Laser irradiation physiotherapy instrument based on metal film directional scattering beam expansion

Abstract

This invention discloses a laser irradiation therapy device based on metal film directional scattering beam expansion, comprising a chassis, a power supply module, an intelligent control module, a mid-infrared laser emission module, and a human-computer interaction component mounted on the chassis. It also includes a laser transmission module, a metal film directional scattering beam expansion and homogenization module, a visible laser emission module, a temperature detection module, and an adjustable support. During operation, the mid-infrared laser is transmitted to the beam-combining module via a light guide arm or flexible mid-infrared hollow fiber, while the visible laser is transmitted to the beam-combining lens via a visible light incident channel. The two lasers form a coaxial composite beam at the beam-combining lens, which together irradiates the metal film component. After directional scattering and beam expansion, the beam is output from the light outlet to the working area, forming an expanded and homogenized light spot. This therapy device, with the metal film component as the core optical shaping component, has advantages such as clear structure, adjustable light output direction, adjustable light spot area, visualized working area, and high safety.

Description

Technical Field

[0001] This invention relates to the field of laser physiotherapy equipment technology, and in particular to a laser irradiation physiotherapy device based on metal film directional scattering beam expansion. Background Technology

[0002] Lasers possess advantages such as good directionality, high energy density in interaction with matter, and strong thermal and photochemical effects when interacting with specific biological tissues. They have significant application value in promoting local blood circulation, relieving pain, improving local metabolism, reducing inflammation, and promoting tissue repair. Therefore, they have broad application prospects in laser internal and surgical procedures and irradiation therapy. For example, mid-infrared lasers, represented by CO2 lasers, have a center wavelength of 9.6~10.6 μm, which is very close to the center wavelength of human infrared radiation. After absorption by human skin and tissues, they can cause microvascular dilation through resonant thermal reactions, promoting local blood circulation. They have certain application value in wound treatment, tissue repair assistance, and thermotherapy. Furthermore, visible lasers, represented by 660 nm red lasers, have a more defined irradiation area and better output controllability. They mainly act on the superficial and dermal layers of the skin, and their shorter wavelength results in more pronounced scattering effects. They have certain application value in irradiation therapy, superficial tissue therapy, and assisted wound repair.

[0003] However, the laser spot itself is very small, with concentrated local energy. When used in human irradiation rehabilitation therapy, low-cost beam expansion is a pressing technical problem that needs to be solved in this field. Existing technologies mostly use lens combinations or defocused lasers, which are costly, have limited beam expansion size and uneven energy, and high structural rigidity. They are only suitable for laser acupoint moxibustion with small spot sizes and are difficult to apply to rehabilitation therapy for large surgical wounds, joint rehabilitation therapy after exercise, lumbar muscle strain, and other similar situations.

[0004] To address the aforementioned technical challenges, it is necessary to provide a laser irradiation therapy device based on metal film directional scattering beam expansion. Replacing traditional beam expander combinations with metal film directional scattering beam expansion enables low-cost beam expansion for various lasers. Furthermore, through the integrated design of the therapy device's light source module, transmission module, beam combining and directional scattering beam expansion module, and intelligent control module, advantages such as flexible laser transmission, adjustable beam expansion area, and controllable energy density can be achieved. This provides a cost-effective solution for beam expansion and homogenization therapy for various lasers. Summary of the Invention

[0005] To address the problems of high beam expansion costs, limited beam spot area, uneven energy distribution, and insufficient operational flexibility at the output end in existing laser therapy devices for large-area irradiation applications, the present invention aims to provide a laser irradiation therapy device based on metal film directional scattering beam expansion. This device uses a metal film assembly as the beam shaping component, employs a light guide arm or flexible optical fiber for mid-infrared laser transmission, utilizes the metal film assembly to achieve beam expansion and homogenization, combines visible light beam combining to achieve beam spot visualization, and integrates an intelligent control module to achieve intelligent preset of operating parameters and safe monitoring of the process. This constructs a therapy platform with adjustable beam spot size, uniform energy distribution, flexible operation, and high safety and reliability. It effectively overcomes the limitations of existing devices using traditional complex beam expander combinations or defocused beam expanders for therapy, such as high cost, limited beam spot size and uneven energy distribution, high structural rigidity, and suitability only for small-spot laser acupoint moxibustion.

[0006] The specific technical solution for achieving the objective of this invention is as follows: A laser irradiation therapy device based on metal film directional scattering beam expansion includes a chassis, a laser transmission module, a metal film directional scattering beam expansion homogenization and visible light beam combining module, a visible laser emission module, a temperature detection module, and an adjustable support. The chassis houses a power supply module, an intelligent control module, and a mid-infrared laser emission module, and includes a human-machine interface component. The laser transmission module contains two laser transmission channels: a light guide arm transmission channel and a flexible mid-infrared hollow fiber transmission channel, as well as a channel switching component. The channel switching component includes an input coupling end, a first output coupling end, a second output coupling end, and a switching actuator. The beam combining module contains an interface, a visible light incident channel, a metal film assembly, a beam combining lens, a light output port, a base, and a housing. The adjustable bracket includes an upper articulated arm and a middle articulated arm. The laser transmission module is located on the front side of the chassis, with its input end connected to the mid-infrared laser emitting module inside the chassis and its output end connected to the interface of the beam combining module; the beam combining module is located on the upper joint arm of the adjustable bracket; the visible laser emitting module is located on the upper side of the beam combining module; the temperature detection module is located on the middle joint arm of the adjustable bracket. The power supply module is connected to the intelligent control module, the mid-infrared laser emitting module, the human-machine interaction component, the laser transmission module, the visible laser emitting module, and the temperature detection module, respectively; the intelligent control module is connected to the mid-infrared laser emitting module, the human-machine interaction component, the laser transmission module, the visible laser emitting module, and the temperature detection module, respectively. The output end of the mid-infrared laser emitting module is connected to the input optical path of the channel switching component. The first output end of the channel switching component is connected to the input optical path of the light guide arm transmission channel. The second output end of the channel switching component is connected to the input optical path of the flexible mid-infrared hollow fiber transmission channel. The output ends of both the light guide arm transmission channel and the flexible mid-infrared hollow fiber transmission channel are connected to the interface selective optical path. The visible laser emitting module is connected to the visible light incident channel optical path. The mid-infrared laser propagates along the main optical path, and the visible laser propagates along the auxiliary optical path. The auxiliary optical path is coaxially arranged with the main optical path. The interface and the beam combiner... The mirror, the metal film assembly, and the light outlet are arranged sequentially along the propagation direction of the mid-infrared laser, and the visible light incident channel is located above the beam combining lens. The intelligent control module is used to control the channel switching assembly according to the operation signal of the human-machine interaction assembly, so that the mid-infrared laser is selectively transmitted to the interface through the light guide arm transmission channel or the flexible mid-infrared hollow fiber transmission channel, and the mid-infrared laser entering through the interface and the visible laser entering through the visible light incident channel form a coaxial optical path at the beam combining lens and jointly irradiate the metal film assembly. After being directionally scattered, expanded, and homogenized by the metal film assembly, the beam is output from the light outlet to the working area to form a beam-expanded and homogenized light spot.

[0007] Furthermore, the human-machine interaction component includes a display screen and buttons or a touch screen for inputting the working mode, laser transmission channel, target spot area, and safe temperature threshold; the switching actuator of the channel switching component is connected to the intelligent control module circuit to enable the input coupling terminal to conduct with one of the first output coupling terminal or the second output coupling terminal, and to keep the unselected transmission channel in a disconnected or light-blocked state.

[0008] Furthermore, the light guide arm transmission channel includes multiple hollow arm sections and multiple steering joints connected in sequence, with a reflector provided inside each steering joint; the output end of the light guide arm transmission channel is detachably coaxially connected to the interface via a light guide arm connector; the flexible mid-infrared hollow fiber transmission channel is a flexible metal or metal / dielectric mid-infrared hollow fiber, including a hollow light-passing cavity and a reflective functional layer disposed on the inner wall of the hollow light-passing cavity, the reflective functional layer being a metal layer or a metal / dielectric composite layer, and the output end of the flexible mid-infrared hollow fiber transmission channel is detachably coaxially connected to the interface via a threaded cap, ceramic sleeve, or metal sleeve.

[0009] Furthermore, the mid-infrared laser emitting module includes any one of a CO2 laser, an Er:YAG laser, and a wavelength-tunable mid-infrared laser; the mid-infrared laser emitting module is fixedly installed at the frontmost position inside the chassis, and its light emission axis is arranged along the front-to-back direction of the chassis.

[0010] Furthermore, the visible laser emitting module includes any one of a red laser, a green laser, a blue laser, and a wavelength-tunable visible laser; the visible laser emitting module is directly inserted into the visible light incident channel.

[0011] Furthermore, in the beam combining module, the interface is located at the center of the rear end of the housing and is used to receive mid-infrared laser from the laser transmission module; the visible light incident channel is located at the center of the upper wall of the housing; the beam combining lens is located on the main optical path in front of the interface; the metal film assembly is located in front of the beam combining lens and fixed on the base, and the base and the housing are detachably connected; the scattering surface of the metal film assembly is located in front of the main optical path and forms an angle of 5° to 85° with the central axis of the main optical path, and the angle is achieved by rotating the base.

[0012] Furthermore, the metal film assembly includes a substrate and a metal scattering layer coated on the surface of the substrate. The substrate is a glass sheet, quartz sheet, ceramic sheet or metal plate, and the metal scattering layer is an aluminum foil, copper foil, silver foil or gold foil, and its surface has a micro-nano-level irregular convex-concave light scattering structure. The back side of the substrate is in contact with and fixed to the base surface.

[0013] Furthermore, the beam combining lens is a zinc selenide lens, a chalcogenide glass lens, or a composite lens that transmits both mid-infrared and visible light, and the beam combining lens is installed in a lens mount.

[0014] Furthermore, the temperature detection module includes either an infrared temperature sensor or a thermocouple probe; when an infrared temperature sensor is used, the infrared temperature sensor is located on the side or outer periphery of the light outlet and faces the irradiation area; when a thermocouple probe is used, the thermocouple probe is connected to the intelligent control module through a wire and attached to the surface of the working area.

[0015] Furthermore, the intelligent control module includes a main control unit, a laser driving unit, a temperature measurement and acquisition unit, a human-machine interaction unit, and an alarm unit. The main control unit is circuitically connected to the laser driving unit, the temperature measurement and acquisition unit, the human-machine interaction unit, and the alarm unit. The laser driving unit is circuitically connected to the mid-infrared laser emitting module and the visible laser emitting module. The temperature measurement and acquisition unit is circuitically connected to the temperature detection module. The human-machine interaction unit is circuitically connected to the human-machine interaction component. The alarm unit includes a buzzer and an indicator light. The main control unit is used to control the output power and / or start / stop status of the mid-infrared laser emitting module and the visible laser emitting module based on the temperature signal from the temperature detection module.

[0016] Furthermore, the physiotherapy device has at least the following working modes: a. a visual working mode in which mid-infrared laser and visible laser are output synchronously; b. a working mode in which visible laser is output first for positioning, and after positioning is completed, the visible laser is turned off and only mid-infrared laser is output; c. a working mode in which only visible laser is output for superficial irradiation.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: (1) Using metal film components to replace the traditional multi-piece beam expander combination to achieve beam expansion and homogenization is cost-effective, convenient, and helps to simplify the beam head structure and provide adjustable irradiation range for different working areas.

[0018] (2) By introducing visible laser into the metal film directional scattering beam expansion homogenization and visible light beam combining module and forming coaxial propagation with mid-infrared laser, intuitive irradiation area indication can be provided during operation, which is convenient for operators to position.

[0019] (3) By setting up two transmission methods, namely the light guide arm transmission channel and the flexible mid-infrared hollow fiber transmission channel, the needs of light output direction adjustment and flexible operation can be met, thereby improving the applicability of the equipment in different physiotherapy scenarios.

[0020] (4) By forming a closed-loop control through the temperature detection module and the intelligent control module, the surface temperature of the working area can be monitored during use, and the laser output can be adjusted in linkage, which is conducive to improving the safety of equipment use.

[0021] By integrating the light source module, transmission module, beam combining module, and temperature control module of the physiotherapy device, it achieves advantages such as flexible laser transmission, adjustable beam expansion area, and controllable energy density, providing a cost-effective solution for beam expansion and homogenization physiotherapy of various lasers and broadening the application scenarios of laser physiotherapy equipment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the laser transmission module structure of the present invention; Figure 3 This is a schematic diagram of the longitudinal cross-sectional structure of the metal film directional scattering beam expansion and homogenization and visible light beam combining module of the present invention; Figure 4 This is a schematic diagram of the optical path within the metal film directional scattering beam expansion and homogenization and visible light beam combining module of the present invention in working mode a. Figure 5 This is a schematic diagram of the optical path within the metal film directional scattering beam expansion and homogenization and visible light beam combining module of the present invention in working mode b. Figure 6This is a schematic diagram of the optical path within the metal film directional scattering beam expansion and homogenization and visible light beam combining module of the present invention in working mode c. Figure 7 This is a schematic diagram of the structure and control flow of the intelligent control module of the present invention. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] See Figure 1 The present invention includes a chassis 10, a laser transmission module 20, a metal film directional scattering beam expansion and homogenization and visible light beam combining module 30, a visible laser emission module 40, a temperature detection module 50, and an adjustable bracket 60.

[0025] The chassis 10 is equipped with a power supply module 11, an intelligent control module 12 and a mid-infrared laser emitting module 13. A human-machine interaction component 14 is provided on the upper side of the chassis 10. The power supply module 11 is located at the rear of the chassis 10. The intelligent control module 12 is located in the middle of the chassis 10. The mid-infrared laser emitting module 13 is located at the front of the chassis 10.

[0026] See Figure 2 The channel switching component 23 enables mid-infrared laser to selectively enter the light guide arm transmission channel 21 or the flexible mid-infrared hollow fiber transmission channel 22, so as to adapt to the requirements of different working areas for light output direction and operational flexibility.

[0027] In one embodiment, the light guide arm of the light guide arm transmission channel 21 is composed of multiple hollow arm sections and multiple steering joints connected in sequence, and a reflector is provided in each steering joint; during operation, the operator changes the orientation of the light outlet 35 by adjusting the rotation angle of each steering joint of the light guide arm so that the expanded light spot can irradiate different working areas.

[0028] In another embodiment, the flexible mid-infrared hollow fiber of the flexible mid-infrared hollow fiber transmission channel 22 is a flexible metal or metal / dielectric mid-infrared hollow fiber, which includes a hollow optical cavity and a reflective functional layer disposed on the inner wall of the hollow optical cavity; the reflective functional layer is a metal layer or a metal / dielectric composite layer, the metal layer material includes aluminum, copper, silver, gold, etc., and the dielectric layer material includes silicon dioxide, titanium dioxide, silver iodide, aluminum oxide, etc.; during operation, the flexible mid-infrared hollow fiber can realize flexible guidance of mid-infrared laser during transmission, and can convert the Gaussian energy distribution output by the mid-infrared laser emitting module 13 into a multimode, multi-point energy distribution to a certain extent, so as to improve the uniformity of the beam spot after subsequent scattering and beam expansion by the metal film component 33.

[0029] The output end of the mid-infrared laser emitting module 13 is fixedly provided with a light output interface seat, which is coaxially connected to the laser transmission module 20 to ensure that the mid-infrared laser enters the beam combining module 30 along the predetermined central axis.

[0030] See Figure 3 The visible laser emitting module 40 is located in the visible light incident channel 32 of the beam combining module 30, and its output axis is set perpendicular to the mid-infrared laser optical axis, so that the visible laser coincides with the mid-infrared laser at the beam combining lens 34, thereby providing a visual indication of the working area.

[0031] The metal film assembly 33 is fixed to the substrate by optical adhesive bonding, vacuum coating, pressing and attaching, or mechanical pressing. The light-receiving surface of the metal film assembly 33 is inclined relative to the incident direction of the mid-infrared laser, and the angle between its surface and the central axis of the incident beam is 5°~85°, preferably 30°~60°. The tilt angle is set by rotating the base 36. The metal film assembly 33 can both divert the mid-infrared laser and visible laser incident on its surface and maintain a certain taper direction for the scattered light spot to be output from the light outlet. The light spot area of ​​the irradiation area can be changed by adjusting the distance between the light outlet 35 and the working area.

[0032] The mid-infrared laser and the visible laser propagate within the beam combining module according to the following optical paths: After being emitted by the mid-infrared laser emitting module 13, the mid-infrared laser is transmitted to the interface 31 via the laser transmission module 20 and enters the beam combining lens 34 along the central axis of the interface 31. After being collimated, focused, or shaped by the beam combining lens 34, the mid-infrared laser continues to propagate forward and is incident on the light-receiving surface of the metal film assembly 33. After being emitted by the visible laser emitting module 40, the visible laser enters the beam combining lens 34 from above and forms a coaxial beam with the mid-infrared laser at the beam combining lens 34, both of which are incident on the same light-receiving area of ​​the metal film assembly 33. After being directionally scattered by the metal film assembly 33, the laser is emitted from the light outlet 35, thereby forming a visual indicator spot on the human body surface corresponding to the mid-infrared light spot.

[0033] Based on the above-mentioned device, the present invention also provides a laser irradiation therapy method based on metal film directional scattering beam expansion, which includes the following steps: Step S1: Set the working mode, laser transmission channel, target spot area, and safe temperature threshold through the human-computer interaction component 14 according to the physiotherapy needs; Step S2: Start the mid-infrared laser emitting module 13 and / or the visible laser emitting module 40. The mid-infrared laser is transmitted through the laser transmission module 20 and enters the beam combining lens 34 through the interface 31. The visible laser is emitted from the visible laser emitting module 40 and enters the beam combining lens 34. The two lasers are incident on the metal film assembly 33. Step S3: Mid-infrared laser and / or visible laser are directionally scattered and expanded by metal film component 33 and emitted from light outlet 35, forming a physiotherapy spot with expanded beam and relatively uniform energy distribution in the working area; Step S4: The temperature detection module 50 detects the temperature of the working part in real time and feeds the temperature signal back to the intelligent control module 12. The intelligent control module 12 adjusts the output power of the mid-infrared laser emitting module 13 and / or the visible laser emitting module 40 according to the comparison result between the real-time temperature and the safe temperature threshold, so that the temperature of the working part is kept within a safe range. Example

[0034] See Figures 1 to 4 as well as Figure 7 This embodiment provides a laser irradiation therapy device based on metal film directional scattering beam expansion.

[0035] In this embodiment, the mid-infrared laser emitting module 13 is a small CO2 laser with an output wavelength of 10.6 μm and a power that is continuously adjustable in the range of 0~10 W; the visible laser emitting module 40 is a red laser with an output wavelength of 660 nm and a power that is continuously adjustable in the range of 0~10 W.

[0036] In this embodiment, the laser transmission module 20 uses a flexible mid-infrared hollow fiber transmission channel 22 as its working channel; the flexible mid-infrared hollow fiber is a polyimide / silver / silver iodide flexible mid-infrared hollow fiber; a polyimide capillary with an inner diameter of 2 mm, a wall thickness of 0.25 mm, and a length of 110 cm is selected as the structural tube, and its inner wall is pretreated to improve adhesion. Then, a silver reflective layer and a silver iodide dielectric layer are deposited sequentially on its inner surface using a dynamic liquid phase chemical deposition method to form a waveguide structure with low transmission loss and high flexibility in the 10.6 μm band; the output end of the flexible hollow fiber is detachably coaxially connected to the interface 31 through a threaded cap.

[0037] In this embodiment, the interface 31 is coupled to the light-emitting end of the aforementioned flexible hollow optical fiber using a threaded structure; the beam combining lens 34 is a convex lens made of zinc selenide; the metal film assembly 33 is constructed by smoothly attaching a silver foil with a surface roughness of approximately 0.5~2 μm onto an optical glass plate using UV-cured optical adhesive; the angle between the surface of the optical glass plate and the incident beam is 45°, and the vertical distance between the center of the silver foil surface and the light-emitting surface of the beam combining lens 34 is approximately 2~10 cm. During operation, the CO2 laser and the red laser, after being collimated by the beam combining lens 34, propagate coaxially and jointly irradiate the rough surface of the silver foil on the metal film assembly 33, resulting in directional scattering. The beam is expanded and deflected downwards by 90°, forming a near-flat-top beam spot with uniform energy distribution.

[0038] In this embodiment, the temperature detection module 50 adopts a non-contact infrared temperature sensor, which is set on the side of the light outlet and faces the irradiation area; the intelligent control module 12 adopts a microcontroller as the main control core and is connected to the laser driving unit, temperature acquisition unit, human-machine interaction unit and alarm unit respectively.

[0039] The working process of this embodiment is as follows: The operator selects the visualization working mode through the human-machine interface component 14, and adjusts the height and angle of the adjustable bracket 60 according to the area of ​​the working part and the expected irradiation range to adjust the distance between the light outlet 35 and the working part. The mid-infrared laser is transmitted to the interface 31 through the flexible mid-infrared hollow fiber transmission channel 22 and then enters the beam combining lens 34. The visible laser enters the beam combining lens 34 through the visible light incident channel 32. The two lasers jointly irradiate the metal film component 33 and are output to the working area through the light outlet 35. During operation, the temperature detection module 50 continuously detects the surface temperature of the working area and sends the temperature signal to the intelligent control module 12. When the detected temperature reaches the preset safe temperature threshold, the intelligent control module 12 controls the mid-infrared laser emitting module 13 to reduce the output power and / or pause the output, while driving the buzzer and indicator light to issue a prompt. When the detected temperature falls back to the set range, the intelligent control module 12 can restore the preset working power or maintain the adjusted power. Example

[0040] See Figures 1 to 3 , Figure 6 as well as Figure 7 This embodiment provides another way of working, which differs from Embodiment 1 mainly in that: In this embodiment, a 660 nm red laser is used as the working laser, and the mid-infrared laser emitting module 13 and the laser transmission module 20 are not used. The visible laser emitting module 40 is a red laser with an output wavelength of 660 nm and a power that is continuously adjustable in the range of 0~10W.

[0041] In this embodiment, the laser transmission module 20 uses the light guide arm transmission channel as the working channel 21; the operator can change the light output direction by adjusting the angle of each steering joint of the light guide arm to adapt to the irradiation needs of different parts such as the shoulder, waist, and joints.

[0042] In this embodiment, the temperature detection module 50 uses a thermocouple probe. The thermocouple probe is connected to the intelligent control module 12 via a wire and is attached to the surface of the working area to collect the surface temperature of the working area. The intelligent control module 12 adjusts the output power of the visible laser emission module 40 in conjunction with the temperature signal collected by the thermocouple probe.

[0043] The metal film component 33 is constructed by flatly attaching a gold foil with a surface roughness of about 0.5~2 μm onto an optical glass plate using UV-cured optical adhesive.

[0044] The main difference between the working process of this embodiment and that of embodiment 1 is that only the visible laser emission module 40 is turned on, so that the visible laser is output after being directionally scattered and expanded by the metal film component 33 for shallow irradiation.

[0045] The mechanism of action and advantages of this invention are as follows: The mid-infrared laser is stably transmitted to the metal film directional scattering, beam expansion, homogenization, and visible light beam combining module 30 via the laser transmission module 20. The light guide arm transmission method 21 allows for flexible adjustment of the output direction, while the flexible mid-infrared hollow fiber transmission method 22 further enables efficient, stable, and flexible laser transmission, and helps transform the Gaussian energy distribution spot output by the mid-infrared laser emitting module 13 into a multimode, multi-point energy distribution spot. Subsequently, the mid-infrared laser and visible indicator light are combined at the beam combining lens 34, and then directionally scattered, expanded, and homogenized by the metal film assembly 33, forming a near-flat-top spot with adjustable irradiation area and uniform energy distribution. This expands the irradiation area while reducing the risk of local overheating and thermal damage. Simultaneously, the visible light indicator light path enables real-time visualization of the working area, improving positioning accuracy and operational convenience. The integrated intelligent control module 12 monitors the temperature of the working area in real time using infrared or thermocouple probes, keeping the temperature within a safe range, thus achieving safe, uniform, and visualized non-invasive mid-infrared laser therapy. In addition, its working modes include a visualization working mode that outputs mid-infrared laser and visible laser simultaneously; a working mode that outputs visible laser first for positioning, and then turns off the visible laser and outputs only mid-infrared laser after positioning is completed; and a working mode that outputs only visible laser for shallow irradiation.

[0046] The specific forms of the mid-infrared laser emitting module 13, visible laser emitting module 40, metal film assembly 33, beam combining lens 34, temperature detection module 50, and adjustable bracket 60 described in Embodiments 1 and 2 above can all be replaced accordingly within the scope of the claims. For example, the mid-infrared laser emitting module 13 can be replaced with an Er:YAG laser or a wavelength-tunable mid-infrared laser, the visible laser emitting module 40 can be replaced with a green laser or a blue laser, and the metal scattering layer 33 can be made of aluminum foil, copper foil, silver foil, or gold foil.

[0047] The above embodiments are merely preferred embodiments of the present invention, used to illustrate the structural composition, connection relationships, and working process of the present invention, and are not intended to limit the scope of protection of the present invention. Any non-substantial modifications and substitutions made by those skilled in the art based on the disclosure of the present invention should fall within the scope of protection of the present invention.

Claims

1. A laser irradiation physiotherapy apparatus based on metal film directional scattering beam expansion, characterized in that, It includes a chassis (10), a laser transmission module (20), a metal film directional scattering beam expansion and homogenization and visible light beam combining module (30), a visible laser emission module (40), a temperature detection module (50), and an adjustable bracket (60). The chassis (10) is equipped with a power supply module (11), an intelligent control module (12), and a mid-infrared laser emission module (13). The chassis (10) is equipped with a human-machine interaction component (14). The laser transmission module (20) is equipped with two laser transmission channels: a light guide arm transmission channel (21) and a flexible mid-infrared hollow fiber transmission channel (22), as well as a channel switching component (23). The channel switching component (23) includes an input coupling end, a first output coupling end, a second output coupling end, and a switching actuator. The beam combining module (30) is equipped with an interface (31), a visible light incident channel (32), a metal film component (33), a beam combining lens (34), a light outlet (35), a base (36), and a shell (37). The adjustable bracket (60) is equipped with an upper articulated arm (61) and a middle articulated arm (62). The laser transmission module (20) is located on the front side of the chassis (10), with its input end connected to the mid-infrared laser emitting module (13) inside the chassis and its output end connected to the interface (31) of the beam combining module (30); the beam combining module (30) is located on the upper joint arm (61) of the adjustable bracket (60); the visible laser emitting module (40) is located on the upper side of the beam combining module (30); the temperature detection module (50) is located on the middle joint arm (62) of the adjustable bracket (60); The power supply module (11) is electrically connected to the intelligent control module (12), the mid-infrared laser emitting module (13), the human-computer interaction component (14), the laser transmission module (20), the visible laser emitting module (40), and the temperature detection module (50), respectively; the intelligent control module (12) is electrically connected to the mid-infrared laser emitting module (13), the human-computer interaction component (14), the laser transmission module (20), the visible laser emitting module (40), and the temperature detection module (50), respectively; The light-emitting end of the mid-infrared laser emitting module (13) is connected to the input optical path of the channel switching component (23). The first output end of the channel switching component (23) is connected to the input optical path of the light guide arm transmission channel (21). The second output end of the channel switching component (23) is connected to the input optical path of the flexible mid-infrared hollow fiber transmission channel (22). The output ends of the light guide arm transmission channel (21) and the flexible mid-infrared hollow fiber transmission channel (22) are both connected to the selective optical path of the interface (31). The visible laser emitting module (40) is connected to the visible light incident channel (32). The mid-infrared laser propagates along the main optical path, and the visible laser propagates along the auxiliary optical path. The auxiliary optical path is coaxially arranged with the main optical path. The interface (31), the beam combining lens (34), and the metal The film assembly (33) and the light outlet (35) are arranged sequentially along the propagation direction of the mid-infrared laser. The visible light incident channel (32) is located on the upper side of the beam combining lens (34). The intelligent control module (12) is used to control the channel switching component (23) according to the operation signal of the human-machine interaction component (14), so that the mid-infrared laser is selectively transmitted to the interface (31) through the light guide arm transmission channel (21) or the flexible mid-infrared hollow fiber transmission channel (22). The mid-infrared laser entering through the interface (31) and the visible laser entering through the visible light incident channel (32) form a coaxial optical path at the beam combining lens (34) and then jointly irradiate the metal film assembly (33). After the metal film assembly (33) directionally scatters, expands, and homogenizes the beam, it is output from the light outlet (35) to the working area to form a beam-expanded and homogenized light spot.

2. The physiotherapy apparatus according to claim 1, characterized in that The human-machine interaction component (14) includes a display screen and buttons or a touch screen for inputting the working mode, laser transmission channel, target spot area, and safe temperature threshold; the channel switching component (23) includes an input coupling end, a first output coupling end, a second output coupling end, and a switching actuator. The switching actuator is circuitally connected to the intelligent control module (12) for making the input coupling end conduct with one of the first output coupling end or the second output coupling end, and making the unselected transmission channel in a disconnected or light-blocked state.

3. The physiotherapy apparatus according to claim 1, characterized in that, The light guide arm transmission channel (21) includes multiple hollow arm sections and multiple steering joints connected in sequence, and each steering joint is provided with a reflector; the output end of the light guide arm transmission channel (21) is detachably coaxially connected to the interface (31) through a light guide arm connector; the flexible mid-infrared hollow fiber transmission channel (22) is a flexible metal or metal / dielectric mid-infrared hollow fiber, including a hollow light-transmitting cavity and a reflective functional layer disposed on the inner wall of the hollow light-transmitting cavity, the reflective functional layer being a metal layer or a metal / dielectric composite layer, and the output end of the flexible mid-infrared hollow fiber transmission channel (22) is detachably coaxially connected to the interface (31) through a threaded cap, ceramic sleeve or metal sleeve.

4. The physiotherapy apparatus according to claim 1, characterized in that, The mid-infrared laser emitting module (13) includes any one of a CO2 laser, an Er:YAG laser, and a wavelength-tunable mid-infrared laser; the mid-infrared laser emitting module (13) is fixedly installed at the front end of the chassis (10), and its light output axis is arranged along the front-rear direction of the chassis.

5. The physiotherapy apparatus according to claim 1, characterized in that, The visible laser emitting module (40) includes any one of a red laser, a green laser, a blue laser, and a wavelength-tunable visible laser; the visible laser emitting module (40) is directly inserted into the visible light incident channel (32).

6. The physiotherapy device according to claim 1, characterized in that, In the beam combining module (30), the interface (31) is located at the center of the rear end of the housing (37) and is used to receive mid-infrared laser from the laser transmission module (20); the visible light incident channel (32) is located at the center of the upper wall of the housing (37); the beam combining lens (34) is located on the main optical path in front of the interface (31); the metal film assembly (33) is located in front of the beam combining lens (34) and fixed on the base (36), and the base (36) and the housing (37) are detachably connected; the scattering surface of the metal film assembly (33) is located in front of the main optical path and forms an angle of 5°~85° with the central axis of the main optical path, and the angle is achieved by rotating the base (36).

7. The physiotherapy device according to claim 1, characterized in that, The metal film assembly (33) includes a substrate and a metal scattering layer covering the surface of the substrate. The substrate is a glass sheet, quartz sheet, ceramic sheet or metal plate. The metal scattering layer is an aluminum foil, copper foil, silver foil or gold foil, and its surface has a micro-nano-level irregular convex-concave light scattering structure. The back side of the substrate is in contact with and fixed to the surface of the base (36).

8. The physiotherapy device according to claim 1, characterized in that, The beam combining lens (34) is a zinc selenide lens, a chalcogenide glass lens, or a composite lens that transmits both mid-infrared and visible light, and the beam combining lens (34) is installed in a lens mount.

9. The physiotherapy device according to claim 1, characterized in that, The temperature detection module (50) includes either an infrared temperature sensor or a thermocouple probe. When an infrared temperature sensor is used, the infrared temperature sensor is located on the side or outer periphery of the light outlet (35) and faces the irradiation area. When a thermocouple probe is used, the thermocouple probe is connected to the intelligent control module (12) through a wire and attached to the surface of the working area.

10. The physiotherapy device according to claim 1, characterized in that, The intelligent control module (12) includes a main control unit, a laser drive unit, a temperature acquisition unit, a human-machine interaction unit, and an alarm unit. The main control unit is connected to the laser drive unit, the temperature acquisition unit, the human-machine interaction unit, and the alarm unit. The laser drive unit is connected to the mid-infrared laser emitting module (13) and the visible laser emitting module (40). The temperature acquisition unit is connected to the temperature detection module (50). The human-machine interaction unit is connected to the human-machine interaction component (14). The alarm unit includes a buzzer and an indicator light. The main control unit is used to control the output power and / or start / stop status of the mid-infrared laser emitting module (13) and the visible laser emitting module (40) according to the temperature signal of the temperature detection module (50).

11. The physiotherapy device according to claim 1, characterized in that, The physiotherapy device has at least the following working modes: a. a visual working mode in which mid-infrared laser and visible laser are output simultaneously; b. a working mode in which visible laser is output first for positioning, and after positioning is completed, the visible laser is turned off and only mid-infrared laser is output; c. a working mode in which only visible laser is output for superficial irradiation.

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