Ablation assembly and ablation catheter

Abstract

The embodiment of the utility model provides an ablation assembly and an ablation catheter, and belongs to the technical field of ablation. The ablation assembly comprises an electrode and an electrode support capable of contracting and expanding in the radial direction, the electrode support is of a latticed structure formed by sequentially connecting a plurality of unit grids, and the two ends of the electrode support are gathered together to form the far end and the near end of the electrode support respectively. The electrode is fixedly arranged on the electrode support. The ablation assembly can solve the problem that the electrode is shielded by the support wire of the electrode support, and the ablation effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ablation technology, in particular, to an ablation assembly and an ablation catheter. BACKGROUND

[0002] Catheter ablation is used for the treatment of various arrhythmias, tumors and the like. The ablation catheter plays a role of energy transmission and target lesion positioning in the operation, and is a tool for implementing ablation.

[0003] In the ablation catheter, the electrode is mounted on the electrode support at the distal end of the ablation catheter, the electrode support is used to carry the electrode and expand to adhere to the wall before ablation starts and retract after ablation ends. However, for multiple electrodes on the electrode support, during the expansion and deformation of the electrode support, the support wire of the electrode support may be displaced accordingly, there is a risk that the electrode is blocked by the support wire of the electrode support, affecting the ablation effect. CONTENT OF THE UTILITY MODEL

[0004] The embodiments of the present application provide an ablation assembly and an ablation catheter, which can solve the problem that the electrode is blocked by the support wire of the electrode support and improve the ablation effect.

[0005] In a first aspect, the embodiments of the present application provide an ablation assembly, which comprises an electrode and an electrode support that can be radially retracted and expanded, the electrode support is a grid-shaped structure formed by a plurality of unit grids connected in sequence, the two ends of the electrode support are gathered to form a distal end and a proximal end of the electrode support respectively; the electrode is fixedly arranged on the electrode support.

[0006] In the present scheme, the electrode support is a grid-shaped structure formed by a plurality of unit grids connected in sequence, a plurality of intersection points are formed between adjacent two unit grids, and each intersection point has a constraint effect on the deformation of each unit grid. After the electrode is arranged on the unit grid of the electrode support, in the process of radial expansion and deformation of the electrode support, under the constraint effect of the intersection points, the support wire in each unit grid will not have a relative sliding phenomenon, but the support wire in the unit grid will expand and deform as a whole with the electrode support, so that the electrode will not be blocked by the support wire in the unit grid on the electrode support, and the ablation effect of the ablation assembly is ensured.

[0007] In some embodiments, at least one unit grid of the plurality of unit grids is provided with a fixing assembly for mounting the electrode, the fixing assembly comprises a first fixing wire, one end of the first fixing wire is connected with the unit grid, the other end of the first fixing wire is a free end, the first fixing wire is used for the electrode to pass through, and the electrode is fixedly connected with the first fixing wire.

[0008] In the technical solution, the first fixed wire of the fixed assembly has a free end. When the electrode is installed, the electrode is inserted into the free end of the first fixed wire, and the electrode is fixed on the first fixed wire. On the one hand, the electrode is fixed on the electrode support by the insertion and fixing mode, and the installation of the electrode is simple and fast, and the installation difficulty of the electrode is reduced. On the other hand, compared with the continuous state of the support wire of the electrode support in the prior art, the electrode can be fixed on the outside of the support wire of the electrode support only by the adhesive or welding mode. The first fixed wire and the electrode are combined into one, the first fixed wire provides the fixing and supporting function for the electrode, the electrode is not easy to be separated from the first fixed wire, and the installation stability of the electrode on the electrode support is improved.

[0009] In some embodiments, the unit grid comprises a first support wire, a second support wire, a third support wire and a fourth support wire connected 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 fixed wire is connected to the midpoint of the first support wire, and the free end of the first fixed wire points to the midpoint of the third support wire.

[0010] In the technical solution, the first support wire, the second support wire, the third support wire and the fourth support wire enclose the unit grid, one end of the first fixed wire is connected to the midpoint of the first support wire, and the free end of the first fixed wire points to the center area of the unit grid. In this way, the electrode has sufficient space to be inserted into the free end of the first fixed wire, and after the electrode is fixed on the first fixed wire, the electrode has a certain distance from the first support wire, the second support wire, the third support wire and the fourth support wire in the unit grid, and the electrode is not easy to be interfered by each support wire in the unit grid.

[0011] In some embodiments, the fixed assembly further comprises a second fixed wire, one end of the second fixed wire is connected to the midpoint of the third support wire, the other end of the second fixed wire points to the midpoint of the first support wire, and the second fixed wire is parallel to and attached to the first fixed wire; along the length direction of the first fixed wire or the second fixed wire, the first fixed wire and the second fixed wire have an overlapping part, the electrode is inserted into and fixedly connected to the overlapping part of the first fixed wire and the second fixed wire.

[0012] In the technical solution, the free end of the second fixed wire and the free end of the first fixed wire point in opposite directions, the first fixed wire and the second fixed wire form an overlapping portion, the second fixed wire is arranged in parallel with and in contact with the first fixed wire, the first fixed wire and the second fixed wire are in a continuous state in the length direction of the first fixed wire, the electrode is arranged on the overlapping portion of the first fixed wire and the second fixed wire and connected to the overlapping portion, the first fixed wire and the second fixed wire jointly provide the electrode with bearing and fixing functions, even if the electrode slips in the length direction of the first fixed wire or the second fixed wire, the electrode is not easy to be separated from the first fixed wire or the second fixed wire under the blocking action of the first support wire and the third support wire, and the installation stability of the electrode on the electrode support is further improved.

[0013] In some embodiments, the length of the overlapping portion is not less than half of the distance between the midpoint of the first support wire and the midpoint of the third support wire; the length of the first fixed wire is equal to the length of the second fixed wire.

[0014] In the technical solution, the length of the overlapping portion is not less than half of the distance between the midpoint of the first support wire and the midpoint of the third support wire, so that the length of the overlapping portion is sufficient, and the stability of the electrode installed on the first fixed wire and the second fixed wire is higher. The length of the first fixed wire is equal to the length of the second fixed wire, and the overlapping portion of the first fixed wire and the second fixed wire is located in the middle region of the first support wire and the third support wire, that is, the electrode is installed in the central region of the unit grid, and the electrode has sufficient spacing with the first support wire, the second support wire, the third support wire and the fourth support wire in the unit grid, and the electrode is not easy to be interfered by the support wires of the unit grid.

[0015] In some embodiments, the first fixed wire and the second fixed wire are integrally formed with the unit grid.

[0016] In the technical solution, the first fixed wire and the second fixed wire are integrally formed with the unit grid, the structural stability of the first fixed wire and the second fixed wire is high, the integrity of the electrode support is good, the installation stability requirement of the electrode can be met, and the processing is simple.

[0017] In some embodiments, the plurality of unit grids includes a first unit grid and a second unit grid, and the area of the hollow region of the second unit grid is an integer multiple of the area of the hollow region of the first unit grid.

[0018] In the technical solution, the plurality of unit grids are divided into first unit grids and second unit grids, 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, which is equivalent to locally and specifically reducing the support wires in the plurality of first unit grids on the electrode support, and then obtaining the second unit grid, so that the density of the support wires at the corresponding positions on the electrode support is different, thereby reducing the diameters of the corresponding positions on the electrode support, and the application range is wider.

[0019] In some embodiments, the number of the second unit grids is a plurality, and the plurality of second unit grids are arranged along the circumferential direction and / or the axial direction of the electrode support.

[0020] In the technical solution, the plurality of second unit grids are arranged along the circumferential direction and / or the axial direction of the electrode support, the position distribution of the second unit grids on the electrode support can be designed according to actual conditions, the distribution of the second unit grids is more flexible, and the plurality of second unit grids can meet the installation requirements of multiple electrodes.

[0021] In some embodiments, the number of the electrodes is a plurality, and at least part of the plurality of second unit grids are provided with the fixing assembly.

[0022] In the technical solution, part of the plurality of second unit grids are provided with the fixing assembly, the part of the second unit grids and the fixing assembly can be arranged at the positions on the electrode support where the electrodes need to be arranged, so as to facilitate the wall attachment of the multiple electrodes. Another part of the second unit grids can be distributed in the regions on the electrode support where the diameters are larger or the thermocouple wires are more densely distributed, so that the diameters of the corresponding regions on the electrode support are effectively controlled.

[0023] In a second aspect, the embodiments of the present application further provide an ablation catheter, which comprises a head end, a catheter, a traction wire, and the ablation assembly of any of the preceding embodiments. The head end is connected to the distal end of the electrode support, the catheter is connected to the proximal end of the electrode support, the catheter has a first lumen extending in the axial direction. The traction wire is connected to the head end and movably passes through the first lumen and the electrode support. When the traction wire moves from the distal end to the proximal end, the electrode support switches from the contracted state to the expanded state.

[0024] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative effort based on these drawings.

[0026] Figure 1 The structural schematic diagram of the electrode holder provided in some embodiments of the present application;

[0027] Figure 2 The structural schematic diagram of the electrode holder provided in some embodiments of the present application; Figure 1 The enlarged schematic diagram of the electrode holder in A;

[0028] Figure 3 The structural schematic diagram of the ablation assembly provided in some embodiments of the present application;

[0029] Figure 4 The structural schematic diagram of the ablation catheter provided in some embodiments of the present application;

[0030] Figure 5 The structural schematic diagram of the electrode as a tubular electrode in the ablation assembly provided in some embodiments of the present application;

[0031] Figure 6 The structural schematic diagram of the electrode as a tubular electrode in the ablation assembly provided in some embodiments of the present application;

[0032] Figure 7 The structural schematic diagram of the electrode as a sheet-shaped electrode with a bending part before assembly in the ablation assembly provided in some embodiments of the present application;

[0033] Figure 8 The structural schematic diagram of the electrode as a sheet-shaped electrode with a bending part after assembly in the ablation assembly provided in some embodiments of the present application.

[0034] Figure: 100-ablation assembly; 10-electrode holder; 11-unit grid; 111-first unit grid; 112-second unit grid; 113-first holder wire; 114-second holder wire; 115-third holder wire; 116-fourth holder wire; 12-proximal end; 13-distal end; 20-electrode; 210-main body part; 211-bending part; 30-fixing assembly; 31-first fixing wire; 32-second fixing wire; 33-overlapping part; 200-ablation catheter; 201-head end; 202-catheter; 203-pulling wire. DETAILED DESCRIPTION

[0035] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work under the premise that the scope of protection of the present application.

[0037] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0038] In the description of the embodiments of the present application, it should be noted that the indicated position or location relationship is based on the position or location relationship shown in the drawings, or the position or location relationship commonly placed when the product of the application is used, only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the indicated device or element must have a particular position, be constructed and operated in a particular position, therefore, it cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "connected" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected, can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] Embodiments

[0041] There are many types of electrode supports. For example, for a multi-electrode mesh tube electrode support, the multi-electrodes are loaded on a mesh tube formed by interlaced weaving of positive and negative helical support wires. The mesh tube forms a stable grid through the up-and-down interlacing of the positive and negative wires, so that the mesh tube support can be expanded in a blood vessel of different diameter specifications and complex running tortuosity. However, since the support wires in the mesh tube are interlaced in the form of a mesh tube formed by interlaced weaving of positive and negative helical wires, the electrodes are generally loaded on the same side of the helical support wires. To avoid transition ablation, the multi-electrodes are axially non-overlapping and are helically distributed on the support wires. Since the interlaced support wires on both sides of the electrodes are one above the other, the support wires on one side of the electrodes in the actual blood vessel environment slide onto the electrodes, thereby shielding the electrodes and causing the electrodes to fail to adhere to the wall, which affects the ablation effect.

[0042] In view of this, an ablation assembly is provided in the embodiments of the present application, please refer to Figure 1 、 Figure 2 and Figure 3 , the ablation assembly 100 includes an electrode 20 and an electrode support 10 which can be radially contracted and expanded, the electrode support 10 is a mesh structure formed by sequentially connecting a plurality of unit meshes 11, and the two ends of the electrode support 10 are gathered to form a distal end 13 and a proximal end 12 of the electrode support respectively; the electrode 20 is fixedly arranged on the unit mesh 11 of the electrode support 10.

[0043] In the present scheme, the electrode support 10 is a mesh structure formed by sequentially connecting a plurality of unit meshes 11, a plurality of intersection points are formed between adjacent two unit meshes 11, and each intersection point has a constraint effect on the deformation of the support wires in each unit mesh 11. After the electrode 20 is arranged on the unit mesh 11 of the electrode support 10, in the process of radial expansion and deformation of the electrode support 10, under the constraint effect of the intersection points, the support wires in each unit mesh 11 will not appear relative slipping phenomenon, but the support wires in the unit mesh 11 will expand and deform as a whole with the electrode support 10, so that the electrode 20 will not be shielded by the support wires in the unit mesh 11 of the electrode support 10, and the ablation effect of the ablation assembly 100 is ensured.

[0044] The electrode support 10 can be made of metal pipe material / high polymer pipe material by cutting, laser engraving and precise powder metallurgy, and then expanded by a jig and heated to set the shape. The temperature of different materials is different.

[0045] The shapes of each unit mesh 11 in the electrode support 10 can be the same or different. In the present embodiment, the shapes of each unit mesh 11 in the electrode support 10 are completely the same. Further, the areas of each unit mesh 11 can be equal or different, which is determined according to the actual situation.

[0046] In some embodiments, at least one of the plurality of unit grids 11 is provided with a fixing assembly 30 for mounting the electrode 20, the fixing assembly 30 comprising a first fixing wire 31, one end of the first fixing wire 31 being connected to the unit grid 11, the other end of the first fixing wire 31 being a free end, the first fixing wire 31 being used for threading the electrode 20, and the electrode 20 being fixedly connected to the first fixing wire 31.

[0047] In the above technical solution, at least one of the plurality of unit grids 11 is provided with a fixing assembly 30 for mounting the electrode 20, and the first fixing wire 31 in the fixing assembly 30 has a free end. When the electrode 20 is mounted, the electrode 20 is threaded from the free end of the first fixing wire 31 and is fixed on the first fixing wire 31. On the one hand, the electrode 20 is fixed on the electrode support 10 by threading and fixing, and the mounting method of the electrode 20 is simple and fast, which reduces the installation difficulty of the electrode 20. On the other hand, compared with the continuous state of the support wire of the electrode support in the prior art, the electrode 20 can only be fixed on the outside of the support wire of the electrode support by adhesion or welding. In this solution, the first fixing wire 31 is combined with the electrode 20 by threading, the electrode 20 is integrated with the first fixing wire 31, the first fixing wire 31 provides fixation and support for the electrode 20, the electrode 20 is not easy to be separated from the first fixing wire 31, and the installation stability of the electrode 20 is improved.

[0048] At least one of the plurality of unit grids 11 is provided with a fixing assembly 30, which means that only one of the plurality of unit grids 11 can be provided with a fixing assembly 30, or a plurality of unit grids 11 can be provided with a fixing assembly 30, which can be determined according to the number of electrodes 20.

[0049] When the ablation catheter 200 is a multi-electrode 20, then the plurality of unit grids 11 of the electrode support 10 is provided with a fixing assembly 30, and each unit grid 11 is provided with a fixing assembly 30. One fixing assembly 30 can be used to mount and fix one electrode 20, that is, the number of fixing assemblies 30 is not less than the number of electrodes 20. The setting position of the fixing assembly 30 in the plurality of unit grids 11 can be adaptively selected according to the arrangement position of the electrode 20 on the electrode support 10, which can be determined according to the actual situation, and here it is not limited.

[0050] The material of the first fixing wire 31 can be the same as that of the unit grid 11. The unit grid 11 is surrounded by a plurality of support wires, and the number of support wires is determined according to the shape of the unit grid 11. When the shape of the unit grid 11 is a rhombus, the number of support wires of each unit grid 11 is four.

[0051] The connection point of the first fixed wire 31 and the unit grid 11 can be determined according to actual conditions. For example, the connection point of the first fixed 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 of the first fixed wire 31 and the unit grid 11 can also be located at any position in the length direction of the support wire of the unit grid 11, such as the midpoint of the length direction of the electrode 20 wire of the unit grid 11. Whether the first fixed wire 31 is connected with the intersection of the support wire in the unit grid 11 or the midpoint of the support wire of the unit grid 11, the free end of the first fixed wire 31 needs to be directed towards the center of the area enclosed by the unit grid 11, so that the free end of the first fixed wire 31 has a certain spacing with each support wire in the unit grid 11, which facilitates the electrode 20 to be arranged on the first fixed wire 31, and the electrode 20 has a certain gap with each support wire of the unit grid 11, so that the electrode 20 is not easy to interfere with the unit grid 11.

[0052] After the electrode 20 is arranged on the first fixed wire 31, the electrode 20 can be fixedly connected with the first fixed wire 31 by means of adhesive, welding or the like. In this way, the electrode 20 is not only combined with the first fixed wire 31 of the electrode support 10 under the action of adhesive or welding, but also cooperates with the first fixed wire 31, which further improves the stability of the electrode 20 installed on the electrode support 10. The electrode 20 is provided with a thermocouple wire, which is arranged in the lumen of the catheter 202 along the electrode support 10 and connected with the handle.

[0053] In order to further improve the installation stability of the electrode 20 on the first fixed wire 31 and avoid the phenomenon that the electrode 20 slips off the first fixed wire 31, a stop structure (not shown in the figure) can be arranged at the free end of the first fixed wire 31. The stop structure can have a certain deformation ability, for example, the stop structure can be a metal spring. Of course, the stop structure can be an arc-shaped protruding structure formed by the free end of the first fixed wire 31. When the electrode 20 is arranged, the lumen of the electrode 20 extrudes the stop structure to deform, and then the electrode 20 is arranged on the first fixed wire 31, and then the electrode 20 is fixed by adhesive or welding. Even if the connection point of the electrode 20 and the first fixed wire 31 loosens, the electrode 20 will not be separated from the first fixed wire 31 under the action of the stop structure, which further improves the stability of the electrode 20 installed on the electrode support 10.

[0054] In some embodiments, please refer to Figure 1 and Figure 2The unit grid 11 comprises the first support wire 113, the second support wire 114, the third support wire 115 and the fourth support wire 116 connected 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 fixed wire 31 is connected to the midpoint of the first support wire 113, and the free end of the first fixed 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 enclose the unit grid 11. The one end of the first fixed wire 31 is connected to the midpoint of the first support wire 113, and the free end of the first fixed wire 31 points to the midpoint of the third support wire 115. That is, the free end of the first fixed wire 31 points to the center area of the unit grid 11. In this way, the electrode 20 has sufficient space to pass through the free end of the first fixed wire 31, and after the electrode 20 is fixed on the first fixed 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, so that the electrode 20 is not easily interfered by each support wire in the unit grid 11.

[0055] Of course, one end of the first fixed 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. In this case, the free end of the first fixed wire 31 points to the midpoint of the fourth support wire 116, the first support wire 113 or the second support wire 114.

[0056] In some embodiments, the fixing assembly 30 further comprises a second fixing wire 32, one end of the second fixing wire 32 is connected to the midpoint of the third support wire 115, the other end of the second fixing wire 32 points to the midpoint of the first support wire 113, the second fixing wire 32 is arranged in parallel and close to the first fixing wire 31; 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 part 33, and the electrode 20 is arranged on the overlapping part 33 of the first fixing wire 31 and the second fixing wire 32. Through the arrangement of the second fixing wire 32, the free end of the second fixing wire 32 and the free end of the first fixing wire 31 point in opposite directions, the first fixing wire 31 and the second fixing wire 32 form an overlapping part 33, the second fixing wire 32 is arranged in parallel and close to the first fixing wire 31, the first fixing wire 31 and the second fixing wire 32 are approximately in a continuous state in the length direction of the first fixing wire 31, after the electrode 20 is arranged on the overlapping part 33 of the first fixing wire 31 and the second fixing wire 32, the first fixing wire 31 and the second fixing wire 32 together provide a bearing and fixing effect 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 be separated 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, further improving the installation stability of the electrode 20 installed on the electrode support 10.

[0057] Specifically, the material of the first fixing wire 31 and the second fixing wire 32 can be the same as that of the unit grid 11, and the first fixing wire 31 and the second fixing wire 32 can be resiliently bent and deformed. When installing the electrode 20, the first fixing wire 31 can be lifted upward and staggered with the second fixing wire 32, the electrode 20 is arranged on the first fixing wire 31, and then the second fixing wire 32 is arranged on the other end of the electrode 20. The electrode 20 is arranged on the overlapping part 33 of the first fixing wire 31 and the second fixing wire 32. Then the electrode 20 is fixedly connected with the first fixing wire 31 and the second fixing wire 32, for example, the electrode 20 can be fixed by using adhesive or welding.

[0058] The length of the first fixing wire 31 and the second fixing wire 32 can be equal or not equal. In addition, the length of the overlapping part 33 of the first fixing wire 31 and the second fixing wire 32 can be determined according to the actual situation, the longer the length of the overlapping part 33 of the first fixing wire 31 and the second fixing wire 32, the higher the stability of the electrode 20 installed on the first fixing wire 31 and the second fixing wire 32, but when the length of the overlapping part 33 of the first fixing wire 31 and the second fixing wire 32 is too large, it will increase the difficulty of arranging the electrode 20 on the first fixing wire 31 and the second fixing wire 32. Therefore, the length of the overlapping part 33 of the first fixing wire 31 and the second fixing wire 32 can be reasonably selected according to the actual situation.

[0059] In some embodiments, referring to Figure 2 , the length of the overlapping portion 33 is not less than half of the distance between the midpoint of the first support wire 113 and the midpoint of the third support wire 115. By making the length of the overlapping portion 33 not less than half of the distance between the midpoint of the first support wire 113 and the midpoint of the third support wire 115, the length of the overlapping portion 33 is sufficient to make the stability of the electrode 20 mounted on the first fixed wire 31 and the second fixed wire 32 higher.

[0060] The length of the overlapping portion 33 not less than half of the distance between the midpoint of the first support wire 113 and the midpoint of the third support wire 115 means that the length of the overlapping portion 33 can be one half, two thirds, or five thirds of the distance between the midpoint of the first support wire 113 and the midpoint of the third support wire 115.

[0061] In some embodiments, referring to Figure 2 , the length of the first fixed wire 31 is equal to the length of the second fixed wire 32. By making the length of the first fixed wire 31 equal to the length of the second fixed wire 32, the overlapping portion 33 of the first fixed wire 31 and the second fixed wire 32 is located in the middle region of the first support wire 113 and the third support wire 115, that is, the electrode 20 is mounted in the central region of the unit grid 11, and the electrode 20 has sufficient spacing with 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, so that the electrode 20 is not easily interfered by the support wires of the unit grid 11.

[0062] In some embodiments, the first fixed wire 31 and the second fixed wire 32 are integrally formed with the unit grid 11. By integrally forming the first fixed wire 31 and the second fixed wire 32 with the unit grid 11, the structure of the first fixed wire 31 and the second fixed wire 32 is stable, the integrity of the electrode support 10 is good, the mounting stability requirement of the electrode 20 can be met, and the processing is simple.

[0063] In some embodiments, the plurality of unit grids 11 includes a first unit grid 111 and a second unit grid 112, and the area of the hollowed region of the second unit grid 112 is an integer multiple of the area of the hollowed region of the first unit grid 111. Dividing the plurality of unit grids 11 into the first unit grid 111 and the second unit grid 112, and the area of the hollowed region of the second unit grid 112 being an integer multiple of the area of the hollowed region of the first unit grid 111, is equivalent to locally and selectively reducing the number of support wires in the region enclosed by the plurality of first unit grids 111 on the electrode support 10, thereby obtaining the second unit grid 112. In the case of meeting the overall stability of the electrode support 10, the density of the support wires at the corresponding position on the electrode support 10 is different, the diameter of the corresponding position on the electrode support 10 is reduced, so that a smaller guide catheter can be adapted, which not only has a wider range of application, but also makes the wound smaller.

[0064] The area of the hollowed region of the second unit grid 112 is an integer multiple of the area of the hollowed region of the first unit grid 111. The area of the hollowed region of the second unit grid 112 can be twice, four times or eight times the area of the hollowed region of the first unit grid 111, etc., which can be determined according to actual conditions.

[0065] It can be understood that the diameter of the distal end 13 of the electrode support 10 is relatively smaller because of the fewer number of thermocouple wires. The position of the proximal end 12 of the electrode support 10 is relatively larger in diameter because of the electrode 20 and the larger number of thermocouple wires of the electrode 20. Therefore, a part of the plurality of second unit grids 112 can be distributed on the electrode support 10 at a position close to the proximal end 12 of the electrode support 10 to reduce the diameter of the proximal end 12 of the electrode support 10. Another part of the plurality of second unit grids 112 can be distributed on the electrode support 10 at a position required for installation of the electrode 20.

[0066] In some embodiments, the first unit grid 111 and the second unit grid 112 can be parallelograms.

[0067] Further, please refer to Figure 1 and Figure 2The shapes of the first unit grid 111 and the second unit grid 112 are both diamond-shaped, and the area of the second unit grid 112 is four times the area of the first unit grid 111. In the case where the shapes of the first unit grid 111 and the second unit grid 112 are the same, the area of the second unit grid 112 is four times the area of the first unit grid 111, so that the span between two adjacent support wires in the second unit grid 112 is larger, the distribution of the support wires is more dispersed, the diameter of the area on the electrode support 10 where the second unit grid 112 is distributed is relatively smaller, the diameter of the corresponding position of the electrode support 10 is reduced, so that a smaller guide catheter can be adapted, not only the application range is wider, but also the trauma wound is smaller.

[0068] In the case 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, and the shapes of the first unit grid 111 and the second unit grid 112 are both diamond-shaped, it can be understood 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.

[0069] In actual manufacturing, the support wires at the local position of the electrode support 10 are removed, and for example, the area surrounded by four first unit grids 111 is reduced, that is, the support wires at the middle position in the area surrounded by the four first unit grids 111 are removed, so that the middle area surrounded by the four first unit grids 111 is completely hollowed out, so that the four first unit grids 111 form a second unit grid 112 with a larger hollowed-out area, and 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. In the case of the same area, the support wires of the second unit grid 112 are more dispersed than the support wires of the first unit grid 111.

[0070] In some embodiments, the number of second unit grids 112 is multiple, and the multiple second unit grids 112 are arranged along the circumferential direction and / or the axial direction of the electrode support 10. Arranging multiple second unit grids 112 along the circumferential direction and / or the axial direction of the electrode support 10 can design the position distribution of the second unit grid 112 on the electrode support 10 according to the actual situation, and the distribution of the second unit grid 112 is more flexible. Moreover, the multiple second unit grids 112 can meet the installation requirements of the multi-electrode 20.

[0071] The plurality of second unit grids 112 are arranged along the circumferential direction and / or the axial direction of the electrode holder 10, which means that the plurality of second unit grids 112 can be distributed along the axial direction of the electrode holder 10, or can be distributed along the circumferential direction of the electrode holder 10, or can be arranged along the circumferential direction and the axial direction of the electrode holder 10. In this embodiment, the plurality of second unit grids 112 are arranged along the circumferential direction and the axial direction of the electrode holder 10.

[0072] In some embodiments, the number of electrodes 20 is a plurality, and at least part of the plurality of second unit grids 112 are provided with the fixing assembly 30. The fixing assembly 30 is arranged in part of the plurality of second unit grids 112, and the part of the second unit grids 112 and the fixing assembly 30 can be arranged at the position of the electrode holder 10 where the electrode 20 needs to be arranged, so as to facilitate the wall attachment of the plurality of electrodes 20. Another part of the second unit grids 112 can be distributed in the area with larger diameter or more densely distributed thermocouple wires on the electrode holder 10, so that the diameter of the corresponding area on the electrode holder 10 is effectively controlled.

[0073] The shape of the electrode 20 can be various, for example, the shape of the electrode 20 can be a tubular electrode, or can be a sheet-shaped electrode. Figure 5 The case where the electrode is a tubular electrode is shown, Figure 6 The case where the electrode is an elliptical tubular electrode is shown.

[0074] When the electrode 20 is a sheet-shaped electrode, the sheet-shaped electrode can be a flat plate-shaped electrode, or can be a sheet-shaped electrode with a bending part. Figure 7 And Figure 8 The structure schematic diagrams of the sheet-shaped electrode with the bending part before and after assembly are shown. As Figure 7 shown, the sheet-shaped electrode 20 includes a main body part 210 and a bending part 211, the number of the bending parts 211 can be a plurality, the plurality of bending parts 211 are distributed at the circumferential side of the main body part 210, and the bending part 211 can be bent relative to the main body part 210. Before assembly, the bending part 211 is in the same plane as the main body part 210. As Figure 8 shown, the plurality of bending parts 211 are bent towards the center direction of the main body part 210, the orthographic projection of the bending part 211 falls on the orthographic projection of the thickness direction of the main body part 210, and the sheet-shaped electrode can be further adhesively fixed after being clamped on the first fixing wire 31 and / or the second fixing wire 32 by the plurality of bending parts 211.

[0075] The sheet-shaped electrode 20 can make the overall diameter of the ablation assembly 100 smaller. The electrode 20 can also be in the form of a multi-layer composite FPC, and the electrode 20, the temperature measurement and the radio frequency can be integrated.

[0076] The application further provides an ablation catheter 200, please refer to Figure 3 and Figure 4 The ablation catheter 200 comprises a head end 201, a catheter 202, a traction wire 203 and the ablation assembly 100 of any of the preceding embodiments, the head end 201 is connected with the distal end 13 of the electrode holder 10, the catheter 202 is connected with the proximal end 12 of the electrode holder 10, the catheter 202 has a first lumen extending in the axial direction; the traction wire 203 is connected with the head end 201, the traction wire 203 movably passes through the first lumen and the electrode holder 10, when the traction wire 203 moves from the distal end 13 to the proximal end 12, the electrode holder 10 is switched from the contracted state to the expanded state.

[0077] Under the action of the traction wire 203, the head end 201 can be pulled, and then the electrode holder 10 is driven to complete the shape switching between the contracted state and the expanded state, so that the electrodes 20 on the electrode holder 10 are attached to the wall, and radiofrequency ablation is completed, which is simple and fast, and only needs to act on the traction wire 203. It should be noted that the features in the embodiments of the application can be combined with each other without conflict.

[0078] The above only describes the preferred embodiments of the application and is not used to limit the application. For those skilled in the art, the application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. An ablation assembly, comprising: The electrode support can radially contract and expand, and is a grid structure formed by sequentially connecting a plurality of unit grids, two ends of the electrode support being gathered to form a distal end and a proximal end of the electrode support, respectively. An electrode is fixedly arranged on the electrode support. At least one of the plurality of unit grids is provided with a fixing assembly for mounting the electrode, the fixing assembly comprising a first fixing wire, one end of the first fixing wire being connected to the unit grid, the other end of the first fixing wire being a free end, the first fixing wire being used for threading the electrode, and the electrode being fixedly connected to the first fixing wire.

2. The ablation assembly of claim 1, wherein, The unit grid comprises a first support wire, a second support wire, a third support wire and a fourth support wire connected in sequence, the first support wire and the third support wire being parallel to each other, and the second support wire and the fourth support wire being parallel to each other.

3. The ablation assembly of claim 2, wherein, 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. The fixing assembly further comprises:

4. The ablation assembly of claim 3, wherein, A second fixing wire, one end of the second fixing wire being connected to the midpoint of the third support wire, the other end of the second fixing wire pointing to the midpoint of the first support wire, the second fixing wire being parallel to and arranged in close contact with the first fixing wire. 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 is threaded on the overlapping portion of the first fixing wire and the second fixing wire, and is fixedly connected to the overlapping portion. 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.

5. The ablation assembly of claim 4, wherein, The length of the first fixing wire is equal to the length of the second fixing wire. The first fixing wire, the second fixing wire and the unit grid are integrally formed.

6. The ablation assembly of claim 4, wherein, The plurality of unit grids comprises a first unit grid and a second unit grid, the area of the hollow region of the second unit grid being an integer multiple of the area of the hollow region of the first unit grid.

7. The ablation assembly of claim 2, wherein, The number of the second unit grids is a plurality, and the plurality of second unit grids are arranged along the circumferential direction and / or the axial direction of the electrode support.

8. The ablation assembly of claim 7, wherein, The number of the electrodes is a plurality, and at least part of the second unit grids in the plurality of second unit grids are provided with the fixing assembly.

9. The ablation assembly of claim 8, wherein, The ablation assembly comprises a head, a catheter, a traction wire and the electrode support according to any one of claims 1-9, the head being connected to the distal end of the electrode support, the catheter being connected to the proximal end of the electrode support, the catheter having a first lumen extending in the axial direction; the traction wire is connected to the head, and the traction wire is movably threaded in the first lumen and the electrode support, and when the traction wire moves from the distal end to the proximal end, the electrode support switches from the contracted state to the expanded state.

10. An ablation catheter characterized by, ​

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