A combined pulsed electric field ablation catheter device

Abstract

The present application relates to a kind of combined pulse electric field ablation catheter device, including endoscope tube and electrode catheter, wherein electrode catheter has helical section and control end, its helical section is attached around the head end of endoscope tube, and its one end is fixedly arranged in the head end of endoscope tube;Wherein, when electrode catheter and endoscope tube occur relative movement, the helical section of electrode catheter can expand or contract.Endoscope tube outside can also be provided with spiral clamping groove, for leading helical section movement.Electrode catheter can be operated by transmission structure arranged outside endoscope tube.The present application realizes the contraction and expansion of helical electrode, makes the abutting radius of helical electrode variable, makes its abutting radius slightly larger or smaller, adjusts the abutting radius according to the size of intratracheal passage, so that electrode catheter and the wall of airway to be treated are combined more in place, avoid leakage point, improve treatment efficiency;Meanwhile, helical electrode is wound around endoscope, so that the two are combined into one, improve operation convenience.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to a combined pulsed electric field ablation catheter device. Background Technology

[0002] Chronic obstructive pulmonary disease (COPD) is a common, preventable, and treatable disease characterized by persistent airflow limitation. COPD progresses gradually: in its early stages, symptoms are not obvious, manifesting as cough and sputum production, which patients may not easily notice, making this the optimal time for treatment; however, due to its subtlety, patients often miss this early treatment window. In later stages, COPD can lead to bronchial obstruction and even emphysema.

[0003] Pulsed electric field ablation is a novel treatment technology for COPD. It utilizes an electrode catheter to create a localized high electric field for tissue ablation, creating irreversible perforations of a few nanometers to several micrometers in the cell membrane to achieve precise, safe, and efficient treatment. However, due to its relatively short development history and limited clinical experience, pulsed electric field therapy still faces several challenges: the electrode catheter is difficult to adhere to the target site, easily leading to ablation leaks. These leaks can cause recurrence, requiring repeat surgery, which not only affects patient treatment but also incurs high costs and causes significant tissue damage, greatly increasing overall treatment costs. To address the issue of poor catheter adhesion and ablation leaks, some existing electrode catheters employ adjustable umbrella-shaped or mesh designs. However, within the small diameter, the more complex the structure, the more difficult it is to adjust and control, resulting in inconsistent ablation effects and poor uniformity. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art by providing a combined pulsed electric field ablation catheter device that is adjustable, structurally safe and efficient.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] An endoscope tube has a head end and a tail end, and a light source channel and an imaging channel are provided inside the endoscope tube;

[0007] An electrode catheter has a helical section and a control end. The helical section is provided with a plurality of ablation electrodes. The helical section of the electrode catheter is attached to and wrapped around the outer surface of the head end of the endoscope tube and is axially spirally distributed from the head end to the tail end of the endoscope tube. The helical section is fixedly disposed at the head end of the endoscope tube on the side away from the control end.

[0008] When the control end of the electrode catheter moves relative to the endoscope tube, the spiral section of the electrode catheter can expand or contract along the radial direction of the endoscope tube.

[0009] In another preferred embodiment, the outer surface of the tip of the endoscope tube is provided with a spiral groove, the shape of which is adapted to the spiral section of the electrode conduit, the spiral section of the electrode conduit is disposed in the groove, and the spiral section of the electrode conduit is partially exposed outside the groove.

[0010] In another preferred embodiment, the slot is provided with a limiting unit on the side near the control end of the electrode catheter, and the spiral segment of the electrode catheter passes through the limiting unit; when the control end of the electrode catheter is displaced relative to the endoscope tube, the limiting unit guides the spiral segment of the electrode catheter to expand or contract along the slot.

[0011] In another preferred embodiment, the limiting unit is a baffle, the two ends of which are connected to the two sides of the slot to form an annular closed structure with the bottom surface of the slot, and the spiral section of the electrode conduit passes through the annular closed structure.

[0012] In another preferred embodiment, a transmission structure is provided on the outside of the endoscope tube. The transmission structure includes a sleeve and an operating mechanism. The sleeve is fixedly disposed on the outside of the endoscope tube. One side of the spiral section of the electrode conduit extends into the sleeve and is connected to the operating mechanism. Under the drive of the operating mechanism, the spiral section of the electrode conduit moves axially along the sleeve.

[0013] In another preferred embodiment, the inner wall of the sleeve is provided with a threaded groove on the side near the electrode conduit, the operating mechanism includes a threaded post and a rotating rod connected to each other, the threaded post is fitted into the threaded groove, and the threaded post is movably connected to the helical section of the electrode conduit, and the rotating rod extends out of the sleeve to connect to the external operating end.

[0014] In another preferred embodiment, the sleeve is provided with a limiting block on the side near the electrode conduit, and the limiting block is provided with a through hole, through which the non-fixed end of the spiral section of the electrode conduit passes and is movably connected to the threaded post of the operating mechanism.

[0015] In another preferred embodiment, a reflective mechanism is provided on one side of the tip of the endoscope tube. The reflective mechanism includes a reflector and a support rod. One end of the support rod is fixed to the reflector, and the other end is connected to the tip of the endoscope tube.

[0016] In another preferred embodiment, the support rod is a telescopic rod that can adjust the distance between the reflector and the tip of the endoscope tube so that the light from the light source channel can illuminate the ablation electrode.

[0017] In another preferred embodiment, the reflector is an arc-shaped plate with its concave surface facing the endoscope tube, and the outer diameter of the projected reflection of the reflector at the end of the endoscope tube is not greater than the outer diameter of the endoscope tube.

[0018] In another preferred embodiment, the spiral segment of the ablation catheter has at least one more turn, and the ablation electrodes are spaced apart on the spiral segment of the ablation catheter to form an ablation electrode assembly with a ring structure.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1) In this application, one end of the electrode catheter is configured as a spiral structure, with an ablation electrode spaced between the spiral structure and the endoscope tube. The spiral electrode catheter is fixedly connected to the endoscope tube tip by the interaction of the electrode catheter and the endoscope tube. By moving the non-spiral section of the electrode catheter, the spiral section can be contracted and expanded, allowing the contact radius of the spiral section to vary slightly. This adjustment of the contact radius, based on the size of the tracheal passage, ensures a more precise fit between the electrode catheter and the airway wall, preventing missed spots and improving treatment efficiency. Simultaneously, the spiral electrode catheter wraps around the endoscope tube, integrating the two into one unit. This allows for synchronous operation of the endoscope and electrode catheter; wherever the endoscope is pointed, the electrode catheter can perform ablation treatment without further distance judgment or adjustment, improving operational convenience.

[0021] 2) A spiral groove is provided on the outer side of the endoscope tube tip. A limiting unit can be further installed on the groove to allow the spiral electrode catheter to expand or contract slightly under the restriction of the groove, which greatly improves the control accuracy of the contact radius.

[0022] 3) A transmission structure is provided, which allows the electrode catheter to move relative to the endoscope tube under the drive of the transmission structure. This enables flexible and precise adjustment of the outer diameter of the spiral section of the electrode catheter, ensuring that the outer diameter of the spiral section of the electrode catheter is fixed after adjustment and will not change during ablation or lesion exploration. This avoids damage to the airway wall caused by excessive support due to the increased outer diameter of the electrode.

[0023] 4) A reflective mechanism is incorporated to ensure a clear view of the image outside the spiral electrode during operation, enabling accurate target ablation and preventing missed lesions due to unclear observation. Furthermore, the reflective mechanism's support rod is telescopic, facilitating adjustment of its installation length and allowing for adjustment of the appropriate reflective angle as needed, thus improving its applicability. Simultaneously, the reflective mechanism possesses sufficient structural strength, and the curved reflector plate reduces the impact force on the endoscope tube tip during insertion and treatment. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of Example 1.

[0025] Figure 2 This is a top view of Example 1.

[0026] Figure 3 This is a schematic diagram of the structure of Example 2.

[0027] Figure 4 This is an enlarged schematic diagram of the card slot in Example 2.

[0028] Figure 5 This is a cross-sectional schematic diagram of the endoscope tube in Example 2.

[0029] Figure 6 This is a schematic diagram of the transmission structure in Example 2.

[0030] Figure 7 This is a cross-sectional schematic diagram of the transmission structure in Example 2.

[0031] Figure 8 This is a schematic diagram of the structure of Example 3.

[0032] Figure 9 This is a top view of Example 3.

[0033] Figure 10 This is a schematic diagram of the reflective mechanism in Example 3.

[0034] Figure label:

[0035] 1-Endoscope tube; 11-Imaging channel; 12-Light source channel; 13-Slot; 14-Limiting unit; 15-Mounting hole;

[0036] 2-Electrode conduit; 21-Helical segment;

[0037] 3-Transmission structure; 31-Sleeve; 32-Threaded post; 33-Rotating rod; 34-Limiting block;

[0038] 4-Reflecting mechanism; 41-Reflector; 42-Support rod; Detailed Implementation

[0039] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0040] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0043] Example 1

[0044] like Figure 1 As shown, this embodiment provides a pulsed electric field ablation catheter device, including an endoscope tube 1 and an electrode catheter 2. The distal end of the electrode catheter 2 is a helical segment 21, which is wound around the distal end of the endoscope tube 1, and one end of the helical segment 21 is fixedly connected to the end face of the tip of the endoscope tube 1. A sleeve 31 is provided on the outside of the endoscope tube 1, and the non-helical segment of the electrode catheter 2 passes through the sleeve 31. Thus, when the electrode catheter 2 is pulled or dragged along the axial direction of the sleeve 31, the radius of the helical structure of the helical segment 21 of the electrode catheter 2 changes. When the electrode catheter 2 is pushed upward, the helical segment 21 expands; when the electrode catheter 2 is pulled downward, the helical segment 21 contracts. The expansion and contraction of the helical segment 21 is the expansion and contraction of the contact radius of the electrode catheter 2. In actual operation, adjusting the contact radius according to the size of the tracheal passage can make the electrode catheter 2 fit more closely to the wall of the airway to be treated, avoid leakage, and improve treatment efficiency. At the same time, the spiral segment 21 wraps around the endoscope tube 1, making the two into one, so that the endoscope tube 1 and the electrode catheter 2 are synchronized. That is, wherever the endoscope is pointed, the electrode catheter 2 can perform ablation treatment without the need for distance judgment or adjustment, thus improving the convenience of operation.

[0045] like Figure 2As shown, the endoscope tube 1 adopts a conventional structure, with an imaging channel 11 and a light source channel 12 inside. The imaging channel 11 houses an objective lens and an imaging sensor, used to transmit the image observed by the objective lens to a display via electrical signals. In other embodiments, the imaging channel 11 and the light source channel 12 within the endoscope tube 1 can be arranged in the same channel. Combined with winding the electrode catheter 2 around the outside of the endoscope tube 1, the diameter of the entire device will be greatly reduced, allowing the device to penetrate deeper into the trachea or other passages for treatment.

[0046] In this embodiment, the electrode catheter is connected to a high-voltage generator and control software. The ablation energy emitted by the high-voltage generator passes through the ablation electrode on the spiral segment 21 of electrode channel 2, and combines with the return electrode attached to the body surface to form a pair of electrode channels for targeted treatment of lesions in the trachea inside the lungs. The ablation electrode on spiral segment 21 releases pulsed energy, which is fed back to the control software via electrical signals to precisely control the energy release of the electrodes, releasing corresponding energy for ablation based on the severity of different lesions. Simultaneously, magnetic navigation beacon mapping and endoscopy are used for positioning to ensure precise ablation of the target tissue.

[0047] In another embodiment, a plurality of ablation electrodes are also disposed on the spiral section 21 of the electrode conduit 2, with the ablation electrodes arranged at intervals. The plurality of ablation electrodes on the spiral section 21 form an ablation electrode group, creating a closed-loop annular structure to prevent leakage. The plurality of ablation electrodes are the positive poles of the pulsed electric field, and can be energized individually or together, forming a pulse channel with the return electrode (negative pole) attached to the human body's pulsed electric field for targeted or regional ablation. In specific implementation, the number and density of ablation electrodes are determined by the number of turns of the spiral section 21. When the number of turns of the spiral section 21 is large, the interval between adjacent ablation electrodes is slightly larger; when the number of turns of the spiral section is small, the interval between adjacent ablation electrodes is smaller. As a preferred embodiment, the ablation electrodes are uniformly distributed, with an interval angle of 20°-60°. Optionally, the ablation electrodes can also be non-uniformly distributed, as long as the projection of the ablation electrode on an annular cross-section is a closed annular structure.

[0048] Example 2

[0049] The overall structure of this embodiment is basically the same as that of Embodiment 1, including the endoscope tube 1 and the electrode catheter 2. The difference is that, Figure 3 and Figure 4 As shown, a spiral groove 13 is provided on the outside of the endoscope tube 1, and the spiral section 21 of the electrode catheter 2 is disposed in the groove 13; a transmission structure 3 for operating the electrode catheter 2 is also provided on the outside of the endoscope tube 1.

[0050] The distal end of the electrode conduit 2 is configured with a spiral structure, and a groove 13 matching the spiral segment 21 is formed on the outer surface of the endoscope tube 1, such as... Figure 5 As shown. The spiral segment 21 of the electrode catheter 2 is engaged in the slot 13, and the side of the spiral segment 21 near the endoscope tube tip is fixed to the end face of the endoscope tube 1, so that the fixed end of the spiral segment 21 of the electrode catheter 2 does not move relative to the endoscope tube 1. A limiting unit 14 is also provided on the slot 13. The spiral segment 21 of the electrode catheter 2 passes through the limiting unit 14. When the electrode catheter 2 is displaced relative to the endoscope tube 1, its spiral segment 21 expands or contracts slightly along the slot 13 under the restriction of the limiting unit 14. The specific structure of the limiting unit 14 is not limited. It can be a baffle distributed along the slot 13, with each baffle connecting to both sides of the slot 13 to form an annular limiting channel. The electrode catheter 2 passes through the limiting channel formed by the baffle.

[0051] like Figure 6 and Figure 7 As shown, the transmission structure 3 includes a sleeve 31 and an operating mechanism. The non-fixed end of the helical section 21 of the electrode conduit 2 extends into the sleeve 31 and connects to the operating mechanism, moving axially along the sleeve 31 under the drive of the operating mechanism. Specifically, a threaded groove is provided on the inner wall of the sleeve 31. The operating mechanism includes a threaded post 32 and a rotating rod 33 connected to each other. The threaded post 32 is fitted into the threaded groove in the sleeve 31, and the upper end of the threaded post 32 is movably connected to the electrode conduit 2 extending into the sleeve 31. The non-fixed end of the helical section of the electrode conduit 2 can rotate within the threaded post 32, but it cannot move relative to the electrode conduit 2 in the axial direction. The lower end of the threaded post 32 is fixedly connected to the rotating rod 33. The rotating rod 33 extends from the lower end opening of the sleeve 31 and connects to an external control terminal. Thus, the threaded post 32 and the sleeve 31 form a worm gear structure. By rotating the rotating rod 33, the threaded post 32 can move axially up and down within the sleeve 31. The threaded post 32 drives the electrode conduit 2 to move, thereby causing the helical segment 21 of the electrode conduit 2 to contract or expand along the groove 13 of the helix under the action of the limiting unit 14, thereby adjusting the contact radius of the helical segment 21. Simultaneously, this adjustment method can precisely control the displacement of the helical segment 21 of the electrode conduit 2 by calculating the number of rotations of the rotating rod 33, and the threaded connection has a self-locking function, making the radius of the helical segment 21 of the electrode conduit 2 less prone to change after adjustment.

[0052] In this embodiment, the length of the threaded groove inside the sleeve 31 should satisfy the following: when the threaded post 32 is close to the helical section 21, the helical section 21 of the electrode conduit 2 is in a supported state, and the outer diameter of the helical electrode 21 structure is at its maximum; when the threaded post 32 is close to the threaded groove away from the helical section 21, the helical section 21 of the electrode conduit 2 is in a contracted state and is engaged in the slot 13, and the outer diameter of the helical electrode structure is at its minimum. To avoid damage to the airway wall caused by excessive support due to the increased outer diameter of the electrode, a limiting block 34 is provided at the upper end of the sleeve 31 to limit the maximum upward movement distance of the threaded post 32, and also to prevent the threaded post 32 from exceeding its stroke.

[0053] Example 3

[0054] like Figure 8 As shown, the overall structure of this embodiment is basically the same as that of Embodiment 1, including an endoscope tube 1 and an electrode catheter 2. The difference is that a reflective mechanism 4 is also provided, which is installed at the tip of the endoscope tube 1. The reflective mechanism 4 is used to reflect the light source onto the side wall of the trachea to be ablated, so that the ablation electrode on the spiral segment 21 outside the endoscope tube 1 can accurately find the target for precise ablation; at the same time, the reflective mechanism 4 has a certain structural strength to reduce the impact force on the tip of the endoscope tube 1 during the insertion treatment. The reflective mechanism 4 includes a reflector plate 41 and a support rod 42 connected to the reflector plate 41. The tail end of the support rod 42 is connected to the end face of the tip of the endoscope tube 1, as shown. Figure 9 As shown, a mounting hole 15 is provided on the end face for inserting the support rod 42. The reflector 41 is an arc-shaped plate with its concave surface facing the endoscope tube 1. Optionally, the reflector 41 can also be a flat plate. In order to enable the device to enter deeper layers of the trachea, the outer diameter of the shadow edge of the reflector 41 projected onto the end face of the endoscope tube 1 is not greater than the outer diameter of the endoscope tube 1.

[0055] like Figure 10As shown, the reflector is a certain distance from the front end of the endoscope tube 1, allowing the light source to reflect and illuminate the tracheal sidewall corresponding to the spiral segment 21. The larger the light divergence angle α and the distance L between the reflector 41 and the front end of the endoscope tube 1, the larger the scanning area. However, the light divergence becomes less concentrated, resulting in an unclear image. Furthermore, if L is too large, the strength of the device cannot be guaranteed. Therefore, under the premise of satisfying appropriate distances and angles L and α, it is sufficient to ensure a clear image. The reflector mechanism 4 can be a detachable structure, for example, a reflector mechanism 4 with multiple support rods 42 of different lengths. When needed, a support rod 42 of appropriate length is selected and installed preoperatively according to the required L and α. The support rod 42 and the mounting hole 15 are interference-fitted for easy installation and disassembly. The reflector mechanism 4 can also be a fixed, non-detachable structure, but the support rod 42 adopts a telescopic rod structure. Thus, the length of the support rod 42 can be adjusted according to the required L and α, thereby adjusting the distance between the reflector 41 and the light source at the end of the endoscope to achieve the maximum scanning area, facilitating observation during surgery. As the preferred method, the light source divergence point is located at the geometric center of the endoscope tube 1, and the light can form a 360-degree circular scanning area.

[0056] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A combined pulsed electric field ablation catheter device, characterized in that, include: An endoscope tube (1) has a head end and a tail end, and a light source channel (12) and an imaging channel (11) are provided inside the endoscope tube (1); The electrode conduit (2) has a spiral section (21) and a control end. The spiral section (21) is provided with a plurality of ablation electrodes. The spiral section (21) of the electrode conduit (2) is attached to the outer surface of the head end of the endoscope tube (1) and is axially spirally distributed from the head end to the tail end of the endoscope tube (1). The spiral section (21) is fixedly disposed at the head end of the endoscope tube (1) on the side away from the control end. When the control end of the electrode catheter (2) moves relative to the endoscope tube (1), the spiral section (21) of the electrode catheter (2) can expand or contract along the radial direction of the endoscope tube (1).

2. The combined pulsed electric field ablation catheter device according to claim 1, characterized in that, The endoscope tube (1) has a spiral groove (13) on its outer surface. The shape of the groove (13) is adapted to the shape of the spiral section (21) of the electrode conduit (2). The spiral section (21) of the electrode conduit (2) is located in the groove (13), and part of the spiral section (21) of the electrode conduit (2) is exposed outside the groove (13).

3. The combined pulsed electric field ablation catheter device according to claim 2, characterized in that, The slot (13) is provided with a limiting unit (14) on the side near the control end of the electrode conduit (2), and the spiral section (21) of the electrode conduit (2) passes through the limiting unit (14); when the control end of the electrode conduit (2) is displaced relative to the endoscope tube (1), the limiting unit (14) guides the spiral section (21) of the electrode conduit (2) to expand or contract along the slot (13).

4. The combined pulsed electric field ablation catheter device according to claim 3, characterized in that, The limiting unit (14) is a baffle. The two ends of the baffle are connected to the two sides of the slot (13) to form an annular closed structure with the bottom surface of the slot (13). The spiral section (21) of the electrode conduit (2) passes through the annular closed structure.

5. The combined pulsed electric field ablation catheter device according to claim 1, characterized in that, The endoscope tube (1) is provided with a transmission structure (3) on the outside. The transmission structure (3) includes a sleeve (31) and an operating mechanism. The sleeve (31) is fixedly disposed on the outside of the endoscope tube (1). One side of the spiral section (21) of the electrode conduit (2) extends into the sleeve (31) and is connected to the operating mechanism. Under the drive of the operating mechanism, the spiral section (21) of the electrode conduit (2) moves axially along the sleeve (31).

6. The combined pulsed electric field ablation catheter device according to claim 5, characterized in that, The inner wall of the sleeve (31) is provided with a threaded groove on the side near the electrode conduit (2). The operating mechanism includes a threaded column (32) and a rotating rod (33) connected to each other. The threaded column (32) is fitted into the threaded groove and is movably connected to the helical section (21) of the electrode conduit (2). The rotating rod (33) extends out of the sleeve (31) and connects to the external operating end.

7. The combined pulsed electric field ablation catheter device according to claim 5, characterized in that, The sleeve (31) is provided with a limiting block (34) on the side near the electrode conduit (2). The limiting block (34) is provided with a through hole. The non-fixed end of the spiral section (21) of the electrode conduit (2) passes through the through hole and is movably connected to the threaded column (32) of the operating mechanism.

8. The combined pulsed electric field ablation catheter device according to claim 1, characterized in that, The endoscope tube (1) has a reflective mechanism (4) on one side of its head end. The reflective mechanism (4) includes a reflector (41) and a support rod (42). One end of the support rod (42) is fixed to the reflector (41), and the other end is connected to the head end of the endoscope tube (1).

9. A combined pulsed electric field ablation catheter device according to claim 8, characterized in that, The support rod (42) is a telescopic rod that can adjust the distance between the reflector (41) and the head end of the endoscope tube (1) so that the light from the light source channel can irradiate the ablation electrode.

10. A combined pulsed electric field ablation catheter device according to claim 8, characterized in that, The reflector (41) is an arc-shaped plate with its concave surface facing the endoscope tube (1). The outer diameter of the projection of the reflector (41) at the head end of the endoscope tube (1) is not greater than the outer diameter of the endoscope tube (1).

11. The combined pulsed electric field ablation catheter device according to claim 1, characterized in that, The number of turns of the spiral section (21) of the ablation catheter is at least greater than one turn, and the ablation electrodes are spaced apart on the spiral section (21) of the ablation catheter to form an ablation electrode group with a ring structure.

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