respectively electrically connected to the second output terminal pin and the second reverse input terminal pin of the voltage follower U1, and the first output terminal pin and the second output terminal are respectively electrically connected to the resistor-capacitor coupling module.
[0010] Preferably, the RC coupling module includes a capacitor C5, a capacitor C6, a resistor R5 and a resistor R6, the first end of the capacitor C5 is electrically connected to the first reverse input terminal, the second end of the capacitor C5 is electrically connected to the resistor R5 and serves as an output pin, the second end of the capacitor C6 is electrically connected to the resistor R6 and serves as an output pin, the resistor R5 and the resistor R6 are connected in series, and the common-mode reference potential point is set between the resistor R5 and the resistor R6.
[0011] Preferably, the filtering module also includes a third filtering unit, which includes an inductor L3, a capacitor C7 and a capacitor C8, the input end of the inductor L3 is electrically connected to the capacitor C7 and the ground electrode unit respectively, the output end of the inductor L3 is electrically connected to the capacitor C8 and the driving module respectively, and the capacitor C7 and the capacitor C8 are grounded respectively.
[0012] Preferably, the driving module includes a reverse amplifier U2, a resistor R7, a resistor R9 and a feedback resistor R8, the two ends of the resistor R7 are electrically connected to the output end of the inductor L3 and the third output end of the reverse amplifier U2, respectively, the two ends of the feedback resistor R8 are electrically connected to the third reverse input end and the third output end of the reverse amplifier U2, respectively, the first end of the resistor R9 is electrically connected to the fourth reverse input end and the fourth output end of the reverse amplifier U2, respectively, and the second end of the resistor R9 is electrically connected to the third reverse input end.
[0013] Preferably, the fourth positive input terminal pin and the third positive input terminal pin of the reverse amplifier U2 are electrically connected to the common mode reference potential point respectively.
[0014] The utility model proposes in a second aspect a circuit system for collecting electromyographic signal data with anti-interference, comprising a TMS device and a MEP device connected to each other, the TMS device comprising two electromyographic signal collection parts, a differential signal amplifying part, an AD collection part, a data processing part and a communication part; the electromyographic signal collection part comprises an anti-interference circuit for collecting electromyographic signal data as in any one of the above schemes, the electromyographic signal collection part is used to collect clean electromyographic signals, the differential signal amplifying part is respectively connected to the two electromyographic signal collection parts to amplify and process the received electromyographic signals and obtain two amplified electromyographic signals respectively, the AD collection part is respectively connected to the differential signal amplifying part and the data processing part, the AD collection part transmits the two amplified electromyographic signals to the data processing part for processing, and the communication part transmits the processed two amplified electromyographic signals to the MEP device for display.
[0015] Compared with the prior art, the utility model has the following beneficial technical effects: it includes a signal acquisition module, a filter module, a voltage following module, a resistor-capacitor coupling module and a drive module, the signal acquisition module is used to collect electromyographic signals, the filter module is electrically connected to the signal acquisition module to filter out interference signals, the voltage following module is electrically connected to the filter module to receive electromyographic signals, the voltage following module is used to increase input impedance, the resistor-capacitor coupling module is electrically connected to the voltage following module to isolate the DC voltage in the circuit, the resistor-capacitor coupling module includes a common-mode reference potential point, and the drive module is electrically connected to the filter module and the common-mode reference potential point respectively to offset common-mode interference signals, thereby filtering electromyographic signals, increasing input impedance and suppressing zero drift, reducing external interference, and enhancing the accuracy of data acquisition. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of an embodiment of the first aspect of the utility model;
[0017] Figure 2 It is a schematic structural diagram of an embodiment of the second aspect of the utility model.
[0018] Figure numbers: 100TMS device, 101 electromyography acquisition unit, 102 differential signal amplification unit, 103AD acquisition unit, 104 data processing unit, 105 communication unit, 200MEP device, 3011 recording electrode unit, 3012 reference electrode unit, 3013 ground electrode unit, 3021 first filtering unit, 3022 second filtering unit, 3023 third filtering unit, 303 voltage follower module, 304 resistor-capacitor coupling module, 305 driving module.
[0019] The pins of voltage follower U1 correspond to:
[0020] Pin 1: The first output pin
[0021] Pin 2: First reverse input pin
[0022] Pin 3: First positive input pin
[0023] Pin 5: Second positive input pin
[0024] Pin 6: Second reverse input pin
[0025] Pin 7: Second output pin
[0026] The pins of the reverse amplifier U2 correspond to:
[0027] Pin 1: The fourth output pin
[0028] Pin 2: Fourth reverse input pin
[0029] Pin 3: Fourth positive input pin
[0030] Pin 5: The third positive input pin
[0031] Pin 6: The third reverse input pin
[0032] Pin 7: The third output pin DETAILED DESCRIPTION
[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0034] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.
[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or a specific connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.
[0036] The specific embodiments of the present utility model are described in detail below with reference to the accompanying drawings.
[0037] like Figure 1 As shown, the utility model proposes an anti-interference circuit for collecting electromyographic signal data in the first aspect, which includes a signal acquisition module, a filtering module, a voltage following module 303, a resistor-capacitor coupling module 304 and a driving module 305. The signal acquisition module is used to collect electromyographic signals, the filtering module is electrically connected to the signal acquisition module to filter out interference signals, the voltage following module 303 is electrically connected to the filtering module to receive electromyographic signals, the voltage following module 303 is used to increase the input impedance, the resistor-capacitor coupling module 304 is electrically connected to the voltage following module 303 to isolate the DC voltage in the circuit, the resistor-capacitor coupling module 304 includes a common-mode reference potential point, and the driving module 305 is electrically connected to the filtering module and the common-mode reference potential point respectively to offset the common-mode interference signal.
[0038] The specific implementation is as follows: the signal acquisition module includes tools such as electrodes for collecting human electromyographic signals. The electromyographic signals of the human body are collected through such tools, and the collected electromyographic signals are filtered out by the filtering module to obtain clean electromyographic signals. The voltage follower module 303 increases the corresponding input impedance to stably collect these clean electromyographic signals. In order to ensure the stable output of the electromyographic signals, the DC voltage in the circuit is isolated by the resistor-capacitor coupling module 304 to prevent zero point drift, and the common-mode reference potential point provided is used to ensure that the collected electromyographic signals have the same voltage reference point to ensure signal consistency and prevent signal offset. Finally, the common-mode reference potential point is fed back to the human body through the driving module 305, thereby offsetting the common-mode interference signal of the human body, improving the common-mode rejection ratio, and enhancing the amplitude-frequency characteristics.
[0039] Furthermore, the signal acquisition module includes a recording electrode unit 3011 , a reference electrode unit 3012 and a ground electrode unit 3013 .
[0040] The filtering module includes a first filtering unit 3021 and a second filtering unit 3022. The first filtering unit 3021 includes an inductor L1, a capacitor C1 and a capacitor C2. The input end of the inductor L1 is electrically connected to the capacitor C1 and the recording electrode unit 3011, respectively. The output end of the inductor L1 is electrically connected to the capacitor C2 and the voltage following module 303, respectively. The capacitor C1 and the capacitor C2 are grounded, respectively. The second filtering unit 3022 includes an inductor L2, a capacitor C3 and a capacitor C4. The input end of the inductor L2 is electrically connected to the capacitor C3 and the reference electrode unit 3012, respectively. The output end of the inductor L2 is electrically connected to the capacitor C4 and the voltage following module 303, respectively. The capacitor C3 and the capacitor C4 are grounded, respectively.
[0041] Specifically, the recording electrode unit 3011 transmits the collected electromyographic signal data to the voltage follower module 303 through the series inductor L1. The inductor L1, the capacitor C1 and the capacitor C2 in the first filtering unit 3021 are connected to form a π-type low-pass filtering circuit. The main energy frequency band of the human electromyographic signal is concentrated in the range of 10 to 150 Hz. The π-type low-pass filtering circuit composed of the inductor L1, the capacitor C1 and the capacitor C2 adjusts the inductance value to lower the resonant frequency f so that signals below 150 Hz can pass normally, thereby filtering out most of the interference of the electromyographic signal. The second filtering unit 3022 is the same as the above scheme.
[0042] Furthermore, the voltage follower module 303 includes a voltage follower U1, an input resistor R1, an input resistor R2, a feedback resistor R3 and a feedback resistor R4, the two ends of the input resistor R1 are respectively electrically connected to the first positive input terminal pin of the voltage follower U1 and the output terminal of the inductor L1, the two ends of the input resistor R2 are respectively electrically connected to the second positive input terminal pin of the voltage follower U1 and the output terminal of the inductor L2, the two ends of the feedback resistor R3 are respectively electrically connected to the first output terminal pin and the first reverse input terminal pin of the voltage follower U1, the two ends of the feedback resistor R4 are respectively electrically connected to the second output terminal pin and the second reverse input terminal pin of the voltage follower U1, and the first output terminal pin and the second output terminal are respectively electrically connected to the resistor-capacitor coupling module 304.
[0043] Specifically, after the electromyographic signal collected by the recording electrode unit 3011 passes through the π-type low-pass filter circuit, the input resistor R1 is connected in series to the first positive input terminal pin (i.e., pin 3) of the voltage follower U1. After the electromyographic signal collected by the reference electrode unit 3012 passes through the π-type low-pass filter circuit, the input resistor R2 is connected in series to the second positive input terminal pin (i.e., pin 5) of the voltage follower U1. The second output terminal pin (i.e., pin 7) of the voltage follower U1 is connected in series with the feedback resistor R4 to the second reverse input terminal pin (pin 6) of the voltage follower U1, thereby increasing the input impedance through the voltage follower and stabilizing the collected electromyographic signal.
[0044] Furthermore, the RC coupling module 304 includes a capacitor C5, a capacitor C6, a resistor R5 and a resistor R6, the first end of the capacitor C5 is electrically connected to the first reverse input terminal, the second end of the capacitor C5 is electrically connected to the resistor R5 and serves as an output pin, the second end of the capacitor C6 is electrically connected to the resistor R6 and serves as an output pin, the resistor R5 and the resistor R6 are connected in series, and the common mode reference potential point is set between the resistor R5 and the resistor R6.
[0045] Specifically, the ratio of the differential mode voltage gain to the common mode voltage gain is called the common mode rejection ratio. The collected electromyographic signal is output by the first output terminal pin (i.e., pin 1) and the second output terminal pin (i.e., pin 7) of the voltage follower U1. The DC voltage is isolated by capacitors C5 and C6 to prevent zero drift and ensure stable output of the electromyographic signal.
[0046] Furthermore, the filtering module also includes a third filtering unit 3023, which includes an inductor L3, a capacitor C7 and a capacitor C8. The input end of the inductor L3 is electrically connected to the capacitor C7 and the ground electrode unit 3013 respectively, and the output end of the inductor L3 is electrically connected to the capacitor C8 and the driving module 305 respectively. The capacitors C7 and C8 are grounded respectively.
[0047] Furthermore, the driving module 305 includes a reverse amplifier U2, a resistor R7, a resistor R9 and a feedback resistor R8, the two ends of the resistor R7 are electrically connected to the output end of the inductor L3 and the third output end of the reverse amplifier U2, respectively, the two ends of the feedback resistor R8 are electrically connected to the third reverse input end and the third output end of the reverse amplifier U2, respectively, the first end of the resistor R9 is electrically connected to the fourth reverse input end and the fourth output end of the reverse amplifier U2, respectively, and the second end of the resistor R9 is electrically connected to the third reverse input end.
[0048] The fourth positive input terminal pin and the third positive input terminal pin of the reverse amplifier U2 are electrically connected to the common mode reference potential point respectively.
[0049] Specifically, the fourth positive input terminal pin (i.e., pin 3) of the reverse amplifier U2 inputs the common mode reference potential point, and the fourth reverse input terminal pin (i.e., pin 2) of the reverse amplifier U2 is short-circuited to the fourth output terminal pin (i.e., pin 1) of the reverse amplifier U2, thereby stabilizing the common mode reference potential point and outputting it from the fourth output terminal pin (i.e., pin 1);
[0050] The third positive input terminal pin (pin 5) of the reverse amplifier U2 inputs the common-mode reference potential point, the fourth output terminal pin (i.e., pin 1) of the reverse amplifier U2 is connected in series with resistor R9 to the third reverse input terminal pin (pin 6) of the reverse amplifier U2, the third reverse input terminal pin (pin 6) of the reverse amplifier U2 is connected in series with feedback resistor R8 to the third output terminal pin (pin 7) of the reverse amplifier U2, the feedback resistor R8 and the resistor R9 have the same resistance value, thereby the common-mode reference potential point is reversely output from the third output terminal pin (pin 7) of the reverse amplifier U2, and the reverse common-mode reference potential point is fed back to the ground electrode unit 3013 through resistor R7 and the filter circuit, thereby offsetting the common-mode interference signal of the human body.
[0051] like Figure 2 As shown, the utility model proposes in the second aspect a circuit system for collecting electromyographic signal data with anti-interference, which includes a TMS device 100 and a MEP device 200 connected to each other, the TMS device 100 includes two electromyographic acquisition units 101, a differential signal amplifying unit 102, an AD acquisition unit 103, a data processing unit 104 and a communication unit 105, the electromyographic acquisition unit 101 includes an anti-interference circuit for collecting electromyographic signal data as in any of the above schemes, the electromyographic acquisition unit is used to collect clean electromyographic signals, the differential signal amplifying unit 102 is respectively connected to the two electromyographic acquisition units 101 to amplify and process the received electromyographic signals and obtain two amplified electromyographic signals respectively, the AD acquisition unit 103 is respectively connected to the differential signal amplifying unit 102 and the data processing unit 104, the AD acquisition unit 103 transmits the two amplified electromyographic signals to the data processing unit 104 for processing, and the communication unit 105 transmits the processed two amplified electromyographic signals to the MEP device 200 for display.
[0052] Specifically, the MEP device 200 includes a display device and a receiving unit, and the TMS device 100 also includes a triggering unit and a transmitting unit both of which are electrically connected to the data processing unit 104. The receiving unit receives the pulse signal from the stimulation coil, and transmits the pulse signal to the triggering unit on the MEP device by wireless transmission. The receiving unit and the triggering unit use a 433 wireless transceiver module. Of course, the receiving unit and the triggering unit can also communicate by wired transmission. The display device is used to visualize the two processed amplified electromyographic signals.
[0053] The above is a circuit or multiple implementation methods for collecting electromyographic signal data, which are provided in combination with specific content, and it is not considered that the specific implementation of the utility model is limited to these descriptions. Any method, structure, etc. similar to or identical to the method, structure, etc. of the utility model, or a number of technical deductions or replacements based on the concept of the utility model, shall be regarded as the protection scope of the utility model.
Claims
1. An anti-interference circuit for collecting electromyographic signal data, characterized in that: include: A signal acquisition module, which is used to collect electromyographic signals; A filtering module, which is electrically connected to the signal acquisition module to filter out interference signals; A voltage follower module (303), which is electrically connected to the filter module to receive the electromyographic signal, and the voltage follower module (303) is used to increase input impedance; A resistance-capacitance coupling module (304) electrically connected to the voltage follower module (303) to isolate a direct current voltage in the circuit, the resistance-capacitance coupling module (304) comprising a common-mode reference potential point; The driving module (305) is electrically connected to the filtering module and the common mode reference potential point respectively to offset the common mode interference signal.
2. The anti-interference circuit for collecting electromyographic signal data according to claim 1, characterized in that: The signal acquisition module comprises a recording electrode unit (3011), a reference electrode unit (3012) and a ground electrode unit (3013).
3. The anti-interference circuit for collecting electromyographic signal data according to claim 2, characterized in that: The filtering module includes a first filtering unit (3021) and a second filtering unit (3022). The first filtering unit (3021) includes an inductor L1, a capacitor C1 and a capacitor C2. The input end of the inductor L1 is electrically connected to the capacitor C1 and the recording electrode unit (3011) respectively, and the output end of the inductor L1 is electrically connected to the capacitor C2 and the voltage follower module (303) respectively. The capacitor C1 and the capacitor C2 are grounded respectively. The second filtering unit (3022) includes an inductor L2, a capacitor C3 and a capacitor C4. The input end of the inductor L2 is electrically connected to the capacitor C3 and the reference electrode unit (3012) respectively, and the output end of the inductor L2 is electrically connected to the capacitor C4 and the voltage follower module (303) respectively. The capacitor C3 and the capacitor C4 are grounded respectively.
4. The anti-interference circuit for collecting electromyographic signal data according to claim 3, characterized in that: The voltage follower module (303) comprises a voltage follower U1, an input resistor R1, an input resistor R2, a feedback resistor R3 and a feedback resistor R4, wherein two ends of the input resistor R1 are respectively electrically connected to a first positive input terminal pin of the voltage follower U1 and an output terminal of the inductor L1, two ends of the input resistor R2 are respectively electrically connected to a second positive input terminal pin of the voltage follower U1 and an output terminal of the inductor L2, two ends of the feedback resistor R3 are respectively electrically connected to a first output terminal pin and a first reverse input terminal pin of the voltage follower U1, two ends of the feedback resistor R4 are respectively electrically connected to a second output terminal pin and a second reverse input terminal pin of the voltage follower U1, and the first output terminal pin and the second output terminal pin are respectively electrically connected to the resistor-capacitor coupling module (304).
5. The anti-interference circuit for collecting electromyographic signal data according to claim 4, characterized in that: The resistor-capacitor coupling module (304) comprises a capacitor C5, a capacitor C6, a resistor R5 and a resistor R6, wherein the first end of the capacitor C5 is electrically connected to the first reverse input terminal, the second end of the capacitor C5 is electrically connected to the resistor R5 and serves as an output pin, the second end of the capacitor C6 is electrically connected to the resistor R6 and serves as an output pin, the resistor R5 and the resistor R6 are connected in series, and the common mode reference potential point is set between the resistor R5 and the resistor R6.
6. The anti-interference circuit for collecting electromyographic signal data according to claim 3, characterized in that: The filtering module also includes a third filtering unit (3023), and the third filtering unit (3023) includes an inductor L3, a capacitor C7 and a capacitor C8, the input end of the inductor L3 is electrically connected to the capacitor C7 and the ground electrode unit (3013) respectively, the output end of the inductor L3 is electrically connected to the capacitor C8 and the driving module (305) respectively, and the capacitor C7 and the capacitor C8 are grounded respectively.
7. The anti-interference circuit for collecting electromyographic signal data according to claim 6, characterized in that: The driving module (305) comprises an inverting amplifier U2, a resistor R7, a resistor R9 and a feedback resistor R8, wherein two ends of the resistor R7 are respectively electrically connected to the output end of the inductor L3 and the third output end of the inverting amplifier U2, two ends of the feedback resistor R8 are respectively electrically connected to the third inverting input end and the third output end of the inverting amplifier U2, a first end of the resistor R9 is respectively electrically connected to the fourth inverting input end and the fourth output end of the inverting amplifier U2, and a second end of the resistor R9 is respectively electrically connected to the third inverting input end.
8. The anti-interference circuit for collecting electromyographic signal data according to claim 7, characterized in that: The fourth positive input terminal pin and the third positive input terminal pin of the reverse amplifier U2 are electrically connected to the common mode reference potential point respectively.
9. A system for collecting electromyographic signal data and preventing interference, characterized in that: The invention comprises a TMS device (100) and an MEP device (200) connected to each other, wherein the TMS device (100) comprises two myoelectric acquisition units (101), a differential signal amplification unit (102), an AD acquisition unit (103), a data processing unit (104) and a communication unit (105); The electromyographic acquisition unit (101) comprises an anti-interference circuit for collecting electromyographic signal data according to any one of claims 1 to 8, the electromyographic acquisition unit (101) is used to collect clean electromyographic signals, the differential signal amplifying unit (102) is respectively connected to the two electromyographic acquisition units (101) to amplify the received electromyographic signals and obtain two amplified electromyographic signals respectively, the AD acquisition unit (103) is respectively connected to the differential signal amplifying unit (102) and the data processing unit (104), the AD acquisition unit (103) transmits the two amplified electromyographic signals to the data processing unit (104) for processing, and the communication unit (105) transmits the processed two amplified electromyographic signals to the MEP device (200) for display.