Method, circuit for preventing radio frequency microneedle motor from shaking and radio frequency microneedle treatment device

Abstract

The application discloses a method, circuit and radio frequency microneedle treatment equipment for preventing radio frequency microneedle motor from shaking, the method comprising: collecting current data of the microneedle motor when radio frequency is output; extracting current characteristic data related to the running state of the microneedle motor from the current data; detecting whether current impact exists in the current characteristic data; if the current impact exists, it is determined that the change of load impedance causes the driving current of the microneedle motor to be in an abnormal state; and adjusting the driving current when the driving current is in the abnormal state to make the microneedle motor run stably. The current data of the microneedle motor is collected and processed to obtain current characteristic data, whether current impact exists in the current characteristic data is detected, the driving current is adjusted according to the detection result, the microneedle motor runs stably, the change of the driving current caused by the change of load impedance is avoided, the microneedle motor does not shake abnormally, and the treatment effect of the radio frequency microneedle is not affected.

Description

Technical Field

[0001] This invention relates to the field of radiofrequency therapy technology, and in particular to a method, circuit, and radiofrequency microneedle therapy device for preventing motor vibration in radiofrequency microneedles. Background Technology

[0002] In radiofrequency microneedling treatment, the electrodes are the output terminals of radiofrequency energy. The high-frequency alternating current generated by the radiofrequency generator is conducted to the microneedles through the electrodes, and then the energy is released into the skin tissue. This energy transfer can precisely target specific layers of the skin, typically the dermis. The microneedles reach the dermis through a smart motor integrated with the microneedle electrodes; its design, including length and position output, helps determine the depth of insertion into the skin.

[0003] Motor vibration makes it difficult to precisely control the depth and angle at which radiofrequency microneedles are inserted into the skin. During radiofrequency microneedling treatment, the microneedles need to be precisely inserted into specific layers of the skin, such as the dermis, to achieve the best therapeutic effect. Vibration can cause the microneedles to be inserted too deeply or too superficially. Too deep insertion may damage subcutaneous tissue, blood vessels, and nerves, causing bleeding, increased pain, and even scarring; too shallow insertion may fail to effectively stimulate the target tissue, affecting the treatment outcome. Furthermore, motor vibration can cause unstable contact between the microneedles and the skin, leading to uneven distribution of radiofrequency energy. This may result in some areas receiving excessive energy, causing burns, redness, swelling, and blisters; while other areas may receive insufficient energy, failing to achieve the desired therapeutic effect, such as skin tightening or pore reduction. Summary of the Invention

[0004] The main objective of this invention is to propose a method, circuit, and radiofrequency microneedle treatment device to prevent vibration of the radiofrequency microneedle motor, aiming to solve the problem of vibration caused by changes in the current and voltage of the microneedle motor due to changes in load impedance during radiofrequency microneedle treatment.

[0005] To achieve the above objectives, the present invention proposes a method for preventing radio frequency microneedle motor jitter, the method comprising:

[0006] During radio frequency output, the current data of the microneedle motor is collected;

[0007] Extract current feature data related to the operating status of the microneedle motor from the current data;

[0008] Detect whether there is a current surge in the current characteristic data;

[0009] If the aforementioned current surge exists, it is determined that the change in load impedance has caused the drive current of the microneedle motor to be in an abnormal state.

[0010] When the drive current is in an abnormal state, the drive current is adjusted to ensure stable operation of the microneedle motor.

[0011] In one embodiment, the step of acquiring current data of the microneedle motor during radio frequency output includes:

[0012] Real-time acquisition of impedance during RF output;

[0013] When a sudden change in impedance is detected, the current data of the microneedle motor is collected.

[0014] In one embodiment, the step of extracting current feature data related to the operating state of the microneedle motor from the current data includes:

[0015] Extract discrete current samples from the current data;

[0016] The processed current data is obtained by weighted summation of the discrete current samples.

[0017] Extract current feature data related to the operating status of the microneedle motor from the processed current data.

[0018] In one embodiment, the step of detecting whether there is a current surge in the current characteristic data includes:

[0019] Detect the current difference between the current value in each cycle and the current value in the previous cycle;

[0020] When the current difference is greater than the error difference, it is determined that there is a current surge in the current characteristic data.

[0021] The present invention also proposes a circuit for preventing radio frequency microneedle motor jitter, the circuit for preventing radio frequency microneedle motor jitter includes the method for preventing radio frequency microneedle motor jitter as described above, the circuit includes: a load impedance acquisition circuit, a main control circuit and a current sampling and adjustment circuit;

[0022] The main control circuit is connected to the load impedance acquisition circuit and the current sampling and adjustment circuit.

[0023] The load impedance acquisition circuit is used to acquire the impedance during RF output in real time.

[0024] The current sampling and adjustment circuit is used to collect the current data of the micro-needle motor when a sudden change in impedance is detected, and transmit it to the main control circuit.

[0025] The main control circuit is used to extract current characteristic data related to the operating state of the micro-needle motor from the current data, and detect whether there is a current surge in the current characteristic data; if there is a current surge, it is determined that the change in load impedance has caused the drive current of the micro-needle motor to be in an abnormal state.

[0026] The current sampling and adjustment circuit is also used to adjust the drive current when the drive current is in an abnormal state, so as to make the micro-needle motor run stably.

[0027] In one embodiment, the circuit for preventing radio frequency microneedle motor jitter further includes: a switching transistor driving circuit and a control circuit;

[0028] The control circuit is connected to the switching transistor drive circuit and the AC power supply, and the switching transistor drive circuit includes a switching transistor.

[0029] The control circuit is used to generate and send control signals to the drive circuit;

[0030] The switching transistor drive circuit is used to generate a control voltage based on the control signal and transmit it to the switching transistor. Under the control of the control voltage, the switching transistor periodically turns on and off to provide a stable drive current for the micro-needle motor and avoid the micro-needle motor from shaking due to transient load changes.

[0031] In one embodiment, the circuit for preventing radio frequency microneedle motor jitter further includes: a high-frequency transformer;

[0032] The high-frequency transformer is connected to the control circuit and the AC power supply;

[0033] The high-frequency transformer is used to isolate the input voltage and couple the input voltage to the control circuit.

[0034] In one embodiment, the circuit for preventing radio frequency microneedle motor jitter further includes: an input rectifier filter circuit and an output rectifier filter circuit;

[0035] The input rectifier and filter circuit is connected to the high-frequency transformer and the control circuit, and the output rectifier and filter circuit is connected to the switching transistor drive circuit and the micro-needle motor;

[0036] The input rectifier and filter circuit is used to convert the AC input voltage of the high-frequency transformer into a DC input voltage, filter the DC input voltage, and transmit the filtered DC input voltage to the control circuit.

[0037] The output rectifier and filter circuit is used to rectify and filter the voltage supplied to the micro-needle motor.

[0038] In one embodiment, the control circuit includes: a power driver chip, a first resistor, a second resistor, and a first capacitor;

[0039] The input terminal of the power driver IC is connected to the input rectifier and filter circuit. The first output port of the power driver IC is connected to the controller and one end of the first resistor. The other end of the first resistor is connected to the switching transistor driver circuit. The second output port of the power driver IC is connected to the controller and one end of the second resistor. The other end of the second resistor is connected to the switching transistor driver circuit. The third output port of the power driver IC is connected to one end of the first capacitor. The other end of the first capacitor is connected to the switching transistor driver circuit.

[0040] In one embodiment, the switching transistor driving circuit includes: a first MOSFET, a second MOSFET, and a sliding rheostat;

[0041] The gate of the first MOSFET is connected to the other end of the first resistor, the drain of the first MOSFET is connected to the first power supply, the source of the first MOSFET is connected to the other end of the first capacitor, the drain of the second MOSFET, the fixed end of the sliding rheostat, and the output rectifier and filter circuit, the gate of the second MOSFET is connected to the other end of the second resistor, and the source of the second MOSFET, the other fixed end of the sliding rheostat, and the control end of the sliding rheostat are grounded.

[0042] The present invention also proposes a radiofrequency microneedle therapy device, which includes the radiofrequency microneedle motor vibration prevention circuit described above.

[0043] This invention discloses a method, circuit, and radiofrequency microneedle therapy device for preventing vibration of a radiofrequency microneedle motor, relating to the field of radiofrequency therapy technology. The method for preventing vibration of a radiofrequency microneedle motor includes: collecting current data of the microneedle motor during radiofrequency output; extracting current characteristic data related to the operating state of the microneedle motor from the current data; detecting whether there is a current surge in the current characteristic data; if the current surge exists, it is determined that a change in load impedance has caused the drive current of the microneedle motor to be in an abnormal state; and adjusting the drive current when the drive current is in an abnormal state to ensure stable operation of the microneedle motor. By collecting and processing the current data of the microneedle motor to obtain current characteristic data, detecting whether there is a current surge in the current characteristic data, and adjusting the drive current according to the detection results, the stable operation of the microneedle motor is ensured, preventing abnormal vibration of the microneedle motor due to changes in load impedance, which would affect the therapeutic effect of radiofrequency microneedling. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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 the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0045] Figure 1 A schematic diagram of the current waveform of an embodiment of the method for preventing radio frequency microneedle motor jitter provided by the present invention;

[0046] Figure 2 A schematic diagram of the modules of the first embodiment of the method for preventing radio frequency microneedle motor jitter provided by the present invention;

[0047] Figure 3 This is a flowchart illustrating the first embodiment of the method for preventing radio frequency microneedle motor jitter provided by the present invention;

[0048] Figure 4 This is a flowchart illustrating the second embodiment of the method for preventing radio frequency microneedle motor jitter provided by the present invention.

[0049] Figure 5 A schematic diagram of a first embodiment of the circuit for preventing radio frequency microneedle motor jitter provided by the present invention;

[0050] Figure 6 A circuit diagram of the first embodiment of the anti-radio frequency microneedle motor jitter circuit provided by the present invention;

[0051] Figure 7 A schematic diagram of a second embodiment of the circuit for preventing radio frequency microneedle motor jitter provided by the present invention;

[0052] Figure 8 This is a circuit diagram of the third embodiment of the anti-radio frequency microneedle motor jitter circuit provided by the present invention.

[0053] Explanation of icon numbers:

[0054] label name label name 100 High frequency transformer 40 micro needle motor 200 Input rectifier filter circuit 500 Output rectifier filter circuit 300 control circuit 600 micro needle motor 400 Switching transistor drive circuit L1 inductance C sliding rheostat R1~R2 First to second resistors C1~C12 Capacitors 1 to 12 U1 High frequency transformer Q1~Q2 First to second MOSFETs 10 Load impedance acquisition circuit VCC1 First power supply 20 Main control circuit 30 Current sampling and regulation circuit

[0055] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0056] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0057] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0058] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0059] In radiofrequency microneedling treatment, the electrodes are the output terminals of the radiofrequency energy. After the radiofrequency microneedles are inserted into the target tissue, the high-frequency alternating current generated by the radiofrequency generator is conducted to the microneedles through the electrodes, and then the energy is released into the skin tissue. This energy transfer can precisely target specific layers of the skin, generally the dermis. The microneedles can reach the dermis through the integration of a smart motor with the microneedle electrodes. Designs such as length and position output help the microneedles insert into the skin to reach the precise depth.

[0060] Vibration of the microneedle motor makes it difficult to precisely control the depth and angle of insertion of the radiofrequency microneedles into the skin. During radiofrequency microneedling treatment, the microneedles need to be precisely inserted into specific layers of the skin, such as the dermis, to achieve the best therapeutic effect. Vibration can cause the microneedles to be inserted too deeply or too superficially. Insertion that is too deep may damage subcutaneous tissue, blood vessels, and nerves, causing bleeding, increased pain, and even scarring; insertion that is too superficial may fail to effectively stimulate the target tissue, affecting the treatment outcome. Furthermore, vibration of the microneedle motor can cause unstable contact between the microneedle and the skin, leading to uneven distribution of radiofrequency energy. This may result in some areas receiving excessive energy, causing burns, redness, swelling, and blisters; while other areas may receive insufficient energy, failing to achieve the desired therapeutic effect, such as skin tightening or pore reduction.

[0061] Therefore, we need to ensure that the motor remains stable throughout the treatment process, without any shaking, deviation, or movement.

[0062] Existing approaches include, on the one hand, structural shock absorption by installing rubber shock-absorbing pads at the bottom of the microneedle motor device. These pads effectively absorb and buffer vibrations from both internal and external sources, reducing the impact on operation and the electrical circuitry of the motor. On the other hand, improving the mechanical stability of the microneedle electrodes involves designing more robust microneedle fixation devices. High-precision mechanical clamps are used to secure the microneedles, reducing their movement during treatment. Simultaneously, the connection structure between the motor and the microneedle is optimized to ensure a smooth power transmission from the motor to the microneedle.

[0063] Radio frequency (RF) microneedles consume electrical energy when outputting RF signals. Changes in power during startup or operation can cause fluctuations in the power supply voltage. Since the microneedle motor and the RF microneedle share the same power supply, these voltage fluctuations can destabilize the motor's input voltage, affecting its torque output and speed stability, leading to motor vibration. Therefore, it is crucial to ensure the stability of the motor's power supply, guaranteeing that sudden power surges during high-power RF output do not interfere with the motor's power supply and cause vibration.

[0064] The motor and RF transmitter share a common power supply circuit. Sudden DC current changes in the RF transmitter can affect the power supply to the micro-needle motor. During RF operation, changes in load impedance can increase the reflection coefficient of the RF output power, leading to impedance mismatch with the RF transmitter. Because of the increased reflection coefficient, the power output increases, resulting in significant interference ripple in the RF transmitter power supply. Therefore, changes in load impedance can affect motor vibration.

[0065] Because both the RF transmitter and the motor operate on DC power, electromagnetic isolation cannot isolate DC. DC isolation typically uses inductor-based filtering circuits. However, due to the high frequency of the RF output, the range of interference frequencies it carries is also high. The frequency range filtered by inductors and similar devices cannot completely cover this interference frequency range, and their effectiveness is insufficient to completely eliminate power supply interference caused by the RF output. Therefore, additional auxiliary circuit techniques are needed to solve this interference problem.

[0066] In radiofrequency microneedling devices, the microneedle motor is the key component driving the microneedles. When the load impedance changes, the torque balance of the microneedle motor is disrupted according to its operating principle. The output torque of the microneedle motor and the load torque must remain balanced for stable operation. Changes in load impedance cause changes in the load current, which in turn affects the electromagnetic torque of the microneedle motor.

[0067] In a simple DC microneedle motor model, the motor torque T = KI (where K is the torque constant and I is the armature current). When the load impedance decreases, the load current increases, causing a sudden increase in the electromagnetic torque of the microneedle motor, thus accelerating the motor. Conversely, when the load impedance increases, the load current decreases, the electromagnetic torque of the microneedle motor decreases, and the microneedle motor may decelerate. This sudden change in speed manifests as vibration in the microneedle motor.

[0068] Firstly, different tissues in the human body have different electrical properties. During radiofrequency microneedling treatment, the load impedance changes significantly when the microneedles are inserted into different tissue layers. Furthermore, the energy output of the radiofrequency microneedles causes tissue denaturation and other biological characteristics, thus greatly affecting the tissue impedance. Secondly, during treatment, slight movements by the patient or muscle contractions may cause changes in the contact area and pressure between the microneedles and the tissue. According to the formula for contact resistance, R = pL / S (where p is resistivity, L is the current path length, and S is the contact area), changes in the contact area will cause changes in contact resistance, and contact resistance is a component of the load impedance.

[0069] like Figure 1 As shown in the oscilloscope graph, channel 1 represents the waveform of the microneedle motor's operating current, and channel 2 represents the RF output waveform. Extensive analysis reveals that the microneedle motor generates a driving current simultaneously with RF operation, resulting in subtle vibrations in the microneedle motor during RF output. Therefore, we can conclude that changes in load impedance during treatment alter the microneedle motor current, causing vibrations in the RF microneedle.

[0070] Therefore, this application employs a current data acquisition circuit for preventing RF micro-needle motor jitter to determine whether there is a sudden abnormal power supply, and filters the power signal through a feedback judgment method. The circuit for preventing RF micro-needle motor jitter provides a stable motor power supply circuit, which is not affected by external abnormal interference, has strong anti-interference capabilities, and can stably and continuously output power.

[0071] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or a digital signal processor capable of performing the above functions. The following description uses a digital signal processor (DSP) as an example to illustrate this embodiment and the subsequent embodiments.

[0072] Based on this, the embodiments of this application provide a method for preventing the vibration of a radio frequency microneedle motor, referring to... Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the modules in the first embodiment of the method for preventing radio frequency microneedle motor jitter according to this application. Figure 3 This is a flowchart illustrating the first embodiment of the method for preventing radio frequency microneedle motor jitter in this application.

[0073] It is understandable that, such as Figure 3 As shown, the method for preventing radio frequency microneedle motor vibration includes steps S10 to S50.

[0074] It should be noted that, as Figure 2 As shown, the host power control system provides power to the RF output module and the main control circuit. After the RF output, the load impedance changes, resulting in a difference in impedance matching the RF output, causing impedance mismatch. Simultaneously, the main control circuit is connected to a load impedance sampling circuit. Upon detecting this transient impedance change, the main control circuit controls the RF output module to adjust the RF output to optimize the RF treatment effect. This adjustment causes fluctuations in the power supply current, resulting in minor power supply anomalies.

[0075] A current sampling and regulation circuit is added to the back end of the main control circuit to balance the load. Since changes in load impedance directly lead to changes in current, when the feedback control system (Digital Signal Processing, DSP) of the current sampling and regulation circuit detects current fluctuations exceeding the set range, the DSP feedback control system adjusts the motor drive current through algorithms such as data filtering, data analysis and feature extraction, comparison with preset thresholds, fault diagnosis, and control strategy selection to eliminate the impact of load impedance changes.

[0076] Step S10: During RF output, collect the current data of the microneedle motor.

[0077] Understandably, during RF output, current data of the micro-needle motor is collected, including average current, peak current, current fluctuation, and current waveform. At the same time, in order to remove possible noise interference, the collected current data is filtered to obtain processed current data, which makes it more smoothly and accurately reflect the actual current of the motor.

[0078] Step S20: Extract current characteristic data related to the operating state of the micro-needle motor from the current data.

[0079] Understandably, further analysis of the processed current data is necessary to extract characteristic information related to the motor's operating status. This includes calculating statistical characteristics such as the average, effective, and peak values ​​of the current, and observing the trends in current data (whether there are sudden changes, fluctuation frequencies, etc.). These current characteristic data will help determine whether the motor is operating normally and whether it is affected by factors such as changes in load impedance.

[0080] Step S30: Detect whether there is a current surge in the current characteristic data.

[0081] Understandably, the extracted current characteristic data is tested to determine whether these current characteristic data are within the normal operating range of the motor and the expected performance index range, and whether the current characteristic data contain brief and severe peak characteristics, i.e., current surges.

[0082] Step S40: If the current surge exists, it is determined that the change in load impedance has caused the drive current of the micro-needle motor to be in an abnormal state.

[0083] Understandably, fault diagnosis is based on electrical detection results. If the current characteristic data remains within the normal operating range of the motor, it indicates that the microneedle motor is currently operating normally, and the current microneedle motor drive state is maintained, with continuous data acquisition and monitoring. If current characteristic data shows a current surge, it is determined that a change in load impedance is causing an abnormality in the drive current of the microneedle motor, resulting in motor vibration.

[0084] It should be noted that when the main control system occasionally detects impedance anomalies, or misjudges impedance anomalies, and the host power control system receives an impedance mismatch signal, the radio frequency output becomes abnormal. This causes the microneedle motor to generate a jumpy DC current, which interferes with the drive current. The drive current is not the radio frequency current used for treatment, but rather the DC current that normally powers each module. This sudden change in drive current will disrupt the motor's normal operation, causing a torque imbalance. A sudden increase or decrease in drive current will alter the electromagnetic torque of the microneedle motor, potentially causing it to accelerate or decelerate. This sudden change in speed manifests as motor vibration.

[0085] Step S50: When the drive current is in an abnormal state, adjust the drive current to make the micro-needle motor run stably.

[0086] It should be noted that the microneedle motor current can be adjusted to return to the normal range, thus achieving stable operation of the microneedle motor. By controlling and adjusting the drive current, the stable operation of the microneedle motor is ensured, preventing abnormalities in the radiofrequency motor caused by changes in load impedance, which could affect the treatment effect of radiofrequency microneedling.

[0087] In this embodiment, current data of the microneedle motor is collected and processed to obtain current characteristic data. The presence of current surges in the current characteristic data is detected. When a current surge is detected, the drive current is adjusted to ensure stable operation of the microneedle motor. The drive current is not affected by changes in load impedance, which could cause abnormal vibration of the microneedle motor and thus affect the therapeutic effect of radiofrequency microneedling.

[0088] like Figure 4 The diagram shown is a flowchart of the second embodiment of the method for preventing radio frequency microneedle motor jitter proposed in this embodiment.

[0089] Based on the first embodiment described above, a second embodiment of the method for preventing radio frequency microneedle motor vibration of the present invention is proposed.

[0090] Step S201: Real-time acquisition of impedance during RF output.

[0091] Understandably, the load impedance acquisition circuit acquires the impedance of the RF output in real time. In the RF field, impedance is a physical quantity that describes the resistance of a circuit or component to alternating current; it includes the effects of resistance (R), inductance (L), and capacitance (C). Impedance is usually expressed in complex form, i.e., Z = R + jX, where R is the resistive part and X is the reactive part (j is the imaginary unit). Impedance matching is crucial for achieving maximum power transfer in RF systems. Power transfer efficiency is highest when the source impedance and load impedance are conjugate matched. Impedance mismatch can cause signal reflection, increase system losses, and even cause oscillations, affecting system stability. Impedance mismatch can also lead to signal distortion and affect signal quality, especially in high-speed, high-frequency applications.

[0092] Step S202: When a sudden change in impedance is detected, the current data of the microneedle motor is collected.

[0093] It should be noted that impedance surges during radio frequency output can be caused by various factors, such as load changes, component failures, or loose connections. These surges can directly affect system performance and even damage the equipment. Upon detecting impedance surges, it is crucial to promptly collect the microneedle motor's current data, analyze the cause of the fault, and make necessary adjustments to prevent abnormal drive current in the microneedle motor, which could lead to motor vibration and thus affect treatment efficacy.

[0094] Step S203: Extract discrete current samples from the current data.

[0095] Step S204: Perform a weighted summation on the discrete current samples to obtain the processed current data.

[0096] It should be noted that the filtering is achieved by collecting discrete current samples input to the micro-needle motor and then performing a weighted summation on these discrete current samples. For an FIR filter of length N, its output y(n) is the convolution of the input signal x(n) and the filter coefficients h(k), and the relationship between its output and input is as follows:

[0097]

[0098] Where n is the discrete-time index, representing the current time; N is the filter order, which determines the length of the filter; h(k) are the filter coefficients, which determine the frequency response characteristics of the filter; and x(nk) are the delayed samples of the input signal.

[0099] Understandably, the above data filtering algorithm can filter the received current data. Based on the set filter coefficients, a convolution operation is performed on the acquired current data sequence to obtain the processed current data. In data acquisition systems, FIR filters can be used for signal preprocessing and filtering to improve data accuracy and reliability. They help remove noise and interference from the data, retaining useful information and providing a foundation for subsequent data analysis and processing.

[0100] Step S205: Extract current feature data related to the operating status of the micro-needle motor from the processed current data.

[0101] It should be noted that further analysis of the processed current data is necessary to extract current characteristic data related to the motor's operating status. This includes calculating the average value, effective value, peak value, and other statistical characteristics of the current, as well as observing the trend of current data changes (whether there are sudden changes, fluctuation frequencies, etc.). These characteristics help determine whether the motor is in normal operating condition and whether it is affected by factors such as changes in load impedance.

[0102] Step S206: Detect the current difference between the current value in each cycle and the current value in the previous cycle.

[0103] Understandably, accurately detecting the difference between the current value in each cycle and the current value in the previous cycle is necessary to analyze the trend and stability of current changes.

[0104] Based on the system's operating frequency or a specific time interval, the current characteristic data is divided into different periods. The difference between the current value in each period and the current value in the previous period is calculated. For each period, the current value (which can be the average value, peak value, or other characteristic value) is extracted, and the difference between the current value in that period and the current value in the previous period is calculated.

[0105] Step S207: When the current difference is greater than the error difference, it is determined that there is a current surge in the current characteristic data.

[0106] It should be noted that by monitoring the current difference, it is possible to promptly detect current surges in the current characteristic data, thereby determining whether the drive current of the microneedle motor is in an abnormal state. Analyzing the trend of the current difference, when the current difference exceeds the error difference, a safety protection mechanism can be triggered, indicating the presence of a current surge in the current characteristic data and determining that a change in load impedance is causing the drive current of the microneedle motor to be in an abnormal state. The drive current is then adjusted to ensure stable operation of the microneedle motor.

[0107] Optionally, the processing method for the current data can be improved, such as by using Butterworth low-pass filters, Butterworth high-pass filters, etc., in the data filtering process.

[0108] In this embodiment, the collected current data is filtered to remove potential noise interference. Based on the set filter coefficients, the collected current data sequence is convolved to obtain filtered current data. The filtered current data is further analyzed to extract current characteristic data related to the motor's operating state, including statistical features such as the average current, RMS value, and peak value, and to detect whether current surges exist in the current characteristic data. The current characteristic data is divided into different periods. The difference between the current value in each period and the current value in the previous period is calculated. When the current difference is greater than the error difference, a safety protection mechanism is triggered, indicating the presence of a current surge in the current characteristic data. If a current surge exists, it is determined that the load impedance change has caused the drive current of the micro-needle motor to be in an abnormal state, and the micro-needle motor may experience vibration. The drive current is then quickly adjusted to stabilize the micro-needle motor.

[0109] This application also provides an RF microneedle motor jitter circuit; please refer to... Figure 5 The schematic diagram of the first embodiment of the circuit for preventing vibration of radio frequency microneedle motors proposed in this application is shown.

[0110] The circuit for preventing radio frequency microneedle motor jitter is used to perform the above-described method for preventing radio frequency microneedle motor jitter.

[0111] The circuit for preventing RF microneedle motor jitter includes: a load impedance acquisition circuit 10, a main control circuit 20, and a current sampling and adjustment circuit 30; the main control circuit 20 is connected to the load impedance acquisition circuit and the current sampling and adjustment circuit; the load impedance acquisition circuit 10 is used to acquire the impedance during RF output in real time.

[0112] The current sampling and adjustment circuit 30 is used to collect the current data of the micro-needle motor when a sudden change in impedance is detected, and transmit it to the main control circuit.

[0113] The main control circuit 20 is used to extract current characteristic data related to the operating state of the micro-needle motor from the current data, and detect whether there is a current surge in the current characteristic data; if there is a current surge, it is determined that the change in load impedance causes the drive current of the micro-needle motor to be in an abnormal state.

[0114] The current sampling and adjustment circuit 30 is also used to adjust the drive current when the drive current is in an abnormal state, so as to make the micro needle motor 40 run stably.

[0115] The main control circuit 20 is also used to extract discrete current samples from the current data; perform weighted summation on the discrete current samples to obtain processed current data; and extract current feature data related to the operating state of the micro-needle motor from the processed current data.

[0116] The main control circuit 20 is also used to detect the current difference between the current value in each cycle and the current value in the previous cycle; when the current difference is greater than the error difference, it is determined that there is a current surge in the current characteristic data.

[0117] It should be noted that, as Figure 6 As shown, the main control circuit 20 includes an MCU (microcontroller unit) and an FPGA (field programmable gate array), the current sampling and adjustment circuit 30 includes an AC power supply, a transformer, a rectifier filter circuit and a DC-DC adjustable circuit, and the load impedance acquisition circuit includes a voltage coil, a current coil, a load impedance and an operational amplifier integrated circuit.

[0118] It is understandable that the MCU output pulse width modulation (PWM) of the main control circuit 20 controls the adjustable DC-DC circuit, and the adjustable DC-DC circuit outputs drive current to drive the micro-needle motor.

[0119] In this embodiment, the radiofrequency microneedle motor vibration prevention circuit provided by this application employs the radiofrequency microneedle motor vibration prevention method described in the above embodiments, which can solve the problem of vibration caused by changes in the current and voltage of the microneedle motor due to changes in load impedance during radiofrequency microneedle treatment. Compared with the prior art, the beneficial effects of the radiofrequency microneedle motor vibration prevention circuit provided by this application are the same as those of the radiofrequency microneedle motor vibration prevention method provided in the above embodiments, and other technical features in the radiofrequency microneedle motor vibration prevention circuit are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0120] To address the issue of vibration caused by changes in the current and voltage of the microneedle motor due to variations in load impedance during radiofrequency microneedling therapy, this application further optimizes the circuit for preventing radiofrequency microneedle motor vibration. This application also proposes another circuit for preventing radiofrequency microneedle motor vibration.

[0121] like Figure 7 The diagram shows a module schematic of the second embodiment of the anti-radio frequency micro-needle motor jitter circuit proposed in this application. One end of the anti-radio frequency micro-needle motor jitter circuit in this embodiment is connected to the current sampling and adjustment circuit 30, and the other end is connected to the micro-needle motor 40.

[0122] Understandably, high-performance microneedle motor drivers offer superior dynamic response and current regulation capabilities. They feature wide-range voltage and current regulation and can achieve smooth operation under complex load conditions. These drivers are used in radiofrequency microneedle therapy devices to effectively reduce motor jitter. Power supply voltage fluctuations affect the performance of microneedle motors, especially when load impedance changes; unstable power supplies exacerbate microneedle motor jitter. Therefore, we incorporated a circuit to prevent radiofrequency microneedle motor jitter at the back end of the acquisition and control system.

[0123] The circuit for preventing RF microneedle motor jitter includes: a switching transistor drive circuit 400 and a control circuit 300; the control circuit is connected to the switching transistor drive circuit and an AC power supply, and the switching transistor drive circuit includes a switching transistor; the control circuit 300 is used to generate and send control signals to the drive circuit; the switching transistor drive circuit 400 is used to generate a control voltage according to the control signal and transmit it to the switching transistor, and the switching transistor periodically turns on and off under the control of the control voltage to provide a stable drive current for the microneedle motor and avoid microneedle motor jitter caused by transient load changes.

[0124] It should be noted that the control circuit uses PWM control. By comparing the output voltage feedback signal and the reference voltage signal, an error signal is output through an error amplifier. This error signal is then compared with a fixed-frequency triangular wave signal to generate a PWM signal, which serves as the control signal and is transmitted to the switching transistor drive circuit. A PWM signal, or Pulse Width Modulation signal, is a digital signal that controls the average value by changing the pulse width. In a PWM signal, a switch continuously switches on and off at extremely high frequencies (such as several kilohertz or even higher). The ratio of the switch's on time to the total cycle time is called the duty cycle, usually expressed as a percentage. By adjusting the duty cycle, i.e., adjusting the switch's on time, the average voltage or current of the signal can be changed.

[0125] Understandably, the switching transistor periodically turns on and off under the control of the switching transistor driver circuit. The switching transistor driver circuit generates a suitable control voltage based on the control signal, enabling the switching transistor to operate quickly and stably, and to turn on and off rapidly at high frequencies.

[0126] The circuit for preventing radio frequency microneedle motor jitter also includes: a high-frequency transformer 100; the high-frequency transformer is connected to the control circuit and the AC power supply; the high-frequency transformer 100 is used to isolate the input voltage and couple the input voltage to the control circuit.

[0127] Understandably, the high-frequency transformer 100 is used to achieve electrical isolation between the input and output, and can also change the voltage magnitude according to the turns ratio. Under the action of the switching transistor, the high-frequency transformer 100 couples the input pulse voltage to the secondary winding, and obtains the required AC input voltage on the secondary winding.

[0128] The circuit for preventing RF microneedle motor jitter further includes: an input rectifier and filter circuit 200 and an output rectifier and filter circuit 500; the input rectifier and filter circuit is connected to the high-frequency transformer 100 and the control circuit 300, and the output rectifier and filter circuit 500 is connected to the microneedle motor 600; the input rectifier and filter circuit 200 is used to convert the AC input voltage of the high-frequency transformer into a DC input voltage, filter the DC input voltage, and transmit the filtered DC input voltage to the control circuit; the output rectifier and filter circuit 500 is used to rectify and filter the voltage supplied to the microneedle motor.

[0129] Understandably, the input rectifier filter circuit primarily converts the input AC power into DC power and filters it to remove the AC component. It typically includes a rectifier bridge (composed of four diodes) and filter capacitors. The rectifier bridge flips the negative half-cycle of the AC power to the positive half-cycle, converting the output to DC. The filter capacitors utilize their energy storage characteristics to smooth the rectified voltage, reducing voltage ripple. Both the input rectifier filter circuit 200 and the output rectifier filter circuit 500 use large-capacity capacitors, with capacitance values ​​in the microfarad (μF) or even millifarad (mF) range. These large-capacity capacitors effectively filter out low-frequency noise and ripple, providing a stable DC voltage.

[0130] It should be noted that the output rectifier and filter circuit 500 rectifies and filters the pulse voltage after passing through the inductor, converting it into a stable DC drive voltage.

[0131] In this embodiment, the circuit for preventing radiofrequency microneedle motor jitter consists of: an input rectifier and filter circuit, an output rectifier and filter circuit, a switching transistor drive circuit, a control circuit, an inductor, and a high-frequency transformer. The control circuit generates a PWM control signal, which is sent to the switching transistor drive circuit. The switching transistor drive circuit generates an appropriate control voltage based on the control signal, enabling the switching transistor to operate quickly and stably, rapidly turning on and off at high frequencies. Through the above-mentioned control and adjustment of the switching transistor, the driving voltage of the microneedle motor power supply is ensured to be stable, preventing abnormal motor operation caused by changes in load impedance, thus affecting the therapeutic effect of radiofrequency microneedles.

[0132] like Figure 8 The diagram shown is a circuit diagram of the third embodiment of the method for preventing radio frequency microneedle motor jitter proposed in this embodiment.

[0133] Based on the second embodiment described above, a third embodiment of the method for preventing radio frequency microneedle motor vibration of the present invention is proposed.

[0134] The control circuit 300 includes: a power driver chip, a first resistor R1, a second resistor R2, and a first capacitor C1; the input terminal of the power driver IC is connected to the input rectifier and filter circuit 200, the first output port of the power driver IC is connected to the controller and one end of the first resistor R1, the other end of the first resistor R1 is connected to the switch driver circuit 400, the second output port of the power driver IC is connected to the controller and one end of the second resistor R2, the other end of the second resistor R2 is connected to the switch driver circuit 400, the third output port of the power driver IC is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is connected to the switch driver circuit 400.

[0135] Understandably, the control circuit 300 adjusts the duty cycle of the PWM signal based on factors such as the DC input and the set output voltage value. The switching transistor drive circuit boosts the power and level of the PWM signal to a range suitable for the switching transistor's operation, ensuring that the switching transistor can respond to the control signal quickly and accurately, achieving turn-on and turn-off operations.

[0136] Specifically, the control circuit 300 is Figure 6 The MCU and DC-DC adjustable circuit, wherein the MCU in the main control circuit 30 is... Figure 8 The controller of the main control circuit.

[0137] The switching transistor driving circuit 400 includes: a first MOSFET Q1, a second MOSFET Q2, and a sliding rheostat C; the gate of the first MOSFET Q1 is connected to the other end of the first resistor R1, the drain of the first MOSFET Q1 is connected to the first power supply, the source of the first MOSFET Q1 is connected to the other end of the first capacitor, the drain of the second MOSFET Q2, the fixed end of the sliding rheostat, and the output rectifier and filter circuit, the gate of the second MOSFET Q2 is connected to the other end of the second resistor, and the source of the second MOSFET Q3, the other fixed end of the sliding rheostat, and the control end of the sliding rheostat are grounded.

[0138] It should be noted that the switching transistor is connected to the inductor L1 of the output rectifier filter circuit. When the switching transistor is on, the DC input voltage Vin is directly applied to the inductor L1. At this time, the inductor current increases linearly, and the inductor stores energy. Its voltage VL = Vin - Vout, where Vout is the driving voltage input to the micro-needle motor. Simultaneously, the capacitor of the output rectifier filter circuit discharges to the micro-needle motor to maintain the stability of the driving voltage. When the switching transistor is off, the inductor generates a self-induced electromotive force, and the inductor releases energy. At this time, the inductor current flows to the capacitor of the output rectifier filter circuit and the micro-needle motor, the inductor voltage VL = -Vout, and the inductor current decreases linearly. The MCU control circuit generates a pulse width modulation (PWM) signal. A PWM signal is a pulse signal with a fixed frequency but an adjustable pulse width (i.e., duty cycle).

[0139] Specifically, the switching transistors are a first MOSFET Q1 and a second MOSFET Q2. When the PWM signal is high, after amplification by the switching transistor drive circuit, sufficient voltage is supplied to the gate of the switching transistor, turning it on. When the PWM signal becomes low, the gate of the switching transistor loses its control voltage, and the switching transistor is turned off. When the switching transistor is on, the DC input voltage is applied to the inductor, and the inductor current rises linearly, storing energy. When the switching transistor is off, the inductor discharges to the micro-needle motor through the capacitor, maintaining the drive current and drive voltage of the micro-needle electrode. By adjusting the duty cycle of the PWM signal, the on and off states of the switching transistors can be controlled, thus regulating the DC output voltage, which is always lower than the DC input voltage. After obtaining the DC output voltage, due to its large ripple, an output rectification and filtering circuit needs to be added at the back end to ensure the stability of the drive voltage.

[0140] Optionally, the high-frequency transformer U1 is connected to the input rectifier and filter circuit 200. The input rectifier and filter circuit includes a rectifier bridge, which includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. The input rectifier and filter circuit also includes a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C7. Among them, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 are polarized capacitors. The output rectifier and filter circuit 500 includes an inductor L1, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, and a twelfth capacitor C12. Among them, the eighth capacitor C8 and the ninth capacitor C9 are polarized capacitors.

[0141] Understandably, inductive filtering primarily utilizes the different impedance characteristics of inductors to DC and AC signals to achieve filtering. Inductors have low impedance to DC but high impedance to AC. Therefore, connecting an inductor in series in the output rectifier filter circuit can smooth the output current waveform, achieving better filtering with minimal DC loss. In the rectifier circuit, a capacitor is connected in parallel across the load. When the rectified voltage increases, the capacitor charges; when the rectified voltage decreases, the capacitor discharges to maintain the continuity and stability of the load current. The advantage of large capacitor filtering is its suitability for high-frequency circuits, and the filtering effect increases with increasing capacitance.

[0142] In this embodiment, the high-pressure transformer isolates the input AC power to obtain an AC input voltage. The input rectifier and filter circuit converts the AC input voltage into a DC input voltage and filters it. The control circuit outputs a PWM control signal based on the DC input voltage. The switching transistor drive module generates a suitable control voltage based on the PWM control signal and transmits it to the switching transistor. The switching transistor periodically turns on and off. By adjusting the duty cycle of the PWM control signal, the switching transistor can be controlled to adjust the DC output voltage. The DC output voltage is filtered by the output rectifier and filter circuit and then output to the micro-needle motor.

[0143] The present invention also proposes a radiofrequency microneedle therapy device, which includes a treatment host and the aforementioned circuit. The treatment host and the circuit are connected by a cable. The circuit includes a method for preventing the radiofrequency microneedle motor from vibrating. The specific structure of the method for preventing the radiofrequency microneedle motor from vibrating is as described in the above embodiments. Since the radiofrequency microneedle therapy device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0144] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for preventing vibration of a radio frequency microneedle motor, characterized in that, The method includes: During radio frequency output, the current data of the microneedle motor is collected; Extract current feature data related to the operating status of the microneedle motor from the current data; Detect whether there is a current surge in the current characteristic data; If the aforementioned current surge exists, it is determined that the change in load impedance has caused the drive current of the microneedle motor to be in an abnormal state. When the drive current is in an abnormal state, the drive current is adjusted to ensure stable operation of the microneedle motor.

2. The method for preventing radio frequency microneedle motor vibration as described in claim 1, characterized in that, The step of acquiring the current data of the microneedle motor during radio frequency output includes: Real-time acquisition of impedance during RF output; When a sudden change in impedance is detected, the current data of the microneedle motor is collected.

3. The method for preventing radio frequency microneedle motor vibration as described in claim 1, characterized in that, The step of extracting current feature data related to the operating state of the microneedle motor from the current data includes: Extract discrete current samples from the current data; The processed current data is obtained by weighted summation of the discrete current samples. Extract current feature data related to the operating status of the microneedle motor from the processed current data.

4. The method for preventing radio frequency microneedle motor vibration as described in claim 1, characterized in that, The step of detecting whether there is a current surge in the current characteristic data includes: Detect the current difference between the current value in each cycle and the current value in the previous cycle; When the current difference is greater than the error difference, it is determined that there is a current surge in the current characteristic data.

5. A circuit for preventing vibration of a radio frequency microneedle motor, characterized in that, The circuit is used to perform the method for preventing radio frequency microneedle motor jitter as described in any one of claims 1-4; the circuit includes: a load impedance acquisition circuit, a main control circuit, and a current sampling and adjustment circuit; The main control circuit is connected to the load impedance acquisition circuit and the current sampling and adjustment circuit. The load impedance acquisition circuit is used to acquire the impedance during RF output in real time. The current sampling and adjustment circuit is used to collect the current data of the micro-needle motor when a sudden change in impedance is detected, and transmit it to the main control circuit. The main control circuit is used to extract current characteristic data related to the operating state of the micro-needle motor from the current data, and detect whether there is a current surge in the current characteristic data; if there is a current surge, it is determined that the change in load impedance has caused the drive current of the micro-needle motor to be in an abnormal state. The current sampling and adjustment circuit is also used to adjust the drive current when the drive current is in an abnormal state, so as to make the micro-needle motor run stably.

6. The circuit for preventing radio frequency microneedle motor vibration as described in claim 5, characterized in that, The circuit for preventing radio frequency microneedle motor jitter also includes: a switching transistor drive circuit and a control circuit; The control circuit is connected to the switching transistor drive circuit and the AC power supply, and the switching transistor drive circuit includes a switching transistor. The control circuit is used to generate and send control signals to the drive circuit; The switching transistor drive circuit is used to generate a control voltage based on the control signal and transmit it to the switching transistor. Under the control of the control voltage, the switching transistor periodically turns on and off to provide a stable drive current for the micro-needle motor and avoid the micro-needle motor from shaking due to transient load changes.

7. The circuit for preventing radio frequency microneedle motor vibration as described in claim 6, characterized in that, The circuit for preventing radio frequency microneedle motor jitter also includes: a high-frequency transformer; The high-frequency transformer is connected to the control circuit and the AC power supply; The high-frequency transformer is used to isolate the input voltage and couple the input voltage to the control circuit.

8. The circuit for preventing radio frequency microneedle motor jitter as described in claim 7, characterized in that, The circuit for preventing radio frequency microneedle motor jitter also includes: an input rectifier filter circuit and an output rectifier filter circuit; The input rectifier and filter circuit is connected to the high-frequency transformer and the control circuit, and the output rectifier and filter circuit is connected to the switching transistor drive circuit and the micro-needle motor; The input rectifier and filter circuit is used to convert the AC input voltage of the high-frequency transformer into a DC input voltage, filter the DC input voltage, and transmit the filtered DC input voltage to the control circuit. The output rectifier and filter circuit is used to rectify and filter the voltage supplied to the micro-needle motor.

9. The circuit for preventing radio frequency microneedle motor vibration as described in claim 8, characterized in that, The control circuit includes: a power driver chip, a first resistor, a second resistor, and a first capacitor; The input terminal of the power driver IC is connected to the input rectifier and filter circuit. The first output port of the power driver IC is connected to the controller and one end of the first resistor. The other end of the first resistor is connected to the switching transistor driver circuit. The second output port of the power driver IC is connected to the controller and one end of the second resistor. The other end of the second resistor is connected to the switching transistor driver circuit. The third output port of the power driver IC is connected to one end of the first capacitor. The other end of the first capacitor is connected to the switching transistor driver circuit.

10. The circuit for preventing radio frequency microneedle motor vibration as described in claim 9, characterized in that, The switching transistor driving circuit includes: a first MOSFET, a second MOSFET, and a sliding rheostat; The gate of the first MOSFET is connected to the other end of the first resistor, the drain of the first MOSFET is connected to the first power supply, the source of the first MOSFET is connected to the other end of the first capacitor, the drain of the second MOSFET, the fixed end of the sliding rheostat, and the output rectifier and filter circuit, the gate of the second MOSFET is connected to the other end of the second resistor, and the source of the second MOSFET, the other fixed end of the sliding rheostat, and the control end of the sliding rheostat are grounded.

11. A radiofrequency microneedle therapy device, characterized in that, The radiofrequency microneedle therapy device includes a circuit for preventing radiofrequency microneedle motor vibration as described in any one of claims 5-10.

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