Ablation catheter and ablation equipment

Abstract

The embodiment of the invention 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, and in particular, to an ablation catheter and an ablation device. Background Art

[0002] Catheter ablation is used to treat various types of arrhythmias, tumors, etc. The ablation catheter plays a role in energy conduction and target lesion tissue positioning during surgery, and is a tool for implementing ablation. The ablation catheter generally includes a catheter, an electrode stent, and a traction wire. The distal end of the catheter is the electrode stent, and the proximal end of the electrode stent is connected to the distal end of the catheter. The traction wire is passed through the catheter and the electrode stent, and the traction wire is connected to the distal end of the electrode stent. Generally, the electrode stent is driven to switch between the contracted state and the expanded state by pulling the traction wire, but the setting of the traction wire will increase the contraction diameter of the distal end of the catheter in the contracted state, affecting the external dimensions of the distal end of the ablation catheter. Summary of the invention

[0003] The embodiments of the present application provide an ablation catheter and an ablation device, which can reduce the convergence 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, an embodiment of the present application provides an ablation catheter, which includes a catheter, a radially contractible support component and an effector device, wherein the support component is gathered close to 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 device is arranged at the distal end of the support component; wherein the catheter includes 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 restraining force to keep the support component in a contracted state, and after the support component extends out of the outer tube, the support component loses the restraining force of the outer tube and is restored from the contracted state to the expanded state.

[0005] In this solution, the catheter includes an inner tube and an outer tube, the outer tube is sleeved on the inner tube, the support component is arranged at the distal end of the inner tube, and the support component can be contracted in the radial direction. When the outer tube moves relative to the inner tube until the support component is located inside the outer tube, the outer tube can provide a circumferential restraining force to the support component, maintain the support component in a contracted state, withdraw the outer tube in the proximal direction, extend the support component outside the outer tube, and automatically reset the support component to an expanded state. The diameter of the support component becomes larger, the support component adheres to the wall, and ablation of the target ablation position is achieved through the effect device on the support component. That is, the mutual switching of the support component between the expanded state and the contracted state is achieved by the relative movement of the outer tube and the inner tube in the axial direction. Compared with the ablation catheter in the prior art that needs to set a traction wire to pull the support component to achieve the morphological switching, the setting of the traction wire is omitted, so that the convergence diameter of the distal end of the catheter is smaller, and the size of the distal end of the catheter can be reduced, so that the catheter can pass through a small-sized sheath / guide catheter, thereby reducing the patient's puncture wound and reducing the risk of complications. Similarly, the catheter is smaller in size, and both the femoral artery and radial artery access can be selected, which increases the possibility of different surgical accesses and provides a wider range of choices for medical staff. In addition, the ablation catheter does not need to be pulled by a traction wire, and the distal end of the support component is opened, which simplifies the structure of the support component. Compared with a cage-type frame with a closed distal end of the support component, the support component with an open distal end has a stronger radial contraction ability and reset ability, and it is easier to achieve effective wall adhesion of effect devices such as electrodes on the support component. In some embodiments, along the axial direction of the outer tube, the outer tube includes a delivery segment, a transition segment and a soft segment distributed in sequence, and the soft segment is located at the distal end of the outer tube; the elastic modulus of the delivery segment is greater than the elastic modulus of the transition segment, and the elastic modulus of the transition segment is greater than the elastic modulus of the soft segment.

[0006] In the above technical solution, the distal end of the outer tube is provided with a soft-hard transition section, and the distal end of the outer tube is a soft section with a certain bending deformation ability, so that when the catheter needs to ablate the opening of a natural cavity of the human body, such as a blood vessel trunk, the risk of the distal end of the catheter slipping off the blood vessel trunk can be avoided due to the distal end of the outer tube being too hard. In addition, the distal end of the outer tube is a gradual distribution of soft and hard sections, and the outer tube has a certain bending performance and strong adaptability, which can facilitate the catheter to be fixed at the opening of the blood vessel trunk for ablation.

[0007] In some embodiments, there are multiple effect devices, and the multiple effect devices are distributed at intervals along the circumferential direction and axial direction of the support component, and the effect devices do not overlap in the axial projection of the support component.

[0008] In the above technical solution, multiple effect devices are spaced apart in the axial direction and circumferential direction of the support component, so that the multiple effect devices on the support component do not overlap in the axial direction, reducing the risk of overablation. In addition, the multiple effect devices on the support component are spaced apart in 360° of the circumference of the support component, so as to achieve the purpose of full quadrant ablation of the target ablation area by the ablation catheter.

[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 a plurality of unit grids connected to each other, and the first body can shrink and deform in the radial direction of the support component; the distal end of the first body is openly arranged to form a plurality of first free ends at the distal end of the support component, and the first mounting portion is located at the first free end for installation of the effect device; wherein, along the axial direction of the support component, the distances between the plurality of first free ends and the inner tube decrease successively, and the plurality of first free ends are distributed at intervals along the circumference of the first body; preferably, the first mounting portion is arranged colinearly with the extension direction of the first body.

[0010] In the above technical solution, the support component includes a first body and a first mounting portion. The first body is a mesh structure. The first body can shrink and deform in the radial direction. A plurality of 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 successively, so that the plurality of first free ends are distributed in sequence along the axial direction of the first body. On the one hand, a plurality of effect devices can be respectively arranged on the first mounting portions on each first free end, so that the plurality of effect devices can be automatically distributed in the axial and circumferential directions of the support component, and the arrangement of the effect devices is simple and fast. On the other hand, the plurality of first free ends of the first body are distributed in sequence along the axial direction of the first body, so that the density of the unit grid of the same cross section at the distal end of the first body is smaller, the radial shrinkage ability and reset ability of the distal end of the support component are stronger, and it is easier to achieve effective wall adhesion of effect devices such as electrodes on the support component.

[0011] The first mounting portion is arranged colinearly with the extension direction of the first body, the effect device is arranged on the first mounting portion, the first mounting portion and the first body are contracted and expanded synchronously, and the effect device such as an electrode can be effectively attached to the wall through the expansion of the first body, and the installation stability of the effect device on the first body is high.

[0012] In some embodiments, the plurality of unit grids include a first unit grid and a second unit grid, the shapes of the first unit grid and the second unit grid 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. Furthermore, the number of the second unit grids is multiple, and the multiple second unit grids are arranged along the circumference and / or axial direction of the support component.

[0013] In the above technical solution, by dividing a plurality of unit grids into a first unit grid and a second unit grid, the area of ​​the second unit grid is an integer multiple of the area of ​​the first unit grid, which is equivalent to obtaining the second unit grid after targeted wire reduction of the stent wire of the first unit grid on the support component. While satisfying the overall stability of the support component, the density of the stent wire at the corresponding position of the same cross-section on the support component is different, thereby reducing the contraction diameter of the corresponding position on the support component, and having a wider range of applicability, so that the catheter can pass through a small-sized sheath / guide catheter.

[0014] Since the density of the stent wire at the distal end of the first body is relatively small, the contraction diameter of the distal end of the first body is relatively small, and a portion of the first unit grid can be set at the distal end of the first body. The closer the first body is to the distal end of the inner tube, the larger the contraction diameter of the support component in the contracted state. Therefore, by setting the second unit grid in the area closer to the distal end of the inner tube on the first body, the density of the stent wire of the first body close to the inner tube position can be effectively controlled, so that the density of the stent wire at the proximal position of the first body is smaller, thereby reducing the contraction diameter of the proximal end of the first body in the contracted state, making the diameter difference of the first body in the contracted state smaller, and making the contraction diameter of the first body as a whole smaller, so that the catheter can pass through a small-sized sheath tube / guide catheter.

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

[0016] In some embodiments, the first mounting portion is bent radially outward relative to the first body so that the first mounting portion is located radially outside the first body, and the effect device is disposed on the first mounting portion.

[0017] In the above technical solution, the first mounting portion is bent relative to the first body along the radial outer side of the first body, that is, the first mounting portion can expand radially outward relative to the first body and is located on the radial outer side of the first body. The effect device is mounted on the first mounting portion, so that the effect device can rely on the radial expansion and deformation of the first body and the first mounting portion to achieve the wall attachment of the effect device, such as an electrode. On the one hand, compared with the method in which the first body expands as a whole and then drives the first mounting portion to expand, the first mounting portion is expanded relative to the first body, so that the first body itself expands slightly or not at all in the radial direction, which can reduce the outer diameter of the first body, thereby reducing the size of the support component. On the other hand, when the outer tube slides relative to the distal end of the inner tube, the outer tube only needs to squeeze the support component to contract inward, and the resistance encountered is smaller, which makes it easier to quickly switch the contracted state and expanded state of the support component.

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

[0019] In the above technical solution, when the support component is in an expanded state, the outer diameter of the first body is larger than the inner diameter of the outer tube, that is, both the first mounting portion and the first body can shrink and deform in the radial direction. After the restraining force of the outer tube is lost, the first body itself expands radially, and the first mounting portion expands radially again on the basis of the first body. The radial deformation amplitude of the support component is satisfied by both the first mounting portion and the first body, which can ensure that the first body provides stable support to the first mounting portion while meeting the radial expansion amplitude requirement of the support component.

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

[0021] In the above technical solution, when the support component is in an expanded state, the outer diameter of the first body is smaller than the inner diameter of the outer tube, so that the first body does not shrink or expand in the radial direction, and the support component is deformed in the radial direction of the first body through the first mounting portion, thereby achieving the wall adhesion of the effect device such as the electrode. The first body mainly provides the first mounting portion with a mounting function, and the radial deformation amplitude requirement 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 sizes.

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

[0023] In the above technical solution, by providing a groove on the first mounting portion, the groove can accommodate at least part of the effect device, so that after the effect device is installed in the groove of the first mounting portion, the radial dimension of the support component is smaller. On the other hand, the groove can limit the effect device, so that the installation stability of the effect 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 buckled with the effect device through the buckle portion.

[0025] In the above technical solution, a snap-fit ​​portion is provided on the first mounting portion, and the effect device is snap-fitted and fixed to the snap-fit ​​portion of the first mounting portion. While ensuring the installation stability of the effect device on the first mounting portion, the installation method of the effect device is simpler, and the disassembly and assembly of the effect device is convenient and quick, and easy for subsequent maintenance and replacement.

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

[0027] In the above technical solution, the effect device is an electrode, and the shape of the electrode can be a circular 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 stacked in sequence, the electrode pad is covered on the electrolytic copper layer, a first insulating layer is provided around the outer periphery of the electrolytic copper layer, the second insulating layer is provided on the constantan layer, and the constantan pad covers at least a portion of the constantan layer; the electrolytic copper layer and the constantan layer are respectively 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, so that a temperature measuring thermocouple is formed between the electrolytic copper layer and the constantan layer.

[0029] In the above technical solution, the electrode is a sheet electrode, and the electrode is formed by stacking an electrolytic copper layer and a constantan layer. The electrolytic copper layer and the constantan layer are connected through vias to form a temperature measuring thermocouple, and the electrode pad is covered on the electrolytic copper layer, that is, gold is deposited on the electrolytic copper layer to form an electrode surface. A first insulating layer is provided around the outer periphery of the electrolytic copper layer to play an insulating role. When the electrode automatically expands following the supporting component, the electrode pad of the electrode fits with the inner wall of a natural cavity of the human body, such as a blood vessel, to achieve ablation. A constantan pad is provided at the tail end of the constantan layer, which can be used to connect to the handle through a wire, and a second insulating layer covers the constantan layer to play an insulating and protective role for the constantan layer. That is, the dual functions of ablation and temperature measurement can be achieved through the sheet electrode.

[0030] In some embodiments, the support component includes a second body and a second mounting portion, the second body is a flexible serpentine 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, and the second mounting portion is located at the second free end for installation of the effect device; wherein, along the axial direction of the support component, the distances between the plurality of second free ends and the distal end of the inner tube decrease successively, and the plurality of second free ends are distributed at intervals along the circumference of the second body; the second mounting portion is bent radially outward relative to the second body so that the second mounting portion is located on the outside of the second body.

[0031] In the above technical solution, by adopting the second body as a snake tube stent, the bending performance of the support component is better, which can be applied to relatively curved blood vessel branches and has a wider range of applications. In addition, the distances between the multiple second free ends and the distal end of the inner tube are successively reduced, and the multiple second free ends are spaced along the circumference of the second body. Multiple effect devices can be respectively arranged on the second mounting portion on each second free end, so that the multiple effect devices can be automatically distributed in the axial direction and circumferential direction of the support component. The arrangement of the effect devices is simple and fast. Compared with the second body, the multiple second free ends are radially expanded outwardly, and the diameter of the second body itself is smaller than the inner diameter of the outer tube. When the support component switches between the contraction state and the expansion state, the radial size of the second body itself does not change, and the second mounting portion can be bent and deformed in the radial direction, thereby realizing the adhesion of the effect device such as the electrode to the wall and the contraction and expansion of the support component. When the outer tube slides in the distal direction relative to the inner tube, the outer tube squeezes the second free end and the second mounting portion, so that the first mounting portion contracts and deforms radially toward the second body, and the outer tube maintains the support component in a contracted state. When the outer tube moves proximally until it is separated from the supporting component, the second body itself does not undergo radial expansion and deformation. After the second mounting portion loses the restraining force of the outer tube, it expands outward under the resetting action, so as to achieve ablation of the target ablation area through the effector device.

[0032] In some embodiments, the ablation catheter further comprises a guide wire, which is movably disposed through the catheter and the support component, and the distal end of the guide wire can extend out of the distal end of the support component.

[0033] In the above technical solution, the guide wire can be extended out of the distal end of the support component to find the target branch blood vessel. The guide wire can be extended out of the catheter or retracted into the catheter without being exposed.

[0034] In a second aspect, an embodiment of the present application further provides an ablation device, which includes the ablation catheter in any of the aforementioned embodiments.

[0035] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A schematic diagram of the structure of an ablation catheter provided in some embodiments of the present application;

[0038] Figure 2 A schematic diagram of the structure of a support component in an ablation catheter provided in some embodiments of the present application;

[0039] Figure 3 for Figure 2 A schematic diagram of the structure of the middle support component from another angle;

[0040] Figure 4 A schematic diagram of a structure in which the first mounting portion of an ablation catheter provided in some embodiments of the present application is a buckle portion;

[0041] Figure 5 A schematic diagram of the structure of a first mounting portion in an ablation catheter provided in other embodiments of the present application;

[0042] Figure 6 A schematic diagram of the structure of a support component in an ablation catheter provided in other embodiments of the present application;

[0043] Figure 7 A schematic diagram of a structure in which a first mounting portion in a supporting component of an ablation catheter provided in some embodiments of the present application can expand relative to a first body;

[0044] Figure 8 for Figure 7 a side view of the middle support member;

[0045] Fig. 9 for Figure 7 A schematic diagram of the local structure of the middle support component from another angle;

[0046] Fig.10 for Figure 7 A schematic diagram of a structure in which a sheet electrode is mounted on a middle support component;

[0047] Fig.11 A schematic diagram of a structure in which a supporting component in an ablation catheter is a snake tube provided in some embodiments of the application;

[0048] Fig.12 A schematic diagram of a structure in which the supporting component of the ablation catheter provided in some embodiments of the application is a snake tube and the distal end is closed;

[0049] Fig.13 A partial exploded schematic diagram of a sheet-shaped electrode in an ablation catheter provided for some embodiments of the application;

[0050] Fig.14 A schematic diagram of the structure of a tubular electrode in an ablation catheter provided in some embodiments of the application;

[0051] Fig.15 A schematic diagram of a structure in which the electrode in the ablation catheter is a tubular electrode provided for other embodiments of the application;

[0052] Fig.16 A schematic diagram of the structure of an ablation catheter in which an electrode is a sheet-shaped electrode with a bending portion before assembly, provided for application of other embodiments;

[0053] Fig.17 The present invention is a schematic structural diagram of an ablation catheter in which electrodes are assembled as sheet-shaped electrodes with bending portions 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 portion; 241-groove; 242-buckle portion; 25-second body; 26-second mounting portion; 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-via; 39-third insulating layer; 301-main body; 302-bending portion; 40-guide wire. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0056] 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 present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0057] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0058] In the description of the embodiments of the present application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0059] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0060] The present application embodiment provides an ablation catheter, please refer to Figures 1 to 12 The ablation catheter 100 includes a catheter 10, a radially contractible support component 20 and an effect device 30, wherein the support component 20 is gathered close to one end of the catheter 10 to form a proximal end 21 of the support component 20, and the distal end 22 of the support component 20 is open; the effect device 30 is arranged at the distal end 22 of the support component 20; wherein, the catheter 10 includes an inner tube 11 and an outer tube 12, the proximal end 21 of the support component 20 is connected to 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 component 20 is located in the outer tube 12, the outer tube 12 provides a circumferential restraining force to keep the support component 20 in a contracted state, and after the support component 20 extends out of the outer tube 12, the support component 20 loses the restraining force of the outer tube 12 and is reset from the contracted state to the expanded state.

[0061] In this solution, the catheter 10 includes an inner tube 11 and an outer tube 12, the outer tube 12 is sleeved on the inner tube 11, and the support component 20 is arranged at the distal end of the inner tube 11, and the support component 20 can be contracted in the radial direction. When the outer tube 12 moves relative to the inner tube 11 until the support component 20 is located inside the outer tube 12, the outer tube 12 can provide a circumferential restraining force to the support component 20, maintain the support component 20 in a contracted state, and withdraw the outer tube 12 toward the proximal end 21. After the support component 20 extends out of the outer tube 12, the support component 20 automatically resets to an expanded state, the diameter of the support component 20 increases, and the support component 20 adheres to the wall, and ablation of the target ablation position is achieved through the effect device 30 on the support component 20. That is, the mutual switching of the support component 20 between the expansion state and the contraction state is achieved through the relative axial movement of the outer tube 12 and the inner tube 11. Compared with the ablation catheter in the prior art, which needs to set a traction wire to pull the support component 20 to achieve the shape switching, the setting of the traction wire is omitted, so that the convergence diameter of the distal end of the catheter 10 is smaller, and the distal size of the catheter 10 can be reduced, so that the catheter 10 can pass through a small-sized sheath / guide catheter, thereby reducing the patient's puncture wound and reducing the risk of complications. Similarly, the size of the catheter 10 is smaller, and both the femoral artery and radial artery access can be selected, which increases the possibility of different surgical accesses and gives medical staff a wider range of choices. Furthermore, the ablation catheter 100 does not need to be pulled by a traction wire, and the distal end 22 of the support component 20 is open, thereby simplifying the structure of the support component 20. Compared with a closed cage-type frame with the distal end 22 of the support component 20, the support component 20 with the distal end 22 open has stronger radial contraction and resetting capabilities, and is easier to achieve effective wall adhesion of the effect device 30, such as an electrode, on the support component 20.

[0062] Among them, the radial contraction of the support component 20 means that the support component 20 can shrink and deform in the radial direction. The support component 20 can be a bracket in various forms. The support component 20 can be cast / injected by metal / polymer materials, or heat-welded by metal wires / polymer wires, or curled into a tubular shape after laser engraving of metal sheets / polymer sheets. Specifically, if the base material of the support component 20 is tubular, it can be expanded by a jig and then heated and heat-set, and the temperature of different materials is different. If the base material of the support component 20 is a sheet material, the sheet material can be curled and fixed on the jig, and heated and set. After setting, it can be welded / bonded to form the support component 20. The material of the support component 20 can be metal, memory alloy or polymer material, etc. The support component 20 can be heat-set to realize the self-expansion function of the support component 20.

[0063] The following embodiments are non-limitingly described based on radiofrequency ablation. Those skilled in the art will understand that the following description is only exemplary, and similarly, the ablation catheter provided in this application can be adapted based on the application scenario and can be used in other ablation scenarios such as ultrasonic ablation, laser ablation, cryoablation, chemical ablation, etc.

[0064] The effect device 30 refers to an ablation component that can achieve the ablation function. The effect device 30 can be an electrode for electric field ablation, or an ablation component such as an ultrasonic transducer in ultrasonic ablation. Taking the effect device 30 as an electrode as an example, the shape of the electrode can be a tubular electrode or a sheet electrode. The sheet electrode can make the overall diameter of the support component 20 smaller after convergence. The electrode can also be in the form of a multi-layer composite FPC, integrating the electrode with temperature measurement and ablation.

[0065] In some embodiments, please refer 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 which are sequentially distributed, 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 the elastic modulus of the transition section 122, and the elastic modulus of the transition section 122 is greater than the elastic modulus of the soft section 123. The distal end of the outer tube 12 is provided with a soft-hard transition section 122, and the distal end of the outer tube 12 is a soft section 123, which has a certain bending deformation ability, so that when the catheter 10 needs to ablate the opening of a natural cavity of the human body, such as a blood vessel trunk, the risk of the distal end of the catheter 10 slipping off the blood vessel trunk can be avoided due to the distal end of the outer tube 12 being too hard. In addition, the distal end of the outer tube 12 is a gradual distribution of soft and hard sections, and the outer tube 12 has a certain bending performance and strong adaptability, which can facilitate the catheter 10 to be fixed at the opening of the blood vessel trunk for ablation.

[0066] The natural cavities of the human body can be bronchi, bile ducts, esophagus, gastrointestinal tract, urogenital tract or blood vessels. Taking blood vessels as an example, for example, refractory hypertension can be treated by ablation of renal sympathetic nerves or external carotid nerves, type 2 diabetes can be treated by ablation of nerves near the liver, and metabolic organ functions can be affected by ablation of sympathetic nerves that control visceral organs such as the liver, pancreas, and gastrointestinal tract. In addition, pain can be relieved by ablation of nerves outside peripheral blood vessels.

[0067] The cavities in the following embodiments all take blood vessels as an example, and ablation of renal sympathetic nerves for the treatment of refractory hypertension is used as the application scenario. This is only to facilitate the understanding of the technology by those skilled in the art, and does not exclude the application of the technical solution of this application to other scenarios. It should be understood that each implementation method of this application can be applied to one type of scenario, and those skilled in the art can directly apply it to a variety of treatment scenarios under the instructions of the specification. The application of the technical solution of this application in a variety of similar scenarios falls within the protection scope and implementation methods of this application.

[0068] The diameter of the catheter 10 can be 1.0mm to 2.0mm. Preferably, the diameter of the catheter 10 is 1.0 to 1.7mm. For femoral artery puncture, if an 8F sheath is used, ID2.3mm, OD2.7mm, the puncture site needs to be sutured, and there is a risk of complications; for femoral artery puncture, if a 6F sheath is used, ID1.8mm, OD2.0mm, compression can be used to stop bleeding, and the risk of complications is low; if punctured from the radial artery, an 8F sheath cannot be used, and a 6F sheath must be used, increasing the possibility of different surgical access routes; surgery can also be performed from the brachial artery puncture.

[0069] In some embodiments, please refer to Figure 1 , Figure 2 and Figure 3 , the number of effect devices 30 is multiple, and the multiple effect devices 30 are spaced apart along the circumference and axial direction of the support component 20, and each effect device 30 does not overlap in the axial projection of the support component 20. Multiple effect devices 30 are spaced apart in the axial and circumferential directions of the support component 20, so that the multiple effect devices 30 on the support component 20 do not overlap in the axial direction, reducing the risk of excessive ablation. And the multiple effect devices 30 on the support component 20 are spaced apart on the circumference of the support component 20 at 360°, so as to achieve the purpose of ablation of the entire quadrant of the target ablation area by the ablation catheter 100.

[0070] Among them, the plurality of effect devices 30 are spaced apart along the circumference and axial direction of the support component 20, which means that the plurality of effect devices 30 are spaced apart in the circumference and axial direction of the support component 20. The number of effect devices 30 can be two, four, six or eight, etc., and the number of effect devices 30 is determined according to the actual situation. In this embodiment, the number of effect devices 30 is six, and the six effect devices 30 are equally spaced apart in the circumference of the support component 20, and spaced apart in the axial direction of the support component 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 a plurality of 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 to form a plurality of first free ends 232 at the distal end 22 of the support component 20. The first mounting portion 24 is located at the first free end 232 for installation of the effect device 30. Along the axial direction of the support component 20, the distances between the plurality of first free ends 232 and the inner tube 11 decrease successively, and the plurality of first free ends 232 are distributed at intervals along the circumference of the first body 23.

[0072] The support component 20 includes a first body 23 and a first mounting portion 24. The first body 23 is a mesh structure. The first body 23 can shrink and deform in the radial direction. A plurality of first free ends 232 are formed at the distal end 22 of the first body 23, and the distance between each first free end 232 and the inner tube 11 decreases successively, so that the plurality of first free ends 232 are sequentially spaced and distributed along the axial direction of the first body 23. On the one hand, a plurality of effect devices 30 can be respectively arranged on the first mounting portions 24 on each first free end 232, so that the plurality of effect devices 30 can be automatically spaced and distributed in the axial direction and circumferential direction of the support component 20, and the arrangement of the effect devices 30 is simple and fast. On the other hand, the plurality of first free ends 232 of the first body 23 are sequentially spaced and distributed along the axial direction of the first body 23, so that the density of the unit grid 231 of the same cross section of the distal end 22 of the first body 23 is smaller, the radial shrinkage ability and reset ability of the distal end 22 of the support component 20 are stronger, and it is easier to achieve the effective wall attachment of the effect devices 30 such as electrodes on the support component 20.

[0073] The shapes of the unit grids 231 in the support member 20 may be the same or different. In this embodiment, the shapes of the unit grids 231 in the support member 20 are exactly the same. Further, the areas of the unit grids 231 in the first body 23 may be equal or different, depending on the actual situation.

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

[0075] The first mounting portion 24 and the first body 23 may be arranged in a colinear manner in the extending direction, that is, the first mounting portion 24 is arranged to extend along the extending direction of the first body 23, and the effect device 30 expands or contracts with the first body 23. Of course, the first mounting portion 24 and the first body 23 may also be arranged at an inclined angle, for example, the first mounting portion 24 may be located on the radially outer side of the first body 23, the first mounting portion 24 is not in the same plane as the first body 23, and the first mounting portion 24 may expand radially relative to the first body 23, so that the effect device 30 is arranged on the first mounting portion 24, and the effect device 30 may expand and contract 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 a collinear manner with the extension direction of the first body 23. The first mounting portion 24 is arranged in a collinear manner with the extension direction of the first body 23, and the effect device 30 is arranged on the first mounting portion 24. The first mounting portion 24 and the first body 23 are contracted and expanded synchronously. Through the expansion of the first body 23, the effect device 30, such as an electrode, can be effectively attached to the wall, and the installation stability of the effect device 30 on the first body 23 is high.

[0077] In some embodiments, please refer to Figure 6 , the plurality of unit grids 231 include a first unit grid 2311 and a second unit grid 2312, both of which are parallelograms; 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, the area of ​​the second unit grid 2312 is an integer multiple of the area of ​​the first unit grid 2311, which is equivalent to obtaining the second unit grid 2312 by targeted wire reduction of the stent wire of the first unit grid 2311 on the support component 20. Under the condition of satisfying the overall stability of the support component 20, the density of the stent wire at the corresponding position of the same cross section on the support component 20 is different, thereby reducing the bundle diameter at the corresponding position on the support component 20, and having a wider range of application, so that the catheter 10 can pass through a small-sized sheath tube / guide catheter.

[0078] The first unit grid 2311 and the second unit grid 2312 may be in a rhombus shape. 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 may be two, four or eight times the area of ​​the first unit grid 2311, etc., which may be determined according to actual conditions.

[0079] In this 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 multiple stent wires end to end, and the length of each stent wire in the second unit grid 2312 is twice the length of the stent wire in the first unit grid 2311. In actual manufacturing, the stent wires in the local position of the support component 20 are hollowed out and removed, that is, the area enclosed by the four first unit grids 2311 is used and the wire is reduced in this area, so that the four first unit grids 2311 form a second unit grid 2312 with a larger area. In the case of the same area, the stent wires of the second unit grid 2312 are more dispersed than the stent wires of the first unit grid 2311.

[0080] It can be understood that the density of the unit grid 231 gradually increases as the first body 23 points from the distal end 22 to the proximal end 21, the number of stent wires of the first body 23 is greater, and the wires of the effect device 30 on the support component 20 are passed through the cavity 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 component 20, the denser the number of stent wires of the first body 23, and the more wires of the effect device 30, the denser the wire distribution, and accordingly, the larger the convergence diameter of the support component 20 after the overall convergence.

[0081] In some embodiments, please refer 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 filaments at the distal end 22 of the first body 23 is relatively small, the contraction diameter of the distal end 22 of the first body 23 is relatively small, and a portion of the first unit grid 2311 can be set at the position of the distal end 22 of the first body 23. The closer the first body 23 is to the distal end 22 of the inner tube 11, the larger the contraction diameter of the support member 20 in the contracted state. Therefore, by setting the second unit grid 2312 in the area closer to the distal end 22 of the inner tube 11 on the first body 23, the density of the stent filaments of the first body 23 close to the position of the inner tube 11 can be effectively controlled, so that the density of the stent filaments at the position of the proximal end 21 of the first body 23 is smaller, thereby reducing the contraction diameter of the proximal end 21 of the first body 23 in the contracted state, making the diameter difference of the first body 23 in the contracted state smaller, and making the overall contraction diameter of the first body 23 smaller, so that the catheter 10 can pass through a small-sized sheath tube / guide catheter 10.

[0083] In some embodiments, there are multiple second unit grids 2312, and the multiple second unit grids 2312 are arranged along the circumference and / or axial direction of the support component 20. The multiple second unit grids 2312 are arranged along the circumference and / or axial direction of the support component 20, and the position distribution of the second unit grids 2312 on the support component 20 can be selected according to actual conditions, and the distribution of the second unit grids 2312 is more flexible.

[0084] In some embodiments, please refer to Figures 7 to 10, the first mounting portion 24 is bent radially outward relative to the first body 23, so that the first mounting portion 24 is located on the radially outer side of the first body 23, and the effect device 30 is arranged on the first mounting portion 24. The first mounting portion 24 is bent radially outward relative to the first body 23, that is, the first mounting portion 24 can expand radially outward relative to the first body 23 and is located on the radially outer side of the first body 23, and the effect device 30 is installed on the first mounting portion 24, so that the effect device 30 can rely on the radial expansion and deformation of the first body 23 and the first mounting portion 24 to achieve the wall attachment of the effect device 30, such as an electrode. On the one hand, compared with the method in which the first body 23 expands as a whole and then drives the first mounting portion 24 to expand, the first mounting portion 24 is allowed to expand relative to the first body 23, so that the first body 23 itself expands slightly or not in the radial direction, which can reduce the outer diameter of the first body 23, thereby reducing the size of the support component 20. On the other hand, when the outer tube 12 slides relatively toward the distal end 22 of the inner tube 11, the outer tube 12 only needs to squeeze the support component 20 to shrink inward, and the resistance encountered is smaller, making it easier for the support component 20 to quickly switch between the contracted state and the expanded state.

[0085] Among them, when the support component 20 is in an expanded state, 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, that is, the first body 23 of the support component 20 cannot shrink in the radial direction, and the first mounting portion 24 of the support component 20 can shrink and deform in the radial direction relative to the first body 23, thereby realizing the shrinkage deformation of the support component 20.

[0086] When the outer diameter of the first body 23 is larger than the inner diameter of the outer tube 12, the first body 23 and the first mounting portion 24 can both expand and deform in the radial direction, that is, the first body 23 and the first mounting portion 24 can both expand or contract, and the first mounting portion 24 can expand secondary relative to the first body 23. The first mounting portion 24 is located on the radially outer side of the first body 23.

[0087] When 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 shrink or expand in the radial direction, and the support component 20 expands or shrinks in the radial direction of the first body 23 through the first mounting portion 24, thereby achieving shrinkage or expansion deformation of the support component 20.

[0088] In some embodiments, please refer to Figures 7 to 10, along the radial direction of the support component 20, when the support component 20 is in the expanded state, the outer diameter of the first body 23 is greater than the inner diameter of the outer tube 12. When the support component 20 is in the expanded state, the outer diameter of the first body 23 is greater than the inner diameter of the outer tube 12, that is, both the first mounting portion 24 and the first body 23 can shrink and deform in the radial direction. After the restraining force of the outer tube 12 is lost, the first body 23 itself expands radially, and the first mounting portion 24 expands radially again on the basis of the first body 23. The radial deformation amplitude of the support component 20 is satisfied by both the first mounting portion 24 and the first body 23, which can ensure that the first body 23 provides stable support to the first mounting portion 24 while satisfying the radial expansion amplitude requirement of the support component 20.

[0089] In some embodiments, along the radial direction of the support component 20, when the support component 20 is in the expanded state, the outer diameter of the first body 23 is smaller than the inner diameter of the outer tube 12. When the support component 20 is in the expanded state, the outer diameter of the first body 23 is smaller than the inner diameter of the outer tube 12, so that the first body 23 does not shrink or expand and deform in the radial direction, and the support component 20 expands and deforms in the radial direction of the first body 23 through the first mounting portion 24, thereby achieving the wall adhesion of the effect device 30, such as an electrode. The first body 23 mainly provides the first mounting portion 24 with an installation function, and the radial deformation amplitude requirement of the support component 20 is met through 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 blood vessels with small sizes.

[0090] In some embodiments, the support component 20 is a mesh structure formed by cutting and carving a tube. The support component 20 is made by cutting a tube, and the manufacturing process of the support component 20 is simple and easy to implement.

[0091] There are multiple installation methods between the first installation part 24 and the effect device 30, and the effect device 30 can be connected to the first installation part 24 by means of snap connection, embedding or interference fit. Of course, in order to improve the connection stability between the effect device 30 and the first installation part 24, no matter which mechanical connection method is used, the effect device 30 and the first installation part 24 can be finally bonded and fixed, so as to further improve the installation stability of the effect device 30 on the first installation part 24.

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

[0093] In some embodiments, please refer to Figure 4 The first mounting portion 24 is provided with a buckle portion 242, and the first mounting portion 24 is buckled with the effect device 30 through the buckle portion 242. By providing the buckle portion 242 on the first mounting portion 24, the effect device 30 is buckled and fixed with the buckle portion 242 of the first mounting portion 24, while ensuring the installation stability of the effect device 30 on the first mounting portion 24, the installation method of the effect device 30 is simpler, and the disassembly and assembly of the effect device 30 is convenient and quick, and it is easy to maintain and replace later.

[0094] The first mounting portion 24 includes a U-shaped clamping portion, and the end of the clamping portion away from the first free end 232 has a clamping opening for the effect device 30 to be clamped in, and the clamping opening can move toward each other under the action of the extrusion force, so that the effect device 30 passes through the clamping opening of the clamping portion and is clamped in the clamping portion. A stopper is protruding from the clamping opening, and the stopper is used to prevent the effect device 30 from being separated from the first mounting portion 24.

[0095] In some embodiments, the effect device 30 is an electrode, see Figures 14 to 16 The electrode includes at least one of a circular tube electrode and a sheet electrode. The shape of the electrode can be a circular 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.

[0096] The tubular electrode can have many conditions, for example, Fig.14 As shown, the electrode can be a straight tubular electrode. Fig.15 As shown, the electrode may also be a tubular electrode with a curved arc.

[0097] In addition, when the electrode is a sheet-shaped electrode, the sheet-shaped electrode may be a planar electrode or a sheet-shaped electrode with a bent portion. Fig.16 and Fig.17 The schematic diagram of the structure of the sheet electrode with a bent portion before and after assembly is shown. Fig.16As shown, the sheet electrode includes a main body 301 and a bending portion 302. The number of the bending portions 302 can be multiple, and the multiple bending portions 302 are distributed at intervals around the main body 301. The bending portion 302 can be bent relative to the main body 301. Before the sheet electrode with the bending portion is assembled, the bending portion 302 and the main body 301 are in the same plane. Fig.17 As shown, the multiple bending portions 302 are bent toward the center direction of the main body 301 , and the orthographic projection of the bending portions falls on the orthographic projection of the thickness direction of the main body. The sheet electrode can be clamped on the supporting component 20 through the multiple bending portions 302 .

[0098] In some embodiments, please refer to Fig.13 The electrode is a sheet electrode, and 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 which are stacked in sequence. The electrode pad 31 is covered on the electrolytic copper layer 32, a first insulating layer 33 is provided on the outer periphery of the electrolytic copper layer 32, the second insulating layer 36 is provided 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 interconnected vias 37 are provided between the electrolytic copper layer 32, the substrate layer 34 and the constantan layer 35, so that a temperature measuring thermocouple is formed between the electrolytic copper layer 32 and the constantan layer 35.

[0099] By adopting a sheet electrode, the electrode is stacked by an electrolytic copper layer 32 and a constantan layer 35, and the electrolytic copper layer 32 and the constantan layer 35 are connected through a via 37 to form a temperature measuring thermocouple, and the electrode pad 31 is covered on the electrolytic copper layer 32, that is, gold is deposited on the electrolytic copper layer 32 to form an electrode surface. A first insulating layer 33 is provided around the outer periphery of the electrolytic copper layer 32 to play an insulating role. When the electrode automatically expands following the support component 20, the electrode pad 31 of the electrode fits with the inner wall of the blood vessel to achieve ablation. By providing a constantan pad at the tail end of the constantan layer 35, it can be used to connect to the handle through a wire, and the second insulating layer 36 covers the constantan layer 35 to play an insulating and protective role for the constantan layer 35. That is, the dual functions of ablation and temperature measurement can be achieved through the sheet electrode.

[0100] The electrode further includes a third insulating layer 39 , which is disposed on the electrode pad 31 .

[0101] In some embodiments, please refer to Fig.11The support component 20 includes a second body 25 and a second mounting portion 26. The second body 25 is a flexible snake tube, and the outer diameter of the second body 25 is smaller than the inner diameter of the outer tube 12. The proximal end 21 of the second body 25 is connected to the distal end 22 of the inner tube 11, and the distal end 22 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 end for installation of the effect device 30. In particular, along the axial direction of the support component 20, the distances between the plurality of second free ends and the distal end 22 of the inner tube 11 decrease successively, and the plurality of second free ends are distributed at intervals along the circumference of the second body 25. The second mounting portion 26 is bent radially outward relative to the second body 25 so that the second mounting portion 26 is located outside the second body 25.

[0102] By adopting the second body 25 as a snake tube stent, the bending performance of the support component 20 is better, and it can be applied to relatively curved blood vessel branches, and the application range is wider. In addition, the distances between the multiple second free ends and the distal end of the inner tube 11 decrease successively, and the multiple second free ends are distributed at intervals along the circumference of the second body 25. Multiple effect devices 30 can be respectively arranged on the second mounting portion 26 on each second free end, so that the multiple effect devices 30 can be automatically distributed in the axial direction and circumferential direction of the support component 20. The arrangement of the effect devices 30 is simple and fast. Compared with the second body 25, the multiple second free ends are radially expanded outwardly, and the diameter of the second body 25 itself is smaller than the inner diameter of the outer tube 12. When the support component 20 switches between the contraction state and the expansion state, the radial size of the second body 25 itself does not change, and the second mounting portion 26 can be bent and deformed in the radial direction, thereby realizing the wall adhesion of the effect device 30 and the contraction and expansion of the support component 20. When the outer tube 12 slides toward the distal end 22 relative to the inner tube 11, the outer tube 12 squeezes the second free end and the second mounting portion 26, so that the first mounting portion 24 contracts and deforms radially toward the second body 25, and the outer tube 12 maintains the support component 20 in a contracted state. When the outer tube 12 moves toward the proximal end 21 until the outer tube 12 separates from the support component 20, the second body 25 itself does not radially expand and deform, and the second mounting portion 26 expands outwards under the resetting action after losing the restraining force of the outer tube 12, so as to facilitate ablation of the target ablation area through the effector 30.

[0103] Of course, please refer to Fig.12 The distal end of the second body 25 can also be closed, and the distal end of the second body 25 is a conical end. In this way, the second body 25 can be provided for the guide wire 40 to pass through, and the distal end of the second body 25 can provide support and guidance functions for the guide wire 40.

[0104] In some embodiments, please refer to Figure 1The ablation catheter 100 further includes a guide wire 40, which is movably disposed in the catheter 10 and the support member 20, and the distal end 22 of the guide wire 40 can extend out of the distal end 22 of the support member 20. Through the arrangement of the guide wire 40, the guide wire 40 can extend out of the distal end 22 of the support member 20, and play a role in finding the target branch blood vessel. The guide wire 40 can extend out of the catheter 10, or can be withdrawn in the catheter 10 without being exposed.

[0105] The embodiment of the present application further provides an ablation device, which includes the ablation catheter 100 in any of the aforementioned embodiments.

[0106] It should be noted that, in the absence of conflict, the features in the embodiments of this application may be combined with each other.

[0107] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. 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 contractible support member, wherein the support member is gathered close to one end of the catheter to form a proximal end of the support member, and the distal end of the support member is open; An effector device, disposed at the distal end of the support component; Wherein, the catheter includes 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 restraining force to keep the support component in a contracted state, and after the support component extends out of the outer tube, the support component loses the restraining force of the outer tube and is restored from the contracted state to the expanded 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 in sequence, and the soft section is 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: There are multiple effect devices, and the multiple effect devices are distributed at intervals along the circumferential direction and axial direction of the support component, and the effect devices do not overlap in 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, wherein the first body is a mesh structure formed by interconnecting a plurality of unit grids, and the first body can be contracted and deformed in the radial direction of the support component; the distal end of the first body is openly arranged to form a plurality of first free ends at the distal end of the support component, and the first mounting portion is located at the first free end for mounting the effect device; Wherein, along the axial direction of the supporting component, the distances between the plurality of first free ends and the inner tube decrease in sequence, and the plurality of first free ends are spaced apart and distributed along the circumference of the first body; Preferably, the first mounting portion and the extension direction of the first body are arranged colinearly.

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, the first unit grid and the second unit grid 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; Furthermore, there are multiple second unit grids, and the multiple second unit grids are arranged along the circumferential direction and / or axial direction of the support component.

6. The ablation catheter according to claim 4, characterized in that: The first mounting portion is bent outwardly in the radial direction relative to the first body, so that the first mounting portion is located on the radially outer side of the first body, and the effect device is arranged on the first mounting portion.

7. The ablation catheter according to claim 6, characterized in that: Along the radial direction of the support component, when the support component is in the expanded state, the outer diameter of the first body is greater 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 component, when the support component is in an 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, and the groove is used for embedding the effect device.

10. The ablation catheter according to claim 4, characterized in that: The first mounting portion is provided with a buckle portion, and the first mounting portion is buckled with the effect device through the buckle portion.

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 circular tubular electrode and a sheet electrode.

12. The ablation catheter according to claim 11, characterized in that: The electrode is a sheet electrode, comprising an electrode pad, an electrolytic copper layer, a substrate layer, a constantan layer, a second insulating layer and a constantan pad which are stacked in sequence, the electrode pad being covered on the electrolytic copper layer, a first insulating layer being arranged around the electrolytic copper layer, the second insulating layer being arranged on the constantan layer, and the constantan pad covering at least a portion of the constantan layer; the electrolytic copper layer and the constantan layer being respectively located on opposite sides of the substrate layer, and interconnected vias being arranged between the electrolytic copper layer, the substrate layer and the constantan layer, so as to form a temperature measuring 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 tube, 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, 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 effect device; Among them, along the axial direction of the supporting component, the distances between the multiple second free ends and the distal end of the inner tube decrease successively, and the multiple second free ends are distributed at intervals along the circumference of the second body; the second mounting portion is bent radially outward relative to the second body so that the second mounting portion is located on the outside of the second body.

14. The ablation catheter according to claim 1, characterized in that: The ablation catheter further comprises: A guide wire is movably arranged in the catheter and the support component, and the distal end of the guide wire can extend out of the distal end of the support component.

15. An ablation device, characterized in that: Comprising an ablation catheter according to any one of claims 1-14.

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