Ablation catheter

Abstract

The invention relates to an ablation catheter which comprises a head end electrode, a plurality of electrode arms and a catheter body, each electrode arm is provided with at least one electrode, and when the head end electrode is used for being attached to target ablation tissue, the polarity of the head end electrode is configured to be opposite to the polarity of the electrodes on the at least one electrode arm so as to transmit ablation energy to the target ablation tissue for ablation. In the application, for the target ablation tissue of which the electrode arms are inconvenient to attach, the head end electrode can be well attached to the target ablation tissue, and the polarity of the head end electrode is configured to be opposite to the polarity of the electrode on at least one electrode arm; according to the ablation electrode, an output loop can be formed between the electrode on at least one electrode arm and the head end electrode, so that the head end electrode can form a high-intensity electric field in a target ablation tissue, the ablation width and the ablation depth can be remarkably increased, and the ablation efficiency and the ablation effect can be effectively improved.

Description

Technical Field

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

[0002] Tissue ablation is commonly used to treat various arrhythmias, including atrial fibrillation. During atrial fibrillation treatment surgery, the surgeon will determine the ablation site based on the origin of atrial fibrillation. The origin of paroxysmal atrial fibrillation is believed to be mainly related to the pulmonary vein cuffs. Therefore, the main treatment for paroxysmal atrial fibrillation is pulmonary vein isolation. However, when atrial flutter occurs during ablation, linear ablation is required at the top of the left atrium or the isthmus of the mitral valve.

[0003] The basket-shaped ablation catheter in the prior art achieves one-time ablation of the pulmonary veins with the aid of a guidewire. However, for areas that are difficult for the electrode arm to reach, such as the top of the left atrium and the isthmus of the mitral valve, it is difficult for the electrode arm of the basket-shaped ablation catheter to form a good fit with the target ablation tissue, resulting in a small ablation width and ablation depth, leading to low ablation efficiency and poor ablation effect. Summary of the invention

[0004] The purpose of the present application is to provide an ablation catheter. The ablation catheter provided by the present application can form a good contact with the target ablation tissue through the head end electrode, and by configuring the polarity of the head end electrode to be opposite to the polarity of the electrode on at least one electrode arm, the ablation width and ablation depth can be significantly increased, and the ablation efficiency and ablation effect can be effectively improved.

[0005] The technical solutions provided by this application are as follows: An ablation catheter comprises: a head end electrode, a plurality of electrode arms and a tube body; The head end electrode is arranged at the distal end of each electrode arm, and the proximal end of each electrode arm is connected to the distal end of the tube body; Each of the electrode arms is provided with at least one electrode; The head end electrode is configured to have a polarity opposite to the polarity of the electrode on at least one of the electrode arms when it is in contact with the target ablation tissue, so as to transmit ablation energy to the target ablation tissue for ablation.

[0006] Optionally, the head end electrode is specifically used to be configured with a polarity opposite to the polarity of the electrodes on the two or more electrode arms when it is in contact with the target ablation tissue, so as to transmit ablation energy to the target ablation tissue for ablation.

[0007] Optionally, it further comprises: a bracket, the bracket comprising a bracket connecting portion and a plurality of bracket arms having the same number as the electrode arms; Each of the support arms is inserted into each of the electrode arms; The distal end of each electrode arm is connected to the distal end of each support arm and the proximal end of the support connecting portion; The distal end of the bracket connecting portion abuts against the proximal end of the head end electrode.

[0008] Optionally, the support connecting portion and each of the support arms are made of insulating material, or the outer surfaces of the support connecting portion and each of the support arms are provided with an insulating coating.

[0009] Optionally, it further comprises: an insulating ring; The insulating ring is arranged between the distal end of the support connecting part and the proximal end of the head end electrode, and the insulating ring is used to insulate and isolate the distal end of the support connecting part and the proximal end of the head end electrode.

[0010] Optionally, it also includes: an inner tube; The inner tube is coaxially movably arranged in the tube body; The inner wall of the distal end of the inner tube is fixedly connected to the outer wall of the proximal end of the head end electrode; The outer wall of the distal end of the inner tube is fixedly connected to the inner wall of the bracket connecting part.

[0011] Optionally, the head end electrode includes a head end electrode abutting portion and a head end electrode connecting portion; The distal end of the head end electrode abutment portion is used to abut against the target ablation tissue; The proximal end of the head end electrode abutment portion is fixedly connected to the distal end of the head end electrode connection portion, the proximal end of the head end electrode abutment portion abuts against the distal end of the inner tube and the distal end of the bracket connection portion, or the proximal end of the head end electrode abutment portion abuts against the distal end of the inner tube and the distal end of the insulating ring; The inner wall of the distal end of the inner tube is fixedly connected to the outer wall of the head end electrode connecting portion.

[0012] Optionally, the outer surface of the distal end of the head end electrode abutment portion is semicircular, semi-elliptical or arc-shaped.

[0013] Optionally, each of the electrode arms is provided with a plurality of electrodes; A plurality of electrodes are arranged along the length direction of the electrode arm; The positions of the plurality of electrodes on each of the electrode arms are respectively the same.

[0014] Compared with the prior art, the present application provides an ablation catheter, comprising: a head end electrode, a plurality of electrode arms and a tube body, wherein the head end electrode is arranged at the distal end of each electrode arm, the proximal end of each electrode arm is connected to the distal end of the tube body, and each electrode arm is provided with at least one electrode, and the head end electrode is used to abut against the target ablation tissue, and the polarity is configured to be opposite to the polarity of the electrode on at least one electrode arm, so as to transmit ablation energy to the target ablation tissue for ablation. In the present application, for the target ablation tissue that is not convenient for the electrode arm to abut against, the head end electrode can form a good ablation with the target ablation tissue, and by configuring the polarity of the head end electrode to be opposite to the polarity of the electrode on at least one electrode arm, an output loop can be formed between the electrode on at least one electrode arm and the head end electrode, so that the head end electrode can form a higher intensity electric field inside the target ablation tissue, thereby significantly increasing the ablation width and ablation depth, and effectively improving the ablation efficiency and the ablation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a first front view structural schematic diagram of an ablation catheter disclosed in an embodiment of the present application; Figure 2 A schematic diagram of a top view of an ablation catheter disclosed in an embodiment of the present application; Figure 3 An equivalent circuit diagram of a catheter-target ablation tissue formed in a polarity configuration mode of a head end electrode and an electrode on an electrode arm disclosed in an embodiment of the present application; Figure 4 An equivalent circuit diagram of a catheter-target ablation tissue formed in a polarity configuration mode of the tip electrode and the electrodes on the two electrode arms disclosed in an embodiment of the present application; Figure 5 A schematic diagram of the damage range of the target ablation tissue in the polarity configuration mode of the head electrode and the electrode on an electrode arm calculated by finite element simulation at a voltage of 1800V disclosed in the embodiment of the present application; Figure 6 A schematic diagram of the damage range of the target ablation tissue in the polarity configuration mode of the head electrode and the electrodes on the two electrode arms calculated by finite element simulation at a voltage of 1800V disclosed in the embodiment of the present application; Figure 7A comparison diagram of ablation depths of target ablated tissues in a polarity configuration mode of a head-end electrode with electrodes on one electrode arm and a polarity configuration mode of a head-end electrode with electrodes on two electrode arms calculated by finite element simulation at different voltages disclosed in an embodiment of the present application; Figure 8 The ablation depth trend diagram of the target ablation tissue corresponding to the head electrode with different numbers of electrode arms calculated by finite element simulation at 1800V voltage disclosed in the embodiment of the present application; Fig. 9 It is a second front view structural schematic diagram of an ablation catheter disclosed in an embodiment of the present application; Fig.10 A schematic diagram of the support structure disclosed in the embodiment of the present application; Fig.11 A schematic diagram of the connection relationship between the head end electrode, the insulating ring, and the inner tube disclosed in the embodiment of the present application; Fig.12 A schematic diagram of the structure of the head end electrode disclosed in the embodiment of the present application; Reference numerals: 100 - head end electrode; 200 - electrode arm; 300 - tube body; 400 - bracket; 500 - insulating ring; 600 - inner tube; 110-head end electrode abutment portion; 120-head end electrode connection portion; 210 - electrode; 410 - bracket connection portion; 420 - bracket arm. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0018] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0019] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do 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 should not be understood as a limitation on the present application.

[0020] In addition, the terms "first" and "second" 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 one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0021] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0022] like Figure 1 and Figure 2 As shown, this embodiment provides an ablation catheter, including: a head end electrode 100, a plurality of electrode arms 200 and a tube body 300; the head end electrode 100 is arranged at the distal end of each electrode arm 200, and the proximal end of each electrode arm 200 is connected to the distal end of the tube body 300; at least one electrode 210 is arranged on each electrode arm 200; the head end electrode 100 is used to be configured with a polarity opposite to the polarity of the electrode 210 on at least one electrode arm 200 when it is in contact with the target ablation tissue, so as to transmit ablation energy to the target ablation tissue for ablation.

[0023] In this embodiment, the outer surface of the distal end of the head end electrode 100 can be a smooth curved surface, specifically a semicircular or semi-elliptical shape. The head end electrode 100 can be made of a platinum-iridium alloy material, the electrode 210 can be made of a platinum-iridium alloy material, or can be made of other metal materials with good conductivity. The other parts of the electrode arm 200 except the electrode 210 can be made of an insulating material, preferably a plastic insulating material. The number of electrode arms 200 can be two to ten, and multiple electrode arms 200 can be arranged at intervals in the circumferential direction. The target elimination The ablated tissue may be tissue such as the top of the left atrium, the isthmus of the mitral valve, or other tissue in the myocardium. Each electrode arm 200 may be provided with one electrode 210, or may be provided with a plurality of electrodes 210. Each electrode arm 200 and the tube body 300 may be a hollow structure. The electrode 210 on the electrode arm 200 may be a ring-shaped structure. The tube body 300 and each electrode arm 200 are provided with wires connected one by one with the electrodes 210 on the electrode arm 200 for receiving pulse signals. The tube body 300 is also provided with a wire connected with the head end electrode 100 for receiving pulse signals. The proximal end of the tube body 300 can be connected to a handle, and the proximal end of the tube body 300 is connected to the distal end of the handle. When it is necessary to ablate the target ablation tissue that is not convenient for the electrode arm 200 to abut, the head end electrode 100 can be abutted against the target ablation tissue. Specifically, it can be determined whether the head end electrode 100 and the target ablation tissue are in good contact based on the detected impedance value of the head end electrode 100. After determining that the head end electrode 100 and the target ablation tissue are in good contact, the polarity configuration mode can be set on the pulse ablation instrument connected to the proximal end of the handle to make the ablation tissue close to the target ablation tissue. The polarity of the head end electrode 100 is configured to transmit the ablation energy output by the pulse ablation device to the target ablation tissue in a mode opposite to the polarity of the electrode 210 on at least one electrode arm 200 for ablation. During the process of the pulse ablation device outputting ablation energy, an output loop can be formed between the electrode 210 on at least one electrode arm 200 and the head end electrode 100, so that the head end electrode 100 can form a high-intensity electric field inside the target ablation tissue, thereby significantly increasing the ablation width and ablation depth, and effectively improving the ablation efficiency and ablation effect. In this embodiment, the handle and the pulse ablation device are not shown in the drawings.

[0024] Compared with the prior art, the present application provides an ablation catheter, comprising: a head end electrode 100, a plurality of electrode arms 200 and a tube body 300, wherein the head end electrode 100 is arranged at the distal end of each electrode arm 200, the proximal end of each electrode arm 200 is connected to the distal end of the tube body 300, and each electrode arm 200 is provided with at least one electrode 210, and the head end electrode 100 is used to be arranged with a polarity opposite to the polarity of the electrode 210 on at least one electrode arm 200 when it is in contact with the target ablation tissue, so as to transmit ablation energy to the target ablation tissue for ablation. In the present application, for The target ablation tissue that is not easy for the electrode arm 200 to be in close contact with can be well contacted with the target ablation tissue through the head end electrode 100, and by configuring the polarity of the head end electrode 100 to be opposite to the polarity of the electrode 210 on at least one electrode arm 200, an output loop can be formed between the electrode 210 on at least one electrode arm 200 and the head end electrode 100, so that the head end electrode 100 can form a higher intensity electric field inside the target ablation tissue, thereby significantly increasing the ablation width and ablation depth, and effectively improving the ablation efficiency and enhancing the ablation effect.

[0025] As an implementation mode, in the embodiment of the present application, the head end electrode 100 is specifically used to be configured with a polarity opposite to the polarity of the electrodes 210 on two or more electrode arms 200 when in contact with the target ablation tissue, so as to transmit ablation energy to the target ablation tissue for ablation.

[0026] In this embodiment, after determining that the head end electrode 100 is in good contact with the target ablation tissue, a polarity configuration mode is set on the pulse ablation device connected to the proximal end of the handle so that the polarity of the head end electrode 100 is configured to be opposite to the polarity of the electrodes 210 on two or more electrode arms 200 to transmit the ablation energy output by the pulse ablation device to the target ablation tissue for ablation. In the process of the pulse ablation device outputting ablation energy, an output loop can be formed between the electrodes 210 on the two or more electrode arms 200 and the head end electrode 100, so that the head end electrode 100 can form a higher intensity electric field inside the target ablation tissue, thereby further increasing the ablation width and ablation depth, and further improving the ablation efficiency and the ablation effect.

[0027] Specifically, when the tip electrode is matched with the polarity configuration mode of the electrode on an electrode arm, the equivalent circuit diagram formed by the catheter-target ablation tissue is as follows: Figure 3 As shown, Figure 3 In is the equivalent resistance of the electrode on one electrode arm, is the equivalent resistance of the path between the electrode on an electrode arm and the head end electrode, is the equivalent resistance of the head-end electrode. The polarity of the head-end electrode can be configured as a cathode, and the polarity of an electrode on an electrode arm can be configured as an anode. When the head-end electrode is matched with the polarity configuration mode of the electrodes on the two electrode arms, the equivalent circuit diagram formed by the catheter-target ablation tissue is as follows: Figure 4 As shown, is the equivalent resistance of the electrode on one electrode arm, is the equivalent resistance of the path between the electrode on an electrode arm and the head end electrode, is the equivalent resistance of the electrode on the other electrode arm, is the equivalent resistance of the path between the electrode on the other electrode arm and the head end electrode, is the equivalent resistance of the head-end electrode. The polarity of the head-end electrode can be configured as the cathode, and the polarity of each electrode on the two electrode arms can be configured as the anode. It can be noted that the equivalent resistance of the electrodes on the two electrode arms of the head-end electrode with the polarity configuration mode of the electrodes on the two electrode arms is in parallel in the entire discharge circuit, that is, and In the parallel state, the equivalent resistance of the head-end electrode in the polarity configuration mode of the head-end electrode with the electrodes on two electrode arms is compared with the polarity configuration mode of the head-end electrode with the electrodes on one electrode arm. The voltage drop in the discharge circuit is higher. A higher partial pressure is equivalent to a higher electric field strength, such as Figure 5 As shown in FIG. 1 , under the polarity configuration mode of the head electrode and the electrode on an electrode arm calculated by finite element simulation at a voltage of 1800 V, the damage width of the target ablation tissue is only 12.0 mm, and the damage depth is only 4.7 mm. Figure 6 As shown in FIG. 1 , the lesion width of the target ablation tissue under the polarity configuration mode of the head electrode and the electrodes on the two electrode arms calculated by finite element simulation at a voltage of 1800 V is 13.8 mm, and the lesion depth is 5.8 mm. Figure 7 As shown, under different voltages, compared with the polarity configuration mode of the head-end electrode with the electrodes on one electrode arm, the ablation depth of the target ablation tissue can be significantly increased in the polarity configuration mode of the head-end electrode with the electrodes on two electrode arms, and the maximum damage depth can be increased by about 20%. Therefore, it can be seen that compared with the polarity configuration mode of the head-end electrode with the electrodes on one electrode arm, the polarity configuration mode of the head-end electrode with the electrodes on two electrode arms can significantly increase not only the ablation width but also the ablation depth.

[0028] In this embodiment, preferably, the head end electrode 100, when specifically used to abut against the target ablation tissue, is configured with a polarity opposite to that of the electrodes 210 on 2 to 10 or more electrode arms 200, so as to transmit ablation energy to the target ablation tissue for ablation. More preferably, the head end electrode 100, when specifically used to abut against the target ablation tissue, is configured with a polarity opposite to that of the electrodes 210 on 2 to 6 or more electrode arms 200, so as to transmit ablation energy to the target ablation tissue for ablation. Figure 8 As shown, when the head-end electrode 100 is matched with more electrodes 210 on the electrode arms 200, the ablation depth of the target ablation tissue will further increase, but when the number of electrode arms 200 matched with the head-end electrode 100 exceeds 6, the ablation depth of the target ablation tissue will no longer increase. Therefore, considering the ablation depth and the discharge safety of the catheter, it is believed that the polarity configuration mode of the head-end electrode 100 matched with 2 to 6 electrodes 210 on the electrode arms 200 is the optimal polarity configuration mode, that is, the polarity of the head-end electrode 100 is configured to be opposite to the polarity of the electrodes 210 on 2 to 6 electrode arms 200 as the optimal polarity configuration mode. Specifically, the specific number of electrode arms 200 matched with the head-end electrode 100 can be selected according to the actual ablation depth of the target ablation tissue.

[0029] like Fig. 9 and Fig.10 As shown, as an implementation mode, in the embodiment of the present application, it also includes: a bracket 400, the bracket 400 includes a bracket connecting portion 410 and a plurality of bracket arms 420 of the same number as the electrode arms 200; each bracket arm 420 is inserted into each electrode arm 200; the distal end of each electrode arm 200 is connected to the distal end of each bracket arm 420 and the proximal end of the bracket connecting portion 410; the distal end of the bracket connecting portion 410 is abutted against the proximal end of the head end electrode 100.

[0030] In this embodiment, by providing a bracket 400, the electrode arm 200 and the head end electrode 100 can be effectively supported, and the electrode 210 on the electrode arm 200, the head end electrode 100 and the bracket 400 are not electrically conductive to each other. The inner side of the electrode 210 on the electrode arm 200 except the part connected to the wire may be provided with an insulating coating, and the proximal end of the head end electrode 100 except the part connected to the wire may be provided with an insulating coating. Alternatively, the bracket connecting portion 410 and each bracket arm 420 may be made of an insulating material, or the outer surfaces of the bracket connecting portion 410 and each bracket arm 420 may be provided with an insulating coating.

[0031] As an implementation manner, in the embodiment of the present application, the bracket connection portion 410 and each bracket arm 420 are made of an insulating material, or the outer surfaces of the bracket connection portion 410 and each bracket arm 420 are provided with an insulating coating.

[0032] In this embodiment, by adopting a support connecting part 410 and each support arm 420 made of insulating material, or providing an insulating coating on the outer surfaces of the support connecting part 410 and each support arm 420, the electrode 210 on each electrode arm 200 and each support arm 420, and the head end electrode 100 and the support connecting part 410 can be insulated and isolated, which can effectively ensure that the head end electrode 100 and / or the electrode 210 on each electrode arm 200 can withstand high-pressure discharge, and can effectively reduce the risk of arc initiation.

[0033] like Fig.10 and Fig.11 As shown, as an implementation mode, in the embodiment of the present application, it also includes: an insulating ring 500; the insulating ring 500 is arranged between the distal end of the bracket connecting part 410 and the proximal end of the head end electrode 100, and the insulating ring 500 is used to insulate and isolate the distal end of the bracket connecting part 410 and the proximal end of the head end electrode 100.

[0034] In this embodiment, by providing an insulating ring 500 between the distal end of the bracket connecting portion 410 and the proximal end of the head end electrode 100, the insulation isolation between the distal end of the bracket connecting portion 410 and the proximal end of the head end electrode 100 can be effectively strengthened, so that even when the insulation effect of the insulating coating at the distal end of the bracket connecting portion 410 is poor or the coating is worn, insulation isolation can be achieved between the distal end of the bracket connecting portion 410 and the proximal end of the head end electrode 100, which can further ensure that the head end electrode 100 can withstand high-voltage discharge and can further reduce the risk of arc initiation.

[0035] like Figures 9 to 11 As shown, as an implementation mode, in the embodiment of the present application, it also includes: an inner tube 600; the inner tube 600 is coaxially movably arranged in the tube body 300; the inner wall of the distal end of the inner tube 600 is fixedly connected to the outer wall of the proximal end of the head end electrode 100; the outer wall of the distal end of the inner tube 600 is fixedly connected to the inner wall of the bracket connecting part 410.

[0036] In this embodiment, the inner tube 600 can be a hollow structure, and multiple electrode arms 200 are arranged around the inner tube 600. Preferably, the multiple electrode arms 200 are arranged at equal intervals around the inner tube 600. A part of the wire connected to the head end electrode 100 and used to receive the pulse signal is arranged in the inner tube 600 and the other part is arranged in the tube body 300. A through hole is provided at the center position of the bracket connecting part 410. The distal end of the inner tube 600 passes through the through hole at the center position of the bracket connecting part 410, and the outer wall of the distal end of the inner tube 600 is fixedly connected to the inner wall of the bracket connecting part 410. The proximal end of the inner tube 600 passes through the tube body 300 and is connected to the handle. A gear mechanism can be provided on the handle. By pushing the gear mechanism on the handle, the inner tube 600 can move proximally or distally relative to the tube body 300 and the handle, so that each bracket arm 420 drives each electrode arm 200 to switch between an extended state and a contracted state.

[0037] like Figures 10 to 12 As shown, as an implementation mode, in the embodiment of the present application, the head end electrode 100 includes a head end electrode abutment portion 110 and a head end electrode connecting portion 120; the distal end of the head end electrode abutment portion 110 is used to abut against the target ablation tissue; the proximal end of the head end electrode abutment portion 110 is fixedly connected to the distal end of the head end electrode connecting portion 120, the proximal end of the head end electrode abutment portion 110 abuts against the distal end of the inner tube 600 and the distal end of the bracket connecting portion 410, or the proximal end of the head end electrode abutment portion 110 abuts against the distal end of the inner tube 600 and the distal end of the insulating ring 500; the inner wall of the distal end of the inner tube 600 is fixedly connected to the outer wall of the head end electrode connecting portion 120.

[0038] In this embodiment, the outer surface of the distal end of the head end electrode abutment portion 110 can be a smooth curved surface, and the head end electrode abutment portion 110 can be well abutted against the target ablation tissue. The outer wall of the head end electrode connecting portion 120 is fixedly connected to the inner wall of the inner tube 600, so that the fixing effect of the head end electrode connecting portion 120 and the inner tube 600 is very good, and the head end electrode 100 can be effectively fixed to the distal end of the inner tube 600.

[0039] like Fig.11 and Fig.12 As shown, as an implementation mode, in the embodiment of the present application, the outer surface of the distal end of the head end electrode abutment portion 110 is semicircular or semi-elliptical or arc-shaped.

[0040] In this embodiment, by setting the outer surface of the distal end of the head end electrode abutment portion 110 to be semicircular, semi-elliptical or arc-shaped, the head end electrode abutment portion 110 can abut against the target ablation tissue more smoothly and more easily form a good abutment.

[0041] like Fig. 9As shown, as an implementation mode, in the embodiment of the present application, a plurality of electrodes 210 are arranged on each electrode arm 200; the plurality of electrodes 210 are arranged along the length direction of the electrode arm 200; and the positions of the plurality of electrodes 210 on each electrode arm 200 are respectively the same.

[0042] In this embodiment, each electrode arm 200 can be an arc-shaped structure, and the head end electrode 100 and each electrode 210 on the electrode arm 200 are independent of each other in electrical characteristics, and the insulation withstand voltage between them is above 500V. By making each electrode arm 200 in an extended state, the electrodes 210 at the same position on multiple electrode arms 200 can be attached to the myocardium at the same time, and by making the electrodes 210 at the same position release energy at the same time, a circular electric field can be formed to achieve circular ablation.

[0043] In the present embodiment, since the electrodes 210 at the same position release energy at the same time, a circular electric field can be formed. Preferably, each electrode arm 200 is provided with a plurality of electrodes 210 of the same number. Specifically, preferably, each electrode arm is provided with 2-6 electrodes. The polarity of the electrodes 210 on each electrode arm 200 can be configured. Specifically, the polarities of the electrodes 210 at the same position on the plurality of electrode arms 200 may be the same, and the polarities of two adjacent electrodes 210 on each electrode arm 200 may be opposite, so that multiple circular electric fields can be formed, which can effectively improve the efficiency of circular ablation.

[0044] The embodiments in this specification are described in a progressive manner, and each embodiment focuses on the As for the differences between other embodiments, the same or similar parts between each embodiment may be referred to each other.

[0045] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An ablation catheter, characterized in that: include: A head electrode, a plurality of electrode arms and a tube body; The head end electrode is arranged at the distal end of each electrode arm, and the proximal end of each electrode arm is connected to the distal end of the tube body; Each of the electrode arms is provided with at least one electrode; The head end electrode is configured to have a polarity opposite to the polarity of the electrode on at least one of the electrode arms when it is in contact with the target ablation tissue, so as to transmit ablation energy to the target ablation tissue for ablation.

2. The ablation catheter according to claim 1, characterized in that: The head end electrode is specifically used to be configured with a polarity opposite to the polarity of the electrodes on the two or more electrode arms when it is in contact with the target ablation tissue, so as to transmit ablation energy to the target ablation tissue for ablation.

3. The ablation catheter according to claim 2, characterized in that: Also includes: A bracket, the bracket comprising a bracket connecting portion and a plurality of bracket arms having the same number as the electrode arms; Each of the support arms is inserted into each of the electrode arms; The distal end of each electrode arm is connected to the distal end of each support arm and the proximal end of the support connecting portion; The distal end of the bracket connecting portion abuts against the proximal end of the head end electrode.

4. The ablation catheter according to claim 3, characterized in that: The support connection portion and each of the support arms are made of insulating material, or the outer surfaces of the support connection portion and each of the support arms are provided with an insulating coating.

5. The ablation catheter according to claim 4, characterized in that: Also includes: Insulation ring; The insulating ring is arranged between the distal end of the support connecting part and the proximal end of the head end electrode, and the insulating ring is used to insulate and isolate the distal end of the support connecting part and the proximal end of the head end electrode.

6. The ablation catheter according to claim 4 or 5, characterized in that: Also includes: Inner tube; The inner tube is coaxially movably arranged in the tube body; The inner wall of the distal end of the inner tube is fixedly connected to the outer wall of the proximal end of the head end electrode; The outer wall of the distal end of the inner tube is fixedly connected to the inner wall of the bracket connecting part.

7. The ablation catheter according to claim 6, characterized in that: The head end electrode comprises a head end electrode abutting portion and a head end electrode connecting portion; The distal end of the head end electrode abutment portion is used to abut against the target ablation tissue; The proximal end of the head end electrode abutment portion is fixedly connected to the distal end of the head end electrode connection portion, the proximal end of the head end electrode abutment portion abuts against the distal end of the inner tube and the distal end of the bracket connection portion, or the proximal end of the head end electrode abutment portion abuts against the distal end of the inner tube and the distal end of the insulating ring; The inner wall of the distal end of the inner tube is fixedly connected to the outer wall of the head end electrode connecting portion.

8. The ablation catheter according to claim 7, characterized in that: The outer surface of the distal end of the head end electrode abutment portion is semicircular, semi-elliptical or arc-shaped.

9. The ablation catheter according to claim 1, characterized in that: Each of the electrode arms is provided with a plurality of electrodes; A plurality of electrodes are arranged along the length direction of the electrode arm; The positions of the plurality of electrodes on each of the electrode arms are respectively the same.

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