Ablation catheter and ablation equipment

Abstract

The embodiment of the utility model provides an ablation catheter and ablation equipment, and belongs to the technical field of ablation. The ablation catheter comprises a catheter body, supporting parts capable of shrinking in the radial direction and an effect device, the ends, close to the catheter body, of the supporting parts gather together to form the near ends of the supporting parts, and the far ends of the supporting parts are open; the effect device is arranged at the far end of the supporting component; wherein the catheter comprises an inner tube and an outer tube, the near end of the supporting component is connected with the far end of the inner tube, and the outer tube is movably arranged on the inner tube in a sleeving mode in the axial direction of the inner tube; when the supporting part is located in the outer pipe, the outer pipe provides circumferential constraining force to keep the supporting part in the contraction state, and after the supporting part extends out of the outer pipe, the supporting part resets to the expansion state from the contraction state after losing the constraining force of the outer pipe. The ablation catheter can reduce the contraction size of the far end of the catheter, so that the puncture wound of a patient is reduced, and the risk of complications is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ablation technology, in particular to an ablation catheter and an ablation device. 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 the ablation. The ablation catheter generally comprises a catheter, an electrode support and a traction wire. The distal end of the catheter is the electrode support, the proximal end of the electrode support is connected to the distal end of the catheter, and the traction wire is arranged in the catheter and the electrode support and connected to the distal end of the electrode support. Generally, the electrode support is switched between the contracted state and the expanded state by pulling the traction wire, but the arrangement of the traction wire increases the bundled diameter of the distal end of the catheter in the contracted state, affecting the external size of the distal end of the ablation catheter. SUMMARY

[0003] The ablation catheter and the ablation device provided by the embodiments of the present application can reduce the bundled size of the distal end of the catheter, thereby reducing the puncture wound of the patient and reducing the risk of complications.

[0004] In a first aspect, the embodiments of the present application provide an ablation catheter. The ablation catheter comprises a catheter, a radially contractible support component and an effector. The support component is gathered near one end of the catheter to form a proximal end of the support component, and the distal end of the support component is open. The effector is arranged at the distal end of the support component. The catheter comprises an inner tube and an outer tube. The proximal end of the support component is connected to the distal end of the inner tube, and the outer tube is movably sleeved on the inner tube along the axial direction of the inner tube. When the support component is located in the outer tube, the outer tube provides a circumferential constraint force to keep the support component in the contracted state. After the support component extends out of the outer tube, the support component is reset from the contracted state to the expanded state after losing the constraint force of the outer tube.

[0005] In the technical scheme, the catheter comprises an inner tube and an outer tube, the outer tube is sleeved on the inner tube, a support member is arranged at the distal end of the inner tube, and the support member is radially retractable. When the outer tube is moved relative to the inner tube to locate the support member in the outer tube, the outer tube can provide a circumferential constraint force to the support member to maintain the support member in a retracted state. When the outer tube is retracted in the proximal direction, the support member extends out of the outer tube, and the support member is automatically reset to an expanded state, the diameter of the support member is increased, the support member is attached to the wall, and ablation is performed on a target ablation site by an effector on the support member. That is, the relative movement of the outer tube and the inner tube in the axial direction is used to switch the support member between the expanded state and the retracted state. Compared with the prior art, the support member is pulled to switch the shape by using a pulling wire, and the pulling wire is not arranged, so that the diameter of the distal end of the catheter is smaller, the size of the distal end of the catheter is reduced, the catheter can pass through a small size sheath / catheter, and the puncture wound of the patient is reduced, and the risk of complications is reduced. Similarly, the size of the catheter is smaller, the femoral artery and radial artery approach can be selected, the possibility of different surgical approaches is increased, and the selection range of medical staff is wider. Moreover, the ablation catheter does not need to be pulled by the pulling wire, the distal end of the support member is open, the structure of the support member is simplified, compared with the closed cage frame body at the distal end of the support member, the radial retraction ability and reset ability of the support member with the open distal end are stronger, and the effective wall attachment of the effector such as the electrode on the support member is easier to achieve. In some embodiments, along the axial direction of the outer tube, the outer tube comprises a conveying section, a transition section and a soft section which are sequentially distributed, and the soft section is located at the distal end of the outer tube; the elastic modulus of the conveying section is greater than that of the transition section, and the elastic modulus of the transition section is greater than that of the soft section.

[0006] In the technical scheme, the distal end of the outer tube is provided with a soft and hard transition section, the distal end of the outer tube is a soft section, and has a certain bending deformation ability. When the catheter needs to ablate the opening position of the natural cavity of the human body, such as the main stem of the blood vessel, the risk of slipping of the distal end of the catheter from the main stem of the blood vessel can be reduced due to the too hard distal end of the outer tube. Moreover, the distal end of the outer tube is gradually distributed in the soft and hard section, the outer tube has a certain bending performance and strong adaptability, and the catheter can be fixed at the opening of the main stem of the blood vessel for ablation.

[0007] In some embodiments, the number of effectors is multiple, the multiple effectors are spaced apart along the circumferential direction and the axial direction of the support member, and each effector does not overlap in the axial projection of the support member.

[0008] In the technical solution, the multiple effect devices are spaced in the axial direction and the circumferential direction of the support component, so that the multiple effect devices on the support component are not overlapped in the axial direction, and the risk of transition ablation is reduced. The multiple effect devices on the support component are spaced in the 360° circumferential direction of the support component, so that the ablation catheter can achieve full quadrant ablation of the target ablation region.

[0009] In some embodiments, the support component includes a first body and a first mounting portion. The first body is a mesh structure formed by multiple unit grids connected to each other. The first body can be deformed in the radial direction of the support component. The distal end of the first body is open to form multiple first free ends at the distal end of the support component. The first mounting portion is located at the first free end for mounting the effect device. In the axial direction of the support component, the distance between the multiple first free ends and the inner tube decreases sequentially, and the multiple first free ends are spaced in the circumferential direction of the first body. Preferably, the first mounting portion is arranged in line with the extension direction of the first body.

[0010] In the technical solution, the support component includes a first body and a first mounting portion. The first body is a mesh structure, and the first body can be deformed in the radial direction. Multiple first free ends are formed at the distal end of the first body, and the distance between each first free end and the inner tube decreases sequentially, so that the multiple first free ends are spaced in the axial direction of the first body. On the one hand, the multiple effect devices can be arranged in the first mounting portion on each first free end, which can automatically achieve the spacing of the multiple effect devices in the axial direction and the circumferential direction of the support component, and the arrangement of the effect devices is simple and fast. On the other hand, the multiple first free ends of the first body are spaced in the axial direction of the first body, so that the density of the unit grid at the same cross section of the distal end of the first body is smaller, the radial contraction and reset ability of the distal end of the support component is stronger, and the effective wall adhesion of the effect device such as the electrode on the support component is easier to achieve.

[0011] The first mounting portion is arranged in line with the extension direction of the first body, and the effect device is arranged on the first mounting portion. The first mounting portion and the first body are deformed synchronously. Through the expansion of the first body, the effective wall adhesion of the effect device such as the electrode can be achieved, and the mounting stability of the effect device on the first body is high.

[0012] In some embodiments, the multiple unit grids include first unit grids and second unit grids. The shapes of the first unit grids and the second unit grids are both parallelograms. The area of the second unit grid is an integer multiple of the area of the first unit grid. Preferably, the second unit grid is arranged closer to the distal end of the inner tube than the first unit grid, and the first free end is located on the first unit grid and / or the second unit grid. Further, the number of the second unit grids is multiple, and the multiple second unit grids are arranged in the circumferential direction and / or the axial direction of the support component.

[0013] In the technical solution, the plurality of unit grids are divided into the first unit grids and the second unit grids, the area of the second unit grid is an integer multiple of the area of the first unit grid, which is equivalent to reducing the support wire of the first unit grid on the support member to obtain the second unit grid. In the case of meeting the overall stability of the support member, the density of the support wire at the corresponding position of the same cross section on the support member is different, thereby reducing the convergence diameter of the corresponding position on the support member, and the application range is wider, so that the catheter can pass through a small size sheath tube / guide catheter.

[0014] Since the density of the support wire at the distal end of the first body is smaller, the convergence diameter of the distal end of the first body is relatively smaller, and a part of the first unit grid can be arranged at the position of the distal end of the first body. The convergence diameter of the support member in the contracted state is larger at the position closer to the distal end of the inner tube, and therefore, by arranging the second unit grid at the region closer to the distal end of the inner tube on the first body, the density of the support wire at the position close to the inner tube of the first body can be effectively controlled, so that the density of the support wire at the proximal end of the first body is smaller, and the convergence diameter of the proximal end of the first body in the contracted state is reduced, the diameter difference of the first body in the contracted state is smaller, and the convergence diameter of the first body as a whole is smaller, so that the catheter can pass through a small size sheath tube / guide catheter.

[0015] The plurality of second unit grids are arranged along the circumferential direction and / or the axial direction of the support member, and the position distribution of the second unit grid on the support member can be selected according to the actual situation, and the distribution of the second unit grid is more flexible.

[0016] In some embodiments, the first mounting portion is arranged to bend radially outward relative to the first body, so that the first mounting portion is located on the outer side of the radial direction of the first body, and the effector device is arranged on the first mounting portion.

[0017] In the technical solution, the first mounting portion is arranged to bend radially outward relative to the first body along the radial direction of the first body, that is, the first mounting portion can expand radially outward relative to the first body and is located on the outer side of the radial direction of the first body, and the effector device is mounted on the first mounting portion, so that the effector device can rely on the radial expansion deformation of the first body and the first mounting portion to realize the wall adhesion of the effector device such as an electrode. On the one hand, compared with the mode that the first body expands as a whole to drive the first mounting portion to expand, the first mounting portion expands relative to the first body, so that the first body itself slightly expands or does not expand in the radial direction, thereby reducing the outer diameter size of the first body and the size of the support member. On the other hand, when the outer tube relatively slides to the distal end of the inner tube, the outer tube only needs to bear smaller resistance when extruding the support member to contract inward, and it is easier to quickly switch between the contracted state and the expanded state of the support member.

[0018] In some embodiments, along the radial direction of the support component, the outer diameter of the first body is greater than the inner diameter of the outer tube in the expanded state.

[0019] In the above technical solution, the outer diameter of the first body is greater than the inner diameter of the outer tube in the expanded state of the support component, that is, both the first mounting portion and the first body can be radially deformed, and after the first body itself expands radially after losing the constraint of the outer tube, the first mounting portion expands radially again on the basis of the first body, thereby meeting the radial deformation range of the support component through the first mounting portion and the first body together, which can ensure that the first body provides stable support for the first mounting portion while meeting the radial expansion range requirement of the support component.

[0020] In some embodiments, along the radial direction of the support component, the outer diameter of the first body is less than the inner diameter of the outer tube in the expanded state.

[0021] In the above technical solution, the outer diameter of the first body is less than the inner diameter of the outer tube in the expanded state of the support component, so that the first body does not deform radially or expand radially, and the support component deforms radially through the first mounting portion, thereby realizing the wall adhesion of the effector device such as an electrode. The first body mainly provides mounting function for the first mounting portion, and the radial deformation range of the support component is met through the local deformation of the first mounting portion, which simplifies the structural complexity of the first body, reduces the diameter of the first body, and is more suitable for radiofrequency ablation of blood vessels with small size.

[0022] In some embodiments, a groove is provided on the first mounting portion, and the groove is used for embedding the effector device.

[0023] In the above technical solution, the groove is provided on the first mounting portion, and the groove can accommodate at least part of the effector device, so that the radial size of the support component is smaller after the effector device is installed in the groove of the first mounting portion. On the other hand, the groove can limit the effector device, so that the installation stability of the effector device on the support component is higher.

[0024] In some embodiments, a buckle portion is provided on the first mounting portion, and the first mounting portion is clamped with the effector device through the buckle portion.

[0025] In the above technical solution, the effector device is clamped and fixed with the buckle portion of the first mounting portion, which ensures the installation stability of the effector device on the first mounting portion, and the installation method of the effector device is simpler, the effector device is convenient and fast to disassemble and assemble, and is easy to maintain and replace subsequently.

[0026] In some embodiments, the effector device is an electrode, and the effector device includes at least one of a round tube electrode and a sheet electrode.

[0027] In the technical solution, the effector device is an electrode, and the shape of the electrode can be a round tube electrode or a sheet electrode. The specific shape of the electrode can be determined according to actual conditions, and the selection of the electrode is more flexible.

[0028] In some embodiments, the electrode is a sheet electrode, and the electrode includes an electrode pad, an electrolytic copper layer, a substrate layer, a constantan layer, a second insulating layer, and a constantan pad, which are sequentially stacked. The electrode pad is arranged on the electrolytic copper layer. The electrolytic copper layer is provided with a first insulating layer around the periphery. The second insulating layer is arranged on the constantan layer. The constantan pad covers at least part of the constantan layer. The electrolytic copper layer and the constantan layer are respectively located on opposite sides of the substrate layer. The electrolytic copper layer, the substrate layer, and the constantan layer are provided with through holes that are in communication with each other, so as to form a temperature measuring thermocouple between the electrolytic copper layer and the constantan layer.

[0029] In the technical solution, the electrode is a sheet electrode, and the electrode is stacked by the electrolytic copper layer and the constantan layer. The electrolytic copper layer and the constantan layer are in communication through the through holes, and a temperature measuring thermocouple is formed. The electrode pad is arranged on the electrolytic copper layer, that is, the electrolytic copper layer is plated with gold to form an electrode surface. The electrolytic copper layer is provided with a first insulating layer around the periphery, which can play an insulating role. When the electrode expands automatically along with the support component, the electrode pad of the electrode is attached to the inner wall of the natural cavity of the human body, such as a blood vessel, to achieve ablation. The constantan pad is arranged at the tail end of the constantan layer, which can be used to connect with the handle through a wire. The second insulating layer covers the constantan layer, which plays an insulating and protective role on the constantan layer. That is, the sheet electrode can realize the dual functions of ablation and temperature measurement.

[0030] In some embodiments, the support component includes a second body and a second mounting portion. The second body is a flexible snake tube, and the outer diameter of the second body is smaller than the inner diameter of the outer tube. The proximal end of the second body is connected to the distal end of the inner tube, and the distal end of the second body is open to form a plurality of second free ends. The second mounting portion is located at the second free end for mounting the effector device. Along the axial direction of the support component, the distance between the plurality of second free ends and the distal end of the inner tube decreases in sequence, and the plurality of second free ends are distributed along the circumferential direction of the second body. The second mounting portion is radially outwardly curved relative to the second body, so that the second mounting portion is located on the outer side of the second body.

[0031] In the technical solution, the second body is in the form of a snake bone tube stent, the bending performance of the support member is better, the support member can be applied to a relatively curved blood vessel branch, and the application range is wider. The distance between the plurality of second free ends and the distal end of the inner tube decreases in turn, and the plurality of second free ends are distributed along the circumference of the second body. The plurality of effectors can be arranged on the second mounting portions on the plurality of second free ends, so that the plurality of effectors can be automatically arranged in the axial direction and the circumferential direction of the support member, and the arrangement mode of the effectors is simple and fast. The plurality of second free ends are arranged to expand radially outward relative to the second body, the diameter of the second body is smaller than the inner diameter of the outer tube, the radial size of the second body does not change when the support member switches between the contracted state and the expanded state, the second mounting portion can be bent and deformed in the radial direction, so that the effectors such as electrodes can be attached to the wall and the support member can be contracted and expanded. When the outer tube slides relative to the inner tube in the distal direction, the outer tube extrudes the second free end and the second mounting portion, so that the first mounting portion is deformed and contracted in the radial direction and towards the second body, and the outer tube maintains the support member in the contracted state. When the outer tube moves in the proximal direction and is separated from the support member, the second body does not expand radially, and the second mounting portion expands outward under the restoring force after losing the constraint of the outer tube, so that the effectors can ablate the target ablation area.

[0032] In some embodiments, the ablation catheter further comprises a guide wire, the guide wire being movably arranged in the catheter and the support member, and a distal end of the guide wire being capable of extending out of a distal end of the support member.

[0033] In the technical solution, the guide wire is arranged, the guide wire can extend out of the distal end of the support member, and the guide wire can find the target branch blood vessel. The guide wire can extend out of the catheter or be withdrawn into the catheter without being exposed.

[0034] In a second aspect, the embodiments of the present application further provide an ablation device, which comprises the ablation catheter in any of the foregoing embodiments.

[0035] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0037] Figure 1 The structure of the ablation catheter provided by some embodiments of the present application is shown in the schematic view.

[0038] Figure 2 Structure diagram of the support member in the ablation catheter according to some embodiments of the application;

[0039] Figure 3 Structure diagram of the support member in the ablation catheter according to some embodiments of the application; Figure 2 Structure diagram of another angle of the support member in the ablation catheter according to some embodiments of the application;

[0040] Figure 4 Structure diagram of the first mounting portion being a buckle portion in the ablation catheter according to some embodiments of the application;

[0041] Figure 5 Structure diagram of the first mounting portion in the ablation catheter according to some embodiments of the application;

[0042] Figure 6 Structure diagram of the support member in the ablation catheter according to some embodiments of the application;

[0043] Figure 7 Structure diagram of the first mounting portion in the support member of the ablation catheter according to some embodiments of the application, which can be expanded relative to the first body;

[0044] Figure 8 Structure diagram of the support member in the ablation catheter according to some embodiments of the application; Figure 7 Side view of the support member in the ablation catheter according to some embodiments of the application;

[0045] Figure 9 Structure diagram of another angle of the support member in the ablation catheter according to some embodiments of the application; Figure 7 Structure diagram of another angle of the support member in the ablation catheter according to some embodiments of the application;

[0046] Figure 10 Structure diagram of the support member in the ablation catheter according to some embodiments of the application, on which a sheet-shaped electrode is loaded; Figure 7 Structure diagram of the support member in the ablation catheter according to some embodiments of the application, on which a sheet-shaped electrode is loaded;

[0047] Figure 11 Structure diagram of the support member in the ablation catheter according to some embodiments of the application, which is a snake bone tube;

[0048] Figure 12 Structure diagram of the support member in the ablation catheter according to some embodiments of the application, which is a snake bone tube and is provided in a closed manner at the distal end;

[0049] Figure 13 Partial exploded diagram of the electrode in the ablation catheter according to some embodiments of the application, which is a sheet-shaped electrode;

[0050] Figure 14 Structure diagram of the electrode in the ablation catheter according to some embodiments of the application, which is a tubular electrode;

[0051] Figure 15 Structure diagram of the electrode in the ablation catheter according to some embodiments of the application, which is a tubular electrode;

[0052] Figure 16 A schematic diagram of the structure of the ablation catheter provided in other embodiments of the application, showing the electrode as a sheet electrode with a bent portion before assembly;

[0053] Figure 17 This is a schematic diagram of the structure of an ablation catheter with a bent sheet electrode assembled in some other embodiments of the application.

[0054] Icons: 100-Ablation catheter; 10-Catheter; 11-Inner tube; 12-Outer tube; 121-Delivery section; 122-Transition section; 123-Soft section; 20-Support component; 21-Proximal end; 22-Distal end; 23-First body; 231-Unit grid; 2311-First unit grid; 2312-Second unit grid; 232-First free end; 24-First mounting part; 241-Groove; 242-Snap-on part; 25-Second body; 26-Second mounting part; 30-Effect device; 31-Electrode pad; 32-Electrolytic copper layer; 33-First insulating layer; 34-Substrate layer; 35-Constantan layer; 36-Second insulating layer; 37-Through hole; 39-Third insulating layer; 301-Main body; 302-Bending part; 40-Guide wire. Detailed Implementation

[0055] 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.

[0056] 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.

[0057] 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.

[0058] In the description of the embodiments of the present application, it should be noted that the indicated position or positional relationship is based on the position or positional relationship shown in the drawings, or the position or positional relationship commonly used when the product of the application is placed, only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular position, be constructed and operated in a particular position, and therefore cannot be understood as a limitation of 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.

[0059] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "set", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between the two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0060] The present application provides an ablation catheter, please refer to Figures 1 to 12 The ablation catheter 100 comprises a catheter 10, a radially contractible support member 20 and an effector 30, the support member 20 is gathered near one end of the catheter 10 to form a proximal end 21 of the support member 20, and a distal end 22 of the support member 20 is open; the effector 30 is arranged at the distal end 22 of the support member 20; wherein the catheter 10 comprises an inner tube 11 and an outer tube 12, the proximal end 21 of the support member 20 is connected with the distal end of the inner tube 11, and the outer tube 12 is movably sleeved on the inner tube 11 along the axial direction of the inner tube 11; when the support member 20 is located in the outer tube 12, the outer tube 12 provides a circumferential constraint force to keep the support member 20 in a contracted state, and after the support member 20 extends out of the outer tube 12, the support member 20 is reset from the contracted state to the expanded state after losing the constraint force of the outer tube 12.

[0061] In the present solution, the catheter 10 comprises an inner tube 11 and an outer tube 12, the outer tube 12 is sleeved on the inner tube 11, the support member 20 is arranged at the distal end of the inner tube 11, and the support member 20 is radially contractible. When the outer tube 12 moves relative to the inner tube 11 to locate the support member 20 in the outer tube 12, the outer tube 12 can provide a circumferential constraint force to the support member 20 to maintain the support member 20 in a contracted state. When the outer tube 12 is withdrawn towards the proximal end 21, the support member 20 extends out of the outer tube 12, and the support member 20 automatically resets to an expanded state, the diameter of the support member 20 becomes larger, the support member 20 adheres to the wall, and the ablation of the target ablation site is achieved through the effectors 30 on the support member 20. That is, the relative movement of the outer tube 12 and the inner tube 11 in the axial direction is used to switch the support member 20 between the expanded state and the contracted state. Compared with the prior art ablation catheter which needs to set a pull wire to pull the support member 20 to achieve shape switching, the setting of the pull wire is omitted, the diameter of the distal end of the catheter 10 is smaller, the size of the distal end of the catheter 10 can be reduced, and the catheter 10 can pass through a small size sheath / catheter guide, thereby reducing the puncture wound of the patient and reducing the risk of complications. Similarly, the smaller size of the catheter 10 can select the femoral artery and radial artery approach, increase the possibility of different approaches of the operation, and the medical staff has a wider selection range. Moreover, the ablation catheter 100 does not need to be pulled by a pull wire, the distal end 22 of the support member 20 is arranged in an open manner, the structure of the support member 20 is simplified, and compared with the closed cage body of the distal end 22 of the support member 20, the radial contraction and resetting capabilities of the support member 20 with the open distal end 22 are stronger, and the effective adhesion of the effectors 30 such as electrodes on the support member 20 is easier to achieve.

[0062] Wherein, the radially contractible support member 20 means that the support member 20 can be radially deformed. The support member 20 can be a variety of forms of stents, the support member 20 can be cast / injected by metal / high polymer materials, or can be hot-welded by metal wires / high polymer wires, or can be rolled into a tubular shape after laser engraving of metal plates / high polymer plates. Specifically, when the base material of the support member 20 is tubular, the support member 20 can be expanded by a jig and then heat-set. Different materials have different temperatures. When the base material of the support member 20 is a sheet, the sheet can be rolled and fixed on a jig and then heat-set. After setting, the support member 20 can be formed by welding / bonding, etc. The material of the support member 20 can be metal, memory alloy or high polymer material, etc. The support member 20 can be heat-set to achieve the self-expanding function of the support member 20.

[0063] The following embodiments are non-restrictively illustrated based on radiofrequency ablation. Those skilled in the art can understand that the following description is only exemplary, and similarly, the ablation catheter provided in the present application can be applied to other ablation scenarios such as ultrasonic ablation, laser ablation, cryoablation, chemical ablation, etc. after being adapted based on the application scenario.

[0064] The effector 30 refers to an ablation component capable of realizing the ablation function. The effector 30 can be an electrode for electric field ablation, or an ultrasonic transducer for ultrasonic ablation, etc. Taking the electrode as an example, the shape of the electrode can be a tube electrode or a sheet electrode. The sheet electrode can make the overall diameter of the support component 20 smaller after being bundled. The electrode can also be in the form of a multi-layer composite FPC, integrating the electrode, temperature measurement and ablation into one.

[0065] In some embodiments, referring to Figure 1 , along the axial direction of the outer tube 12, the outer tube 12 includes a delivery section 121, a transition section 122 and a soft section 123 distributed in sequence, and the soft section 123 is located at the distal end of the outer tube 12; the elastic modulus of the delivery section 121 is greater than that of the transition section 122, and the elastic modulus of the transition section 122 is greater than that of the soft section 123. The distal end of the outer tube 12 is provided with a soft and hard transition section 122, and the distal end of the outer tube 12 is a soft section 123 with certain bending deformation capability. Thus, when the catheter 10 needs to ablate the opening position of the natural cavity of the human body, such as the main trunk of the blood vessel, the risk of the distal end of the catheter 10 slipping off the main trunk of the blood vessel can be reduced due to the too hard distal end of the outer tube 12. Moreover, the distal end of the outer tube 12 is gradually distributed in the soft and hard sections, and the outer tube 12 has certain bending performance and strong adaptability, which can facilitate the fixation of the catheter 10 at the opening of the main trunk of the blood vessel for ablation.

[0066] The natural cavity of the human body can be a bronchus, a biliary tract, an esophagus, a gastrointestinal tract, a urogenital tract or a blood vessel, etc. Taking the blood vessel as an example, for example, the intractable hypertension is treated by ablation of the renal sympathetic nerve or the external carotid nerve, the type 2 diabetes is treated by ablation of the nerve near the liver, the function of the metabolic organs is affected by ablation of the sympathetic nerve that dominates the internal organs such as the liver, pancreas and gastrointestinal tract, and the pain is relieved by ablation of the nerve outside the peripheral blood vessels.

[0067] The cavities of the following embodiments are taken as examples of blood vessels, and the application scenario is the treatment of intractable hypertension by ablation of the renal sympathetic nerve. This is only for the understanding of the technology by those skilled in the art, and is not intended to exclude the application of the technical solutions of the present application to other scenarios. It should be understood that the embodiments of the present application can be applied to a class of scenarios, and those skilled in the art can directly apply them to various treatment scenarios under the guidance of the description. The application of the technical solutions of the present application to various similar scenarios belongs to the protection scope and implementation manner of the present application.

[0068] The diameter of catheter 10 can be 1.0 mm to 2.0 mm. Preferably, the diameter of catheter 10 is 1.0 to 1.7 mm. For femoral artery puncture, if an 8F sheath (ID 2.3 mm, OD 2.7 mm) is used, the puncture site needs to be sutured, and there is a risk of complications. For femoral artery puncture, if a 6F sheath (ID 1.8 mm, OD 2.0 mm) is used, hemostasis can be achieved through compression, and the risk of complications is low. If the radial artery is punctured, an 8F sheath cannot be used, and a 6F sheath must be used, increasing the possibility of different surgical approaches. The procedure can also be performed via brachial artery puncture.

[0069] In some embodiments, please refer to Figure 1 , Figure 2 and Figure 3 The ablation catheter 100 comprises multiple effect devices 30, which are spaced apart circumferentially and axially along the support component 20, and do not overlap in the axial projection of the support component 20. This spaced distribution of the multiple effect devices 30 along the axial and circumferential directions of the support component 20 ensures that the multiple effect devices 30 on the support component 20 do not overlap axially, reducing the risk of over-ablation. Furthermore, the multiple effect devices 30 on the support component 20 are spaced apart along a 360° circumference, achieving the purpose of full-quadrant ablation of the target ablation area by the ablation catheter 100.

[0070] The multiple effect devices 30 are distributed at intervals along the circumference and axial direction of the support member 20, meaning that the multiple effect devices 30 are arranged at intervals in both the circumference and axial direction of the support member 20. The number of effect devices 30 can be two, four, six, or eight, depending on the actual situation. In this embodiment, the number of effect devices 30 is six, which are equally spaced in the circumference of the support member 20 and spaced apart in the axial direction of the support member 20.

[0071] In some embodiments, please refer to Figure 4 The support component 20 includes a first body 23 and a first mounting portion 24. The first body 23 is a mesh structure formed by interconnecting multiple unit grids 231. The first body 23 can shrink and deform in the radial direction of the support component 20. The distal end 22 of the first body 23 is open, so that multiple first free ends 232 are formed at the distal end 22 of the support component 20. The first mounting portion 24 is located at the first free ends 232 for mounting the effect device 30. Along the axial direction of the support component 20, the distance between the multiple first free ends 232 and the inner tube 11 decreases sequentially, and the multiple first free ends 232 are distributed at intervals along the circumferential direction of the first body 23.

[0072] The support component 20 comprises a first body 23 and a first mounting portion 24. The first body 23 is in a mesh structure and is radially contractible and deformable. A plurality of first free ends 232 are formed at the distal end 22 of the first body 23. The distance between each first free end 232 and the inner tube 11 is sequentially decreased, so that the plurality of first free ends 232 are sequentially and spacedly distributed along the axial direction of the first body 23. In one aspect, the plurality of effect devices 30 can be arranged on the first mounting portion 24 of each first free end 232, so that the plurality of effect devices 30 can be automatically arranged in the axial direction and the circumferential direction of the support component 20, and the effect devices 30 can be arranged in a simple and fast manner. In another aspect, the plurality of first free ends 232 of the first body 23 are sequentially and spacedly distributed along the axial direction of the first body 23, so that the density of the unit mesh 231 of the same section of the distal end 22 of the first body 23 is smaller, the radial contraction and reset capability of the distal end 22 of the support component 20 is stronger, and the effective wall adhesion of the effect devices 30 such as electrodes on the support component 20 can be more easily achieved.

[0073] In the support component 20, the shape of each unit mesh 231 can be the same or not. In the embodiment, the shape of each unit mesh 231 in the support component 20 is the same. Further, the area of each unit mesh 231 in the first body 23 can be equal or not, which is determined according to the actual situation.

[0074] The first mounting portion 24 refers to a mounting component on the support component 20 for providing the mounting function for the effect device 30. The first mounting portion 24 can be integrally formed with the first body 23.

[0075] The extension direction of the first mounting portion 24 and the first body 23 can be arranged in the same line, that is, the first mounting portion 24 is arranged along the extension direction of the first body 23, and the effect device 30 expands or contracts along with the first body 23. Of course, the first mounting portion 24 can be arranged at an angle with the first body 23, for example, the first mounting portion 24 can be located on the outside of the radial direction of the first body 23, the first mounting portion 24 is not in the same plane with the first body 23, and the first mounting portion 24 can expand radially relative to the first body 23. In this way, the effect device 30 is arranged on the first mounting portion 24, and the effect device 30 can expand and contract along with the first body 23 and the first mounting portion 24.

[0076] In some embodiments, please refer to Figures 1 to 6The first mounting portion 24 is arranged in line with the extending direction of the first body 23. The effector 30 is arranged on the first mounting portion 24, and the first mounting portion 24 is synchronous with the first body 23 to contract and expand. Through the expansion of the first body 23, the effector 30 such as an electrode can be effectively attached to the wall, and the mounting stability of the effector 30 on the first body 23 is high.

[0077] In some embodiments, referring to Figure 6 The plurality of unit grids 231 include a first unit grid 2311 and a second unit grid 2312, and the shapes of the first unit grid 2311 and the second unit grid 2312 are both parallelogram. The area of the second unit grid 2312 is an integer multiple of the area of the first unit grid 2311. By dividing the plurality of unit grids 231 into the first unit grid 2311 and the second unit grid 2312, and the area of the second unit grid 2312 being an integer multiple of the area of the first unit grid 2311, it is equivalent to reducing the support wires of the first unit grid 2311 on the support member 20 to obtain the second unit grid 2312. Under the condition of meeting the overall stability of the support member 20, the density of the support wires at the corresponding positions of the same cross section of the support member 20 is different, thereby reducing the convergence diameter of the corresponding positions of the support member 20, and the application range is wider, so that the catheter 10 can pass through a small size sheath / catheter guide.

[0078] The shapes of the first unit grid 2311 and the second unit grid 2312 can be rhombus. The area of the second unit grid 2312 is an integer multiple of the area of the first unit grid 2311, which means that the area of the second unit grid 2312 can be twice, four times or eight times the area of the first unit grid 2311, and the specific value can be determined according to the actual situation.

[0079] In the embodiment, the area of the second unit grid 2312 is four times the area of the first unit grid 2311. It can be understood that each unit grid 231 is formed by connecting a plurality of support wires end to end, and the length of each support wire in the second unit grid 2312 is twice the length of the support wire in the first unit grid 2311. In actual manufacturing, the support wires at the local position of the support member 20 are hollowed out, that is, the area surrounded by four first unit grids 2311 is reduced, so that the four first unit grids 2311 form a second unit grid 2312 with a larger area. Under the condition of the same area, the support wires of the second unit grid 2312 are more dispersed than the support wires of the first unit grid 2311.

[0080] It can be understood that the first body 23 is gradually increased in density from the distal end 22 to the proximal end 21, the number of the stent wires of the first body 23 is more, and the wires of the effector 30 are arranged in the lumen of the inner tube 11 from the distal end 22 to the proximal end 21. That is, the closer the first body 23 is to the proximal end 21 of the support member 20, the more the number of the stent wires of the first body 23 is, and the more the number of the wires of the effector 30 is, and the more the distribution of the wires is, and accordingly, the smaller the diameter of the support member 20 is.

[0081] In some embodiments, referring to Figure 6 , the second unit grid 2312 is arranged closer to the distal end 22 of the inner tube 11 than the first unit grid 2311, and the first free end 232 is located on the first unit grid 2311 and / or the second unit grid 2312.

[0082] Since the density of the stent wires of the distal end 22 of the first body 23 is smaller, the diameter of the first body 23 is relatively smaller, and a part of the first unit grid 2311 is arranged on the first body 23 at the position of the distal end 22. The closer the first body 23 is to the distal end 22 of the inner tube 11, the larger the diameter of the support member 20 is in the contracted state, and therefore, by arranging the second unit grid 2312 on the first body 23 closer to the distal end 22 of the inner tube 11, the density of the stent wires of the first body 23 close to the inner tube 11 can be effectively controlled, so that the density of the stent wires of the first body 23 at the position of the proximal end 21 is smaller, and the diameter of the first body 23 at the position of the proximal end 21 in the contracted state is smaller, and the difference between the diameters of the first body 23 in the contracted state is smaller, and the diameter of the first body 23 in the contracted state is smaller, so that the catheter 10 can pass through a small-sized sheath / catheter guide 10.

[0083] In some embodiments, the number of the second unit grids 2312 is multiple, and the multiple second unit grids 2312 are arranged along the circumferential direction and / or the axial direction of the support member 20. By arranging the multiple second unit grids 2312 along the circumferential direction and / or the axial direction of the support member 20, the distribution of the second unit grids 2312 on the support member 20 can be selected according to actual conditions, and the distribution of the second unit grids 2312 is more flexible.

[0084] In some embodiments, referring to Figures 7 to 10, the first mounting portion 24 is arranged radially outwardly relative to the first body 23 so that the first mounting portion 24 is located radially outwardly of the first body 23, and the effector 30 is arranged on the first mounting portion 24. The first mounting portion 24 is arranged radially outwardly relative to the first body 23, i.e. the first mounting portion 24 can expand radially outwardly relative to the first body 23 and is located radially outwardly of the first body 23, and the effector 30 is mounted on the first mounting portion 24 so that the effector 30 can be deformed by the radial expansion of the first body 23 and the first mounting portion 24 to achieve the wall-adhesion of the effector 30, such as an electrode. On the one hand, compared with the mode that the first mounting portion 24 is expanded by the overall expansion of the first body 23, the expansion of the first mounting portion 24 relative to the first body 23 can reduce the outer diameter of the first body 23, thereby reducing the size of the support member 20. On the other hand, when the outer tube 12 slides relative to the inner tube 11 towards the distal end 22 of the inner tube 11, the outer tube 12 only needs to bear a smaller resistance when it presses the support member 20 to contract inwards, and it is easier to quickly switch between the contracted state and the expanded state of the support member 20.

[0085] In the expanded state of the support member 20, the outer diameter of the first body 23 can be greater than the inner diameter of the outer tube 12. Of course, the outer diameter of the first body 23 can also be smaller than the inner diameter of the outer tube 12, i.e. the first body 23 of the support member 20 is not contractible in the radial direction, and the first mounting portion 24 of the support member 20 is contractible and deformable in the radial direction relative to the first body 23, thereby achieving the contraction and deformation of the support member 20.

[0086] In the case that the outer diameter of the first body 23 is greater than the inner diameter of the outer tube 12, both the first body 23 and the first mounting portion 24 can be expanded and deformed in the radial direction, i.e. both the first body 23 and the first mounting portion 24 can be expanded or contracted and deformed, the first mounting portion 24 can be expanded a second time relative to the first body 23, and the first mounting portion 24 is located radially outwardly of the first body 23.

[0087] In the case that the outer diameter of the first body 23 can be smaller than the inner diameter of the outer tube 12, the first body 23 does not contract or expand in the radial direction, and the support member 20 is expanded or contracted in the radial direction of the first body 23 by the first mounting portion 24, thereby achieving the contraction or expansion of the support member 20.

[0088] In some embodiments, please refer to Figures 7 to 10, along the radial direction of the support member 20, the outer diameter of the first body 23 is greater than the inner diameter of the outer tube 12 in the expanded state. The outer diameter of the first body 23 is greater than the inner diameter of the outer tube 12 in the expanded state of the support member 20, that is, both the first mounting portion 24 and the first body 23 can be radially deformed. After losing the constraint of the outer tube 12, the first body 23 itself expands radially, and the first mounting portion 24 expands radially based on the first body 23, and the radial deformation range of the support member 20 is met by the first mounting portion 24 and the first body 23 together, which can ensure that the first body 23 provides stable support for the first mounting portion 24 while meeting the radial expansion range requirement of the support member 20.

[0089] In some embodiments, along the radial direction of the support member 20, the outer diameter of the first body 23 is less than the inner diameter of the outer tube 12 in the expanded state. The outer diameter of the first body 23 is less than the inner diameter of the outer tube 12 in the expanded state of the support member 20, so that the first body 23 does not deform in the radial direction. The support member 20 expands radially through the first mounting portion 24 on the first body 23, thereby realizing the wall adhesion of the effector 30 such as an electrode. The first body 23 mainly provides mounting function for the first mounting portion 24, and the radial deformation range requirement of the support member 20 is met by the expansion deformation of the first mounting portion 24, which simplifies the structural complexity of the first body 23, reduces the diameter of the first body 23, and is more suitable for radiofrequency ablation of small blood vessels.

[0090] In some embodiments, the support member 20 is a mesh structure cut and engraved from a pipe material. The support member 20 is made by cutting the pipe material, and the manufacturing process of the support member 20 is simple and easy to implement.

[0091] The first mounting portion 24 and the effector 30 have various mounting modes, and the effector 30 can be connected with the first mounting portion 24 in a clamping, embedding or interference fit manner. Of course, in order to improve the connection stability of the effector 30 and the first mounting portion 24, no matter what mechanical connection mode is adopted, finally the effector 30 and the first mounting portion 24 can be adhesively fixed, further improving the mounting stability of the effector 30 on the first mounting portion 24.

[0092] In some embodiments, please refer to Figure 6The first mounting portion 24 is provided with a groove 241 for embedding the effect device 30. The groove 241 can accommodate at least part of the effect device 30, so that the radial dimension of the support member 20 is smaller after the effect device 30 is mounted in the groove 241 of the first mounting portion 24. On the other hand, the groove 241 can limit the effect device 30, so that the mounting stability of the effect device 30 on the support member 20 is higher. In some embodiments, referring to

[0093] In some embodiments, referring to Figure 4 The first mounting portion 24 is provided with a buckle portion 242 for buckling with the effect device 30. The effect device 30 is buckled with the buckle portion 242 of the first mounting portion 24, so that the mounting of the effect device 30 on the first mounting portion 24 is more stable, the mounting of the effect device 30 is simpler, the dismounting of the effect device 30 is more convenient, and the subsequent maintenance and replacement is easier.

[0094] The first mounting portion 24 includes a U-shaped buckling portion, which has a buckle opening for buckling with the effect device 30 at one end away from the first free end 232. The buckle opening can move towards each other under the action of a pressing force, so that the effect device 30 can be buckled into the buckle opening of the buckling portion. The buckle opening is provided with a stopper for preventing the effect device 30 from being separated from the first mounting portion 24.

[0095] In some embodiments, the effect device 30 is an electrode, referring to Figures 14 to 16 The electrode includes at least one of a cylindrical electrode and a sheet electrode. The electrode can be a cylindrical electrode or a sheet electrode, and the specific shape of the electrode can be determined according to actual conditions, so that the selection of the electrode is more flexible.

[0096] The cylindrical electrode of the electrode can have various conditions. For example, as shown in Figure 14 , the electrode can be a straight cylindrical electrode. Of course, as shown in Figure 15 , the electrode can also be a cylindrical electrode with a curved arc.

[0097] In addition, when the electrode is a sheet electrode, the sheet electrode can be a planar electrode or a sheet electrode with a bending portion. Figure 16 and Figure 17 show the structure schematic diagrams of the pre-assembly state and the post-assembly state of the sheet electrode with the bending portion. As shown in Figure 16As shown, the sheet-shaped electrode includes a main body part 301 and a bending part 302, the number of the bending part 302 can be multiple, the multiple bending parts 302 are distributed at intervals on the circumferential side of the main body part 301, and the bending part 302 can be bent relative to the main body part 301. When the sheet-shaped electrode with the bending part is assembled, the bending part 302 is in the same plane as the main body part 301. As shown in Figure 17 As shown, the multiple bending parts 302 are bent towards the center direction of the main body part 301, the orthographic projection of the bending part falls on the orthographic projection of the thickness direction of the main body part, and the sheet-shaped electrode can be clamped on the support part 20 through the multiple bending parts 302.

[0098] In some embodiments, referring to Figure 13 , the electrode is a sheet-shaped electrode, the electrode includes an electrode pad 31, an electrolytic copper layer 32, a substrate layer 34, a constantan layer 35, a second insulating layer 36, and a constantan pad arranged in sequence, the electrode pad 31 is arranged on the electrolytic copper layer 32, the outer periphery of the electrolytic copper layer 32 is provided with a first insulating layer 33, the second insulating layer 36 is arranged on the constantan layer 35, and the constantan pad covers at least part of the constantan layer 35; the electrolytic copper layer 32 and the constantan layer 35 are respectively located on opposite sides of the substrate layer 34, and a via hole 37 in communication with each other is arranged between the electrolytic copper layer 32, the substrate layer 34, and the constantan layer 35, so as to form a temperature measuring thermocouple between the electrolytic copper layer 32 and the constantan layer 35.

[0099] By adopting the sheet-shaped electrode, the electrode is stacked by the electrolytic copper layer 32 and the constantan layer 35, the electrolytic copper layer 32 and the constantan layer 35 are communicated through the via hole 37, a temperature measuring thermocouple is formed, the electrode pad 31 is arranged on the electrolytic copper layer 32, that is, gold is deposited on the electrolytic copper layer 32 to form an electrode surface. The outer periphery of the electrolytic copper layer 32 is provided with the first insulating layer 33, which can play an insulating role. When the electrode expands automatically along with the support part 20, the electrode pad 31 of the electrode is attached to the inner wall of the blood vessel to achieve ablation. The constantan pad is arranged at the tail end of the constantan layer 35, which can be used for connection with the handle through a lead wire, and the second insulating layer 36 covers the constantan layer 35 to play an insulating and protective role on the constantan layer 35. That is, the sheet-shaped electrode can realize the dual functions of ablation and temperature measurement.

[0100] The electrode further includes a third insulating layer 39 arranged on the electrode pad 31.

[0101] In some embodiments, referring to Figure 11The support component 20 comprises a second body 25 and a second mounting portion 26. The second body 25 is a flexible serpentine tube, and the outer diameter of the second body 25 is smaller than the inner diameter of the outer tube 12. The proximal end of the second body 25 is connected to the distal end of the inner tube 11, and the distal end of the second body 25 is open to form a plurality of second free ends. The second mounting portion 26 is located at the second free ends for mounting the effector 30. In the axial direction of the support component 20, the distance between the plurality of second free ends and the distal end of the inner tube 11 decreases sequentially, and the plurality of second free ends are distributed along the circumference of the second body 25. The second mounting portion 26 is radially outwardly curved relative to the second body 25, so that the second mounting portion 26 is located outside the second body 25.

[0102] By adopting the serpentine tube as the second body 25, the bending performance of the support component 20 is better, which can be applied to more curved blood vessel branches, and the application range is wider. In addition, the distance between the plurality of second free ends and the distal end of the inner tube 11 decreases sequentially, and the plurality of second free ends are distributed along the circumference of the second body 25. The plurality of effectors 30 can be arranged on the second mounting portion 26 of each second free end, so that the plurality of effectors 30 can be automatically arranged in the axial direction and the circumferential direction of the support component 20, and the arrangement of the plurality of effectors 30 is simple and fast. The plurality of second free ends are radially outwardly expanded relative to the second body 25, the diameter of the second body 25 itself is smaller than the inner diameter of the outer tube 12, and the radial size of the second body 25 itself does not change when the support component 20 switches between the contracted state and the expanded state. The second mounting portion 26 can be radially deformed, so as to realize the abutment of the effector 30 and the contraction and expansion of the support component 20. When the outer tube 12 slides relative to the inner tube 11 to the distal end 22, the outer tube 12 extrudes the second free end and the second mounting portion 26, so that the first mounting portion 24 is deformed in the radial direction of the second body 25, and the outer tube 12 maintains the support component 20 in the contracted state. When the outer tube 12 moves to the proximal end 21 and is separated from the support component 20, the second body 25 does not radially expand, and the second mounting portion 26 expands outwardly under the restoring force after losing the constraint of the outer tube 12, so as to realize the ablation of the target ablation area by the effector 30.

[0103] Of course, please refer to Figure 12 The distal end of the second body 25 can also be closed, and the distal end of the second body 25 is tapered. In this way, the second body 25 can be arranged with the guide wire 40, and the distal end of the second body 25 can provide support and guidance for the guide wire 40.

[0104] In some embodiments, please refer to Figure 1The ablation catheter 100 further comprises a guide wire 40 movably arranged in the catheter 10 and the support member 20, and the distal end 22 of the guide wire 40 can be extended out of the distal end 22 of the support member 20. By arranging the guide wire 40, the guide wire 40 can be extended out of the distal end 22 of the support member 20 to serve the function of finding the target branch blood vessel. The guide wire 40 can be extended out of the catheter 10 or can be withdrawn into the catheter 10 without being exposed.

[0105] The embodiments of the present application further provide an ablation device, which comprises the ablation catheter 100 in any of the foregoing embodiments.

[0106] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0107] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An ablation catheter, characterized in that, include: catheter; A radially retractable support member, wherein the support member is converged at one end near the conduit to form the proximal end of the support member, and the distal end of the support member is open; The effect device is disposed at the distal end of the support component; The conduit includes an inner tube and an outer tube. The proximal end of the support member is connected to the distal end of the inner tube. The outer tube is movably fitted onto the inner tube along the axial direction of the inner tube. When the support member is located inside the outer tube, the outer tube provides a circumferential constraint force to keep the support member in a contracted state. After the support member extends out of the outer tube, the support member loses the constraint force of the outer tube and returns to the expanded state from the contracted state.

2. The ablation catheter according to claim 1, characterized in that, Along the axial direction of the outer tube, the outer tube includes a conveying section, a transition section and a soft section distributed sequentially, the soft section being located at the distal end of the outer tube; the elastic modulus of the conveying section is greater than the elastic modulus of the transition section, and the elastic modulus of the transition section is greater than the elastic modulus of the soft section.

3. The ablation catheter according to claim 1, characterized in that, The number of effect devices is multiple, and the multiple effect devices are distributed at intervals along the circumference and axial direction of the support component, and the effect devices do not overlap on the axial projection of the support component.

4. The ablation catheter according to claim 3, characterized in that, The support component includes a first body and a first mounting portion. The first body is a mesh structure formed by interconnecting multiple unit grids. The first body can shrink and deform in the radial direction of the support component. The distal end of the first body is open to form multiple first free ends at the distal end of the support component. The first mounting portion is located at the first free ends for mounting the effect device. Along the axial direction of the support component, the distance between the plurality of first free ends and the inner tube decreases sequentially, and the plurality of first free ends are distributed at intervals along the circumferential direction of the first body. The first mounting part is arranged collinearly with the extension direction of the first body.

5. The ablation catheter according to claim 4, characterized in that, The plurality of unit grids include a first unit grid and a second unit grid, both of which are parallelograms in shape; the area of ​​the second unit grid is an integer multiple of the area of ​​the first unit grid; The second unit grid is located closer to the distal end of the inner tube than the first unit grid, and the first free end is located on the first unit grid and / or the second unit grid; The number of the second unit grids is multiple, and the multiple second unit grids are arranged along the circumferential and / or axial direction of the support component.

6. The ablation catheter according to claim 4, characterized in that, The first mounting portion is radially outwardly curved relative to the first body, such that the first mounting portion is located radially outside the first body, and the effect device is disposed on the first mounting portion.

7. The ablation catheter according to claim 6, characterized in that, Along the radial direction of the support member, in the expanded state, the outer diameter of the first body is larger than the inner diameter of the outer tube.

8. The ablation catheter according to claim 6, characterized in that, Along the radial direction of the support member, in the expanded state, the outer diameter of the first body is smaller than the inner diameter of the outer tube.

9. The ablation catheter according to claim 4, characterized in that, The first mounting portion is provided with a groove for embedding the effect device.

10. The ablation catheter according to claim 4, characterized in that, The first mounting part is provided with a snap-fit ​​part, and the first mounting part is snapped into the effect device through the snap-fit ​​part.

11. The ablation catheter according to claim 1, characterized in that, The effect device is an electrode, and the effect device includes at least one of a cylindrical electrode and a sheet electrode.

12. The ablation catheter according to claim 11, characterized in that, The electrode is a sheet electrode, comprising electrode pads, an electrolytic copper layer, a substrate layer, a constantan layer, a second insulating layer, and constantan pads stacked sequentially. The electrode pads cover the electrolytic copper layer, a first insulating layer surrounds the periphery of the electrolytic copper layer, a second insulating layer is disposed on the constantan layer, and the constantan pads cover at least a portion of the constantan layer. The electrolytic copper layer and the constantan layer are located on opposite sides of the substrate layer, and interconnected vias are provided between the electrolytic copper layer, the substrate layer, and the constantan layer to form a thermocouple between the electrolytic copper layer and the constantan layer.

13. The ablation catheter according to claim 3, characterized in that, The support component includes a second body and a second mounting portion. The second body is a flexible snake-bone tube, and the outer diameter of the second body is smaller than the inner diameter of the outer tube. The proximal end of the second body is connected to the distal end of the inner tube, and the distal end of the second body is open to form a plurality of second free ends. The second mounting portion is located at the second free ends for mounting the effect device. Along the axial direction of the support member, the distances between the plurality of second free ends and the distal end of the inner tube decrease sequentially, and the plurality of second free ends are distributed circumferentially along the second body; the second mounting portion is radially outwardly bent relative to the second body so that the second mounting portion is located outside the second body.

14. The ablation catheter according to claim 1, characterized in that, The ablation catheter also includes: A guidewire is movably inserted through the catheter and the support member, with the distal end of the guidewire extending beyond the distal end of the support member.

15. An ablation device, characterized in that, Includes the ablation catheter according to any one of claims 1-14.

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