Optical fiber catheter and laser ablation device

Abstract

The application discloses an optical fiber catheter and a laser ablation device. In the optical fiber catheter, the input end face of the optical fiber module is arranged as an inclined surface inclined relative to the plane where the radial direction of the optical fiber body is located, and the output end is arranged in a conical shape, so that two annular light spots are synchronously output through the optical fiber catheter, and the first annular light spot is closer to the output end relative to the second annular light spot, so that the first annular light spot and the second annular light spot can effectively disperse the output laser energy, and at the same time, the first annular light spot can be used for pre-shrinking treatment on the blood vessel area needing to be closed, and then the second annular light spot is used for shrinking and closing treatment, so that the blood vessel can be ablated and closed by using more gentle laser energy, the treatment area is effectively increased, and the ablation and closing rate and the operation success rate are improved.

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 of 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 to a ring-shaped spot at the lesion site. This leverages the laser's absorption of water and the photothermal effect to close the veins, resulting in better temperature control of the lesion area. This reduces or even prevents venous wall perforation and minimizes the formation of a carbonized blood layer. However, existing fiber optic catheters typically only output a single ring of laser light. If a single treatment fails to completely close the varicose veins, a second treatment is required. Using a single ring spot for this second treatment, due to its high energy, can easily cause tissue carbonization and even nerve damage. Therefore, the existing fiber optic catheter structure requires further improvement. Utility Model Content

[0005] The main objective of this application is to provide an optical fiber catheter and a laser ablation device to solve the problem in the prior art that optical fiber catheters cannot simultaneously output at least two annular light spots to treat varicose veins at the same time.

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

[0008] Furthermore, the axis of the conical output end coincides with the central axis of the optical fiber body.

[0009] Furthermore, the inclination angle 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 angle between the shaft and the conical side of the output end is 20-37.5 degrees.

[0010] Furthermore, the tilt angle is 27 degrees and the included angle is 28.5 degrees.

[0011] Furthermore, the optical fiber body includes a first segment and a second segment, which are connected by a connector or an optical fiber patch cord. The end of the first segment furthest from the second segment is the input end, and the end of the second segment furthest from the first segment is the output end.

[0012] Furthermore, the first segment is fixedly connected to the connector, which is used to connect to the host. Alternatively, the first segment is coupled to the host, and the second segment is connected to the host via a connector, so that the second segment is connected to the first segment.

[0013] Furthermore, the numerical aperture of the first segment is less than or equal to the numerical aperture of the second segment.

[0014] Furthermore, the diameter of the first segment is less than or equal to the diameter of the second segment.

[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] Furthermore, the optical fiber body is covered with a protective cover at the output end.

[0019] 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 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 in the laser beam are refracted into the fiber optic body from different positions on the input end face, different laser beams will undergo multiple total internal reflections at different positions within the fiber optic body. When the output end is conical, a portion of the laser light refracted from the side of the conical output end near its apex will be obliquely emitted outward along the direction inclined to the central axis of the fiber optic body, forming a first annular spot. A portion of the laser light refracted from the side of the conical output end away from its apex will also be emitted outward. Another portion of the laser beam will be emitted obliquely outward along the central axis of the optical fiber body, forming a second annular spot. This allows the laser transmitted through the optical fiber conduit to simultaneously output two annular spots, with the first annular spot being closer to the output end than the second annular spot. This effectively disperses the output laser energy, allowing the first annular spot to pre-contract the blood vessel area requiring closure, followed by the second annular spot for further contraction and closure. The first and second annular spots then ablate and close the blood vessel with gentler laser energy, effectively increasing the treatment area and thus improving the ablation and closure rate and surgical success rate, while reducing the risk of patients requiring secondary treatment. 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: Figure 1 This is a cross-sectional schematic diagram of an embodiment of the optical fiber conduit disclosed in this application, showing the connector.

[0022] Figure 2 This is a schematic diagram of an optical fiber body with an integrated structure in one embodiment of the present application, showing a first annular light spot and a second annular light spot.

[0023] Figure 3 This is a schematic diagram of an optical fiber body with a segmented structure in one embodiment of the present application. The diagram shows a first annular light spot, a second annular light spot, and a central axis.

[0024] Figure 4 This is a cross-sectional view of the output end in one embodiment of this application.

[0025] Figure 5 This is a schematic diagram of the input end of the optical fiber duct in one embodiment of the present application.

[0026] Figure 6 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.

[0027] Figure 7 This is a cross-sectional schematic diagram of a protective cover provided at the output end of the optical fiber body in one embodiment of this application.

[0028] The above figures include the following reference numerals: Fiber optic conduit 100, fiber optic body 11, first segment 111, second segment 112, input end 12, output end 13, axis 131, vertex 132, center point 133, central axis 14, first annular spot 20, second annular spot 30, connector 40, heat dissipation space 50, anti-reflection film 60, protective cover 70. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] 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.

[0032] Please see Figure 1-3 As shown, 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 at least two annular light spots that act on the vein wall simultaneously and treat the vein wall sequentially. Based on the thermal effect of laser energy, the blood in the diseased vein coagulates and the vein wall contracts, thereby achieving the purpose of closing the blood vessel and improving blood return.

[0033] 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.

[0034] 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 before entering 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, different laser beams will undergo multiple total internal reflections at different positions within the optical fiber body 11. When the output end 13 is conical, a portion of the laser light refracted from the side of the conical output end 13 near its apex 132 will be obliquely emitted outward along the central axis 14 of the optical fiber body 11, forming a first annular spot 20. Another portion of the laser light refracted from the side of the conical output end 13 away from its apex 132 will be emitted along the central axis of the optical fiber body 11. The laser beam 14 is emitted obliquely outward to form a second annular spot 30, so that the laser transmitted through the fiber optic conduit 100 will simultaneously output two annular spots. The first annular spot 20 is closer to the output end 13 than the second annular spot 30. This allows the first annular spot 20 and the second annular spot 30 to effectively disperse the output laser energy. During the process of the fiber optic conduit 100 retracting to treat the lesion, the first annular spot 20 can also pre-contract the blood vessel area that needs to be closed, and then the second annular spot 30 can perform contraction and closure. In this way, the first annular spot 20 and the second annular spot 30 can ablate and close the blood vessel with a gentler laser energy, effectively increasing the treatment area, thereby improving the ablation and closure rate and the success rate of the operation, and reducing the risk of patients needing secondary treatment.

[0035] Furthermore, please refer to the following: Figure 3-4 As shown, the axis 131 of the conical output end 13 coincides with the central axis 14 of the optical fiber body 11. The axis 131 is a line passing through the center point 133 of the bottom surface of the conical output end 13. With the axis 131 coinciding with the central axis 14, the first annular light spot 20 and the second annular light spot 30 emitted from the conical output end 13 can approach a circular shape, and the energy distribution at various positions on the annulus is basically consistent. This allows both the first annular light spot 20 and the second annular light spot 30 to provide stable and gentle treatment to the inner wall of varicose veins.

[0036] Further, in one embodiment, the inclination angle 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 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 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.

[0037] It should be noted that, for the tilt angle of the input end 12, the smaller the tilt angle, 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, 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.

[0038] Preferably, the inclination angle 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 and 45 degrees. That is, in one embodiment, the inclination angle 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 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 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 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.

[0039] 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.

[0040] 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.

[0041]

[0042] Table 1

[0043] Table 2 Table 1 presents experimental data on transmission efficiency, fiber body temperature, and transmission efficiency ratios for different input tilt angles and output cone angles in one embodiment of this application, where the fiber body diameter is 400 μm, the laser module power is 4 W, and the running time is 30 min.

[0044] Table 2 presents experimental data on transmission efficiency, fiber body temperature, and transmission efficiency ratios for different input tilt angles and output cone angles in one embodiment of this application, where the fiber body diameter is 600 μm, the laser module power is 4 W, and the running time is 30 min.

[0045] Please refer to Tables 1 and 2 for the transmission efficiency when the numerical aperture (NA) is 0.57, the tilt angle 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 4 W or 12 W, and the running time is 5 min or 30 min, as well as the temperature of the fiber body 11 located within the connector 40 and near the input end 12. By adjusting the tilt angle 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.

[0046] 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.

[0047] 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.

[0048] In one embodiment, the numerical aperture NA is 0.57 and the tilt angle is 30 degrees. 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] For further information, please refer to [link / reference]. Figure 1-4As shown in Tables 1 and 2, the angle between the shaft 131 and the side of the conical output end 13 is 20-37.5 degrees. Specifically, in a cross-section passing through the shaft 131, the angle between the two side surfaces is twice the angle between the shaft 131 and the side of the conical output end 13, i.e., the angle between the two side surfaces is 40-75 degrees. This allows the laser energy transmitted by the optical fiber body 11 to pass through with higher transmission efficiency, resulting in higher laser energy ultimately acting on the lesion site, thereby improving the utilization rate of laser energy.

[0053] Furthermore, in some embodiments, the tilt angle is 27 degrees and the included angle is 28.5 degrees. Under these parameters, the average transmission efficiency of the fiber optic module is greater than 88%, and the average transmission efficiency ratio is approximately between 1:0.7 and 1:0.75. Therefore, most of the laser emitted by the laser can be transmitted by the fiber optic module and output from the output end 13 to treat varicose veins.

[0054] Furthermore, in some embodiments, please refer again to Figure 3 As shown, the optical fiber body 11 includes a first segment 111 and a second segment 112. The first segment 111 and the second segment 112 are connected by a connector 40 or an optical fiber patch cord. The end of the first segment 111 away from the second segment 112 is the input end 12, and the end of the second segment 112 away from the first segment 111 is the output end 13.

[0055] By configuring the optical fiber body 11 to consist of a first segment 111 and a second segment 112 connected together, the second segment 112 can directly use the existing optical fiber with a tapered output end 13, while the first segment 111 uses the optical fiber with a beveled input end 12. This avoids the high processing difficulty caused by the need for high-precision polishing of the input end 12 and output end 13 separately for the integrated optical fiber body 11, and the problem of not being able to quickly replace the output end 13 because it needs to be cleaned after each treatment before it can be reused. Therefore, by configuring the first segment 111 and the second segment 112, the processing difficulty of the optical fiber module can be reduced, and the second segment 112 can be quickly replaced to reuse the first segment 111 and make the optical fiber module that has been replaced with the second segment 112 usable directly.

[0056] Furthermore, in one embodiment, please refer again to Figure 1 as well as Figure 5As shown, the first segment 111 is fixedly connected to the connector 40, which is used to connect to the host. This ensures that the first segment 111 and the connector 40 maintain a relative position, thereby allowing the input end 12 located on the first segment 111 to maintain a relative position with the host. This ensures that the laser output by the host is refracted into the first segment 111 from the same area on the input end 12 each time. This allows the laser to be transmitted to the second segment 112 with a stable transmission efficiency, and output from the output end 13 of the second segment 112 to form the first annular spot 20 and the second annular spot 30.

[0057] Alternatively, in another embodiment, the first segment 111 is coupled to the host. Therefore, the first segment 111 remains relatively stationary with respect to the host and is fixed to the host. This avoids the need to adjust the relative angle between the input end 12 and the host every time the fiber optic module is connected to the host. Thus, after adjusting the angle of the input end 12 relative to the host for the first time, the desired two ring-shaped light spots output from the output end 13 can be obtained.

[0058] The second segment 112 is connected to the host via connector 40, so that the second segment 112 is connected to the first segment 111, thereby enabling the laser energy transmitted by the first segment 111 to continue to be transmitted through the second segment 112 and output from the output terminal 13 on the second segment 112.

[0059] Furthermore, in the embodiments of this application, the numerical aperture of the first segment 111 is less than or equal to the numerical aperture of the second segment 112, so that the laser emitted from the first segment 111 toward the second segment 112 can enter the second segment 112 and undergo total internal reflection within the second segment 112, thereby ensuring that the laser emitted from the output end 13 of the second segment 112 can form the first annular spot 20 and the second annular spot 30.

[0060] Furthermore, in the embodiments of this application, the diameter of the first segment 111 is less than or equal to the diameter of the second segment 112, thereby preventing the laser emitted from the first segment 111 from leaking at the connection between the first segment 111 and the second segment 112, thus ensuring that all the laser transmitted by the first segment 111 can enter the second segment 112, thereby ensuring the transmission efficiency of the optical fiber.

[0061] Furthermore, 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] Please refer to the following: Figure 1 as well as Figure 5 As shown, 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 between 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 when receiving a laser beam and reduce the temperature of the input end 12.

[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 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] For further information, please refer to [link / reference]. Figure 1 as well as Figure 6 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] For further information, please refer to [link / reference]. Figure 7As shown, in some embodiments, the optical fiber body 11 is covered with a protective cover 70 at the output end 13. The protective cover 70 is used to protect the output end 13 to prevent the output end 13 from being damaged by collision, and to prevent the output end 13 from puncturing the patient during the process of entering the lesion site. In addition, by setting the protective cover 70, carbides can also be prevented from adhering to the output end 13 during the ablation process.

[0066] On the other hand, please see Figure 1-7 As shown, 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.

[0067] 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 the first annular spot 20 and the second annular spot 30.

[0068] 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.

[0069] 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.

[0070] 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 input end face is inclined to the plane containing the radial direction of the optical fiber body, and the output end is conical so that the laser emitted from the output end is in a double-ring shape.

2. The optical fiber conduit according to claim 1, characterized in that, The axis of the conical output end coincides with the central axis of the optical fiber body.

3. The optical fiber conduit according to claim 2, characterized in that, The inclination angle 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 angle between the shaft and the conical side of the output end is 20-37.5 degrees.

4. The optical fiber conduit according to claim 3, characterized in that, The tilt angle is 27 degrees and the included angle is 28.5 degrees.

5. The optical fiber conduit according to claim 1, characterized in that, The optical fiber body includes a first segment and a second segment, which are connected by a connector or an optical fiber patch cord. The end of the first segment away from the second segment is the input end, and the end of the second segment away from the first segment is the output end.

6. The optical fiber conduit according to claim 5, characterized in that, The first segment is fixedly connected to the connector, which is used to connect to the host. Alternatively, the first segment is coupled to the host, and the second segment is connected to the host via a connector, so that the second segment is connected to the first segment.

7. The optical fiber conduit according to claim 5, characterized in that, The numerical aperture of the first segment is less than or equal to the numerical aperture of the second segment.

8. The optical fiber conduit according to claim 5, characterized in that, The diameter of the first segment is less than or equal to the diameter of the second segment.

9. 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.

10. The optical fiber conduit according to claim 9, 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.

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

12. The optical fiber conduit according to claim 1, characterized in that, The optical fiber body is covered with a protective cover at the output end.

13. A laser ablation device, characterized in that, The laser ablation device includes the fiber optic conduit as described in any one of claims 1-12; 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.

Images