Ablation catheter and ablation equipment
By employing a cross-woven scaffold wire structure and electrode distribution design in the ablation catheter, the problem of electrodes being obstructed by the scaffold wire was solved, resulting in better adhesion to the wall and ablation effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2026-04-03
AI Technical Summary
In existing ablation catheters, the electrodes are easily blocked by the stent wires, making it impossible to effectively adhere to the wall and affecting the ablation effect.
A mesh-like support is formed by alternating and cross-weaving multiple first support wires and multiple second support wires. The electrodes are placed on the side away from the central axis of the support at the overlapping part to avoid being blocked by the support wires, and the electrodes are evenly distributed in the axial and circumferential directions.
This improved electrode adhesion to the wall, reduced the risk of shading, and achieved better ablation results and a more uniform ablation area distribution.
Smart Images
Figure CN224070567U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of ablation technology, and more specifically, to an ablation catheter and ablation device. Background Technology
[0002] 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.
[0003] In ablation catheters, multiple electrodes are mounted on a mesh stent composed of interwoven positive and negative helical stent wires. This mesh stent, with its multiple interwoven positive and negative helical stent wires forming a stable tubular structure, ensures stable expansion of the stent within vessels of varying diameters and complex routes, allowing for reliable electrode adhesion. However, because the helical stent wires in the mesh stent are interwoven, multiple electrodes are typically mounted on either the positive or negative helical stent wires on the same side. Since the interwoven helical stent wires on both sides of the electrode are arranged in an up-down pattern, in actual vascular environments, adjacent helical stent wires may slip onto the electrode and obstruct its surface, preventing proper electrode adhesion and affecting the ablation effect. Utility Model Content
[0004] This application provides an ablation catheter and ablation device that can reduce the risk of the electrode being blocked by the stent wire and facilitate effective electrode adhesion to the wall.
[0005] In a first aspect, embodiments of this application provide an ablation catheter, which includes 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 multiple 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 or second stent wire on the overlapping portion away from the central axis of the mesh-like stent.
[0006] In this design, the tubular stent is constructed by interweaving multiple first and second stent wires. The stent's stable tubular structure is formed by the vertical interweaving of these wires. The ends of the first and second stent wires converge to form the proximal and distal ends of the stent. The proximal end of the stent is connected and fixed to the catheter. The stent's excellent elasticity allows the electrodes to effectively adhere to the ablation wall. An overlapping section is formed at the intersection of the first and second stent wires. When the stent is in an expanded state, the electrode is positioned on this overlapping section and connected to a first or second stent wire on the side of the overlapping section furthest from the central axis of the stent. This means the electrode is located on the outermost side of the overlapping section, preventing it from being obstructed by the first or second stent wires. This reduces the risk of the electrode being blocked by the first and second stent wires, facilitating better adhesion and improving the ablation effect.
[0007] 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.
[0008] In the above technical solution, multiple electrodes are spaced apart in both the axial and circumferential directions of the mesh-like stent, ensuring that the multiple electrodes on the stent do not overlap in either direction. This reduces 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 on the mesh-like stent are spaced apart at 360° intervals around the circumference of the stent, achieving the goal of full-quadrant ablation of the target ablation area by the ablation catheter.
[0009] In some embodiments, multiple electrodes are respectively disposed on multiple first support wires; or, multiple electrodes are respectively disposed on multiple 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.
[0010] In the above technical solution, since the first support wire and the second support wire are alternately distributed, multiple electrodes are set on the first support wire or the second support wire. In order to prevent two adjacent first support wires or second support wires from sliding onto the electrodes during the expansion of the mesh-like support, the distance between two adjacent electrodes is not less than at least twice the distance between two adjacent overlapping parts. This can increase the axial distance between two adjacent electrodes and reduce the risk of the electrodes being blocked by adjacent support wires on the mesh-like support.
[0011] In some embodiments, along the circumference of the mesh-like support, two adjacent electrodes are respectively disposed on the first support wire and the second support wire.
[0012] In the above technical solution, since the first support wire and the second support wire are staggered, two adjacent electrodes are respectively set on the first support wire and the second support wire. This can reduce the axial distance between two adjacent electrodes, and also allow two adjacent electrodes to be set on the outermost side of the overlap of the first support wire and the second support wire. It can also effectively reduce the risk of the first support wire and the second support wire blocking the electrodes during the expansion of the mesh-like electrode.
[0013] In some embodiments, the multiple electrodes are arranged in a straight line or staggered into multiple straight lines on the circumferential unfolded view of the mesh-like support.
[0014] In the above technical solutions, the number of stent wires in the tubular stent varies, making it suitable for ablation of blood vessels of different diameters. With a larger number of stent wires in the tubular stent, there are more electrode placement options, allowing multiple electrodes to be arranged in a straight line on the unfolded circumferential surface of the stent. Conversely, with a smaller number of stent wires in the tubular stent, multiple electrodes can be arranged in multiple straight lines on the unfolded circumferential surface of the stent, offering more flexible electrode distribution that can be tailored to specific circumstances and has a wider range of applications.
[0015] In some embodiments, the number of first support wires and second support wires are equal.
[0016] In the above technical solution, the first support wire and the second support wire are alternately overlapped, and the overlapping part is formed by the intersection of the first support wire and the second support wire. By setting the number of the first support wire and the second support wire to be equal, the distribution of the overlapping part in the mesh-like support is more uniform, thus ensuring the overall stability of the mesh-like support.
[0017] 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 and then abut against each other in the same direction toward the center of the main body.
[0018] In the above technical solution, by providing a bendable bending part on the main body, when connecting the electrode to the first or second support wire, the bending part can be bent relative to the main body and pressed against it, thereby wrapping the electrode on the first or second support wire at the overlapping part, making electrode installation convenient and quick.
[0019] In some embodiments, the sum of the number of the first support wire and the second support wire is at least four.
[0020] In some embodiments, the ablation catheter further includes a tip disposed at the distal end of the tubular stent, and the tip is provided with a contrast agent.
[0021] In the above technical solution, the tip is located at the distal end of the tubular stent, and the tip can connect the distal end of the tubular stent into a whole. By providing a imaging component on the tip, the imaging component can achieve clear imaging of the distal end of the catheter under medical imaging equipment, so that doctors can accurately grasp the position and status of the catheter in the body.
[0022] In some embodiments, the ablation catheter further includes a central wire that is movably inserted through the catheter and the tubular stent. The distal end of the central wire is connected to the tip end, and the proximal end of the central wire is inserted through the tubular stent and the catheter and connected to the handle. The central wire is used to control the tubular stent to switch between a contracted state and an expanded state.
[0023] In the above technical solution, the proximal end of the central wire is connected to the handle, and the distal end is connected to the head end. The central wire is controlled by the handle, and the central wire can drive the head end to pull the tubular stent towards the catheter direction, so that the tubular stent switches from a contracted state to an expanded state, thereby achieving the adhesion of the electrodes on the tubular stent to the wall.
[0024] Secondly, embodiments of this application also provide an ablation device, which includes the ablation catheter of any of the foregoing embodiments.
[0025] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description
[0026] 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.
[0027] Figure 1 This is a schematic diagram of a tubular support structure in the prior art after being unfolded on a circumferential surface.
[0028] Figure 2 This is a schematic diagram showing the unfolded circumferential surface of an existing tubular support where electrodes are positioned at intersections.
[0029] Figure 3 This is a schematic diagram of the structure of the ablation catheter provided in some embodiments of this application;
[0030] Figure 4 This is a schematic diagram of the structure of the mesh-like stent of the ablation catheter provided in some embodiments of this application;
[0031] Figure 5 A schematic diagram showing the unfolded circumferential surface of a mesh-like scaffold with eighteen scaffold wires provided in some embodiments of this application;
[0032] Figure 6 A schematic diagram showing the unfolded circumferential surface of a mesh-like scaffold with twelve scaffold wires provided in some embodiments of this application.
[0033] Figure 7 A schematic diagram showing the unfolded circumferential surface of a mesh-like scaffold with ten scaffold wires provided in some embodiments of this application.
[0034] Figure 8 A schematic diagram showing the unfolded circumferential surface of a mesh-like support with ten support wires in some other embodiments of this application;
[0035] Figure 9 A schematic diagram of the circumferential surface unfolding of a mesh-like scaffold with ten scaffold wires provided in some embodiments of this application;
[0036] Figure 10 A schematic diagram of the circumferential surface unfolding of a mesh-like scaffold with eight scaffold wires provided in some embodiments of this application;
[0037] Figure 11 A schematic diagram showing the unfolded circumferential surface of a mesh-like support provided in some embodiments of this application after the axial distance between two adjacent electrodes is increased;
[0038] Figure 12 This is a schematic diagram of the structure of the ablation catheter provided in some embodiments of this application before assembly, where the electrode is a sheet electrode with a bent portion;
[0039] Figure 13 This is a schematic diagram of the structure of the ablation catheter provided in some embodiments of this application, showing the assembled sheet electrode with a bent portion.
[0040] Icons: 100-Ablation catheter; 10-Network stent; 11-First stent wire; 12-Second stent wire; 13-Overlapping portion; 14-Proximal end; 15-Distal end; 20-Electrode; 210-Main body; 211-Bending portion; 30-Head end; 40-Catheter; 50-Center wire; 60-Handle; 200-Positive spiral stent wire; 201-Negative spiral stent wire. Detailed Implementation
[0041] 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.
[0042] 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.
[0043] 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.
[0044] 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.
[0045] 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.
[0046] In related technologies, such as Figure 1 As shown, Figure 1 This is a schematic diagram of a tubular support structure as unfolded on a circumferential surface in the prior art. The tubular support structure is formed by multiple positive spiral support wires 200 and negative spiral support wires 201 interlaced to form a mesh shape. Electrodes 20 are generally mounted on either the positive spiral support wire 200 or the negative spiral support wire 201 on the same side. Figure 1The diagram illustrates the configuration of multiple electrodes mounted on positive helical stent wires 200. Since the tubular stent is formed by interlacing positive and negative helical stent wires 200 and 201, to avoid over-ablation, the multiple electrodes 20 do not overlap axially and are spirally distributed on multiple positive helical stent wires 200. Because the interlaced helical stent wires on both sides of the electrode 20 are arranged in an up-down pattern, in actual vascular environments, the helical stent wire running on one side of the electrode 20 may slip onto the electrode 20, obstructing it and preventing proper adhesion to the vessel wall. Increasing the mesh spacing can reduce the probability of helical stent wires slipping onto the electrode 20 and obstructing it, but the overall stability of the tubular structure will decrease (a denser mesh results in a more stable morphology, while a sparser mesh results in a less stable morphology).
[0047] like Figure 2 As shown, Figure 2 This is a schematic diagram showing the unfolded circumferential surface of an electrode in a mesh-like support structure in the prior art after it is positioned at an intersection. If the electrode 20 is positioned at the intersection of the mesh, to ensure a low risk of the electrode 20 being obscured by the support wires, the electrodes 20 must be arranged in the same axial position. If multiple electrodes 20 do not overlap axially, it will inevitably lead to the electrode 20 being obscured by the spiral support wires. Figure 2 The diagram illustrates a situation where the electrode is positioned at the intersection but is obscured by the negative spiral support wire 201.
[0048] Therefore, this application provides an ablation catheter, please refer to... Figures 3 to 10 The ablation catheter 100 includes a catheter 40, a tubular stent 10, and an electrode 20. The tubular stent 10 includes multiple first stent wires 11 arranged alternately and sequentially, and multiple second stent wires 12 arranged alternately and sequentially. Each first stent wire 11 alternately overlaps with multiple second stent wires 12, and each second stent wire 12 alternately overlaps with multiple first stent wires 11. The intersections of the first stent wires 11 and the second stent wires 12 form several overlapping portions 13. The two ends of the first stent wire 11 and multiple second stent wires 12 converge to form the distal end 15 and proximal end 14 of the tubular stent 10, respectively. 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. 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.
[0049] In this scheme, 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. 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 risk of the electrode 20 being blocked by the first support wire 11 and the second support wire 12, and facilitates better adhesion of the electrode 20 to the wall, resulting in a better ablation effect.
[0050] 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.
[0051] 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.
[0052] The mesh-like scaffold 10 is a mesh structure formed by interlacing multiple first scaffold wires 11 and second scaffold wires 12. 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.
[0053] 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.
[0054] 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.
[0055] 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 constitute the proximal and distal ends of the tubular support, respectively. The main body segment is the main part of the tubular support. Figures 4 to 10 The diagram shown is a partial (main section) circumferential unfolded schematic of a tubular scaffold.
[0056] In some embodiments, please refer to Figure 3 The device employs multiple electrodes 20, which are spaced apart both circumferentially and axially when the tubular stent 10 is in an expanded state. This spacing ensures that the electrodes 20 do not overlap in either direction, reducing the risk of over-ablation and resulting in a more uniform and effective ablation zone. Furthermore, the 360° circumferential spacing of the electrodes 20 on the tubular stent 10 allows for full-quadrant ablation of the target ablation area.
[0057] 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.
[0058] The number of electrodes 20 can be two, four, six, or eight, depending on the specific circumstances. In this embodiment, there are six electrodes 20, which are evenly spaced around the circumference of the tubular support 10 and also spaced apart along the axial direction of the tubular support 10.
[0059] In some embodiments, please refer to Figure 11 , Figure 11 The diagram illustrates a portion of the expanded circumferential surface of the tubular support 10 after the axial distance between two adjacent electrodes 20 is increased, showing the case 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 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, the distance between two adjacent electrodes 20 is not less than at least twice the distance between two adjacent overlapping portions 13. This 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.
[0060] It should be noted that when the ablation catheter 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.
[0061] In this embodiment, the distance between two adjacent electrodes 20 is not less than twice the distance between two adjacent overlapping portions 13.
[0062] In some embodiments, please refer to Figures 5 to 10Along the circumference 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 located on the outermost side of the overlap portion 13 of the first support wire 11 and the second support wire 12. Furthermore, it 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 electrode 20.
[0063] 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 electrode positions, 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 electrode distribution is more flexible and can be determined according to actual conditions, thus having a wider range of applications.
[0064] In some embodiments, please refer to Figures 6 to 10 The sum of the number of the first support wire 11 and the second support wire 12 is at least greater than four. The sum of the number of the first support wire 11 and the second support wire 12 can be 4-32. Preferably, the sum of the number of the first support wire 11 and the second support wire 12 is an even number. The sum of the number of the first support wire 11 and the second support wire 12 can be six, eight, ten, twelve, or eighteen.
[0065] For example, please refer to Figure 5 , Figure 5 This diagram illustrates a partial view of the expanded circumferential surface of a tubular scaffold with eighteen scaffold wires, specifically showing only the main body of the tubular scaffold. With eighteen scaffold wires in the tubular scaffold 10 and six electrodes 20 (meaning nine scaffold wires for both the first scaffold 11 and the second scaffold 12), the six electrodes 20 can be labeled from top left to bottom right on the expanded circumferential surface of the tubular scaffold as #1 electrode 20 to #6 electrode 20. The six electrodes 20 are arranged in a straight line on the expanded circumferential surface of the tubular scaffold 10.
[0066] For example, please refer to Figure 6 , Figure 6This diagram illustrates a partial view of the expanded circumferential surface of a tubular scaffold with twelve scaffold wires in its expanded state; specifically, it only shows the circumferential expansion of the main body of the tubular scaffold. When the tubular scaffold 10 has twelve scaffold wires and six electrodes 20 (meaning both the first scaffold wire 11 and the second scaffold wire 12 have six wires), the six electrodes 20 can be labeled sequentially from top left to bottom right on the expanded diagram of the tubular scaffold as #1 electrode 20 to #6 electrode 20. The six electrodes 20 are arranged in two straight lines on the expanded circumferential surface of the tubular scaffold 10. One line contains four electrodes 20, and the other line contains two electrodes 20.
[0067] For example, please refer to Figure 7 , Figure 8 and Figure 9 This diagram illustrates a partial unfolded view of the circumferential surface of a tubular scaffold with ten scaffold wires, specifically showing only the unfolded circumferential surface of the main segment of the tubular scaffold. When the tubular scaffold 10 has ten scaffold wires and six electrodes 20 (i.e., five first scaffold wires 11 and five second scaffold wires 12), the six electrodes 20 can be labeled #1 to #6 on the unfolded view of the tubular scaffold, from top left to bottom right. The six electrodes 20 are arranged in two straight lines on the unfolded circumferential surface of the tubular scaffold 10. One line contains three electrodes 20, and the other line contains three electrodes 20.
[0068] It should be noted that, Figure 7 , Figure 8 or Figure 9 The number of electrodes shown in the image is seven, but in reality... Figure 7 , Figure 8 or Figure 9 The diagram shows six electrodes, but due to the unfolded view of the circumferential surface of the tubular support, the electrodes appear to be cut into two parts, shown on the top and bottom sides of the attached diagram, creating the illusion of a mismatch in the number of electrodes. Figure 7 For example, Figure 7 The two electrodes on the upper and lower sides of the middle part are actually the same electrode. Figure 8 and Figure 9 The two electrodes on the right side of the image are actually the same electrode.
[0069] For example, please refer to Figure 10The diagram shows a partial unfolded view of the circumferential surface of a tubular scaffold with eight scaffold wires, specifically showing only the unfolded circumferential surface of the main segment of the tubular scaffold. When the tubular scaffold 10 has eight scaffold wires and six electrodes 20 (meaning the first scaffold wire 11 and the second scaffold wire 12 each have four wires), the six electrodes 20 can be labeled sequentially from top left to bottom right on the unfolded diagram of the tubular scaffold as #1 electrode 20 to #6 electrode 20.
[0070] It should be noted that, Figures 5 to 10 This diagram shows the circumferential development of the main body segment of a tubular scaffold with different numbers of scaffold wires. To better understand the specific logic behind the number of scaffold wires in this design, [the following is a diagram showing the circumferential development of the main body segment of a tubular scaffold with different numbers of scaffold wires]. Figure 10 For example, Figure 10 The number of the first support wire is four, and the number of the second support wire 12 is also four. Figure 10 The two second support wires pointed to by the two ends of the dotted line are actually the same second support wire. Because the mesh-like support is cut along the axial direction, the same second support wire is cut into two segments. Figures 5 to 9 The number of support wires can be calculated in the same way.
[0071] 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.
[0072] In this embodiment, the mesh shape formed by the first support wire 11 and the second support wire 12 is rhomboid.
[0073] 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.
[0074] In some embodiments, the electrode 20 is a sheet electrode, comprising a main body 210 and a plurality of bent portions 211. The plurality of bent portions 211 are distributed at least on opposite sides of the main body 210, and the plurality of bent portions 211 can be bent relative to the main body 210 toward the same side in the direction of the center of the main body and then abut against each other. By providing bendable bent portions 211 on the main body 210, when connecting the electrode 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 the electrode 20 around the first support wire 11 or the second support wire 12 at the overlapping portion 13, making the installation of the electrode 20 convenient and quick.
[0075] like Figure 12 As shown, before assembly, the bent portion 211 of the sheet electrode is in the same plane as the main body 210. Figure 13 As shown, multiple bending portions 211 are bent towards the center of the main body 210, and the orthographic projection of the bending portions 211 falls on the orthographic projection of the main body 210 in the thickness direction. The sheet electrode can be wrapped around the first support wire 11 or the second support wire 12 by the multiple bending 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.
[0076] In some embodiments, please refer to Figure 4 The ablation catheter 100 also includes a tip 30, which is disposed at the distal end 15 of the tubular stent 10 and is equipped with a contrast-enhancing component. The tip 30, located at the distal end 15 of the tubular stent 10, can connect the distal end 15 of the tubular stent 10 into 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 catheter's position and status within the body.
[0077] 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.
[0078] In some embodiments, please refer to Figure 3 and Figure 4 The ablation catheter 100 also includes a central wire 50, which is movably inserted through the catheter 40 and the tubular stent 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 stent 10 and the catheter 40 and connected to the handle 60. The central wire 50 is used to control the switching of the tubular stent 10 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 stent 10 towards the catheter 40, so that the tubular stent 10 switches from a contracted state to an expanded state, thereby achieving the adhesion of the electrode 20 on the tubular stent 10 to the wall.
[0079] This application also provides an ablation device, which includes an ablation catheter 100 and an ablation host.
[0080] 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.
[0081] The ablation catheter 100 provided in this embodiment is not limited to the applications listed above in clinical treatment, but can also be used for nerve ablation in other locations.
[0082] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.
[0083] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. An 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.
2. The ablation catheter according to claim 1, 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.
3. The ablation catheter according to claim 2, 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.
4. The ablation catheter according to claim 2, 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.
5. The ablation catheter according to claim 4, 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.
6. The ablation catheter according to claim 1, characterized in that, The number of the first support wire and the number of the second support wire are equal.
7. The ablation catheter according to claim 1, 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.
8. The ablation catheter according to claim 1, characterized in that, The sum of the number of the first support wire and the second support wire is at least four.
9. The ablation catheter according to claim 1, 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.
10. The ablation catheter according to claim 9, characterized in that, The ablation catheter also includes: A central wire is movably inserted through the catheter and the tubular support. The distal end of the central wire is connected to the head end, and the proximal end of the central wire is inserted through the tubular support and the catheter and connected to the handle. The central wire is used to control the tubular support to switch between a contracted state and an expanded state.
11. An ablation device, characterized in that, Includes the ablation catheter according to any one of claims 1-10.