Ablation assembly and radiofrequency ablation catheter

Abstract

The invention relates to an ablation assembly and a radiofrequency ablation catheter, a deformation frame body has a contraction state and an unfolding state, an ablation electrode group comprises a plurality of electrode elements distributed on the surface of the deformation frame body, and in the unfolding state of the deformation frame body, the ablation electrode group comprises a plurality of electrode elements; the plurality of electrode elements can be respectively constructed into a plurality of annular track unit groups and a plurality of linear track unit groups in the axial direction and the circumferential direction of the deformation frame body, the annular track unit groups surround the deformation frame body in the circumferential direction, and the linear track unit groups are linearly distributed in the axial direction of the deformation frame body. A plurality of electrode elements in the ablation electrode set form a plurality of annular track unit sets and a plurality of linear track unit sets in the axial direction and the circumferential direction of the deformation frame body, the ablation treatment range in the blood vessel can be greatly expanded along with unfolding of the deformation frame body, operation such as axial movement and circumferential rotation is not needed any more, and the ablation efficiency is improved. Therefore, large-range treatment can be achieved, the treatment efficiency can be effectively improved, the operation difficulty is reduced, and development of the ablation treatment technology is facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to an ablation component and a radiofrequency ablation catheter. Background Art

[0002] Radiofrequency ablation technology mainly relies on radiofrequency therapeutic devices with ablation and cutting functions, and the treatment mechanism is mainly thermal effect. When radiofrequency current flows through biological tissues, the rapid change of the electromagnetic field causes the polarized water molecules in the biological tissues to move at high speed, generating heat (i.e., endogenous thermal effect), causing the water inside and outside the cells to evaporate, dry, shrink and fall off, resulting in aseptic necrosis, thereby achieving the purpose of treatment. Conventional multipolar ablation is generally a superficial ablation in which the radiofrequency electrode discharges to the back plate, and the arrangement of the radiofrequency electrodes cannot cover a larger treatment area, resulting in the treatment effect not being ideal. Summary of the invention

[0003] Based on this, it is necessary to provide an ablation component and a radiofrequency ablation catheter to address at least one of the technical issues mentioned above.

[0004] The present application provides an ablation component, the ablation component comprising:

[0005] A deformable frame, wherein the deformable frame has a contracted state and an expanded state;

[0006] An ablation electrode group, the ablation electrode group comprises a plurality of electrode elements distributed on the surface of the deformable frame, and in the expanded state of the deformable frame, the plurality of electrode elements can be respectively constructed into a plurality of annular trajectory unit groups and a plurality of linear trajectory unit groups in the axial direction and the circumferential direction of the deformable frame, wherein the annular trajectory unit group surrounds the circumference of the deformable frame, and the linear trajectory unit group is linearly distributed along the axial direction of the deformable frame.

[0007] In one embodiment, each of the annular trajectory unit groups forms a radial ablation energy circle in the radial direction of the deformable frame, and adjacent radial ablation energy circles formed by adjacent annular trajectory unit groups do not overlap; and / or,

[0008] Each of the linear track unit groups forms an axial ablation energy circle in the axial direction of the deformable frame, and adjacent axial ablation energy circles formed by adjacent linear track unit groups do not overlap.

[0009] In one embodiment, the plurality of electrode elements in each annular trajectory unit group are arranged in a circular trajectory along the circumference of the deformable frame, and the plane where the circular trajectory is located is perpendicular to the axis of the deformable frame; and / or,

[0010] The spacing between adjacent electrode elements in each annular track unit group is the same; and / or,

[0011] The plurality of electrode elements in each linear track unit group are distributed along the axial direction of the deformable frame in a linear track, and the linear track is parallel to the axis of the deformable frame; and / or,

[0012] The spacing between adjacent electrode elements in each linear track unit group is the same.

[0013] In one embodiment, each of the annular trajectory unit groups forms a radial ablation energy circle in the radial direction of the deformable frame, and between adjacent radial ablation energy circles formed by adjacent annular trajectory unit groups, at least some of the adjacent radial ablation energy circles overlap; and / or,

[0014] Each of the linear track unit groups forms an axial ablation energy circle in the axial direction of the deformable frame, and between adjacent axial ablation energy circles formed by adjacent linear track unit groups, at least some of the adjacent axial ablation energy circles overlap.

[0015] In one embodiment, the plurality of electrode elements in each annular trajectory unit group are arranged in an annular trajectory along the circumference of the deformable frame, and at least some of the planes where adjacent annular trajectories are located have an angle; and / or,

[0016] The plurality of electrode elements in each linear track unit group are distributed in a linear track along the axial direction of the deformable frame, and at least some of the adjacent linear tracks have an angle between them.

[0017] In one embodiment, the electrode element is provided with a medium injection hole, and the medium injection hole is used to transport a cooling medium.

[0018] In one embodiment, the deformable frame comprises:

[0019] A plurality of deformable support rods, each of which is spirally wound circumferentially along the axial direction, and a plurality of electrode elements of the ablation electrode group are arranged on the plurality of deformable support rods, so that the plurality of electrode elements can be respectively constructed into a plurality of annular track unit groups and a plurality of linear track unit groups in the axial direction and the circumferential direction;

[0020] A first bundling element, the first bundling element is connected to the distal ends of the plurality of deformable stent rods;

[0021] A second bundling element is connected to the proximal ends of the plurality of deformable stent rods.

[0022] In one embodiment, at least one of a wire delivery channel and a first medium delivery channel is provided in the deformable support rod, wherein the wire delivery channel is used to pass an energy delivery wire, the energy delivery wire is used to connect the electrode element, and the first medium delivery channel is used to deliver a cooling medium; and / or,

[0023] The first clustering element comprises a first clustering end and a plurality of first clustering support rods, the first clustering end is connected to the distal ends of the plurality of first clustering support rods, the number of the first clustering support rods is the same as the number of the deformable support rods, and the proximal end of each of the first clustering support rods is connected to the distal end of one of the deformable support rods; and / or,

[0024] The second bundling element includes a second bundling end and a plurality of second bundling support rods. The second bundling end is connected to the proximal ends of the plurality of second bundling support rods. The number of the second bundling support rods is the same as the number of the deformable support rods. The distal end of each second bundling support rod is connected to the proximal end of a deformable support rod.

[0025] In one embodiment, a second medium delivery channel is provided in the second cluster support rod, and the second medium delivery channel is used to deliver cooling medium; and / or,

[0026] At least one of the first clustering end and the second clustering end is provided with a central through hole, and the central through hole is used for passing an inner core rod; and / or,

[0027] At least one of the first cluster support rod and the second cluster support rod is an elastic rod; and / or,

[0028] The outer contour diameter formed by the plurality of the first clustering support rods in the first clustering element gradually increases in the direction from the distal end to the proximal end of the first clustering element; and / or,

[0029] The outer contour diameter formed by the plurality of the second clustering support rods in the second clustering element gradually increases in the direction from the proximal end to the distal end of the second clustering element.

[0030] In one embodiment, the deformable frame comprises:

[0031] A delivery support rod is provided with a medium injection channel in the delivery support rod, and the medium injection channel is used for transporting cooling medium.

[0032] In one embodiment, the number of the channel outlets of the medium perfusion channel is the same as the number of the electrode elements, and each of the channel outlets corresponds to one of the electrode elements; or,

[0033] The number of the conveying support rods is the same as the number of the deformable support rods, and the multiple conveying support rods are all spirally wound circumferentially along the axial direction. Each of the conveying support rods corresponds to a deformable support rod, and the number of channel outlets on each conveying support rod is the same as and corresponds to the number of electrode elements on the corresponding deformable support rod.

[0034] In one embodiment, the electrode element is a sleeve-shaped element, the sleeve-shaped element has a sleeve cavity with two ends passing through, and the electrode element is sleeved on the deformable support rod; and / or,

[0035] The electrode element includes at least two unit electrodes, at least one of the unit electrodes is a radio frequency signal receiving electrode, and the remaining unit electrodes are radio frequency signal transmitting electrodes.

[0036] The present application provides a radiofrequency ablation catheter, the radiofrequency ablation catheter comprising:

[0037] An outer sheath tube, wherein the outer sheath tube has an axially penetrating inner cavity;

[0038] An inner core rod, the inner core rod being movably assembled in the inner cavity of the outer sheath tube;

[0039] The ablation component is arranged at the distal end of the outer sheath tube, and the inner core rod is connected to the deformable frame of the ablation component to control the mutual conversion of the deformable frame between the contracted state and the expanded state.

[0040] In the above-mentioned ablation assembly and radiofrequency ablation catheter, the multiple electrode elements in the ablation electrode group are evenly distributed in the circumferential direction of the deformable frame with the help of multiple linear trajectory unit groups. Therefore, during the ablation treatment, the ablation assembly does not need to rotate circumferentially in the blood vessel to achieve ablation treatment of the blood vessel around the circle. At the same time, the multiple electrode elements in the ablation electrode group are also evenly distributed in the axial direction of the deformable frame with the help of multiple annular trajectory unit groups. Therefore, during the ablation treatment, the ablation assembly does not need to move along the axial direction of the blood vessel to achieve ablation treatment of a certain length in the axial direction of the blood vessel.

[0041] It can be seen from this that the multiple electrode elements in the ablation electrode group form multiple annular trajectory unit groups and multiple linear trajectory unit groups in the axial and circumferential directions of the deformable frame. As the deformable frame unfolds, the ablation treatment range in the blood vessel can be greatly expanded, and operations such as axial movement and circumferential rotation are no longer required. A larger range of treatment can be achieved, which can effectively improve treatment efficiency, reduce operational difficulty, and contribute to the development of ablation treatment technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1A schematic diagram of a radiofrequency ablation catheter in a contracted state provided in one embodiment of the present application.

[0043] Figure 2 A schematic diagram of the deployed state of a radiofrequency ablation catheter provided in one embodiment of the present application.

[0044] Figure 3 A schematic diagram of the formation status of a radial ablation energy circle and an axial ablation energy circle provided in one embodiment of the present application.

[0045] Figure 4 A schematic structural diagram of a first bundling element provided in one embodiment of the present application.

[0046] Figure 5 For Figure 4 A top view of the first bundling element is shown.

[0047] Figure 6 A schematic plan view of the assembly of a first bundling element and a deformable frame provided in one embodiment of the present application.

[0048] Figure 7 A schematic structural diagram of a second bundling element provided in one embodiment of the present application.

[0049] Figure 8 For Benru Figure 7 A top view of the second bundling element is shown.

[0050] Fig. 9 A schematic plan view of the assembly of a second bundling element and a deformation frame provided in one embodiment of the present application.

[0051] Fig.10 A schematic diagram of the flow path of the cooling medium provided for one embodiment of the present application.

[0052] Fig.11 A schematic structural diagram of a radiofrequency ablation catheter provided in another embodiment of the present application.

[0053] Fig.12 For Fig.11 A side view of a radiofrequency ablation catheter is shown.

[0054] Fig.13 A schematic diagram of the flow path of a cooling medium provided for another embodiment.

[0055] Fig.14 A schematic structural diagram of a radiofrequency ablation catheter provided in yet another embodiment of the present application.

[0056] Fig.15 A schematic structural diagram of a radiofrequency ablation catheter provided in yet another embodiment of the present application.

[0057] Fig.16and Fig.17 A schematic diagram of the use status of a radiofrequency ablation catheter provided in one embodiment of the present application.

[0058] Figure Number:

[0059] 100, outer sheath; 200, inner core rod; 300, ablation component; 400, delivery tube; 500, blood vessel;

[0060] 1000. Deformable frame; 2000. Ablation electrode set;

[0061] 1100, a deformable support rod; 1200, a conveying support rod;

[0062] 1110, a first bundling element; 1120, a second bundling element;

[0063] 1110a, first cluster end; 1110b, first cluster support rod;

[0064] 1120a, second cluster end; 1120b, second cluster support rod;

[0065] 1120a1, central through hole; 1120b1, second medium delivery channel;

[0066] 1200a, medium perfusion channel;

[0067] 2100, electrode element;

[0068] 2100a, radial ablation energy circle; 2100b, axial ablation energy circle; 2100c, medium perfusion hole;

[0069] 2100d, unit electrode. DETAILED DESCRIPTION

[0070] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0071] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, 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.

[0072] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0073] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0074] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0075] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0076] In order to more clearly describe the structure of the ablation assembly and the radiofrequency ablation catheter, the term "distal end" is defined here to mean the end away from the operator during the surgical operation, and the term "proximal end" is defined here to mean the end close to the operator during the surgical operation. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application. The terms used in this application in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0077] See also Figure 1 and Figure 2 As shown, an ablation component 300 provided in one embodiment of the present application includes a deformable frame 1000 and an ablation electrode group 2000. The deformable frame 1000 has a contracted state and an expanded state. The ablation electrode group 2000 includes a plurality of electrode elements 2100 distributed on the surface of the deformable frame 1000. In the expanded state of the deformable frame 1000, the plurality of electrode elements 2100 can be respectively constructed as a plurality of annular trajectory unit groups and a plurality of linear trajectory unit groups in the axial and circumferential directions of the deformable frame 1000. The annular trajectory unit group surrounds the deformable frame 1000 in the circumferential direction, and the linear trajectory unit group is linearly distributed along the axial direction of the deformable frame 1000.

[0078] Combination Figures 1 to 3 As shown, when the multiple electrode elements 2100 in the ablation electrode group 2000 are arranged on the deformable frame 1000 according to the prescribed arrangement, the multiple electrode elements 2100 can form a certain relative position relationship. As the deformable frame 1000 changes from a contracted state to an expanded state, the multiple electrode elements 2100 in the ablation electrode group 2000 will form a preset arrangement state. The preset arrangement state can be expressed as a certain arrangement rule from the axial direction of the deformable frame 1000, or it can also be expressed as a certain arrangement rule from the circumferential direction of the deformable frame 1000. The material of the electrode element 2100 can be selected from metals or alloy materials with low resistivity and good biocompatibility to improve discharge efficiency, such as gold or platinum-iridium alloy.

[0079] At one viewing angle, if observed from the axial direction of the deformable frame 1000, the multiple electrode elements 2100 in the ablation electrode group 2000 appear to construct multiple annular track unit groups in the axial direction of the deformable frame 1000, each of which is composed of multiple electrode elements 2100 circumferentially surrounding the deformable frame 1000, so that each annular track unit group surrounds the circumference of the deformable frame 1000. At another viewing angle, if observed from the circumferential direction of the deformable frame 1000, the multiple electrode elements 2100 in the ablation electrode group 2000 appear to construct multiple linear track unit groups in the circumferential direction of the deformable frame 1000, each of which is composed of multiple electrode elements 2100 linearly arranged along the axial direction of the deformable frame 1000, so that each linear track unit group is linearly distributed along the axial direction of the deformable frame 1000. That is to say, the multiple annular trajectory unit groups and the multiple linear trajectory unit groups mentioned above are not independent of each other, but are different arrangement states of the multiple electrode elements 2100 in the ablation electrode group 2000 when observed from the axial and circumferential directions of the deformable frame 1000.

[0080] Since the multiple electrode elements 2100 in the ablation electrode group 2000 are evenly distributed in the circumferential direction of the deformable frame 1000 by means of multiple linear track unit groups, the ablation assembly 300 can achieve ablation treatment of the blood vessel 500 in one circle without rotating circumferentially in the blood vessel 500 during ablation treatment. At the same time, the multiple electrode elements 2100 in the ablation electrode group 2000 are evenly distributed in the axial direction of the deformable frame 1000 by means of multiple annular track unit groups, so the ablation assembly 300 can achieve ablation treatment of a certain length in the axial direction of the blood vessel 500 without moving in the axial direction of the blood vessel 500 during ablation treatment. It can be seen from this that the multiple electrode elements 2100 in the ablation electrode group 2000 form multiple annular trajectory unit groups and multiple linear trajectory unit groups in the axial and circumferential directions of the deformable frame 1000. As the deformable frame 1000 is unfolded, the ablation treatment range in the blood vessel 500 can be greatly expanded, and operations such as axial movement and circumferential rotation are no longer required, so a larger range of treatment can be achieved, which can effectively improve treatment efficiency, reduce operational difficulty, and contribute to the development of ablation treatment technology.

[0081] Continue reading Figure 2 and Figure 3As shown, in one embodiment, after the multiple electrode elements 2100 in the ablation electrode group 2000 form multiple annular trajectory unit groups in the circumferential direction of the deformable frame 1000, each of the multiple annular trajectory unit groups can form a radial ablation energy circle 2100a in the radial direction of the deformable frame 1000. The radial ablation energy circle 2100a can be used to emit energy, so that the radio frequency current flows through the biological tissue, and the polarized water molecules in the biological tissue move at high speed by means of the rapid change of the electromagnetic field, resulting in endogenous heat effect, causing the water inside and outside the cells to evaporate, dry, shrink and fall off, resulting in aseptic necrosis, thereby achieving the purpose of ablation treatment.

[0082] Adjacent radial ablation energy circles 2100a formed by adjacent annular trajectory unit groups can be limited to not overlap each other. For example, in one embodiment, the multiple electrode elements 2100 in each annular trajectory unit group can be limited to be surrounded by annular trajectories along the circumference of the deformable frame 1000, and the planes of each annular trajectory formed by the arrangement of the multiple electrode elements 2100 are perpendicular to the axis of the deformable frame 1000. Therefore, by limiting the arrangement of the multiple electrode elements 2100, it is possible to achieve that the adjacent radial ablation energy circles 2100a do not overlap. This arrangement method can ensure that the range of ablation can be improved, and can prevent the occurrence of overlapping areas of excessive ablation, and avoid the phenomenon of excessive ablation at the corresponding position. Moreover, the spacing between adjacent electrode elements 2100 in each annular trajectory unit group can also be set to be arranged at an equal distance. In addition, those skilled in the art can also arrange multiple electrode elements 2100 in various trajectory forms such as square annular trajectories and elliptical annular trajectories according to actual needs to meet the arrangement between the radial ablation energy circles 2100a, which is not limited here.

[0083] Continue reading Figure 2 and Figure 3 As shown, in one embodiment, after the multiple electrode elements 2100 in the ablation electrode group 2000 form multiple linear trajectory unit groups in the axial direction of the deformable frame 1000, each of the multiple linear trajectory unit groups can also form an axial ablation energy circle 2100b in the axial direction of the deformable frame 1000. The radial ablation energy circle 2100a can also be used to emit energy, so that the radio frequency current flows through the biological tissue, and the polarized water molecules in the biological tissue move at high speed by means of the rapid change of the electromagnetic field, resulting in endogenous heat effect, causing the water inside and outside the cells to evaporate, dry, shrink and fall off, resulting in aseptic necrosis, thereby achieving the purpose of ablation treatment.

[0084] The adjacent axial ablation energy circles 2100b formed by adjacent linear trajectory unit groups can also be limited to not overlap each other. For example, in one embodiment, the multiple electrode elements 2100 in each linear trajectory unit group can be limited to be distributed in a linear trajectory along the axial direction of the deformable frame 1000, and each linear trajectory arranged by the multiple electrode elements 2100 is parallel to the axis of the deformable frame 1000. Therefore, by limiting the arrangement of the multiple electrode elements 2100, it is possible to achieve that the adjacent axial ablation energy circles 2100b do not overlap. This arrangement method can ensure that the range of ablation can be improved, and can prevent the occurrence of overlapping areas of excessive ablation, and avoid the phenomenon of excessive ablation at the corresponding position. Moreover, the spacing between the adjacent electrode elements 2100 in each linear trajectory unit group can also be set to be arranged at an equal distance. In addition, those skilled in the art can also arrange multiple electrode elements 2100 in various trajectory forms such as arc-shaped trajectories and wavy-shaped trajectories according to actual needs to meet the arrangement between the radial ablation energy circles 2100a, which is not limited here.

[0085] Of course, those skilled in the art can also make some or all of the adjacent radial ablation energy circles 2100a overlap to a certain extent during the uniform arrangement of adjacent radial ablation energy circles 2100a and adjacent axial ablation energy circles 2100b, and can also make some or all of the adjacent axial ablation energy circles 2100b overlap to a certain extent. The overlapping partial areas can form stimulation between the electrode elements 2100 and form a stimulation circuit, thereby helping the operator to find the target treatment area and improve the accuracy of ablation. This allows the ablation electrode group 2000 on the deformable frame 1000 to form an integrated stimulation and ablation function. Regarding the specific degree of overlap, technicians in this field can make appropriate adjustments based on various factors such as the desired degree of stimulation and the size of the deformable frame 1000, so that although adjacent radial ablation energy circles 2100a and adjacent axial ablation energy circles 2100b form overlapping areas, excessive ablation will not occur. A balance is sought between excessive ablation and electrode stimulation, which is not specifically limited here.

[0086] For example, in one embodiment, each annular trajectory unit group forms a radial ablation energy circle 2100a in the radial direction of the deformable frame 1000, and between adjacent radial ablation energy circles 2100a formed by adjacent annular trajectory unit groups, a limited portion of adjacent radial ablation energy circles 2100a overlap, or all adjacent radial ablation energy circles 2100a may overlap. The overlap may occur in such a way that the multiple electrode elements 2100 in each annular trajectory unit group surround the deformable frame 1000 in a circular trajectory in the circumferential direction, and at least some of the planes where the adjacent circular trajectories are located have an angle, and the adjacent circular trajectories overlap, so that the adjacent radial ablation energy circles 2100a formed by the multiple electrode elements 2100 arranged in the adjacent circular trajectories overlap. In addition, those skilled in the art may also achieve the overlap between adjacent radial ablation energy circles 2100a in other ways according to actual needs, which is not limited here.

[0087] For another example, in one of the embodiments, each linear trajectory unit group forms an axial ablation energy circle 2100b in the axial direction of the deformable frame 1000. Between adjacent axial ablation energy circles 2100b formed by adjacent linear trajectory unit groups, it is also possible to limit some adjacent axial ablation energy circles 2100b to overlap, or all adjacent axial ablation energy circles 2100b to overlap. The overlap may occur in such a way that the multiple electrode elements 2100 in each linear trajectory unit group are distributed in a linear trajectory along the axial direction of the deformable frame 1000, and at least some of the adjacent linear trajectories have an angle, and the adjacent linear trajectories form an intersection, so that the adjacent axial ablation energy circles 2100b formed by the multiple electrode elements 2100 arranged in the adjacent linear trajectories overlap. In addition, those skilled in the art may also achieve the overlap between adjacent axial ablation energy circles 2100b in other ways according to actual needs, which is not limited here.

[0088] The deformation frame 1000 can adopt various frame forms, please refer to Figure 1 As shown in one embodiment, the deformable frame 1000 includes a plurality of deformable support rods 1100 and a first bundling element 1110 and a second bundling element 1120 for connecting the plurality of deformable support rods 1100. The deformable support rods 1100 can be preformed into a specific shape, for example, the plurality of deformable support rods 1100 can be arranged to be spirally wound circumferentially along the axial direction, see Figure 1As shown. The material of the deformable stent rod 1100 can be selected from polymer or shape memory alloy materials with good morphological change and recovery capabilities. The polymer material can be selected from PEBAX, TPU and other materials, and the shape memory alloy material can be selected from nickel-titanium alloy, stainless steel or titanium and other materials. For example, the deformable stent rod 1100 can be a combination of nickel-titanium alloy and polymer tubing. The linear length of the deformable stent rod 1100 can be set between 20mm and 80mm. The first bundling element 1110 is connected to the distal ends of the multiple deformable stent rods 1100, and the second bundling element 1120 is connected to the proximal ends of the multiple deformable stent rods 1100, so that the two ends of the multiple deformable stent rods 1100 are bundled and connected to form a retractable and expandable stent structure. The multiple electrode elements 2100 of the ablation electrode group 2000 can be arranged on multiple deformable support rods 1100, so that the multiple electrode elements 2100 can be constructed into multiple annular trajectory unit groups and multiple linear trajectory unit groups in the axial direction and the circumferential direction respectively, which will not be elaborated here.

[0089] In order to effectively reduce the temperature between the ablation electrode group 2000 and the inner wall of the blood vessel 500, thereby further increasing the ablation depth, in one embodiment, the electrode element 2100 may be provided with a medium perfusion hole 2100c, so that the medium perfusion hole 2100c can be used to transport a cooling medium. If deep ablation is not achieved, it is difficult to achieve an ideal ablation effect at the deep ablation position, but deep ablation may have the risk of damaging healthy tissues, so it is necessary to specifically reduce the temperature at the ablation position to ensure that the inner wall of the blood vessel 500 is not damaged, increase the ablation depth, and achieve a good treatment effect.

[0090] The cooling medium can be a saline solution or the like. One or more medium perfusion holes 2100c are opened on the electrode element 2100 as needed. The operator can connect to the medium perfusion hole 2100c on the electrode element 2100 through the delivery tube 400. For example, one end of the delivery tube 400 is located outside the body, and the other end of the delivery tube 400 is connected to the medium perfusion hole 2100c on the electrode element 2100 by direct or indirect connection. The operator transports the cooling medium into the delivery tube 400 outside the body, transports the cooling medium to the medium perfusion hole 2100c of the electrode element 2100 through the delivery tube 400, and applies the cooling medium to the target position through the medium perfusion hole 2100c to reduce the temperature at the ablation position.

[0091] After the delivery tube 400 is connected to the medium perfusion hole 2100c in the electrode element 2100, a channel from outside to inside can be formed. The channel may only include the delivery tube 400 and the medium perfusion hole 2100c, or may include other channels or holes opened on the deformable frame 1000 for conveying cooling medium. This needs to be determined according to the arrangement of the electrode element 2100 on the deformable frame 1000, and is not limited here. For example, in one embodiment, a wire delivery channel can be opened in the deformable support rod 1100 along the length direction of the rod body. The wire delivery channel is used to pass the energy delivery wire, and the energy delivery wire is used to connect the electrode element 2100 to deliver energy from outside the organism to inside the organism, as a structure for energy transmission. In addition, a first medium delivery channel can be opened in the deformable support rod 1100 along the length direction of the rod body. The first medium delivery channel is used to transport cooling medium. At this time, the delivery tube 400 can be connected with the first medium delivery channel, and the first medium delivery channel is connected with the medium perfusion hole 2100c on the electrode element 2100, so that the delivery tube 400, the first medium delivery channel and the medium perfusion hole 2100c in the electrode element 2100 are connected together to form a channel from outside to inside, so as to transport cooling medium from outside the biological body to the inside.

[0092] See also Figures 4 to 6 As shown, the first clustering element 1110 includes a first clustering end 1110a and a plurality of first clustering stent rods 1110b. The first clustering end 1110a is clustered and connected with the distal ends of the plurality of first clustering stent rods 1110b. The number of the first clustering stent rods 1110b is the same as the number of the deformable stent rods 1100. The proximal end of each first clustering stent rod 1110b is connected with the distal end of a deformable stent rod 1100. The distal end of the first clustering end 1110a may have a smooth chamfer, and the material thereof may be selected to have certain imaging properties and good biocompatibility, such as gold or platinum-iridium alloy. The proximal end of the first clustering stent rod 1110b may also have a smooth chamfer, so that the inner wall of the blood vessel 500 will not be damaged during the process of being attached to the inner wall of the blood vessel 500. The first clustering end 1110a and the plurality of first clustering stent rods 1110b may be formed in one piece, or may be manufactured separately and subsequently assembled.

[0093] The first clustering support rod 1110b can be preformed into a specific shape, for example, a claw-shaped structure extending uniformly in the radial direction. The outer contour diameter formed by the multiple first clustering support rods 1110b in the first clustering element 1110 gradually increases in the direction from the distal end to the proximal end of the first clustering element 1110, so that the first clustering element 1110 can form an outer contour shape similar to an umbrella shape, which is convenient for forming a connection with a deformable support that can be deformed at any time. The outer diameter size of the first clustering support rod 1110b and the deformable support rod 1100 can be set to be the same, or the outer diameter size of the first clustering support rod 1110b can be slightly larger than the outer diameter size of the deformable support rod 1100, as long as the two have good connectivity.

[0094] See also Figures 7 to 9 As shown, the second clustering element 1120 includes a second clustering end 1120a and a plurality of second clustering stent rods 1120b, the second clustering end 1120a is connected to the proximal ends of the plurality of second clustering stent rods 1120b, the number of the second clustering stent rods 1120b is the same as the number of the deformable stent rods 1100, and the distal end of each second clustering stent rod 1120b is connected to the proximal end of a deformable stent rod 1100. The distal end of the second clustering end 1120a may have a smooth chamfer, and its material may be selected to have certain imaging properties and good biocompatibility, such as gold or platinum-iridium alloy. The proximal end of the second clustering stent rod 1120b may also have a smooth chamfer, so that it will not damage the inner wall of the blood vessel 500 during the process of contacting with the inner wall of the blood vessel 500. The second clustering end 1120a and the plurality of second clustering stent rods 1120b can be formed in one piece, or can be manufactured separately and assembled later.

[0095] The second clustering support rod 1120b can be preformed into a specific shape, for example, a claw-shaped structure extending uniformly in the radial direction. The outer contour diameter formed by the multiple second clustering support rods 1120b in the second clustering element 1120 gradually increases in the direction from the proximal end to the distal end of the second clustering element 1120, so that the second clustering element 1120 can form an outer contour shape similar to an umbrella shape, which is convenient for forming a connection with a deformable support that can be deformed at any time. The outer diameter size of the second clustering support rod 1120b and the deformable support rod 1100 can be set to be the same, or the outer diameter size of the second clustering support rod 1120b can be slightly larger than the outer diameter size of the deformable support rod 1100, as long as the two have good connectivity.

[0096] The number of the first cluster support rod 1110b and the second cluster support rod 1120b can be set to be 4 to 24, which can be determined according to actual conditions. The material of the first cluster support rod 1110b and the second cluster support rod 1120b can be selected from polymer or shape memory alloy materials with good morphological change and recovery capabilities. The polymer material can be selected from materials such as PEBAX and TPU, and the shape memory alloy material can be selected from materials such as nickel-titanium alloy, stainless steel or titanium.

[0097] At least one of the first clustering end 1110a and the second clustering end 1120a is provided with a central through hole 1120a1, and the interior of the central through hole 1120a1 may be coated with a hydrophilic and lubricating coating to reduce the movement resistance of the inner core rod 200, and the hydrophilic and lubricating coating may preferably be PTFE or PFA. In particular, when the inner core rod 200 penetrates from the central axis of the deformable support, the second clustering end 1120a must be provided with a central through hole 1120a1, so that the inner core rod 200 can pass through the central through hole 1120a1 of the second clustering end 1120a, and pass through the interior of the deformable support to form a connection with the first clustering end 1110a. The first clustering end 1110a may also be provided with a central through hole 1120a1 to facilitate the plug-in connection between the distal end of the inner core rod 200 and the first clustering end 1110a, and may be further fixed by welding or glue bonding. At least one of the first cluster support rod 1110b and the second cluster support rod 1120b may be selectively adopted as an elastic rod having an elastic effect.

[0098] Continue reading Figure 8 and Fig. 9 As shown, in one embodiment, a second medium delivery channel 1120b1 may also be opened in the second cluster support rod 1120b, and the second medium delivery channel 1120b1 is used to deliver cooling medium. At this time, the delivery pipe 400 can be connected with the second medium delivery channel 1120b1, and the second medium delivery channel 1120b1 is connected with the first medium delivery channel, and then the first medium delivery channel is connected with the medium perfusion hole 2100c on the electrode element 2100, so that the delivery pipe 400, the second medium delivery channel 1120b1, the first medium delivery channel and the medium perfusion hole 2100c in the electrode element 2100 are connected together to form a channel from outside to inside, and the cooling medium is delivered from outside to inside of the organism. Fig.10 As shown, the cooling medium outside the body, such as saline, can first enter from the delivery tube 400, flow along the second medium delivery channel 1120b1, enter the first medium delivery channel, and finally be ejected through the medium injection hole 2100c on the electrode element 2100. The flow direction of the cooling medium is Fig.10 The flow direction is shown as ①→②→③→④.

[0099] Continue reading Fig.11 and Fig.12 As shown, in one embodiment, the deformable frame 1000 may further include a delivery support rod 1200, and a medium perfusion channel 1200a is opened in the delivery support rod 1200, and the cooling medium is transported by the medium perfusion channel 1200a, instead of using the electrode element 2100 to perfuse the cooling medium. The number of medium perfusion channels 1200a and the number of channel outlets of each medium perfusion channel 1200a can be set according to demand, for example, the number of channel outlets can be set to be the same as the number of electrode elements 2100, so that each channel outlet corresponds to an electrode element 2100, ensuring that the ablation position of each electrode element 2100 can be cooled in a targeted manner.

[0100] See also Fig.13 As shown, at this time, the delivery tube 400 can be directly connected to the medium perfusion channel 1200a in the delivery support rod 1200, and there is no need to open the first medium delivery channel, the second medium delivery channel 1120b1 and the medium perfusion hole 2100c in the electrode element 2100. Among them, the electrode element 2100 is only used for the release of radio frequency energy, and there is no need to set the medium perfusion hole 2100c, so the component processing technology can be simplified. The deformable support rod 1100 can also be set as a simple single-cavity structure, that is, only a wire delivery channel for passing the energy delivery wire is required, which can effectively reduce the difficulty of manufacturing the component. The cooling medium outside the body, such as saline, can first enter from the delivery tube 400, flow along the medium perfusion channel 1200a, and finally be ejected through the channel outlet of the medium perfusion channel 1200a to apply the cooling medium to the corresponding position of the electrode element 2100. The flow direction of the cooling medium is Fig.13 The flow direction is shown as ①→②→③→④.

[0101] Continue reading Fig.11 and Fig.12 As shown, the number of delivery stent rods 1200 can be set according to demand, for example, the number of delivery stent rods 1200 can be the same as the number of deformable stent rods 1100. Moreover, multiple delivery stent rods 1200 can also be spirally wound circumferentially along the axial direction, so that the delivery stent rods 1200 and the deformable stent rods 1100 maintain the same spiral winding shape, constructing a deformable frame 1000 that can shrink and expand. Among them, each delivery stent rod 1200 can correspond to a deformable stent rod 1100, and the number of channel outlets on each delivery stent rod 1200 is the same as and corresponds to the number of electrode elements 2100 on the corresponding deformable stent rod 1100. The delivery stent rod 1200 can be constructed inside the deformable stent rod 1100, for example Fig.11 and Fig.12As shown, when the deformable stent body 1000 is in the expanded state, the maximum expanded outer diameter D1 of the multiple delivery stent rods 1200 spirally wound circumferentially is smaller than the maximum expanded outer diameter D of the multiple deformable stent rods 1100 spirally wound circumferentially.

[0102] The electrode element 2100 in the ablation electrode group 2000 can be selected from a variety of structures and shapes, as long as it can be stably installed and arranged on the deformable frame 1000. For example, in one embodiment, the electrode element 2100 can be selected as a sleeve-shaped element, and the sleeve-shaped element has a sleeve cavity passing through both ends, so that the electrode element 2100 can be adapted to the deformable frame 1000 composed of the deformable support rod 1100, and can be sleeved on the deformable support rod 1100 using the sleeve cavity. In addition, refer to Fig.14 and Fig.15 As shown, the electrode element 2100 may include at least two unit electrodes 2100d, at least one unit electrode 2100d of all the unit electrodes 2100d is a radio frequency signal receiving electrode, and the remaining unit electrodes 2100d are radio frequency signal transmitting electrodes, so that the electrode element 2100 formed can help find the target treatment area through mutual stimulation between the radio frequency signal receiving electrode and the radio frequency signal transmitting electrode, thereby forming a stimulation and ablation integration. The spacing between the radio frequency signal receiving electrode and the radio frequency signal transmitting electrode can be limited to between 0.5mm and 1mm.

[0103] When the target treatment area is determined, the RF signal receiving electrode and the RF signal transmitting electrode in the electrode element 2100 can be ablated simultaneously or partially, thereby completing the treatment of the target treatment area. With the cooperation of the RF signal receiving electrode and the RF signal transmitting electrode, the operator can stimulate the target treatment area first and then ablate it. When the RF ablation catheter enters the blood vessel 500, the ablation component 300 can be adjusted to a state of close contact with the inner wall of the blood vessel 500, and the target treatment area can be stimulated first, so as to find a suitable treatment area and improve the accuracy of ablation.

[0104] Continue reading Figure 1 and Figure 2As shown, the present application provides a radiofrequency ablation catheter, which includes an outer sheath 100, an inner core rod 200 and an ablation assembly 300. In addition, the radiofrequency ablation catheter may also include other matching components such as a handle, an infusion system and an energy delivery system (not shown in the figure). The outer sheath 100 can be made of a mixed material of polymer and metal with a braided structure, and the outer sheath 100 has a certain anti-kinking performance and a certain hardness. The handle can be provided with an adjustment button (not shown in the figure), and the adjustment button is used to control the axial movement of the inner core rod 200, thereby adjusting the length of the axial stretch and compression of the ablation assembly 300, so as to control the outline size of the ablation assembly 300, and the real-time switching of the ablation assembly 300 between the expanded state and the contracted state, which is helpful for movement and abutment treatment in the blood vessel 500.

[0105] The outer sheath tube 100 has an axially through-going inner cavity, the inner core rod 200 is movably assembled in the inner cavity of the outer sheath tube 100, the ablation assembly 300 is arranged at the distal end of the outer sheath tube 100, and the proximal end of the outer sheath tube 100 can be connected to a handle for holding. The inner core rod 200 is connected to the deformable frame 1000 of the ablation assembly 300, for example, the distal end of the inner core rod 200 is connected to the distal end of the ablation assembly 300, the proximal end of the inner core rod 200 penetrates the interior of the ablation assembly 300, and is connected to the outer sheath tube 100 to the adjustment button arranged in the handle, by controlling the adjustment button, the inner core rod 200 is axially moved, and then a force is applied to the deformable frame 1000, and the deformable frame 1000 is controlled to switch between the contracted state and the expanded state. The inner core rod 200 can be selected from a metal material with a certain hardness and good biocompatibility, such as a nickel-titanium alloy or a stainless steel material with good biocompatibility. The outside of the inner core rod 200 may be coated with a hydrophilic and lubricating coating to reduce the movement resistance of the inner core rod 200 . The hydrophilic and lubricating coating may preferably be PTFE or PFA.

[0106] Continue reading Figure 3 As shown in FIG. 1 , when the ablation assembly 300 of the radiofrequency ablation catheter is in the expanded state, the multiple electrode elements 2100 in the ablation electrode group 2000 are evenly distributed in the axial and circumferential directions, and the multiple electrode elements 2100 have a suitable distribution spacing between each other. The input energy can make the multiple electrode elements 2100 work, such as Figure 3As shown in , the ablation electrode group 2000 will simultaneously form four axial ablation energy circles 2100b and four radial ablation energy circles 2100a in the radial and axial directions. The four axial ablation energy circles 2100b and the four radial ablation energy circles 2100a do not overlap each other, so that when the ablation assembly 300 is at the maximum expanded outer diameter, the ablation electrode group 2000 has a suitable energy release spacing in the axial and radial directions, and the released radio frequency energy will not overlap excessively, thereby avoiding damage to the inner wall of the blood vessel 500. This structure enables the radio frequency ablation catheter to effectively improve the energy distribution, cover a wider treatment area, facilitate the operator's operation, and reduce the difficulty of surgical treatment.

[0107] In some other embodiments, part or all of the axial ablation energy circle 2100b and the radial ablation energy circle 2100a may also have a certain degree of mutual overlap, and mutual stimulation is formed by means of the electrode elements 2100 that are relatively close, which is more conducive to finding the target treatment. In this embodiment, the electrode elements 2100 that are relatively close may also choose not to work at the same time, so as to avoid excessive energy overlap and avoid damage to the inner wall of the blood vessel 500.

[0108] See also Fig.16 and Fig.17 As shown, during the operation, when the radiofrequency ablation catheter needs to enter the blood vessel 500 or when the radiofrequency ablation catheter needs to change the treatment area, the shape of the ablation component 300 can be adjusted from the expanded state to the contracted state. At this time, the ablation component 300 of the radiofrequency ablation catheter can be in a near-linear state, which helps the radiofrequency ablation catheter enter the blood vessel 500 or move and adjust in the blood vessel 500. When reaching the target treatment area, the ablation component 300 is gradually adjusted to the expanded state so that the ablation component 300 and the blood vessel 500 are in good contact. At this time, the perfusion system or energy system can be turned on to start ablation treatment of the target treatment area.

[0109] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0110] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An ablation assembly, characterized in that: The ablation assembly comprises: A deformable frame, wherein the deformable frame has a contracted state and an expanded state; An ablation electrode group, the ablation electrode group comprises a plurality of electrode elements distributed on the surface of the deformable frame, and in the expanded state of the deformable frame, the plurality of electrode elements can be respectively constructed into a plurality of annular trajectory unit groups and a plurality of linear trajectory unit groups in the axial direction and the circumferential direction of the deformable frame, wherein the annular trajectory unit group surrounds the circumference of the deformable frame, and the linear trajectory unit group is linearly distributed along the axial direction of the deformable frame.

2. The ablation assembly according to claim 1, characterized in that: Each of the annular trajectory unit groups forms a radial ablation energy circle in the radial direction of the deformable frame, and adjacent radial ablation energy circles formed by adjacent annular trajectory unit groups do not overlap; and / or, Each of the linear track unit groups forms an axial ablation energy circle in the axial direction of the deformable frame, and adjacent axial ablation energy circles formed by adjacent linear track unit groups do not overlap.

3. The ablation assembly according to claim 2, characterized in that: The plurality of electrode elements in each annular track unit group surround the deformable frame in an annular track along the circumference of the deformable frame, and the plane where the annular track is located is perpendicular to the axis of the deformable frame; and / or, The spacing between adjacent electrode elements in each annular track unit group is the same; and / or, The plurality of electrode elements in each linear track unit group are distributed along the axial direction of the deformable frame in a linear track, and the linear track is parallel to the axis of the deformable frame; and / or, The spacing between adjacent electrode elements in each linear track unit group is the same.

4. The ablation assembly according to claim 1, characterized in that: Each of the annular trajectory unit groups forms a radial ablation energy circle in the radial direction of the deformable frame, and between adjacent radial ablation energy circles formed by adjacent annular trajectory unit groups, at least some of the adjacent radial ablation energy circles overlap; and / or, Each of the linear track unit groups forms an axial ablation energy circle in the axial direction of the deformable frame, and between adjacent axial ablation energy circles formed by adjacent linear track unit groups, at least some of the adjacent axial ablation energy circles overlap.

5. The ablation assembly according to claim 4, characterized in that: The plurality of electrode elements in each annular track unit group are arranged in an annular track along the circumference of the deformable frame, and at least some of the planes where adjacent annular tracks are located have an angle; and / or, The plurality of electrode elements in each linear track unit group are distributed in a linear track along the axial direction of the deformable frame, and at least some of the adjacent linear tracks have an angle between them.

6. The ablation assembly according to claim 1, characterized in that: The electrode element is provided with a medium filling hole, and the medium filling hole is used for conveying a cooling medium.

7. The ablation assembly according to any one of claims 1 to 6, characterized in that: The deformation frame comprises: A plurality of deformable support rods, each of which is spirally wound circumferentially along the axial direction, and a plurality of electrode elements of the ablation electrode group are arranged on the plurality of deformable support rods, so that the plurality of electrode elements can be respectively constructed into a plurality of annular track unit groups and a plurality of linear track unit groups in the axial direction and the circumferential direction; A first bundling element, the first bundling element is connected to the distal ends of the plurality of deformable stent rods; A second bundling element is connected to the proximal ends of the plurality of deformable stent rods.

8. The ablation assembly according to claim 7, characterized in that: At least one of a wire delivery channel and a first medium delivery channel is provided in the deformable support rod, wherein the wire delivery channel is used to pass an energy delivery wire, the energy delivery wire is used to connect the electrode element, and the first medium delivery channel is used to deliver a cooling medium; and / or, The first clustering element comprises a first clustering end and a plurality of first clustering support rods, the first clustering end is connected to the distal ends of the plurality of first clustering support rods, the number of the first clustering support rods is the same as the number of the deformable support rods, and the proximal end of each of the first clustering support rods is connected to the distal end of one of the deformable support rods; and / or, The second bundling element includes a second bundling end and a plurality of second bundling support rods. The second bundling end is connected to the proximal ends of the plurality of second bundling support rods. The number of the second bundling support rods is the same as the number of the deformable support rods. The distal end of each second bundling support rod is connected to the proximal end of a deformable support rod.

9. The ablation assembly according to claim 8, characterized in that: A second medium delivery channel is provided in the second cluster support rod, and the second medium delivery channel is used to deliver cooling medium; and / or, At least one of the first clustering end and the second clustering end is provided with a central through hole, and the central through hole is used for passing an inner core rod; and / or, At least one of the first cluster support rod and the second cluster support rod is an elastic rod; and / or, The outer contour diameter formed by the plurality of the first clustering support rods in the first clustering element gradually increases in the direction from the distal end to the proximal end of the first clustering element; and / or, The outer contour diameter formed by the plurality of second clustering support rods in the second clustering element gradually increases in the direction from the proximal end to the distal end of the second clustering element.

10. The ablation assembly according to claim 7, characterized in that: The deformation frame comprises: A delivery support rod is provided with a medium perfusion channel in the delivery support rod, and the medium perfusion channel is used to deliver cooling medium.

11. The ablation assembly according to claim 10, characterized in that: The number of the channel outlets of the medium perfusion channel is the same as the number of the electrode elements, and each of the channel outlets corresponds to one of the electrode elements; or, The number of the conveying support rods is the same as the number of the deformable support rods, and the multiple conveying support rods are all spirally wound circumferentially along the axial direction. Each of the conveying support rods corresponds to a deformable support rod, and the number of channel outlets on each conveying support rod is the same as and corresponds to the number of electrode elements on the corresponding deformable support rod.

12. The ablation assembly according to claim 7, characterized in that: The electrode element is a sleeve-shaped element, the sleeve-shaped element has a sleeve cavity with two ends passing through, and the electrode element is sleeved on the deformable support rod; and / or, The electrode element includes at least two unit electrodes, at least one of the unit electrodes is a radio frequency signal receiving electrode, and the remaining unit electrodes are radio frequency signal transmitting electrodes.

13. A radiofrequency ablation catheter, characterized in that: The radiofrequency ablation catheter comprises: An outer sheath tube, wherein the outer sheath tube has an axially penetrating inner cavity; An inner core rod, the inner core rod being movably assembled in the inner cavity of the outer sheath tube; The ablation component as described in any one of claims 1-12, wherein the ablation component is arranged at the distal end of the outer sheath tube, and the inner core rod is connected to the deformable frame of the ablation component to control the mutual conversion of the deformable frame between the contracted state and the expanded state.

Images