A myoelectric and evoked response device calibration apparatus

Abstract

The utility model provides a kind of electromyography and evoked response equipment calibration device, it is related to equipment calibration technical field.The calibration device includes shell, is provided with handheld handle, liquid crystal touch control screen, signal electrode, power button and charging interface on shell, shell interior is provided with function signal generation module, signal display module, ARM single-chip microcomputer and balanced attenuator;Signal generation module is connected with control screen communication, signal generation module exports function signal to attenuator, attenuator is electrically connected with the recording end and reference end of signal amplifier of electromyography and evoked response equipment via signal electrode;Control screen is connected with signal display module communication, signal display module is electrically connected with the output end of electric stimulator of electromyography and evoked response equipment.This calibration device integrates electromyography signal acquisition and evoked electric stimulation signal display reading function, realizes modularization, integration, miniaturization, provides calibration measurement technical support and equipment support for electromyography and evoked response equipment.

Description

Technical Field

[0001] This utility model relates to the field of equipment calibration technology, specifically to a calibration device for electromyography and induced response equipment. Background Technology

[0002] In recent years, electromyography (EMG) and evoked response devices (such as evoked potential analyzers) have been increasingly used in medicine, sports science, and rehabilitation medicine. These devices are crucial for determining the functional status and identifying suspicious lesions of the peripheral neuromuscular and central nervous systems, detecting subclinical lesions, and precisely locating lesions. Clinically, they are widely used in neurosurgery, neurology, hand surgery, orthopedics, rehabilitation medicine, pediatrics, and other departments, serving as an important tool for neurophysiological monitoring.

[0003] Electromyography (EMG) and evoked response devices (such as evoked potential analyzers) include EMG equipment and evoked response devices. EMG equipment is a medical electrical device used to detect and analyze bioelectrical potentials associated with nerve and muscle activity, which may be spontaneous or triggered by electrical or other stimuli. Evoked response devices are medical electrical devices used to detect and analyze bioelectrical potentials generated by evoked stimuli, such as electric shocks, touch, auditory, visual, and olfactory stimuli. Clinically, EMG can be used to determine the normality of neuromuscular function, as well as the location, nature, and extent of neuromuscular diseases. Inaccurate EMG and evoked response devices (such as evoked potential analyzers) can lead to misdiagnosis or missed diagnosis. Inaccurate EMG feedback may affect the development of rehabilitation programs, leading to overtraining or undertraining. Unreliable data may affect clinical trial results, incorrectly supporting or rejecting a therapy, and misleading medical progress. Therefore, calibration of EMG and evoked response devices (such as evoked potential analyzers) is essential.

[0004] Currently, most clinically used electromyography (EMG) and evoked response (EVR) devices integrate EMG and EVR equipment into a single unit. The calibration of EMG and EVR equipment (such as evoked potential analyzers) primarily follows the JJF1896-2021 "Calibration Specification for EMG and Evoked Response Equipment" issued by the State Administration for Market Regulation in 2021. This specification lists the measurement standards and equipment required for metrological calibration of EMG and EVR equipment (such as evoked potential analyzers), as well as the technical specifications that must be met, including function signal generators, oscilloscopes, attenuators, and resistors. Therefore, the required measuring equipment for calibration is numerous and bulky, leading to inconvenience in on-site calibration. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of the prior art by providing a calibration device for electromyography (EMG) and evoked response (EVR) equipment, thereby solving the calibration problem of EMG and EVR equipment.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a calibration device for electromyography and induced response equipment. The calibration device includes a device shell, on which a hand handle, an LCD touch control screen, signal electrodes, a power button and a charging interface are provided. Inside the device shell, a function signal generation module, a signal display module, an ARM microcontroller and a balance attenuator are provided. The function signal generation module is connected to the LCD touch control screen. The function signal generation module is used to output the generated function signal to the balance attenuator. The balance attenuator is electrically connected to the recording end and reference end of the signal amplifier of the electromyography and evoked response device to be calibrated via the signal electrodes. The LCD touch control screen is connected to the signal display module, and the signal display module is electrically connected to the output terminal of the electromyography and evoked response device to be calibrated via a parallel resistor.

[0007] Optionally, the function signal generation module includes a programmable waveform generator chip, a digital potentiometer chip, a first signal amplifier, a first relay group, and a second relay group. The programmable waveform generator chip is used to generate a function signal. The generated function signal passes through the digital potentiometer chip and the first signal amplifier in sequence, and is then output to the balanced attenuator. The LCD touch screen is used to receive signal waveform parameters set by the user and send commands to the ARM microcontroller via the serial port. The ARM microcontroller is used to control the programmable waveform generator chip to generate function waveforms of a specified frequency via the SPI interface. The ARM microcontroller is also used to control the voltage division ratio of the digital potentiometer chip via the SPI interface, control the gain coefficient of the first signal amplifier via the first relay group, and control the attenuation coefficient of the balanced attenuator via the second relay group, so as to adjust the signal amplitude to a preset value.

[0008] Optionally, the signal display module includes an impedance adjustment circuit, a gain control circuit, a vertical position adjustment circuit, and an analog multiplexer. The electrical stimulation signal emitted by the electrical stimulator is processed sequentially through the impedance adjustment circuit, gain control circuit, and vertical position adjustment circuit, and then input to the ADC port of the ARM microcontroller. The ARM microcontroller is used to control the ADC module to sample the analog signal and convert it into binary data, which is then sent to the LCD touch screen for display and measurement via the serial port. Impedance adjustment circuits are used to prevent overcompensation and undercompensation of electrical stimulation signals by adjusting the compensation capacitor. The ARM microcontroller is also used to control the analog multiplexer according to user settings, selecting different gain resistors to be connected to the gain control circuit in order to achieve switching between different gain levels. The DAC port of the ARM microcontroller is also used to output a controllable DC voltage. This DC voltage is input to the vertical position adjustment circuit and subtracted from the electrical stimulation signal. The difference is input to the ADC port of the ARM microcontroller. By adjusting the magnitude of the DC voltage, the vertical position of the signal on the LCD touch screen can be changed.

[0009] Optionally, the LCD touch control screen uses a color LCD capacitive touch screen with a resolution of 800*480, and the touch screen runs the Android 11 operating system.

[0010] Optionally, the ARM microcontroller is an ARM Cortex-A55 quad-core processor, configured with 2GB of LPDDR4 memory and 8GB of Flash ROM.

[0011] Optionally, the dimensions of the device housing are 230mm × 150mm × 60mm.

[0012] Optionally, the charging interface is a Type-C interface.

[0013] The beneficial effects of this utility model include: This utility model provides a calibration device for electromyography (EMG) and evoked response (EVR) equipment, comprising a housing with a handle, an LCD touchscreen control panel, signal electrodes, a power button, and a charging interface. Inside the housing are a function signal generation module, a signal display module, an ARM microcontroller, and a balancing attenuator. The function signal generation module is communicatively connected to the LCD touchscreen control panel and outputs the generated function signal to the balancing attenuator. The balancing attenuator is electrically connected via the signal electrodes to the recording and reference terminals of the signal amplifier of the EMG and evoked response equipment to be calibrated. The LCD touchscreen control panel is communicatively connected to the signal display module, which is electrically connected to the output terminal of the electrostimulator of the EMG and evoked response equipment to be calibrated via a parallel resistor. This calibration device, designed to meet the metrological calibration needs of EMG and evoked response equipment, integrates EMG signal acquisition and evoked stimulation signal display and reading functions. It achieves a modular, integrated, and miniaturized design, providing calibration metrological technical support and equipment support for clinically used EMG and evoked response equipment. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1A schematic diagram of the appearance of the electromyography and evoked response equipment calibration device provided in an embodiment of the present invention is shown; Figure 2 A schematic diagram of the structure of the electromyography and evoked response calibration device provided in an embodiment of the present invention is shown; Figure 3 A schematic diagram of the function signal generation module provided in an embodiment of this utility model is shown; Figure 4 A schematic diagram of the structure of the signal display module provided in an embodiment of the present invention is shown; Figure 5 The diagram shows the operation flowchart of the electromyography and induced response equipment calibration device provided in the embodiment of this utility model. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] Currently, most clinically used electromyography (EMG) and evoked response (EVR) devices integrate EMG and EVR equipment into a single unit. The calibration of EMG and EVR devices (such as evoked potential analyzers) primarily follows the JJF1896-2021 "Calibration Specification for EMG and Evoked Response Equipment" issued by the State Administration for Market Regulation in 2021. This specification lists the measurement standards and equipment required for the metrological calibration of EMG and EVR devices, as well as the technical specifications that must be met, including function signal generators, oscilloscopes, attenuators, and resistors. Therefore, the required measuring equipment is numerous and bulky, leading to inconvenience in on-site calibration. To address this, this application designs and develops a calibration device for EMG and EVR devices (such as EVR analyzers). Through modular, integrated, and miniaturized design research, the measurement standard equipment is optimized and integrated to form a portable metrological calibration device. The device has both analog signal output function, which can output standard waveform signals required by calibration specifications, and stimulation signal calibration function, which can display and read the stimulation signal parameters output by the evoked stimulator.

[0022] Figure 1 A schematic diagram of the appearance of the electromyography and evoked response calibration device provided in an embodiment of the present invention is shown. Figure 2 A schematic diagram of the structure of the electromyography and induced response equipment calibration device provided in an embodiment of the present invention is shown.

[0023] like Figure 1 and Figure 2 As shown, the electromyography and evoked response calibration device provided by this utility model includes a device housing, on which are mounted a handheld handle 1, an LCD touch screen 2, signal electrodes 3, a power button 4, and a charging interface 5. Inside the device housing are a function signal generation module, a signal display module, an ARM microcontroller, and a balancing attenuator. The dimensions of the device housing are 230mm × 150mm × 60mm. The calibration device has a built-in rechargeable battery, uses USB charging, and the charging interface is a Type-C interface.

[0024] The function signal generation module is connected to the LCD touch control screen. The function signal generation module is used to output the generated function signal to the balance attenuator. The balance attenuator is electrically connected to the recording end and reference end of the signal amplifier of the electromyography and evoked response device to be calibrated via the signal electrodes.

[0025] The LCD touchscreen control panel communicates with the signal display module, which in turn connects to the output of the electrical stimulator in the electromyography and evoked response device to be calibrated via a parallel resistor (e.g., ...). Figure 2 The resistor shown is 1kΩ and is electrically connected.

[0026] Figure 3 A schematic diagram of the structure of a function signal generation module provided in an embodiment of the present invention is shown. The function signal generation module includes a programmable waveform generator chip, a digital potentiometer chip, and a first signal amplifier (i.e., Figure 3 The signal amplifier shown), the first relay group (i.e. Figure 3 The relay group 1 shown) and the second relay group (i.e. Figure 3 The relay group 2 shown in the diagram. A programmable waveform generator chip is used to generate a function signal. This function signal passes sequentially through a digital potentiometer chip and a first signal amplifier before being output to a balanced attenuator (such as...). Figure 3 (The attenuation circuit shown). The LCD touch screen is used to receive the signal waveform parameters set by the user and send commands to the ARM microcontroller via the serial port; the ARM microcontroller is used to control the programmable waveform generator chip to generate a function waveform of a specified frequency via the SPI interface; the ARM microcontroller is also used to control the voltage division ratio of the digital potentiometer chip via the SPI interface, control the gain coefficient of the first signal amplifier via the first relay group, and control the attenuation coefficient of the balanced attenuator via the second relay group, so as to adjust the signal amplitude to a preset value.

[0027] Figure 4A schematic diagram of the signal display module provided in an embodiment of this utility model is shown. The signal display module includes an impedance adjustment circuit, a gain control circuit, a vertical position adjustment circuit, and an analog multiplexer. The electrical stimulation signal emitted by the electromyography and evoked response device to be calibrated is processed sequentially through the impedance adjustment circuit, the gain control circuit, and the vertical position adjustment circuit, and then input to the ADC port of the ARM microcontroller. The ARM microcontroller controls the ADC module to sample the analog signal and convert it into binary data, which is then sent to the LCD touch screen for display and measurement via a serial port. The impedance adjustment circuit is used to prevent overcompensation and undercompensation of the electrical stimulation signal by adjusting the compensation capacitor. The ARM microcontroller is also used to control the analog multiplexer according to user settings, selecting different gain resistors connected to the gain control circuit to achieve switching between different gain levels, thereby displaying the appropriate signal amplitude on the interface. The DAC port of the ARM microcontroller is also used to output a controllable DC voltage. This DC voltage is input to the vertical position adjustment circuit and subtracted from the electrical stimulation signal. The difference is input to the ADC port of the ARM microcontroller. By adjusting the magnitude of the DC voltage, the vertical position of the signal on the LCD touch screen can be changed. In addition, time base adjustment can be achieved by setting the data sampling period using an ARM microcontroller.

[0028] The LCD touchscreen control panel uses a color capacitive touchscreen with a resolution of 800*480, running the Android 11 operating system. The LCD touchscreen control panel is mainly used to display signal waveforms and to measure parameters such as amplitude, frequency, and pulse width of the electrical stimulation signal. The ARM microcontroller is an ARM Cortex-A55 quad-core processor, configured with 2GB of LPDDR4 memory and 8GB of Flash ROM. The ARM microcontroller's two serial ports are connected to the function signal generation module and signal display module of the calibration device, respectively, to achieve independent control.

[0029] Figure 5 The diagram shows the operation flowchart of the electromyography and induced response equipment calibration device provided in the embodiment of this utility model.

[0030] Traditional measurement standard equipment includes function generators, oscilloscopes, attenuators, and resistors. These are all independent devices, bulky, and inconvenient to carry. This application integrates a signal simulation module, signal measurement module, signal attenuation, and resistor into a single device through a modular design, outputting or inputting calibration signals through different signal electrodes. Internally, relays are used to disconnect or connect the attenuator and resistor, while also enabling independent traceability of the attenuator and resistor. Furthermore, the device uses a boost circuit to generate all power, eliminating the need for an external power supply and reducing external interference and noise. A touchscreen LCD control panel enables human-machine interaction, reducing the error rate of manual operation and improving the accuracy of metrological calibration. The portable metrological calibration device proposed in this application can be applied as a metrological standard device for the routine metrological calibration of electromyography and evoked response equipment.

[0031] In summary, this calibration device, based on the metrological calibration needs of electromyography (EMG) and evoked response (EVR) equipment, integrates the functions of EMG signal acquisition and the display and reading of EVR stimulation signals. It achieves a modular, integrated, and miniaturized design, solving the problems of existing calibration devices being numerous, bulky, and inconvenient to carry for on-site calibration. It provides calibration metrological technical support and equipment support for clinically used EMG and EVR equipment, while making on-site calibration work more accurate, convenient, and efficient for metrologists, thus safeguarding the accuracy and reliability of EMG and EVR equipment during use.

[0032] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A calibration device for electromyography and evoked response equipment, characterized in that, The calibration device includes a device housing, on which are provided a hand handle, an LCD touch control screen, signal electrodes, a power button and a charging interface. Inside the device housing are provided a function signal generation module, a signal display module, an ARM microcontroller and a balance attenuator. The function signal generation module is connected to the LCD touch control screen. The function signal generation module is used to output the generated function signal to the balance attenuator. The balance attenuator is electrically connected to the recording end and reference end of the signal amplifier of the electromyography and evoked response device to be calibrated via the signal electrodes. The LCD touch control screen is connected to the signal display module, and the signal display module is electrically connected to the output terminal of the electromyography and evoked response device to be calibrated via a parallel resistor.

2. The calibration device for electromyography and evoked response equipment according to claim 1, characterized in that, The function signal generation module includes a programmable waveform generator chip, a digital potentiometer chip, a first signal amplifier, a first relay group, and a second relay group. The programmable waveform generator chip is used to generate a function signal. The generated function signal passes through the digital potentiometer chip and the first signal amplifier in sequence, and is then output to the balanced attenuator. The LCD touch screen is used to receive signal waveform parameters set by the user and send instructions to the ARM microcontroller via the serial port. The ARM microcontroller is used to control the programmable waveform generator chip to generate function waveforms of a specified frequency via the SPI interface. The ARM microcontroller is also used to control the voltage division ratio of the digital potentiometer chip via the SPI interface, control the gain coefficient of the first signal amplifier via the first relay group, and control the attenuation coefficient of the balanced attenuator via the second relay group, so as to adjust the signal amplitude to a preset value.

3. The calibration device for electromyography and evoked response equipment according to claim 2, characterized in that, The signal display module includes an impedance adjustment circuit, a gain control circuit, a vertical position adjustment circuit, and an analog multiplexer. The electrical stimulation signal emitted by the electrical stimulator is processed sequentially through the impedance adjustment circuit, gain control circuit, and vertical position adjustment circuit, and then input to the ADC port of the ARM microcontroller. The ARM microcontroller is used to control the ADC module to sample the analog signal and convert it into binary data, which is then sent to the LCD touch screen for display and measurement via the serial port. Impedance adjustment circuits are used to prevent overcompensation and undercompensation of electrical stimulation signals by adjusting the compensation capacitor. The ARM microcontroller is also used to control the analog multiplexer according to user settings, selecting different gain resistors to be connected to the gain control circuit in order to achieve switching between different gain levels. The DAC port of the ARM microcontroller is also used to output a controllable DC voltage. This DC voltage is input to the vertical position adjustment circuit and subtracted from the electrical stimulation signal. The difference is input to the ADC port of the ARM microcontroller. By adjusting the magnitude of the DC voltage, the vertical position of the signal on the LCD touch screen can be changed.

4. The calibration device for electromyography and evoked response equipment according to claim 3, characterized in that, The LCD touch control screen uses a color LCD capacitive touch screen with a resolution of 800*480, and the touch screen runs the Android 11 operating system.

5. The calibration device for electromyography and evoked response equipment according to claim 2 or 3, characterized in that, The ARM microcontroller is an ARM Cortex-A55 quad-core processor, equipped with 2GB of LPDDR4 memory and 8GB of Flash ROM.

6. The calibration device for electromyography and evoked response equipment according to claim 1, characterized in that, The dimensions of the device casing are 230mm × 150mm × 60mm.

7. The calibration device for electromyography and evoked response equipment according to claim 1, characterized in that, The charging port is a Type-C interface.

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