Laser medical device

Abstract

The utility model relates to the technical field of medical equipment, and provides a laser medical device. The laser medical device comprises a laser oscillation module, a mode selection module and an optical fiber coupling module. The laser oscillation module is used for generating laser; the mode selection module is in signal connection with the laser oscillation module and is used for adjusting the laser oscillation module, so that the laser oscillation module at least operates in a continuous operation mode, a quasi-continuous operation mode, a continuous Q-switching operation mode, a quasi-continuous same-frequency Q-switching operation mode or a quasi-continuous difference-frequency Q-switching operation mode; and the optical fiber coupling module is connected with an outlet of the laser oscillation module and is used for coupling the laser and the indication light. The laser medical device overcomes the defects that a thulium-doped laser in the prior art is relatively single in working mode and has limitation when dealing with various operation requirements, can achieve free switching of various modes, enables medical staff to deal with various conditions to carry out operations without replacing equipment, and improves the working efficiency of the laser medical device. And the operation efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a laser medical device. Background Art

[0002] Laser has gradually become a unique medical tool with its advantages of monochromaticity, high energy density and controllability. In particular, the 2-micron laser, whose wavelength is near the absorption peak of water, is more easily absorbed and converted by tissues, with a very small damaged area and good blood coagulation effect. Therefore, it is very suitable for high-precision minimally invasive medical surgeries in fields such as ophthalmology, dermatology and urology.

[0003] In recent years, thulium-doped solid-state lasers have attracted attention in the field of laser medical surgery. Compared with traditional holmium-doped solid-state lasers, thulium-doped solid-state lasers have higher average power and repetition rate, faster cutting speed, and can significantly improve surgical efficiency. At the same time, its radiation wavelength is closer to the absorption peak of water, and its penetration depth is shallow, which helps to reduce the risk of large-area bleeding in tissues and provides a certain guarantee for surgical safety. However, the working mode of the thulium-doped lasers currently developed is relatively single, and there are limitations in responding to various surgical needs. Taking kidney stone lithotripsy as an example, continuous lasers and long pulse lasers are needed to treat kidney soft tissue and kidney stones at different stages. This situation leads to the necessity of equipment switching and increases the complexity of the operation. In addition, some highly calcified parts of the human body are fused with soft tissue and hard tissue, which requires the use of continuous lasers combined with short pulse lasers with higher energy density when treating these areas, so a single device cannot meet all operational needs. Furthermore, the current adjustable range of output power, repetition frequency, and pulse width of a single thulium-doped laser is limited. For example, the same device cannot simultaneously cover the laser output in the nanosecond and microsecond pulse ranges, which limits its applicability in scenarios that require more precise cutting, thereby prolonging the operation time and increasing the surgical risk. Utility Model Content

[0004] The utility model provides a laser medical device to solve the defects of the prior art that the working mode of thulium-doped laser is relatively single and has limitations when responding to various surgical needs, and realizes a laser medical device that can freely switch between multiple modes, so that medical staff can perform surgery in response to various situations without changing equipment, thereby greatly improving the efficiency of the surgery.

[0005] The utility model provides a laser medical device, comprising:

[0006] A laser oscillation module, used for generating laser;

[0007] A mode selection module, connected to the laser oscillation module signal, for adjusting the laser oscillation module so that the laser oscillation module operates at least in a continuous operation mode, a quasi-continuous operation mode, a continuous Q-switched operation mode, a quasi-continuous same-frequency Q-switched operation mode, or a quasi-continuous difference-frequency Q-switched operation mode;

[0008] The optical fiber coupling module is connected to the outlet of the laser oscillation module and is used for coupling the laser and the indicator light.

[0009] According to a laser medical device provided by the utility model, the laser oscillation module includes a semiconductor pump module and a shell, and a resonant cavity is provided in the shell;

[0010] A first mirror body, a thulium-doped gain crystal, an optical modulator, and a second mirror body are sequentially arranged inside the resonant cavity, and the center lines of the first mirror body, the thulium-doped gain crystal, the optical modulator, and the second mirror body are located on the same straight line;

[0011] The semiconductor pump module is arranged outside the resonant cavity and located at one end of the first mirror body. The semiconductor pump module is arranged corresponding to the end surface of the thulium-doped gain crystal.

[0012] According to a laser medical device provided by the utility model, the laser oscillation module includes a semiconductor pump module and a resonant cavity;

[0013] A first mirror body, a thulium-doped gain crystal, an optical modulator, a thulium-doped gain crystal, and a second mirror body are sequentially arranged inside the resonant cavity, and the center lines of the first mirror body, the thulium-doped gain crystal, the optical modulator, and the second mirror body are located on the same straight line;

[0014] The semiconductor pump module is arranged inside the resonant cavity, and the semiconductor pump module is arranged on the side of the thulium-doped gain crystal.

[0015] According to a laser medical device provided by the utility model, the surface of the first mirror body is coated with a total reflection film for the 0° angle oscillation laser wavelength, and the reflectivity R of the total reflection film is greater than 99.5%;

[0016] The surface of the second mirror body is coated with a partial reflection film for the incident laser wavelength at an angle of 0°, and the reflectivity R of the partial reflection film is ≤90%.

[0017] According to a laser medical device provided by the utility model, the laser oscillation module further comprises a temperature controller, and the temperature controller is used to adjust the temperature of the semiconductor pump module and the thulium-doped gain crystal.

[0018] According to a laser medical device provided by the utility model, the mode selection module includes a control circuit and a Q-switched driver, the semiconductor pump module, the optical modulator and the Q-switched driver are all connected to the control circuit signal, and the control circuit is used to control the working status of the semiconductor pump module, the optical modulator and the Q-switched driver.

[0019] According to a laser medical device provided by the utility model, the fiber coupling module includes a fiber coupler and a light gate, the fiber coupler is used to couple the laser and the indicator light, the output end of the fiber coupler is connected to an optical fiber, and the light gate is arranged at the input end of the fiber coupler or at the optical fiber.

[0020] According to a laser medical device provided by the utility model, the optical fiber is also provided with an endoscope, and the endoscope is used to observe the coupled indicator light.

[0021] According to a laser medical device provided by the utility model, the thulium-doped gain crystal includes a rod-shaped structure and a slat structure.

[0022] According to a laser medical device provided by the utility model, the resonant cavity includes a plano-planar cavity, a plano-convex cavity and an unstable cavity.

[0023] The above one or more technical solutions in the embodiments of the utility model have at least one of the following technical effects:

[0024] The utility model controls the laser oscillation module through the mode selection module, so that the laser oscillation module can switch between continuous operation, quasi-continuous operation, continuous Q-switched operation, quasi-continuous same-frequency Q-switched operation or quasi-continuous difference-frequency Q-switched operation mode. When used for soft tissue cutting and internal stone crushing, the utility model can be switched to continuous operation or quasi-continuous operation; when used for cutting hard tissues such as calcification or cartilage, the utility model can be switched to continuous Q-switched operation, quasi-continuous same-frequency Q-switched operation or quasi-continuous difference-frequency Q-switched operation mode. The utility model can cope with various complex medical surgical needs such as soft tissue cutting, internal stone crushing, and calcification and cartilage hard tissue resection through a single device, which not only improves surgical efficiency but also reduces surgical risks for patients. At the same time, the device has a simple structure and can be used in multiple ways, which reduces procurement and surgical costs and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is one of the structural schematic diagrams of the laser medical device provided by the utility model;

[0027] Figure 2 This is the second structural schematic diagram of the laser medical device provided by the utility model;

[0028] Figure 3 It is a timing diagram of the laser medical device provided by the utility model in the continuous operation mode and the continuous Q-switched operation mode;

[0029] Figure 4 The utility model provides a timing diagram of the laser medical device in a quasi-continuous operation mode, a quasi-continuous same-frequency Q-switched operation mode and a quasi-continuous difference-frequency Q-switched operation mode.

[0030] Reference numerals:

[0031] 100: laser oscillation module; 110: semiconductor pump module; 120: first mirror body; 130: thulium-doped gain crystal; 140: optical modulator; 150: second mirror body;

[0032] 200: mode selection module; 210: control circuit; 211: first circuit; 212: second circuit; 213: third circuit; 214: fourth circuit; 220: Q-switched driver; 221: first same-frequency working state; 222: second same-frequency working state;

[0033] 300: fiber coupling module; 310: fiber coupler; 320: optical shutter; 330: optical fiber; 340: endoscope; 350: coupling light;

[0034] 410: continuous laser timing; 420: continuous Q-switched laser timing;

[0035] 510: quasi-continuous laser timing; 520: quasi-continuous same-frequency Q-switched laser timing; 530: quasi-continuous difference-frequency Q-switched laser timing. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "first" and "second" are numbered for the purpose of clearly explaining the product components and do not represent any substantial difference. The directions of "upper" and "lower" shall be based on the directions shown in the accompanying drawings. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to the specific circumstances. In addition, the meaning of "multiple" is two or more. In the specification, "and / or" means at least one of the connected objects, and the character " / " generally indicates that the related objects before and after are in an "or" relationship.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Figure 1 One of the structural schematic diagrams of the laser medical device provided by the embodiment of the utility model is illustrated; Figure 2 The second structural schematic diagram of the laser medical device provided in the embodiment of the utility model is illustrated.

[0040] Reference Figure 1 or Figure 2 The laser medical device provided by the embodiment of the utility model includes a laser oscillation module 100, a mode selection module 200 and an optical fiber coupling module 300. The laser oscillation module 100 is used to generate laser light; the mode selection module 200 is connected to the laser oscillation module 100 for signal adjustment, so that the laser oscillation module 100 operates at least in a continuous operation, quasi-continuous operation, continuous Q-switched operation, quasi-continuous same-frequency Q-switched operation or quasi-continuous difference-frequency Q-switched operation mode; the optical fiber coupling module 300 is connected to the outlet of the laser oscillation module 100 for coupling the laser light with the indicator light.

[0041] The utility model controls the laser oscillation module 100 through the mode selection module 200, so that the laser oscillation module 100 can be switched between continuous operation, quasi-continuous operation, continuous Q-switched operation, quasi-continuous same-frequency Q-switched operation or quasi-continuous difference-frequency Q-switched operation. When used for soft tissue cutting and in vivo lithotripsy, the utility model can be switched to continuous operation or quasi-continuous operation; when used for cutting hard tissues such as calcification or cartilage, the utility model can be switched to continuous Q-switched operation, quasi-continuous same-frequency Q-switched operation or quasi-continuous difference-frequency Q-switched operation. This allows staff to switch functions on only one device in response to different environments, which not only improves the work efficiency of medical staff, but also significantly reduces the surgical risks of patients.

[0042] Reference Figure 1 In some embodiments of the utility model, the laser oscillation module 100 includes a semiconductor pump module 110 and a shell, and a resonant cavity is arranged in the shell; a first mirror body 120, a thulium-doped gain crystal 130, an optical modulator 140 and a second mirror body 150 are sequentially arranged inside the resonant cavity, and the center lines of the first mirror body 120, the thulium-doped gain crystal 130, the optical modulator 140 and the second mirror body 150 are located on the same straight line; the semiconductor pump module 110 is arranged outside the resonant cavity and is located at one end of the first mirror body 120, and the semiconductor pump module 110 is arranged corresponding to the end surface of the thulium-doped gain crystal 130.

[0043] It can be understood that the first mirror body 120 is an input mirror, which can allow the laser output by the semiconductor pump module 110 to pass through, and can also reflect the laser on the side of the first mirror body 120 facing the thulium-doped gain crystal 130, and the second mirror body 150 can be a coupling output mirror. In this embodiment, the surface of the first mirror body 120 is coated with a total reflection film for the oscillation laser wavelength at an angle of 0°, and the total reflection film for the oscillation laser wavelength has a reflectivity R>99.5% for the oscillation laser wavelength (2μm) and a reflectivity R<3% for the incident pump laser wavelength (760nm-810nm). The surface of the second mirror body 150 is coated with a partial reflection film for the incident laser wavelength at an angle of 0°, and the reflectivity R≤90% of the partial reflection film. The thulium-doped gain crystal 130 includes but is not limited to a rod-shaped structure and a slab structure.

[0044] Specifically, the central wavelength range of the semiconductor pump module 110 is 780nm-800nm, and the positional relationship between the semiconductor pump module 110 and the thulium-doped gain crystal 130 needs to make the laser generated by the semiconductor pump module 110 vertically enter from the end face of the thulium-doped gain crystal 130, that is, the semiconductor pump module 110 works in an end-face pumping manner. The reflectivity R of the first mirror body 120 is greater than 99.5%, and the reflectivity R of the second mirror body 150 is 90%. The thulium-doped gain crystal 130 is a Tm:YAG crystal (thulium-doped yttrium aluminum garnet crystal) and has a rod-shaped structure. Both ends of the crystal are bonded with undoped white YAG to reduce reabsorption loss and alleviate thermal lens effect. The optical modulator 140 is an acousto-optic modulator that periodically controls the loss in the optical resonant cavity based on the repetition frequency set by the driver. The wavelength of the thulium laser generated in the laser oscillation module 100 is 2020nm.

[0045] Specifically, the shell is a long strip structure, specifically a cylindrical structure, and an outlet is provided at one end of the shell, the function of which is to facilitate the projection of the generated laser. The other end is in a sealed edge state or is also provided with an opening, and a cover is provided at the opening. The first mirror body 120, the thulium-doped gain crystal 130, the optical modulator 140 and the second mirror body 150 are arranged from one end of the resonant cavity to the other end, that is, the second mirror body 150 is arranged at one end close to the outlet, and the first mirror body 120 is arranged at the other end. The semiconductor pump module 110 is also arranged inside the shell but outside the resonant cavity. It can be understood that another cavity outside the resonant cavity is also provided inside the shell, and the two cavities are interconnected and coaxially arranged. The laser generated by the semiconductor pump module 110 can be emitted from another cavity into the interior of the resonant cavity, and then emitted through the resonant cavity. It should be noted that the semiconductor pump module 110, the first mirror body 120, the thulium-doped gain crystal 130, the optical modulator 140 and the second mirror body 150 are arranged in the position of the shell so that the laser generated by the semiconductor pump module 110 passes through the first mirror body 120, the thulium-doped gain crystal 130, the optical modulator 140 and the second mirror body 150 in sequence and finally emits from the outlet of the shell.

[0046] In this embodiment, the semiconductor pump module 110 includes a semiconductor laser and a driving power supply, and the driving power supply provides an appropriate current to the semiconductor laser to put it in an appropriate working state. Its current is a pulse current, which can excite the semiconductor laser to generate laser pulses. In addition, the driving power supply can provide an appropriate voltage to maintain the forward bias of the semiconductor laser to ensure the normal operation of the laser. When the semiconductor laser is working, it will generate high-energy photons for exciting subsequent laser media.

[0047] The first mirror body 120 is used to reflect the generated photons so that the photons propagate back and forth in the laser medium. This helps to form laser oscillation. The first mirror body 120 mainly reflects lasers with a wavelength of 2 microns. Some lasers with other wavelengths can pass through, for example, the laser generated by the semiconductor pump module 110 can pass through the first mirror body 120. The thulium-doped gain crystal 130 is a laser medium, which is a solid-state laser medium doped with thulium. When receiving the energy provided by the semiconductor pump module 110, the thulium-doped gain crystal 130 will produce a laser amplification effect. The optical modulator 140 is used to modulate the frequency, phase or amplitude of the laser, and can be used to adjust the characteristics of the laser to meet the needs of different applications. The second mirror body 150 is a translucent mirror that allows part of the laser to pass through, while the other part is reflected, which is used to couple out the laser from the laser.

[0048] The working principle of the laser oscillation module 100 is as follows: the semiconductor pump module 110 provides energy and excites the thulium-doped gain crystal 130. The laser in the thulium-doped gain crystal 130 is reflected back and forth by the first mirror body 120, thereby forming laser oscillation. The laser is also modulated by the optical modulator 140 to meet the needs of different applications. Finally, a part of the laser is output through the second mirror body 150 to become the final laser output.

[0049] Reference Figure 2 In some embodiments of the present invention, the laser oscillation module 100 includes a semiconductor pump module 110 and a resonant cavity; a first mirror body 120, a thulium-doped gain crystal 130, an optical modulator 140, a thulium-doped gain crystal 130, and a second mirror body 150 are sequentially arranged inside the resonant cavity, and the center lines of the first mirror body 120, the thulium-doped gain crystal 130, the optical modulator 140, and the second mirror body 150 are located on the same straight line. The semiconductor pump module 110 is arranged inside the resonant cavity, and the semiconductor pump module 110 is arranged on the side of the thulium-doped gain crystal 130.

[0050] It can be understood that the first mirror body 120 is a reflector, which can only reflect the laser on the side of the first mirror body 120 facing the thulium-doped gain crystal 130, and the second mirror body 150 can be a coupling output mirror. In this embodiment, the surface of the first mirror body 120 is coated with a total reflection film for the 0° oscillation laser wavelength, and the reflectivity of the total reflection film is R>99.5%, and the surface of the second mirror body 150 is coated with a partial reflection film for the 0° incident laser wavelength, and the reflectivity of the partial reflection film is R<90%. The thulium-doped gain crystal 130 includes but is not limited to a rod-shaped structure and a slat structure.

[0051] It should be noted that, compared with the previous embodiment, two groups of semiconductor pump modules 110 and thulium-doped gain crystals 130 are provided in this embodiment. The two groups of semiconductor pump modules 110 and thulium-doped gain crystals 130 are respectively arranged on both sides of the optical modulator 140, and each group of semiconductor pump modules 110 is arranged on the side of the same group of thulium-doped gain crystals 130, and the two groups of semiconductor pump modules 110 are connected to the mode selection module 200 by signal. In this embodiment, the thulium-doped gain crystal 130 is a Tm:YAG crystal (thulium-doped yttrium aluminum garnet crystal) and has a slab structure. The central wavelength of the semiconductor pump module 110 is 780nm, and the pumping method is slab large surface side pumping. The reflectivity R of the second mirror body 150 is 70%.

[0052] When the operation mode is continuous operation, the output power can reach 1000W; when the operation mode is continuous Q-switched operation, the peak power can reach 5MW, and the repetition frequency is 100Hz-10kHz; when the operation mode is quasi-continuous operation, the peak power can reach 5kW, and the repetition frequency is 1Hz-1000Hz; when the operation mode is quasi-continuous Q-switched operation, the peak power can reach 1MW, and the repetition frequency is 1Hz-100Hz. Among them, by adjusting the repetition frequency of the mode selection module 200, multiple sub-pulse laser outputs can be achieved in the quasi-continuous Q-switched operation mode, which is conducive to further improving the lithotripsy efficiency and tissue cutting efficiency.

[0053] In some embodiments of the present invention, the laser oscillation module 100 further includes a temperature controller (not shown in the figure), which is used to adjust the temperature of the semiconductor pump module 110 and the thulium-doped gain crystal 130. Specifically, when the semiconductor pump module 110 is continuously pumped, the cooling water temperature of the semiconductor pump module 110 is T1; when the semiconductor pump module 110 is quasi-continuously pumped, the cooling water temperature of the semiconductor pump module 110 is T2. Wherein, T2>T1, to compensate for the absorption efficiency of the blue shift loss of the central wavelength of the semiconductor pump module 110 during quasi-continuous pumping. The cooling water temperature of the thulium-doped gain crystal 130 is T3, where T3>10°C, to prevent frost on the end face of the crystal from damaging the optical film layer.

[0054] Figure 3 The timing diagram of the laser medical device provided by the embodiment of the utility model in the continuous operation mode and the continuous Q-switched operation mode is illustrated; Figure 4 The timing diagram of the laser medical device provided by the embodiment of the utility model in the quasi-continuous operation mode, the quasi-continuous same-frequency Q-switched operation mode and the quasi-continuous difference-frequency Q-switched operation mode is illustrated. ( Figure 3 and Figure 4 In the figure, the X-axis represents time and the Y-axis represents the amplitude of the pulse.

[0055] Reference Figure 1 or Figure 2In some embodiments of the present invention, the mode selection module 200 includes a control circuit 210 and a Q-switched driver 220. The semiconductor pump module 110, the optical modulator 140 and the Q-switched driver 220 are all connected to the control circuit 210 by signal. The control circuit 210 is used to control the working states of the semiconductor pump module 110, the optical modulator 140 and the Q-switched driver 220.

[0056] The control circuit 210 receives the operation instruction and can switch the pumping mode (continuous pumping and quasi-continuous pumping) of the semiconductor pump module 110 and control the working state of the Q-switching driver 220 and the optical modulator 140 to realize the selection of the operation mode of the optical resonant cavity. When the Q-switching driver 220 and the optical modulator 140 are in the off state, the semiconductor pump module 110 is switched to continuous pumping or quasi-continuous pumping at the same time, and the continuous or quasi-continuous operation mode can be realized; when the Q-switching driver 220 and the optical modulator 140 are in the on state, the semiconductor pump module 110 is switched to continuous pumping or quasi-continuous pumping at the same time, and the continuous Q-switching or quasi-continuous Q-switching operation mode can be realized. Among them, the quasi-continuous Q-switching operation mode is divided into quasi-continuous same-frequency Q-switching operation and quasi-continuous difference-frequency Q-switching operation. When the frequency of the Q-switching driver 220 is the same as the quasi-continuous pumping frequency of the semiconductor pump module 110, the quasi-continuous same-frequency Q-switching operation is realized, and one pump pulse contains one nanosecond short pulse; when the frequency of the Q-switching driver 220 is different from the quasi-continuous pumping frequency of the semiconductor pump module 110, and the Q-switching frequency is [n / pump pulse width] (n≥2, [] is the integer symbol), the quasi-continuous difference-frequency Q-switching operation is realized, and one pump pulse contains n nanosecond short pulses.

[0057] In some possible embodiments, the control circuit 210 is provided with a first circuit 211, a second circuit 212, a third circuit 213 and a fourth circuit 214; the Q-switched driver 220 is provided with a first same-frequency working state 221 and a second same-frequency working state 222. The control circuit 210 receives an operation instruction to control the pumping mode of the semiconductor pump module 110 and the working state of the Q-switched driver 220, so as to realize the switching of the present invention among continuous operation, quasi-continuous operation, continuous Q-switched operation and quasi-continuous Q-switched operation (including quasi-continuous same-frequency Q-switched operation or quasi-continuous difference-frequency Q-switched operation).

[0058] When the control circuit 210 switches to the first circuit 211, the semiconductor pump module 110 is continuously pumped and the Q-switched driver 220 is in the off state, the operation mode of the device is continuous operation, and the laser output timing is as shown in the attached Figure 3 At this time, the laser output is a continuous laser sequence 410, with an output power range of 0.1W-200W, which is used for soft tissue cutting.

[0059] When the control circuit 210 switches to the second circuit 212, the semiconductor pump module 110 is continuously pumped and the Q-switching driver 220 is in the on state, the operation mode of the device is continuous Q-switching operation, and the laser output timing is as shown in the attached Figure 3 The laser output at this time is a continuous Q-switched laser with a timing of 420, a peak power of 1W-100kW, a repetition frequency range of 100Hz-10kHz, and a pulse width of 100ns-1000ns, which is used for stone powderization and tissue cutting.

[0060] When the control circuit 210 switches to the third circuit 213, the semiconductor pump module 110 is quasi-continuously pumped and the Q-switched driver 220 is in the off state, the device operation mode is quasi-continuous operation, and the laser output timing is as shown in the attached Figure 4 At this time, the laser output is a quasi-continuous laser sequence 510, with a peak power of 1W-1000W, a repetition frequency range of 1Hz-1000Hz, and a pulse width of 50μs-1000μs, which is used for stone crushing.

[0061] When the control circuit 210 switches to the fourth circuit 214 , the semiconductor pump module 110 performs quasi-continuous pumping and the Q-switching driver 220 is in an on state, and the operation mode of the device is quasi-continuous Q-switching operation.

[0062] When the Q-switched driver 220 switches to the first co-frequency working state 221, the laser output timing is as shown in the attached figure. Figure 3 As shown, the laser output at this time is a quasi-continuous same-frequency Q-switched laser timing 520, with an output power of 1W-50kW, a repetition frequency range of 1Hz-100Hz, and a pulse width of 100ns-1000ns, which is used for cutting hard tissues such as calcification or cartilage;

[0063] When the Q-switched driver 220 switches to the second co-frequency working state 222, the laser output timing is as shown in the attached figure. Figure 3 As shown, the laser output at this time is a quasi-continuous difference frequency Q-switched laser sequence 530, and the average output power is the same as that of the quasi-continuous same frequency Q-switched laser, but the peak power is reduced by about 1 / 3, which can further avoid tissue damage.

[0064] The five operation modes can be quickly switched through the control circuit 210 and the Q-switched driver 220, and the laser output power, repetition frequency and pulse width have a wide adjustment range, ensuring sufficient peak power and pulse duration. A single device can cope with various complex medical surgical needs such as soft tissue cutting, internal stone crushing, and calcification and cartilage hard tissue resection, which not only improves surgical efficiency but also reduces surgical risks for patients. At the same time, the device has a simple structure and multiple uses, which reduces procurement and surgical costs and has broad application prospects.

[0065] Reference Figure 1or Figure 2 In some embodiments of the present invention, the fiber coupling module 300 includes a fiber coupler 310 and a shutter 320. The fiber coupler 310 is used to couple the laser and the indicator light to generate a coupled light 350. The output end of the fiber coupler 310 is connected to the optical fiber 330, and the shutter 320 is arranged at the input end of the fiber coupler 310 or at the optical fiber 330. The optical fiber 330 is also provided with an endoscope 340, and the endoscope 340 is used to observe the coupled indicator light.

[0066] Specifically, the input end of the fiber coupler 310 is connected and coupled with the output laser and the indicator light of the laser oscillation module 100, and the laser and the indicator light are transmitted through the optical fiber 330, wherein the indicator light is visible light, which can be emitted by a helium-neon laser and a semiconductor laser; the output end of the fiber coupler 310 is connected to the light gate 320, and the light gate 320 is controlled by an external foot pedal (not shown in the figure), thereby realizing real-time light output and light blocking during the operation. The core diameter of the optical fiber 330 is 100μm-300μm, the numerical aperture is 0.18NA-0.23NA, and it is detachably connected to the fiber coupler 310. In some possible embodiments, the core diameter of the optical fiber 330 is 250μm, and the numerical aperture is 0.22NA. The endoscope 340 is used to provide real-time feedback on the surgical status in the body.

[0067] In some embodiments of the present invention, the resonant cavity includes but is not limited to a plano-planar cavity, a plano-convex cavity and an unstable cavity.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A laser medical device, characterized in that: include: A laser oscillation module (100), used for generating laser light; A mode selection module (200) is connected to the laser oscillation module (100) by signal, and is used to adjust the laser oscillation module (100) so that the laser oscillation module (100) operates in at least a continuous operation mode, a quasi-continuous operation mode, a continuous Q-switched operation mode, a quasi-continuous same-frequency Q-switched operation mode, or a quasi-continuous difference-frequency Q-switched operation mode; The optical fiber coupling module (300) is connected to the outlet of the laser oscillation module (100) and is used to couple the laser light with the indicator light.

2. The laser medical device according to claim 1, characterized in that: The laser oscillation module (100) comprises a semiconductor pump module (110) and a housing, wherein a resonant cavity is provided in the housing; A first mirror body (120), a thulium-doped gain crystal (130), an optical modulator (140), and a second mirror body (150) are sequentially arranged inside the resonant cavity, and center lines of the first mirror body (120), the thulium-doped gain crystal (130), the optical modulator (140), and the second mirror body (150) are located on the same straight line; The semiconductor pump module (110) is arranged outside the resonant cavity and located at one end of the first mirror body (120); the semiconductor pump module (110) is arranged corresponding to the end surface of the thulium-doped gain crystal (130).

3. The laser medical device according to claim 1, characterized in that: The laser oscillation module (100) comprises a semiconductor pump module (110) and a resonant cavity; A first mirror body (120), a thulium-doped gain crystal (130), an optical modulator (140), a thulium-doped gain crystal (130), and a second mirror body (150) are sequentially arranged inside the resonant cavity, and center lines of the first mirror body (120), the thulium-doped gain crystal (130), the optical modulator (140), and the second mirror body (150) are located on the same straight line; The semiconductor pump module (110) is arranged inside the resonant cavity, and the semiconductor pump module (110) is arranged on the side of the thulium-doped gain crystal (130).

4. The laser medical device according to claim 2 or 3, characterized in that: The surface of the first mirror body (120) is coated with a total reflection film for the wavelength of the 0° oscillation laser, and the reflectivity R of the total reflection film is greater than 99.5%; The surface of the second mirror body (150) is coated with a partial reflection film for the wavelength of the laser incident at an angle of 0°, and the reflectivity R of the partial reflection film is ≤90%.

5. The laser medical device according to claim 4, characterized in that: The laser oscillation module (100) further comprises a temperature controller, which is used to adjust the temperature of the semiconductor pump module (110) and the thulium-doped gain crystal (130).

6. The laser medical device according to claim 4, characterized in that: The mode selection module (200) comprises a control circuit (210) and a Q-switching driver (220); the semiconductor pump module (110), the optical modulator (140) and the Q-switching driver (220) are all connected to the control circuit (210) by signals; the control circuit (210) is used to control the working states of the semiconductor pump module (110), the optical modulator (140) and the Q-switching driver (220).

7. The laser medical device according to claim 4, characterized in that: The optical fiber coupling module (300) comprises an optical fiber coupler (310) and an optical gate (320); the optical fiber coupler (310) is used to couple the laser and the indicator light; the output end of the optical fiber coupler (310) is connected to an optical fiber (330); and the optical gate (320) is arranged at the input end of the optical fiber coupler (310) or at the optical fiber (330).

8. The laser medical device according to claim 7, characterized in that: The optical fiber (330) is also provided with an endoscope (340), and the endoscope (340) is used to observe the coupled indicator light.

9. The laser medical device according to any one of claims 5 to 8, characterized in that: The thulium-doped gain crystal (130) comprises a rod-shaped structure and a slab structure.

10. The laser medical device according to any one of claims 5 to 8, characterized in that: The resonant cavity includes a plano-planar cavity, a plano-convex cavity and an unstable cavity.

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