Real-time impedance-compensated low-interference skin anti-aging monopolar radio frequency device

Abstract

The present application belongs to the technical field of radio frequency skin anti-aging device, and discloses a real-time impedance compensation low-interference skin anti-aging monopolar radio frequency device, which comprises a radio frequency host, a treatment hand tool and a neutral electrode. A plurality of partitioned electrodes insulated from each other are arranged on the periphery of the main treatment electrode of the treatment hand tool, and the neutral electrode is provided with a plurality of reflux partitions insulated from each other. During the treatment pulse output period, the partitioned electrodes are connected to the protection drive unit; during the adjacent pulse interval, the partitioned electrodes are first disconnected from the protection drive unit, connected to the local detection unit after limiting and discharging through the protection discharge branch, so as to obtain the local interface impedance of each partition and the contact impedance of the reflux partition. The main loop sampling unit obtains the total equivalent impedance of the monopolar radio frequency loop. The compensation control unit determines the compensation requirement of the subsequent treatment pulse according to the total equivalent impedance, and controls the compensation execution in combination with the contact state of the treatment end and the reflux end, so as to limit or stop the radio frequency output when the contact is abnormal, and realize the time-sharing multiplexing of the protection and detection.

Description

Technical Field

[0001] This invention belongs to the technical field of radio frequency skin anti-aging devices, specifically a real-time impedance-compensated low-interference monopolar radio frequency skin anti-aging device. Background Technology

[0002] Monopolar radiofrequency skin rejuvenation devices typically deliver radiofrequency energy to the skin tissue via a treatment handpiece, and form a return path through neutral electrodes attached to other parts of the body. After the radiofrequency energy enters the skin tissue, tissue impedance, electrode contact area, coupling state, and output parameters all affect the local thermal effect. Therefore, existing radiofrequency cosmetic devices are usually equipped with temperature detection, impedance detection, or power adjustment modules to adjust the output state based on feedback signals during treatment.

[0003] In existing real-time impedance feedback schemes, a common approach is to acquire the voltage, current, or equivalent impedance in the RF output circuit and then adjust parameters such as RF frequency, output voltage, output power, and pulse duty cycle based on impedance changes. While this method can reflect overall load changes in the unipolar RF circuit, the total equivalent impedance in the unipolar RF circuit is not solely determined by the skin tissue condition: localized lifting of the treatment handpiece tip, insufficient local coupling medium, uneven pressing of the main treatment electrode edge, localized detachment of the neutral electrode, or changes in the return contact area can all manifest as changes in the total equivalent impedance. If the control system only uses the total equivalent impedance as the basis for compensation, output compensation is prone to occur simultaneously with contact abnormalities when the contact state changes, leaving subsequent treatment pulse output adjustments without a reliable contact state prerequisite.

[0004] Existing radiofrequency treatment heads also employ structures that improve electric field distribution through electrode shape, combinations of central and ring electrodes, or multi-electrode arrangements. However, these structures primarily focus on the morphology or energy distribution of the treatment electric field. Local contact status typically relies on overall impedance, temperature, or a single contact signal for judgment. When the treatment handpiece tilts or changes its contact during movement, the interface impedance at different locations of the treatment end is inconsistent. A single feedback signal cannot distinguish whether the change is due to a change in tissue impedance or a change in the local contact of the treatment end. Furthermore, the neutral electrode, as the return end of the unipolar radiofrequency circuit, also affects the circuit impedance due to its contact status. In actual use, the neutral electrode may exhibit local contact differences due to the curvature of the body surface, contact pressure, or edge lifting. These differences also affect the total equivalent impedance. If the feedback from the treatment end and the return end are not distinguished, the control system will struggle to determine the source of impedance changes, thus affecting the execution conditions of real-time impedance compensation. This can lead to compensation being performed or the predetermined output being maintained even when the contact status is abnormal, posing potential risks to treatment safety and efficacy stability. Summary of the Invention

[0005] The purpose of this invention is to provide a real-time impedance-compensated, low-interference monopolar radiofrequency skin anti-aging device. This device establishes total impedance compensation during monopolar radiofrequency treatment based on the contact state judgment between the treatment end and the return end. It also enables the partitioned electrodes at the front end of the treatment handpiece to participate in field protection and local impedance detection during the treatment pulse output and the interval between adjacent treatment pulses, thereby improving the problem of difficulty in distinguishing the source of impedance change when compensation is based solely on the total equivalent impedance of the monopolar radiofrequency circuit.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a real-time impedance-compensated low-interference skin anti-aging monopolar radiofrequency device, comprising a radiofrequency host, a treatment handpiece, and a neutral electrode. The treatment handpiece is provided with a main treatment electrode for forming a monopolar radiofrequency circuit with the neutral electrode through human tissue. The main treatment electrode is surrounded by three or more mutually insulated partition electrodes, and the neutral electrode is provided with two or more mutually insulated return current partitions. The radiofrequency host is provided with a radiofrequency output unit, an output adjustment unit, a main circuit sampling unit, a field driving unit, a local detection unit, a switching unit, and a compensation control unit.

[0007] The switching unit is used to connect the zoned electrodes to the protective field drive unit during treatment pulse output, placing them in a protective field state. During the interval between adjacent treatment pulses, the zoned electrodes are first disconnected from the protective field drive unit, and then connected to the local detection unit, placing them in a detection state. The main circuit sampling unit is used to acquire the total equivalent impedance of the unipolar radio frequency circuit, and the local detection unit is used to acquire the local interface impedance of each zoned electrode and the contact impedance of each return zone in the detection state. The compensation control unit is used to determine the compensation requirements of subsequent treatment pulses based on the total equivalent impedance, and to jointly determine the contact state based on the differences between local interface impedances and the differences between contact impedances. When the contact is normal, the compensation control unit controls the output adjustment unit to perform compensation; when the contact is abnormal, the compensation control unit prohibits positive compensation and limits or stops the radio frequency output.

[0008] Preferably, the switching unit includes a first switch group connected between the partition electrode and the protective field driving unit, a second switch group connected between the partition electrode and the local detection unit, and a protective discharge branch connected to the partition electrode; when switching from the treatment pulse output period to the interval of the adjacent treatment pulse, the first switch group is first turned off, the protective discharge branch discharges or limits the residual charge of the partition electrode within a preset protective interval, and the second switch group is then turned on.

[0009] Preferably, the protective field driving unit is connected to each zone electrode and applies a protective field signal to each zone electrode during the treatment pulse output. This protective field signal has the same frequency as the radio frequency signal of the main treatment electrode and a phase difference within a preset range. The amplitude of the protective field signal is not higher than the amplitude of the radio frequency signal of the main treatment electrode. The protective field driving unit includes a zone amplitude adjustment branch corresponding to each zone electrode. The compensation control unit generates a corresponding zone protective field adjustment amount based on the difference between the current local interface impedance and the initial local interface impedance of the corresponding zone electrode, so that the amplitude of the protective field signal applied to the zone electrode during the next treatment pulse decreases as the difference increases or remains unchanged.

[0010] Preferably, the partitioned electrodes include a first partitioned electrode, a second partitioned electrode, a third partitioned electrode, and a fourth partitioned electrode respectively disposed on the four sides of the main treatment electrode; an insulating isolation part is provided between the main treatment electrode and each partitioned electrode as well as between adjacent partitioned electrodes, and each partitioned electrode is fixedly disposed on the end mounting base at the front end of the treatment handpiece.

[0011] Preferably, the main circuit sampling unit includes a voltage sampling branch and a current sampling branch. The compensation control unit determines a stable sampling interval after the rising edge and before the falling edge of the treatment pulse, and determines the total equivalent impedance based on the corresponding voltage and current sampling values ​​within the stable sampling interval. The local detection unit includes a low-energy detection signal source, a multiplexing branch, and a synchronous demodulation branch. The multiplexing branch is used to sequentially apply the low-energy detection signal between a zone electrode and the main treatment electrode, and the synchronous demodulation branch is used to extract the response signal corresponding to the frequency of the low-energy detection signal.

[0012] Preferably, after the treatment handpiece is initially stably attached, the compensation control unit records the initial local interface impedance corresponding to each zone electrode, and forms a contact dispersion based on the change in the current local interface impedance of each zone electrode relative to the corresponding initial local interface impedance; when the contact dispersion does not exceed a preset dispersion threshold, the treatment end is determined to be in normal contact, and when the contact dispersion exceeds the preset dispersion threshold, the treatment end is determined to be in abnormal contact.

[0013] Preferably, the output adjustment unit is used to adjust any one or more parameters among the output voltage, pulse width, number of sub-pulses, sub-pulse interval, and output duty cycle of the treatment pulse; the compensation control unit allows the radio frequency output to be increased only when the contact is determined to be normal in multiple consecutive detection cycles, and limits the parameter adjustment amount in a single compensation cycle, and maintains, reduces or stops the radio frequency output when the contact dispersion is close to or exceeds the preset dispersion threshold.

[0014] Preferably, the front end of the treatment handpiece is provided with an end mounting seat and a floating support seat. The main treatment electrode is mounted on the floating support seat, and the partition electrodes are mounted on the end mounting seat. The end mounting seat is provided with a guide groove for the axial sliding of the floating support seat. An elastic reset member is provided between the floating support seat and the end mounting seat. The floating support seat is provided with a limiting rod, which is used to abut against the inner wall of the end mounting seat when the floating support seat retracts to a preset position, so as to limit the retraction stroke of the floating support seat. The main treatment electrode protrudes from the partition electrodes in the unpressurized state, and retracts with the floating support seat to be substantially coplanar with the partition electrodes after being pressed. After the main treatment electrode reaches the preset retraction position, the local detection unit establishes the initial local interface impedance of each partition electrode.

[0015] Preferably, if the treatment handpiece fails to establish a stable initial local interface impedance for each zone electrode within a preset time, the compensation control unit determines that the treatment handpiece has not formed an effective pressing state and prohibits radio frequency output.

[0016] Preferably, the recirculation zone includes a first recirculation zone and a second recirculation zone. The first recirculation zone and the second recirculation zone together form a radiofrequency recirculation end during the treatment pulse output, and are respectively connected to local detection units during the interval between adjacent treatment pulses. The compensation control unit determines that the overall contact abnormality exists when both the treatment end contact abnormality and the recirculation end contact abnormality exist simultaneously and stops the radiofrequency output. When only the treatment end contact abnormality or the recirculation end contact abnormality exists, it determines that the local contact abnormality exists and maintains or reduces the radiofrequency output.

[0017] The beneficial effects of this invention are as follows: 1. This invention combines total equivalent impedance compensation of a unipolar radio frequency circuit with the judgment of the contact status of the treatment end and the return end: the total equivalent impedance is used to determine whether there is a compensation requirement for subsequent treatment pulses, and the local interface impedance differences of the electrodes in each zone of the treatment end and the contact impedance differences of each return zone of the return end are used together to judge the contact status at both ends. Output compensation is no longer directly executed based solely on the overall impedance change of the circuit, but is only allowed to be executed when the contact status of both the treatment end and the return end is normal; when both the treatment end and the return end are abnormal at the same time, it is judged as an overall contact abnormality and the radio frequency output is stopped; when only one end is abnormal, it is judged as a local contact abnormality and the output is maintained or reduced. This makes real-time impedance compensation have clear and graded contact status prerequisites, avoiding the confusion between the source of total impedance change and contact abnormality.

[0018] 2. This invention enables the zoned electrodes to connect to the protective field driving unit during the treatment pulse output and to connect to the local detection unit during the interval between adjacent treatment pulses. The same group of zoned electrodes time-division multiplexes the protective field and detection functions, reducing the complexity of the front-end structure caused by additional detection electrodes. The switching process follows the sequence of first disconnecting from the protective field, then limiting and discharging residual charge through the protective discharge branch, and finally connecting to the detection unit. This allows the local detection process to bypass the treatment pulse output stage, reducing the interference of residual charge on the local interface impedance detection. Combined with the floating support structure of the fixed zoned electrodes and the axially movable main treatment electrode at the front end of the treatment handpiece, the establishment of the initial local interface impedance corresponds to the effective pressing state of the treatment handpiece, providing a repeatable mechanical reference for subsequent contact dispersion judgment.

[0019] 3. Based on the difference between the current local interface impedance of the partition electrode and the initial local interface impedance, the present invention adjusts the amplitude of the protective field signal of the corresponding partition during the next treatment pulse: when the difference increases, the amplitude of the protective field signal of the corresponding partition decreases or remains unchanged; when the difference falls back to within the recovery threshold, it recovers according to the preset step size, so that the protective field signal is no longer a fixed output, but forms a closed-loop correspondence with the local contact state, further improving the matching degree between the protective field effect and the actual contact state of the treatment end. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the treatment handpiece of the present invention; Figure 3 This is a partial explosion diagram of the treatment handpiece of the present invention; Figure 4 This is a schematic diagram of the electrode arrangement at the front end of the treatment handpiece of the present invention; Figure 5 This is a schematic diagram illustrating the functional connection between the radio frequency host and the treatment handpiece of the present invention; Figure 6 This is a schematic diagram of the partition electrode switching connection of the present invention; Figure 7 This is a schematic diagram of the timing relationship of the present invention; Figure 8 This is a schematic diagram of the neutral electrode structure and detection connection of the present invention; Figure 9 This is a block diagram showing the composition of the main circuit sampling unit, local detection unit, and return current partition of the present invention.

[0021] 1. Radiofrequency host; 2. Treatment handpiece; 3. Neutral electrode; 4. Connecting cable; 101. Radiofrequency output unit; 102. Output adjustment unit; 103. Main circuit sampling unit; 1031. Voltage sampling branch; 1032. Current sampling branch; 104. Protective field drive unit; 105. Local detection unit; 1051. Low-energy detection signal source; 1052. Multiplexing branch; 1053. Synchronous demodulation branch; 106. Switching unit; 1061. First switch group; 1062. Second switch group; 1063. Protection discharge branch; 107. Compensation control Unit; 201, Main treatment electrode; 202, Zone electrode; 2021, First zone electrode; 2022, Second zone electrode; 2023, Third zone electrode; 2024, Fourth zone electrode; 203, Insulating isolation part; 204, End mounting base; 205, Floating bearing base; 206, Guide groove; 207, Elastic reset element; 208, Limiting rod; 301, First return zone; 302, Second return zone; 303, Insulating separation part; 304, Common connection end; 305, First detection end; 306, Second detection end; A, Human body equivalent load. Detailed Implementation

[0022] 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 some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] The embodiments are described below with reference to the accompanying drawings. The specific structures, connection methods, signal timing, and judgment conditions in the embodiments are used to illustrate the implementation of the technical solution of this application and do not constitute a limitation on the scope of protection.

[0024] Reference Figures 1 to 9 A real-time impedance-compensated, low-interference monopolar radiofrequency skin anti-aging device includes a radiofrequency host 1, a treatment handpiece 2, a neutral electrode 3, and a connecting cable 4. The treatment handpiece 2 is connected to the radiofrequency host 1 via the connecting cable 4, and the neutral electrode 3 is connected to the radiofrequency host 1 via another connecting cable 4. A main treatment electrode 201 is disposed at the front end of the treatment handpiece 2, which serves as the monopolar radiofrequency output terminal. During treatment, the main treatment electrode 201 forms a monopolar radiofrequency circuit with the neutral electrode 3 through human tissue. The human tissue is represented by the human equivalent load A in the attached drawings, and the human equivalent load A is not part of the device.

[0025] The radio frequency (RF) host 1 includes an RF output unit 101, an output adjustment unit 102, a main circuit sampling unit 103, a field driving unit 104, a local detection unit 105, a switching unit 106, and a compensation control unit 107. The RF output unit 101 generates RF treatment signals. The output adjustment unit 102 is connected between the RF output unit 101 and the main treatment electrode 201, and is used to adjust the output voltage, pulse width, number of sub-pulses, sub-pulse interval, or output duty cycle of the treatment pulse according to the control commands of the compensation control unit 107. The main circuit sampling unit 103 is connected to the sampling position of the unipolar RF circuit, and is used to acquire voltage and current sampling values ​​during the treatment pulse output, and send the sampling results to the compensation control unit 107.

[0026] Reference Figure 9 The main circuit sampling unit 103 includes a voltage sampling branch 1031 and a current sampling branch 1032. The voltage sampling branch 1031 can employ a voltage divider sampling structure connected to the output terminal of the main treatment electrode 201, while the current sampling branch 1032 can employ a series sampling resistor, a current transformer, or a Hall current detection structure. The compensation control unit 107 selects a stable sampling interval after the rising edge and before the falling edge of the treatment pulse, and determines the total equivalent impedance of the unipolar radio frequency circuit based on the voltage and current sampling values ​​within the stable sampling interval. The stable sampling interval can be set in the middle period after the treatment pulse reaches a stable amplitude, avoiding transient fluctuations at the rising and falling edges of the pulse.

[0027] The field-protection driving unit 104 is connected to the switching unit 106. The field-protection driving unit 104 provides a field-protection signal to the zone electrodes 202 during the treatment pulse output. The field-protection signal is at the same frequency as the radio frequency signal of the main treatment electrode 201, and there is a preset phase difference between the field-protection signal and the radio frequency signal of the main treatment electrode 201. The amplitude of the field-protection signal is not higher than the amplitude of the radio frequency signal of the main treatment electrode 201. The field-protection driving unit 104 includes zone amplitude adjustment branches corresponding to each zone electrode 202. Each zone amplitude adjustment branch receives the zone field-protection adjustment amount given by the compensation control unit 107, so that different zone electrodes 202 can obtain field-protection signals of different amplitudes.

[0028] Reference Figure 9The local detection unit 105 includes a low-energy detection signal source 1051, a multiplexing branch 1052, and a synchronous demodulation branch 1053. The detection signal output by the low-energy detection signal source 1051 is lower than the treatment pulse energy and is used to perform interface impedance detection during the treatment pulse interval. The multiplexing branch 1052 sequentially selects the first partition electrode 2021, the second partition electrode 2022, the third partition electrode 2023, and the fourth partition electrode 2024 to enter the detection path. The synchronous demodulation branch 1053 receives the corresponding response signal and extracts the response component corresponding to the frequency of the low-energy detection signal, thereby obtaining the local interface impedance between the corresponding partition electrode 202 and the main treatment electrode 201. The local interface impedance can be determined based on the voltage and current responses of the detection signal, or it can be determined based on the known amplitude of the detection signal and the response amplitude obtained by synchronous demodulation.

[0029] Reference Figures 2 to 4 The treatment handpiece 2 has an end mounting base 204 at its front end. The end mounting base 204 is a fixed support structure for the front end of the treatment handpiece 2. The main treatment electrode 201 is located in the central area of ​​the end mounting base 204. Zone electrodes 202 are arranged around the main treatment electrode 201. The zone electrodes 202 include a first zone electrode 2021, a second zone electrode 2022, a third zone electrode 2023, and a fourth zone electrode 2024, arranged sequentially along the circumference of the main treatment electrode 201. An insulating isolation portion 203 is provided between the main treatment electrode 201 and each zone electrode 202, and an insulating isolation portion 203 is also provided between adjacent zone electrodes 202. The insulating isolation portions 203 keep the main treatment electrode 201 insulated from each zone electrode 202, and keep adjacent zone electrodes 202 insulated from each other. Each zone electrode 202 is fixedly mounted at the front end of the end mounting base 204.

[0030] The treatment handpiece 2 also includes a floating support 205. The main treatment electrode 201 is mounted on the front end of the floating support 205, which is located within an end mounting base 204. The end mounting base 204 has a guide groove 206, and the floating support 205 slides within the guide groove 206, allowing it to move back and forth along the axial direction of the treatment handpiece 2. An elastic reset element 207 is provided between the floating support 205 and the end mounting base 204; this element can be a compression spring, an elastic sleeve, or an elastic sheet. The floating support 205 has a limiting rod 208, which moves synchronously with the floating support 205. When the floating support 205 retracts to a preset position, the limiting rod 208 abuts against the inner wall of the end mounting base 204, thus limiting the retraction stroke of the floating support 205.

[0031] When the treatment handpiece 2 is not under pressure, the elastic reset member 207 pushes the floating support 205 forward, and the front end face of the main treatment electrode 201 protrudes beyond the front end face of the partition electrode 202. When the treatment handpiece 2 presses against the skin, the main treatment electrode 201 first contacts the skin, and then, under the reaction force of the skin, the main treatment electrode 201 drives the floating support 205 to move backward along the guide groove 206, and the elastic reset member 207 is compressed. After the floating support 205 retracts to the position where the limiting rod 208 abuts against the inner wall of the end mounting seat 204, the main treatment electrode 201 retracts to a position substantially coplanar with the partition electrode 202. This position serves as the mechanical position where the treatment handpiece 2 achieves effective pressing. In this mechanical position, the compensation control unit 107 allows the local detection unit 105 to establish the initial local interface impedance of each partition electrode 202.

[0032] Reference Figure 5 and Figure 6 The switching unit 106 includes a first switch group 1061, a second switch group 1062, and a protection discharge branch 1063. The first switch group 1061 is connected between the protective field driving unit 104 and the partition electrode 202, the second switch group 1062 is connected between the local detection unit 105 and the partition electrode 202, and the protection discharge branch 1063 is connected to the common connection node of the partition electrode 202. The protection discharge branch 1063 may employ a current-limiting resistor, a clamping diode, a transient voltage suppressor, or other limiting branch to release or limit residual charge before the partition electrode 202 switches from the protective field state to the detection state.

[0033] During the treatment pulse output, the first switch group 1061 is turned on, and the second switch group 1062 is turned off. The partition electrode 202 is connected to the protective field driving unit 104 through the first switch group 1061 and is in a protective field state. In this state, the local detection unit 105 is disconnected from the partition electrode 202 and does not participate in the treatment pulse output path. After the treatment pulse ends, the first switch group 1061 is turned off first, causing the partition electrode 202 to disconnect from the protective field driving unit 104; the protection discharge branch 1063 discharges or limits the residual charge of the partition electrode 202 within a preset protection interval; after the preset protection interval ends, the second switch group 1062 is turned on, and the partition electrode 202 is connected to the local detection unit 105 and is in a detection state. The first switch group 1061 and the second switch group 1062 are not turned on simultaneously to avoid direct connection between the protective field driving unit 104 and the local detection unit 105.

[0034] Reference Figure 7Within one treatment pulse cycle, the main circuit sampling unit 103 samples during the stable interval of the treatment pulse. After the treatment pulse ends, the partition electrode 202 first enters the discharge phase, and then enters the detection phase. During the detection phase, the multiplexing branch 1052 sequentially connects the first partition electrode 2021, the second partition electrode 2022, the third partition electrode 2023, and the fourth partition electrode 2024. The detection periods of each partition electrode 202 are staggered, and only the corresponding partition electrode 202 is connected to the local detection unit 105 during any given detection period. In this way, the local detection unit 105 can obtain the local interface impedance corresponding to each of the four partition electrodes.

[0035] Reference Figure 8 The neutral electrode 3 includes a first return current partition 301, a second return current partition 302, an insulating separator 303, a common connection terminal 304, a first detection terminal 305, and a second detection terminal 306. The first return current partition 301 and the second return current partition 302 are separated by the insulating separator 303. During the treatment pulse output, the first return current partition 301 and the second return current partition 302 together form the radio frequency return current terminal through the common connection terminal 304. During the treatment pulse interval, the first detection terminal 305 and the second detection terminal 306 are respectively connected to the local detection unit 105, and the local detection unit 105 respectively acquires the contact impedance corresponding to the first return current partition 301 and the second return current partition 302. The local detection unit 105 can complete the return current partition contact impedance detection before, after, or during an independent detection period within the same treatment pulse interval of the partition electrode 202.

[0036] The compensation control unit 107 establishes an initial local interface impedance after the treatment handpiece 2 achieves initial stable contact. Initial stable contact requires at least two conditions: first, the main treatment electrode 201 retracts to a preset retraction position along with the floating support 205; second, the fluctuation of the local interface impedance of each zone electrode 202 within a preset time does not exceed a stabilization threshold. The preset time can be set to several consecutive detection cycles. The stabilization threshold can be determined based on the device calibration value, treatment mode, or electrode area. If the treatment handpiece 2 fails to meet the above conditions within the preset time, the compensation control unit 107 determines that the treatment handpiece 2 has not achieved an effective compression state and prohibits radiofrequency output.

[0037] After the initial local interface impedance is established, the compensation control unit 107 acquires the current local interface impedance of each partition electrode 202 in subsequent detection cycles and compares the current local interface impedance with the corresponding initial local interface impedance. The compensation control unit 107 may use the maximum value of the change in each partition, the maximum difference between the changes in each partition, or the deviation of the change in each partition from the average change as the contact dispersion. When the contact dispersion does not exceed a preset dispersion threshold, the compensation control unit 107 determines that the treatment end contact is normal; when the contact dispersion exceeds the preset dispersion threshold, the compensation control unit 107 determines that the treatment end contact is abnormal.

[0038] The compensation control unit 107 also acquires the contact impedance of the first return zone 301 and the second return zone 302, and determines the contact status of the return end based on the difference in contact impedance between the two. When the difference in contact impedance between the two return zones does not exceed the return end threshold, the compensation control unit 107 determines that the return end contact is normal; when the difference in contact impedance between the two return zones exceeds the return end threshold, the compensation control unit 107 determines that the return end contact is abnormal. The return end threshold can be preset according to the area of ​​the neutral electrode 3, the attachment position, and the treatment mode.

[0039] The compensation control unit 107 determines the compensation requirements for subsequent treatment pulses based on the total equivalent impedance. When the total equivalent impedance is within the target impedance range, the output adjustment unit 102 maintains the current output parameters; when the total equivalent impedance deviates from the target impedance range and both the treatment end and the return end are in normal contact, the compensation control unit 107 controls the output adjustment unit 102 to adjust the output voltage, pulse width, number of sub-pulses, sub-pulse interval, or output duty cycle of the treatment pulse according to a preset step size. When multiple consecutive detection cycles determine that the contact is normal, the compensation control unit 107 allows the output adjustment unit 102 to perform positive compensation. When any detection cycle shows abnormal contact at the treatment end or at the return end, the compensation control unit 107 prohibits positive compensation. When both abnormal contact at the treatment end and at the return end exist simultaneously, the compensation control unit 107 determines it as an overall contact abnormality and stops the radio frequency output; when only abnormal contact at the treatment end or at the return end exists, the compensation control unit 107 determines it as a local contact abnormality and maintains or reduces the radio frequency output.

[0040] The field protection signal is adjusted according to the corresponding zone. The compensation control unit 107 compares the current local interface impedance of a zone electrode 202 with the initial local interface impedance of the same zone electrode 202 to obtain the impedance difference of that zone. When the impedance difference increases, the compensation control unit 107 outputs a zone field protection adjustment amount to the corresponding zone amplitude adjustment branch, so that the amplitude of the field protection signal applied to the zone electrode 202 during the next treatment pulse decreases or remains unchanged; when the impedance difference falls back to within the recovery threshold, the compensation control unit 107 allows the amplitude of the field protection signal of the corresponding zone electrode 202 to recover to the set value by a preset step size. The amplitude of the field protection signal of different zone electrodes 202 is adjusted separately.

[0041] Working principle and usage process In use, the neutral electrode 3 is attached to the predetermined reflux position on the body, and the front end of the treatment handpiece 2 is placed against the skin treatment position. The main treatment electrode 201 first contacts the skin, then drives the floating support 205 to retract along the guide groove 206, compressing the elastic reset member 207. When the floating support 205 retracts to the position where the limiting rod 208 abuts against the inner wall of the end mounting base 204, the main treatment electrode 201 and the partition electrode 202 are essentially coplanar. At this time, the local detection unit 105 performs low-energy detection on each partition electrode 202 through the switching unit 106. After the local interface impedance of each partition electrode 202 meets the stabilization condition within a preset time, the compensation control unit 107 records the corresponding initial local interface impedance.

[0042] During the output of the treatment pulse, the radio frequency output unit 101 generates a radio frequency signal, and the output adjustment unit 102 forms a treatment pulse according to the output parameters given by the compensation control unit 107, and loads the treatment pulse onto the main treatment electrode 201. The radio frequency current flows from the main treatment electrode 201 through the human body equivalent load A to the neutral electrode 3, and then returns to the radio frequency host 1. During the output of the treatment pulse, the first switch group 1061 is turned on, the second switch group 1062 is turned off, and the partition electrode 202 is connected to the protective field drive unit 104 and is in the protective field state.

[0043] During the output of the treatment pulse, the main circuit sampling unit 103 collects voltage and current sampling values ​​within the stable sampling range. The compensation control unit 107 determines the total equivalent impedance based on the sampling results and forms the compensation requirements for subsequent treatment pulses.

[0044] After the treatment pulse ends, the first switch group 1061 is disconnected, and the partition electrode 202 is disconnected from the protective field drive unit 104; the protection discharge branch 1063 discharges or limits the partition electrode 202 within a preset protection interval; the second switch group 1062 is then turned on, and the partition electrode 202 is connected to the local detection unit 105. The local detection unit 105 sequentially acquires the local interface impedance of the first partition electrode 2021, the second partition electrode 2022, the third partition electrode 2023, and the fourth partition electrode 2024, and acquires the contact impedance of the first return partition 301 and the second return partition 302 during the treatment pulse interval.

[0045] The compensation control unit 107 determines the contact status of the treatment end based on the difference in impedance between various local interfaces, and determines the contact status of the return end based on the difference in contact impedance between the first return zone 301 and the second return zone 302. When both the treatment end and the return end have normal contact, the compensation control unit 107 allows the output adjustment unit 102 to perform compensation based on the total equivalent impedance; when there is a contact abnormality at either the treatment end or the return end, the compensation control unit 107 prohibits forward compensation. When there is a contact abnormality at only one end, the output adjustment unit 102 maintains or reduces the radio frequency output; when there are contact abnormalities at both ends simultaneously, the output adjustment unit 102 stops the radio frequency output.

[0046] The above process is repeated cyclically between consecutive treatment pulses. The zone electrode 202 is connected to the field drive unit 104 during the treatment pulse output and to the local detection unit 105 during the interval between adjacent treatment pulses; the total equivalent impedance is used to determine the compensation requirement, and the treatment end contact state and the return end contact state are used to determine whether compensation is performed.

Claims

1. A real-time impedance-compensated low-interference skin anti-aging monopolar radiofrequency device, comprising a radiofrequency host (1), a treatment handpiece (2), and a neutral electrode (3), wherein the treatment handpiece (2) is provided with a main treatment electrode (201) for forming a monopolar radiofrequency circuit with the neutral electrode (3) through human tissue, characterized in that: The main treatment electrode (201) is surrounded by three or more mutually insulated partition electrodes (202), and the neutral electrode (3) is provided with two or more mutually insulated reflux partitions; The radio frequency host (1) is provided with a radio frequency output unit (101), an output adjustment unit (102), a main circuit sampling unit (103), a field protection drive unit (104), a local detection unit (105), a switching unit (106), and a compensation control unit (107). The switching unit (106) causes the partition electrode (202) to be connected to the protective field driving unit (104) during the treatment pulse output and to be in the protective field state. During the interval between adjacent treatment pulses, the partition electrode (202) is first disconnected from the protective field driving unit (104) and then each partition electrode (202) is connected to the local detection unit (105) and is in the detection state. The main circuit sampling unit (103) obtains the total equivalent impedance of the unipolar radio frequency circuit, and the local detection unit (105) obtains the local interface impedance of each partition electrode (202) and the contact impedance of each return partition in the detection state. The compensation control unit (107) determines the compensation requirement of the subsequent treatment pulse based on the total equivalent impedance, and judges the contact state based on the difference between the local interface impedances and the difference between the contact impedances. When the contact is normal, it controls the output adjustment unit (102) to perform compensation. When the contact is abnormal, it prohibits positive compensation and limits or stops the radio frequency output.

2. The real-time impedance-compensated low-interference skin anti-aging monopolar radio frequency device according to claim 1, characterized in that: The switching unit (106) includes a first switch group (1061) connected between the partition electrode (202) and the protective field driving unit (104), a second switch group (1062) connected between the partition electrode (202) and the local detection unit (105), and a protective discharge branch (1063) connected to the partition electrode (202). When switching from the treatment pulse output period to the interval of the adjacent treatment pulse, the first switch group (1061) is turned off first, and the protective discharge branch (1063) discharges or limits the residual charge of the partition electrode (202) within a preset protective interval, and the second switch group (1062) is then turned on.

3. The real-time impedance-compensated low-interference skin anti-aging monopolar radio frequency device according to claim 1, characterized in that: The protective field driving unit (104) is connected to each zone electrode (202) respectively, and applies a protective field signal to each zone electrode (202) during the treatment pulse output. The protective field signal is at the same frequency as the radio frequency signal of the main treatment electrode (201) and the phase difference is within a preset range. The amplitude of the protective field signal is not higher than the amplitude of the radio frequency signal of the main treatment electrode (201). The field protection drive unit (104) includes a field amplitude adjustment branch corresponding to each zone electrode (202). The compensation control unit (107) generates a corresponding field protection adjustment amount based on the difference between the current local interface impedance of the corresponding zone electrode (202) and its initial local interface impedance, so that the field protection signal amplitude applied to the zone electrode (202) during the next treatment pulse decreases or remains unchanged as the difference increases.

4. The real-time impedance-compensated low-interference skin anti-aging monopolar radio frequency device according to claim 1, characterized in that: The partitioned electrodes (202) include a first partitioned electrode (2021), a second partitioned electrode (2022), a third partitioned electrode (2023) and a fourth partitioned electrode (2024) respectively disposed on the four sides of the main treatment electrode (201). An insulating isolation part (203) is provided between the main treatment electrode (201) and each partitioned electrode (202) as well as between adjacent partitioned electrodes (202). Each partitioned electrode (202) is fixedly disposed on the end mounting base (204) at the front end of the treatment handpiece (2).

5. The real-time impedance-compensated low-interference skin anti-aging monopolar radio frequency device according to claim 1, characterized in that: The main circuit sampling unit (103) includes a voltage sampling branch (1031) and a current sampling branch (1032). The compensation control unit (107) determines a stable sampling interval after the rising edge of the treatment pulse and before the falling edge, and determines the total equivalent impedance based on the voltage sampling value and current sampling value corresponding to the stable sampling interval. The local detection unit (105) includes a low-energy detection signal source (1051), a multiplexing branch (1052), and a synchronous demodulation branch (1053). The multiplexing branch (1052) is used to sequentially apply the low-energy detection signal between a partition electrode (202) and the main treatment electrode (201). The synchronous demodulation branch (1053) is used to extract the response signal corresponding to the frequency of the low-energy detection signal.

6. The real-time impedance-compensated low-interference skin anti-aging monopolar radio frequency device according to claim 1, characterized in that: After the treatment handpiece (2) is initially stably attached, the compensation control unit (107) records the initial local interface impedance corresponding to each of the partition electrodes (202), and forms a contact dispersion based on the change in the current local interface impedance of each partition electrode (202) relative to the corresponding initial local interface impedance; when the contact dispersion does not exceed the preset dispersion threshold, the treatment end is determined to be in normal contact, and when the contact dispersion exceeds the preset dispersion threshold, the treatment end is determined to be in abnormal contact.

7. The real-time impedance-compensated low-interference skin anti-aging monopolar radio frequency device according to claim 6, characterized in that: The output adjustment unit (102) is used to adjust any or more parameters among the output voltage, pulse width, number of sub-pulses, sub-pulse interval and output duty cycle of the treatment pulse; the compensation control unit (107) allows the radio frequency output to be increased only when the contact is determined to be normal in multiple consecutive detection cycles, and limits the parameter adjustment amount in a single compensation cycle, and maintains, reduces or stops the radio frequency output when the contact dispersion is close to or exceeds the preset dispersion threshold.

8. The real-time impedance-compensated low-interference skin anti-aging monopolar radio frequency device according to claim 1, characterized in that: The treatment handpiece (2) has an end mounting base (204) and a floating support base (205) at its front end. The main treatment electrode (201) is mounted on the floating support base (205), and the partition electrode (202) is mounted on the end mounting base (204). The end mounting base (204) has a guide groove (206) for axial sliding of the floating support base (205). An elastic reset member (207) is provided between the floating support base (205) and the end mounting base (204). The floating support base (205) has a limiting rod (208). The limiting rod (208) is used to abut against the inner wall of the end mounting seat (204) when the floating support seat (205) retracts to the preset position, so as to limit the retraction of the floating support seat 205; the main treatment electrode (201) protrudes from the partition electrode (202) in the unpressurized state, and retracts with the floating support seat (205) to be basically coplanar with the partition electrode (202) after being pressed; after the main treatment electrode (201) reaches the preset retraction position, the local detection unit (105) establishes the initial local interface impedance of each partition electrode (202).

9. The real-time impedance-compensated low-interference skin anti-aging monopolar radio frequency device according to claim 8, characterized in that: If the treatment handpiece (2) fails to establish a stable initial local interface impedance of each zone electrode (202) within a preset time, the compensation control unit (107) determines that the treatment handpiece (2) has not formed an effective pressing state and prohibits radio frequency output.

10. The real-time impedance-compensated low-interference skin anti-aging monopolar radio frequency device according to claim 1, characterized in that: The recirculation partition includes a first recirculation partition (301) and a second recirculation partition (302). The first recirculation partition (301) and the second recirculation partition (302) together form a radio frequency recirculation end during the treatment pulse output, and are respectively connected to a local detection unit (105) during the interval between adjacent treatment pulses. The compensation control unit (107) determines that the overall contact is abnormal and stops the radio frequency output when both the treatment end contact abnormality and the recirculation end contact abnormality exist at the same time. When only the treatment end contact abnormality or the recirculation end contact abnormality exists, it determines that the local contact is abnormal and maintains or reduces the radio frequency output.

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