Electrical stimulation device

Abstract

The utility model discloses an electrical stimulation device, which comprises a main control module, an electrical stimulation signal output module, an electrical stimulation signal feedback module, an electrode module and a power supply module, the electrical stimulation signal output module comprises a booster circuit, a first voltage following circuit and a bipolar conversion circuit, the booster circuit is used for boosting the direct current obtained from the power supply module, the first voltage following circuit is used for following the boosted voltage and outputting a first stable voltage, and the bipolar conversion circuit is used for converting the first stable voltage into a second stable voltage; the bipolar conversion circuit is used for performing signal overturning and modulation on the first stable voltage, generating a bipolar signal and outputting the bipolar signal to the electrode module; the electrical stimulation signal feedback module comprises an electrode signal feedback module and an electromyographic signal feedback module, and the electrode signal feedback module is used for acquiring a bipolar signal and feeding back the bipolar signal to the main control module; the electromyographic signal feedback module is used for obtaining electromyographic signals and feeding back the electromyographic signals to the main control The electrical stimulation device has the advantages of being good in adaptability to electrode contact conditions, high in safety and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical stimulation. More specifically, the utility model relates to an electrical stimulation device. Background Art

[0002] An electrical stimulation device is a medical device used to treat patients with mental illnesses, muscle atrophy, fractures and other symptoms. The device applies an electric current to nerves or muscles to achieve a therapeutic effect. The electrical stimulation system mainly consists of a power supply, electrodes, a controller, an amplifier, etc. The power supply provides electricity, the electrodes are the interfaces connecting the device and the patient, the controller is used to control the parameters of the electrical stimulation, and the amplifier can amplify the current signal to obtain a better therapeutic effect.

[0003] For an existing electrical stimulation device, such as the utility model patent with the publication number of CN221014192U, which discloses "An electroencephalogram acquisition and transcranial electrical stimulation system", includes a central control module, a transcranial electrical stimulation module, an analog switch module, an electrode module and a current feedback module; the output end of the analog switch module is connected to the electrode module, and the analog switch module is used to receive the electrical stimulation control signal to realize the conduction between the transcranial electrical stimulation module and the electrode module; the output end of the current feedback module is connected to the central control module, and the current feedback module is used to collect the current value of the electrical stimulation signal sent by the transcranial electrical stimulation module and send a current digital signal to the central control module. This system mainly monitors and controls the current output by the transcranial electrical stimulation module, and improves the safety performance of the device by adding an analog switch module between the transcranial electrical stimulation module and the electrode module to control the disconnection or conduction of the transcranial electrical stimulation module and the electrode module. However, during the treatment process, inadvertent movements or sweating of the patient will change the contact area or tightness between the electrode patch and the skin, resulting in a change in the contact resistance. Even at the same current, when the contact resistance increases, the voltage across the electrodes will rise, and the excessive voltage may cause discomfort such as local overheating and increased tingling, and may even cause damage to human tissues. The safety of the device needs to be further improved. Summary of the Utility Model

[0004] An object of the utility model is to provide an electrical stimulation device to solve at least the above problems.

[0005] To achieve the object and other advantages of the utility model, there is provided an electrical stimulation device, including a main control module, an electrical stimulation signal output module, an electrical stimulation signal feedback module, an electrode module and a power supply module; wherein,

[0006] The electrical stimulation signal output module includes a boost circuit, a first voltage follower circuit, and a bipolar conversion circuit. The boost circuit is used to boost the direct current obtained from the power supply module. The first voltage follower circuit is used to perform voltage following on the boosted voltage and output a first stable voltage. The bipolar conversion circuit is used to flip and modulate the obtained first stable voltage to generate a bipolar signal and output it to the electrode module;

[0007] The electrical stimulation signal feedback module includes an electrode signal feedback module and an electromyogram signal feedback module. The electrode signal feedback module is used to obtain the bipolar signal and feedback it to the main control module; the electromyogram signal feedback module is used to obtain the electromyogram signal generated by muscle activity and feedback it to the main control module.

[0008] Preferably, the electrode signal feedback module includes an electrical stimulation signal acquisition circuit, a voltage dividing resistor circuit, a second voltage follower circuit, a first differential amplifier circuit, and a first analog-to-digital converter connected in sequence. The electrical stimulation signal acquisition circuit is used to obtain the bipolar signal. The voltage dividing resistor circuit is used to divide the voltage of the bipolar signal. The second voltage follower circuit is used to perform voltage following on the divided voltage and output a second stable voltage. The first differential amplifier circuit is used to amplify the second stable voltage. The first analog-to-digital converter is used to perform analog-to-digital conversion on the amplified voltage and output it to the main control module.

[0009] Preferably, the electromyogram signal feedback module includes an electromyogram signal acquisition circuit, a filtering circuit, a second differential amplifier circuit, a band-pass filter, a power frequency notch filter, a secondary amplifier circuit, a level elevation circuit, and a second analog-to-digital converter connected in sequence. The electromyogram signal acquisition circuit is used to acquire the electromyogram signal. The filtering circuit is used to perform preliminary filtering on the electromyogram signal. The second differential amplifier circuit is used to amplify the filtered electromyogram signal. The band-pass filter is used to filter out signals outside the range of 20 - 150 Hz in the electromyogram signal. The power frequency notch filter is used to remove the power frequency interference signal in the circuit. The secondary amplifier circuit is used to further amplify the processed electromyogram signal. The level elevation circuit is used to perform level elevation processing on the amplified electromyogram signal. The second analog-to-digital converter is used to perform analog-to-digital conversion on the level elevation processed electromyogram signal and output it to the main control module.

[0010] Preferably, the main control module is built-in with a PID controller. The main control module is used to obtain the formulation parameters, the bipolar signal, and the electromyogram signal, and track and adjust the bipolar signal output by the electrical stimulation signal output module.

[0011] Preferably, the electric stimulation device further includes a screen display module, a key and peripheral indicator light module connected to the main control module.

[0012] Preferably, the electric stimulation device further includes a touch display module connected to the main control module.

[0013] Preferably, the electric stimulation device further includes a data storage module connected to the main control module.

[0014] Preferably, the electric stimulation device further includes an expansion interface module connected to the main control module.

[0015] The present utility model has at least the following beneficial effects:

[0016] By improving the electric stimulation signal output module and the electric stimulation signal feedback module of the electric stimulation device of the present utility model, and by integrating a PID controller in the main control module, on the output module side, a bipolar sine wave signal can be modulated and generated, effectively improving the electric stimulation effect. At the same time, the main control module can track and adjust the output based on the configured parameters, the collected bipolar sine wave signal and the electromyogram signal, so as to achieve the constant voltage output of the electric stimulation device. During the use of this device, it has good adaptability to the electrode contact situation, the change of the electrode contact resistance has little influence on the output voltage, and it can continuously provide a relatively stable stimulation voltage under different contact conditions, effectively improving the safety of the device.

[0017] Other advantages, objectives and features of the present utility model will be partially reflected by the following description, and partially will also be understood by those skilled in the art through the research and practice of the present utility model. Brief Description of the Drawings

[0018] Figure 1 is a schematic diagram of the overall connection structure of the electric stimulation device according to an embodiment of the present utility model;

[0019] Figure 2 is a schematic diagram of the connection structure of the electric stimulation signal output module according to an embodiment of the present utility model;

[0020] Figure 3 is a circuit diagram of a bipolar conversion circuit according to an embodiment of the present utility model;

[0021] Figure 4 is a waveform diagram of the output of the electric stimulation device according to an embodiment of the present utility model. Detailed Description of the Embodiments

[0022] The following further describes the present utility model in detail in conjunction with the embodiments and the drawings, so that those skilled in the art can implement it according to the description in the specification.

[0023] It should be understood that terms such as "having", "including", and "comprising" used in the present utility model do not exclude the presence or addition of one or more other elements or their combinations. The innovation of the present utility model lies in the improvement of the connection mode between each module or each circuit. For specific circuit structures, such as boost circuits, voltage follower circuits, acquisition circuits, voltage dividing resistor circuits, differential amplifier circuits, filter circuits, secondary amplifier circuits, level elevation circuits, etc., the existing circuits are adopted without special instructions.

[0024] As Figure 1 shown, the present utility model provides an electrical stimulation device, which includes a main control module, an electrical stimulation signal output module, an electrical stimulation signal feedback module, an electrode module, a data storage module (memory), a power supply module (lithium battery), a screen display module (display screen), a key and peripheral indicator light module, and an expansion interface module. Among them,

[0025] the main control module is respectively connected to the electrical stimulation signal output module, the electrical stimulation signal feedback module, the data storage module, the power supply module, the screen display module, the key and peripheral indicator light module, and the expansion interface module. A PID controller is built in the main control module, and the main control module is preferably a STM32F427 / 429 used as the main control chip. The main control module is used to obtain the configuration parameters input by the user through the key module. After digital-to-analog conversion, it controls the electrical stimulation signal output module to output corresponding electrical stimulation signals to the electrode module. At the same time, it obtains the electrical stimulation signals and myoelectric signals after analog-to-digital conversion fed back by the electrical stimulation signal feedback module, and tracks and adjusts the electrical stimulation signals output by the electrical stimulation signal output module. Specifically, the PID controller can, according to the set target stimulation parameters (such as stimulation intensity, frequency, etc.) and the actual feedback of the output of the electrical stimulation device (including electrical stimulation signals and myoelectric signals), by continuously comparing the actually output stimulation intensity with the set value, make timely adjustments, accurately adjust the control signal, so that the actual output can reach the set intensity as accurately as possible, and the error can be controlled within a very small range, thereby providing accurate and stable electrical stimulation treatment for patients. In addition, when it is necessary to change the relevant parameters of the electrical stimulation, for example, to increase the electrical stimulation frequency, the PID controller can quickly change the output control signal according to the new set value and drive the electrical stimulation device to quickly adjust to the new working state.

[0026] As Figure 2As shown in the figure, the electrical stimulation signal output module includes a boost circuit, a first voltage follower circuit, and a bipolar conversion circuit. The boost circuit is used to boost the direct current obtained from the power supply module. The first voltage follower circuit is used to perform voltage following on the boosted voltage and output a first stable voltage. The bipolar conversion circuit is used to flip and modulate the obtained first stable voltage to generate a bipolar signal and output it to the electrode module. Specifically, the modulation of the electrical stimulation signal is controlled by the main control module. The overall process is to obtain a DC power supply from the lithium battery part of the device, adjust the voltage through the DC boost circuit, then perform voltage following on the adjusted voltage through the first voltage follower circuit, and then flip and modulate the DC voltage through the bipolar conversion circuit to form a bipolar sine wave signal. The main control module monitors the frequency and amplitude of the modulated voltage to ensure that the output sine wave signal meets the control requirements and is consistent with the given target signal. The bipolar conversion circuit is as shown in Figure 3 As shown, the waveform output by the electrical stimulation signal output module is as shown in Figure 4 As shown.

[0027] Sine wave frequency: adjustable from 1 kHz (period 1000 us) to 100 kHz (period 10 us), with a step size of 1 Hz;

[0028] Constant voltage output: adjustable from ±0 V to ±100 V for the maximum sine voltage, with a step size of 0.1 V;

[0029] Stimulation duration: adjustable from 10 to 500 us, with a step size of 10 us;

[0030] Stimulation period: adjustable from 1 ms to 1000 ms, with a step size of 1 ms;

[0031] Treatment duration: adjustable from 0 to 10 h, with an interval of 1 min.

[0032] The electrical stimulation signal feedback module includes an electrode signal feedback module and an electromyogram signal feedback module. The electrode signal feedback module is used to obtain the electrical stimulation signal and feedback it to the main control module after processing; the electromyogram signal feedback module is used to obtain the electrical signal generated by muscle activity and feedback it to the main control module after processing. Among them,

[0033] The electrode signal feedback module includes an electrical stimulation signal acquisition circuit, a voltage dividing resistor circuit, a second voltage follower circuit, a first differential amplifier circuit, and a first analog-to-digital converter connected in sequence. The electrical stimulation signal acquisition circuit is used to obtain the bipolar signal. The voltage dividing resistor circuit is used to divide the voltage of the bipolar signal. The second voltage follower circuit is used to perform voltage following on the divided voltage and output a second stable voltage. The first differential amplifier circuit is used to amplify the second stable voltage. The first analog-to-digital converter is used to perform analog-to-digital conversion on the amplified voltage and output it to the main control module. Specifically, the electrical stimulation information acquisition circuit directly obtains the original electrical signals related to electrical stimulation from the electrode, including voltage and current. After receiving the original electrical signals, the voltage dividing circuit divides the input higher voltage according to a specific ratio by reasonably configuring resistors with different resistance values based on the principle of series resistor voltage division to obtain a relatively appropriate and lower voltage value convenient for further processing by subsequent circuits. The second voltage follower circuit receives the voltage signal after voltage division processing and performs voltage following to ensure that the voltage signal transmitted to the differential amplifier circuit can be as stable and distortion-free as possible. After receiving the stable voltage signal from the voltage follower circuit, the first differential amplifier circuit performs amplification processing. The first digital-to-analog converter is used to perform digital-to-analog conversion on the amplified voltage signal to meet the acquisition requirements of the main control module.

[0034] The EMG signal feedback module includes an EMG signal acquisition circuit, a filtering circuit, a second differential amplifier circuit, a band-pass filter, a power frequency notch filter, a two-stage amplifier circuit, a level elevation circuit, and a second analog-to-digital converter connected in sequence. The EMG signal acquisition circuit is used to acquire the EMG signal. The filtering circuit is used to perform preliminary filtering on the EMG signal. The second differential amplifier circuit is used to amplify the filtered EMG signal. The band-pass filter is used to filter out signals outside the range of 20 - 150 Hz in the EMG signal. The power frequency notch filter is used to remove the power frequency interference signal in the circuit. The two-stage amplifier circuit is used to further amplify the processed EMG signal. The level elevation circuit is used to perform level elevation processing on the amplified EMG signal. The second analog-to-digital converter is used to perform analog-to-digital conversion on the EMG signal after level elevation processing and output it to the main control module. Specifically, since the EMG signal is small in signal and has a lot of noise, a filtering circuit is used in the front stage to filter out some clutter. The second differential amplifier circuit can be used to amplify the filtered EMG signal and effectively remove the common-mode ground interference. Then, the signals outside the range of 20 - 150 Hz are filtered out by the band-pass filter, and then the power frequency interference signal in the circuit is removed by the power frequency notch filter. Then, the EMG signal is amplified to the AD voltage range by the two-stage amplifier circuit, and the 3.3V level ADC acquisition requirements of the main control module are met through the level elevation circuit.

[0035] The electrode module includes 2 pairs of electrodes. These 2 pairs of electrodes are shared for both electrical stimulation and EMG acquisition, and EMG signals are acquired during the intervals of discharge stimulation.

[0036] The data storage module is used to store configuration parameters and real-time data such as acquired EMG, heart rate, and blood oxygen.

[0037] The power supply module uses a lithium battery, preferably a rechargeable lithium battery with a voltage of 12V. Further, the power supply module is connected to the main control module through a USB Hub module. The USB Hub module supports 1 Ethernet interface externally, and the USB Hub chip is preferably designed using USB2514B.

[0038] The screen display module and the button and peripheral indicator module are respectively used to display the device status, acquired real-time data, and configuration adjustment parameters to achieve visual adjustment. The adjustment parameters include current, voltage, power, stimulation duration, stimulation period, treatment time, etc. Each parameter can be configured individually or jointly. Further, the screen display module and the button and peripheral indicator module can also be replaced by a touch display module.

[0039] The expansion interface module uses a USB / RS232 interface. The USB / RS232 interface can provide strong compatibility support for interaction with various external devices. It can be used to connect heart rate and blood oxygen devices, enabling the electrical stimulation device to synchronously detect the user's heart rate and blood oxygen while performing electrical stimulation, further improving the safety performance of the device.

[0040] Further, the electrical stimulation device may further include an early warning module, which is connected to the main control module. The early warning module is used to issue an alarm when any one of the electrical stimulation signal, EMG signal, heart rate, and blood oxygen exceeds or falls below a preset threshold range. The early warning module is preferably an audible and visual early warning module, including a high-brightness LED indicator and a speaker, to alert medical staff's attention.

[0041] The electrical stimulation device of the present utility model improves the electrical stimulation signal output module and the electrical stimulation signal feedback module, and a PID controller is built into the main control module. On the output module side, a bipolar sine wave signal can be modulated and generated, effectively improving the electrical stimulation effect. At the same time, the main control module can track and adjust the output through the configured parameters and the acquired bipolar sine wave signal and EMG signal to achieve the constant voltage output of the electrical stimulation device. During the use of this device, it has good adaptability to the electrode contact situation. The change of the electrode contact resistance has little influence on the output voltage, and it can continuously provide a relatively stable stimulation voltage under different contact conditions, effectively improving the safety of the device.

[0042] The number of devices and the processing scale described herein are used to simplify the description of the present utility model. Applications, modifications, and variations of the electrical stimulation device of the present utility model will be apparent to those skilled in the art.

[0043] Although the embodiments of the present utility model have been disclosed as above, it is not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present utility model. For those familiar with the art, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present utility model is not limited to specific details and the illustrated examples described herein.

Claims

1. An electrical stimulation device, characterized in that It includes a main control module, an electrical stimulation signal output module, an electrical stimulation signal feedback module, an electrode module and a power supply module; wherein, The electrical stimulation signal output module includes a boost circuit, a first voltage follower circuit and a bipolar conversion circuit, wherein the boost circuit is used to boost the direct current obtained from the power supply module, the first voltage follower circuit is used to perform voltage following on the boosted voltage and output a first stable voltage, and the bipolar conversion circuit is used to perform signal inversion and modulation on the obtained first stable voltage to generate a bipolar signal and output it to the electrode module; The electrical stimulation signal feedback module includes an electrode signal feedback module and an electromyographic signal feedback module. The electrode signal feedback module is used to obtain the bipolar signal and feed it back to the main control module; the electromyographic signal feedback module is used to obtain the electromyographic signal generated by muscle activity and feed it back to the main control module.

2. The electrical stimulation device according to claim 1, characterized in that The electrode signal feedback module includes an electrical stimulation signal acquisition circuit, a voltage resistance division circuit, a second voltage follower circuit, a first differential amplifier circuit and a first analog-to-digital converter which are connected in sequence, the electrical stimulation signal acquisition circuit is used to obtain the bipolar signal, the voltage resistance division circuit is used to divide the bipolar signal, the second voltage follower circuit is used to follow the divided voltage and output a second stable voltage, the first differential amplifier circuit is used to amplify the second stable voltage, and the first analog-to-digital converter is used to perform analog-to-digital conversion on the amplified voltage and output it to the main control module.

3. The electrical stimulation device according to claim 2, characterized in that The electromyographic signal feedback module includes an electromyographic signal acquisition circuit, a filtering circuit, a second differential amplifier circuit, a bandpass filter, an industrial frequency trap, a secondary amplifier circuit, a level raising circuit and a second analog-to-digital converter connected in sequence. The electromyographic signal acquisition circuit is used to acquire the electromyographic signal, the filtering circuit is used to perform preliminary filtering on the electromyographic signal, the second differential amplifier circuit is used to amplify the filtered electromyographic signal, the bandpass filter is used to filter out signals other than 20-150Hz in the electromyographic signal, the industrial frequency trap is used to remove the industrial frequency interference signal in the circuit, the secondary amplifier circuit is used to further amplify the processed electromyographic signal, the level raising circuit is used to perform level raising processing on the amplified electromyographic signal, and the second analog-to-digital converter is used to perform analog-to-digital conversion on the electromyographic signal after the level raising processing and output it to the main control module.

4. The electrical stimulation device according to claim 3, characterized in that The main control module is equipped with a PID controller, and is used to obtain the preparation parameters, the bipolar signal and the electromyographic signal, and to track and adjust the bipolar signal output by the electrical stimulation signal output module.

5. The electrical stimulation device according to claim 3, characterized in that It also includes a screen display module, a button and a peripheral indicator light module connected to the main control module.

6. The electrical stimulation device according to claim 3, characterized in that It also includes a touch display module connected to the main control module.

7. The electrical stimulation device according to claim 3, characterized in that It also includes a data storage module connected to the main control module.

8. The electrical stimulation device according to claim 3, characterized in that It also includes an expansion interface module connected to the main control module.

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