A skin treatment system and method based on synchronization of polarized light with biological rhythms

Abstract

The application discloses a skin treatment system and method based on polarization light and biological rhythm synchronization, which is composed of five modules of light source, polarization light generation, pulse control, temperature control and outer ring mask. The light source outputs near-infrared laser, and linearly polarized light with high polarization degree is formed through a polarizer. The pulse module collects heart rate through PPG, and realizes synchronization of laser pulse and heartbeat rhythm in three frequency division modes. The temperature control assembly realizes closed-loop temperature control. The mask frame is arranged in different wavelength laser, and the irradiation distance with the face is 10 cm. The application sets different wavelength, energy and pulse parameters for chloasma, sensitive skin and skin anti-aging, realizes anti-inflammation, inhibits melanin and induces collagen regeneration by relying on non-thermal light biological regulation. The application uses polarization light to improve light penetration efficiency, and uses heart rate synchronization to improve light energy utilization rate. The whole process is free of thermal damage, avoids the drawbacks of traditional photoelectric treatment such as redness and color deposition, targets and partitions treatment, and is non-invasive and safe.

Description

Technical Field

[0001] This invention relates to the field of medical aesthetics and skin treatment technology, and in particular to a skin treatment system and method based on the synchronization of polarized light with biological rhythms. Background Technology

[0002] Healthy and beautiful skin is an important part of modern people's quality of life. Melasma, skin sensitivity, and aging are common skin problems that trouble many people. Current treatment methods mainly include topical medications (such as hydroquinone and retinoic acid), chemical peels, and various phototherapy techniques.

[0003] Phototherapy techniques, particularly lasers and intense pulsed light (IPL), have been widely used in cosmetic dermatology. For example, Q-switched Nd:YAG lasers (1064nm), alexandrite lasers (755nm), ruby ​​lasers (694nm), or frequency-doubled Nd:YAG lasers (532nm) have been used to treat pigmented lesions such as freckles, melasma, nevus of Ota, and tattoos. The core of these technologies lies in photothermal and photoacoustic ablation effects. However, these highly explosive laser technologies often come with certain side effects, such as pain during treatment, post-treatment redness and swelling, long recovery periods, and even the potential to induce post-inflammatory hyperpigmentation (PIH), especially for patients with darker skin types (Fitzpatrick III-V) in East Asian and Chinese populations. Furthermore, most existing explosive photothermal technologies focus on generating "controlled damage" through high energy to stimulate repair. This "destruction followed by reconstruction" model is not ideal for users seeking gentle, non-invasive treatments with no recovery period.

[0004] In recent years, photobiomodulation (PBM), also known as low-level laser therapy (LLLT), has received increasing attention as a non-invasive, non-thermal treatment method. However, existing devices mostly use visible light wavelengths such as 590nm LED yellow light and 640nm LED red light, which have limited penetration depth and are difficult to reach deep skin tissues. Its core mechanism is to regulate intracellular biological processes through low-energy photons of specific wavelengths, rather than causing tissue damage through heat. Studies have shown that PBM can act on mitochondria, especially cytochrome C oxidase, thereby increasing ATP production, regulating reactive oxygen species (ROS) levels, activating multiple signaling pathways, and ultimately achieving anti-inflammatory effects and promoting tissue repair and regeneration. However, existing PBM devices still have limitations, such as insufficient standardization of technical parameters, a single treatment concept, and a lack of integration with the body's deep circadian rhythms. Therefore, there is an urgent need in this field for a skin treatment system that combines the safety and non-invasive advantages of PBM with efficient, deep, and intelligent treatment. Summary of the Invention

[0005] In order to address the problems of low energy utilization efficiency, insufficient parameter standardization, and simplistic treatment concepts in existing technologies, this invention provides a highly efficient, safe, and intelligent skin treatment system and its usage method that enhances penetration and synchronizes with biological rhythms through polarized light.

[0006] The present invention adopts the following technical solution: A skin treatment system based on the synchronization of polarized light and biological rhythms, comprising: The light source module consists of several semiconductor lasers that output one or more near-infrared laser wavelengths from 930nm, 980nm, and 1060-1064nm. Unlike the commonly used visible light bands such as 590nm LED yellow light and 640nm LED red light, this wavelength can effectively penetrate deep into the skin and be absorbed by photoreceptors in the mitochondria. A polarized light generation module is located in the light output path of the light source module, including a linear polarizer, which converts the incident laser into linearly polarized light with a polarization degree >90%. The pulse control module is electrically connected to the light source module, and has a built-in MCU main control unit and heart rate acquisition sensor. It collects human heart rate signals in real time and generates 0.2Hz to 2Hz pulse drive signals based on the measured heart rate or heart rate integer frequency division, so as to realize the synchronization of laser light output pulse with human heartbeat biorhythm. The temperature control module includes multiple temperature sensors and an active cooling device. The temperature sensors collect the skin surface temperature in real time, and the active cooling device keeps the surface temperature of the treatment area below 40°C through closed-loop feedback. The outer ring-type face mask irradiation mechanism includes a ring frame and connecting components connected to the ring frame. The laser array is fixed in sections inside the ring frame. When in use, the distance between the ring frame and the face is 10cm-15cm.

[0007] By employing the above technical solutions: the light source module outputs near-infrared laser light, which has a large penetration depth and can directly act on deep target tissues of the skin; the polarization light generation module converts the laser into highly polarized linearly polarized light, enhancing the tissue penetration ability and immunomodulatory effect of the light, and improving the efficiency of light energy utilization; the pulse control module creatively introduces a heart rate synchronization mechanism, enabling the laser pulse to resonate harmoniously with the body's internal biological rhythms, theoretically maximizing cellular biocompatibility and energy absorption efficiency, and improving treatment efficacy; the temperature control module uses closed-loop feedback active cooling to ensure that the entire treatment process is within a safe range of non-thermal effects, avoiding the risk of thermal damage; the outer ring mask irradiation mechanism adopts a non-contact design, providing a uniform and stable light field distribution, improving treatment comfort and safety. These modules work together to achieve safe, efficient, deep, and intelligent skin phototherapy.

[0008] Preferably, the semiconductor lasers inside the ring frame are arranged in a matrix-like, cross-uniform pattern, totaling 84 lasers with a total power of 4.2W. These include 24-36 lasers in the 1060-1064nm band, 18-24 lasers in the 930nm band, and 18-24 lasers in the 980nm band. The three wavelengths are mixed and interspersed to achieve uniform illumination of the entire face. Each laser is independently equipped with a miniature linear polarizer at its front end, resulting in a polarization degree of more than 90% for the emitted rays.

[0009] By employing the aforementioned technical solution—a cross-mixed arrangement of three wavelengths—it can simultaneously cover three target areas: pigment metabolism, barrier repair, and collagen regeneration, achieving multi-dimensional synergistic treatment across the entire face. Users can independently activate the laser array of the corresponding wavelength according to their own skin problems, flexibly combining treatment plans. Each laser is independently equipped with a polarizer at its front end, ensuring a high degree of polarization consistency in the emitted light, improving the uniformity and effectiveness of treatment across the entire face. In this structure, the uniform mixed layout across the entire face, the independent controllability of multiple wavelengths, and the independent polarization module work together to upgrade the phototherapy mode from "single-effect irradiation" to "multi-effect synergistic treatment across the entire face," significantly improving the universality and overall effectiveness of the treatment.

[0010] Preferably, the pulse control module includes a PPG heart rate signal acquisition unit, a signal amplification and filtering circuit, an STM32 microcontroller, a multi-channel constant current laser drive circuit, and a human-machine interaction unit. The PPG sensor in the PPG heart rate signal acquisition unit acquires pulse electrical signals, which are then sent to the STM32 microcontroller through the signal amplification and filtering circuit. The STM32 microcontroller outputs PWM modulation signals in three modes: 1:1 synchronization, 1 / 2 harmonic, and 1 / 3 harmonic. These signals are then used by the multi-channel constant current laser drive circuit to control the start and stop of the laser arrays in different zones.

[0011] By employing the above technical solution—using a high-sensitivity PPG sensor and a powerful MCU—real-time and accurate acquisition of heart rate signals is ensured, and three flexible synchronization modes (1:1, 1 / 2, and 1 / 3) are provided to adapt to different treatment needs and individual differences. The multi-channel constant-current laser drive circuit independently controls each zone, ensuring precise and controllable energy output in each area while maintaining biorhythm synchronization. In this structure, heart rate acquisition, signal processing, multi-mode pulse generation, and independent zone drive are combined to construct a closed-loop, high-precision, biocompatible control core, providing a reliable technical path for the innovative concept of "resonating with life."

[0012] Preferably, the temperature control module adopts hysteresis closed-loop control logic, the active cooling device is a miniature cooling fan or TEC semiconductor cooling chip, the temperature sensor is arranged in different zones inside the mask, the temperature measurement accuracy is ±0.1℃, the cooling is automatically started when the body surface temperature approaches the threshold of 39.5℃, the cooling stops when it drops to 38.0℃, and 40℃ is the absolute safety cut-off threshold.

[0013] By adopting the above technical solution, the active cooling device provides an efficient and flexible cooling method. Combined with high-precision sensors and hysteresis closed-loop feedback, a rapid-response and stable temperature-locking system is formed, strictly controlling the treatment temperature below 40℃. This ensures the safety and non-invasiveness of the entire treatment process, making it particularly suitable for people with sensitive skin and dark skin tones. In this structure, the synergy of multi-point temperature control, active cooling, and hysteresis closed-loop strategy is the core safety guarantee for realizing the concept of "non-thermal photobiological regulation," eliminating the risk of thermal damage from traditional photothermal therapy, while avoiding frequent start-ups and shutdowns of the cooling device, thus extending the equipment's lifespan.

[0014] Preferably, the laser is composed of an aluminum heat sink base, a laser diode chip, a collimating lens, a linear polarizer, and a protective glass assembled in sequence; the focal length of the collimating lens is 5mm, and the extinction ratio of the linear polarizer is >1000:1.

[0015] By adopting the above technical solutions: the aluminum base provides excellent heat dissipation, ensuring the stability and lifespan of the laser; the collimating lens ensures concentrated laser beam energy and good directionality; and the high extinction ratio polarizer ensures the high polarization characteristics of the emitted light, which is key to achieving enhanced penetration and immune modulation effects. The modular design of this component facilitates manufacturing and maintenance, and the coordinated operation of each subunit ensures high quality and high efficiency of the emitted light.

[0016] Preferably, the ring frame is made of medical-grade ABS material and is equipped with light-shielding accessories; when in use, the distance between the ring frame and the face is 10cm.

[0017] By adopting the above technical solutions: medical ABS material ensures the safety and durability of the equipment; light-shielding accessories protect the user's eyes; and a fixed distance of 10cm is the key to non-contact treatment, ensuring the uniformity and repeatability of the spot size and energy density, and improving the standardization and comfort of the treatment.

[0018] Preferably, the connecting assembly includes a movable support arm connected to one side of the ring frame and a base clamp connected to one end of the movable support arm.

[0019] By adopting the above technical solution—the combination of the movable support arm and the base clamp—the position and angle of the mask irradiation mechanism can be flexibly adjusted, adapting to users of different heights and sitting postures, thus enhancing the applicability and ease of use of the equipment.

[0020] A method of using the skin treatment system described above includes the following steps: S1. The user wears a light-blocking goggle, positions the ring frame in front of the face, and maintains a 10-15cm irradiation distance between the mask and the face; S2. Select the treatment wavelength, energy density, and heart rate synchronization pulse mode parameters according to the type of disease; S3. Start the equipment. The temperature control module provides real-time temperature control throughout the process. The system outputs polarized pulse laser with corresponding parameters for irradiation treatment. A single treatment course is set to 5-10 treatments, with 1-2 treatments per week.

[0021] By adopting the above technical solution, this method clarifies the entire process from preparation and parameter configuration to treatment execution, emphasizes the core steps of heart rate synchronization mode and whole-process hypothermia control, and ensures the standardization, safety and effectiveness of the treatment process.

[0022] As a preferred option, S2 also includes differentiated configuration of symptom parameters: Treatment for melasma: 980nm laser with an energy density of 0.7–1.1 J / cm² is used. 2 The pulse uses a 1:1 heart rate synchronization mode; Sensitive skin repair: 930nm laser with an energy density of 0.5–0.8 J / cm² is used. 2 The pulse selects the heart rate 1 / 2 frequency harmonic mode; Skin anti-aging and rejuvenation: 1060-1064nm laser with an energy density of 0.9-1.5J / cm² is used. 2 The pulse uses a 1:1 heart rate synchronization mode.

[0023] By adopting the above-mentioned technical solutions, specific and optimized parameter combinations are provided for different conditions, forming standardized clinical treatment plans that ensure the operability and expected results of the treatment. For example, for melasma, a 980nm wavelength with deep penetration and pigment inhibition function is used in combination with a strong synchronization mode; for sensitive skin, a 930nm wavelength with lower energy and stronger anti-inflammatory and repairing effects is selected in combination with a gentler 1 / 2 harmonic mode; for anti-aging, a 1064nm wavelength with the deepest penetration and strongest collagen regeneration promotion ability is selected in combination with a strong synchronization mode. This differentiated parameter configuration is the key intelligent manifestation of this system's goal of achieving "multi-effect combined" treatment.

[0024] As a preferred option, the skin surface temperature is controlled to be below 40°C throughout the treatment process by a temperature control module, relying on non-thermal photobiological regulation to achieve anti-inflammatory effects, inhibit abnormal melanin, and promote collagen regeneration.

[0025] By adopting the above technical solution, the non-thermal effect of the treatment process of the present invention is clarified, that is, the therapeutic effect is achieved through photobiological regulation rather than thermal damage. This fundamentally ensures the safety of the treatment and avoids the side effects of pain, redness, swelling and PIH of traditional phototherapy.

[0026] Compared with the prior art, the present invention has the following advantages: 1. Pioneering Synergistic Mechanism of Polarized Light Synchronization with Biological Rhythms. Based on photobiological modulation (PBM) technology, this invention innovatively combines highly polarized linearly polarized light (polarization degree > 90%) with a real-time heart rate synchronization pulse mode. On the one hand, polarized light significantly enhances the penetration depth and immunomodulatory effect of near-infrared laser in skin tissue, improving light energy utilization efficiency. On the other hand, by collecting heart rate in real time through a PPG sensor and generating three pulse modes—1:1 synchronization, 1 / 2 harmonic, and 1 / 3 harmonic—the laser emission rhythm and the human heartbeat biological rhythm achieve dynamic resonance, thereby maximizing the absorption and utilization of light energy by cellular mitochondria and breaking through the technical bottleneck of low energy matching efficiency in traditional fixed-frequency phototherapy equipment.

[0027] 2. Closed-loop, non-thermal temperature control throughout the entire process completely eliminates the risk of thermal damage. Existing phototherapy methods (such as Q-switched lasers and intense pulsed light) often rely on photothermal effects or photoacoustic ablation, which can easily lead to side effects such as pain during treatment, postoperative redness and swelling, and post-inflammatory hyperpigmentation (PIH), especially for people with darker skin tones. This invention uses a closed-loop feedback system composed of multiple high-precision temperature sensors (accuracy ±0.1℃) and an active cooling device (micro-fan or TEC semiconductor cooling chip) to strictly control the surface temperature of the treatment area below 40℃, ensuring that the treatment relies entirely on non-thermal photobiological regulation (anti-inflammatory, inhibition of abnormal melanin, and promotion of collagen regeneration), achieving safe treatment that is non-invasive, painless, and requires no recovery period.

[0028] 3. Multi-wavelength cross-uniform hybrid array for comprehensive, multi-effect synergistic treatment of the entire face. Existing phototherapy devices mostly use single-wavelength or fixed-wavelength modes in different areas, making it difficult to simultaneously address multiple skin problems across the face. This invention arranges 84 semiconductor lasers in a cross-uniform pattern inside a ring-shaped mask, fusing three wavelengths: 1060–1064nm (anti-aging and collagen promotion), 930nm (anti-inflammatory and barrier repair), and 980nm (spot reduction and pigmentation inhibition). Each laser is independently equipped with a miniature linear polarizer at its front end. This structure enables precise single-wavelength treatment or multi-wavelength combined treatment, simultaneously covering all areas of the face. It can simultaneously meet multiple treatment needs such as melasma, sensitive skin, and skin anti-aging, significantly improving the overall treatment benefits and applicability.

[0029] 4. Non-contact, constant-distance irradiation enhances treatment standardization and comfort. Traditional close-fitting masks can cause pressure and claustrophobia, and the inconsistent irradiation distance leads to poor energy density repeatability. This invention employs an outer ring mask irradiation mechanism, which uses movable support arms and base clamps to maintain a non-contact, fixed distance of 10-15cm between the ring frame and the face. Combined with medical-grade ABS material and light-shielding accessories, this ensures uniformity and repeatability of spot size and energy density while eliminating facial pressure, thus improving user compliance and treatment comfort.

[0030] 5. Providing standardized and differentiated clinical treatment plans. This invention offers specific optimized parameter combinations for three common skin conditions: for melasma treatment, a 980nm laser with an energy density of 0.7–1.1 J / cm² is used. 2 Heart rate 1:1 synchronization mode; sensitive skin repair uses 930nm laser with an energy density of 0.5–0.8 J / cm². 2 Heart rate 1 / 2 harmonic mode; skin anti-aging uses 1060-1064nm laser with energy density of 0.9-1.5J / cm². 2 Heart rate 1:1 synchronization mode. These standardized "wavelength-energy-rhythm" parameter configurations not only reduce operational complexity but also ensure the safety and effectiveness of treatment, providing a reliable basis for clinical application. Attached Figure Description

[0031] Figure 1 This is a three-dimensional perspective view of the overall appearance of the outer ring-shaped mask.

[0032] Figure 2 This is a diagram showing the distribution of the laser array on the mask.

[0033] Figure 3 This is a sectional view of the side of the mask.

[0034] Figure 4 for Figure 3 A magnified view of part A.

[0035] Figure 5 This is a block diagram of the pulse control circuit.

[0036] Figure 6 This is a timing diagram for heartbeat synchronization.

[0037] Figure 7 This is an exploded view of the laser unit module.

[0038] In the diagram, the components are: light source module 1, semiconductor laser 1-1, laser diode chip 1-1-1, collimating lens 1-1-2, aluminum heat dissipation base 1-1-3, protective glass 1-1-4, polarized light generation module 2, linear polarizer 2-1, pulse control module 3, PPG heart rate signal acquisition unit 3-1, signal amplification and filtering circuit 3-2, STM32 microcontroller 3-3, constant current laser drive circuit 3-4, human-machine interaction unit 3-5, temperature control module 4, temperature sensor 4-1, active cooling device 4-2, outer ring mask irradiation mechanism 5, ring frame 5-1, movable support arm 5-2, and base clamp 5-3. Detailed Implementation

[0039] To facilitate understanding of the technical solution of the present invention, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0040] like Figures 1-7 The skin treatment system shown is based on the synchronization of polarized light and biological rhythms, and includes a light source module 1, a polarized light generation module 2, a pulse control module 3, a temperature control module 4, and an outer ring mask irradiation mechanism 5.

[0041] The light source module 1 consists of several semiconductor lasers 1-1, outputting near-infrared lasers of one or more wavelengths from 930nm, 980nm, and 1060-1064nm. Unlike the commonly used 590nm LED yellow light and 640nm LED red light in the visible light band, this wavelength can effectively penetrate deep into the skin and be absorbed by photoreceptors in the mitochondria, exerting a deep biological regulatory effect. The polarized light generation module 2, located in the output optical path of the light source module 1, includes a linear polarizer 2-1, converting the incident laser into linearly polarized light with a polarization degree >90%. The pulse control module 3, electrically connected to the light source module 1, incorporates an MCU main control unit and a heart rate sensor. It collects human heart rate signals in real time and generates 0.2Hz-2Hz pulse drive signals based on the measured heart rate or integer frequency division of the heart rate, achieving synchronization between the laser output pulse and the human heartbeat's biological rhythm. The temperature control module 4 includes multiple temperature sensors 4-1 and an active cooling device 4-2. The temperature sensors 4-1 collect the skin surface temperature in real time, and the active cooling device 4-2 provides closed-loop feedback to keep the surface temperature of the treatment area below 40°C. The outer ring mask irradiation mechanism 5 includes a ring frame 5-1 and connecting components attached to the ring frame 5-1. The laser array 1-1 is fixed in sections inside the ring frame 5-1, and the distance between the ring frame 5-1 and the face is 10cm-15cm during use. In this structure, the specific near-infrared light output by the light source module 1 has strong penetrating power, laying the foundation for deep treatment; the polarized light generation module 2 further enhances the light's penetrability and immunomodulatory capabilities, compensating for the shortcomings of ordinary lasers or LEDs in biological effects; the pulse control module 3 introduces the concept of heart rate synchronization, breaking away from the limitations of traditional fixed frequencies, aiming to create "resonance" with the living organism and improve biological response efficiency; the temperature control module 4 ensures the safety of the entire treatment process, providing a guarantee for non-thermal photobiological modulation; and the outer ring mask irradiation mechanism 5 provides a stable, uniform, and comfortable treatment platform. These five modules collaborate and innovate across five dimensions: energy, optics, biorhythm, thermodynamics, and ergonomics, to jointly construct a new system that surpasses existing phototherapy devices and offers greater biocompatibility and treatment precision. For example, in some embodiments, the sensor of the PPG heart rate signal acquisition unit 3-1 can be placed on a mask support or worn via a wristband for convenient real-time acquisition of the user's heart rate; the active cooling device 4-2 can be a miniature silent fan, a TEC semiconductor cooling chip, etc., configured according to cost and heat dissipation requirements.

[0042] like Figure 2 As shown, the semiconductor lasers 1-1 inside the ring frame 5-1 are arranged in a matrix-like, cross-uniform pattern, totaling 84 lasers with a total power of 4.2W. These include 24-36 1060nm lasers, 18-24 930nm lasers, and 18-24 980nm lasers. This mixed and staggered distribution of the three wavelengths achieves uniform irradiation across the entire face. Each laser 1-1 is independently equipped with a miniature linear polarizer 2-1 at its front end, resulting in a polarization degree of over 90% for the emitted light. In this structure, the mixed and staggered arrangement of the three wavelengths allows simultaneous action on different target points on the entire face: the 1060nm laser penetrates deeply, primarily targeting deep anti-aging and collagen regeneration; the 930nm laser has strong anti-inflammatory properties, primarily targeting the repair of the skin barrier in sensitive skin; and the 980nm laser specifically inhibits pigment metabolism, primarily targeting fading spots and brightening the complexion. Through independent wavelength control channels, users can choose single-wavelength targeted treatment or activate a multi-wavelength combined mode for comprehensive treatment of the entire face, significantly improving the applicability and treatment efficiency of the device. Meanwhile, each laser is independently equipped with a polarizer, ensuring the uniformity of the emitted polarized light and further enhancing the uniformity of the full-face treatment. For example, in some embodiments, the output power of different wavelengths can be adjusted according to the severity of skin problems, and the number of corresponding wavelength lasers can be increased or decreased to adapt to different product models.

[0043] In this embodiment, the illumination distance is fixedly adjusted within the range of 10–15 cm. A collimating lens 1–1–2 is configured at the front end of a single semiconductor laser 1–1, with a designed divergence angle of 15°. According to geometric optics calculations, the diameter of the light spot formed by a single laser at an illumination distance of 10 cm is: D=2×d×tan(θ / 2)=2×10cm×tan(7.5°)≈2.63cm; The spot area corresponding to a single laser is approximately 5.43 cm². 2 .

[0044] To achieve uniform energy coverage of the facial area, the laser spots of adjacent lasers are set with an overlap rate of about 30% on the skin surface, and the array of 84 lasers can completely cover the treatment area of ​​an adult face.

[0045] In terms of energy parameter design, the total system power is 4.2W, and the average rated output power of a single laser is 50mW. The energy density of photobiological modulation therapy is determined by the peak power of a single pulse, the pulse width, the total number of treatment pulses, and the spot area, calculated using the following formula: Energy density (J / cm) 2 = (peak power of a single pulse × width of a single pulse × total number of pulses) / area of ​​a single spot.

[0046] This system employs a millisecond-level pulse width design, with the pulse width determined by the real-time heart rate cycle and a preset duty cycle. Taking a resting heart rate of 60 bpm as an example, the pulse cycle is 2 seconds in 1 / 2 harmonic mode, 3 seconds in 1 / 3 harmonic mode, and 4 seconds in 1 / 4 harmonic mode, corresponding to equivalent heart rhythms of 30 bpm, 20 bpm, and 15 bpm respectively. Different frequency division modes can be selected according to the required treatment temperature. For example, in 1:1 synchronization mode with a 30% duty cycle, the single pulse width is 300 ms.

[0047] Taking the treatment parameters for melasma as an example, the target energy density is 0.7–1.1 J / cm². 2 The treatment lasted 20 minutes (1200 seconds), corresponding to a total of 1200 pulses. The calculated effect was 0.9 J / cm². 2 The target energy density requires only a single-pulse peak power of about 13.5mW, which is far lower than the laser's rated power of 50mW. The system can precisely control the output power by adjusting the drive current to ensure accurate and controllable energy density.

[0048] The pulse control module 3 includes a PPG heart rate signal acquisition unit 3-1, a signal amplification and filtering circuit 3-2, an STM32 microcontroller 3-3, a multi-channel constant current laser drive circuit 3-4, and a human-machine interaction unit 3-5. The PPG sensor in the PPG heart rate signal acquisition unit 3-1 acquires pulse electrical signals, which are then sent to the STM32 microcontroller 3-3 via the signal amplification and filtering circuit 3-2. The STM32 microcontroller 3-3 outputs PWM modulation signals in three modes: 1:1 synchronization, 1 / 2 harmonic, and 1 / 3 harmonic. These signals are then used by the multi-channel constant current laser drive circuit 3-4 to control the start and stop of the laser array 1-1 in different zones. In this structure, the entire process forms an intelligent closed loop: the PPG sensor acquires heart rate in real time → the MCU analyzes the data and generates pulse signals synchronized with the heart rhythm → the constant current drive circuit precisely controls the laser array to operate according to these pulses. This design completely abandons the fixed, mechanical pulse patterns of traditional phototherapy equipment, instead adopting a method of dynamic synchronization with the user's own vital rhythm (heart rate). For example, when a user's heart rate changes due to exercise or emotional fluctuations, the laser pulse frequency will adjust accordingly. Theoretically, this dynamic resonance regulation method can perfectly match the absorption and utilization of light energy with the rhythm of cell metabolism (such as ATP supply and consumption), thereby greatly improving the efficiency and effect of photobiological regulation. This is the core inventive point of this invention.

[0049] The pulse control module 3 employs a signal mapping algorithm of "systolic peak triggering + fixed duty cycle" to achieve precise synchronization between the pulse and the heartbeat rhythm. 1. Signal Acquisition and Feature Extraction: The PPG heart rate signal acquisition unit 3-1 acquires the pulse wave signal in real time. The STM32 microcontroller 3-3 identifies the systolic peak of the PPG signal through a differential algorithm, which corresponds to the ejection start point of the cardiac cycle.

[0050] 2. Pulse triggering logic: For each peak detected, the microcontroller delays for 50ms (aligning with the peak blood flow moment of the actual heart ejection) before triggering a laser pulse; the pulse width is set to a fixed percentage of the current heartbeat cycle, and the duty cycle ranges from 20% to 40%, which can be configured according to treatment needs.

[0051] The pulse output supports multiple integer frequency division modes, enabling pulse output with different cycles such as 2 seconds, 3 seconds, and 4 seconds, corresponding to equivalent rhythms of 30 bpm, 20 bpm, and 15 bpm respectively. The frequency coverage range is 0.2 Hz to 2 Hz, adapting to different intensity treatment needs.

[0052] To address dynamic changes in heart rate and avoid flickering and a degraded user experience caused by sudden pulse frequency changes, the system incorporates a smooth transition mechanism between sliding window averaging and a software phase-locked loop (PLL): Sliding window averaging: The microcontroller calculates the moving average of the past 5 heartbeat cycles as the current reference cycle, without relying on data from a single cycle, thus avoiding pulse jumps caused by occasional heart rhythm fluctuations.

[0053] Smooth rate limiting: When a change in heart rate is detected, the pulse cycle gradually approaches the new average cycle at a rate of up to 5% / second, achieving a smooth transition in frequency.

[0054] Phase-locked fault tolerance: The built-in software phase-locked loop algorithm ensures that when the PPG signal is briefly lost due to user actions, the system relies on the internal oscillator to maintain a stable pulse output; after the signal is recovered, the phase is automatically relocked to ensure the continuity and stability of the treatment process.

[0055] The active cooling device 4-2 is a miniature cooling fan or a TEC semiconductor cooling chip. Temperature sensors 4-1 are arranged in different sections inside the mask, with a temperature measurement accuracy of ±0.1℃. Cooling is automatically activated when the body surface temperature approaches the 39.5℃ threshold. The laser 1-1 is composed of an aluminum heat sink base 1-1-3, a laser diode chip 1-1-1, a collimating lens 1-1-2, a linear polarizer 2-1, and a protective glass 1-1-4 assembled sequentially. The collimating lens 1-1-2 has a focal length of 5mm, and the extinction ratio of the linear polarizer 2-1 is >1000:1. In this structure, the combination of a high-precision temperature control system and high-quality optical components is key to achieving non-thermal PBM: on the one hand, active cooling ensures that even with continuous laser operation, the skin surface temperature is strictly locked below 40°C, completely eliminating the risk of thermal damage—a fundamental difference from all traditional "thermal" phototherapy; on the other hand, the combination of a collimating lens and a high extinction ratio polarizer guarantees the energy concentration and high polarization characteristics of the emitted laser, which is the physical basis for polarized light to achieve enhanced penetration and immunomodulatory effects. The combination of these two elements allows the system to safely and efficiently deliver "effective energy" deep into the skin, achieving a truly "gentle yet powerful" therapeutic effect.

[0056] Temperature control module 4 employs closed-loop control logic with a hysteresis comparator to prevent the cooling device from frequently starting and stopping near the threshold. The specific control parameters and process are as follows: The absolute safety threshold is set at 40.0℃. When the temperature exceeds this value, the laser power supply will be cut off immediately to ensure treatment safety. The upper limit threshold for cooling start is set at 39.5℃, the lower limit threshold for cooling stop is set at 38.0℃, and the hysteresis interval is 1.5℃.

[0057] The control workflow is as follows: Initial stage: When treatment is initiated, the skin surface temperature is approximately 32°C, and the cooling device remains off; Heating phase: During the temperature rise, the cooling device remains off as long as the temperature is below 39.5℃; Cooling activation: When the temperature rises to ≥39.5℃, the microcontroller outputs a control signal to activate the active cooling device; Cooling maintenance: After the cooling device is started, the temperature gradually decreases. The cooling device remains in operation until the temperature drops to 38.0℃. Stop cooling: When the temperature continues to drop to ≤38.0℃, the microcontroller outputs a signal to shut down the cooling device; Cyclic regulation: After the temperature rises again during the treatment process, the above process is repeated to form a stable closed-loop temperature control.

[0058] The 1.5℃ hysteresis design ensures that the skin temperature is strictly controlled below the 40℃ safety line, effectively avoids frequent start-stop of the cooling device, extends the service life of the equipment, reduces operating noise, and improves the patient's treatment experience.

[0059] The ring frame 5-1 is made of medical-grade ABS material and is equipped with light-shielding accessories. During use, the distance between the ring frame 5-1 and the face can be adjusted and fixed within a range of 10-15cm. The connecting components include a movable support arm 5-2 connected to one side of the ring frame 5-1 and a base clamp 5-3 connected to one end of the movable support arm 5-2. In this structure, the non-contact outer ring design not only eliminates the pressure and claustrophobia associated with traditional face masks, but also allows for flexible adjustment of position and angle via the movable support arm 5-2 and the base clamp 5-3, ensuring a constant illumination distance. This guarantees the repeatability and uniformity of treatment energy, improving user experience and the standardization of treatment.

[0060] A method of using the skin treatment system described above includes the following steps: S1. The user wears a light-blocking goggle and positions the ring frame 5-1 in front of the face, maintaining a 10-15cm irradiation distance between the mask and the face; S2. Select the treatment wavelength, energy density, and heart rate synchronization pulse mode parameters according to the type of disease; S3. Start the equipment. Temperature control module 4 provides real-time temperature control throughout the process. The system outputs polarized pulse laser with corresponding parameters for irradiation treatment. A single treatment course is set to 5-10 treatments, with 1-2 treatments per week.

[0061] This method simplifies complex physical therapy into a three-step standardized procedure, making it easy for users to master and execute. As a precision treatment approach, S2 also includes differentiated configuration of symptom parameters: Treatment for melasma: 980nm laser with an energy density of 0.7–1.1 J / cm² is used. 2 The pulse uses a 1:1 heart rate synchronization mode; Sensitive skin repair: 930nm laser with an energy density of 0.5–0.8 J / cm² is used. 2 The pulse selects the heart rate 1 / 2 frequency harmonic mode; Skin anti-aging and rejuvenation: 1060nm laser is used, with an energy density of 0.9–1.5 J / cm². 2 The pulse uses a 1:1 heart rate synchronization mode.

[0062] By configuring differentiated parameters, this invention deeply binds the core synergistic mechanism to the pathological characteristics of different diseases. For example, for the complex causes of melasma, a deep-penetrating 980nm pulse combined with a strong synchronous pulse is used to both inhibit melanocyte activity and improve microcirculation and inflammation through resonance. For the fragile barrier of sensitive skin, a lower-energy 930nm pulse combined with a "half-harmonic" pulse (i.e., one pulse every two heartbeats) is used. This "gentler, lower-frequency" energy supply method greatly reduces the risk of irritation to sensitive skin, while the powerful immunomodulatory effect of polarized light begins to rebuild the skin barrier. For anti-aging, the deepest-penetrating and highest-energy 1064nm pulse is used, driven by the strongest synchronous mode to maximize energy transfer and cellular ATP production (mitochondrial "breathing" resonates synchronously with the heartbeat rhythm), powerfully activating fibroblasts and achieving deep collagen remodeling.

[0063] To ensure absolute safety during treatment, the skin surface temperature is controlled below 40°C throughout the entire treatment process by temperature control module 4. Anti-inflammatory effects, inhibition of abnormal melanin production, and promotion of collagen regeneration are achieved through non-thermal photobiological regulation. This reiterates the core safety baseline and treatment mode (non-thermal PBM) of this invention.

[0064] Referring to the accompanying drawings, the working principle of this invention is as follows: After system startup, the PPG heart rate signal acquisition unit 3-1 captures the user's heart rate in real time. The pulse control module 3, based on preset synchronization modes (1:1, 1 / 2, 1 / 3), generates a PWM pulse signal precisely synchronized with the heart rhythm using a peak-triggered algorithm. A sliding window and phase-locked loop mechanism ensure smooth and stable frequency output, with the pulse output frequency covering 0.2Hz to 2Hz to match different rhythm requirements. The three laser arrays in the light source module 1, receiving their respective independent control signals, emit near-infrared lasers of specific wavelengths (930nm / 980nm / 1060~1064nm) in pulse form. After emission, the laser light is first collimated by the collimating lens 1-1-2, and then converted into highly polarized linearly polarized light by a high extinction ratio linear polarizer 2-1. This polarized light is uniformly irradiated onto the user's facial skin in a non-contact, fixed-distance (adjustable 10~15cm) manner, with a 30% overlap design to achieve uniform coverage of the entire face. Under the influence of light, polarized light, due to its stronger penetrating power, penetrates deep into the dermis and is absorbed by photoreceptors in mitochondria (such as cytochrome C oxidase). This promotes ATP production and regulates cell signaling pathways through photobiological regulation. Simultaneously, because the laser pulses are synchronized with the heart rhythm, theoretically, optimal coupling resonance between external energy supply and internal cellular energy metabolism (ATP cycle) is achieved. Temperature control module 4 monitors skin temperature throughout the treatment using hysteresis logic. Cooling is initiated when the temperature approaches 39.5°C, stops when it reaches 38°C, and immediately shuts off when it exceeds 40°C, ensuring the entire treatment process is conducted within a safe and comfortable non-thermal effect zone. Therefore, the core objective of this invention is to organically integrate three innovative technologies—"polarized light enhanced penetration," "heart rate synchronized with biological rhythm," and "closed-loop non-thermal temperature control"—to construct a novel, highly efficient, safe, and intelligent skin photobiological regulation system based on the core concepts of "nourishment" and "harmony," thereby completely resolving the pain points of existing phototherapy technologies in terms of energy efficiency, treatment safety, and biocompatibility.

[0065] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention shall be determined by the scope defined in the claims. Any improvements and modifications made by those skilled in the art without departing from the spirit and scope of the present invention shall also be considered as within the scope of protection of the present invention.

Claims

1. A skin treatment system based on the synchronization of polarized light and biological rhythms, characterized in that, Include: The light source module (1) is composed of several semiconductor lasers (1-1) and outputs one or more near-infrared laser wavelengths of 930nm, 980nm, and 1060-1064nm. The polarization light generation module (2) is located in the light output path of the light source module (1) and includes a linear polarizer (2-1) to convert the incident laser into linearly polarized light with a polarization degree >90%. The pulse control module (3) is electrically connected to the light source module (1), and has a built-in MCU main control unit and heart rate acquisition sensor. It collects human heart rate signals in real time and generates 0.2Hz~2Hz pulse drive signals based on the measured heart rate or heart rate integer frequency division, so as to realize the synchronization of laser light output pulse with human heartbeat biological rhythm. The temperature control module (4) includes multiple temperature sensors (4-1) and an active cooling device (4-2). The temperature sensors (4-1) collect the skin surface temperature in real time and use the closed-loop feedback of the active cooling device (4-2) to keep the surface temperature of the treatment area below 40°C. The outer ring type mask irradiation mechanism (5) includes a ring frame (5-1) and a connecting component connected to the ring frame (5-1). The laser (1-1) array is fixed in a partition on the inner side of the ring frame (5-1). When in use, the distance between the ring frame (5-1) and the face is 10cm-15cm.

2. The skin treatment system according to claim 1, characterized in that, The semiconductor lasers (1-1) inside the ring frame (5-1) are arranged in a matrix-like, cross-uniform pattern, totaling 84 lasers with a total power of 4.2W. Among them are 24-36 lasers in the 1060-1064nm band, 18-24 lasers in the 930nm band, and 18-24 lasers in the 980nm band. The three wavelength lasers are mixed and interspersed to achieve uniform illumination of the entire face. Each laser is independently equipped with a miniature linear polarizer at its front end, and the polarization degree of the emitted beam is greater than 90%.

3. The skin treatment system according to claim 2, characterized in that, The pulse control module (3) includes a PPG heart rate signal acquisition unit (3-1), a signal amplification and filtering circuit (3-2), an STM32 microcontroller (3-3), a multi-channel constant current laser drive circuit (3-4), and a human-machine interaction unit (3-5). The PPG sensor of the PPG heart rate signal acquisition unit (3-1) acquires the pulse electrical signal and sends it to the STM32 microcontroller (3-3) through the signal amplification and filtering circuit (3-2). The STM32 microcontroller (3-3) outputs PWM modulation signals in three modes: 1:1 synchronization, 1 / 2 harmonic, and 1 / 3 harmonic. The multi-channel constant current laser drive circuit (3-4) controls the start and stop of the laser array (1-1) of different wavelengths respectively. The STM32 microcontroller (3-3) adopts a signal mapping algorithm with contraction peak triggering and fixed duty cycle: the contraction peak of the PPG signal is identified by the differential algorithm, and a laser pulse is triggered after a 50ms delay for each detected peak. The pulse width is set to 20% to 40% of the current heartbeat cycle. The pulse control module (3) has a built-in dynamic heart rate tracking and fault tolerance mechanism: the moving average of the past 5 heart rate cycles is used as the reference cycle. When a change in heart rate is detected, the pulse cycle smoothly approaches the new reference cycle at a maximum rate of 5% / second. At the same time, the built-in software phase-locked loop algorithm is used. When the PPG signal is briefly lost, the internal oscillator is used to maintain a stable pulse output. After the signal is recovered, the phase is automatically relocked.

4. The skin treatment system according to claim 2, characterized in that, The active cooling device (4-2) is a miniature cooling fan or a TEC semiconductor cooling chip. Temperature sensors (4-1) are arranged in different sections inside the mask, with a temperature measurement accuracy of ±0.1℃. When the body surface temperature approaches the threshold of 39.5℃, the cooling device automatically starts to lower the temperature. The temperature control module (4) adopts hysteresis closed-loop control logic: 40.0℃ is set as the absolute safety threshold, and the laser power supply is immediately cut off when the temperature exceeds the threshold; 39.5℃ is set as the upper limit threshold for cooling start, 38.0℃ is set as the lower limit threshold for cooling stop, and the hysteresis control range is 1.5℃.

5. The skin treatment system according to claim 1, characterized in that, The laser (1-1) is composed of an aluminum heat sink base (1-1-3), a laser diode chip (1-1-1), a collimating lens (1-1-2), a linear polarizer (2-1), and a protective glass (1-1-4) assembled in sequence; the collimating lens (1-1-2) has a focal length of 5mm, and the extinction ratio of the linear polarizer (2-1) is >1000:

1.

6. The skin treatment system according to claim 1, characterized in that, The ring frame (5-1) is made of medical ABS material and is equipped with light-shielding accessories; when in use, the distance between the ring frame (5-1) and the face is 10cm.

7. The skin treatment system according to claim 1, characterized in that, The connecting assembly includes a movable support arm (5-2) connected to one side of the ring frame (5-1) and a base clamp (5-3) connected to one end of the movable support arm (5-2).

8. A method of using the skin treatment system according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1. The user wears a light-blocking goggle and positions the ring frame (5-1) in front of the face, maintaining a 10-15cm irradiation distance between the mask and the face; S2. Select the treatment wavelength, energy density, and heart rate synchronization pulse mode parameters according to the type of disease; S3. Start the equipment. The temperature control module (4) controls the temperature in real time throughout the process. The system outputs polarized pulse laser with corresponding parameters for irradiation treatment. A single course of treatment is set to 5 to 10 treatments, and treatment is performed 1 to 2 times per week.

9. The method of use according to claim 8, characterized in that, S2 also includes differentiated configuration of symptom parameters: Treatment for melasma: 980nm laser with an energy density of 0.7–1.1 J / cm² is used. 2 The pulse uses a 1:1 heart rate synchronization mode; Sensitive skin repair: 930nm laser with an energy density of 0.5–0.8 J / cm² is used. 2 The pulse selects the heart rate 1 / 2 frequency harmonic mode; Skin anti-aging and rejuvenation: 1060-1064nm laser with an energy density of 0.9-1.5J / cm² is used. 2 The pulse uses a 1:1 heart rate synchronization mode.

10. The skin treatment method according to claim 8, characterized in that, Throughout the treatment, the skin surface temperature is controlled by the temperature control module (4) to be below 40°C, and anti-inflammatory, inhibition of abnormal melanin and collagen regeneration are achieved by relying on non-thermal photobiological regulation.

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