Skin treatment mechanism

Abstract

The invention discloses a skin treatment mechanism, and relates to the technical field of medical equipment.The skin treatment mechanism comprises a main control unit, an air pressure adjusting unit and an electrode unit, the air pressure adjusting unit and the electrode unit are electrically connected with the main control unit, and the electrode unit is attached to the skin to form a negative pressure cavity; the negative pressure cavity is communicated with the air pressure adjusting unit and the electrode unit; the main control unit is used for controlling the air pressure adjusting unit to roughly adjust the pressure of the negative pressure cavity to a first air pressure value; comparing the first air pressure value with a target negative pressure value to determine a first air pressure difference value; according to the first air pressure difference value, the air pressure adjusting unit is controlled to finely adjust the negative pressure cavity from the first air pressure value to the target negative pressure value so as to control the electrode unit to work. The negative pressure output by the skin treatment mechanism is adjusted with different precisions through the air pressure adjusting unit, so that the negative pressure adjusting precision of the skin treatment mechanism is improved, the pressure stability of the skin treatment mechanism is improved, and the service life of the skin treatment mechanism is prolonged.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a skin treatment mechanism. Background Technology

[0002] A skin treatment device is a minimally invasive device that attaches a radiofrequency electrode or electrode to the skin and injects a high-frequency current to produce a thermal effect on biological tissue. In order to better control the degree of adhesion between the radiofrequency electrode or electrode and the skin, negative pressure is required to adsorb the skin from different parts of the body onto the end face of the radiofrequency electrode or electrode.

[0003] Because the negative pressure regulation method of existing skin treatment institutions is to regulate negative pressure by opening and closing ordinary solenoid valves, the negative pressure regulation accuracy is not high, the pressure is unstable, and it is easy to leak air. In addition, the frequent opening and closing of solenoid valves affects their lifespan. Summary of the Invention

[0004] The main objective of this invention is to provide a skin treatment mechanism that uses a pneumatic pressure regulating unit to adjust the negative pressure with varying degrees of precision, thereby improving the accuracy of negative pressure regulation, enhancing the stability of pressure within the skin treatment mechanism, and ultimately extending its lifespan.

[0005] To achieve the above objectives, the present invention proposes a skin treatment mechanism, which includes a main control unit, an air pressure regulating unit, and an electrode unit. The air pressure regulating unit and the electrode unit are electrically connected to the main control unit, and the electrode unit is in contact with the skin to form a negative pressure cavity, and the negative pressure cavity is connected to the air pressure regulating unit and the electrode unit. The main control unit is used for: The pressure regulating unit is controlled to coarsely adjust the pressure value of the negative pressure chamber to the first pressure value; The first air pressure value is compared with the target negative pressure value to determine the first air pressure difference; When the first air pressure difference is less than a preset threshold, the air pressure regulating unit is controlled to fine-tune the negative pressure chamber from the first air pressure value to the target negative pressure value, so as to control the electrode unit to work.

[0006] In one embodiment, the skin treatment mechanism further includes a first pressure sensor connected between the air pressure regulating unit and the electrode unit. The first pressure sensor is electrically connected to the main control unit and is used to detect the air pressure value of the negative pressure chamber in real time, the first air pressure value after coarse adjustment, and the target negative pressure value after fine adjustment.

[0007] In one embodiment, the pressure regulating unit includes a solenoid valve, a proportional valve, and a vacuum pump. The solenoid valve is connected to the negative pressure chamber, and the negative pressure chamber and the external environment are respectively connected to the solenoid valve. The solenoid valve, the proportional valve, and the vacuum pump are interconnected. The vacuum pump, the proportional valve, and the solenoid valve are respectively electrically connected to the main control unit. The first pressure sensor is connected between the solenoid valve and the electrode unit. The main control unit is also used to control the vacuum pump to start and run at a first speed; when the first pressure difference is less than the preset threshold, it controls the vacuum pump to run at a second speed and controls the opening of the proportional valve to make fine adjustments.

[0008] In one embodiment, the pressure regulating unit includes a solenoid valve, a proportional valve, and a vacuum pump. The solenoid valve is connected to the negative pressure chamber, and the negative pressure chamber and the external environment are respectively connected to the solenoid valve. The solenoid valve is connected to the vacuum pump. One end of the proportional valve is connected between the solenoid valve and the vacuum pump, and the other end of the proportional valve is used to connect to the external environment. The vacuum pump, the proportional valve, and the solenoid valve are respectively electrically connected to the main control unit. The first pressure sensor is connected between the solenoid valve and the electrode unit. The main control unit is also used to control the vacuum pump to start and run at a first speed; when the first pressure difference is less than the preset threshold, it controls the vacuum pump to run at a second speed and controls the opening of the proportional valve to make fine adjustments.

[0009] In one embodiment, the main control unit is specifically used for: In response to fine-tuning the opening of the proportional valve, the opening of the proportional valve is adjusted according to a preset control mode; The control mode is any one of the following: Continuous control mode: The opening degree of the proportional valve is continuously varied within the range of greater than 0% to less than 100%. Fourth-order and above control modes: The opening degree of the proportional valve is controlled to be sequentially adjusted to the first preset opening value, the second preset opening value, the third preset opening value, the fourth preset opening value and / or the Nth preset opening value, where N is greater than four.

[0010] In one embodiment, in response to fine-tuning the opening of the proportional valve, the driving current of the proportional valve is adjusted continuously or discretely by a number of preset current values.

[0011] In one embodiment, the skin treatment mechanism further includes a second pressure sensor connected between the solenoid valve and the proportional valve, for detecting the regulating pressure of the proportional valve; the second pressure sensor is electrically connected to the main control unit; The main control unit is also used to acquire the second air pressure value detected by the second pressure sensor between the solenoid valve and the proportional valve; The main control unit is also used to: determine whether there is a blockage or leakage between the solenoid valve and the proportional valve when the first air pressure value and the second air pressure value are not equal, and issue a prompt or alarm.

[0012] In one embodiment, the vacuum pump includes a pump body and a brushless DC motor connected to the pump body. The pump body is connected to the proportional valve. The brushless DC motor is provided with a half-bridge drive circuit, and the half-bridge drive circuit is electrically connected to the main control unit. The main control unit is also used to send PWM signals to the half-bridge drive circuit to control the speed of the brushless DC motor and the pumping volume of the vacuum pump.

[0013] In one embodiment, the skin treatment mechanism further includes a handle, a main unit, a first filter, and a second filter. The handle is provided with a negative pressure pipeline, and the negative pressure chamber is connected to the negative pressure pipeline. The first filter is disposed in the negative pressure chamber or in the negative pressure pipeline adjacent to the negative pressure chamber. The main unit further includes a housing, in which the main control unit, the solenoid valve, the proportional valve, and the vacuum pump are all installed. The housing is provided with an interface connected to the solenoid valve. The second filter is installed at the interface.

[0014] In one embodiment, the main control unit is also used to set the target negative pressure value required by the user based on different degrees of skin laxity.

[0015] The skin treatment mechanism of this invention includes a main control unit, a pressure regulating unit, and an electrode unit. The pressure regulating unit and the electrode unit are electrically connected to the main control unit. The electrode unit is in contact with the skin to form a negative pressure chamber, and the negative pressure chamber is connected to the pressure regulating unit and the electrode unit. The main control unit controls the pressure regulating unit to initially adjust the first pressure value of the negative pressure chamber with a coarse precision based on the skin. Then, by obtaining the first pressure difference value obtained by comparing the target negative pressure value with the first pressure value, the timing for controlling the pressure regulating unit to perform fine adjustment is determined. This achieves a step-by-step adjustment method, first coarsely adjusting and then finely adjusting the negative pressure, which significantly improves the accuracy of negative pressure regulation and the stability of the pressure in the negative pressure chamber. At the same time, it avoids the lifespan problem caused by the frequent on / off switching of traditional solenoid valves, thereby extending the overall service life of the skin treatment mechanism. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a schematic diagram of a structure of an embodiment of the skin treatment mechanism provided by the present invention; Figure 2 This is a schematic diagram of another embodiment of the skin treatment mechanism provided by the present invention.

[0018] Explanation of icon numbers: 10. Handle; 20. Main unit; 21. Main control unit; 22. Air pressure regulating unit; 221. Solenoid valve; 222. Proportional valve; 223. Vacuum pump; 30. First pressure sensor; 40. Second pressure sensor; 50. First filter; 60. Second filter; 70. First silencer; 80. Second silencer.

[0019] 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

[0020] 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.

[0021] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators 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 indicators will also change accordingly.

[0022] 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. Therefore, 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 that simultaneously satisfies A and B. 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 protection scope of the embodiments of this case.

[0023] In skin treatment facilities with energy sources, the low precision of negative pressure chamber pressure regulation during cosmetic skin procedures weakens air pressure stability, leading to gas leakage and shortening the mechanical lifespan of solenoid valves due to frequent on / off operations. This problem results in pressure control during skin adsorption failing to precisely match the needs of different tissue areas. For example, when the energy source is a radiofrequency energy device, the negative pressure adsorption force around the eyes should be greater than that of facial skin. Maintaining a constant negative pressure makes it difficult to fix the skin in different tissue areas, reducing the effectiveness of radiofrequency energy. For instance, when treating the cheekbone area, the skin tissue is thin and sensitive, requiring a negative pressure value maintained within a small range sufficient to stabilize the skin at the target location. However, in existing adjustment methods, the transient switching action of the solenoid valve triggers significant fluctuations in negative pressure chamber pressure near the target value, resulting in insufficient local skin adsorption or excessive traction. This affects the stable output of radiofrequency energy to the subcutaneous tissue, impacting the accuracy of the layered thermal coagulation effect of high-frequency current delivery to the subcutaneous layer.

[0024] Understandably, the energy source for skin treatment facilities can also be lasers, non-invasive radiofrequency devices, microneedle radiofrequency devices, focused ultrasound devices, and beauty serum delivery devices such as mesotherapy.

[0025] For this, please refer to Figure 1This application proposes a skin treatment mechanism, which includes a main control unit 21, a pressure regulating unit 22, and an electrode unit. The pressure regulating unit 22 and the electrode unit are electrically connected to the main control unit. The electrode unit is in contact with the skin to form a negative pressure chamber, and the negative pressure chamber is connected to the pressure regulating unit 22 and the electrode unit. The main control unit 21 is used to control the pressure regulating unit 22 to coarsely adjust the pressure of the negative pressure chamber to a first pressure value; compare the first pressure value with a target negative pressure value to determine a first pressure difference; and, based on the first pressure difference, control the pressure regulating unit 22 to finely adjust the negative pressure chamber from the first pressure value to the target negative pressure value, thereby controlling the operation of the electrode unit.

[0026] A skin treatment unit is a device used to treat the skin. It generates and regulates negative pressure to attract the skin, providing a stable foundation for subsequent radiofrequency electrodes or other electrode treatments. The main control unit 21 is the core control component of this skin treatment unit. It typically consists of a microprocessor, memory, and input / output interfaces, responsible for receiving instructions, processing data, and sending control signals to other functional units to coordinate the operation of the entire unit. The air pressure regulating unit 22 is used to generate, maintain, and regulate the pressure within the negative pressure chamber. It achieves precise control of the negative pressure chamber pressure by drawing in or releasing gas. The electrode unit is the component that directly contacts the skin and performs the treatment. Typically, after the skin is attracted, the electrode unit can output corresponding energy for treatment. The negative pressure chamber refers to the sealed space formed after the electrode unit adheres to the skin. The pressure within this space is lower than the external atmospheric pressure, thus generating an adsorption force that stably attaches the skin to the surface of the electrode unit.

[0027] The first pressure value refers to the initial pressure level achieved during the coarse adjustment phase of the negative pressure chamber. This pressure value is usually close to, but has not yet reached, the final target negative pressure value. The target negative pressure value refers to the precise pressure level that the skin treatment institution expects to achieve within the negative pressure chamber before performing radiofrequency electrode or electrode treatment. This value is preset according to treatment needs. The first pressure difference refers to the pressure difference between the first pressure value and the target negative pressure value. This difference is used to indicate the deviation between the pressure after coarse adjustment and the target pressure, and serves as the basis for subsequent fine adjustment. Coarse adjustment refers to the initial, large-amplitude adjustment of the negative pressure chamber pressure to quickly approach the target negative pressure value, but some deviation may exist. Fine adjustment refers to the small-amplitude, high-precision adjustment of the negative pressure chamber pressure based on the coarse adjustment to eliminate the deviation after coarse adjustment, so that the negative pressure chamber pressure accurately reaches the target negative pressure value.

[0028] The skin treatment device comprises a main control unit 21, a pressure regulating unit 22, and an electrode unit. The main control unit 21 controls the pressure regulating unit 22 to control the negative pressure value. The pressure regulating unit 22, controlled by the main control unit 21, generates, maintains, and regulates the pressure within the negative pressure chamber, achieving precise control of the negative pressure chamber pressure. The electrode unit is electrically connected to a high-frequency source and applies high-frequency current to the dermis and deeper tissues of the skin to create a thermal coagulation zone. For example, the main control unit 21 could be an embedded controller, the pressure regulating unit 22 could be a simple vacuum pump, and the electrode unit could be a treatment head with invasive or non-invasive radiofrequency electrodes.

[0029] Both the pressure regulating unit 22 and the electrode unit are electrically connected to the main control unit 21. This connection allows the main control unit 21 to send control commands to the pressure regulating unit 22, such as starting or stopping the vacuum pump, and to send operating commands to the high-frequency current source, such as controlling the output of radio frequency energy. The electrical connection can be implemented via a wired connection, such as through a wire, or wirelessly, such as through Bluetooth or Wi-Fi modules.

[0030] When the end face of the electrode unit comes into contact with the skin, it can form a relatively sealed space, i.e., a negative pressure chamber, with the skin surface. The formation of this negative pressure chamber is key to achieving skin adsorption. For example, the end face of the electrode unit has a negative pressure groove. When the end face is in contact with the skin surface, this negative pressure groove can effectively prevent external air from entering, thereby forming a closed negative pressure chamber between the skin surface and the negative pressure groove. This formed negative pressure chamber is connected to the air pressure regulating unit 22 and the electrode unit. This connection ensures that the air pressure regulating unit 22 can draw in or release the gas in the negative pressure chamber, thereby changing the pressure inside the chamber. At the same time, the electrode unit also senses the pressure changes inside the negative pressure chamber through this connection path.

[0031] The main control unit 21 plays a core role in the entire negative pressure regulation process.

[0032] First, the main control unit 21 controls the pressure regulating unit 22 to coarsely adjust the pressure in the negative pressure chamber, so that it quickly reaches a preset first pressure value. For example, the main control unit 21 can instruct the vacuum pump in the pressure regulating unit 22 to run at a fixed power for a period of time until the pressure in the negative pressure chamber drops to a certain rough level.

[0033] Subsequently, the main control unit 21 compares the currently detected first air pressure value with the preset target negative pressure value to calculate the first air pressure difference between the two. This comparison process can be implemented through a software algorithm within the main control unit 21. For example, the main control unit 21 can obtain the target negative pressure value from a preset lookup table and subtract it from the real-time acquired first air pressure value to obtain the first air pressure difference.

[0034] Finally, based on the calculated first pressure difference, the main control unit 21 further controls the pressure regulating unit 22 to fine-tune the pressure in the negative pressure chamber, ensuring it precisely reaches the target negative pressure value from the first pressure value. Once the negative pressure chamber pressure reaches the target negative pressure value, the main control unit 21 controls the electrode unit to begin operation. The main control unit 21 can compare the first pressure difference with a preset threshold value and, based on the comparison result, instruct a valve in the pressure regulating unit 22 to open or close slightly, or instruct the vacuum pump to operate at a lower speed to slowly and precisely adjust the pressure. For example, when the first pressure difference is less than the preset threshold, the pressure regulating unit 22 can be controlled to fine-tune the negative pressure chamber from the first pressure value to the target negative pressure value, thus controlling the electrode unit to operate.

[0035] The following example will provide a more detailed explanation of the above technical solution: Suppose user A needs to undergo radiofrequency electrode treatment or electrode treatment on their skin, and sets a target negative pressure value, such as -50 kPa, on the skin treatment device based on their skin type and treatment needs. First, user A places the electrode unit on the skin area to be treated, ensuring close contact with the skin, thus creating a negative pressure chamber between the electrode unit and the skin. Next, after receiving the start command, the main control unit 21 begins the negative pressure adjustment process. The main control unit 21 first controls the air pressure regulating unit 22 to start, for example, instructing the vacuum pump in the air pressure regulating unit 22 to operate at high power to evacuate the negative pressure chamber. This is a coarse adjustment process, aimed at rapidly reducing the pressure within the negative pressure chamber. When the pressure within the negative pressure chamber drops to, for example, -40 kPa, this value is determined as the first air pressure value. At this point, the main control unit 21 stops or reduces the coarse adjustment action of the air pressure regulating unit 22. Subsequently, the main control unit 21 compares the current first air pressure value of -40 kPa with the preset target negative pressure value of -50 kPa, calculating a first pressure difference of -10 kPa. This difference indicates the deviation between the current pressure and the target pressure.

[0036] Based on this initial pressure difference, the main control unit 21 enters the fine-tuning stage. The main control unit 21 precisely controls the pressure regulating unit 22 according to the -10 kPa difference. For example, the main control unit 21 can instruct a precision valve in the pressure regulating unit 22 to open or close slightly, or instruct the vacuum pump to continue pumping air at a lower speed, so as to slowly and accurately adjust the pressure in the negative pressure chamber from -40 kPa to -50 kPa. During the fine-tuning process, the main control unit 21 continuously monitors the pressure in the negative pressure chamber until it precisely reaches the target negative pressure value.

[0037] Once the pressure in the negative pressure chamber stabilizes at the target negative pressure value of -50 kPa, the main control unit 21 will issue a command to control the electrode unit to start working, such as initiating radiofrequency electrode therapy or electrode energy output. Through this combination of coarse and fine adjustment, the pressure in the negative pressure chamber can be quickly and accurately adjusted to the required target value, providing a stable adsorption basis for radiofrequency electrode therapy or electrode therapy.

[0038] Based on the above examples, the technical concept of this skin treatment device demonstrates significant advancement. In existing technologies, negative pressure regulation typically relies on the simple on / off control of ordinary solenoid valves, which has limitations in terms of adjustment accuracy and pressure stability. For example, when it is necessary to adjust the negative pressure chamber pressure from atmospheric pressure to a target negative pressure value, the on / off control of ordinary solenoid valves cannot achieve a smooth and precise pressure transition, easily leading to pressure overshoot or undershoot, thereby affecting the stability of skin adsorption and the accuracy of radiofrequency electrode treatment or electrode therapy. Furthermore, frequent on / off operations of the solenoid valve may also shorten its lifespan.

[0039] In contrast, the skin treatment mechanism proposed in this embodiment, through the main control unit 21 controlling the air pressure regulating unit 22, decomposes the negative pressure regulation process into two stages: coarse adjustment and fine adjustment. In the example above, the negative pressure chamber pressure is first rapidly reduced to a first air pressure value, for example, from atmospheric pressure to -40 kPa, through coarse adjustment. This stage can quickly reach a level close to the target negative pressure value, avoiding the long-term coarse suction in traditional methods. Subsequently, based on the first air pressure difference between the first air pressure value and the target negative pressure value, when the first air pressure difference is less than a preset threshold, for example -10 kPa, the main control unit 21 performs fine control on the air pressure regulating unit 22, precisely adjusting the pressure from the first air pressure value greater than -40 kPa to the target negative pressure value of -50 kPa.

[0040] This phased adjustment strategy enables the pressure in the negative pressure chamber to reach the preset target value with higher accuracy and stability. The coarse adjustment stage ensures the adjustment speed, while the fine adjustment stage ensures the accuracy of the final pressure, effectively solving the problems of low negative pressure adjustment accuracy and pressure instability in existing technologies. Simultaneously, because the fine adjustment stage can employ more precise control methods, such as small-amplitude adjustments to valve openings or lower-speed operation of the vacuum pump, it avoids the drawbacks of frequent large-amplitude switching of traditional solenoid valves, thus helping to extend the service life of key components in the pressure regulation unit. Therefore, this technical solution makes a positive contribution to improving negative pressure adjustment accuracy, enhancing pressure stability, and extending equipment life.

[0041] Please see Figure 1This application further proposes that the skin treatment mechanism also includes a first pressure sensor 30 connected between the air pressure regulating unit 22 and the electrode unit. The first pressure sensor 30 is electrically connected to the main control unit 21 and is used to detect the first air pressure value of the negative pressure chamber. The main control unit 21 is also used to acquire the air pressure value of the negative pressure chamber detected by the first pressure sensor 30, the coarsely adjusted first air pressure value, and the finely adjusted target negative pressure value.

[0042] The first pressure sensor 30 is a device used to monitor the gas pressure inside the negative pressure chamber in real time. Its function is to provide accurate pressure feedback signals, enabling the main control unit 21 to accurately understand the current pressure state of the negative pressure chamber, specifically detecting the gas pressure value of the negative pressure chamber, the coarsely adjusted first gas pressure value, and the finely adjusted target negative pressure value. The first pressure sensor 30 can be implemented using various technologies. For example, it can be a piezoresistive pressure sensor, which utilizes the piezoresistive effect of semiconductor materials to convert pressure changes into resistance changes, which are then converted into electrical signals through a circuit; alternatively, it can be a capacitive pressure sensor, which utilizes the change in distance or area between capacitor plates caused by pressure, resulting in a change in capacitance, thereby outputting an electrical signal; or it can be a piezoelectric pressure sensor, which utilizes the effect of piezoelectric materials generating charge when subjected to pressure to convert pressure into an electrical signal. The first pressure sensor 30 is connected between the pressure regulating unit 22 and the electrode unit to ensure that it can directly sense the pressure inside the negative pressure chamber.

[0043] The main control unit 21 acquires the first air pressure value of the negative pressure chamber detected by the first pressure sensor 30. Its function is to enable the main control unit 21 to obtain the actual pressure data of the negative pressure chamber in real time, which serves as the basis for subsequent pressure adjustment. The main control unit 21 can acquire the air pressure value by analog signal acquisition, that is, the first pressure sensor 30 outputs an analog voltage or current signal, and the main control unit 21 converts it into a digital signal through its built-in analog-to-digital converter (ADC); or, the main control unit 21 can acquire the air pressure value by digital signal communication, that is, the first pressure sensor 30 has a built-in ADC and directly outputs digital signals such as I2C, SPI or UART, and the main control unit 21 reads the data through the corresponding communication interface.

[0044] The main control unit 21 controls the pressure regulating unit 22 to finely adjust the first pressure value of the negative pressure chamber to the target negative pressure value based on the first pressure difference. Its function is to utilize real-time pressure feedback to achieve precise closed-loop control of the negative pressure chamber pressure, ensuring that the negative pressure chamber pressure can stably and accurately reach the target negative pressure value. The main control unit 21 can employ a PID control algorithm, calculating the control quantity based on the first pressure difference (error) and combining proportional, integral, and derivative terms to drive the pressure regulating unit 22 for fine adjustment; alternatively, the main control unit 21 can employ a fuzzy control algorithm, using fuzzy rules to infer and output the control quantity based on the first pressure difference and its rate of change.

[0045] To ensure accurate subsequent fine-tuning, this solution incorporates a first pressure sensor 30. This first pressure sensor 30 is cleverly connected between the pressure regulating unit 22 and the electrode unit, enabling it to directly and in real-time detect the actual pressure within the negative pressure chamber and feed this first pressure value back to the main control unit 21. Upon receiving this precise pressure feedback, the main control unit 21 compares it with a preset target negative pressure value, thereby calculating the first pressure difference between the current first pressure value and the target negative pressure value. Based on this real-time, precise first pressure difference, the main control unit 21 can issue commands to finely control the pressure regulating unit 22, gradually adjusting the pressure in the negative pressure chamber to smoothly and accurately reach the target negative pressure value from the coarsely adjusted first pressure value. In this way, the first pressure sensor 30 provides a crucial closed-loop feedback mechanism, allowing the main control unit 21 to control the pressure in the negative pressure chamber with high precision and stability, thereby ensuring the electrode unit operates in an ideal negative pressure environment and improving the accuracy and safety of the treatment.

[0046] In one specific implementation, the skin treatment mechanism can be configured with a MEMS pressure sensor as a first pressure sensor 30. This first pressure sensor 30 is connected to the negative pressure chamber via a flexible tube, and its output digital signal (e.g., I2C protocol) is connected to the corresponding communication interface of the main control unit 21. The main control unit 21 can be a high-performance microcontroller with an integrated I2C communication module. After coarse adjustment, the main control unit 21 periodically (e.g., every 5 milliseconds) reads the pressure data from the first pressure sensor 30 via the I2C interface. Then, the main control unit 21 compares this first pressure value with the target negative pressure value to calculate the first pressure difference. If the first pressure difference exceeds a preset threshold, the main control unit 21 calculates the required adjustment amount for the pressure regulating unit 22 (e.g., the speed of the vacuum pump or the opening of the proportional valve) according to a preset PID control algorithm, and controls the pressure regulating unit 22 to perform fine adjustment via a PWM signal or digital output until the pressure in the negative pressure chamber stabilizes at the target negative pressure value.

[0047] Please see Figure 1 This application further proposes that the pressure regulating unit 22 includes a solenoid valve 221, a proportional valve 222, and a vacuum pump 223. The solenoid valve 221 is connected to the negative pressure chamber, and the negative pressure chamber and the external environment are respectively connected to the solenoid valve 221. The solenoid valve 221, the proportional valve 222, and the vacuum pump 223 are interconnected. The vacuum pump 223, the proportional valve 222, and the solenoid valve 221 are respectively electrically connected to the main control unit 21. The first pressure sensor 30 is connected between the solenoid valve 221 and the electrode unit. The main control unit 21 is also used to control the vacuum pump 223 to start and operate at a first speed; and then, when the first pressure difference is less than a preset threshold, to control the vacuum pump 223 to operate at a second speed, and to finely adjust the opening of the proportional valve 222. In this embodiment, the proportional valve 222 is connected in series in the pipeline.

[0048] The pressure regulating unit 22 is the core component for generating, regulating, and maintaining negative pressure. Its solenoid valve 221, proportional valve 222, and vacuum pump 223 are key actuators for achieving precise negative pressure control. The vacuum pump 223 generates negative pressure, the solenoid valve 221 quickly connects or disconnects the negative pressure chamber, connects or disconnects the negative pressure pipeline from the external environment, and can depressurize the negative pressure pipeline. The proportional valve 222 is used for fine-tuning the negative pressure. This combination provides multi-level pressure control capabilities. The solenoid valve 221 is a device that controls the opening and closing of the valve via an electrical signal; its function is to act as a quick switch between the negative pressure chamber and the vacuum pump 223 or the external environment. By controlling the opening and closing of the solenoid valve 221 through the main control unit 21, rapid evacuation or depressurization of the negative pressure chamber can be achieved, thereby enabling coarse adjustment or emergency release of negative pressure. For example, solenoid valve 221 can be a two-position three-way valve, with one port connected to the negative pressure chamber, one port connected to vacuum pump 223, and the other port connected to the external environment. Switching the valve state enables evacuation or depressurization. Alternatively, it can be two independent two-position two-way valves, one connected to vacuum pump 223 and the other connected to the external environment. Solenoid valve 221, proportional valve 222, and vacuum pump 223 are interconnected, ensuring that all components within the pressure regulating unit 22 can work collaboratively. The negative pressure generated by vacuum pump 223 is transmitted to solenoid valve 221 through a pipeline, and solenoid valve 221 then determines whether to introduce negative pressure into the negative pressure chamber or connect the negative pressure chamber to the external environment based on control commands. Proportional valve 222 can be installed on the pipeline between vacuum pump 223 and solenoid valve 221, or on the depressurization pipeline between the negative pressure chamber and the external environment, for fine-tuning airflow. Vacuum pump 223, proportional valve 222 and solenoid valve 221 are electrically connected to main control unit 21. The electrical connection between each actuator and main control unit 21 is the basis for realizing automated control.

[0049] The main control unit 21 controls the start / stop and speed of the vacuum pump 223, the on / off state of the solenoid valve 221, and the opening degree of the proportional valve 222 by sending electrical signals, thereby achieving precise control of the pressure in the negative pressure chamber. The first pressure sensor 30 is connected between the solenoid valve 221 and the electrode unit; its placement ensures that it can accurately detect the actual gas pressure value in the negative pressure chamber in real time. Placing it between the solenoid valve 221 and the electrode unit avoids interference from transient pressure fluctuations that may occur when the solenoid valve 221 operates, thus obtaining pressure data closer to the actual working environment of the electrode unit and providing reliable feedback for subsequent pressure adjustment. The main control unit 21 is also used to control the vacuum pump 223 to start and operate at a first speed, which is the coarse adjustment stage in the negative pressure establishment process. After receiving the start command, the main control unit 21 controls the vacuum pump 223 to operate at a relatively high speed (the first speed) to quickly reduce the pressure in the negative pressure chamber to a level close to the target negative pressure value. The first speed is usually a preset speed that can provide a large pumping volume to shorten the negative pressure establishment time. Until the first pressure difference is less than a preset threshold, the vacuum pump 223 is controlled to operate at a second speed, and the opening of the proportional valve 222 is finely adjusted. This is the fine-tuning stage of negative pressure regulation. When the difference between the negative pressure chamber pressure detected by the first pressure sensor 30 and the target negative pressure value (the first pressure difference) decreases below the preset threshold, it indicates that the negative pressure chamber pressure is close to the target value. At this time, the main control unit 21 will reduce the speed of the vacuum pump 223 to a second speed (usually lower than the first speed to reduce the pumping volume and facilitate fine-tuning), and begin to finely adjust the negative pressure by controlling the opening of the proportional valve 222. The proportional valve 222 can precisely control the flow rate of air entering or exiting the negative pressure chamber, thereby stabilizing the pressure of the negative pressure chamber at the target negative pressure value.

[0050] In the aforementioned skin treatment mechanism, the main control unit 21 controls the air pressure regulating unit 22 and the electrode unit via electrical connection. After the electrode unit adheres to the skin to form a negative pressure chamber, the main control unit 21 first activates the vacuum pump 223 in the air pressure regulating unit 22, causing it to operate at a first rotational speed. At this time, the solenoid valve 221 is controlled by the main control unit 21 to connect the negative pressure chamber to the vacuum pump 223. The vacuum pump 223 rapidly draws air from the negative pressure chamber, causing the pressure in the negative pressure chamber to drop rapidly. The first pressure sensor 30 detects the pressure in the negative pressure chamber in real time and feeds back the detected first air pressure value to the main control unit 21. The main control unit 21 compares this first air pressure value with a preset target negative pressure value to calculate the first air pressure difference. When the first air pressure difference is large, the vacuum pump 223 continues to operate at the first rotational speed, continuing to perform coarse adjustment of the negative pressure. As the pressure in the negative pressure chamber continuously decreases, the first air pressure difference gradually decreases. Once the first air pressure difference is less than a preset threshold, the main control unit 21 activates the fine adjustment mode. In fine-tuning mode, the main control unit 21 adjusts the operating state of the vacuum pump 223 to run at a second speed, typically lower than the first speed, to reduce the pumping rate and provide a more stable foundation for fine-tuning. Simultaneously, the main control unit 21 begins precisely controlling the opening of the proportional valve 222 in the pressure regulating unit 22. By adjusting its opening, the proportional valve 222 precisely controls the flow rate of air entering or exiting the negative pressure chamber, thereby fine-tuning the pressure in the negative pressure chamber. This fine-tuning accuracy is higher than in the coarse-tuning mode. The first pressure sensor 30 continuously provides pressure feedback, and the main control unit 21 dynamically adjusts the opening of the proportional valve 222 based on the feedback signal until the pressure in the negative pressure chamber is precisely stabilized at the target negative pressure value. This control strategy, combining coarse and fine-tuning, allows the negative pressure chamber to quickly establish negative pressure and subsequently maintain it at the target negative pressure value with high precision, ensuring that the electrode unit operates in an optimal negative pressure environment, improving treatment efficacy and safety.

[0051] The following is a specific example: The main control unit 21 can be a high-performance microcontroller, such as the STM32F407 microcontroller based on the ARM Cortex-M series core, which has sufficient processing power and rich GPIO interfaces to control various components. The vacuum pump 223 in the pressure regulating unit 22 can be a miniature DC brushless vacuum pump, whose speed can be precisely controlled by a PWM signal. The solenoid valve 221 can be a fast-response two-position three-way solenoid valve, such as a normally closed solenoid valve, which is opened by a high-level signal output from the main control unit 21, connecting the negative pressure chamber to the vacuum pump 223. The proportional valve 222 can be a high-precision electronically controlled proportional valve, whose opening degree can be linearly adjusted by an analog voltage signal or a PWM signal, such as a flow-controlled proportional valve, whose flow rate is linearly related to the control signal. The first pressure sensor 30 can be a high-precision digital pressure sensor, such as the MPX series pressure sensor, which can directly transmit the detected pressure data to the main control unit 21 via an I2C or SPI interface. In actual operation, when the user starts the skin treatment mechanism, the main control unit 21 first controls the solenoid valve 221 to open via the GPIO port, and simultaneously sends a high-frequency, high-duty-cycle PWM signal to the drive circuit of the vacuum pump 223, causing the vacuum pump 223 to quickly start pumping air at a first speed (e.g., 80% of the rated speed). The first pressure sensor 30 continuously collects the pressure data of the negative pressure chamber and sends the data to the main control unit 21 via the I2C bus. The main control unit 21 compares the collected first air pressure value with a preset target negative pressure value (e.g., -50kPa). When the first air pressure value reaches or exceeds -40kPa (i.e., the first air pressure difference is less than the preset threshold of 10kPa), the main control unit 21 adjusts the PWM signal sent to the vacuum pump 223, reducing its speed to a second speed (e.g., 30% of the rated speed), and simultaneously starts sending an adjustable PWM signal to the proportional valve 222 to control its opening. The main control unit 21 can run a PID control algorithm to dynamically adjust the opening of the proportional valve 222 based on the real-time feedback from the first pressure sensor 30. For example, if the first air pressure value is slightly higher than the target negative pressure value, the opening of the proportional valve is slightly increased to increase the air extraction volume; if the first air pressure value is slightly lower than the target negative pressure value, the opening of the proportional valve is slightly decreased to reduce the air extraction volume or allow a small amount of external air to enter (if the proportional valve is designed to have a pressure relief function), until the pressure in the negative pressure chamber stabilizes at the target value of -50 kPa.

[0052] Through the above technical solution, the air pressure regulating unit 22 is specifically designed as a structure consisting of a solenoid valve 221, a proportional valve 222, and a vacuum pump 223. In conjunction with the main control unit 21, the vacuum pump 223 undergoes two-stage speed control, and the proportional valve 222 is fine-tuned, making the pressure regulation process of the negative pressure chamber more efficient and precise. The vacuum pump 223 rapidly pumps air at its initial speed, quickly establishing negative pressure and shortening the time it takes for the negative pressure chamber to reach its initial negative pressure value, thus improving the equipment's working efficiency. Subsequently, by reducing the speed of the vacuum pump 223 and introducing the proportional valve 222 for fine adjustment, the problem of pressure overshoot or unstable regulation that might occur due to the continuous high-speed operation of the vacuum pump 223 is effectively avoided, ensuring that the pressure in the negative pressure chamber can be stabilized at the target negative pressure value with high precision. This strategy of combining coarse and fine adjustments not only improves the response speed of negative pressure control but also significantly enhances the accuracy and stability of negative pressure maintenance, thereby providing a more reliable and precise working environment for the electrode unit and optimizing the skin treatment effect.

[0053] Please see Figure 2 This application further proposes a pressure regulating unit 22 including a solenoid valve 221, a proportional valve 222, and a vacuum pump 223. The solenoid valve 221 is connected to a negative pressure chamber, and the negative pressure chamber and the external environment are respectively connected to the solenoid valve 221. The solenoid valve 221 is connected to the vacuum pump 223. One end of the proportional valve 222 is connected between the solenoid valve 221 and the vacuum pump 223, and the other end of the proportional valve 222 is used to connect to the external environment. The vacuum pump 223, the proportional valve 222, and the solenoid valve 221 are respectively electrically connected to the main control unit 21. The first pressure sensor 30 is connected between the solenoid valve 221 and the electrode unit. The main control unit 21 is also used to control the vacuum pump 223 to start and operate at a first speed; then, when the first pressure difference is less than a preset threshold, it controls the vacuum pump 223 to operate at a second speed and controls the opening of the proportional valve 222 for fine adjustment. In this embodiment, the proportional valve is connected in parallel in the pipeline.

[0054] Among them, solenoid valve 221 is a device that controls the opening and closing of a valve through electromagnetic force, used for quickly switching or opening the air passage. Its function is to quickly establish or release negative pressure during the coarse adjustment stage, or to act as an auxiliary switch during the fine adjustment process. Solenoid valve 221 can be a two-position three-way solenoid valve, which has one inlet, one outlet, and one exhaust port, and switches the airflow direction by switching the solenoid coil on and off; or it can be a two-position two-way solenoid valve, used for simple control of the air passage opening and closing. Proportional valve 222 is a valve that can continuously or proportionally adjust the airflow according to an input signal (such as voltage or current). Its main function is to precisely control the pressure in the negative pressure chamber during the fine adjustment stage to achieve the target negative pressure value. Proportional valve 222 can be a proportional solenoid valve, which changes the valve core position by adjusting the coil current, thereby controlling the opening of the airflow passage; or it can be a proportional pneumatic valve, which controls the valve opening through a gas pressure signal, and then controls the gas pressure signal through an electrical signal. Vacuum pump 223 is a device used to extract gas from a sealed space, thereby reducing the pressure within the space. Its function is to generate negative pressure, serving as the power source for creating negative pressure in the negative pressure chamber. The vacuum pump 223 can be a miniature diaphragm pump, which is small in size and low in noise, suitable for medical and aesthetic equipment; or a piston pump, which has a simple structure, is easy to maintain, and can provide stable pumping capacity. The solenoid valve 221 is connected to the negative pressure chamber, and both the negative pressure chamber and the external environment are connected to the solenoid valve 221. This connection method allows the solenoid valve 221 to directly control the opening and closing of the negative pressure chamber and the external environment, thereby achieving rapid coarse adjustment of the negative pressure chamber pressure. The solenoid valve 221 is connected to the vacuum pump 223, ensuring that the negative pressure generated by the vacuum pump 223 can act on the negative pressure chamber through the solenoid valve 221. One end of the proportional valve 222 is connected between the solenoid valve 221 and the vacuum pump 223, and the other end of the proportional valve 222 is used to connect to the external environment. This unique connection method allows the proportional valve 222 to accurately introduce outside air during the fine-tuning stage, thereby fine-tuning the pressure in the negative pressure chamber. Vacuum pump 223, proportional valve 222, and solenoid valve 221 are electrically connected to main control unit 21, ensuring that main control unit 21 can independently control these three key components. First pressure sensor 30 is connected between solenoid valve 221 and electrode unit, ensuring that first pressure sensor 30 can detect the pressure of the negative pressure chamber closest to the electrode unit in real time and accurately. Main control unit 21 is also used to control vacuum pump 223 to start and operate at a first speed; this is the initial operation of the coarse adjustment stage, which can quickly establish a preliminary negative pressure in the negative pressure chamber.When the first pressure difference is less than the preset threshold, the vacuum pump 223 is controlled to run at the second speed, and the opening of the proportional valve 222 is finely adjusted. When the pressure in the negative pressure chamber is close to the target negative pressure value, in order to avoid overshoot and improve the stability of fine adjustment, the vacuum pump 223 will switch to a lower speed. At the same time, the main control unit 21 will activate the proportional valve 222 and precisely introduce outside air by adjusting its opening. This works in conjunction with the pumping action of the vacuum pump 223 to achieve fine adjustment of the pressure in the negative pressure chamber.

[0055] The skin treatment mechanism of this application, under the control of the main control unit 21, precisely controls the pressure of the negative pressure chamber through the air pressure regulating unit 22. When a negative pressure needs to be established, the main control unit 21 first controls the solenoid valve 221 to switch to the state connected to the vacuum pump 223, while simultaneously closing the passage to the external environment. Subsequently, the main control unit 21 starts the vacuum pump 223 and runs it at a first speed to quickly extract air from the negative pressure chamber, causing the pressure in the negative pressure chamber to drop rapidly. The first pressure sensor 30 detects the pressure of the negative pressure chamber in real time and feeds back the detected first air pressure value to the main control unit 21. The main control unit 21 compares this first air pressure value with a preset target negative pressure value and calculates the first air pressure difference. When the first air pressure difference is large, the vacuum pump 223 continues to run at the first speed, quickly coarsely adjusting the pressure of the negative pressure chamber to a range close to the target negative pressure value. Once the first pressure difference decreases and falls below a preset threshold, it indicates that the pressure in the negative pressure chamber is approaching the target value. At this point, the main control unit 21 adjusts the operating state of the vacuum pump 223 to operate at a second speed, which is typically lower than the first speed, to reduce the pumping rate and prevent pressure overshoot. Simultaneously, the main control unit 21 begins controlling the opening of the proportional valve 222. One end of the proportional valve 222 is connected to the gas path between the solenoid valve 221 and the vacuum pump 223, and the other end is connected to the external environment. By precisely adjusting the opening of the proportional valve 222, the main control unit 21 can control a small amount of outside air to enter the gas path, forming a dynamic balance with the pumping action of the vacuum pump 223. The first pressure sensor 30 continuously provides feedback on the real-time pressure of the negative pressure chamber. Based on the feedback of the first pressure value, the main control unit 21 dynamically adjusts the opening of the proportional valve 222, thereby achieving fine-tuning of the negative pressure chamber pressure until the negative pressure chamber pressure precisely reaches the target negative pressure value. This strategy of combining coarse and fine adjustment, along with the coordinated control of the speed of vacuum pump 223 and the opening of proportional valve 222, makes the pressure regulation process of the negative pressure chamber both fast and precise, effectively solving the problems of slow response and low accuracy in traditional negative pressure regulation.

[0056] In one specific implementation, the main control unit 21 of the skin treatment mechanism can employ a high-performance microcontroller, such as the STM32F407 chip based on an ARM Cortex-M series processor, which has sufficient processing power and rich GPIO interfaces to control the various components of the air pressure regulating unit 22. The solenoid valve 221 in the air pressure regulating unit 22 can be a fast-response, well-sealed two-position three-way solenoid valve, with its normally closed port connected to the vacuum pump 223, its normally open port connected to the external environment, and its common port connected to the negative pressure chamber. The vacuum pump 223 can be a miniature brushless DC vacuum pump, whose speed can be precisely controlled by a PWM signal. The proportional valve 222 can be a high-precision proportional solenoid valve, whose opening degree is adjusted by an analog voltage signal or a PWM signal, with one end connected to the air path between the solenoid valve 221 and the vacuum pump 223, and the other end exposed to the atmosphere. The first pressure sensor 30 can be a high-sensitivity digital pressure sensor, such as the MPX5010 series, whose output signal can be directly read by the main control unit 21. In actual operation, when the user activates the skin treatment mechanism and sets the target negative pressure value, the main control unit 21 first sends a command to the solenoid valve 221, switching it to the state of connecting the vacuum pump 223 and the negative pressure chamber. Then, the main control unit 21 controls the vacuum pump 223 to start at a first speed (e.g., 80% of the rated speed) to quickly draw air from the negative pressure chamber. The first pressure sensor 30 continuously monitors the pressure in the negative pressure chamber. When the main control unit 21 detects that the difference between the negative pressure chamber pressure and the target negative pressure value (the first air pressure difference) is less than a preset threshold (e.g., 5 kPa), the main control unit 21 reduces the speed of the vacuum pump 223 to a second speed (e.g., 30% of the rated speed) and begins to adjust the opening of the proportional valve 222. The main control unit 21 can calculate and output a control signal to the proportional valve 222 in real time according to the PID control algorithm, causing its opening to continuously change between 0% and 100%, thereby accurately introducing outside air and stabilizing the pressure in the negative pressure chamber at the target negative pressure value. For example, if the pressure in the negative pressure chamber is slightly lower than the target value, the main control unit 21 will slightly increase the opening of the proportional valve 222 to introduce more air; if the pressure is slightly higher than the target value, the opening will be slightly reduced.

[0057] Through the above technical solution, the air pressure regulating unit 22 of the skin treatment mechanism adopts a combination configuration of solenoid valve 221, proportional valve 222, and vacuum pump 223, and optimizes the connection relationship between them. In particular, the proportional valve 222 is uniquely designed to connect between solenoid valve 221 and vacuum pump 223 and be connected to the external environment. This structure allows the main control unit 21 to quickly and coarsely adjust the negative pressure through the first rotation speed of vacuum pump 223, and then, when the pressure approaches the target value, to achieve precise control of the negative pressure chamber pressure by combining the second rotation speed of vacuum pump 223 with the opening degree of proportional valve 222. This phased and coordinated control strategy effectively solves the problems of slow response speed or insufficient adjustment accuracy of single adjustment methods, ensuring that the negative pressure chamber pressure can quickly, stably, and accurately reach the preset target negative pressure value, thereby providing an ideal negative pressure environment for the electrode unit to work and significantly improving the efficiency and treatment effect of skin treatment. At the same time, this fine pressure control also helps to reduce skin irritation and improve user comfort and safety.

[0058] Please see Figure 1 This application further proposes that the main control unit 21 is specifically used for: fine-tuning the opening of the proportional valve 222 in response to the control of the valve opening, and adjusting the opening of the proportional valve according to a preset control mode; wherein the control mode is any one of the following: continuous control mode: the opening of the proportional valve 222 is continuously changed within a range of greater than 0% to less than 100%; fourth-order and above control mode: the opening of the proportional valve 222 is sequentially adjusted to a first preset opening value, a second preset opening value, a third preset opening value, a fourth preset opening value and / or an Nth preset opening value, wherein N is greater than four.

[0059] The phrase "responding to the fine adjustment of the opening of the proportional valve 222, adjusting the opening of the proportional valve according to a preset control mode" indicates that when finely adjusting the first air pressure value of the negative pressure chamber, the main control unit 21 no longer simply controls the opening of the proportional valve 222, but performs adjustment according to a preset strategy or algorithm. The preset control mode can be stored in the memory of the main control unit 21 and recalled according to actual needs or user selection. For example, it can automatically select an appropriate control mode based on the first air pressure difference between the target negative pressure value and the first air pressure value, or based on different treatment stages. "Continuous control mode: controlling the opening of the proportional valve 222 to change continuously within a range greater than 0% to less than 100%" means that the opening of the proportional valve 222 can be smoothly and steplessly adjusted within its effective operating range (typically between 0% and 100%, excluding extreme cases of complete closure or full opening to maintain a certain control margin). This mode allows the main control unit 21 to make extremely fine and real-time adjustments to the negative pressure to cope with minor pressure fluctuations or achieve specific pressure curves. For example, continuous control of the opening of the proportional valve 222 can be achieved through analog signal output, duty cycle adjustment of pulse width modulation (PWM) signals, etc. "Fourth-order and above control mode: controlling the opening of the proportional valve 222 to sequentially adjust to the first preset opening value, the second preset opening value, the third preset opening value, the fourth preset opening value, and / or the Nth preset opening value, where N is greater than four" means that the opening of the proportional valve 222 is set to a series of discrete, predefined opening values. The main control unit 21 can switch the opening of the proportional valve 222 to any one of these specific preset values ​​as needed. This mode is suitable for scenarios requiring rapid switching to several fixed negative pressure levels, or when the system's accuracy requirements for negative pressure are met within a certain range. For example, these preset opening values ​​can correspond to different treatment intensity levels, and the step-wise opening adjustment of the proportional valve 222 can be achieved through digital signals or stepper motor control.

[0060] The solution of this application is that, in the above-mentioned skin treatment mechanism, when the main control unit 21 needs to finely adjust the first air pressure value of the negative pressure chamber according to the first air pressure difference, it no longer adopts a single control strategy, but adjusts the opening of the proportional valve 222 according to the preset control mode.

[0061] Specifically, the main control unit 21 can select either a "continuous control mode" or a "fourth-order or higher control mode" based on actual treatment needs or user settings. If the continuous control mode is selected, the main control unit 21 outputs continuously varying control signals, allowing the opening of the proportional valve 222 to be smoothly and steplessly adjusted within its effective operating range. This continuous adjustment capability enables extremely precise control of the initial air pressure value within the negative pressure chamber, thus stably maintaining it at the target negative pressure value and effectively compensating for minor pressure fluctuations caused by changes in skin adhesion or environmental factors. If the fourth-order or higher control mode is selected, the main control unit 21 will sequentially adjust the opening of the proportional valve 222 to a series of discrete, pre-set opening values ​​according to a preset program. This step-by-step adjustment method allows the system to quickly and accurately switch to multiple specific negative pressure levels, meeting the specific requirements of different treatment stages or different skin types for negative pressure intensity. By introducing these preset control modes, the main control unit 21 can control the opening of the proportional valve 222 more flexibly and precisely, thereby improving the stability and accuracy of the negative pressure when fine-tuning it, and enhancing the system's adaptability to different treatment scenarios.

[0062] The following is a specific example. As a concrete implementation, the main control unit 21 can be a high-performance microcontroller, such as an STM32 series chip based on the ARM Cortex-M4 core. When fine-tuning of the opening of the proportional valve 222 is required, if continuous control mode is selected, the main control unit 21 can generate a pulse width modulation (PWM) signal. The duty cycle of this PWM signal can continuously vary within, for example, a range of 10% to 90%. This PWM signal, after passing through a drive circuit, directly controls the electromagnetic coil of the proportional valve 222, thereby achieving continuous and smooth adjustment of the opening of the proportional valve 222. For example, when it is necessary to fine-tune the negative pressure from -50 kPa to -52 kPa, the main control unit 21 can gradually increase the duty cycle of the PWM signal, causing the opening of the proportional valve 222 to slowly increase until the negative pressure detected by the first pressure sensor 30 reaches -52 kPa. If a fourth-order or higher control mode is selected, the main control unit 21 can pre-store a set of discrete opening values, for example, corresponding to openings of 25%, 50%, 75%, and 100%. When fine-tuning of the negative pressure is required, the main control unit 21 can select the closest preset opening value from these preset values ​​based on the difference between the current negative pressure and the target negative pressure. For example, the main control unit 21 can control a stepper motor through a digital output port. This stepper motor is connected to the adjustment mechanism of the proportional valve 222. By controlling the number of steps of the stepper motor, the opening of the proportional valve 222 can be precisely stopped at the first preset opening value, the second preset opening value, etc. For example, when it is necessary to quickly switch from -40kPa to -60kPa, the main control unit 21 can directly adjust the opening of the proportional valve 222 from a lower preset value to a higher preset value, thereby achieving a rapid step-like change in negative pressure.

[0063] Through the above technical solution, when fine-tuning the first air pressure value of the negative pressure chamber, the main control unit 21 can flexibly adjust the opening of the proportional valve 222 according to the preset control mode. This refined control strategy makes the negative pressure adjustment process more accurate and stable.

[0064] Specifically, the continuous control mode enables stepless and smooth adjustment of negative pressure, effectively avoiding skin irritation caused by sudden pressure changes and ensuring extremely high stability of negative pressure around the target value. This is particularly important for treatment scenarios requiring the maintenance of a specific negative pressure for extended periods. The fourth-level and higher control modes provide rapid and repeatable switching between negative pressure levels, simplifying the operation process and ensuring consistency of negative pressure across different treatment intensities. Therefore, this solution significantly improves the precision, stability, and adaptability of negative pressure control in skin treatment facilities, thereby better meeting diverse skin treatment needs and enhancing treatment outcomes and user experience.

[0065] Please see Figure 1This application further proposes to finely adjust the driving current of the proportional valve in response to the opening of the proportional valve 222, either continuously or in discrete sets of preset current values.

[0066] When the main control unit 21 determines that the first pressure difference is less than a preset threshold, it needs to finely adjust the pressure in the negative pressure chamber. This fine adjustment is achieved by changing the opening of the proportional valve 222. The change in the opening of the proportional valve 222 directly affects the size of the airflow channel between the negative pressure chamber and the external environment or the vacuum pump 223, thereby achieving precise control of the pressure in the negative pressure chamber. The opening of the proportional valve 222 is usually achieved by controlling its drive current. "Continuously adjusting the drive current of the proportional valve" means adjusting the drive current of the proportional valve to change continuously and steplessly within its operating range. For example, the main control unit 21 can output an analog voltage signal, which is converted into a continuously changing current signal by the drive circuit, thus allowing the opening of the proportional valve 222 to change continuously from minimum to maximum. This method provides extremely high adjustment accuracy and is suitable for scenarios requiring very smooth and precise pressure control. "Adjusting the drive current of the proportional valve with discrete preset current values" means adjusting the drive current of the proportional valve in a fourth-order or higher manner, with each order corresponding to one drive current. For example, the main control unit 21 can be set to four levels, and the corresponding drive current for each level can be output by controlling the drive circuit through digital signals. This method is simple to implement, has clear control logic, and is suitable for scenarios where the accuracy requirements are relatively low but a fast response is needed, or it can be matched with preset fourth-level or higher control modes.

[0067] In the skin treatment mechanism of this application, when the main control unit 21 determines the first air pressure difference by comparing the first air pressure value with the target negative pressure value, and determines that the difference needs to be fine-tuned, the main control unit 21 sends a control signal to the proportional valve 222. In order to achieve precise control of the opening degree of the proportional valve 222, this solution achieves this by adjusting the magnitude of the driving current of the proportional valve 222.

[0068] Specifically, the main control unit 21 can output corresponding control signals according to the fine-tuning requirements, enabling the drive circuit of the proportional valve 222 to continuously change its drive current, thereby allowing the opening of the proportional valve 222 to change smoothly throughout the entire adjustment range, achieving stepless fine adjustment of the pressure in the negative pressure chamber. Alternatively, the main control unit 21 can also output discrete control signals according to a preset control mode, causing the drive current of the proportional valve 222 to switch according to different steps of the drive current, thereby adjusting the opening of the proportional valve 222 in a stepwise manner. This method of directly controlling the drive current concretizes the abstract "opening adjustment" into operable electrical parameter control, ensuring the accuracy and stability of the opening adjustment of the proportional valve 222, thus enabling the pressure in the negative pressure chamber to accurately and quickly reach the target negative pressure value, meeting the precise pressure requirements of the electrode unit.

[0069] The following is a specific example. As a concrete implementation, when continuous adjustment of the drive current of the proportional valve 222 is required, the main control unit 21 can output a pulse width modulation (PWM) signal. This PWM signal passes through a current drive circuit, converting the duty cycle of the PWM signal into the continuously varying drive current required by the proportional valve 222. For example, by changing the duty cycle of the PWM signal from 0% to 100%, the drive current can be continuously varied from the minimum effective value to the maximum effective value, thereby achieving smooth, stepless adjustment of the opening of the proportional valve 222.

[0070] In another implementation, when it is necessary to adjust the drive current of the proportional valve 222 with discrete preset current values, the main control unit 21 can pre-store multiple current setting values ​​and select one of them according to the fine-tuning requirements. For example, the main control unit 21 can control a multiplexer through a digital output port to connect resistors of different resistance values ​​to the drive circuit of the proportional valve 222, thereby generating multiple discrete drive current values. Alternatively, the main control unit 21 can send a digital command to a digital-to-analog converter (DAC), which outputs a corresponding analog voltage signal, which is then converted into preset discrete current values ​​through a current drive circuit to achieve step-wise adjustment of the opening of the proportional valve 222.

[0071] The above technical solution transforms the opening adjustment of the proportional valve 222 into precise control of its driving current, making the pressure fine-tuning process of the negative pressure chamber more stable and accurate. Whether using continuous adjustment or discrete preset current value adjustment, it effectively avoids opening uncertainties caused by mechanical structure or external interference, thus ensuring that the electrode unit operates under precise target negative pressure. This not only improves the control precision and reliability of the skin treatment mechanism but also provides users with a safer and more effective skin treatment experience.

[0072] Please see Figure 1This application further proposes that the skin treatment mechanism also includes a second pressure sensor 40 connected between the solenoid valve 221 and the proportional valve 222, for detecting the regulating air pressure of the proportional valve 222; the second pressure sensor 40 is electrically connected to the main control unit 21; the main control unit 21 is also used to acquire the second air pressure value detected by the second pressure sensor 40 between the solenoid valve 221 and the proportional valve 222; the main control unit 21 is also used to determine that there is a blockage or leakage between the solenoid valve 221 and the proportional valve 222 when the first air pressure value and the second air pressure value are not equal, and to issue a prompt or alarm.

[0073] The second pressure sensor 40 is a device for measuring gas pressure, converting the measured pressure value into an electrical signal output. This sensor can be a piezoresistive pressure sensor, a capacitive pressure sensor, a piezoelectric pressure sensor, or a MEMS (Micro-Electro-Mechanical Systems) pressure sensor. These sensors typically offer high accuracy, fast response, and good stability, adapting to the working environment of the skin treatment facility. Its function is to monitor the gas pressure in the pipeline between the solenoid valve 221 and the proportional valve 222 in real time, providing crucial data for diagnosing internal anomalies. The main control unit 21 obtains the second gas pressure value in the pipeline between the solenoid valve 221 and the proportional valve 222 by reading the output signal of the second pressure sensor 40. The main control unit 21 can integrate an analog-to-digital converter (ADC) to convert the analog pressure signal into a digital signal for processing, or it can directly read data from the digital pressure sensor via a digital interface (such as SPI or I2C). The data acquisition frequency can be set according to system response requirements, for example, tens or hundreds of times per second.

[0074] The main control unit 21 compares the second air pressure value with the target negative pressure value to confirm the second air pressure difference. Through comparison, the main control unit 21 can quantify the deviation between the actual pressure in the pipeline between the solenoid valve 221 and the proportional valve 222 and the expected target negative pressure value. The processor inside the main control unit 21 performs a subtraction operation, that is, "the second air pressure difference equals the target negative pressure value minus the second air pressure value". This target negative pressure value is the final air pressure value that the system presets and expects to achieve in the negative pressure chamber. The main control unit 21 compares the first air pressure difference value and the second air pressure difference value to determine whether there is a blockage or leakage between the solenoid valve 221 and the proportional valve 222. By comparing the first air pressure difference value and the second air pressure difference value, the main control unit 21 can infer whether there is an abnormality in the pipeline inside the air pressure regulating unit 22 (especially between the solenoid valve 221 and the proportional valve 222). The main control unit 21 can set one or more thresholds. For example, if the difference between the first and second air pressure differences exceeds a preset threshold, or if the second air pressure difference deviates significantly from the expected range during a specific operating phase, it is judged as a blockage or leak. Blockage may prevent the second air pressure from being effectively reduced, while leakage may prevent the second air pressure from being maintained. Prompts or alarms are issued in case of abnormalities to promptly inform users or operators of internal system faults so that appropriate measures can be taken. Prompts or alarms can be implemented in various ways, such as displaying error codes or text information on the device screen; issuing audible alarms via buzzer or speaker; flashing or changing the color of indicator lights (such as LEDs); or sending alarm information to remote monitoring equipment or mobile terminals via a wireless communication module.

[0075] The solution in this application adds a second pressure sensor 40 between the solenoid valve 221 and the proportional valve 222, and the main control unit 21 obtains the second air pressure value at this location. The main control unit 21 not only uses the first pressure sensor 30 to detect the pressure in the negative pressure chamber and calculate the first air pressure difference, but also uses the second pressure sensor 40 to detect the pressure in the intermediate pipeline and calculate the second air pressure difference. By comparing these first and second air pressure differences, the main control unit 21 can intelligently determine whether there is a blockage or leakage between the solenoid valve 221 and the proportional valve 222 inside the air pressure regulating unit 22. This dual pressure monitoring and comparison mechanism allows the system to more accurately diagnose internal faults, rather than simply detecting that the final negative pressure is not up to standard. When the first air pressure difference indicates an abnormal pressure in the negative pressure chamber, and the second air pressure difference also shows a large deviation from the target negative pressure value, it can be inferred that the problem may lie in the solenoid valve 221, the proportional valve 222, or their connecting pipelines. Conversely, if the second pressure difference is normal while the first pressure difference is abnormal, the problem may lie in the piping or electrode unit itself, after the second pressure sensor 40 and before the first pressure sensor 30. This meticulous fault location capability significantly improves the reliability and maintenance efficiency of the entire skin treatment mechanism.

[0076] Through the above technical solution, the skin treatment unit can monitor the working status of key components inside the air pressure regulating unit 22 (such as the solenoid valve 221 and the proportional valve 222) in real time, and promptly detect and diagnose abnormalities such as blockages or leaks. This not only improves the stability and safety of system operation and avoids inaccurate pressure control caused by internal faults, ensuring the accuracy and effectiveness of radiofrequency electrode therapy or electrode therapy, but also provides users or maintenance personnel with clear fault location information, thereby greatly reducing the difficulty of fault diagnosis and maintenance costs, and extending the service life of the equipment.

[0077] Please see Figure 1 This application further proposes that the vacuum pump 223 includes a pump body and a brushless DC motor connected to the pump body. The pump body is connected to a proportional valve 222. The brushless DC motor is provided with a half-bridge drive circuit, which is electrically connected to the main control unit 21. The main control unit 21 is also used to send a PWM signal to the half-bridge drive circuit to control the speed of the brushless DC motor and control the pumping volume of the vacuum pump 223.

[0078] The pump body of vacuum pump 223 is the core component for generating negative pressure. It mechanically extracts gas from the negative pressure chamber, thereby reducing the pressure inside. The design of the pump body directly affects the pumping efficiency and stability. The brushless DC motor connected to the pump body is a high-efficiency, long-life motor with a wide speed range. It controls the current direction via an electronic commutator, enabling precise speed control. The connection between the pump body and proportional valve 222 ensures that the negative pressure generated by vacuum pump 223 can be regulated by the proportional valve, thus affecting the pressure in the negative pressure chamber. The brushless DC motor has a half-bridge drive circuit, typically composed of two switching transistors, used to drive the phase windings of the brushless DC motor. Its structure is relatively simple and easy to implement PWM speed regulation. The half-bridge drive circuit is electrically connected to the main control unit 21, allowing the main control unit 21 to directly control the operating state of the drive circuit, thereby indirectly controlling the operation of the brushless DC motor.

[0079] The main control unit 21 precisely controls the average voltage applied to the brushless DC motor windings by sending a PWM signal (Pulse Width Modulation) to the half-bridge drive circuit, thereby adjusting the speed of the brushless DC motor. By changing the duty cycle of the PWM signal, fine adjustment of the brushless DC motor speed can be achieved, thus controlling the pumping volume of the vacuum pump 223. In addition to the PWM signal, the main control unit can also control the motor driver through analog voltage signals or digital communication protocols, thereby adjusting the motor speed.

[0080] The proposed solution combines a vacuum pump 223 with a brushless DC motor and utilizes a main control unit 21 to precisely control the speed of the brushless DC motor via a half-bridge drive circuit, thereby achieving fine adjustment of the pumping volume of the vacuum pump 223. When the pressure in the negative pressure chamber needs fine adjustment, the main control unit 21 not only controls the opening of the proportional valve 222 but also precisely controls the speed of the vacuum pump 223 based on the first pressure difference, ensuring stable operation at the second speed. This direct and precise control of the vacuum pump 223's speed allows it to provide a more stable and controllable negative pressure source. When the pumping volume of the vacuum pump 223 is already within a more precise control range, the fine-tuning effect of the proportional valve 222 becomes more effective and stable. The two work together to ensure that the pressure in the negative pressure chamber can quickly and accurately reach and maintain the target negative pressure value. This integrated control method significantly improves the accuracy and stability of negative pressure regulation, effectively solving the problems of pressure fluctuations and inaccurate control that may occur during fine-tuning.

[0081] The following is a specific example. The vacuum pump 223 can be a miniature brushless DC diaphragm pump, with a compact pump body structure suitable for integration into skin treatment mechanisms. The brushless DC motor can be a three-phase brushless DC motor, with a permanent magnet rotor and a rotating magnetic field achieved through electronic commutation of the stator windings. The half-bridge drive circuit can consist of two N-channel MOSFETs, controlling the MOSFET gates via a PWM signal to achieve on / off control of the motor windings. For example, an integrated motor driver chip can be used, which integrates the half-bridge drive circuit and provides a PWM input interface. The main control unit 21 can be an STM32 series microcontroller, which integrates a PWM generator capable of generating PWM signals with adjustable duty cycles. The main control unit 21 can calculate the required PWM signal duty cycle based on the magnitude of the first pressure difference using a lookup table method or a PID control algorithm, and then send this PWM signal to the half-bridge drive circuit. For example, when it is necessary to reduce the negative pressure, the main control unit 21 can reduce the duty cycle of the PWM signal, thereby reducing the speed of the brushless DC motor and decreasing the pumping volume.

[0082] Through the above technical solution, the rotation speed of the vacuum pump 223 can be precisely and flexibly controlled by the main control unit 21, thereby providing a more stable and controllable negative pressure source. This enables the target negative pressure value to be reached and maintained more accurately during the fine-tuning of the negative pressure chamber, effectively solving the problems of pressure fluctuation and unstable adjustment caused by inaccurate vacuum pump speed control in traditional solutions, and significantly improving the accuracy and stability of negative pressure control in skin treatment mechanisms during radiofrequency electrode treatment or electrode treatment.

[0083] Please see Figure 1This application further proposes that the aforementioned skin treatment mechanism also includes a handle 10, a main unit 20, a first filter 50, and a second filter 60. The handle 10 is provided with a negative pressure pipeline, and the negative pressure chamber is connected to the negative pressure pipeline. The first filter 50 is located in the negative pressure chamber and adjacent to the negative pressure pipeline, and is used to filter skin flakes and impurities flowing out of the negative pressure chamber. The main unit 20 also includes a housing, in which the main control unit 21, solenoid valve 221, proportional valve 222, and vacuum pump 223 are all installed. The housing is provided with an interface connected to the solenoid valve 221. The second filter 60 is installed at the interface and is used to filter skin flakes and impurities entering the housing.

[0084] The handle 10 is the part of the skin treatment mechanism that the user holds and operates. It typically integrates electrode units and connects to negative pressure tubing. The design of the handle 10 needs to consider ergonomics to provide a comfortable grip and easy operation, ensuring that the electrode units can stably conform to the skin to form an effective negative pressure chamber. The handle 10 can be made of lightweight, corrosion-resistant materials, such as medical-grade plastic or lightweight alloys, and its shape can be designed in various forms, such as pen-shaped, gun-shaped, or disc-shaped, depending on the actual usage scenario.

[0085] The main unit 20 is the core control and power unit of the skin treatment mechanism, integrating major functional components such as the main control unit 21 and the air pressure regulation unit 22 (including solenoid valve 221, proportional valve 222, and vacuum pump 223). The main unit 20 is responsible for providing stable power, control signals, and air pressure to drive the entire skin treatment process. The main unit 20 can be designed as a desktop device, connected to the handle 10 via a flexible hose, or as an integrated portable device, integrating all components into a compact structure.

[0086] The negative pressure pipeline is the channel connecting the negative pressure chamber and the air pressure regulating unit 22, used to transmit negative pressure. This pipeline needs to possess good airtightness, flexibility, and durability to ensure the efficiency and stability of negative pressure transmission. The negative pressure pipeline can be made of materials such as medical-grade silicone tubing, polyurethane tubing, or PVC tubing. Its inner diameter and length can be optimized according to the negative pressure transmission requirements and equipment structure to reduce pressure loss.

[0087] The first filter 50 is used to initially filter skin flakes and impurities inhaled from the skin surface within the negative pressure chamber, preventing them from entering the negative pressure pipeline and the subsequent air pressure regulating unit 22. The first filter 50 is typically located at the connection between the negative pressure chamber and the negative pressure pipeline, i.e., near the air outlet of the electrode unit. The first filter 50 can employ structures such as porous sponge, fiber mesh, sintered filter element, or microporous membrane. Its filtration accuracy and airflow rate need to be selected according to actual application requirements to ensure effective filtration without significantly affecting the establishment and maintenance of negative pressure.

[0088] The second filter 60 is installed on the housing of the main unit 20 at the interface that connects to the solenoid valve 221, serving as the final protective barrier for the air pressure regulating unit 22. The second filter 60 can be a high-efficiency air filter (such as a HEPA filter), an activated carbon filter, or a multi-layer composite filter to provide a higher level of filtration, ensuring the cleanliness of the gas entering the solenoid valve 221, the proportional valve 222, and the vacuum pump 223, thereby extending the service life of these precision components.

[0089] The housing is the external protective structure of the main unit 20, used to house and protect core components such as the internal main control unit 21, solenoid valve 221, proportional valve 222, and vacuum pump 223, and to provide structural support. The housing is typically made of robust and durable materials, such as engineering plastics (e.g., ABS, PC) or metal alloys, to resist external impacts and environmental influences. The housing design also needs to consider heat dissipation, noise control, and integration with the user interface.

[0090] An interface is a connection point on the housing used to connect to external pipes or components. In this embodiment, it specifically refers to the external interface connected to the solenoid valve 221 for connecting to a negative pressure pipeline. The interface needs to have good airtightness and connection reliability to facilitate the user's connection and disconnection of the handle 10. The interface can take the form of a quick-connect fitting, threaded connection, or snap-fit ​​connection to ensure the convenience and safety of the connection.

[0091] During the operation of the skin treatment mechanism, the electrode unit adheres to the skin to form a negative pressure chamber. To achieve precise control of the pressure in the negative pressure chamber, the main control unit 21 controls the air pressure regulating unit 22 to perform coarse and fine adjustments. In this process, to protect the precision components in the air pressure regulating unit 22, the skin treatment mechanism of this application incorporates two-stage filtration along the negative pressure suction path.

[0092] Specifically, when the electrode unit operates and forms a negative pressure chamber, air within the chamber, along with any skin flakes and impurities, is drawn in through the negative pressure pipeline. Inside the negative pressure chamber, a first filter 50, located near the inlet of the negative pressure pipeline, performs preliminary filtration of these inhaled substances, trapping larger particles of skin flakes and impurities, thereby effectively reducing the total amount of contaminants entering the negative pressure pipeline. The gas, preliminarily filtered by the first filter 50, is then transmitted to the main unit 20 through the negative pressure pipeline. The main unit 20 has an interface connected to the solenoid valve 221, where a second filter 60 is installed. The second filter 60 performs a secondary fine filtration of the gas entering the pressure regulating unit 22, further removing tiny particles that may have penetrated the first filter 50 or impurities generated during pipeline transmission. The clean gas, after two stages of filtration, then enters the core components of the pressure regulating unit 22, including the solenoid valve 221, the proportional valve 222, and the vacuum pump 223. This dual filtration mechanism ensures the cleanliness of the internal environment of the pressure regulating unit 22, significantly reducing the risk of failure of the precision valves and vacuum pump 223 due to impurities clogging or wear. This ensures the stability and reliability of the main control unit 21 in accurately coarsely and finely adjusting the pressure of the negative pressure chamber, enabling the electrode unit to work continuously and efficiently, and extending the service life of the entire skin treatment mechanism.

[0093] In one specific implementation, the handle 10 of the skin treatment device can be integrally molded from medical-grade ABS plastic, with an integrated electrode unit inside, and connected to the negative pressure pipeline via a quick-connect connector. The first filter 50 can be a removable and replaceable sintered polyethylene filter element with a pore size of 50 micrometers, located at the air outlet of the negative pressure chamber inside the handle 10. The housing of the main unit 20 can be injection molded from PC-ABS alloy, possessing good strength and corrosion resistance. Core components such as the main control unit 21, solenoid valve 221, proportional valve 222, and vacuum pump 223 are all fixedly installed inside the main unit 20. The interface on the housing of the main unit 20 that connects to the solenoid valve 221 can be a standardized Luer connector, facilitating connection to the negative pressure pipeline. The second filter 60 can be a capsule filter, installed inside the Luer connector, ensuring that the gas entering the pressure regulating unit 22 meets medical cleanliness standards.

[0094] Through the above technical solution, a handle 10, a main unit 20, a negative pressure pipeline, and a two-stage filtration system are introduced into the skin treatment mechanism, namely a first filter 50 and a second filter 60. The first filter 50 is located inside the negative pressure chamber and adjacent to the negative pressure pipeline, effectively intercepting larger particles of skin debris and impurities drawn in from the skin surface, preventing them from entering the negative pressure pipeline. The second filter 60 is installed at the interface of the main unit 20's housing, performing secondary fine filtration on the gas entering the pressure regulating unit 22. This dual filtration mechanism significantly improves the cleanliness of the gas entering the pressure regulating unit 22, thereby effectively avoiding performance degradation or malfunction of precision components such as the solenoid valve 221, proportional valve 222, and vacuum pump 223 due to impurities clogging, wear, or corrosion. This not only ensures the stability and reliability of the main control unit 21 in precisely controlling the pressure of the negative pressure chamber and ensures the continuous and efficient operation of the electrode unit, but also significantly extends the service life of the entire skin treatment mechanism, reduces maintenance costs, and improves user experience and treatment safety.

[0095] The system noise can be reduced by installing a silencer 70 at the inlet of the proportional valve 222 and a silencer 80 at the inlet of the vacuum pump 223.

[0096] Please see Figure 1 This application further proposes that the main control unit 21 is also used to set the target negative pressure value required by the user based on different degrees of skin laxity.

[0097] "Based on different degrees of skin laxity" refers to assessing the elasticity, firmness, and other characteristics of the user's skin before skin treatment. Skin laxity is an important indicator of skin health and aging, and its assessment can be conducted in various ways. For example, the degree of skin laxity can be determined through visual observation and palpation by professionals; alternatively, specialized skin testing equipment, such as elastography devices or image analysis systems, can be used to quantitatively analyze the mechanical properties or surface texture of the skin, thereby obtaining objective data on the degree of skin laxity. Alternatively, users can determine the degree through self-assessment based on preset descriptions or images. "Setting the target negative pressure value required by the user" refers to determining a suitable target negative pressure value for the negative pressure chamber based on the skin laxity assessed above. This target negative pressure value is the ideal pressure level that the negative pressure chamber should achieve when the electrode unit is working. For example, for users with tighter skin, a relatively higher negative pressure value may be needed to ensure the adhesion of the radiofrequency electrode or electrode; while for users with looser skin, a relatively lower negative pressure value may be needed to avoid excessive stretching or damage to the skin. This setting can be achieved through preset lookup tables, algorithm models, or user interface selection.

[0098] The solution proposed in this application optimizes the overall workflow of the skin treatment mechanism by enabling the main control unit 21 to set the target negative pressure value required by the user based on different degrees of skin laxity. Specifically, before the electrode unit adheres to the skin to form a negative pressure chamber and is ready to adjust the pressure, the main control unit 21 first acquires or receives information about the user's skin laxity. Based on this information, the main control unit 21 no longer uses a single fixed target negative pressure value, but intelligently calculates or selects a personalized target negative pressure value according to the user's specific skin condition. This personalized target negative pressure value is then used as the final target of the pressure adjustment process. The main control unit 21 controls the air pressure adjustment unit 22 to perform coarse adjustment so that the pressure in the negative pressure chamber reaches a first air pressure value, and then compares this first air pressure value with the personalized target negative pressure value to determine a first air pressure difference. Finally, based on this first air pressure difference, the main control unit 21 precisely controls the air pressure adjustment unit 22 to fine-tune the pressure in the negative pressure chamber so that it accurately reaches the personalized target negative pressure value from the first air pressure value, thereby ensuring that the electrode unit operates in a negative pressure environment most suitable for the user's skin condition. This mechanism makes the entire pressure regulation process more targeted, better adaptable to the physiological characteristics of different users, and improves the accuracy and safety of treatment.

[0099] As a specific implementation, the main control unit 21 can have a built-in database of the correspondence between skin laxity and target negative pressure values. For example, the database can store skin laxity levels such as "mild laxity," "moderate laxity," and "severe laxity," each corresponding to a different recommended target negative pressure range. For instance, mild laxity corresponds to -20 kPa to -30 kPa, moderate laxity to -15 kPa to -25 kPa, and severe laxity to -10 kPa to -20 kPa. In actual operation, the user or operator can input or select the current user's skin laxity level through the device's user interface. After receiving this input, the main control unit 21 will query the database to obtain the recommended target negative pressure range matching the skin laxity level, and can automatically select a default value (e.g., the median) within that range as the final target negative pressure value, or prompt the user to select within that recommended range. Once the target negative pressure value is determined, the main control unit 21 will drive the air pressure regulating unit 22 to precisely adjust the pressure in the negative pressure chamber to the personalized target negative pressure value according to the aforementioned coarse and fine adjustment logic.

[0100] Through the aforementioned technical solution, the main control unit 21 can set the target negative pressure value required by the user based on different degrees of skin laxity, thereby solving the problem of lack of personalized adaptability in negative pressure therapy in traditional skin treatment institutions. This mechanism of adjusting the target negative pressure value according to individual skin conditions avoids situations such as excessive skin stretching, damage, or poor treatment results that may occur due to improper negative pressure settings. It ensures that the electrode unit works in the most suitable negative pressure environment, improving the comfort and safety of treatment, while significantly enhancing the effectiveness of treatment and user satisfaction, making the skin treatment process more precise and humanized.

[0101] 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 skin treatment mechanism characterized by, The skin treatment mechanism comprises a master control unit, an air pressure adjusting unit and an electrode unit, the air pressure adjusting unit and the electrode unit are electrically connected with the master control unit respectively, the electrode unit is attached to the skin to form a negative pressure cavity, and the negative pressure cavity is communicated with the air pressure adjusting unit and the electrode unit; The master control unit is used for: controlling the air pressure adjusting unit to coarsely adjust the air pressure value of the negative pressure cavity to a first air pressure value; comparing the first air pressure value with a target negative pressure value to determine a first air pressure difference value; when the first air pressure difference value is less than a preset threshold value, controlling the air pressure adjusting unit to finely adjust the negative pressure cavity from the first air pressure value to the target negative pressure value to control the electrode unit to work.

2. The skin treatment mechanism of claim 1, wherein The skin treatment mechanism further comprises a first pressure sensor communicated between the air pressure adjusting unit and the electrode unit, the first pressure sensor is electrically connected with the master control unit, and is used for detecting the air pressure value of the negative pressure cavity, the first air pressure value after coarse adjustment and the target negative pressure value after fine adjustment in real time.

3. The skin treatment mechanism of claim 2, wherein The air pressure adjusting unit comprises a solenoid valve, a proportional valve and a vacuum pump, the solenoid valve is connected with the negative pressure cavity, and the negative pressure cavity and the external environment are communicated with the solenoid valve respectively; the solenoid valve, the proportional valve and the vacuum pump are communicated with each other; the vacuum pump, the proportional valve and the solenoid valve are electrically connected with the master control unit respectively; and the first pressure sensor is communicated between the solenoid valve and the electrode unit. The master control unit is further used for controlling the vacuum pump to start and run at a first rotating speed; when the first air pressure difference value is less than the preset threshold value, controlling the vacuum pump to run at a second rotating speed and controlling the opening degree of the proportional valve for fine adjustment.

4. The skin treatment mechanism of claim 2, wherein The air pressure adjusting unit comprises a solenoid valve, a proportional valve and a vacuum pump, the solenoid valve is connected with the negative pressure cavity, and the negative pressure cavity and the external environment are communicated with the solenoid valve respectively; the solenoid valve is communicated with the vacuum pump, one end of the proportional valve is communicated between the solenoid valve and the vacuum pump, and the other end of the proportional valve is used for communicating with the external environment; the vacuum pump, the proportional valve and the solenoid valve are electrically connected with the master control unit respectively; and the first pressure sensor is communicated between the solenoid valve and the electrode unit. The master control unit is further used for controlling the vacuum pump to start and run at a first rotating speed; when the first air pressure difference value is less than the preset threshold value, controlling the vacuum pump to run at a second rotating speed and controlling the opening degree of the proportional valve for fine adjustment.

5. Skin treatment device according to claim 3 or 4, characterized in that The master control unit is specifically used for: in response to controlling the opening degree of the proportional valve for fine adjustment, adjusting the opening degree of the proportional valve according to a preset control mode; wherein the control mode is any one of the following: a continuous control mode: controlling the opening degree of the proportional valve to continuously change in a range greater than 0% to less than 100%; a four-order and above control mode: controlling the opening degree of the proportional valve to be adjusted to a first preset opening degree value, a second preset opening degree value, a third preset opening degree value, a fourth preset opening degree value and / or an Nth preset opening degree value in turn, wherein N is greater than four.

6. Skin treatment device according to claim 5, characterized in that The driving current of the proportional valve is continuously adjusted or adjusted at a plurality of preset current values in discrete manners in response to fine adjustment of the opening degree of the proportional valve.

7. Skin treatment device according to claim 3 or 4, characterized in that The skin treatment mechanism further comprises a second pressure sensor connected between the electromagnetic valve and the proportional valve, configured to detect the adjusted air pressure of the proportional valve; the second pressure sensor is electrically connected to the main control unit; The main control unit is further configured to acquire a second air pressure value detected by the second pressure sensor between the electromagnetic valve and the proportional valve. The main control unit is further configured to determine that there is a blockage or air leakage between the electromagnetic valve and the proportional valve when the first air pressure value and the second air pressure value are not equal, and to issue a prompt or an alarm.

8. The skin treatment mechanism of claim 3, wherein the skin treatment mechanism is configured to move the skin treatment element in a direction that is substantially parallel to the skin surface. The vacuum pump comprises a pump body and a brushless direct current motor connected to the pump body, the pump body is connected to the proportional valve, the brushless direct current motor is provided with a half-bridge drive circuit, and the half-bridge drive circuit is electrically connected to the main control unit. The main control unit is further configured to deliver a PWM signal to the half-bridge drive circuit to control the rotation speed of the brushless direct current motor and thus the air pumping capacity of the vacuum pump.

9. Skin treatment device according to claim 3 or 4, characterized in that The skin treatment mechanism further comprises a handle, a main machine, a first filter and a second filter, the handle is provided with a negative pressure pipeline, the negative pressure cavity is connected to the negative pressure pipeline; the first filter is arranged in the negative pressure cavity or in the negative pressure pipeline adjacent to the negative pressure cavity; the main machine further comprises a shell, the main control unit, the electromagnetic valve, the proportional valve and the vacuum pump are all installed in the shell, the shell is provided with an interface connected to the electromagnetic valve; and the second filter is installed at the interface.

10. The skin treatment mechanism of claim 1, wherein, The main control unit is further configured to set a target negative pressure value required by a user based on different skin relaxation degrees.

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