Ablation assembly, ablation catheter, and ablation device

Abstract

The embodiments of the present application relate to the field of ablation technology, and in particular, to an ablation assembly, an ablation catheter, and an ablation device. The ablation assembly comprises an electrode and a radially contractible and expandable electrode support. The electrode support is a grid-like structure formed by sequentially connecting a plurality of unit cells, and two ends of the electrode support are tapered to form a distal end and a proximal end of the electrode support. The electrode is fixedly arranged on the electrode support. The ablation assembly can solve the problem that the electrode may be obstructed by struts of the electrode support. The ablation catheter and the ablation device both comprise the ablation assembly, and have the same technical effects as the ablation assembly.

Description

Ablation components, ablation catheters and ablation devices

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202520539243.6, filed on March 25, 2025, entitled "An Ablation Catheter and Ablation Device", and also claims priority to Chinese Patent Application No. 202520539245.5, filed on March 25, 2025, entitled "Ablation Component and Ablation Catheter", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of ablation technology, and more specifically, to ablation components, ablation catheters, and ablation devices. Background Technology

[0004] Catheter ablation is used to treat various arrhythmias, tumors, and other conditions. The ablation catheter plays a crucial role in the procedure, acting as a tool for energy transfer and targeting lesions.

[0005] In an ablation catheter, electrodes are mounted on an electrode support at the distal end of the catheter. The electrode support supports the electrodes and expands to adhere to the catheter wall before ablation begins, then contracts and retracts after ablation. However, for multiple electrodes on the electrode support, the support wires may shift during the expansion and deformation of the support, posing a risk of the electrodes being blocked by the support wires. This can prevent the electrodes from adhering properly to the catheter wall, thus affecting the ablation effect.

[0006] Application content

[0007] This application provides an ablation component, an ablation catheter, and an ablation device, which can solve the problem of the electrode being blocked by the support wire of the electrode holder and improve the ablation effect.

[0008] The embodiments of this application can be implemented as follows:

[0009] An embodiment of this application provides an ablation component, which includes an electrode and an electrode support that can be radially contracted and expanded. The electrode support is a mesh structure formed by sequentially connecting multiple unit grids. The two ends of the electrode support converge to form the distal end and proximal end of the electrode support, respectively. The electrode is fixedly disposed on the electrode support.

[0010] In this design, the electrode support is a mesh structure formed by sequentially connecting multiple unit grids. Multiple intersection points are formed between adjacent unit grids, and each intersection point constrains the deformation of each unit grid. After the electrode is placed on the unit grid of the electrode support, during the radial expansion and deformation of the electrode support, the support wires in each unit grid will not slip relative to each other due to the constraint of the intersection points. Instead, the support wires in the unit grid will expand and deform as a whole with the electrode support. Therefore, the electrode will not be obstructed by the support wires in the unit grid of the electrode support, ensuring the ablation effect of the ablation component.

[0011] In some embodiments, at least one of the plurality of cell grids is provided with a fixing assembly configured for electrode mounting. The fixing assembly includes a first fixing wire, one end of which is connected to the cell grid and the other end of which is a free end. The first fixing wire is configured for electrode to pass through, and the electrode is fixedly connected to the first fixing wire.

[0012] In the above technical solution, a fixing component for electrode installation is provided in at least one of the multiple unit grids. The first fixing wire in the fixing component has a free end. When installing the electrode, it is inserted through the free end of the first fixing wire and fixed to it. On one hand, the electrode is fixed to the electrode support using a through-wire fixing method, making the electrode installation simpler and faster, reducing the difficulty of electrode installation. On the other hand, compared to the continuous support wires of existing electrode supports, where the electrode can only be fixed to the outside of the support wires by adhesive or welding, the first fixing wire and the electrode are inserted and fitted together, integrating the electrode and the first fixing wire into one unit. The first fixing wire provides fixation and support for the electrode, making it less likely for the electrode to detach from the first fixing wire, thus improving the installation stability of the electrode on the electrode support.

[0013] In some embodiments, the unit grid includes a first support wire, a second support wire, a third support wire, and a fourth support wire connected end to end in sequence. The first support wire and the third support wire are parallel to each other, and the second support wire and the fourth support wire are parallel to each other. One end of the first fixing wire is connected to the midpoint of the first support wire, and the free end of the first fixing wire points to the midpoint of the third support wire.

[0014] In the above technical solution, the first support wire, the second support wire, the third support wire, and the fourth support wire form a unit grid. One end of the first fixing wire is connected to the midpoint of the first support wire, and the free end of the first fixing wire faces the midpoint of the third support wire. That is, the free end of the first fixing wire points to the central area of ​​the unit grid. In this way, the electrode has sufficient space to pass through the free end of the first fixing wire. After the electrode is fixed to the first fixing wire, there is a certain distance between the electrode and the first support wire, the second support wire, the third support wire, and the fourth support wire in the unit grid. The electrode is not easily interfered with by the individual support wires in the unit grid.

[0015] In some embodiments, the fixing component further includes a second fixing wire, one end of which is connected to the midpoint of the third support wire, and the other end of which points to the midpoint of the first support wire. The second fixing wire and the first fixing wire are parallel to each other and are fitted together. Along the length direction of the first fixing wire or the second fixing wire, the first fixing wire and the second fixing wire have an overlapping portion. The electrode passes through the overlapping portion of the first fixing wire and the second fixing wire and is fixedly connected to the overlapping portion.

[0016] In the above technical solution, by setting the second fixing wire, the free ends of the second fixing wire and the free ends of the first fixing wire point in opposite directions, the first fixing wire and the second fixing wire form an overlapping part, the second fixing wire and the first fixing wire are parallel to each other and closely fitted, the first fixing wire and the second fixing wire are approximately continuous in the length direction of the first fixing wire, the electrode is inserted and fixed on the overlapping part of the first fixing wire and the second fixing wire and connected to the overlapping part, the first fixing wire and the second fixing wire together provide the electrode with a bearing and fixing function. Even if the electrode slips in the length direction of the first fixing wire or the second fixing wire, under the blocking effect of the first support wire and the third support wire, the electrode is not easy to detach from the first fixing wire or the second fixing wire, which further improves the installation stability of the electrode on the electrode support.

[0017] In some embodiments, the length of the overlapping portion is not less than half the distance between the midpoint of the first support wire and the midpoint of the third support wire; the length of the first fixing wire is equal to the length of the second fixing wire.

[0018] In the above technical solution, the length of the overlapping portion is not less than half the distance between the midpoint of the first support wire and the midpoint of the third support wire, ensuring sufficient length of the overlapping portion and higher stability of the electrode mounted on the first and second fixing wires. The first and second fixing wires are of equal length, and the overlapping portion of the first and second fixing wires is located in the middle region of the first and third support wires. That is, the electrode is mounted in the central region of the unit grid, and there is sufficient spacing between the electrode and the first, second, third, and fourth support wires in the unit grid, making the electrode less susceptible to interference from the support wires of the unit grid.

[0019] In some embodiments, the first fixing wire, the second fixing wire, and the unit mesh are integrally formed.

[0020] In the above technical solution, the first fixing wire, the second fixing wire, and the unit grid are integrally formed. The first fixing wire and the second fixing wire have high structural stability, the electrode support has good integrity, which can meet the installation stability requirements of the electrode, and the processing is simple.

[0021] In some embodiments, the plurality of unit grids includes a first unit grid and a second unit grid, wherein the area of ​​the hollowed-out region of the second unit grid is an integer multiple of the area of ​​the hollowed-out region of the first unit grid.

[0022] In the above technical solution, multiple unit grids are divided into first unit grids and second unit grids. The area of ​​the hollow area of ​​the second unit grid is an integer multiple of the area of ​​the hollow area of ​​the first unit grid. This is equivalent to locally reducing the number of support wires in the multiple first unit grids on the electrode support to obtain the second unit grid. While ensuring the overall stability of the electrode support, the density of the support wires at corresponding positions on the electrode support is different, thereby reducing the diameter at corresponding positions on the electrode support and making it more widely applicable.

[0023] In some embodiments, there are multiple second unit grids, which are arranged circumferentially and / or axially along the electrode support.

[0024] In the above technical solution, multiple second-unit grids are arranged along the circumferential and / or axial direction of the electrode support. The positional distribution of the second-unit grids on the electrode support can be designed according to actual conditions, making the distribution of the second-unit grids more flexible. Furthermore, multiple second-unit grids can meet the installation requirements of multiple electrodes.

[0025] In some embodiments, the number of electrodes is multiple, and at least a portion of the multiple second cell grids are provided with fixing components.

[0026] In the above technical solution, a portion of the multiple second-unit grids are equipped with fixing components. These second-unit grids and fixing components can be positioned on the electrode support at the locations where electrodes need to be placed, facilitating the attachment of multiple electrodes to the wall. Another portion of the second-unit grids can be distributed in areas of the electrode support with larger diameters or denser thermocouple wire distribution, effectively controlling the diameter of the corresponding areas on the electrode support.

[0027] This application also provides an ablation catheter, which includes a tip, a catheter, a traction wire, and an ablation component of any of the foregoing embodiments. The tip is connected to the distal end of the electrode support, and the catheter is connected to the proximal end of the electrode support. The catheter has a first cavity extending in the axial direction. The traction wire is connected to the tip and is movably inserted through the first cavity and the electrode support. When the traction wire moves from the distal end to the proximal end, the electrode support switches from a contracted state to an expanded state.

[0028] This application embodiment also provides an ablation catheter, including a catheter, a mesh-like stent, and an electrode. The mesh-like stent includes multiple first stent wires spaced apart and arranged sequentially, and multiple second stent wires spaced apart and arranged sequentially. Each first stent wire alternately overlaps with multiple second stent wires, and each second stent wire alternately overlaps with multiple first stent wires. The intersections of the first and second stent wires form several overlapping portions. The two ends of the multiple first and second stent wires converge to form the distal and proximal ends of the mesh-like stent, respectively. The proximal end of the mesh-like stent is connected to the catheter. The electrode is disposed on the mesh-like stent. When the mesh-like stent is in an expanded state, the electrode is located on the overlapping portion, and the electrode is connected to a first stent wire or a second stent wire on the overlapping portion away from the central axis of the mesh-like stent.

[0029] In some embodiments, there are multiple electrodes, and when the tubular support is in an expanded state, the multiple electrodes are spaced apart in both the circumferential and axial directions of the tubular support.

[0030] In some embodiments, the plurality of electrodes are respectively disposed on a plurality of first support wires; or, the plurality of electrodes are respectively disposed on a plurality of second support wires; along the axial direction of the mesh-like support, the distance between two adjacent electrodes is not less than at least one times the distance between two adjacent overlapping portions.

[0031] In some embodiments, along the circumference of the tubular support, two adjacent electrodes are respectively disposed on the first support wire and the second support wire.

[0032] In some embodiments, the plurality of electrodes are arranged in a straight line or staggered into multiple straight lines on the circumferential unfolded view of the tubular support.

[0033] In some embodiments, the number of the first support wire and the number of the second support wire are equal.

[0034] In some embodiments, the electrode is a sheet electrode, which includes a main body and a plurality of bent portions. The plurality of bent portions are distributed at least on opposite sides of the main body, and the plurality of bent portions can be bent relative to the main body toward the same side in the direction of the center of the main body and then abut against each other.

[0035] In some embodiments, the sum of the number of the first support wire and the second support wire is at least four.

[0036] In some embodiments, the ablation catheter further includes a tip disposed at the distal end of the tubular support, the tip being provided with a contrast agent.

[0037] In some embodiments, the ablation catheter further includes a central wire movably inserted through the catheter and the tubular support, the distal end of the central wire being connected to the tip end, the proximal end of the central wire being inserted through the tubular support and the catheter, and connected to a handle; the central wire is configured to control the tubular support to switch between a contracted state and an expanded state.

[0038] This application also provides an ablation device, including the ablation catheter described above. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 is a schematic diagram of the currently disclosed tubular scaffold unfolded on the circumferential surface;

[0041] Figure 2 is a schematic diagram of the circumferential surface unfolding after the electrodes in the currently disclosed mesh-like support are set at the intersection position;

[0042] Figure 3 is a schematic diagram of the structure of the electrode holder provided in some embodiments of this application;

[0043] Figure 4 is an enlarged view of point A in Figure 3;

[0044] Figure 5 is a schematic diagram of the structure of the ablation component provided in some embodiments of this application;

[0045] Figure 6 is a schematic diagram of the structure of the ablation catheter provided in some embodiments of this application;

[0046] Figure 7 is a schematic diagram of the structure of the ablation assembly provided in some embodiments of this application, in which the electrode is a tubular electrode;

[0047] Figure 8 is a schematic diagram of the structure of the ablation assembly provided in some other embodiments of this application, in which the electrode is a tubular electrode;

[0048] Figure 9 is a schematic diagram of the structure of a sheet electrode with a bent portion provided in some other embodiments of this application before assembly;

[0049] Figure 10 is a schematic diagram of the structure of a sheet electrode with a bent portion assembled according to some other embodiments of this application;

[0050] Figure 11 is a schematic diagram of the structure of the ablation catheter provided in some embodiments of this application;

[0051] Figure 12 is a schematic diagram of the structure of the mesh-like stent of the ablation catheter provided in some embodiments of this application;

[0052] Figure 13 is a schematic diagram of the circumferential surface unfolding of a mesh-like scaffold with eighteen scaffold wires provided in some embodiments of this application;

[0053] Figure 14 is a schematic diagram of the circumferential surface unfolding of a mesh-like scaffold with twelve scaffold wires provided in some embodiments of this application.

[0054] Figure 15 is a schematic diagram of the circumferential surface unfolding of a mesh-like scaffold with ten scaffold wires provided in some embodiments of this application.

[0055] Figure 16 is a schematic diagram of the circumferential surface unfolding of a mesh-like scaffold with ten scaffold wires provided in some other embodiments of this application.

[0056] Figure 17 is a schematic diagram of the circumferential surface unfolding of a mesh-like support with ten support wires in some embodiments of this application;

[0057] Figure 18 is a schematic diagram of the circumferential surface unfolding of a mesh-like scaffold with eight scaffold wires provided in some embodiments of this application.

[0058] Figure 19 is a schematic diagram of the circumferential surface unfolding after the axial distance between two adjacent electrodes in the mesh-like support provided in some embodiments of this application is increased.

[0059] Icons in Figures 1 and 2: 20 - electrode; 200 - positive spiral support wire; 201 - negative spiral support wire; 13 - overlapping section;

[0060] Icons in Figures 3 to 10: 100-Ablation component; 10-Electrode support; 11-Unit grid; 111-First unit grid; 112-Second unit grid; 113-First support wire; 114-Second support wire; 115-Third support wire; 116-Fourth support wire; 12-Proximal end; 13-Distal end; 20-Electrode; 210-Main body; 211-Bending part; 30-Fixing component; 31-First fixing wire; 32-Second fixing wire; 33-Overlapping part; 200-Ablation catheter; 201-Tip; 202-Catheter; 203-Traction wire;

[0061] Icons in Figures 11 to 19: 100-ablation catheter; 10-mesh stent; 11-first stent wire; 12-second stent wire; 13-overlapping portion; 14-proximal end; 15-distal end; 20-electrode; 30-tip end; 40-catheter; 50-center wire; 60-handle; 200-positive spiral stent wire; 201-negative spiral stent wire. Detailed Implementation

[0062] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0063] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0064] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0065] In the description of the embodiments of this application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on this application. In addition, the terms "first," "second," "third," etc. are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0066] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up" and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0067] Figure 1 shows a schematic diagram of the currently disclosed tubular stent after unfolding on a circumferential surface. The tubular stent is a mesh-like structure formed by multiple positive spiral stent wires 200 and negative spiral stent wires 201 interlaced. Electrodes 20 are generally mounted on the positive spiral stent wires 200 or negative spiral stent wires 201 on the same side. Figure 1 illustrates the case where multiple electrodes are mounted on the positive spiral stent wires 200. Because the tubular stent is a mesh-like structure formed by the interlaced positive spiral stent wires 200 and negative spiral stent wires 201, to avoid over-ablation, the multiple electrodes 20 do not overlap axially, and are spirally distributed on multiple positive spiral stent wires 200 respectively. Since the spiral stent wires interlaced on both sides of the electrode 20 are one up and one down, in the actual vascular environment, the spiral stent wires running on one side of the electrode 20 may slip onto the electrode 20, obstructing the electrode 20 and preventing it from adhering well to the vessel wall, thus affecting the ablation effect. Increasing the grid spacing can reduce the probability of the spiral support slipping onto the electrode 20 and blocking it, but it will also reduce the overall stability of the mesh (the denser the grid, the more stable the shape; the sparser the grid, the less stable the shape).

[0068] As shown in Figure 2, which is a schematic diagram of the circumferential surface unfolded after the electrodes in the currently disclosed mesh-like support are set at the intersection position, if the electrodes 20 are set at the intersection position of the mesh, in order to ensure that the risk of the electrodes 20 being blocked by the support wire is low, the electrodes 20 need to be arranged in the same axial position. If multiple electrodes 20 do not overlap in the axial direction, it will inevitably lead to the electrodes 20 being blocked by the spiral support wire. Figure 2 illustrates the situation where the electrodes are set at the intersection position but are blocked by the negative spiral support wire 201.

[0069] This application provides an ablation component. Referring to Figures 3, 4, and 5, the ablation component 100 includes an electrode 20 and an electrode support 10 that can be radially contracted and expanded. The electrode support 10 is formed by sequentially connecting multiple unit grids 11, and the formed electrode support 10 has a grid structure. The two ends of the electrode support 10 converge to form the distal end 13 and the proximal end 12 of the electrode support 10, respectively. The electrode 20 is fixedly disposed on the unit grids 11 of the electrode support 10.

[0070] Optionally, multiple intersection points are formed between adjacent unit grids 11 on the electrode support 10. Each intersection point constrains the deformation of the support wires in each unit grid 11. After the electrode 20 is placed on the unit grids 11 of the electrode support 10, during the radial expansion and deformation of the electrode support 10, the support wires in each unit grid 11 will not slip relative to each other due to the constraint of each intersection point. Instead, the support wires in the unit grid 11 will expand and deform as a whole with the electrode support 10. Therefore, the electrode 20 will not be blocked by the support wires in the unit grids 11 on the electrode support 10, allowing the electrode 20 to fit well against the wall of the ablation area, ensuring that the ablation component 100 has a good ablation effect.

[0071] The electrode support 10 can be made by cutting or laser engraving metal tubes or polymer tubes, or it can be made by precision powder metallurgy. Then it is expanded by a jig and heated to shape. The processing and shaping temperature is different for different materials.

[0072] The shapes of the individual grid cells 11 in the electrode support 10 can be the same or different. Optionally, the shapes of the individual grid cells 11 in the electrode support 10 can be exactly the same. Optionally, the areas of the individual grid cells 11 can be equal or unequal, depending on the actual situation.

[0073] In some embodiments, at least one of the plurality of cell grids 11 is provided with a fixing component 30 configured for mounting an electrode 20. The fixing component 30 includes a first fixing wire 31 configured for the electrode 20 to pass through. One end of the first fixing wire 31 is connected to the cell grid 11, and the other end of the first fixing wire 31 is a free end. When the electrode 20 is installed, after the electrode 20 passes through the free end of the first fixing wire 31, the electrode 20 is fixedly connected to the first fixing wire 31.

[0074] In the above embodiment, by setting a fixing component 30 in at least one of the multiple unit grids 11, the electrode 20 is installed through the fixing component 30. The electrode 20 is fixed to the electrode support 10 by a through-and-fix installation method. On the one hand, this makes the installation of the electrode 20 simple and quick, reducing the installation difficulty of the electrode 20. On the other hand, compared with the currently disclosed electrode support 10 where the support wire is continuous, the electrode 20 can only be fixed to the outside of the support wire of the electrode support 10 by adhesive or welding. In the above embodiment, the first fixing wire 31 is through-and-fitted with the electrode 20, and the electrode 20 and the first fixing wire 31 are integrated. The first fixing wire 31 provides fixation and support for the electrode 20, making it less likely for the electrode 20 to detach from the first fixing wire 31, thus improving the installation stability of the electrode 20.

[0075] At least one of the multiple unit grids 11 is provided with a fixing component 30. This means that only one of the multiple unit grids 11 can be provided with a fixing component 30, or all of the multiple unit grids 11 can be provided with a fixing component 30. The specific method depends on the number of electrodes 20.

[0076] When the ablation catheter 200 is a multi-electrode 20, then the multiple unit grids 11 of the electrode support 10 are provided with fixing components 30. Each unit grid 11 is provided with one fixing component 30, and one fixing component 30 can be used to install and fix one electrode 20. That is, the number of fixing components 30 is not less than the number of electrodes 20. The setting position of the fixing components 30 in the multiple unit grids 11 can be adaptively selected according to the arrangement position of the electrodes 20 on the electrode support 10. The specific position depends on the actual situation and will not be limited here.

[0077] The material of the first fixing wire 31 can be the same as that of the unit grid 11. The unit grid 11 is formed by multiple support wires. The number of support wires depends on the shape of the unit grid 11. For example, when the shape of the unit grid 11 is rhomboid, the number of support wires in each unit grid 11 is four.

[0078] The connection point between the first fixing wire 31 and the unit grid 11 can be determined according to the actual situation. For example, the connection point between the first fixing wire 31 and the unit grid 11 can be the intersection of two adjacent support wires in the unit grid 11. Of course, the connection point between the first fixing wire 31 and the unit grid 11 can also be located at any position along the length of the support wire in the unit grid 11, such as the connection point of the first fixing wire 31 being located at the midpoint along the length of the electrode 20 wire in the unit grid 11. Whether the first fixing wire 31 is connected to the intersection of the support wires in the unit grid 11 or to the midpoint of the support wire in the unit grid 11, the free end of the first fixing wire 31 must face the center direction of the area enclosed by the unit grid 11. In this way, the free end of the first fixing wire 31 and each support wire in the unit grid 11 have a certain distance, which makes it easy for the electrode 20 to pass through the first fixing wire 31, and there is a certain gap between the electrode 20 and each support wire in the unit grid 11, so that the electrode 20 is less likely to interfere with the unit grid 11.

[0079] After the electrode 20 is inserted onto the first fixing wire 31, it can be fixedly connected to the first fixing wire 31 by means of adhesive, welding, or other methods. The electrode 20 is first inserted and fitted onto the first fixing wire 31, and then, through adhesive or welding, it is combined with the first fixing wire 31 of the electrode support 10, ensuring the stability of the electrode 20 mounted on the electrode support 10. A thermocouple wire is installed inside the electrode 20, passing through the cavity of the conduit 202 along the electrode support 10. The thermocouple wire is connected to the handle and serves to measure temperature.

[0080] To further improve the installation stability of electrode 20 on the first fixing wire 31 and prevent slippage between electrode 20 and the first fixing wire 31, a stop structure (not shown in the figure) can be provided at the free end of the first fixing wire 31. The stop structure can have a certain deformation capability; for example, the stop structure can be a metal spring, or it can be an arc-shaped protrusion formed by the free end of the first fixing wire 31. When inserting electrode 20, the cavity of electrode 20 deforms after squeezing the stop structure, and electrode 20 is inserted into the first fixing wire 31. Then, electrode 20 is fixed by adhesive or welding. Even if the connection point between electrode 20 and the first fixing wire 31 becomes loose, electrode 20 will not detach from the first fixing wire 31 under the action of the stop structure, further improving the stability of electrode 20 installed on electrode support 10.

[0081] In some embodiments, referring to Figures 3 and 4, the unit grid 11 includes a first support wire 113, a second support wire 114, a third support wire 115, and a fourth support wire 116 connected end to end in sequence. The first support wire 113 and the third support wire 115 are parallel to each other, and the second support wire 114 and the fourth support wire 116 are parallel to each other. One end of the first fixing wire 31 is connected to the midpoint of the first support wire 113, and the free end of the first fixing wire 31 points to the midpoint of the third support wire 115. The first support wire 113, the second support wire 114, the third support wire 115, and the fourth support wire 116 form a unit grid 11. One end of the first fixing wire 31 is connected to the midpoint of the first support wire 113, and the free end of the first fixing wire 31 faces the midpoint of the third support wire 115, that is, the free end of the first fixing wire 31 points to the central area of ​​the unit grid 11. In this way, the electrode 20 has sufficient space to pass through the free end of the first fixing wire 31. After the electrode 20 is fixed to the first fixing wire 31, the electrode 20 has a certain distance from the first support wire 113, the second support wire 114, the third support wire 115, and the fourth support wire 116 in the unit grid 11. The electrode 20 is not easily interfered with by the individual support wires in the unit grid 11.

[0082] Of course, one end of the first fixing wire 31 can also be connected to the midpoint of the second support wire 114, the third support wire 115 or the fourth support wire 116, then the free end of the first fixing wire 31 will point to the midpoint of the fourth support wire 116, the first support wire 113 or the second support wire 114.

[0083] In some embodiments, the fixing component 30 further includes a second fixing wire 32, one end of which is connected to the midpoint of the third support wire 115, and the other end of which points to the midpoint of the first support wire 113. The second fixing wire 32 and the first fixing wire 31 are parallel to each other and fit together. Along the length direction of the first fixing wire 31 or the second fixing wire 32, the first fixing wire 31 and the second fixing wire 32 have an overlapping portion 33, and the electrode 20 passes through the overlapping portion 33 of the first fixing wire 31 and the second fixing wire 32. With the second fixing wire 32, the free ends of the second fixing wire 32 and the free ends of the first fixing wire 31 point in opposite directions. The first fixing wire 31 and the second fixing wire 32 are at least partially overlapped and form an overlapping portion 33. The second fixing wire 32 and the first fixing wire 31 are parallel to each other and closely fitted, so that the first fixing wire 31 and the second fixing wire 32 are approximately continuous in the length direction of the first fixing wire 31. After the electrode 20 is inserted and fixed on the overlapping portion 33 of the first fixing wire 31 and the second fixing wire 32, the first fixing wire 31 and the second fixing wire 32 jointly provide bearing and fixing force for the electrode 20. Even if the electrode 20 slips in the length direction of the first fixing wire 31 or the second fixing wire 32, the electrode 20 is not easy to detach from the first fixing wire 31 or the second fixing wire 32 under the blocking effect of the first support wire 113 and the third support wire 115, which further improves the stability of the electrode 20 installed on the electrode support 10.

[0084] The first fixing wire 31 and the second fixing wire 32 can be made of the same material as the unit mesh 11, allowing the first fixing wire 31 and the second fixing wire 32 to undergo recoverable bending deformation, i.e., elastic deformation. When installing the electrode 20, the first fixing wire 31 can be lifted upwards to offset it from the second fixing wire 32, and the electrode 20 can be threaded onto the first fixing wire 31. Then, the second fixing wire 32 is threaded into the electrode 20 from the other end, with the electrode 20 passing through the overlap 33 of the first fixing wire 31 and the second fixing wire 32. The electrode 20 is then fixedly connected to the first fixing wire 31 and the second fixing wire 32. Various methods can be used to connect the electrode 20 to the first fixing wire 31 and the second fixing wire 32, such as using adhesive or welding to fix the electrode 20.

[0085] The lengths of the first fixing wire 31 and the second fixing wire 32 can be equal or unequal. Furthermore, the length of the overlapping portion 33 of the first fixing wire 31 and the second fixing wire 32 can be set according to the actual situation. The longer the overlapping portion 33, the higher the stability of the electrode 20 mounted on the first fixing wire 31 and the second fixing wire 32. However, if the length of the overlapping portion 33 is too large, it will increase the difficulty of threading the electrode 20 through the first fixing wire 31 and the second fixing wire 32. Therefore, the length of the overlapping portion 33 of the first fixing wire 31 and the second fixing wire 32 can be reasonably selected according to the actual situation.

[0086] In some embodiments, referring to Figure 4, the length of the overlapping portion 33 is not less than half the distance from the midpoint of the first support wire 113 to the midpoint of the third support wire 115. Setting the length of the overlapping portion 33 to not less than half the distance from the midpoint of the first support wire 113 to the midpoint of the third support wire 115 ensures that the length of the overlapping portion 33 is sufficient, resulting in greater stability of the electrode 20 mounted on the first fixing wire 31 and the second fixing wire 32.

[0087] The length of the overlapping portion 33 is not less than half the distance from the midpoint of the first support wire 113 to the midpoint of the third support wire 115. This means that the length of the overlapping portion 33 can be one-half, two-thirds, or three-fifths of the distance from the midpoint of the first support wire 113 to the midpoint of the third support wire 115.

[0088] In some embodiments, referring to Figure 4, the length of the first fixing wire 31 is equal to the length of the second fixing wire 32. With the lengths of the first fixing wire 31 and the second fixing wire 32 set to be equal, the overlap 33 of the first fixing wire 31 and the second fixing wire 32 is located in the middle region between the first support wire 113 and the third support wire 115. That is, the electrode 20 is installed in the central region of the unit grid 11, and the electrode 20 has sufficient spacing from the first support wire 113, the second support wire 114, the third support wire 115, and the fourth support wire 116 in the unit grid 11, making it less susceptible to interference from the support wires of the unit grid 11.

[0089] In some embodiments, the first fixing wire 31 and the second fixing wire 32 are integrally formed with the unit grid 11. Integrating the first fixing wire 31 and the second fixing wire 32 with the unit grid 11 results in high structural stability of the first fixing wire 31 and the second fixing wire 32, good overall integrity of the electrode support 10, and can meet the installation stability requirements of the electrode 20, while also simplifying the processing.

[0090] In some embodiments, the plurality of unit grids 11 include a first unit grid 111 and a second unit grid 112, wherein the area of ​​the hollowed-out region of the second unit grid 112 is an integer multiple of the area of ​​the hollowed-out region of the first unit grid 111. Dividing the plurality of unit grids 11 into a first unit grid 111 and a second unit grid 112, with the area of ​​the hollowed-out region of the second unit grid 112 being an integer multiple of the area of ​​the hollowed-out region of the first unit grid 111, is equivalent to locally and specifically reducing the number of support wires in the area enclosed by the plurality of first unit grids 111 on the electrode support 10, thereby obtaining the second unit grid 112. While satisfying the overall stability of the electrode support 10, this results in a difference in the density of support wires at corresponding positions on the electrode support 10, reducing the diameter at corresponding positions on the electrode support 10. This allows for the adaptation to smaller guiding tubes 202, which not only has a wider range of applications but also results in smaller wounds.

[0091] The area of ​​the hollowed-out region of the second unit grid 112 is an integer multiple of the area of ​​the hollowed-out region of the first unit grid 111. The area of ​​the hollowed-out region of the second unit grid 112 can be two, four, or eight times the area of ​​the hollowed-out region of the first unit grid 111, etc., depending on the actual situation.

[0092] Understandably, the diameter of the distal end 13 of the electrode holder 10 is relatively smaller due to the fewer thermocouple wires. The diameter of the proximal end 12 of the electrode holder 10 is relatively larger due to the greater number of electrodes 20 and their thermocouple wires. Therefore, a portion of the multiple second-cell meshes 112 can be distributed on the electrode holder 10 near the proximal end 12 to reduce the diameter of the proximal end 12. Another portion of the multiple second-cell meshes 112 can be distributed on the electrode holder 10 at the locations where the electrodes 20 are to be installed.

[0093] In some embodiments, the first unit grid 111 and the second unit grid 112 may be parallelograms.

[0094] Optionally, referring to Figures 3 and 4, both the first unit grid 111 and the second unit grid 112 are rhomboid in shape, and the area of ​​the second unit grid 112 is four times the area of ​​the first unit grid 111. With the first unit grid 111 and the second unit grid 112 having the same shape, the area of ​​the second unit grid 112 being four times the area of ​​the first unit grid 111 results in a larger span between adjacent support wires in the second unit grid 112, a more dispersed distribution of the support wires, and a relatively smaller diameter in the area of ​​the electrode support 10 where the second unit grid 112 is distributed. This reduces the diameter of the corresponding position on the electrode support 10, thereby enabling the use of smaller guiding tubes 202, broadening the applicability range and resulting in smaller wounds.

[0095] Given that the area of ​​the hollowed-out region of the second unit grid 112 is four times the area of ​​the hollowed-out region of the first unit grid 111, and that both the first unit grid 111 and the second unit grid 112 are rhomboid in shape, it is understandable that the length of each support wire in the second unit grid 112 is twice the length of the support wire in the first unit grid 111.

[0096] In actual manufacturing, the support wires at certain locations of the electrode support 10 are removed. Taking an example where the area of ​​the hollowed-out region of the second unit grid 112 is four times the area of ​​the hollowed-out region of the first unit grid 111, the area enclosed by the four first unit grids 111 is reduced in size. That is, the support wires in the middle of the area enclosed by the four first unit grids 111 are removed, leaving the middle area completely hollowed out. This results in the four first unit grids 111 forming a second unit grid 112 with a larger hollowed-out area. The length of each support wire in the second unit grid 112 is twice the length of the support wires in the first unit grid 111. For the same area, the support wires in the second unit grid 112 are more dispersed than those in the first unit grid 111.

[0097] In some embodiments, there are multiple second unit grids 112, which are arranged circumferentially, axially, or simultaneously along both axes of the electrode support 10. The arrangement of the second unit grids 112 on the electrode support 10 can be designed according to actual conditions, allowing for more flexible distribution. Furthermore, multiple second unit grids 112 can meet the installation requirements of multiple electrodes 20.

[0098] The arrangement of multiple second-unit meshes 112 along the circumferential and / or axial direction of the electrode support 10 means that the multiple second-unit meshes 112 can be distributed along the axial direction of the electrode support 10, or the multiple second-unit meshes 112 can be spaced apart along the circumferential direction of the electrode support 10, or the multiple second-unit meshes 112 can be arranged along both the circumferential and axial directions of the electrode support 10. Optionally, the multiple second-unit meshes 112 are arranged along both the circumferential and axial directions of the electrode support 10.

[0099] In some embodiments, there are multiple electrodes 20, and at least a portion of the multiple second unit grids 112 are provided with fixing components 30. The fixing components 30 are provided in a portion of the multiple second unit grids 112, and the portion of the second unit grids 112 and the fixing components 30 can be correspondingly disposed on the electrode support 10 at the positions where the electrodes 20 need to be arranged, facilitating the attachment of multiple electrodes 20 to the wall. Another portion of the second unit grids 112 can be distributed in areas of the electrode support 10 with larger diameters or denser thermocouple wire distribution, thereby effectively controlling the diameter of the corresponding areas on the electrode support 10.

[0100] The electrode 20 can have various shapes; for example, it can be a tubular electrode or a sheet electrode. Figure 7 illustrates the case where the electrode 20 is a tubular electrode, and Figure 8 illustrates the case where the electrode 20 is an elliptical tubular electrode.

[0101] When electrode 20 is a sheet electrode, it can be a flat electrode or a sheet electrode with bends. Figures 9 and 10 illustrate the state of the sheet electrode with bends before and after assembly. As shown in Figure 9, the sheet electrode 20 includes a main body 210 and bends 211. There can be multiple bends 211, which are spaced apart around the periphery of the main body 210. The bends 211 can be bent relative to the main body 210. Before assembly, the bends 211 and the main body 210 are on the same plane. As shown in Figure 10, the multiple bends 211 are bent toward the center of the main body 210. The orthographic projection of the bends 211 falls on the orthographic projection of the thickness direction of the main body 210. The sheet electrode can be further bonded and fixed by being secured to the first fixing wire 31 and / or the second fixing wire 32 through the multiple bends 211.

[0102] The sheet electrode 20 allows for a smaller overall diameter of the ablation assembly 100. The electrode 20 can also be a multilayer composite FPC, integrating the electrode 20 with temperature measurement and radio frequency sensing into one unit.

[0103] This application embodiment also provides an ablation catheter 200. Referring to Figures 5 and 6, the ablation catheter 200 includes a tip 201, a catheter 202, a traction wire 203, and the ablation component 100 of any of the aforementioned embodiments. The tip 201 is connected to the distal end 13 of the electrode support 10, and the catheter 202 is connected to the proximal end 12 of the electrode support 10. The catheter 202 has a first cavity extending in the axial direction. The traction wire 203 is connected to the tip 201 and is movably inserted through the first cavity and the electrode support 10. When the traction wire 203 moves from the distal end 13 to the proximal end 12, the electrode support 10 switches from a contracted state to an expanded state.

[0104] Under the action of the traction wire 203, the head end 201 can be pulled, thereby driving the electrode support 10 to complete the form switching between the contracted state and the expanded state, so that the electrode 20 on the electrode support 10 adheres to the wall and completes radiofrequency ablation. The operation is simple and quick.

[0105] Referring to Figures 11 to 19 below, the ablation catheter 100 provided in this embodiment includes a catheter 40, a mesh-like stent 10, and an electrode 20. The mesh-like stent 10 includes multiple first stent wires 11 arranged alternately and spaced apart from each other, and multiple second stent wires 12 arranged alternately and spaced apart from each other. Each first stent wire 11 is alternately overlapped with multiple second stent wires 12, and each second stent wire 12 is alternately overlapped with multiple first stent wires 11. The overlap of the first stent wires 11 and the second stent wires 12... The forked portion has several overlapping portions 13; the two ends of multiple first stent wires 11 and multiple second stent wires 12 converge to form the distal end 15 and proximal end 14 of the tubular stent 10, respectively, and the proximal end 14 of the tubular stent 10 is connected to the conduit 40; the electrode 20 is disposed on the tubular stent 10; wherein, when the tubular stent 10 is in an expanded state, the electrode 20 is located on the overlapping portion 13, and the electrode 20 is connected to the first stent wire 11 or the second stent wire 12 on the side of the overlapping portion 13 away from the central axis of the tubular stent 10.

[0106] The tubular stent 10 is made of multiple first stent wires 11 and multiple second stent wires 12 interwoven together. The tubular stent 10 forms a stable tubular structure through the interweaving of multiple first stent wires 11 and multiple second stent wires 12. The two ends of the first stent wires 11 and the second stent wires 12 in the tubular stent 10 converge to form the proximal end 14 and the distal end 15 of the tubular stent 10. The proximal end 14 of the tubular stent 10 is connected and fixed to the conduit 40. The tubular stent 10 has good extensibility, which allows the electrodes 20 on the tubular stent 10 to be effectively attached to the wall. The overlapping portion 13 is formed at the intersection of the first support wire 11 and the second support wire 12. When the tubular support 10 is in an expanded state, the electrode 20 is placed on the overlapping portion 13 and connected to the first support wire 11 or the second support wire 12 on the side of the overlapping portion 13 away from the central axis of the tubular support 10. That is, the electrode 20 is located on the outermost side of the overlapping portion 13. The electrode 20 will not be blocked by the first support wire 11 and the second support wire 12, which reduces the probability of the electrode 20 being blocked by the first support wire 11 and the second support wire 12. This is conducive to the electrode 20 adhering better to the wall and the ablation effect is better.

[0107] Those skilled in the art will understand that the following description is merely exemplary, and similarly, the ablation catheter provided in this application can be adapted to other ablation scenarios such as ultrasound ablation, laser ablation, cryoablation, and chemical ablation after being adapted based on the application scenario.

[0108] The cavities in the following embodiments all use blood vessels as an example, and the application scenario is the ablation of renal sympathetic nerves to treat refractory hypertension. This is only to facilitate the understanding of the technology by those skilled in the art, and is not to exclude the application of the technical solution of this application to other scenarios. It should be understood that each embodiment of this application can be applied to a type of scenario, and those skilled in the art can directly apply it to multiple treatment scenarios under the instructions of the specification. Applying the technical solution of this application to multiple similar scenarios is within the protection scope and implementation method of this application.

[0109] The mesh-like scaffold 10 is woven together by multiple first scaffold wires 11 and second scaffold wires 12 in an interlaced manner, forming a mesh structure. The first scaffold wires 11 and second scaffold wires 12 can be made of metal wire, shape memory alloy wire, or polymer material, and the specific materials of the first scaffold wires 11 and second scaffold wires 12 can be determined according to the actual situation.

[0110] The first support wire 11 and the second support wire 12 extend spirally along the axial direction of the tubular support 10. The spiral winding directions of the first support wire 11 and the second support wire 12 are opposite, thus forming a plurality of overlapping portions 13 at the intersection between the first support wire 11 and the second support wire 12. The overlapping portions 13 are divided into inner and outer sides. The side of the overlapping portion 13 away from the central axis of the tubular support 10 refers to the outer side of the overlapping portion 13. The outer side of the overlapping portion 13 can be either the first support wire 11 or the second support wire 12.

[0111] There are various ways to connect the electrode 20 to the support wire on the overlapping part 13, such as by bonding, welding or applying adhesive.

[0112] It should be noted that the circumferential unfolded view of the tubular support 10 refers to the unfolded view of the tubular support 10 after it has been cut axially in an expanded state and laid flat on a horizontal plane. Understandably, the tubular support 10 includes a main body segment and two connecting segments located at both axial ends of the main body segment. The two connecting segments respectively constitute the proximal end 14 and the distal end 15 of the tubular support 10. The main body segment is the main part of the tubular support, and Figures 12 to 18 show partial circumferential unfolded schematic diagrams of the tubular support (main body segment).

[0113] In some embodiments, referring to FIG11, there are multiple electrodes 20. When the tubular stent 10 is in an expanded state, the multiple electrodes 20 are spaced apart in both the circumferential and axial directions of the tubular stent 10. This spaced-apart distribution of the multiple electrodes 20 in both the axial and circumferential directions ensures that the multiple electrodes 20 on the stent do not overlap in either direction, reducing the risk of over-ablation, resulting in a more uniform and reasonable distribution of the ablation area and better ablation effect. Furthermore, the multiple electrodes 20 on the tubular stent 10 are spaced apart at 360° around the circumference of the tubular stent 10, achieving the purpose of full-quadrant ablation of the target ablation area by the ablation catheter 100.

[0114] Understandably, the multiple electrodes 20 are distributed at intervals along the circumferential and axial directions of the tubular support 10, meaning that the multiple electrodes 20 can be arranged at intervals in both the circumferential and axial directions of the tubular support 10. In other words, the multiple electrodes 20 do not overlap in the axial projection of the tubular support 10, and the circumferential projection of the multiple electrodes 20 is evenly distributed on the circumferential cross-section of the tubular support 10, meaning that the multiple electrodes 20 also do not overlap in the circumferential projection of the tubular support 10.

[0115] The number of electrodes 20 can be two, four, six, or eight, depending on the specific circumstances. Optionally, the number of electrodes 20 is six, with the six electrodes 20 evenly spaced circumferentially on the tubular support 10 and also spaced axially on the tubular support 10.

[0116] In some embodiments, please refer to Figure 19, which illustrates a partial unfolding of the circumferential surface of the tubular support 10 after the axial distance between two adjacent electrodes 20 is increased, where the two adjacent electrodes 20 are respectively disposed on different first support wires 11. Multiple electrodes 20 are disposed on multiple first support wires 11; or, multiple electrodes 20 are disposed on multiple second support wires 12. Along the axial direction of the tubular support 10, the distance between two adjacent electrodes 20 is not less than at least twice the distance between two adjacent overlapping portions 13. Since the first support wires 11 and the second support wires 12 are alternately distributed, disposing of multiple electrodes 20 on either the first support wire 11 or the second support wire 12, to prevent two adjacent first support wires 11 or second support wires 12 from sliding onto the electrodes 20 during the expansion of the tubular support 10, setting the distance between two adjacent electrodes 20 to not less than at least twice the distance between two adjacent overlapping portions 13 increases the axial distance between two adjacent electrodes 20 and reduces the risk of the electrodes 20 being obstructed by adjacent support wires on the tubular support 10.

[0117] It should be noted that when the ablation catheter 100 has multiple electrodes 20, increasing the axial distance between two adjacent electrodes 20 will result in an excessively long effective working segment of the tubular support 10. This arrangement of electrodes 20 will lead to a reduction in the number of ablation points. Therefore, in actual ablation, there may be a risk that some nerves cannot be effectively ablated. Thus, increasing the axial distance between two adjacent electrodes 20 can be applied when the number of electrodes 20 is small.

[0118] Optionally, the distance between two adjacent electrodes 20 is not less than twice the distance between two adjacent overlapping portions 13.

[0119] In some embodiments, referring to Figures 13 to 18, along the circumferential direction of the tubular support 10, two adjacent electrodes 20 are respectively disposed on the first support wire 11 and the second support wire 12. Since the first support wire 11 and the second support wire 12 are staggered, disposing of two adjacent electrodes 20 on the first support wire 11 and the second support wire 12 respectively can reduce the axial distance between the two adjacent electrodes 20, while also ensuring that both adjacent electrodes 20 are disposed on the outermost side of the overlap portion 13 of the first support wire 11 and the second support wire 12, and can effectively reduce the risk of the first support wire 11 and the second support wire 12 obstructing the electrodes 20 during the expansion of the tubular support 10.

[0120] In some embodiments, multiple electrodes 20 are arranged in a straight line or staggered into multiple straight lines on the circumferential unfolded view of the tubular stent 10. Since the number of stent wires in the tubular stent 10 varies, different numbers of stent wires are suitable for ablation of blood vessels of different diameters. When the number of stent wires in the tubular stent 10 is large, there are more selectable positions for the electrodes 20, and multiple electrodes 20 can be arranged in a straight line on the circumferential unfolded view of the tubular stent 10. Conversely, when the number of stent wires in the tubular stent 10 is small, multiple electrodes 20 can be arranged in multiple straight lines on the circumferential unfolded view of the tubular stent 10. The distribution of the electrodes 20 is more flexible and can be determined according to actual conditions, thus having a wider range of applications.

[0121] In some embodiments, referring to Figures 14 to 18, the sum of the number of first support wires 11 and second support wires 12 is at least greater than four. The sum of the number of first support wires 11 and second support wires 12 can be 4 to 32. Optionally, the sum of the number of first support wires 11 and second support wires 12 is an even number, for example, the sum of the number of first support wires 11 and second support wires 12 can be six, eight, ten, twelve, or eighteen.

[0122] For example, please refer to Figure 13, which shows a partial schematic diagram of the circumferential surface unfolding of the tubular support 10 in its expanded state, with eighteen support wires. This schematic diagram shows the circumferential surface unfolding of the main body segment of the tubular support 10. When the tubular support 10 has eighteen support wires and six electrodes 20 (i.e., nine first support wires 11 and nine second support wires 12), the six electrodes 20 can be labeled sequentially from top left to bottom right on the unfolded circumferential surface of the tubular support 10 as #1 electrode 20 to #6 electrode 20. The six electrodes 20 are arranged in a straight line on the unfolded circumferential surface of the tubular support 10.

[0123] For example, please refer to Figure 14, which shows a partial schematic diagram of the unfolded circumferential surface of the tubular support 10 with twelve support wires in the expanded state, that is, a schematic diagram of the unfolded circumferential surface of the main body segment of the tubular support 10. When the tubular support 10 has twelve support wires and six electrodes 20, that is, six first support wires 11 and six second support wires 12, the six electrodes 20 can be labeled sequentially from the upper left to the lower right of the unfolded diagram of the tubular support as #1 electrode 20 to #6 electrode 20. The six electrodes 20 are arranged in two straight lines on the unfolded circumferential surface of the tubular support 10. Four electrodes 20 are distributed on one of the two straight lines, and two electrodes 20 are distributed on the other straight line.

[0124] For example, please refer to Figures 15, 16, and 17, which illustrate a partial unfolded diagram of the circumferential surface of the tubular support 10 with ten support wires, i.e., an unfolded diagram of the circumferential surface of the main body segment of the tubular support 10. When the tubular support 10 has ten support wires and six electrodes 20, that is, five first support wires 11 and five second support wires 12, the six electrodes 20 can be labeled sequentially from top left to bottom right on the unfolded diagram of the tubular support 10 as #1 electrode 20 to #6 electrode 20. The six electrodes 20 are arranged in two straight lines on the unfolded circumferential surface of the tubular support 10. Three electrodes 20 are distributed on one of the two straight lines, and three electrodes 20 are distributed on the other straight line.

[0125] It should be noted that while Figures 15, 16, and 17 show seven electrodes 20, the actual number of electrodes 20 is six. However, due to the perspective of the unfolded circumferential view of the mesh-like support 10, the electrodes 20 appear to be cut into two parts, with the two parts shown on the upper and lower sides of the figures, creating the illusion of a mismatch in the number of electrodes 20. For example, in Figure 15, the two electrodes 20 on the upper and lower sides of the middle position are actually the same electrode 20. Similarly, the two electrodes 20 on the right side in Figures 16 and 17 are also the same electrode 20.

[0126] For example, please refer to Figure 18, which shows a partial unfolded diagram of the circumferential surface of the tubular support 10 with eight support wires, that is, an unfolded diagram of the circumferential surface of the main body segment of the tubular support 10. When the tubular support 10 has eight support wires and six electrodes 20, that is, when the number of the first support wire 11 and the second support wire 12 are both four, the six electrodes 20 can be labeled as #1 electrode 20 to #6 electrode 20 in the unfolded diagram of the tubular support 10 from the upper left to the lower right.

[0127] It should be noted that Figures 13 to 18 are schematic diagrams showing the circumferential development of the main body segment of the tubular scaffold 10 with different numbers of scaffold wires. To better understand the specific logic of the number of scaffold wires in this scheme, Figure 18 is used as an example. In Figure 18, the number of the first scaffold wire 11 is four, and the number of the second scaffold wire 12 is also four. The two second scaffold wires 12 indicated by the two ends of the dotted line in Figure 18 are actually the same second scaffold wire 12. Because the tubular scaffold 10 is cut along the axial direction, the same second scaffold wire 12 is cut into two segments. The number of scaffold wires in Figures 13 to 17 can be calculated in the same way.

[0128] In some embodiments, on the circumferential unfolded view of the tubular support 10, the mesh shape formed by the first support wire 11 and the second support wire 12 is a parallelogram.

[0129] In this embodiment, the mesh shape formed by the first support wire 11 and the second support wire 12 is rhomboid.

[0130] In some embodiments, the number of first support wires 11 and second support wires 12 is equal. The first support wires 11 and second support wires 12 are alternately overlapped, and the overlapping portions 13 are all formed by the intersection of the first support wires 11 and the second support wires 12. By setting the number of first support wires 11 and second support wires 12 to be equal, the distribution of overlapping portions 13 in the tubular support 10 is more uniform, ensuring the overall stability of the tubular support 10.

[0131] As shown in Figures 9 and 10, electrode 20 is a sheet electrode, comprising a main body 210 and multiple bent portions 211. The multiple bent portions 211 are distributed at least on opposite sides of the main body 210. The multiple bent portions 211 can be bent relative to the main body 210 and then abut against each other in the same direction towards the center of the main body 210. By providing bendable bent portions 211 on the main body 210, when connecting electrode 20 to the first support wire 11 or the second support wire 12, the bent portions 211 can be bent relative to the main body 210 and abut against each other, thereby wrapping electrode 20 around the first support wire 11 or the second support wire 12 at the overlapping portion 13. This makes electrode 20 installation convenient and quick.

[0132] As shown in Figure 9, before assembly, the bent portion 211 of the sheet electrode is in the same plane as the main body 210. As shown in Figure 10, multiple bent portions 211 are bent towards the center of the main body 210, and the orthographic projection of the bent portion 211 falls on the orthographic projection of the thickness direction of the main body 210. The sheet electrode can be wrapped around the first support wire 11 or the second support wire 12 by the multiple bent portions 211. Of course, after the electrode 20 is wrapped around the first support wire 11 or the second support wire 12, it can be further bonded and fixed, and the fixing effect of the electrode 20 is better.

[0133] In some embodiments, referring to FIG12, the ablation catheter 100 further includes a tip 30, which is disposed at the distal end 15 of the tubular support 10 and is provided with a contrast-enhancing component. The tip 30, being disposed at the distal end 15 of the tubular support 10, can connect the distal end 15 of the tubular support 10 to a single unit. By providing a contrast-enhancing component on the tip 30, the contrast-enhancing component enables clear visualization of the distal end 15 of the catheter under medical imaging equipment, allowing physicians to accurately determine the position and status of the catheter within the body.

[0134] The imaging component is made of special materials that can generate unique signals in the imaging mode, or can absorb imaging equipment to emit specific energy waves. The imaging component is a commonly used technology in interventional catheter technology, so we will not go into too much detail about the imaging component here.

[0135] In some embodiments, referring to Figures 11 and 12, the ablation catheter 100 further includes a central wire 50, which is movably inserted through the catheter 40 and the tubular support 10. The distal end of the central wire 50 is connected to the tip 30, and the proximal end of the central wire 50 is inserted through the tubular support 10 and the catheter 40 and connected to the handle 60. The central wire 50 is configured to control the tubular support 10 to switch between a contracted state and an expanded state. The proximal end of the central wire 50 is connected to the handle 60, and the distal end of the central wire 50 is connected to the tip 30. By controlling the central wire 50 through the handle 60, the central wire 50 can drive the tip 30 to pull the tubular support 10 towards the catheter 40, thereby switching the tubular support 10 from a contracted state to an expanded state and achieving adhesion of the electrode 20 on the tubular support 10 to the wall.

[0136] This application also provides an ablation device, which includes an ablation catheter 100 and an ablation host.

[0137] The ablation catheter 100 and ablation equipment can be applied to nerve ablation in different locations and in blood vessels or trachea of ​​various diameters. For example, it can be used for nerve ablation in the renal artery to treat patients with refractory hypertension, nerve ablation in the celiac artery to treat patients with diabetes, tracheal / bronchial vagus nerve branch ablation to treat patients with asthma, and duodenal vagus nerve branch ablation to treat patients with duodenal ulcers. In addition, it can also be used for nerve ablation in other blood vessels or trachea, such as those in the renal pelvis and pulmonary artery.

[0138] The ablation catheter 100 provided here is not limited to the applications listed above in clinical treatment, and can also be configured for nerve ablation in other sites.

[0139] It should be noted that the tubular support 10 in Figures 11 to 19 can be understood as the electrode support 10 in Figures 3 to 10; the overlapping portion 13 in Figures 11 to 19 can be understood as the overlapping portion 33 in Figures 3 to 10; the electrode 20 in Figures 11 to 19 can be understood as the electrode 20 in Figures 3 to 10; the conduit 40 in Figures 11 to 19 can be understood as the conduit 202 in Figures 3 to 10; the central wire 50 in Figures 11 to 19 can be understood as the traction wire 203 in Figures 3 to 10; and the ablation conduit 100 in Figures 11 to 19 can be understood as the ablation conduit 200 in Figures 3 to 10.

[0140] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0141] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims. Industrial applicability

[0142] In summary, this application provides an ablation component, an ablation catheter, and an ablation device. The ablation component can solve the problem of the electrode being blocked by the stent wire of the electrode holder, thereby improving the ablation effect. Both the ablation catheter and the ablation device use the ablation component, so that the ablation catheter and the ablation device have the same effect.

Claims

1. An ablation component, characterized in that, include: An electrode support that can be radially contracted and expanded, wherein the electrode support is a mesh structure formed by sequentially connecting multiple unit grids, and the two ends of the electrode support converge to form the distal end and proximal end of the electrode support, respectively; The electrode is fixedly mounted on the electrode support.

2. The ablation assembly of claim 1, wherein, At least one of the plurality of said cell grids is provided with a fixing assembly configured for mounting the electrode, the fixing assembly including a first fixing wire, one end of the first fixing wire being connected to the cell grid and the other end of the first fixing wire being a free end, the first fixing wire being configured for the electrode to pass through, and the electrode being fixedly connected to the first fixing wire.

3. The ablation assembly of claim 2, wherein, The unit grid includes a first support wire, a second support wire, a third support wire, and a fourth support wire connected end to end in sequence. The first support wire and the third support wire are parallel to each other, and the second support wire and the fourth support wire are parallel to each other. One end of the first fixing wire is connected to the midpoint of the first support wire, and the free end of the first fixing wire points to the midpoint of the third support wire.

4. The ablation assembly of claim 3, wherein, The fixing component also includes: The second fixing wire has one end connected to the midpoint of the third support wire, and the other end of the second fixing wire points to the midpoint of the first support wire. The second fixing wire and the first fixing wire are parallel to each other and fit together. Along the length direction of the first fixing wire or the second fixing wire, the first fixing wire and the second fixing wire have an overlapping portion, and the electrode passes through the overlapping portion of the first fixing wire and the second fixing wire and is fixedly connected to the overlapping portion.

5. The ablation component according to claim 4, characterized in that, The length of the overlapping portion is not less than half the distance between the midpoint of the first support wire and the midpoint of the third support wire; The length of the first fixing wire is equal to the length of the second fixing wire.

6. The ablation component according to claim 4 or 5, characterized in that, The first fixing wire, the second fixing wire, and the unit mesh are integrally formed.

7. The ablation component according to any one of claims 2-6, characterized in that, The plurality of unit grids include a first unit grid and a second unit grid, wherein the area of ​​the hollowed-out region of the second unit grid is an integer multiple of the area of ​​the hollowed-out region of the first unit grid.

8. The ablation component according to claim 7, characterized in that, The number of the second unit grids is multiple, and the multiple second unit grids are arranged along the circumferential and / or axial direction of the electrode support.

9. The ablation component according to claim 8, characterized in that, The number of electrodes is multiple, and at least a portion of the multiple second unit grids are provided with the fixing component.

10. An ablation catheter, characterized in that, The device includes a tip, a catheter, a traction wire, and an ablation assembly according to any one of claims 1-9, wherein the tip is connected to the distal end of the electrode holder, the catheter is connected to the proximal end of the electrode holder, and the catheter has a first cavity extending in an axial direction; the traction wire is connected to the tip and is movably inserted through the first cavity and the electrode holder, and when the traction wire moves from the distal end to the proximal end, the electrode holder switches from a contracted state to an expanded state.

11. An ablation catheter, characterized in that, include: catheter; A tubular stent includes multiple first stent wires spaced apart and arranged sequentially, and multiple second stent wires spaced apart and arranged sequentially; each first stent wire alternately overlaps with multiple second stent wires, and each second stent wire alternately overlaps with multiple first stent wires, with several overlapping portions formed at the intersection of the first and second stent wires; the two ends of the multiple first stent wires and the multiple second stent wires converge to form the distal and proximal ends of the tubular stent, and the proximal end of the tubular stent is connected to the catheter; Electrodes are disposed on the tubular support; When the tubular support is in an expanded state, the electrode is located on the overlapping portion, and the electrode is connected to the first support wire or the second support wire on the side of the overlapping portion away from the central axis of the tubular support.

12. The ablation catheter according to claim 11, characterized in that, The number of electrodes is multiple, and when the tubular support is in an expanded state, the multiple electrodes are spaced apart in the circumferential and axial directions of the tubular support.

13. The ablation catheter according to claim 12, characterized in that, The plurality of electrodes are respectively disposed on the plurality of first support wires; or, the plurality of electrodes are respectively disposed on the plurality of second support wires; Along the axial direction of the tubular support, the distance between two adjacent electrodes is not less than at least twice the distance between two adjacent overlapping portions.

14. The ablation catheter according to claim 12 or 13, characterized in that, Along the circumference of the tubular support, two adjacent electrodes are respectively disposed on the first support wire and the second support wire.

15. The ablation catheter according to claim 14, characterized in that, The electrodes are arranged in a straight line or staggered into multiple straight lines on the circumferential unfolded view of the tubular support.

16. The ablation catheter according to any one of claims 11-15, characterized in that, The number of the first support wire and the number of the second support wire are equal.

17. The ablation catheter according to any one of claims 11-16, characterized in that, The electrode is a sheet electrode, which includes a main body and a plurality of bent portions. The plurality of bent portions are distributed at least on opposite sides of the main body, and the plurality of bent portions can be bent relative to the main body toward the same side in the direction of the center of the main body and then abut against each other.

18. The ablation catheter according to any one of claims 11-17, characterized in that, The sum of the number of the first support wire and the second support wire is at least four.

19. The ablation catheter according to any one of claims 11-18, characterized in that, The ablation catheter also includes: The head end is located at the distal end of the tubular support, and the head end is provided with a developing component.

20. The ablation catheter according to claim 19, characterized in that, The ablation catheter also includes: A central wire is movably inserted through the catheter and the tubular support, with its distal end connected to the head end and its proximal end inserted through the tubular support and the catheter, and connected to a handle; the central wire is configured to control the tubular support to switch between a contracted state and an expanded state.

21. An ablation device, characterized in that, Includes the ablation catheter according to any one of claims 11-20.

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