Renal artery laser ablation catheter

Abstract

The utility model discloses a renal artery laser ablation catheter which comprises a catheter structure and an optical fiber bundle. The tube structure has a fiber channel; the optical fiber bundle is contained in the optical fiber channel and comprises a plurality of first optical fibers with the fiber core diameter smaller than 200 micrometers, and the first optical fibers are used for transmitting first laser for irradiating sympathetic nerves and arranged in the extending direction of the optical fiber channel. The diameter of the fiber core of the first optical fiber is set to be smaller than 200 micrometers, so that the first optical fiber has good flexibility, compared with an optical fiber with a large core diameter, the first optical fiber is more suitable for being applied to the renal artery laser ablation catheter, the renal artery laser ablation catheter can freely penetrate through the renal artery, power consumption is small, and light transmission efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a renal artery laser ablation catheter. Background Art

[0002] Due to factors such as an aging population and unhealthy lifestyles, the prevalence of hypertension is on the rise. It is estimated that the total number of hypertensive patients in China will reach more than 250 million, and the hypertension control rate in adults is about 15%.

[0003] Treatments for hypertension include medication, lifestyle intervention, and interventional therapy. Medication is difficult to treat refractory hypertension, and patients generally have poor compliance with medication. Renal artery denervation (RDN) is the most widely studied and clinically evidenced interventional therapy for hypertension. Its purpose is to block signal conduction between the brain and the sympathetic nerves, reduce the overactive sympathetic nerves in patients with hypertension, and thus play a hypotensive role. At present, RDN mainly uses radiofrequency energy, ultrasonic energy, cryoenergy, and chemicals to irradiate or inject the sympathetic nerve fibers located on the adventitia of the renal artery, which has a certain effect on the sympathetic nerve fibers, such as a certain degree of damage, thereby causing a decrease in the level of systemic sympathetic nerve excitement, and then causing a decrease in arterial blood pressure. It mainly includes three categories: renal artery radiofrequency ablation, renal artery ultrasonic ablation, and renal artery local injection of chemical drugs ablation. Laser energy is rarely used for sympathetic nerve irradiation. In the related arteries, the renal artery laser ablation catheter uses a single large-core optical fiber for laser transmission. Since the bending radius of the large-core optical fiber is too large, it is difficult for it to pass freely when applied to the left and right renal arteries that have a large angle bend with the aorta. Utility Model Content

[0004] The utility model aims to provide a renal artery laser ablation catheter, which aims to solve the technical problem that a single large-core optical fiber is not easily applied to renal artery laser.

[0005] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is as follows: a renal artery laser ablation catheter, comprising:

[0006] a tube structure having an optical fiber channel;

[0007] An optical fiber bundle is accommodated in the optical fiber channel, the optical fiber bundle includes a plurality of first optical fibers with a core diameter less than 200um, the first optical fibers are used to transmit a first laser for irradiating the sympathetic nerves, and the first optical fibers are placed in the extension direction of the optical fiber channel.

[0008] As an embodiment, the bending radius of the first optical fiber is less than 10 mm; and / or,

[0009] The first optical fiber is a multimode optical fiber.

[0010] As an embodiment, the optical fiber bundle also includes a second optical fiber, which is used to transmit a second laser for sensing the temperature of the target site and generating a central reflection wavelength. The second optical fiber is placed in the multiple first optical fibers and is accommodated in the optical fiber channel together with the first optical fibers.

[0011] As an embodiment, the bending radius of the second optical fiber is greater than or equal to 10 mm and less than or equal to 25 mm; and / or,

[0012] The core diameter of the second optical fiber is greater than or equal to 8 um and less than or equal to 12 um.

[0013] As an implementation manner, the second optical fiber is a single-mode optical fiber or a multi-mode optical fiber.

[0014] As an embodiment, the output end of the optical fiber bundle is located at the distal end of the tube structure, and has an inclined surface that is angled with the extended axis of the tube structure; the inclined surface is set at an angle with the central axis of the laser ablation catheter, and the angle is greater than or equal to 20° and less than or equal to 40°.

[0015] As an embodiment, the output end of the optical fiber bundle is located at the distal end of the tube structure, and has a tapered tip or a tapered groove with a tapered angle greater than or equal to 30° and less than or equal to 80°.

[0016] As an embodiment, the laser ablation catheter further comprises a balloon assembly, and the balloon assembly is sealingly sleeved on the distal end of the tube structure, so that the distal ends of the tube structure and the optical fiber bundle are disposed inside the balloon assembly.

[0017] As an embodiment, the balloon assembly includes a first balloon, and the first balloon is sealed and sleeved on the distal end of the tube structure, so that the distal ends of the tube structure and the optical fiber bundle are arranged in the first balloon; or,

[0018] The balloon assembly includes a second balloon, and the second balloon is sealed and sleeved on the distal end of the optical fiber bundle, so that the tube structure and the distal end of the optical fiber bundle are arranged in the second balloon; or,

[0019] The balloon assembly includes a first balloon and a second balloon, the first balloon and the second balloon are both sealed and sleeved on the distal end of the optical fiber bundle, the second balloon is sleeved on the periphery of the first balloon, and the tube structure and the distal end of the optical fiber bundle are arranged in the first balloon.

[0020] As an embodiment, the tube structure includes an inner tube and an outer tube;

[0021] The outer tube is sleeved on the periphery of the inner tube, and is eccentrically arranged with the inner tube to enclose and form a first optical fiber placement channel, and the first optical fiber is arranged in the first optical fiber placement channel; the inner tube has a second optical fiber placement channel, and the second optical fiber is arranged in the second optical fiber placement channel;

[0022] The optical fiber channel includes the first optical fiber placement channel and the second optical fiber placement channel.

[0023] The renal artery laser ablation catheter provided by the utility model sets the core diameter of the first optical fiber to be less than 200um, and the core diameter of a single first optical fiber is small, and its bending radius is correspondingly reduced. The smaller the bending radius, the greater the flexibility of the optical fiber. In this way, the first optical fiber can have better flexibility, so that the renal artery laser ablation catheter can easily enter the left and right renal arteries that have a large angle bend with the aorta, and pass freely in the renal artery, with low power loss and high light transmission efficiency. Compared with large core diameter optical fibers, it is more suitable for use in renal artery laser ablation catheters. In addition, since the core diameter of a single first optical fiber is small, a plurality of first optical fibers can be set in the optical fiber bundle to ensure the size of the laser energy released by the optical fiber bundle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1 It is a front view of the renal artery laser ablation catheter provided in the first embodiment of the utility model;

[0026] Figure 2 yes Figure 1 A schematic structural diagram of the distal end of a renal artery laser ablation catheter is shown;

[0027] Figure 3 yes Figure 1 Left view of the renal artery laser ablation catheter shown;

[0028] Figure 4 It is a front view of the renal artery laser ablation catheter provided by the second embodiment of the utility model;

[0029] Figure 5 It is a front view of the renal artery laser ablation catheter provided in the third embodiment of the present invention.

[0030] Description of Figure Numbers:

[0031] 100. renal artery laser ablation catheter; 10. optical fiber bundle; 11. first optical fiber; 12. second optical fiber; 13. tapered tip; 14. tapered groove; 15. inclined surface; 20. tube structure; 21. optical fiber channel; 211. first optical fiber placement channel; 212. second optical fiber placement channel; 213. third optical fiber placement channel; 23. outer tube; 24. inner tube; 25. outer sleeve; 30. balloon assembly; 31. first balloon; 32. second balloon; 40. guide wire.

[0032] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0035] In the field of medical device technology, the direction close to the operator is usually defined as the proximal end, the direction away from the operator is defined as the distal end, the radial direction refers to the direction along the diameter or radius, the axial direction refers to the direction along the central axis, the radial direction and the axial direction are perpendicular to each other, and the circumferential direction refers to the circumferential direction around the central axis. Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those commonly understood by technicians in the technical field of the present invention. The customary terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not to be understood as limitations of the present invention.

[0036] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0037] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0038] Embodiment 1:

[0039] like Figure 1 and Figure 2 As shown, the renal artery laser ablation catheter 100 provided by the embodiment of the utility model comprises an optical fiber bundle 10 and a tube structure 20; the tube structure 20 has an optical fiber channel 21; the optical fiber bundle 10 comprises a plurality of first optical fibers 11 with a core diameter less than 200um, the first optical fibers 11 are used to transmit a first laser for irradiating the sympathetic nerves, and the first optical fibers 11 are placed in the extension direction of the optical fiber channel 21. In a specific application, the receiving end (i.e., the proximal end) of the first optical fiber 11 receives the first laser, which is transmitted to the output end (i.e., the distal end) and then released toward the sympathetic nerve fibers on the adventitia of the renal artery, thereby irradiating the sympathetic nerve fibers. The first laser can be transmitted continuously or in pulsed form.

[0040] The above technical solution is adopted, by setting a tube structure 20, the tube structure 20 has an optical fiber channel 21, the optical fiber bundle 10 is accommodated in the optical fiber channel 21, the tube structure 20 plays a role of protecting and binding the optical fiber bundle 10, preventing the optical fiber bundle 10 from being damaged by foreign objects, and improving the aggregation of the optical fiber bundle 10; by setting a first optical fiber 11, the first optical fiber 11 can transmit a first laser, so that the renal artery laser ablation catheter 100 can use the laser to damage the sympathetic nerve fibers located on the outer membrane of the renal artery to a certain extent, so as to realize the use of laser energy for RDN By setting the core diameter of the first optical fiber 11 to be less than 200um, the core diameter of a single first optical fiber 11 is small, and its bending radius is correspondingly reduced. The smaller the bending radius, the greater the flexibility of the optical fiber. In this way, the first optical fiber 11 can have better flexibility, so that the renal artery laser ablation catheter 100 can easily enter the left and right renal arteries that have a large angle bend with the aorta, and freely pass through the renal artery, with low power loss and high light transmission efficiency. Compared with large core diameter optical fibers, it is more suitable for use in renal artery laser ablation catheters 100. In addition, since the core diameter of a single first optical fiber 11 is small, multiple first optical fibers 11 can be set in the optical fiber bundle 10 to ensure the laser energy released by the optical fiber bundle 10.

[0041] As an embodiment, the bending radius of the first optical fiber 11 is less than 10 mm. The smaller the bending radius, the greater the flexibility of the optical fiber. By setting the bending radius of the first optical fiber 11 to be less than 10 mm, the first optical fiber 11 has better flexibility, so that the laser ablation catheter can easily pass from the arterial trunk to the left and right renal arteries. Specifically, the bending radius of the first optical fiber 11 can be 9 mm, 8 mm, 7 mm, 6 mm, etc.

[0042] As an implementation mode, the first optical fiber 11 is a multimode optical fiber, which can transmit multiple modes at a certain working wavelength.

[0043] As an implementation manner, the core numerical aperture of the first optical fiber 11 is greater than or equal to 0.22 and less than or equal to 0.5. In specific applications, the first optical fiber 11 with a corresponding core numerical aperture can be selected according to actual conditions.

[0044] Exemplarily, the first optical fiber 11 is a quartz optical fiber, including a core, a cladding and a coating layer, wherein the cladding is wrapped around the core, and the coating layer is coated on the outside of the cladding. The coating layer contains polyimide and acrylate materials, which greatly improves the high temperature resistance of the coating layer; the cladding is a polymer material, which can be applied to relatively low laser power and near-infrared wavelengths.

[0045] As an implementation mode, the optical fiber bundle 10 includes at least seven first optical fibers 11. In this way, the laser energy released by the optical fiber bundle 10 is guaranteed.

[0046] See also Figure 2 , the optical fiber bundle 10 also includes a second optical fiber 12, which is used to transmit a second laser that senses the temperature of the target part and generates a central reflection wavelength. The second optical fiber 12 is placed in the plurality of first optical fibers 11 and is contained in the optical fiber channel 21 at the same time as the first optical fiber 11. In a specific application, the control unit emits a second laser, and the second optical fiber 12 transmits the second laser to the output end (i.e., the far end). According to the effect of the second optical fiber 12, the second optical fiber 12 reflects the central reflection wave to the sensor analyzer. The control unit can judge the temperature of the target part according to the wavelength of the central reflection wave, and the second optical fiber 12 acts as a temperature sensor. In this way, when the sympathetic nerve fibers on the adventitia of the renal artery are laser irradiated, the temperature of the target part can be monitored in real time to avoid excessively high or low temperatures, thereby improving the stability and safety of laser irradiation. Of course, in other embodiments, it is also possible that the optical fiber bundle 10 is not provided with the second optical fiber 12. Among them, the target part refers to the part to be laser irradiated.

[0047] As an embodiment, the bending radius of the second optical fiber 12 is greater than or equal to 10 mm and less than or equal to 25 mm; the core diameter of the second optical fiber 12 is greater than or equal to 8 um and less than or equal to 12 um. This configuration makes the second optical fiber 12 have a certain degree of flexibility, so that the optical fiber bundle 10 can pass through blood vessels with various curvatures.

[0048] As an implementation, the second optical fiber 12 is a single-mode optical fiber. Of course, in other embodiments, the second optical fiber 12 may also be a multi-mode optical fiber.

[0049] As an implementation, the second optical fiber 12 is provided with one or more groups of fiber Bragg gratings. In this embodiment, the second optical fiber 12 is provided with one group of fiber Bragg gratings. In specific applications, the number of fiber Bragg gratings can be set according to actual needs, and the number of fiber Bragg gratings is not limited here.

[0050] In this embodiment, the second optical fiber 12 is used as a temperature sensor to sense the temperature of the far end of the optical fiber bundle 10 at the target location. Furthermore, the second optical fiber 12 can be configured as a resistance temperature device or a thermocouple or other temperature sensing device, wherein the temperature measurement accuracy is + / -0.1°C.

[0051] As an embodiment, the optical fiber bundle 10 includes one second optical fiber 12. It is understood that in other embodiments, the optical fiber bundle 10 may include two, three, or four second optical fibers 12. Here, the number of the second optical fibers 12 is not limited.

[0052] See also Figure 1 and Figure 3 , the output end of the optical fiber bundle 10 is located at the distal end of the tube structure 20, and has an inclined surface 15 that is at an angle to the extended axis of the tube structure 20, and the inclined surface 15 is set at an angle to the central axis of the renal artery laser ablation catheter 100. Preferably, the angle between the inclined surface 15 and the central axis of the renal artery laser ablation catheter 100 is greater than or equal to 20° and less than or equal to 40°. Among them, the output end of the optical fiber bundle 10 is the output end of the first optical fiber 11 and the output end of the second optical fiber 12. The output end of the optical fiber bundle 10 releases laser energy, and the inclined surface 15 is set at the output end so that the optical fiber bundle 10 releases laser energy in one direction. The directionality of the released laser energy is stronger, and the laser energy of the optical fiber bundle 10 is concentrated in the same direction, which greatly increases the intensity of the laser energy and avoids the occurrence of insufficient laser energy. Among them, Figure 1 The arrows indicate the direction of laser energy release.

[0053] See also Figure 1 and Figure 3The tube structure 20 includes an outer tube 23 and an inner tube 24. The outer tube 23 is sleeved on the periphery of the inner tube 24 and is eccentrically arranged with the inner tube 24 and encloses a first optical fiber placement channel 211. The first optical fiber 11 is arranged in the first optical fiber placement channel 211; the inner tube 24 has a second optical fiber placement channel 212, and the second optical fiber 12 is arranged in the second optical fiber placement channel 212; the optical fiber channel 21 includes the first optical fiber placement channel 211 and the second optical fiber placement channel 212. Among them, the cavity of the inner tube 24 forms the second optical fiber placement channel 212. By placing the second optical fiber 12 in the second optical fiber placement channel 212, compared with placing the first optical fiber 11 and the second optical fiber 12 in the same optical fiber placement channel (due to the different radial sizes of the first optical fiber 11 and the second optical fiber 12, it is difficult to install and the concentration of the optical fibers is not high), the installation is faster and more convenient. In this embodiment, the first optical fiber 11 and the second optical fiber 12 are fixed in the optical fiber channel 21 by an adhesive. Of course, in a specific application, as an alternative implementation, the second optical fiber 12 can be located in the first optical fiber placement channel 211 .

[0054] In this embodiment, the outer tube 23 and the inner tube 24 are eccentrically arranged, wherein the outer tube 23 and the inner tube 24 are both cylindrical, and the two are eccentrically arranged, that is, the central axis of the outer tube 23 deviates from the central axis of the inner tube 24, and the radial dimension of a part of the area of ​​the first optical fiber placement channel 211 formed is greater than the radial dimension of another part of the area. After a plurality of first optical fibers 11 are placed in the first optical fiber placement channel 211, the first optical fibers 11 can be arranged in a crescent shape or a structure similar to a crescent shape. In this way, the laser released from the output end of the first optical fiber 11 is more concentrated and more directional, which is conducive to increasing the intensity of the laser energy in the same direction, that is, increasing the intensity of the laser energy irradiated to the sympathetic nerves in the target area. Preferably, the inner tube 24 is arranged inwardly of the outer tube 23, and the cross-section of the first optical fiber placement channel 211 formed is crescent-shaped. After a plurality of first optical fibers 11 are placed in the first optical fiber placement channel 211, they are arranged in a crescent shape.

[0055] See also Figure 2 and Figure 3 The tube structure 20 further includes an outer tube 25, which is disposed at the proximal end of the tube structure 20, and the outer tube 23 and the inner tube 24 are disposed at the distal end of the tube structure 20. The input ends of the first optical fiber 11 and the second optical fiber 12 are both accommodated in the outer tube 25, and the output end of the first optical fiber 11 is disposed in the first optical fiber placement channel 211, and the output end of the second optical fiber 12 is disposed in the second optical fiber placement channel 212. Specifically, the cavity of the outer tube 25 forms a third optical fiber placement channel 213, and the third optical fiber placement channel 213 communicates with the first optical fiber placement channel 211 and the second optical fiber placement channel 212, and the proximal ends of the first optical fiber 11 and the second optical fiber 12 are both accommodated in the third optical fiber placement channel 213.

[0056] In this embodiment, at the proximal end of the tube structure 20, the second optical fiber 12 is disposed in the middle of the optical fiber bundle 10, that is, the plurality of first optical fibers 11 are arranged around the second optical fiber 12 with the second optical fiber 12 as the center. It is understood that in other embodiments, the second optical fiber 12 may be disposed in other parts of the optical fiber bundle 10, such as a part away from the center of the optical fiber bundle 10.

[0057] See also Figure 1 The laser ablation catheter further comprises a balloon assembly 30 , which is sealingly sleeved on the distal ends of the optical fiber bundle 10 and the tube structure 20 , so that the distal end of the optical fiber bundle 10 is disposed inside the balloon assembly 30 .

[0058] See also Figure 1 The balloon assembly 30 includes a first balloon 31 and a second balloon 32, both of which are sealed and sleeved on the distal end of the optical fiber bundle 10, and the second balloon 32 is sleeved on the periphery of the first balloon 31. The tube structure 20 and the distal end of the optical fiber bundle 10 are arranged in the first balloon 31, that is, the inclined surface 15 of the distal end of the optical fiber bundle 10 is arranged in the first balloon 31. Specifically, the first balloon 31 and the second balloon 32 are both sealed and sleeved on the distal end of the tube structure 20.

[0059] The tube structure 20 is also provided with a first liquid guiding channel and a second liquid guiding channel. The first liquid guiding channel is connected to the first balloon 31 and is at least used to convey the first liquid to the first balloon 31. The second liquid guiding channel is connected to the second balloon 32 and is at least used to convey the second liquid to the second balloon 32. The first liquid can be a cooling liquid, such as cooling water. The cooling liquid is input into the first balloon 31 through the first liquid guiding channel, and the distal end of the optical fiber bundle 10 can be cooled to avoid damage to the optical fiber bundle 10 due to excessive temperature during laser irradiation. In a specific application, after the cooling liquid is input into the first balloon 31 through the first liquid guiding channel, it absorbs the heat at the distal end of the optical fiber bundle 10 and is then output from the first liquid guiding channel. The second liquid can be a radiation-proof solution or physiological saline, etc. The second liquid is input into the second balloon 32 through the second liquid delivery channel, and then the second balloon 32 is expanded by pressurizing the second liquid inside the second balloon 32, so that the second balloon 32 can be close to the inner wall of the renal artery, thereby positioning the renal artery laser ablation catheter 100 and improving the stability of the renal artery laser ablation catheter 100 during laser irradiation.

[0060] It is understood that in other embodiments, the balloon assembly 30 includes a first balloon 31, which is sealed and sleeved on the distal end of the optical fiber bundle 10, so that the distal ends of the tube structure 20 and the optical fiber bundle 10 are disposed in the first balloon 31; or, the balloon assembly 30 includes a second balloon 32, which is sealed and sleeved on the distal end of the optical fiber bundle 10, so that the distal ends of the tube structure 20 and the optical fiber bundle 10 are disposed in the second balloon 32. When the balloon assembly 30 includes the second balloon 32, the distal end of the optical fiber bundle 10 can also pass through the second balloon 32 and extend to the outside of the second balloon 32.

[0061] As an implementation manner, both the first balloon 31 and the second balloon 32 may be connected to the tube structure 20 by heat-melt welding or laser welding to ensure the reliability of the connection.

[0062] See also Figure 1 and Figure 3 The renal artery laser ablation catheter 100 further includes a guide wire 40 , which is passed through the second optical fiber placement channel 212 . By controlling the guide wire 40 , the distal end of the tube structure 20 can be guided to reach the target site of the renal artery.

[0063] Embodiment 2:

[0064] See also Figure 1 and Figure 4 The difference between the renal artery laser ablation catheter 100 provided in this embodiment and that in the first embodiment lies in the different structure of the distal end of the optical fiber bundle 10, which is specifically reflected in that: in the first embodiment, the distal end of the optical fiber bundle 10 has an inclined surface 15; while in this embodiment, the distal end of the optical fiber bundle 10 has a tapered tip 13.

[0065] See also Figure 4 , the distal end of the optical fiber bundle 10 has a conical tip 13. In this way, the optical fiber bundle 10 releases the first laser along its circumference, and the first laser can cover the renal artery 360°, greatly improving the operating efficiency of the RDN procedure. Of course, in specific applications, the distal end of the optical fiber bundle 10 can also have a tip of other shapes, such as a truncated cone.

[0066] As an embodiment, the cone angle of the conical tip 13 is greater than or equal to 30° and less than or equal to 80°. Specifically, the cone angle can be 30°, 50°, 60°, 70°, 80°, etc.

[0067] In addition to the above differences, the renal artery laser ablation catheter 100 provided in this embodiment can be designed with reference to the first embodiment, and will not be described in detail here.

[0068] Embodiment three:

[0069] See also Figure 1 and Figure 5The difference between the renal artery laser ablation catheter 100 provided in this embodiment and that in the first embodiment is that the structure of the distal end of the optical fiber bundle 10 is different, which is specifically reflected in that: in the first embodiment, the distal end of the optical fiber bundle 10 has an inclined surface 15; while in this embodiment, the distal end of the optical fiber bundle 10 has a conical groove 14.

[0070] By providing the tapered groove 14 at the distal end of the optical fiber bundle 10 , the optical fiber bundle 10 can release the first laser along its circumference, and the first laser can cover the renal artery blood vessel 360°.

[0071] As an embodiment, the cone angle of the conical groove 14 is greater than or equal to 30° and less than or equal to 80°. Specifically, the cone angle can be 30°, 50°, 60°, 70°, 80°, etc.

[0072] In addition to the above differences, the renal artery laser ablation catheter 100 provided in this embodiment can be designed with reference to the first embodiment, and will not be described in detail here.

[0073] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A renal artery laser ablation catheter, characterized in that: include: a tube structure having an optical fiber channel; An optical fiber bundle is accommodated in the optical fiber channel, the optical fiber bundle includes a plurality of first optical fibers with a core diameter less than 200um, the first optical fibers are used to transmit a first laser for irradiating the sympathetic nerves, and the first optical fibers are placed in the extension direction of the optical fiber channel.

2. The renal artery laser ablation catheter according to claim 1, characterized in that: The bending radius of the first optical fiber is less than 10 mm; and / or, The first optical fiber is a multimode optical fiber.

3. The renal artery laser ablation catheter according to claim 1 or 2, characterized in that: The optical fiber bundle also includes a second optical fiber for transmitting a second laser for temperature sensing of a target site and generating a central reflection wavelength. The second optical fiber is disposed in the plurality of first optical fibers and is accommodated in the optical fiber channel together with the first optical fibers.

4. The renal artery laser ablation catheter according to claim 3, characterized in that: The bending radius of the second optical fiber is greater than or equal to 10 mm and less than or equal to 25 mm; and / or, The core diameter of the second optical fiber is greater than or equal to 8 um and less than or equal to 12 um.

5. The renal artery laser ablation catheter according to claim 3, characterized in that: The second optical fiber is a single-mode optical fiber or a multi-mode optical fiber.

6. The renal artery laser ablation catheter according to claim 1 or 2, characterized in that: The output end of the optical fiber bundle is located at the distal end of the tube structure and has an inclined surface that is angled with the extended axis of the tube structure; the inclined surface is set at an angle with the central axis of the laser ablation catheter, and the angle is greater than or equal to 20° and less than or equal to 40°.

7. The renal artery laser ablation catheter according to claim 1 or 2, characterized in that: The output end of the optical fiber bundle is located at the distal end of the tube structure, and has a tapered tip or a tapered groove with a tapered angle greater than or equal to 30° and less than or equal to 80°.

8. The renal artery laser ablation catheter according to claim 1 or 2, characterized in that: The laser ablation catheter further comprises a balloon assembly, which is sealed and sleeved on the distal end of the tube structure, so that the distal ends of the tube structure and the optical fiber bundle are arranged inside the balloon assembly.

9. The renal artery laser ablation catheter according to claim 8, characterized in that: The balloon assembly comprises a first balloon, and the first balloon is sealed and sleeved on the distal end of the tube structure, so that the distal ends of the tube structure and the optical fiber bundle are arranged in the first balloon; or, The balloon assembly includes a second balloon, and the second balloon is sealed and sleeved on the distal end of the optical fiber bundle, so that the tube structure and the distal end of the optical fiber bundle are arranged in the second balloon; or, The balloon assembly includes a first balloon and a second balloon, the first balloon and the second balloon are both sealed and sleeved on the distal end of the optical fiber bundle, the second balloon is sleeved on the periphery of the first balloon, and the tube structure and the distal end of the optical fiber bundle are arranged in the first balloon.

10. The renal artery laser ablation catheter according to claim 3, characterized in that: The tube structure comprises an inner tube and an outer tube; The outer tube is sleeved on the periphery of the inner tube, and is eccentrically arranged with the inner tube to enclose and form a first optical fiber placement channel, and the first optical fiber is arranged in the first optical fiber placement channel; The inner tube has a second optical fiber placement channel, and the second optical fiber is arranged in the second optical fiber placement channel; The optical fiber channel includes the first optical fiber placement channel and the second optical fiber placement channel.

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