Optical fiber light emitting structure, optical fiber catheter and laser ablation device

Abstract

The utility model discloses an optical fiber light emitting structure, an optical fiber catheter and a laser ablation device. According to the optical fiber light emitting structure, the inner diameter of the first section is set to be larger than that of the second section, and the first section is connected to the periphery of the coating layer, so that the light-transmitting cover and the optical fiber are connected to the coating layer, and the optical fiber can be effectively protected by utilizing the coating layer, so that the structural strength of the optical fiber at the first section is improved, and the service life of the optical fiber is prolonged. The inner diameter of the second section is smaller than the inner diameter of the first section, so that the gap between the second section and the corresponding optical fiber body is small, the coaxiality is high, the assembling difficulty is reduced, the eccentricity degree of the light-transmitting cover deviating from the optical fiber is reduced, and the optical fiber quality is improved. In addition, the coaxiality of the light transmitting cover and the optical fiber is high, the annular light spots emitted from the light emitting end can be evenly and annularly emitted to the varicose vein tube wall, and therefore the treatment effect is improved.

Description

Technical Field

[0001] This application relates to the field of medical device technology, specifically to an optical fiber light output structure, an optical fiber conduit, and a laser ablation device. Background Technology

[0002] Varicose veins in the lower extremities are a common venous disease with an incidence rate as high as 10%-20%, and the incidence increases with age. Common symptoms of varicose veins include varicose veins in the lower extremities appearing as worm-like protrusions, accompanied by a feeling of soreness, heaviness, and fatigue. If left untreated, it can progress to limb edema, skin eczema, pigmentation, venous ulcers, and even thrombophlebitis, affecting the patient's work and life, and increasing their financial burden.

[0003] Traditional treatment for varicose veins involves high ligation and stripping of the great saphenous vein. This procedure requires an incision at the groin point to locate the great saphenous vein, followed by high ligation. A vein stripper is then inserted into the vessel, and the vein is stripped segmentally, with pressure bandaging applied to stop bleeding. This method is prone to postoperative complications such as subcutaneous hematoma and lower extremity edema. In recent years, endovenous laser closure (EVLA) has replaced this traditional surgical approach for varicose veins. Compared to traditional methods, EVLA avoids surgical incisions, mechanical damage, and aggressive tearing of the saphenous vein. Therefore, EVLA reduces postoperative pain, bleeding, and perivenous hematoma, while also lowering the infection rate and recanalization rate, thus promoting faster patient recovery.

[0004] To address the problem of excessively high local energy density caused by early circular laser outputs, leading to blood carbonization and subsequent vein wall perforation, and to improve energy utilization, recent research has focused on controlling the laser output to create a ring-shaped spot at the lesion site. This leverages the laser's absorption of water and the photothermal effect to close the vein, thus better controlling the temperature in the lesion area and reducing or even preventing vessel wall perforation and the formation of a carbonized blood layer. To ensure the laser refracts at the fiber optic output end to form a ring-shaped spot, the fiber's output end face is typically designed as a conical or spherical surface, not parallel to the fiber's radial direction. Therefore, to prevent the fiber from puncturing the vessel wall during its entry into the lesion, a protective shield is usually placed at the fiber's output end. Please refer to [link to relevant documentation]. Figure 1 As shown, in the prior art, the diameter of the hollow tube part in the light-transmitting cover is uniform, and the opening end of the light-transmitting cover is directly bonded to the fiber cladding with glue. This reduces the structural strength of the fiber at the bonding area, making the fiber prone to breakage at the bonding area under external force, thus affecting the service life of the fiber. Utility Model Content

[0005] The main objective of this application is to provide an optical fiber output structure, an optical fiber guide tube, and a laser ablation device to solve the problem of easy breakage at the connection between the optical fiber and the light-transmitting cover in the prior art.

[0006] On the one hand, this application provides an optical fiber output structure for laser emission, the optical fiber output structure comprising:

[0007] Optical fiber, comprising an optical fiber body, a coating layer, and a protective layer, wherein the optical fiber body has a light-emitting end, the coating layer is coated on the outer wall of the optical fiber body, and the protective layer covers the outer wall of the coating layer; and

[0008] A light-transmitting cover is disposed on the light-emitting end of the optical fiber, and the light-transmitting cover includes a first section and a second section that are interconnected, wherein the end of the first section away from the second section is the opening end of the light-transmitting cover;

[0009] Wherein, the inner diameter of the first segment is larger than the inner diameter of the second segment, and the first segment is at least partially connected to the outer periphery of the coating layer, while the second segment covers the outer periphery of the optical fiber body.

[0010] Furthermore, the inner diameter of the first segment is a constant diameter, so that the junction between the first segment and the second segment has a first end face;

[0011] The first end face, the inner wall of the first segment, the outer wall of the coating layer, and the cut surface of the protective layer are filled by an adhesive layer so that the first segment is at least partially bonded to the outer periphery of the coating layer, and the light-transmitting cover is provided on the light-emitting end of the optical fiber.

[0012] Furthermore, the inner diameter of the first segment is at least partially variable, and the inner diameter of the first segment gradually increases at least partially in the direction away from the second segment;

[0013] The inner wall of the first segment, the outer wall of the coating layer, and the cut surface of the protective layer are filled by an adhesive layer so that the first segment is at least partially bonded to the outer periphery of the coating layer, and the light-transmitting cover is provided on the light-emitting end of the optical fiber.

[0014] Furthermore, the inner diameter of the first segment gradually increases from the second segment to the opening end;

[0015] Alternatively, the first segment may include a variable diameter segment and a constant diameter segment, wherein the variable diameter segment connects the second segment and the constant diameter segment, and the inner diameter of the variable diameter segment gradually increases from the second segment to the constant diameter segment.

[0016] Furthermore, the first segment includes a first connecting sub-segment and a second connecting sub-segment, the second connecting sub-segment being connected between the first connecting sub-segment and the second segment, and the end of the first connecting sub-segment furthest from the second connecting sub-segment being the open end;

[0017] Wherein, the inner diameter of the first connecting segment is larger than the inner diameter of the second connecting segment, and the first connecting segment is at least partially connected to the outer periphery of the protective layer, and the second connecting segment is at least partially connected to the outer periphery of the coating layer.

[0018] Furthermore, the first connecting segment and the second connecting segment have a second end face, and the second connecting segment and the second segment have a third end face;

[0019] The second end face, the inner wall of the second connecting segment, the third end face, the inner wall of the first connecting segment, the outer wall of the coating layer, and the outer wall of the protective layer corresponding to the first connecting segment are filled by an adhesive layer so that the first connecting segment is bonded to the outer periphery of the protective layer, the second connecting segment is bonded to the outer periphery of the coating layer, and the light-transmitting cover is provided on the light-emitting end of the optical fiber.

[0020] Furthermore, the inner diameter of the first connecting segment is a constant diameter, and the inner diameter of the second connecting segment is a constant diameter;

[0021] Alternatively, the inner diameter of the first connecting segment is at least partially variable, and the inner diameter of the first connecting segment gradually increases at least partially from the second connecting segment to the opening end, while the inner diameter of the second connecting segment is constant.

[0022] Alternatively, the inner diameter of the first connecting segment is a constant diameter, the inner diameter of the second connecting segment is at least partially a variable diameter, and the second connecting segment gradually increases in size from the second segment to the first connecting segment in the direction of the second segment.

[0023] Alternatively, the inner diameter of the first connecting segment is at least partially variable, and the inner diameter of the first connecting segment gradually increases at least partially from the second connecting segment to the open end, and the inner diameter of the second connecting segment is at least partially variable, and the inner diameter of the second connecting segment gradually increases at least partially from the second segment to the first connecting segment.

[0024] Furthermore, the optical fiber body includes a fiber core and a quartz cladding, the quartz cladding covers the outer wall of the fiber core, the coating layer is coated on the outer wall of the quartz cladding, and the second segment is disposed on the outer periphery of the quartz cladding.

[0025] Furthermore, a limiting member is provided between the second segment and the quartz cladding, the limiting member being used to restrict the light-transmitting cover and the optical fiber to remain substantially coaxial.

[0026] On the other hand, this application also provides an optical fiber conduit, the optical fiber conduit comprising the optical fiber light output structure described in any of the preceding claims; and

[0027] A connector is disposed on the optical fiber and near the light-inlet end of the optical fiber, and the connector is used to connect the optical fiber guide tube to the laser.

[0028] Furthermore, this application also provides an ablation device, the ablation device comprising the aforementioned optical fiber conduit; and

[0029] A laser and a controller, wherein the controller is used to control the laser to output laser light to the fiber optic conduit.

[0030] In the optical fiber light-emitting structure of this application, by setting the inner diameter of the first segment of the light-transmitting cover to be larger than the inner diameter of the second segment, and by connecting the first segment at least partially to the outer periphery of the coating layer of the optical fiber, the connection position between the light-transmitting cover and the optical fiber is located at the coating layer. This allows the coating layer to effectively protect the optical fiber body located within the first segment, thereby improving the structural strength of the connection between the optical fiber and the first segment of the light-transmitting cover and reducing the risk of the optical fiber breaking at the first segment. Furthermore, by using the fact that the inner diameter of the second segment is smaller than that of the first segment, the gap between the second segment and the corresponding optical fiber body is smaller. Therefore, the second segment and the corresponding optical fiber body have a higher coaxiality, thereby reducing assembly difficulty and the degree of eccentricity of the light-transmitting cover from the optical fiber, thus reducing the risk of light falling off the optical fiber. In addition, the high coaxiality between the light-transmitting cover and the optical fiber also allows the annular light spot emitted from the light-emitting end to be evenly projected onto the wall of the varicose vein, thereby improving the treatment effect. Attached Figure Description

[0031] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0032] Figure 1 This is a cross-sectional schematic diagram of the optical fiber output structure in the prior art.

[0033] Figure 2 This is a cross-sectional schematic diagram of the optical fiber output structure in one embodiment of this application.

[0034] Figure 3 This is a cross-sectional schematic diagram of a light-transmitting cover in one embodiment of this application.

[0035] Figure 4 This is a cross-sectional schematic diagram of a light-transmitting cover in another embodiment disclosed in this application.

[0036] Figure 5 This is a cross-sectional schematic diagram of the optical fiber output structure in another embodiment of this application.

[0037] Figure 6 This is a cross-sectional schematic diagram of the light-transmitting cover in another embodiment disclosed in this application.

[0038] Figure 7 for Figure 5 A schematic diagram of point A in the middle.

[0039] The above figures include the following reference numerals:

[0040] The optical fiber output structure 100 includes an optical fiber 10, an output end 11, an optical fiber body 12, a fiber core 13, a quartz cladding 14, a coating layer 15, a protective layer 16, an input end 17, a light-transmitting cover 20, a first segment 21, a first connecting sub-segment 211, a second connecting sub-segment 212, a second segment 22, a first end face 23, a second end face 24, a third end face 25, a limiting component 30, and an adhesive layer 40. Detailed Implementation

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0043] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0044] Please see Figure 2-4 As shown, on the one hand, this application provides an optical fiber output structure 100, which is used to form a ring-shaped light spot after laser emission, so as to perform laser ablation treatment on the varicose veins of patients.

[0045] The optical fiber light-emitting structure 100 includes an optical fiber 10 and a light-transmitting cover 20. The optical fiber 10 has a light-emitting end 11, and the light-transmitting cover 20 is connected to one end of the optical fiber 10 near the light-emitting end 11 and covers the light-emitting end 11.

[0046] The optical fiber 10 includes an optical fiber body 12, a coating layer 15, and a protective layer 16. The optical fiber body 12 forms the light-emitting end 11, which has a conical or spherical structure and can be used to refract laser light outward to form a ring-shaped light spot. The coating layer 15 is coated on the outer wall of the optical fiber body 12 and is used to protect the optical fiber body 12 to strengthen its structural strength and reduce the risk of breakage under external force. The protective layer 16 covers the outer wall of the coating layer 15 and is used to further protect the optical fiber body 12 and the coating layer 15.

[0047] The light-transmitting cover 20 is disposed over the light-emitting end 11 of the optical fiber 10, and the light-transmitting cover 20 includes a first segment 21 and a second segment 22 that are interconnected. The end of the first segment 21 away from the second segment 22 is the opening end of the light-transmitting cover 20. The opening end is used to allow the optical fiber 10 to extend into the light-emitting end 11, so that the light-transmitting cover 20 can cover the end of the optical fiber 10 that is close to the light-emitting end 11.

[0048] Wherein, the inner diameter of the first segment 21 is larger than the inner diameter of the second segment 22, and the first segment 21 is at least partially connected to the outer periphery of the coating layer 15, so that the connection position between the light-transmitting cover 20 and the optical fiber 10 is located at the coating layer 15. In this way, the coating layer 15 can be fully utilized to effectively protect the optical fiber body 12 located in the first segment 21, thereby improving the structural strength of the connection between the optical fiber 10 and the first segment 21 of the light-transmitting cover 20, and reducing the risk of the optical fiber 10 breaking at the first segment 21.

[0049] Furthermore, the second segment 22 is disposed on the outer periphery of the optical fiber body 12, and the inner diameter of the second segment 22 is smaller than the inner diameter of the first segment 21, so that the gap between the second segment 22 and the corresponding optical fiber body 12 is smaller. Therefore, the second segment 22 and the corresponding optical fiber body 12 have a high degree of coaxiality, thereby reducing the assembly difficulty and the degree of eccentricity of the light-transmitting cover 20 from the optical fiber 10, thereby reducing the risk of the light falling off the optical fiber 10. In addition, the high coaxiality between the light-transmitting cover 20 and the optical fiber 10 can also make the annular light spot emitted from the light-emitting end 11 evenly circulate around the varicose vein wall, thereby improving the treatment effect.

[0050] Further, please refer to Figure 2-3 As shown, in some embodiments, the inner diameter of the first segment 21 is a constant diameter, that is, the inner diameter of any part of the first segment 21 is basically equal. Therefore, the junction of the first segment 21 and the second segment 22 has a first end face 23, which faces the first segment 21.

[0051] A filling space is formed between the first end face 23, the inner wall of the first segment 21, the outer wall of the coating layer 15, and the cut surface of the protective layer 16. This filling space is filled by an adhesive layer 40, so that the first segment 21 is at least partially bonded to the outer periphery of the coating layer 15. This allows the connection between the light-transmitting cover 20 and the optical fiber 10 to fully utilize the coating layer 15 to maintain structural strength, thereby effectively reducing the risk of the optical fiber 10 breaking at the first segment 21. Furthermore, the light-transmitting cover 20 is placed over the light-emitting end 11 of the optical fiber 10, effectively protecting the light-emitting end 11 and the portion of the optical fiber body 12 near the light-emitting end 11.

[0052] Further, please refer to Figure 4As shown, in some embodiments, the inner diameter of the first segment 21 is at least partially variable, and the inner diameter of the first segment 21 gradually increases at least partially in the direction away from the second segment 22, so that the first segment 21 can be connected to the portion of the optical fiber body 12 coated with the coating layer 15.

[0053] A filling space is formed between the inner wall of the first segment 21, the outer wall of the coating layer 15, and the cut surface of the protective layer 16. This filling space is filled by an adhesive layer 40, so that the first segment 21 is at least partially bonded to the outer periphery of the coating layer 15. This allows the connection between the light-transmitting cover 20 and the optical fiber 10 to fully utilize the coating layer 15 to maintain structural strength, thereby effectively reducing the risk of the optical fiber 10 breaking at the first segment 21. Furthermore, the light-transmitting cover 20 is placed over the light-emitting end 11 of the optical fiber 10, so that the light-transmitting cover 20 can effectively protect the light-emitting end 11 and the portion of the optical fiber body 12 near the light-emitting end 11.

[0054] Furthermore, the inner diameter of the first segment 21 gradually increases from the second segment 22 to the opening end, so that the inner diameter of the first segment 21 is entirely variable.

[0055] Alternatively, the first segment 21 may include a variable diameter segment and a constant diameter segment, wherein the variable diameter segment connects the second segment 22 and the constant diameter segment, and the inner diameter of the variable diameter segment gradually increases from the second segment 22 to the constant diameter segment, such that a portion of the inner diameter of the first segment 21 is a variable diameter and another portion is a constant diameter.

[0056] Furthermore, in some embodiments, the first segment 21 includes a first connecting segment 211 and a second connecting segment 212. The second connecting segment 212 connects the first connecting segment 211 and the second segment 22, and the end of the first connecting segment 211 away from the second connecting segment 212 is the open end.

[0057] The first connecting segment 211 is at least partially connected to the outer periphery of the protective layer 16, and the second connecting segment 212 is at least partially connected to the outer periphery of the coating layer 15. The inner diameter of the first connecting segment 211 is larger than the inner diameter of the second connecting segment 212, so that the first segment 21 is connected to the coating layer 15 and the protective layer 16 respectively. This allows the coating layer 15 and the protective layer 16 to effectively protect the optical fiber body 12 located in the first segment 21, thereby further improving the structural strength of the connection between the optical fiber 10 and the first segment 21 of the light-transmitting cover 20. This reduces the risk of the optical fiber 10 breaking at the first segment 21. Furthermore, the connection between the first connecting segment and the protective layer 16 can transfer the external force on the light-transmitting cover 20 to the protective layer 16, thereby further improving the protection effect on the optical fiber body 12 and further reducing the risk of the optical fiber body 12 breaking in the area corresponding to the first segment 21.

[0058] Further, please refer to Figure 5-6 As shown, in some embodiments, a second end face 24 is provided between the first connecting segment 211 and the second connecting segment 212, the second end face 24 facing the first connecting segment 211, and a third end face 25 is provided between the second connecting segment 212 and the second segment 22, the third end face 25 facing the second connecting segment 212.

[0059] A filling space is formed between the second end face 24, the inner wall of the second connecting segment 212, the third end face 25, the inner wall of the first connecting segment 211, the outer wall of the coating layer 15, and the outer wall of the protective layer 16 corresponding to the first connecting segment 211. This filling space is filled by an adhesive layer 40, so that the first connecting segment 211 is at least partially adhered to the outer periphery of the protective layer 16, and the second connecting segment 212 is at least partially adhered to the outer periphery of the coating layer 15. This allows the connection between the light-transmitting cover 20 and the optical fiber 10 to fully utilize the coating layer 15 and the protective layer 16 to maintain structural strength, thereby effectively reducing the risk of the optical fiber 10 breaking at the first segment 21. Furthermore, the light-transmitting cover 20 is placed over the light-emitting end 11 of the optical fiber 10, so that the light-transmitting cover 20 can effectively protect the light-emitting end 11 and the portion of the optical fiber body 12 near the light-emitting end 11.

[0060] Furthermore, in the first case, the inner diameter of the first connecting segment 211 is a constant diameter, and the inner diameter of the second connecting segment 212 is a constant diameter. Therefore, the first connecting segment 211 and the second connecting segment 212 have a second end face 24, and the second connecting segment 212 and the second segment 22 have the third end face 25.

[0061] Alternatively, in the second case, the inner diameter of the first connecting segment 211 is at least partially variable, and the inner diameter of the first connecting segment 211 gradually increases from the second connecting segment 212 to the opening end. Therefore, the first connecting segment 211 and the second connecting segment 212 may or may not have the second end face 24. The inner diameter of the second connecting segment 212 is constant, and therefore, the second connecting segment 212 and the second segment 22 have the third end face 25.

[0062] Alternatively, in a third case, the inner diameter of the first connecting segment 211 is a constant diameter, therefore, the first connecting segment 211 and the second connecting segment 212 have the second end face 24; the inner diameter of the second connecting segment 212 is at least partially variable, and the second connecting segment 212 gradually increases in size from the second segment 22 to the first connecting segment 211, therefore, the second connecting segment 212 and the second segment 22 may or may not have the third end face 25.

[0063] Alternatively, in a fourth case, the inner diameter of the first connecting segment 211 is at least partially variable, and the inner diameter of the first connecting segment 211 gradually increases from the second connecting segment 212 to the open end. Therefore, the first connecting segment 211 and the second connecting segment 212 may or may not have the second end face 24. The inner diameter of the second connecting segment 212 is at least partially variable, and the second connecting segment 212 gradually increases from the second segment 22 to the first connecting segment 211. Therefore, the second connecting segment 212 and the second segment 22 may or may not have the third end face 25.

[0064] Furthermore, the inner diameter of the second segment 22 is slightly larger than the outer diameter of the optical fiber body 12. The inner diameter of the second segment 22 may be, but is not limited to, between 0.55-0.65 mm; no specific limit is imposed here, nor will examples be provided.

[0065] The inner diameter of the first segment 21, at least the portion near the opening, is slightly larger than the outer diameter of the coating layer 15 or the outer diameter of the protective layer 16. The inner diameter of the first segment 21 at the opening may be, but is not limited to, between 0.75 mm and 0.9 mm; no specific limit is imposed, nor will examples be provided.

[0066] Furthermore, the length of the coating layer 15 exposed on the outside of the optical fiber 10 is less than or equal to the length of the optical fiber body 12 exposed on the outside of the optical fiber 10, and the length of the coating layer 15 exposed on the outside of the optical fiber 10 may be, but is not limited to, between 3.5mm and 8.5mm, and the thickness is between 0.05mm and 0.1mm. No limitation is made here, nor will examples be given one by one.

[0067] Further, please refer to Figure 2 as well as Figure 5 As shown, the optical fiber body 12 includes a fiber core 13 and a quartz cladding 14. The quartz cladding covers the outer wall of the fiber core 13 and protects the fiber core 13. The coating layer 15 is coated on the outer wall of the quartz cladding 14, and the second segment 22 is disposed on the outer periphery of the quartz cladding 14.

[0068] It should be noted that the connection between the first segment 21 and the coating layer 15, or between the first segment 21 and the coating layer 15 and the protective layer 16, can be, but is not limited to, adhesive bonding or heat fusion bonding, as long as it enables a stable connection between the light-transmitting cover 20 and the coating layer 15, or the protective layer 16, and meets medical quality requirements. No limitation is made here. The coating layer 15 can be, but is not limited to, made of acrylic resin; no limitation is made here. The protective layer 16 can be nylon; no limitation is made here. The light transmittance of the light-transmitting cover 20 is greater than or equal to 90%, preferably greater than or equal to 95%.

[0069] Further, please refer to Figure 5 as well as Figure 7 As shown, the optical fiber light output structure 100 also includes a limiting member 30. The limiting member 30 is located between the inner wall of the second section 22 of the light-transmitting cover 20 and the optical fiber body 12 of the optical fiber 10.

[0070] Furthermore, the optical fiber body 12 has a limiting position, which is located between the light-emitting end 11 and the cut surface of the coating layer 15 along the axial direction of the optical fiber 10, and the limiting position is spaced apart from the light-emitting end 11 by a certain distance. The limiting member 30 is disposed at the limiting position to restrict the light-transmitting cover 20 and the optical fiber 10 to remain substantially coaxial. The limiting member 30 is at least spaced apart from the light-emitting end 11 by a certain distance so that the limiting member 30 does not affect the formation of a ring-shaped light spot by the laser emitted from the light-emitting end 11.

[0071] By sealing the light-transmitting cover 20 to the outer periphery of the coating layer 15 or the protective layer 16 of the optical fiber 10, and by setting the limiting member 30 at the limiting position to limit the light-transmitting cover 20, the light-transmitting cover 20 and the optical fiber 10 are connected through two different positions: the limiting position and the connection position. This can improve the strength of the connection between the light-transmitting cover 20 and the optical fiber 10, so that the light-transmitting cover 20 can remain basically coaxial with the optical fiber 10. This can prevent the light-transmitting cover 20 from deviating from the axis of the optical fiber 10, which would result in insufficient connection strength between the light-transmitting cover 20 and the optical fiber 10 and cause the light-transmitting cover 20 to fall off the optical fiber 10.

[0072] In addition, it can also make the annular light spot emitted from the light-emitting end 11 evenly circulate around the varicose vein wall, thus improving the treatment effect.

[0073] Furthermore, the limiting member 30 is fused to at least one of the quartz cladding 14 and the light-transmitting cover 20, so that the limiting member 30 has good structural strength with at least one of the fused quartz cladding 14 and the light-transmitting cover 20, thereby effectively keeping the limiting member 30 in the limiting position and reducing the risk of the limiting member 30 loosening.

[0074] For the limiting member 30 to be fused with the quartz cladding 14 and the light-transmitting cover 20 respectively, the limiting member 30 can also work with the adhesive layer 40 to achieve a dual connection of the light-transmitting cover 20, thereby improving the connection strength between the light-transmitting cover 20 and the optical fiber 10, and further reducing the risk of the light-transmitting cover 20 falling off the optical fiber 10.

[0075] Furthermore, the limiting member 30 and the light-transmitting cover 20 are respectively made of quartz material, so that the limiting member 30 can be fused with the optical fiber 10 and the light-transmitting cover 20 respectively. The melting point of the limiting member 30 can be lower than that of the light-transmitting cover 20 and the quartz cladding 14, so that during the fusion process of the limiting member 30 at the limiting position with the light-transmitting cover 20 and the quartz cladding 14, when the light-transmitting cover 20 is heated externally, the limiting member 30 melts before the light-transmitting cover 20 and the quartz cladding 14; or, the melting point of the limiting member 30 is equal to that of the light-transmitting cover 20 and the quartz cladding 14, so that during the fusion process of the limiting member 30 at the limiting position with the light-transmitting cover 20 and the quartz cladding 14, when the light-transmitting cover 20 is heated externally, the limiting member 30 melts before the quartz cladding 14.

[0076] Furthermore, the limiting member 30 may be made of unfluorinated quartz material, semi-fluorinated quartz material, or fully fluorinated quartz material; no limitation is made here.

[0077] Preferably, the quartz cladding 14 and the light-transmitting cover 20 are made of unfluorinated quartz material, and the limiting member 30 is made of semi-fluorinated or fully fluorinated quartz material, so that the melting point of the limiting member 30 is lower than the melting point of the light-transmitting cover 20 and the melting point of the quartz cladding 14. This allows the limiting member 30 to be fused between the light-transmitting cover 20 and the quartz cladding 14 when the corresponding melting point is reached, without causing the quartz cladding 14 and the light-transmitting cover 20 to melt, thereby preventing deformation of the quartz cladding 14 and the light-transmitting cover 20.

[0078] Furthermore, the limiting member 30 can also be a glass tube with a low melting point. For example, the limiting member 30 can be a soda-lime glass tube mainly made of silicon dioxide, calcium oxide, and sodium oxide; or, the limiting member 30 can be a borosilicate glass tube mainly made of sodium oxide, boron oxide, and silicon dioxide; or, the limiting member 30 can be a fluoride glass tube with fluoride as the main component, such as a fluoride glass tube containing zirconium fluoride, barium fluoride, sodium fluoride, etc.; or, the limiting member 30 can be a phosphate glass tube with phosphorus pentoxide as the main component, and so on.

[0079] Furthermore, in one embodiment, the limiting member 30 is spaced a certain distance from the second connection position and the light-emitting end 11, so that the limiting member 30 will not affect the laser emission from the light-emitting end 11, and that the high temperature will not affect the softening of the adhesive layer 40 when the limiting member 30 is welded, thereby ensuring that the adhesive layer 40 maintains effective adhesion.

[0080] In another embodiment, the limiting member 30 is spaced a certain distance from the light-emitting end 11 so that the limiting member 30 does not affect the laser emission from the light-emitting end 11; the end of the limiting member 30 away from the light-emitting end 11 extends beyond the limiting position and toward the second connection position, so that the limiting member 30 can effectively fill the gap between the limiting position and the second connection position, thereby increasing the strength between the limiting position and the second connection position. The limiting member 30 is only fused with the quartz cladding 14 and the corresponding light-transmitting cover 20 at the limiting position, thereby preventing high temperatures from softening the adhesive layer 40, and thus ensuring that the adhesive layer 40 maintains effective adhesion.

[0081] Furthermore, in one embodiment, the limiting member 30 is a sleeve, which is at least sleeved at the limiting position and limited between the quartz cladding 14 and the corresponding light-transmitting cover 20, thereby limiting the light-transmitting cover 20 so that the light-transmitting cover 20 and the optical fiber 10 remain substantially coaxial.

[0082] Furthermore, the sleeve can be a heat-shrinkable sleeve, so that after the heat-shrinkable sleeve is fitted onto the outer periphery of the quartz cladding 14 at the limiting position, heating the heat-shrinkable sleeve can tightly wrap around the limiting position, thereby reducing the risk of axial movement of the heat-shrinkable sleeve on the optical fiber 10.

[0083] The sleeve can also be a metal sleeve, which can be connected to the limiting position by bonding or welding. By setting the metal sleeve, some of the heat emitted by the light-emitting end 11 can be effectively absorbed, thereby reducing the impact of the heat emitted by the light-emitting end 11 on the adhesive layer 40 and thus improving the service life of the adhesive layer 40.

[0084] The sleeve can also be other plastic sleeves besides the heat shrink sleeve, which will not be listed here.

[0085] On the other hand, please see Figure 2-7 As shown, this application also provides an optical fiber 10 conduit, which includes the optical fiber light output structure 100 described in any of the above claims; therefore, the optical fiber 10 conduit has all the above-mentioned beneficial effects, which will not be repeated here.

[0086] The fiber optic conduit 10 also includes a connector disposed on the fiber optic 10 and near the light-inlet end 17 of the fiber optic 10. The connector is used to connect the fiber optic conduit 10 to a laser, so that the laser light emitted by the laser can enter the fiber optic 10 from the light-inlet end 17 and exit from the light-outlet end 11. The light-inlet end 17 and the light-outlet end 11 are the two ends of the fiber optic 10 that are opposite each other in the axial direction.

[0087] On the other hand, please refer to Figure 2-7 As shown, this application also provides an ablation device, which includes the aforementioned optical fiber 10 conduit; therefore, the ablation device has all the aforementioned beneficial effects, which will not be repeated here.

[0088] Furthermore, the ablation device also includes a laser and a controller. The laser is connected to the connector of the fiber optic conduit 10, and the controller is used to control the laser to output laser light to the fiber optic conduit 10.

[0089] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0090] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0091] The above are merely preferred embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A light fiber light-out structure for emitting laser light, characterized by, The optical fiber output structure includes: Optical fiber, comprising an optical fiber body, a coating layer, and a protective layer, wherein the optical fiber body has a light-emitting end, the coating layer is coated on the outer wall of the optical fiber body, and the protective layer covers the outer wall of the coating layer; and A light-transmitting cover is disposed on the light-emitting end of the optical fiber, and the light-transmitting cover includes a first section and a second section that are interconnected, wherein the end of the first section away from the second section is the opening end of the light-transmitting cover; Wherein, the inner diameter of the first segment is larger than the inner diameter of the second segment, and the first segment is at least partially connected to the outer periphery of the coating layer, while the second segment covers the outer periphery of the optical fiber body.

2. The optical fiber light extraction structure of claim 1, wherein, The inner diameter of the first segment is constant, so that the junction between the first segment and the second segment has a first end face; The first end face, the inner wall of the first segment, the outer wall of the coating layer, and the cut surface of the protective layer are filled by an adhesive layer so that the first segment is at least partially bonded to the outer periphery of the coating layer, and the light-transmitting cover is provided on the light-emitting end of the optical fiber.

3. The optical fiber light extraction structure of claim 1, wherein, The inner diameter of the first segment is at least partially variable, and the inner diameter of the first segment gradually increases at least partially in the direction away from the second segment; The inner wall of the first segment, the outer wall of the coating layer, and the cut surface of the protective layer are filled by an adhesive layer so that the first segment is at least partially bonded to the outer periphery of the coating layer, and the light-transmitting cover is provided on the light-emitting end of the optical fiber.

4. The optical fiber light extraction structure of claim 3, wherein, The inner diameter of the first segment gradually increases from the second segment to the opening end; Alternatively, the first segment may include a variable diameter segment and a constant diameter segment, wherein the variable diameter segment connects the second segment and the constant diameter segment, and the inner diameter of the variable diameter segment gradually increases from the second segment to the constant diameter segment.

5. The optical fiber light extraction structure of claim 1, wherein, The first segment includes a first connecting segment and a second connecting segment, the second connecting segment being connected between the first connecting segment and the second segment, and the end of the first connecting segment away from the second connecting segment being the open end; Wherein, the inner diameter of the first connecting segment is larger than the inner diameter of the second connecting segment, and the first connecting segment is at least partially connected to the outer periphery of the protective layer, and the second connecting segment is at least partially connected to the outer periphery of the coating layer.

6. The optical fiber light extraction structure of claim 5, wherein, The first connecting segment and the second connecting segment have a second end face, and the second connecting segment and the second segment have a third end face; The second end face, the inner wall of the second connecting segment, the third end face, the inner wall of the first connecting segment, the outer wall of the coating layer, and the outer wall of the protective layer corresponding to the first connecting segment are filled by an adhesive layer so that the first connecting segment is bonded to the outer periphery of the protective layer, the second connecting segment is bonded to the outer periphery of the coating layer, and the light-transmitting cover is provided on the light-emitting end of the optical fiber.

7. The optical fiber light extraction structure of claim 5, wherein, The inner diameter of the first connecting segment is a constant diameter, and the inner diameter of the second connecting segment is a constant diameter; Alternatively, the inner diameter of the first connecting segment is at least partially variable, and the inner diameter of the first connecting segment gradually increases at least partially from the second connecting segment to the opening end, while the inner diameter of the second connecting segment is constant. Alternatively, the inner diameter of the first connecting segment is a constant diameter, the inner diameter of the second connecting segment is at least partially a variable diameter, and the second connecting segment gradually increases in size from the second segment to the first connecting segment in the direction of the second segment. Alternatively, the inner diameter of the first connecting segment is at least partially variable, and the inner diameter of the first connecting segment gradually increases at least partially from the second connecting segment to the open end, and the inner diameter of the second connecting segment is at least partially variable, and the inner diameter of the second connecting segment gradually increases at least partially from the second segment to the first connecting segment.

8. The optical fiber light extraction structure of any of claims 1-7, wherein, The optical fiber body includes a fiber core and a quartz cladding. The quartz cladding covers the outer wall of the fiber core, and the coating layer is coated on the outer wall of the quartz cladding. The second segment is disposed on the outer periphery of the quartz cladding.

9. The optical fiber light extraction structure of claim 8, wherein, A limiting member is provided between the second segment and the quartz cladding, the limiting member being used to restrict the light-transmitting cover and the optical fiber to remain substantially coaxial.

10. An optical fiber duct, characterized in that, The optical fiber conduit includes the optical fiber light output structure according to any one of claims 1-9; and A connector is disposed on the optical fiber and near the light-inlet end of the optical fiber, and the connector is used to connect the optical fiber guide tube to the laser.

11. An ablation device, characterized in that, The ablation device includes the optical fiber conduit as described in claim 10; and A laser and a controller, wherein the controller is used to control the laser to output laser light to the fiber optic conduit.

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