Ablation electrode catheter

Abstract

The present invention provides an ablation electrode catheter, which includes a guide tube, an electrode and a balloon. The electrode is installed on the guide tube, and is a ring-like structure in a free state. The distal end of the electrode can move along the axial direction of the guide tube to change the radial size of the electrode. The balloon wraps the electrode and can change between a compressed state and an expanded state. When the balloon is in the compressed state, the electrode fits the guide tube. When the balloon is in the expanded state, the distal end of the electrode moves proximally along the axial direction of the guide tube to increase the radial size of the electrode. When the electrode catheter enters the blood vessel, the radial size of the electrode catheter reaches a minimum, which protects the blood vessel and the electrode; when the electrode catheter reaches the target position, the electrode is compressed to increase the radial size of the electrode, and the electrode releases heat to ablate the target area. By cooling the inner wall of the blood vessel by the balloon, it can be avoided that the surface tissue temperature of the target area is too high, which damages the epidermal tissue, and the internal tissue cannot achieve the ablation effect.

Description

Technical Field

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

[0002] Atrial fibrillation is a heart rhythm disorder with uncoordinated atrial electrical activity, which leads to ineffective atrial contraction. Atrial fibrillation can clinically cause various serious diseases such as arrhythmia, stroke, heart failure, and even fatal cardiac embolism.

[0003] The pulmonary veins are the main cause of atrial fibrillation due to the presence of pulmonary vein muscle sleeves. There are colonies of myocardial cells between the inner and outer membranes of the pulmonary veins. Since the cells that form the myocardial sleeves have different origins from the atrial muscles and have different electrophysiological characteristics, they will form an abnormally excited matrix and cause atrial fibrillation.

[0004] The late stage of atrial fibrillation can lead to heart failure, which is an incurable disease and threatens the patient's life at all times. There are many reasons that affect heart failure. Through unilateral ablation of the visceral nerves through catheters, the sympathetic nervous system can be restored to normal, and then the viscera can return to normal contraction, so that the blood in the human body can be redistributed, the cardiopulmonary pressure can be normalized, and finally the symptoms of heart failure can be reduced. A new method for treating heart failure has been developed. During the process of nerve treatment, the inner wall is protected and more effective content is delivered to the nerves on the outer wall of the blood vessel.

[0005] Catheter radiofrequency ablation has gained more clinical applications due to its simple structure and easy operation. Catheter radiofrequency ablation involves puncturing a blood vessel, inserting an electrode catheter into the femoral vein and reaching the target blood vessel, and then releasing high-frequency current locally there, generating very high temperatures in a very small range. Through thermal efficiency, the moisture in the local tissue evaporates, causing dry necrosis, and achieving the purpose of treatment. However, during catheter radiofrequency ablation, on the one hand, the electrode catheter is prone to accumulation due to excessive resistance during delivery, affecting delivery and easily damaging the electrode; on the other hand, the high temperature of the electrode catheter can cause damage to surrounding tissues during the ablation process, and there may be problems with incomplete ablation due to the deep location of some lesions. Summary of the invention

[0006] The purpose of the present application is to provide an ablation electrode catheter. Specifically, the ablation electrode catheter can protect blood vessels and electrodes during the movement of the electrode catheter by wrapping the electrode with a balloon and combining it with an electrode with a changeable radial size, and can also protect blood vessels by cooling the inner wall of the blood vessel by the balloon during treatment.

[0007] To achieve the above object, the present invention provides the following technical solution.

[0008] The present invention provides an ablation electrode catheter, which includes a guide tube, an electrode and a balloon. The electrode is mounted on the guide tube and is a ring-like structure in a free state. The distal end of the electrode can move axially along the guide tube to change the radial size of the electrode. The balloon wraps the electrode, and the balloon has an opening for fluid to enter and / or discharge; the balloon is in a compressed state when there is no fluid, and is in an expanded state when filled with fluid. The balloon can change between a compressed state and an expanded state. When the balloon is in the compressed state, the electrode is attached to the guide tube. When the balloon is in the expanded state, the distal end of the electrode moves proximally along the axial direction of the guide tube to increase the radial size of the electrode.

[0009] Preferably, the guide tube includes a core tube; an outer tube, wherein the outer tube is sleeved on the core tube, the core tube is located in the balloon, and the portion extending out of the outer tube forms an electrode mounting section; a guide ring, wherein the guide ring is sleeved on the electrode mounting section, the guide ring can slide along the electrode mounting section, and the two ends of the electrode are respectively connected to the guide ring and the end face of the outer tube.

[0010] Preferably, the guide ring is provided with a plurality of curved sections along the circumferential direction.

[0011] Preferably, the top end of the curved section is an arc-shaped surface.

[0012] Preferably, the guide ring is provided with a first connecting ring, and the end of the electrode is provided with a second connecting ring; the second connecting ring is buckled with the first connecting ring to connect the guide ring with the electrode.

[0013] Preferably, the guide ring is provided with a disconnected interface groove, and the second connecting ring is passed through the interface groove to the guide ring.

[0014] Preferably, the core tube is provided with a guide hole which penetrates the core tube radially; the ablation electrode catheter also includes a handle and a pull wire, the handle is located at the end of the core tube away from the electrode, one end of the pull wire is fixed to the guide ring, the pull wire passes through the guide hole and enters the core tube, the pull wire extends along the axial direction of the core tube to be connected to the handle, and the handle can pull the pull wire to make the guide ring slide along the electrode mounting section.

[0015] Preferably, the end of the guide tube away from the balloon forms a handheld portion, the end of the balloon facing the handheld portion forms an inlet tube, the inlet tube is sleeved on the guide tube, and the opening of the balloon is formed between the inlet tube and the guide tube.

[0016] Preferably, the opening of the balloon includes an inlet and an outlet which are independent of each other, and the inlet and the outlet are connected to the internal space of the balloon, the inlet is used for fluid to enter, and the outlet is used for fluid to discharge.

[0017] Preferably, the balloon includes a balloon body and support covers located at both ends of the balloon body, the inner surface of the support cover forms an acute angle with the central axis of the guide tube, the support cover is made of non-deformable material, and the balloon body is made of deformable material.

[0018] Preferably, the angle between the inner circumferential surface of the support cover and the central axis of the guide tube is no greater than 45°.

[0019] Preferably, the thickness of the balloon body gradually decreases in a direction away from the support cover.

[0020] Preferably, the balloon body includes a middle section and slope sections located at both ends of the middle section, the middle section is a cylinder with the same diameter, the diameter of the middle section is larger than the maximum diameter of the support cover, and the slope section connects the annular end surface of the middle section with the outer edge of the support cover.

[0021] Preferably, the outer peripheral surface of the balloon body has folding lines, and the balloon body is folded into a plurality of folds when in a compressed and gripped state, and the folds are arranged around the circumference of the guide tube.

[0022] Preferably, when the electrode is in a free state, its periphery is in contact with the inner wall of the balloon.

[0023] Preferably, the electrode is a spiral ascending structure, the ascending angle between two adjacent layers is α, and 5°≤α≤10°.

[0024] Preferably, the number of spiral turns of the electrode is 1-3 turns.

[0025] Compared with the prior art, the beneficial effects of the present application are: when the ablation electrode catheter described in this article enters a blood vessel, the electrode is wrapped by the balloon and is in a stretched state, so the radial dimension of the electrode catheter is minimized, thereby protecting the blood vessel while also protecting the electrode; when the electrode catheter reaches the target position, the electrode is compressed to increase the radial dimension of the electrode, and the electrode releases heat to ablate the target area. By cooling the inner wall of the blood vessel by the balloon, the surface tissue temperature of the target area can be avoided to be too high, thereby damaging the epidermal tissue and failing to achieve the ablation effect on the internal tissue. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The technical features and advantages of the present invention will be more fully understood by referring to the following detailed description in conjunction with the accompanying drawings.

[0027] Figure 1A three-dimensional schematic diagram showing the balloon of the ablation electrode catheter in an expanded state.

[0028] Figure 2 Display as Figure 1 A partial enlarged view of area A in the middle.

[0029] Figure 3 Display as Figure 1 A schematic cross-sectional view of an ablation electrode catheter is shown.

[0030] Figure 4 Display as Figure 3 A partial enlarged view of area B in the middle.

[0031] Figure 5 Display as Figure 3 A partial enlarged view of area C in the middle.

[0032] Figure 6 A schematic cross-sectional view showing the balloon of the ablation electrode catheter in a compressed state.

[0033] Figure 7 Display as Figure 6 Schematic diagram of the balloon in the middle area D in the compressed state

[0034] Figure 8 Display as Figure 7 Schematic diagram of the electrode status when the ablation electrode catheter is in a compressed and gripped state.

[0035] Fig. 9 Display as Figure 8 A partial enlarged view of area E in the middle.

[0036] Fig.10 Display as Figure 8 Schematic diagram of the structure of the guide ring of the ablation electrode catheter.

[0037] Fig.11 The structure diagram shows the electrode in the free state.

[0038] Fig.12 for Fig.11 main view.

[0039] Description of Reference Numerals

[0040] Guide tube 1

[0041] Head 11

[0042] Core tube 12

[0043] Electrode installation section 121

[0044] Outer tube 13

[0045] Guide ring 14

[0046] Curved section 141

[0047] Curved surface 142

[0048] First connecting ring 143

[0049] Interface slot 144

[0050] Electrode 2

[0051] Second connecting ring 21

[0052] Balloon 3

[0053] Opening 31

[0054] Import 311

[0055] Exit 312

[0056] Inlet pipe 32

[0057] Balloon body 33

[0058] Middle section 331

[0059] Slope section 332

[0060] Folding 333

[0061] Support cover 34 DETAILED DESCRIPTION

[0062] Unless otherwise defined, technical or scientific terms used in the present specification and claims shall have the common meanings understood by persons having ordinary skills in the technical field to which the present invention belongs.

[0063] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 invention.

[0064] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0065] In addition, the “proximal end” refers to the operating end where the operator is located, and the “distal end” refers to the other end opposite to the operating end.

[0066] Figures 1 to 10 The figure shows an embodiment of the ablation electrode catheter of the present invention. The ablation electrode catheter comprises a guide tube 1, an electrode 2 and a balloon 3. The electrode 2 is mounted on the head 11 of the guide tube 1 and is a ring-like structure in a free state. The distal end of the electrode 2 can move axially along the guide tube 1 to change the radial size of the electrode 2. The balloon 3 wraps the electrode 2, and the balloon 3 has an opening 31 for fluid to enter and / or discharge; the balloon 3 is in a compressed state when there is no fluid, and the balloon 3 is in an expanded state when filled with fluid; the balloon 3 can change between the compressed state and the expanded state, and the electrode 2 is attached to the guide tube 1 when the balloon 3 is in the compressed state, and the distal end of the electrode 2 moves proximally along the axial direction of the guide tube 1 when the balloon 3 is in the expanded state, thereby increasing the radial size of the electrode 2.

[0067] Taking one usage mode as an example, when the electrode catheter enters the right atrium from the right femoral vein through the inferior vena cava, punctures the atrial septum and enters the left atrium, during the delivery process, the balloon 3 is in a compressed state (such as Figure 6 As shown in FIG. 1 , the electrode 2 can be attached to the guide tube 1, and the balloon 3 is as close to the electrode 2 as possible, so that the radial dimension of the electrode catheter is minimized to facilitate transportation.

[0068] When the electrode catheter reaches the target area, such as the pulmonary vein orifice, the balloon 3 is filled with fluid (such as saline or saline with contrast agent) from the opening 31, and the balloon 3 is opened to an expanded state (such as Figure 3 As shown), the distal end of the electrode is pulled back at the same time, and the distal end of the electrode 2 moves proximally along the axial direction of the guide tube 1 so as to increase the radial size of the electrode 2. In a preferred embodiment, at least one circle of the outer periphery of the electrode 2 is in contact with the inner wall of the balloon 3. If the electrode 2 and the inner wall of the balloon 3 cannot be well in contact, the electrode 2 can be further pulled back to adjust the outer radial size of the electrode 2. When the outer periphery of the electrode 2 pair is completely in contact with the balloon 3, the power is turned on, and current is passed through the electrode 2 to perform radiofrequency ablation on the tissue at the pulmonary vein orifice. By cooling the pulmonary vein orifice by the balloon 3, the local temperature of the tissue surface can be reduced, thereby avoiding the phenomenon that the surface tissue temperature of the target area is too high and the internal tissue cannot achieve the ablation effect.

[0069] A specific structure in which the distal end of the electrode 2 moves toward the proximal end along the axial direction of the guide tube 1 so as to increase the radial dimension of the electrode 2 is as follows: Figure 6 and Figure 8As shown. The guide tube 1 includes a central tube 12, an outer tube 13 and a guide ring 14. The outer tube 13 is sleeved on the central tube 12. The central tube 12 is located in the balloon 3, and the portion extending out of the outer tube 13 forms an electrode mounting section 121. The guide ring 14 is sleeved on the electrode mounting section 121. The guide ring 14 can slide along the electrode mounting section 121. The two ends of the electrode 2 are respectively connected to the end faces of the guide ring 14 and the outer tube 13. When the guide ring 14 moves on the electrode mounting section 121, when the guide ring 14 moves to the farthest point away from the outer tube 13, the electrode 2 is attached to the electrode mounting section 121; and when the guide ring 14 moves in the direction close to the outer tube 13, the electrode 2 is compressed along the axial direction of the guide tube 1, thereby expanding to form a ring with a larger radial size.

[0070] like Figure 8 and Fig. 9 As shown, the guide ring 14 is provided with a plurality of curved sections 141 along the circumferential direction, which are spirally wound around the outer circumference of the central core tube 11, that is, the guide ring 14 is a circular ring surrounded by a plurality of W-shaped or S-shaped structures connected in sequence. When the guide ring 14 moves along the axial direction of the electrode mounting section 121, the contact area with the electrode mounting section 121 can be increased, so that the axial movement of the guide ring 14 is more stable. In order to avoid puncturing the inner wall of the balloon 3, the top of the curved section 141 is an arc-shaped surface 142.

[0071] like Fig. 9 and Fig.10 As shown, the guide ring 14 is provided with a first connecting ring 143, and the end of the electrode 2 is provided with a second connecting ring 21; the second connecting ring 21 is interlocked with the first connecting ring 143, so that the guide ring 14 is connected to the electrode 2. In order to facilitate the connection between the electrode 2 and the guide ring 14, the guide ring 14 is provided with a disconnected interface groove 144, and the second connecting ring 21 is passed through the interface groove 144 to the guide ring 14.

[0072] The movement of the guide ring 14 is controlled by a pull wire. Specifically, the core tube 12 is provided with a guide hole (not shown in the figure) that penetrates the core tube 12 in the radial direction; the ablation electrode catheter also includes a handle and a pull wire, the handle is located at the end of the core tube 12 away from the electrode 2, one end of the pull wire is fixed to the guide ring 14, the pull wire passes through the guide hole and enters the core tube 12, the pull wire extends along the axial direction of the core tube 11 to connect with the handle, and the handle can pull the pull wire to make the guide ring 14 slide along the electrode mounting section 121.

[0073] like Figures 1 to 3As shown, the end of the guide tube 1 away from the head 11 forms a hand-held portion, and the end of the balloon 3 facing the hand-held portion forms an inlet tube 32, which is sleeved on the guide tube 1, and an opening 31 of the balloon 3 is formed between the inlet tube 32 and the guide tube 1. The opening 31 is connected to a delivery pipe for conveying fluid, and the opening of the delivery pipe extends to the hand-held portion. When the electrode catheter is inserted into a blood vessel, the opening of the delivery pipe is located outside the human body. The fluid is input into the balloon 3 through the opening of the delivery pipe, and then discharged from the delivery pipe to the outside of the human body. In other embodiments, the outlet of the delivery pipe is provided with a pressure valve to maintain a certain pressure in the balloon.

[0074] The fluid filled is preferably cold saline, which circulates in the balloon 3 to keep the balloon 3 at a relatively low temperature during the treatment process, thereby protecting the inner wall of the blood vessel. Of course, in other embodiments, the fluid may also be other liquids, and any fluid that can keep the balloon 3 at a relatively low temperature may be applicable.

[0075] In order to ensure that the fluid in the balloon 3 can circulate smoothly, the opening 31 of the balloon 3 includes an independent inlet 311 and an outlet 312. The inlet 311 and the outlet 312 are connected to the internal space of the balloon 3. The inlet 311 is used for fluid entry, and the outlet 312 is used for fluid discharge. Correspondingly, two delivery pipes are also provided. The two delivery pipes are an input pipe and an output pipe, respectively. The input pipe is connected to the inlet 311, and the output pipe is connected to the outlet 312. The input pipe is used to input fluid, and the output pipe is used to output fluid. By independently providing the input pipe and the output pipe, it can be ensured that the fluid in the balloon 3 can circulate smoothly.

[0076] Among them, a specific structure of the balloon 3 is as follows Figures 3 to 5 As shown. The balloon 3 includes a balloon body 33 and support covers 34 located at both ends of the balloon body 33. The inner surface of the support cover 34 forms an acute angle with the central axis of the guide tube 1. The support cover 34 is made of a non-deformable material, and the balloon body 33 is made of a deformable material. The hardness of the support cover 34 material is greater than the hardness of the balloon body 33 material. Both can be made of polymer materials. By setting the support covers 34 at both ends of the balloon body 33, when the balloon 3 is compressed to a compressed state, the balloon 3 still has a certain support force and will not press the electrode 2, thereby protecting the electrode 2.

[0077] The angle between the inner circumference of the support cover 34 and the central axis of the guide tube 1 is preferably no greater than 45°, so that the support cover 34 can maintain a better tilt angle, making the process of the electrode catheter entering the blood vessel smoother.

[0078] In order to facilitate the compression of the balloon body 33 , the thickness of the balloon body 33 gradually decreases in the direction away from the support cover 34 , that is, the thickness in the middle of the balloon body 33 is the thinnest, and the thickness near the edge of the support cover 34 is the thickest.

[0079] A specific structure of the balloon body 33 is as follows Figure 3 As shown. The balloon body 33 includes a middle section 331 and slope sections 332 located at both ends of the middle section 331. The middle section 331 is a cylinder with the same diameter. The diameter of the middle section 331 is larger than the maximum diameter of the support cover 34. The slope section 332 connects the annular end surface of the middle section 331 and the outer edge of the support cover 34. Part of the middle section 331 is used to fit the blood vessel in the expanded state and form a space for releasing the electrode 2. The middle section 331 is designed to be cylindrical, which can better fit the blood vessel, and the slope section 332 ensures a smooth transition between the middle section 331 and the support cover 34.

[0080] like Figure 7 As shown, the outer peripheral surface of the balloon body 33 has folding lines. The balloon body 33 is folded into a plurality of folds 333 when in a compressed and gripped state. The folds 333 are arranged around the circumference of the guide tube 1 .

[0081] In other embodiments, Fig.11 , 12 As shown, the electrode 2 is a 2-layer spiral ascending structure, and a plurality of electrode heads 221 are provided on the annular electrode 2, and the electrode heads 221 are arranged alternately as positive and negative electrodes. Between adjacent layers, the electrode rise angle α=5°, and in other embodiments, multiple layers of electrodes may also be provided, such as 3 layers, and in order to avoid short circuits caused by conduction between the positive and negative electrodes between the layers, the rise angle of the annular electrode 2 may also be increased, such as increased to 6°, 7°, 8°, 9°, 10°, etc.

[0082] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be connected, detachably connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, and it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0083] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An ablation electrode catheter, characterized in that: include: Guide tube; An electrode, the electrode is mounted on the guide tube and is a ring-like structure in a free state, and the distal end of the electrode can move axially along the guide tube to change the radial size of the electrode; A balloon, the balloon wraps the electrode, the balloon having an opening for fluid to enter and / or discharge; the balloon is in a compressed state when there is no fluid, and is in an expanded state when filled with fluid; The balloon can be changed between a compressed state and an expanded state. When the balloon is in the compressed state, the electrode is attached to the guide tube. When the balloon is in the expanded state, the distal end of the electrode moves toward the proximal end along the axial direction of the guide tube so that the radial size of the electrode increases. The guide tube comprises: Center core tube; An outer tube, the outer tube is sleeved on the central tube, the central tube is located in the balloon, and the portion extending out of the outer tube forms an electrode installation section; A guide ring is sleeved on the electrode mounting section, the guide ring can slide along the electrode mounting section, and the two ends of the electrode are respectively connected to the guide ring and the end surface of the outer tube.

2. The ablation electrode catheter according to claim 1, characterized in that: The guide ring is provided with a plurality of curved sections along the circumferential direction.

3. The ablation electrode catheter according to claim 2, characterized in that: The top end of the curved section is an arc-shaped surface.

4. The ablation electrode catheter according to claim 1, characterized in that: The guide ring is provided with a first connecting ring, and the end of the electrode is provided with a second connecting ring; the second connecting ring is buckled with the first connecting ring to connect the guide ring with the electrode.

5. The ablation electrode catheter according to claim 4, characterized in that: The guide ring is provided with a disconnected interface groove, and the second connecting ring is passed through the interface groove to the guide ring.

6. The ablation electrode catheter according to claim 1, characterized in that: The core tube is provided with a guide hole which penetrates the core tube radially; the ablation electrode catheter also includes a handle and a pull wire, the handle is located at the end of the core tube away from the electrode, one end of the pull wire is fixed to the guide ring, the pull wire passes through the guide hole and enters the core tube, the pull wire extends along the axial direction of the core tube to be connected to the handle, and the handle can pull the pull wire to make the guide ring slide along the electrode mounting section.

7. The ablation electrode catheter according to claim 1, characterized in that: One end of the guide tube away from the balloon forms a handheld portion, and one end of the balloon facing the handheld portion forms an inlet tube, which is sleeved on the guide tube, and an opening of the balloon is formed between the inlet tube and the guide tube.

8. The ablation electrode catheter according to claim 1 or 7, characterized in that: The opening of the balloon includes an inlet and an outlet that are independent of each other. The inlet and the outlet are connected to the internal space of the balloon. The inlet is used for fluid to enter, and the outlet is used for fluid to discharge.

9. The ablation electrode catheter according to claim 1, characterized in that: The balloon comprises a balloon body and support covers located at both ends of the balloon body, the inner surface of the support cover forms an acute angle with the central axis of the guide tube, the support cover is made of non-deformable material, and the balloon body is made of deformable material.

10. The ablation electrode catheter according to claim 9, characterized in that: The angle between the inner circumferential surface of the support cover and the central axis of the guide tube is no greater than 45°.

11. The ablation electrode catheter according to claim 9, characterized in that: The thickness of the balloon body gradually decreases in a direction away from the support cover.

12. The ablation electrode catheter according to claim 9, characterized in that: The balloon body includes a middle section and slope sections located at both ends of the middle section. The middle section is a cylinder with the same diameter. The diameter of the middle section is larger than the maximum diameter of the support cover. The slope section connects the annular end surface of the middle section and the outer edge of the support cover.

13. The ablation electrode catheter according to any one of claims 9 to 12, characterized in that: The outer peripheral surface of the balloon body has folding lines. The balloon body is folded into a plurality of folds when in a compressed and gripped state. The folds are arranged around the circumference of the guide tube.

14. The ablation electrode catheter according to claim 1, characterized in that: When the electrode is in a free state, its periphery is in contact with the inner wall of the balloon.

15. The ablation electrode catheter according to claim 14, characterized in that: The electrode is a spiral ascending structure, the ascending angle between two adjacent layers is α, and 5°≤α≤10°.

16. The ablation electrode catheter according to claim 15, characterized in that: The number of spiral turns of the electrode is 1-3 turns.

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