Fiber optic conduit and laser ablation device

Abstract

This application discloses an optical fiber conduit and a laser ablation device. By setting the input end face of the optical fiber module as an inclined plane, different laser beams emitted from the laser module are refracted into the optical fiber body from different positions on the input end face. Therefore, different laser beams undergo multiple total internal reflections at different positions within the optical fiber body, and ultimately exit from the output end along the axial direction inclined to the optical fiber body, forming annular light spots. Therefore, compared to existing technologies that require a conical structure at the output end to achieve an annular light spot, this application achieves an annular light spot simply by setting the input end as an inclined plane, eliminating the need for complex conical and protective structures at the output end. This simplifies the processing steps at the output end, controls costs, and maintains the same fiber diameter between the output end and the optical fiber body, allowing the optical fiber conduit to meet the needs of smaller diameter vein laser closure surgeries.

Description

Technical Field

[0001] This application relates to the field of medical device technology, specifically to an optical fiber catheter 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 ultimately venous wall perforation, recent advancements have focused on controlling the laser output ring-shaped spot at the lesion site. This leverages the laser's absorption of water and the photothermal effect to close the vein, resulting in better temperature control of the lesion area. This reduces or even eliminates venous wall perforation and minimizes the formation of a carbonized blood layer. However, existing laser fibers typically have a conical structure at the output end to refract the laser beam into a ring-shaped spot. To prevent the conical output end from directly inserting into the lesion and injuring the patient, please refer to [further details needed]. Figure 1 As shown, existing laser optical fibers further incorporate a glass tube protective cover at the output end of a tapered structure, which is then glued to the outer periphery of the output end. Additionally, heat-shrink tubing is used to cover the connection between the glass tube protective cover and the optical fiber. Therefore, the existing optical fiber conduit has a complex structure and a large cross-sectional area at the output end, resulting in cumbersome processing steps and high production costs. Utility Model Content

[0005] The main objective of this application is to provide an optical fiber conduit and a laser ablation device to solve the problem that the optical fiber conduit structure for forming annular light spots is relatively complex in the prior art.

[0006] On one hand, this application provides an optical fiber conduit, which includes an optical fiber module. The optical fiber module includes an optical fiber body, an input end, and an output end. The input end and the output end are located at opposite ends of the optical fiber body along the extension direction of the optical fiber body. The input end is used to allow laser light emitted by a laser source to enter the optical fiber body, and the output end is used to allow laser light passing through the optical fiber body to exit.

[0007] The end face of the input end is inclined to the plane containing the radial direction of the optical fiber body, so that the laser emitted from the output end is in a ring shape.

[0008] Furthermore, the end face of the output end is parallel to the plane containing the radial direction of the optical fiber body, so that the laser emitted from the output end is in a single ring shape;

[0009] Alternatively, the end face of the output end is spherical, so that the laser emitted from the output end is double-ringed.

[0010] Furthermore, the inclination angle α of the end face of the input end relative to the plane containing the radial direction of the optical fiber body is 10 degrees to 80 degrees.

[0011] The numerical aperture (NA) of the optical fiber body is 0.2-0.6.

[0012] Furthermore, the inclination angle α of the end face of the input end relative to the plane containing the radial direction of the optical fiber body is 10 degrees to 45 degrees.

[0013] Furthermore, the numerical aperture NA is 0.57, and the tilt angle α is 30°.

[0014] Furthermore, the end face of the output end is parallel to the plane containing the radial direction of the optical fiber body, and the optical fiber body is provided with at least one annular groove along the circumferential direction, the annular groove being close to the output end.

[0015] Furthermore, the optical fiber conduit also includes a connector for connecting the optical fiber module to the host, wherein the connector is connected to the optical fiber body and close to the input end, and the optical fiber body and the connector are not in contact between the connection point of the connector and the optical fiber body and the input end.

[0016] Furthermore, the connector is an ST connector or an SMA connector. When the fiber optic module is connected to the host via the ST connector or the SMA connector, the position of the input end relative to the laser module of the host remains unchanged.

[0017] Furthermore, the input end face is provided with an anti-reflection membrane.

[0018] On the other hand, this application also provides a laser ablation device, the laser ablation device comprising the fiber optic conduit described in any of the preceding claims; and

[0019] The host is connected to the optical fiber conduit, and the host includes a laser module and a control module. The control module is used to control the laser module to output a laser beam to the optical fiber conduit.

[0020] In the fiber optic conduit of this application, by setting the input end face of the fiber optic module as an inclined plane relative to the radial direction of the fiber optic body, the laser beam emitted by the laser module is refracted at the input end face before entering the fiber optic body. Since different laser beams enter the fiber optic body from different positions on the input end face, they undergo multiple total internal reflections at different positions within the fiber optic body, ultimately exiting from the output end along the axial direction inclined to the fiber optic body to form annular light spots. Therefore, compared to existing technologies that require a conical structure at the output end to achieve an annular laser spot, this application achieves an annular laser spot simply by setting the input end as an inclined plane. This eliminates the need for a complex conical structure at the output end and a protective structure outside the conical structure. This simplifies the processing steps at the output end and controls production costs, while maintaining the same fiber diameter between the output end and the fiber optic body, allowing the fiber optic conduit to meet the needs of smaller diameter intravenous laser closure surgeries. Attached Figure Description

[0021] 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:

[0022] Figure 1 This is a cross-sectional schematic diagram of an existing optical fiber duct, without showing the connector.

[0023] Figure 2 This is a cross-sectional schematic diagram of an embodiment of the optical fiber conduit disclosed in this application, showing the connector.

[0024] Figure 3This is a partial cross-sectional schematic diagram of an optical fiber duct with a planar output end, as disclosed in one embodiment of this application. The diagram shows a ring-shaped light spot.

[0025] Figure 4 This is a partial cross-sectional schematic diagram of an optical fiber conduit and connector with an inclined input end, as disclosed in one embodiment of this application. The diagram shows a schematic diagram of a laser beam entering the optical fiber body.

[0026] Figure 5 This is a schematic cross-sectional view of an optical fiber guide tube with a spherical output end, as disclosed in one embodiment of this application. The figure shows two annular light spots.

[0027] Figure 6 This application discloses an embodiment where the optical fiber diameter is 400 μm, the laser module power is 4W / 12W, and the running time is 5 min / 30 min. The transmission efficiency and the temperature of the optical fiber body near the input end in the connector are shown at different tilt angles.

[0028] Figure 7 This application discloses an embodiment where the optical fiber diameter is 600 μm, the laser module power is 4W / 12W, and the running time is 5 min / 30 min. The transmission efficiency and the temperature of the optical fiber body near the input end in the connector are shown at different tilt angles.

[0029] Figure 8 This is a schematic cross-sectional view of an optical fiber guide tube with a planar output end and an annular groove, as disclosed in one embodiment of this application. The figure shows two annular light spots.

[0030] Figure 9 This is a schematic cross-sectional view of an optical fiber guide tube with an anti-reflection coating at the input end, as disclosed in one embodiment of this application.

[0031] The above figures include the following reference numerals:

[0032] Fiber optic conduit 100, fiber optic body 11, input end 12, output end 13, annular groove 14, first annular spot 20, second annular spot 30, connector 40, heat dissipation space 50, anti-reflection film 60. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Please see Figure 2-3 As shown, on one hand, this application provides an optical fiber conduit 100, which is used to connect to a laser module and transmit the laser beam emitted by the laser module, so that the laser beam output from the optical fiber conduit 100 can form a ring-shaped spot that acts on the wall of the vein. Based on the thermal effect of the laser energy, the blood in the diseased vein will coagulate and the vein wall will contract, thereby achieving the purpose of closing the blood vessel and improving blood return.

[0037] Furthermore, the optical fiber conduit 100 includes an optical fiber module, which includes an optical fiber body 11, an input end 12, and an output end 13. The input end 12 and the output end 13 are located at opposite ends of the optical fiber body 11 along the extension direction of the optical fiber body 11. The input end 12 is used to allow laser light emitted by the laser source to enter the optical fiber body 11, and the output end 13 is used to allow laser light passing through the optical fiber body 11 to exit.

[0038] The end face of the input end 12 is inclined to the plane containing the radial direction of the optical fiber body 11, so that the laser beam emitted by the laser module will be refracted at the end face of the input end 12 and then enter the optical fiber body 11. Since different laser beams in the laser beam are refracted into the optical fiber body 11 from different positions on the end face of the input end 12, the different laser beams will undergo multiple total internal reflections at different positions in the optical fiber body 11, and finally be emitted from the output end 13 along the axial direction inclined to the optical fiber body 11 to form annular light spots.

[0039] Compared to existing technologies that require a conical structure at the output end 13 to produce a ring-shaped laser beam, this application achieves the same result by making the input end 12 an inclined plane. This eliminates the need for a complex conical structure at the output end 13 and a protective structure on the outside of the conical structure. This simplifies the processing steps of the output end 13 and controls production costs. It also ensures that the output end 13 has the same diameter as the fiber body 11, allowing the fiber optic conduit 100 to meet the needs of smaller diameter intravenous laser closure surgery and expanding the application range of the fiber optic conduit 100.

[0040] Please see Figure 3-4 As shown, in one embodiment, the end face of the output end 13 is parallel to the plane containing the radial direction of the optical fiber body 11, that is, the end face of the output end 13 is perpendicular to the axial direction of the optical fiber body 11, so that the end face of the output end 13 is a plane. Therefore, after the laser beam emitted by the laser module enters the optical fiber body 11 from the inclined input end 12, each laser beam will undergo multiple total internal reflections in the optical fiber body 11, and after the last total internal reflection in the optical fiber body 11 near the output end 13, it will be emitted obliquely outward from the flat end face of the output end 13, thereby forming a single ring-shaped light spot.

[0041] Furthermore, by setting the end face of the output end 13 to a plane parallel to the radial direction of the optical fiber body 11, the end face of the output end 13 only needs to be simply ground into a plane perpendicular to the axial direction of the laser body. Therefore, the flat end face of the output end 13 has the advantage of being easy to process, and will not cause puncture of the blood vessel wall before laser ablation is performed in the varicose vein.

[0042] Please see Figure 5As shown, in another embodiment, the end face of the output end 13 is spherical. Therefore, after the laser beam emitted by the laser module enters the optical fiber body 11 from the inclined input end 12, each laser beam will undergo multiple total internal reflections within the optical fiber body 11. After undergoing a final total internal reflection within the optical fiber body 11 near the output end 13, it will be emitted obliquely outward from the flat end face of the output end 13. Among them, a portion of the laser beam emitted from the output end 13 near the optical fiber body 11 will form a first annular spot 20, and another portion of the laser beam emitted from the output end 13 near the optical axis of the optical fiber body 11 will form a second annular spot 30, thereby making the laser emitted from the output end 13 double-ringed.

[0043] By setting the output end 13 as a spherical surface, the smoothness of the connection between the output end 13 and the optical fiber body 11 can be further improved, so that the optical fiber catheter 100 will not puncture the blood vessel wall before being inserted into the varicose vein for laser ablation, and the smoothness of the insertion of the optical fiber catheter 100 can also be improved.

[0044] In addition, the double-ring laser spot can preheat the target vein wall area through the first ring spot 20 which is closer to the fiber body 11, so as to cooperate with the second ring spot 30 which is farther away from the fiber body 11 from the first ring spot 20 to distribute the laser energy, thereby treating the target vein wall area more gently and efficiently.

[0045] Furthermore, the energies of the first annular light spot 20 and the second annular light spot 30 can be the same or different. Preferably, the energy ratio of the first annular light spot 20 to the second annular light spot 30 is greater than or equal to 1, such that the energy of the first annular light spot 20 is greater than or equal to the energy of the second annular light spot 30. More specifically, the energies of the first annular light spot 20 and the second annular light spot 30 can be the same, such that the energy ratio of the first annular light spot 20 to the second annular light spot 30 is 1:1.

[0046] Further, please refer to Figure 2-4As shown in Figures 6-7, in one embodiment, the inclination angle α of the end face of the input terminal 12 relative to the plane containing the radial direction of the optical fiber body 11 is 10 degrees; in another embodiment, the inclination angle α of the end face of the input terminal 12 relative to the plane containing the radial direction of the optical fiber body 11 is 80 degrees. It is understood that in other embodiments, the inclination angle α of the end face of the input terminal 12 relative to the plane containing the radial direction of the optical fiber body 11 can also be any angle between 10 degrees and 80 degrees, for example, 11.2 degrees, 13 degrees, 15 degrees, 20 degrees, 25 degrees, 32 degrees, 40 degrees, 50 degrees, 58 degrees, 70.1 degrees, 77.75 degrees, etc., which will not be listed one by one here.

[0047] It should be noted that, for the tilt angle α of the input end 12, the smaller the tilt angle α, the more laser beams can be refracted from the input end 12 and enter the optical fiber body 11, and the fewer laser beams are reflected at the input end 12. Therefore, the smaller the tilt angle α, the more effectively the proportion of the laser beam entering the optical fiber body 11 can be increased, thereby helping to improve the utilization rate of the laser beam.

[0048] Preferably, the inclination angle α of the end face of the input terminal 12 relative to the plane containing the radial direction of the optical fiber body 11 is between 10 degrees and 45 degrees. That is, in one embodiment, the inclination angle α of the end face of the input terminal 12 relative to the plane containing the radial direction of the optical fiber body 11 is 10 degrees; in another embodiment, the inclination angle α of the end face of the input terminal 12 relative to the plane containing the radial direction of the optical fiber body 11 is 45 degrees. It is understood that in other embodiments, the inclination angle α of the end face of the input terminal 12 relative to the plane containing the radial direction of the optical fiber body 11 can also be any angle between 10 degrees and 45 degrees, for example, 12.5 degrees, 17.4 degrees, 26 degrees, 35 degrees, 42 degrees, etc., which will not be listed one by one here.

[0049] Furthermore, in one embodiment, the numerical aperture NA of the optical fiber body 11 is 0.2; in another embodiment, the numerical aperture of the optical fiber body 11 is 0.6; it is understood that in other embodiments, the numerical aperture NA of the optical fiber body 11 can also be any value between 0.2 and 0.6, such as 0.21, 0.25, 0.3, 0.37, 0.45, 0.55, 0.58, etc., which will not be listed one by one here.

[0050] It should be noted that the numerical aperture NA is determined by the fiber body 11 itself, but the size of the numerical aperture NA will determine the critical angle of the fiber body 11, and the larger the numerical aperture, the larger the corresponding critical angle. Therefore, even if some laser light can be refracted into the fiber body 11, because the maximum interior angle of the laser light propagating in the fiber body 11 exceeds the critical angle of the fiber body 11, the laser light cannot undergo total internal reflection at the interface between the fiber core and cladding in the fiber body 11. Therefore, the laser light will be lost in the fiber body 11. Conversely, if the maximum interior angle of the laser light propagating in the fiber body 11 is less than the critical angle of the fiber body 11, the laser light will undergo total internal reflection at the interface between the fiber core and cladding in the fiber body 11 and will eventually be emitted from the output end 13.

[0051] Please see Figure 6-7 As shown in the figure, the transmission efficiency is illustrated when the numerical aperture NA is 0.57, the tilt angle α is 10 degrees, 20 degrees, 30 degrees, or 45 degrees, the diameter of the fiber body 11 is 400 μm or 600 μm, the power of the laser module is 4W or 12W, and the running time is 5 min or 30 min. The temperature of the fiber body 11 located within the connector 40 and near the input end 12 is also shown. By adjusting the tilt angle α of the input end 12, the first annular spot 20 and the second annular spot 30 can be emitted at different exit divergence angles, thereby adaptively targeting lesions of different morphologies and improving the treatment effect.

[0052] Furthermore, the connector 40 and the optical fiber body 11 are fixed together by adhesive. The lower the temperature of the optical fiber body 11, the better it is to maintain the adhesive bonding effect.

[0053] It should be noted that, depending on the degree of varicose veins, the power of the laser module can also be 2W, 5W, 6W, 8W, or 10W, and is not limited here.

[0054] In one embodiment, the numerical aperture NA is 0.57 and the tilt angle α is 30°. Therefore, in this embodiment, a significant portion of the laser beam emitted by the laser module can be refracted into the optical fiber body 11. After being refracted into the optical fiber body 11, the laser beam can be transmitted within the optical fiber body 11 with high transmission efficiency and finally exit from the output end 13.

[0055] Furthermore, the length of the optical fiber body 11 can be set according to the length of varicose veins in different patients. Generally, the length of the optical fiber body 11 is between 1000mm and 3000mm, and is not limited here.

[0056] Furthermore, the diameter of the optical fiber body 11 can be set according to the diameter of the varicose veins and the degree of tortuosity of the veins in the patient. Typically, the diameter of the optical fiber body 11 is between 200μm and 1000μm, and is not limited here. It can be understood that the smaller the diameter of the optical fiber body 11, the smaller the minimum bending radius of the optical fiber body 11 and the better its bending resistance.

[0057] Furthermore, the laser wavelength output from the laser module to the fiber optic module is in the infrared band, and the laser wavelength range can be a single wavelength of 1470±20nm, so as to better control the treatment temperature during the treatment of varicose veins; in addition, the laser wavelength range can also be a combination of 1470±20nm and 980±20nm, or a dual wavelength combination of 1470±20nm and 1940±20nm; among them, the wavelength combination of 1470±20nm and 980±20nm can be used in the process of treating varicose veins with a 1470±20nm wavelength laser. Based on better control of the treatment temperature, the higher energy of the 980±20nm wavelength laser is fully utilized to improve treatment efficiency; the combination of 1470±20nm and 1940±20nm wavelengths can better control the treatment temperature during the treatment of varicose veins with the 1470±20nm wavelength laser, while fully utilizing the superior water absorption capacity of the 1940±20nm wavelength laser compared to 980±20nm and 1470±20nm. This reduces the incidence of complications and the probability of blood carbonization and vessel wall perforation while requiring less energy to close varicose veins.

[0058] Further, please refer to Figure 8As shown, in one embodiment, the end face of the output end 13 is parallel to the plane containing the radial direction of the optical fiber body 11, so that the laser light emitted from the output end 13 will form a first annular spot 20. The optical fiber body 11 has at least one annular groove 14 along its circumference. The annular groove 14 can be formed by laser etching to create one or more rings. The annular groove 14 is close to the output end 13, and at least a portion of the laser light will be emitted from the annular groove 14 to form a second annular spot 30. This results in the optical fiber conduit 100 in this embodiment forming a double-ringed spot. Since more laser light will be emitted from the output end 13, the energy of the first annular spot 20 is higher than that of the second annular spot. Therefore, when performing closure treatment on the varicose veins of a patient, the second annular spot 30 can be fully utilized for preheating treatment to facilitate the distribution of laser energy in conjunction with the first annular spot 20, avoiding excessive energy concentration in the first annular spot 20, thereby providing a gentler and more efficient treatment of the target varicose vein wall area.

[0059] Furthermore, the number of annular grooves 14 can be one or more, without limitation. The depth of the annular groove 14 does not exceed 15% of the diameter of the optical fiber body 11. The annular groove 14 can be processed using laser processing. For example, while the laser acts on the surface of the optical fiber body 11, the optical fiber body 11 is rotated at a uniform speed, so that the annular groove 14 is formed after one rotation. Laser processing of the annular groove 14 is a simple stepping process and avoids the need for a transparent protective cover on the conical output end 13 to achieve multiple ring spots, which leads to a complex structure of the output end 13 and requires the use of adhesive to bond multiple cones.

[0060] Specifically, when there is only one annular groove 14, the energy ratio of the first annular light spot 20 to the second annular light spot 30 is between 6:4 and 5:5; when there are multiple annular grooves 14, the energy ratio of the first annular light spot 20 to the multiple second annular light spots 30 is approximately 7:3, and the energy of the multiple second annular light spots 30 is basically the same. It can be understood that when there are two annular grooves 14, the energy ratio of the two second annular light spots 30 is approximately 1:1; when there are three annular grooves 14, the energy ratio of the three second annular light spots 30 is approximately 1:1:1; as for the case of more than one annular groove 14, they will not be listed here.

[0061] For further information, please refer to [link / reference]. Figure 2As shown, the connector 40 is used to connect the fiber optic module to the laser module of the host, so that the laser beam emitted by the laser module can be directed towards the fiber optic module.

[0062] The connector 40 is connected to the optical fiber body 11 and close to the input end 12. The connection between the connector 40 and the optical fiber body 11 and the corresponding portion of the optical fiber body 11 and the connector 40 to the input end 12 is not in contact. This creates a heat dissipation space 50 between the portion of the optical fiber body 11 close to the input end 12 and the corresponding connector 40, thereby enabling the input end 12 to efficiently dissipate heat and reduce its temperature when receiving a laser beam.

[0063] Furthermore, the connector 40 is an ST connector 40 or an SMA connector 40. When the fiber optic module is connected to the laser module through the ST connector 40 or the SMA connector 40, the position of the input end 12 relative to the laser module remains unchanged. Since the laser beam emitted from the laser module is not a circular spot, but typically an elliptical or nearly circular irregular spot, and the energy of the spot is not uniformly distributed, and since the end face of the input end 12 is inclined, the axial rotation of the fiber optic module can affect the optimal incident area of ​​the input end 12. Therefore, using the ST connector 40 or the SMA connector 40 can fix the angle between the input end 12 and the laser module, thereby ensuring that the fiber optic module always receives the laser beam emitted by the laser module at the same angle. This ensures that the incident laser beam can fall entirely into the optimal incident area of ​​the input end 12, and that the energy of the laser beam received each time from a laser module of the same power is basically the same, thus guaranteeing the stability of the spot energy.

[0064] Further, please refer to Figure 9 As shown, the end face of the input end 12 is provided with an antireflection film 60. The antireflection film 60 is used to increase the proportion of laser light emitted by the laser module that is refracted from the end face of the input end 12 into the optical fiber body 11, thereby reducing the reflection ratio of the laser light, so that more laser light can enter the optical fiber body 11 for total internal reflection, thereby improving the utilization rate of the laser beam, and further improving the energy of the annular spot, so as to improve the treatment efficiency.

[0065] On the other hand, this application also provides a laser ablation device, which includes the fiber optic conduit 100 described in any of the above claims. Therefore, the laser ablation device possesses all the aforementioned beneficial effects, which will not be repeated here.

[0066] Furthermore, the laser ablation device also includes a main unit. The main unit is connected to the fiber optic conduit 100, and includes a laser module and a control module. The control module controls the laser module to output a laser beam to the fiber optic conduit 100, such that at least a portion of the output laser beam is refracted from the end face of the input end 12 into the fiber optic body 11, and then emitted from the output end 13 to form a ring-shaped light spot.

[0067] 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.

[0068] 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.

[0069] 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. An optical fiber duct, characterized in that, The optical fiber conduit includes an optical fiber module, which includes an optical fiber body, an input end, and an output end. The input end and the output end are located at opposite ends of the optical fiber body along the extension direction of the optical fiber body. The input end is used to allow laser light emitted by the laser source to enter the optical fiber body, and the output end is used to allow laser light passing through the optical fiber body to exit. The end face of the input end is inclined to the plane containing the radial direction of the optical fiber body, so that the laser emitted from the output end is in a ring shape.

2. The optical fiber conduit according to claim 1, characterized in that, The end face of the output end is parallel to the plane containing the radial direction of the optical fiber body, so that the laser emitted from the output end is in a single ring shape; Alternatively, the end face of the output end is spherical, so that the laser emitted from the output end is double-ringed.

3. The optical fiber conduit according to claim 2, characterized in that, The inclination angle α of the end face of the input end relative to the plane containing the radial direction of the optical fiber body is 10 degrees to 80 degrees. The numerical aperture (NA) of the optical fiber body is 0.2-0.

6.

4. The optical fiber conduit according to claim 3, characterized in that, The inclination angle α of the end face of the input end relative to the plane containing the radial direction of the optical fiber body is 10 degrees to 45 degrees.

5. The optical fiber conduit according to claim 3, characterized in that, The numerical aperture NA is 0.57, and the tilt angle α is 30°.

6. The optical fiber conduit according to claim 1, characterized in that, The end face of the output end is parallel to the plane containing the radial direction of the optical fiber body, and the optical fiber body is provided with at least one annular groove along the circumferential direction, the annular groove being close to the output end.

7. The optical fiber conduit according to claim 1, characterized in that, The fiber optic conduit also includes a connector for connecting the fiber optic module to the host, wherein the connector is connected to the fiber optic body and close to the input end, and the fiber optic body and the connector are not in contact between the connection point of the connector and the fiber optic body and the input end.

8. The optical fiber conduit according to claim 7, characterized in that, The connector is an ST connector or an SMA connector. When the fiber optic module is connected to the host via the ST connector or the SMA connector, the position of the input end relative to the laser module of the host remains unchanged.

9. The optical fiber conduit according to claim 1, characterized in that, The input end face is provided with an anti-reflection membrane.

10. A laser ablation device, characterized in that, The ablation device comprises the optical fiber conduit as described in any one of claims 1-9; and The host is connected to the optical fiber conduit, and the host includes a laser module and a control module. The control module is used to control the laser module to output a laser beam to the optical fiber conduit.

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