Ablation catheter, and ablation device and ablation control method thereof

Abstract

An ablation catheter, comprising a catheter body (10) and a plurality of splines (20). The plurality of splines (20) are arranged at the distal end of the catheter body (10), and each spline (20) comprises a protective tube (210) and at least one electrode ring (220) arranged on the protective tube (210). Each electrode ring (220) comprises a plurality of sub-electrodes (221) spaced apart from each other in the circumferential direction of the protective tube (210), and wires of the sub-electrodes (221) are accommodated in the protective tube (210) and are adapted to be electrically connected to an ablation system. The ablation catheter provides an ablation catheter structure capable of enabling energy of an ablation electric field to act on the myocardial tissue more intensively, thereby reducing the loss and side effects of current in blood and enhancing the safety and effectiveness of ablation surgery.

Description

Ablation catheter, ablation device and ablation control method thereof Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an ablation catheter, an ablation device and an ablation control method thereof. Background Art

[0002] In some cases, an ablation catheter includes a catheter and an electrode ring assembly, which is disposed at the distal end of the catheter and includes multiple electrode rings disposed on branches of the catheter. When an electrical pulse passes through the electrode rings, the electric field on the surface of the electrode rings shifts from positive to negative, forming an ablation field. This energy is emitted and dispersed around the electrode rings.

[0003] However, the electrode of this type of ablation catheter is an integral ring-shaped structure, and the overall volume of the electrode is generally large. In the case of a single electrode ring, part of the single electrode is in contact with the atrial tissue, while the other part of the electrode itself is surrounded by blood. Since the conductivity of blood is higher than that of atrial tissue, the discharge between the positive and negative electrodes will form arcs and bubbles, which can cause most of the energy of the pulsed electric field to be lost through the blood. At the same time, the bubbles and microthrombi generated in the blood can cause so-called invisible cerebral infarction. The electric field of the electrode surface of a single electrode, where only a part is applied to the atrial wall, acts on the myocardium, creating an ablation lesion, which is used for atrial fibrillation ablation. Therefore, traditional ablation catheters have large current losses in the blood and side effects.

[0004] Summary of the Invention

[0005] The main purpose of the present invention is to provide an ablation catheter, an ablation device and an ablation control method thereof, aiming to split the electrode ring to control the discharge of the sub-electrodes applied to the atrial wall, and control the sub-electrodes surrounded by blood to not discharge, thereby reducing the loss of current in the blood and side effects, and enhancing the safety and effectiveness of the ablation procedure.

[0006] To achieve the above-mentioned objectives, the present invention proposes an ablation catheter, comprising: a catheter body; and a plurality of splines, wherein the plurality of splines are arranged at the distal end of the catheter body, each of the splines includes a protective tube and at least one electrode ring provided on the protective tube, the electrode ring includes a plurality of sub-electrodes arranged at circumferential intervals along the protective tube, the wires of the sub-electrodes are accommodated in the protective tube and are suitable for electrical connection with the ablation system.

[0007] In one embodiment, the protective tube is provided with a plurality of insulating ribs spaced apart along its circumference to form a plurality of splicing positions, and the plurality of sub-electrodes are fixed one-to-one to the plurality of splicing positions to form the electrode ring.

[0008] In one embodiment, the electrode ring further includes an insulator provided on the protection tube, and a plurality of the sub-electrodes are evenly spaced and arranged on the insulator to form the electrode ring.

[0009] In one embodiment, the insulator is an insulating sleeve or an insulating coating.

[0010] In one embodiment, the ablation catheter further includes an inner tube, a shape control head and a frame, the inner tube portion is inserted into the catheter body, the frame is composed of a plurality of the protective tubes or the frame includes a plurality of memory alloy parts respectively accommodated in a plurality of the protective tubes, the shape control head is provided on the distal end of the inner tube and is fixed on the ends of the plurality of the protective tubes, the shape control head is used to control the shape of the frame, and the inner tube and the catheter body can move relative to each other along the length direction of the ablation catheter.

[0011] To achieve the above-mentioned purpose, the present invention also proposes an ablation device, comprising: an ablation catheter, which is the ablation catheter as described above; the ablation catheter comprises: a catheter body; and a plurality of splines, wherein the plurality of splines are arranged at the distal end of the catheter body, each of the splines comprises a protective tube and at least one electrode ring arranged on the protective tube, the electrode ring comprises a plurality of sub-electrodes arranged at circumferential intervals along the protective tube, the wires of the sub-electrodes are accommodated in the protective tube and are suitable for being electrically connected to the ablation system; and an ablation system, which is connected to the sub-electrode wires of the ablation catheter, and the ablation system is used to control the discharge of the sub-electrodes.

[0012] In one embodiment, the ablation system includes a host computer, a controller, a power supply module, an impedance detection module, a function switching module and a mapping module. The host computer is electrically connected to the controller, the power supply module and the impedance detection module are electrically connected to the controller respectively, and the function switching module is electrically connected to the impedance detection module; the impedance detection module is used to test the impedance between the sub-electrode and the reference electrode; the function switching module is used to control the working state of the mapping module according to the control signal of the controller, and select energy output, impedance detection or mapping; the mapping module is used to collect, receive or input potential information, and output mapping electrical signals.

[0013] To achieve the above-mentioned purpose, the present invention also proposes an ablation control method. Based on the above-mentioned ablation device, the ablation control method includes the following steps: after the ablation catheter contacts the part to be ablated, testing the impedance between each sub-electrode and the reference electrode to obtain an impedance detection value; judging the application status of each sub-electrode based on the impedance detection value; closing the sub-electrode in the liquid-surrounded state, and controlling the discharge of the sub-electrode in the contact state with the part to be ablated.

[0014] In one embodiment, the reference electrode is an electrode located at the proximal or distal end of the ablation catheter and in the blood; the step of judging the application status of each sub-electrode based on the impedance detection value is: determining the sub-electrode corresponding to the impedance detection value less than or equal to N times the impedance threshold of the reference electrode in the blood as a liquid-surrounded state; determining the sub-electrode corresponding to the impedance detection value greater than N times the impedance threshold of the reference electrode in the blood as a contact state with the part to be ablated.

[0015] In one embodiment, the reference electrode is any one of the sub-electrodes; the step of judging the adhesion state of each of the sub-electrodes according to the impedance detection value includes: after obtaining all the impedance detection values, arranging them in order from small to large as: R1, R2, R3...Rn; taking the smallest impedance detection value as R0, and calculating the difference ΔR between the impedance detection values ​​of the other sub-electrodes and R0; determining the sub-electrode corresponding to the difference ΔR less than or equal to the first threshold as a liquid-surrounded state; determining the sub-electrode corresponding to the difference ΔR greater than or equal to the second threshold as a high adhesion state with the part to be ablated; determining the sub-electrode corresponding to the difference ΔR between the first threshold and the second threshold as a low adhesion state with the part to be ablated.

[0016] In the technical solution of the present invention, the ablation catheter includes a catheter body and multiple splines, each of which is disposed at the distal end of the catheter body. Each spline includes a protective tube and at least one electrode ring disposed on the protective tube. The electrode ring includes a plurality of sub-electrodes spaced circumferentially along the protective tube. The sub-electrode wires are housed in the protective tube and are suitable for electrical connection to the ablation system. Thus, by using the ablation catheter structure described above, each sub-electrode is connected to the ablation system, and the sub-electrodes can be controlled to discharge individually, simultaneously, or not at all in different time sequences. This allows the energy of the ablation electric field to be more concentrated on the myocardial tissue, thereby effectively reducing current loss and side effects in the blood, greatly enhancing the safety and effectiveness of the ablation procedure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0018] FIG1 is a schematic structural diagram of an ablation catheter according to an embodiment of the present invention;

[0019] FIG2 is a front view of an embodiment of an ablation catheter of the present invention;

[0020] FIG3 is a side view of an embodiment of an ablation catheter of the present invention;

[0021] FIG4 is a schematic structural diagram of a spline and an electrode ring in a first embodiment of an ablation catheter according to the present invention;

[0022] FIG5 is a front view of the spline and electrode ring in the first embodiment of the ablation catheter of the present invention;

[0023] FIG6 is a cross-sectional view taken along line AA in FIG5 ;

[0024] FIG7 is a schematic structural diagram of a spline and an electrode ring in a second embodiment of an ablation catheter according to the present invention;

[0025] FIG8 is a front view of the spline and electrode ring in the second embodiment of the ablation catheter of the present invention;

[0026] FIG9 is a cross-sectional view taken along line BB in FIG8 ;

[0027] FIG10 is a schematic structural diagram of a spline and an electrode ring in a third embodiment of an ablation catheter according to the present invention;

[0028] FIG11 is a front view of the spline and electrode ring in the third embodiment of the ablation catheter of the present invention;

[0029] FIG12 is a cross-sectional view taken along line CC in FIG11 ;

[0030] FIG13 is a structural block diagram of an ablation system in an embodiment of an ablation device of the present invention;

[0031] FIG14 is a flow chart of an embodiment of an ablation control method for an ablation device according to the present invention;

[0032] FIG15 is a detailed flow chart of an embodiment of an ablation control method for an ablation device of the present invention;

[0033] FIG16 is a detailed flowchart of another embodiment of the ablation control method of the ablation device of the present invention.

[0034] Description of Figure Numbers:

[0035] 10. Catheter body; 20. Spline; 210. Protective tube; 220. Electrode ring; 221. Sub-electrode; 211. Insulating rib; 222. Insulator; 11. Inner tube; 12. Shape control head; 310. Host computer; 320. Controller; 330. Power supply module; 340. Impedance detection module; 350. Function switching module; 360. Marking module; 370. Sound and light alarm module.

[0036] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0038] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution in which both A and B are satisfied. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] The present invention provides an ablation catheter, which relates to a system for treating arrhythmia by using a pulsed electric field ablation technology, and in particular to an ablation catheter for treating arrhythmia.

[0041] 1 to 6 , in one embodiment of the present invention, the ablation catheter includes a catheter body 10 and a plurality of splines 20 , wherein the plurality of splines 20 are arranged at the distal end of the catheter body 10 , and each spline 20 includes a protective tube 210 and at least one electrode ring 220 provided on the protective tube 210 , and the electrode ring 220 includes a plurality of sub-electrodes 221 arranged at circumferential intervals along the protective tube 210 , and the wires of the sub-electrodes 221 are accommodated in the protective tube 210 and are suitable for being electrically connected to the ablation system.

[0042] In this embodiment, the spline 20 is a branch of the catheter body 10 , which may be a tubular structure and may be one, two or more in number, which is not limited here.

[0043] The electrode ring 220 can be composed of at least two sub-electrodes 221 in sheet or block shapes. The sub-electrodes 221 can be assembled together by splicing and separated by insulating material or insulating structure to prevent mutual interference. Of course, the sub-electrodes 221 can also be installed on an insulating component or embedded in an insulating material to form an integrated electrode ring 220, which is then sleeved on the protective tube 210. The specific structural formation method of the electrode ring 220 is not limited here.

[0044] It can be understood that the present invention adopts the ablation catheter with the above structure, and each sub-electrode 221 is connected to the ablation system, which can control the sub-electrodes 221 to discharge individually in different time sequences, discharge individually at the same time, or not discharge at all, so that the energy of the ablation electric field can be more concentrated on the myocardial tissue, thereby effectively reducing the loss of electric current in the blood and side effects, and greatly enhancing the safety and effectiveness of the ablation technique.

[0045] In order to improve the assembly convenience of the ablation catheter, mainly referring to Figures 4 to 6, in one embodiment, the protective tube 210 may be provided with a plurality of insulating ribs 211 distributed along its circumference to form a plurality of splicing positions, and a plurality of sub-electrodes 221 are fixed one-to-one on the plurality of splicing positions to form an electrode ring 220.

[0046] In this embodiment, the sub-electrode 221 can be fixed on the splicing position by bonding or clamping, etc., which is not limited here.

[0047] Mainly referring to FIG. 7 to FIG. 12 , in some other embodiments, the electrode ring 220 may further include an insulator 222 disposed on the protection tube 210 , and a plurality of sub-electrodes 221 are evenly spaced and disposed on the insulator 222 to constitute the electrode ring 220 .

[0048] In this embodiment, the insulator 222 may be an insulating sleeve (as shown in FIG. 7 to FIG. 9 ) or an insulating coating (as shown in FIG. 10 to FIG. 12 ), etc., which is not limited here.

[0049] It is understood that, as shown in Figures 7 to 9, when the insulator 222 is an insulating sleeve, the electrode rings 220 can be individually batch-processed and then assembled on the protective tube 210, effectively improving production efficiency and reducing manufacturing costs. As shown in Figures 10 to 12, when the insulator 222 is an insulating coating, its thickness is relatively small, which can reduce the overall size of the spline 20.

[0050] Please refer to Figures 1 to 3. In some embodiments, the ablation catheter may also include an inner tube 11, a shape control head 12 and a frame. The inner tube 11 is partially inserted into the catheter body 10. The frame is composed of multiple protective tubes 210 or the frame includes multiple memory alloy parts respectively accommodated in multiple protective tubes 210. The shape control head 12 is arranged on the distal end of the inner tube 11 and is fixed to the ends of the multiple protective tubes 210. The shape control head 12 is used to control the shape of the frame.

[0051] In this embodiment, the inner tube 11 and the catheter body 10 can move relative to each other along the length direction of the ablation catheter.

[0052] The morphology control head 12 is connected to the head of the frame. When the morphology control head 12 moves, the inner tube 11 and the catheter body 10 move relative to each other, which can control the morphology change of the frame, so that the frame shape changes from the initial tubular shape to the rugby shape and the spherical shape. This process can change the maximum radius of the frame to adapt to pulmonary veins of different sizes and shapes, so that the spline 20 of the ablation catheter can better adapt to the ablation environment, so that the sub-electrode 221 can be better applied to the area to be ablated or extended into the inside of the pulmonary vein for mapping and ablation, which is conducive to further improving the effectiveness and safety of the ablation technique.

[0053] The present invention also proposes an ablation device, which includes an ablation catheter. The specific structure of the ablation catheter refers to the above-mentioned embodiment. Since the ablation device proposed by the present invention includes all schemes of all embodiments of the above-mentioned ablation catheter, it has at least the same technical effects as the above-mentioned ablation catheter, which will not be elaborated here one by one.

[0054] Mainly referring to FIG1 , FIG6 and FIG13 , in one embodiment of the present invention, the ablation device includes an ablation catheter and an ablation system. The ablation system is connected to the sub-electrode 221 of the ablation catheter by a wire, and the ablation system is used to control the discharge of the sub-electrode 221 .

[0055] To facilitate wiring, in this embodiment, the wires of the sub-electrodes 221 can be connected to the ablation system via a multi-way connector.

[0056] Mainly referring to FIG13 , in one embodiment, the ablation system may include a host computer 310, a controller 320, a power module 330, an impedance detection module 340, a function switching module 350, and a mapping module 360. The host computer 310 is electrically connected to the controller 320, the power module 330 and the impedance detection module 340 are electrically connected to the controller 320, and the function switching module 350 is electrically connected to the impedance detection module 340. The impedance detection module 340 is used to test the impedance between the sub-electrode 221 and the reference electrode; the function switching module 350 is used to control the working state of the mapping module 360 ​​according to the control signal of the controller 320, and to select energy output, impedance detection, or mapping; and the mapping module 360 ​​is used to collect, receive, or input potential information and output a mapping electrical signal.

[0057] In this embodiment, the host computer 310 can be a computer, a laptop computer, a tablet computer, etc., and the controller 320 can be a MCU, a DSP, an FPGA, etc., without limitation.

[0058] In addition, referring to Figure 13, the ablation system can also be provided with an audio-visual alarm module 370, which is electrically connected to the controller 320 and is used to output sound signals and light signals according to the control signal of the controller 320 in special circumstances to further improve the safety of the ablation.

[0059] It can be understood that by adopting the above-mentioned ablation system and cooperating with the ablation catheter, it is possible to test the impedance between each sub-electrode 221 and the reference electrode, and to control the electrode to automatically or manually discharge, which is beneficial for concentrating the energy of the ablation electric field on the myocardial tissue, reducing the loss of current in the blood and side effects, and further enhancing the safety and effectiveness of the ablation procedure.

[0060] The present invention further provides an ablation control method. Based on the above-mentioned ablation device, mainly referring to FIG. 14 and FIG. 15 , the ablation control method includes the following steps:

[0061] S10, after the ablation catheter contacts the site to be ablated, measuring the impedance between each of the sub-electrodes and the reference electrode to obtain an impedance detection value;

[0062] S20, judging the application status of each of the sub-electrodes according to the impedance detection value;

[0063] S30, closing the sub-electrode in the liquid-surrounded state, and controlling the sub-electrode in contact with the site to be ablated to discharge.

[0064] It should be noted that the reference electrode can be an electrode near the proximal or distal end of the ablation catheter. When performing ablation, the reference electrode is in the blood; of course, the reference electrode can also be any sub-electrode 221 on the spline 20 of the catheter body 10. In this case, the sub-electrode 221 may appear in the blood or contact with atrial tissue.

[0065] In this embodiment, after the ablation catheter contacts the ablation site, the impedance analysis system of the ablation device measures the impedance between each sub-electrode 221 and the reference electrode. Sub-electrodes 221 with high impedance are in contact with the atrial wall, while sub-electrodes 221 with low impedance are surrounded by fluid. The operator simply turns off the sub-electrodes 221 surrounded by blood and discharges the sub-electrodes 221 in contact with the ablation site.

[0066] It can be understood that by adopting the above-mentioned ablation control method, the energy of the ablation electric field can be more concentrated on the myocardial tissue, thereby effectively reducing the loss of current in the blood and side effects, and greatly enhancing the safety and effectiveness of the ablation procedure.

[0067] 14 and 15 , in one embodiment, the reference electrode is an electrode located at the proximal or distal end of the ablation catheter and in the blood; the step S20 of judging the application status of each sub-electrode based on the impedance detection value is specifically as follows: the sub-electrode corresponding to the impedance detection value being less than or equal to N times the impedance threshold of the reference electrode in the blood is determined to be in a liquid-surrounded state; the sub-electrode corresponding to the impedance detection value being greater than N times the impedance threshold of the reference electrode in the blood is determined to be in a contact state with the part to be ablated.

[0068] In this embodiment, N may be within a certain range, such as 1.2-1.4, or may be a specific value, such as 1.3, which is not limited here.

[0069] In this case, the reference electrode is within the blood, and the impedance between it and the other sub-electrodes 221 can be directly measured using an impedance analysis system. If the impedance value is less than or equal to N times the threshold for electrode placement within the blood, then sub-electrode 221 is within the blood and not in contact with tissue. If the impedance value is greater than N times the threshold, then sub-electrode 221 is in contact with tissue.

[0070] Mainly referring to Figures 14 and 15, in this embodiment, in step S10, it mainly includes two steps: impedance measurement S11 and obtaining impedance data S12; in step S20, it mainly includes two steps: comparing the impedance detection data with the blood threshold S21 and judging whether the impedance detection data is greater than N times the blood threshold S22.

[0071] In another embodiment, referring to FIG. 14 and FIG. 16 , the reference electrode is any one of the sub-electrodes; and the step S20 of determining the application state of each of the sub-electrodes according to the impedance detection value specifically includes:

[0072] S221, after obtaining all the impedance detection values, arrange them in ascending order as: R1, R2, R3, ..., Rn;

[0073] S222, taking the smallest impedance detection value as R0, and calculating the difference ΔR between the impedance detection values ​​of the other sub-electrodes and R0;

[0074] S223. Determine the sub-electrode corresponding to the difference ΔR being less than or equal to the first threshold as being in a liquid-surrounded state; determine the sub-electrode corresponding to the difference ΔR being greater than or equal to the second threshold as being in a high-fit state with the part to be ablated; and determine the sub-electrode corresponding to the difference ΔR being between the first threshold and the second threshold as being in a low-fit state with the part to be ablated.

[0075] In this case, the reference electrode is any sub-electrode 221 on the catheter spline 20, and the sub-electrode 221 may appear in the blood or contact the atrial tissue. In this way, the change in the impedance of the sub-electrode 221 will be much greater than the case where the reference electrode is only in the blood. The present invention uses a new algorithm to infer the electrode adhesion. First, all the tested impedances are arranged in order of size to obtain R1, R2, R3...Rn. The smallest impedance is taken as R0, and the difference ΔR between the impedance values ​​of other sub-electrodes 221 and R0 is used to judge the electrode adhesion method. By adopting this algorithm, the changes and errors caused by the reference electrode and blood or tissue can be avoided, and the judgment of the adhesion status of the sub-electrode 311 can be more accurate.

[0076] Specifically, the first threshold value may be 10Ω. When the difference ΔR is less than or equal to 10Ω, it indicates that the sub-electrode 221 is in a liquid-surrounded state. The second threshold value may be 30Ω. When the difference ΔR is greater than or equal to 30Ω, it indicates that the corresponding sub-electrode 221 is in a highly adhered state with the ablation site. When the difference ΔR is between 10Ω and 30Ω, it indicates that the corresponding sub-electrode 221 is in a poorly adhered state with the ablation site.

[0077] It should be noted that in actual experiments, apart from the degree of contact force, there was no significant difference between the sub-electrodes 221 in a low contact state and a high contact state with the ablation site. The average therapeutic effect of the sub-electrodes 221 in the liquid-surrounded state was significantly lower than that of the sub-electrodes 221 in the low contact state and the high contact state with the ablation site. For the atrial wire, the sub-electrodes 221 in the low contact state and the high contact state achieved acute conduction block, while the sub-electrode 221 in the liquid-surrounded state had a conduction gap detected through electroanatomical mapping.

[0078] In addition, it is worth mentioning that when in use, the impedance test interface of the ablation system can display the location (application status), serial number and measured impedance value of each sub-electrode 221. The doctor can directly select the reference electrode on this interface, and the ablation system can automatically calculate the impedance difference ΔR between the electrodes, and according to the range of variation of the difference ΔR, give different sub-electrode 221 abutment conditions, and automatically display the abutment properties of the catheter (for example, the corresponding icon of the sub-electrode 221 is black to indicate abutment with the tissue, and the corresponding icon is red to indicate in the blood). The ablation system can automatically control the power supply of the abutting electrode and turn off the electrode in the blood. At the same time, the doctor can also manually adjust the switch of the discharge sub-electrode 311 on the artificial intelligence interface.

[0079] The above descriptions are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present description and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. An ablation device, characterized in that: include: An ablation catheter, the ablation catheter comprising a catheter body, a plurality of splines, an inner tube, a shape control head and a frame, the plurality of splines being arranged at the distal end of the catheter body, each of the splines comprising a protective tube and at least one electrode ring arranged on the protective tube, the electrode ring comprising a plurality of sub-electrodes arranged at intervals along the circumference of the protective tube, the wires of the sub-electrodes being accommodated in the protective tube and being suitable for being electrically connected to an ablation system; the inner tube portion is inserted into the catheter body, the frame is composed of a plurality of the protective tubes or the frame comprises a plurality of memory alloy parts respectively accommodated in a plurality of the protective tubes, the shape control head is arranged at the distal end of the inner tube and sleeves the ends of the plurality of the protective tubes, the shape control head is used to control the shape of the frame, the inner tube and the catheter body can move relative to each other along the length direction of the ablation catheter; as well as An ablation system is connected to the sub-electrode wire of the ablation catheter. The ablation system includes an impedance detection module for testing the impedance between the sub-electrode and the reference electrode to obtain an impedance detection value. The ablation system determines the application status of each sub-electrode based on the impedance detection value, controls the discharge of the sub-electrode in contact with the part to be ablated, and closes the sub-electrode surrounded by liquid.

2. The ablation device according to claim 1, characterized in that: The protection tube is provided with a plurality of insulating convex ribs spaced apart along the circumference thereof to form a plurality of splicing positions, and a plurality of the sub-electrodes are fixed one-to-one on the plurality of splicing positions to form the electrode ring.

3. The ablation device according to claim 1, characterized in that: The electrode ring further comprises an insulator arranged on the protection tube, and a plurality of sub-electrodes are evenly arranged on the insulator at intervals to form the electrode ring.

4. The ablation device according to claim 3, characterized in that: The insulator is an insulating sleeve or an insulating coating.

5. The ablation device according to claim 1, characterized in that: The ablation system further includes a host computer, a controller, a power module, a function switching module and a mapping module, wherein the host computer is electrically connected to the controller, the power module and the impedance detection module are electrically connected to the controller respectively, and the function switching module is electrically connected to the impedance detection module; The function switching module is used to control the working state of the mapping module and select energy output, impedance detection or mapping according to the control signal of the controller; The mapping module is used to collect, receive or input potential information and output a mapping electrical signal.

6. The ablation device according to claim 1, characterized in that: The control method of the ablation device comprises the following steps: After the ablation catheter contacts the part to be ablated, the impedance between each of the sub-electrodes and the reference electrode is tested to obtain an impedance detection value; According to the impedance detection value, determining the application state of each of the sub-electrodes; The sub-electrode in the state of being surrounded by liquid is closed, and the sub-electrode in the state of being in contact with the to-be-ablated site is controlled to discharge.

7. The ablation device according to claim 6, characterized in that: The reference electrode is an electrode located at the proximal or distal end of the ablation catheter and in the blood; the step of judging the application state of each sub-electrode according to the impedance detection value is as follows: The sub-electrode corresponding to the impedance detection value being less than or equal to N times the impedance threshold of the reference electrode between the blood is determined to be in a liquid-surrounded state; the sub-electrode corresponding to the impedance detection value being greater than N times the impedance threshold of the reference electrode between the blood is determined to be in a contact state with the part to be ablated.

8. The ablation device according to claim 6, characterized in that: The reference electrode is any one of the sub-electrodes; and the step of judging the application state of each of the sub-electrodes according to the impedance detection value comprises: After all the impedance detection values ​​are obtained, they are arranged in order from small to large: R1, R2, R3...Rn; The smallest impedance detection value is taken as R0, and the difference ΔR between the impedance detection values ​​of the other sub-electrodes and R0 is calculated; The sub-electrode corresponding to the difference ΔR being less than or equal to the first threshold is determined to be in a liquid-surrounded state; the sub-electrode corresponding to the difference ΔR being greater than or equal to the second threshold is determined to be in a high fit state with the part to be ablated; the sub-electrode corresponding to the difference ΔR being between the first threshold and the second threshold is determined to be in a low fit state with the part to be ablated.

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