Retractable ablation electrode

Abstract

A retractable ablation electrode comprises an electrode sheath tube, the tube wall of which is provided with a receiving hole connected to the tube cavity of the electrode sheath tube; an electrode body, the electrode body is connected to the electrode sheath tube, the proximal end and the distal end of the electrode body can approach or move away from each other in the extension direction of the electrode sheath tube, so that the electrode body has a retracted state and a working state that can be switched with each other; when in the retracted state, the electrode body is located in the receiving hole or in the tube cavity; when in the working state, the electrode body extends out of the receiving hole and is arched; and a driving component, the driving component is connected to the electrode body and is used to drive the proximal end and the distal end to approach or move away from each other. The structure of the electrode body is stable and reliable, the position of the electrode body is highly controllable, it can accurately reach the bronchus, and it is not easy to deform during the treatment process, thereby improving the surgical efficiency and the success rate of the operation.

Description

Technical Field

[0001] The present invention relates to the field of medical equipment, and in particular to a retractable ablation electrode. Background Art

[0002] In recent years, the use of radiofrequency ablation technology to treat asthma has gradually been recognized by doctors and patients. The distal end of the bronchial thermoforming catheter is a radiofrequency electrode, which uses heat to thin the hyperplastic airway smooth muscle on the airway wall, thereby reducing the contraction amplitude of the airway during an asthma attack, and at the same time reducing the frequency and severity of asthma attacks.

[0003] Research has found that the existing ablation electrodes have the following disadvantages:

[0004] 1. The electrode adopts pre-shaped technology, that is, after unpacking, the electrode will naturally bulge outward in the radial direction, and the bulge diameter may be larger than the diameter of the working sheath of the bronchoscope. When the electrode enters the human body through the bronchoscope, the electrode and the inner wall of the working sheath of the bronchoscope may contact each other, resulting in mutual damage;

[0005] 2. For bronchi with smaller diameters, the electrodes using pre-shaped technology may damage the bronchial wall during entry, causing bleeding in patients and even complications such as infection. Summary of the invention

[0006] The object of the present invention is to provide a retractable ablation electrode, which can improve the controllability of the position of the electrode body, thereby improving the operation efficiency and the success rate of the operation.

[0007] The embodiment of the present invention is achieved as follows:

[0008] The present invention provides a retractable ablation electrode, comprising:

[0009] An electrode sheath tube, wherein the tube wall of the electrode sheath tube is provided with a receiving hole communicated with the tube cavity of the electrode sheath tube;

[0010] The electrode body is connected to the electrode sheath tube, and the proximal end and the distal end of the electrode body can be close to or away from each other in the extension direction of the electrode sheath tube, so that the electrode body has a mutually switchable contraction state and working state; when in the contraction state, the electrode body is located in the receiving hole or in the lumen; when in the working state, the electrode body extends out of the receiving hole and is arched;

[0011] And a driving component, which is connected to the electrode body and is used for driving the proximal end and the distal end to move closer to or farther from each other.

[0012] In an optional embodiment, the distal end is fixedly connected to the electrode sheath tube, and the proximal end is slidably connected to the electrode sheath tube; the drive assembly is connected to the proximal end to drive the proximal end to move closer to or away from the distal end.

[0013] In an optional embodiment, the width of the receiving hole is equal to the width of the electrode body, wherein the width direction of the receiving hole and the width direction of the electrode body both extend along the circumference of the electrode sheath tube.

[0014] In an optional embodiment, there are multiple storage holes, which are arranged at intervals in the circumferential direction of the electrode sheath; there are multiple electrode bodies, which are all connected to the electrode sheath, and the multiple electrode bodies correspond one-to-one with the multiple storage holes.

[0015] In an optional embodiment, the proximal ends of the plurality of electrode bodies are connected, and the distal ends of the plurality of electrode bodies are connected.

[0016] In an optional embodiment, the retractable ablation electrode further includes a limiter connected to the electrode sheath tube and configured to abut against the electrode body when the electrode body is in a retracted state, so that the electrode body is located in the receiving hole when in a retracted state.

[0017] In an optional embodiment, the drive assembly includes an elastic member and a cable, the elastic member is connected to the electrode body and the cable at the same time, the cable is slidably connected to the electrode sheath, and the cable is used to drive the proximal end and the distal end to move closer to or away from each other through the elastic member.

[0018] In an optional embodiment, the elastic member is configured as a spring or a rubber member.

[0019] In an optional embodiment, the electrode body includes a first section, a second section and a third section connected in sequence, the outer peripheral surfaces of the first section and the third section are both provided with an insulating layer, and the second section is used to contact with and ablate tissue.

[0020] In an optional embodiment, the retractable ablation electrode further includes a flexible main sheath tube, which is connected to the electrode sheath tube.

[0021] The beneficial effects of the embodiments of the present invention are:

[0022] The retractable ablation electrode provided in this embodiment is capable of having the proximal and distal ends of the electrode body approaching or moving away from each other, so that the electrode body has a retracted state and a working state that can be switched between each other. It is assumed that, in the initial state, the electrode body is in a retracted state, at which time, the electrode body is located in the receiving hole or in the lumen. When an ablation operation is required, an endoscope can be used to deliver the ablation electrode to the patient's treatment position, and then the drive assembly is operated to bring the proximal and distal ends closer to each other, and the electrode body is deformed under the action of an external force, so that it extends out of the receiving hole, and the portion of the electrode body extending out of the receiving hole can contact the tissue, so that an ablation operation can be performed. After the operation is completed, the drive assembly is operated again to move the proximal and distal ends away from each other, and the electrode body switches from the working state to the retracted state, which facilitates the adjustment of the ablation electrode position.

[0023] At the same time, when the electrode body needs to switch from the contracted state to the working state, the proximal and distal ends of the electrode body approach each other, and the electrode body gradually forms an arched structure. The electrode body has high structural stability during the process of switching to the working state and when in the working state, so that the electrode body can accurately reach the preset position when switching to the working state, and the position of the electrode body is well controllable, which shortens the time for adjusting the position of the electrode body and improves the efficiency of the operation. Moreover, when the electrode body contacts the inner wall of the trachea for tissue ablation, it is not easy to deform, and the success rate of the operation is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 Schematic diagram of the structure of the retractable ablation electrode according to an embodiment of the present invention (working state);

[0026] Figure 2 Schematic diagram of the exploded structure of the retractable ablation electrode according to an embodiment of the present invention (working state);

[0027] Figure 3 It is a schematic structural diagram of an electrode sheath tube according to an embodiment of the present invention;

[0028] Figure 4 Schematic diagram of the structure of the electrode body of an embodiment of the present invention (working state).

[0029] icon:

[0030] 100-electrode sheath; 110-lumen; 120-storage hole; 130-installation hole; 200-electrode body; 210-first section; 220-second section; 230-third section; 300-driving assembly; 310-elastic member; 320-pull cable; 330-connecting member; 400-buffer body; 500-limiting member; 600-first collecting member; 700-second collecting member. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They 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 position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0035] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] At present, the ablation electrode used to treat asthma includes a sheath and multiple electrode wires located outside the sheath, one end of each electrode wire is located in the sheath, and the other end is a free end located outside the sheath. When in use, the multiple electrode wires are brought into contact with the inner wall of the bronchus to perform an ablation operation. Since the end of the electrode wire located outside the sheath is a free end, the structural stability of the electrode wire is poor when it is outside the sheath, and the position of the electrode wire is difficult to control when it is extended from the sheath, which increases the difficulty of the operation. At the same time, when the electrode wire contacts the inner wall of the bronchus, it is also easy to deform, and the contact position with the inner wall of the bronchus is uncontrollable, which reduces the treatment efficiency and makes the electrode wire easy to be damaged.

[0038] See also Figure 1-Figure 4 In view of this, the present application provides a retractable ablation electrode, the structure of the electrode body 200 is stable and reliable, the position of the electrode body 200 is highly controllable, it can accurately reach the bronchus, and it is not easy to deform during the treatment process, thereby improving the surgical efficiency and the success rate of the operation.

[0039] See also Figure 1 and Figure 2 In this embodiment, the retractable ablation electrode includes:

[0040] The electrode sheath tube 100 has a tube wall provided with a receiving hole 120 communicating with the tube cavity 110 of the electrode sheath tube 100;

[0041] The electrode body 200 is connected to the electrode sheath tube 100. The proximal end and the distal end of the electrode body 200 can be close to or away from each other in the extension direction of the electrode sheath tube 100, so that the electrode body 200 has a mutually switchable contraction state and working state; when in the contraction state, the electrode body 200 is located in the receiving hole 120 or in the lumen 110; when in the working state, the electrode body 200 extends out of the receiving hole 120 and is arched;

[0042] And a driving component 300, which is connected to the electrode body 200 and is used to drive the proximal end and the distal end to move closer to or away from each other.

[0043] The retractable ablation electrode provided in this embodiment has the proximal and distal ends of the electrode body 200 that can be close to or away from each other, so that the electrode body 200 has a retracted state and a working state that can be switched to each other. It is assumed that in the initial state, the electrode body 200 is in a retracted state. At this time, the electrode body 200 is located in the receiving hole 120 or in the lumen 110. The overall structure of the ablation electrode is compact, small in size, and easy to operate. When an ablation operation is required, the ablation electrode can be delivered to the patient's treatment position using an endoscope, and then the driving component 300 is operated to make the proximal and distal ends close to each other. The electrode body 200 is deformed under the action of an external force, and the middle part is bent so that the entire electrode body 200 is common and extends out of the receiving hole 120. The portion of the electrode body 200 extending out of the receiving hole 120 can contact the tissue, so that the ablation operation can be performed. After the operation is completed, the driving component 300 is operated again to make the proximal and distal ends move away from each other, and the electrode body 200 switches from the working state to the retracted state, which is convenient for adjusting the position of the ablation electrode.

[0044] At the same time, when the electrode body 200 needs to switch from the contracted state to the working state, the proximal and distal ends of the electrode body 200 approach each other, and the electrode body 200 gradually forms an arched structure. The electrode body 200 has high structural stability during the process of switching to the working state and when in the working state. At the same time, the electrode body 200 extends out from the storage hole 120, and the storage hole 120 has the function of guiding the electrode body 200, so that the electrode body 200 is not easy to rotate in the circumferential direction of the sheath when switching to the working state. The electrode body 200 can accurately reach the preset position, and the position of the electrode body 200 is highly controllable, which shortens the time for adjusting the position of the electrode body 200 and improves the surgical efficiency; and when the electrode body 200 contacts the inner wall of the trachea for tissue ablation, the electrode body 200 is arched, has high stability, is not easy to deform, and has a high surgical success rate.

[0045] It should be noted that when the retractable ablation electrode is in use, the end close to the operator is the rear end, the end in contact with the patient is the front end, and the end of each component of the ablation electrode close to the front end is the distal end, and the end close to the rear end is the proximal end.

[0046] See also Figure 3In this embodiment, the electrode sheath tube 100 is optionally a cylindrical tube, the proximal end of the electrode sheath tube 100 is an open end, the distal end of the electrode sheath tube 100 is a closed end, and the closed end is provided with a plurality of independent mounting holes 130, the plurality of mounting holes 130 are evenly spaced along the circumference of the electrode sheath tube 100, and the plurality of mounting holes 130 are all connected to the lumen 110 of the electrode sheath tube 100. For example, in this embodiment, the number of mounting holes 130 is four, each mounting hole 130 is a square hole, and the four mounting holes 130 are arranged in a "cross" shape; it should be understood that in other embodiments, the number of mounting holes 130 is not limited to four, and the mounting holes 130 are not limited to square holes. In addition, the closed end of the electrode sheath tube 100 is provided with a buffer body 400, the buffer body 400 is a sphere, the buffer body 400 covers the closed end, and when the electrode sheath tube 100 moves in the bronchus, the buffer body 400 contacts the tissue and is not easy to damage the tissue. The buffer body 400 may be made of elastic polymer material.

[0047] Furthermore, the buffer body 400 and the electrode sheath tube 100 are configured to be detachably connected, which is convenient for assembly and also convenient for pulling out the electrode body 200 from the mounting hole 130 after the buffer body 400 is disassembled.

[0048] Optionally, a plurality of receiving holes 120 are provided on the tube wall between the proximal end and the distal end of the electrode sheath tube 100, each receiving hole 120 is a strip hole, each receiving hole 120 extends along the axis of the electrode sheath tube 100, and each receiving hole 120 has an outer port and an inner port in the radial direction of the electrode sheath tube 100, that is, the outer port is located on the outer tube wall of the electrode sheath tube 100, and the inner port is located on the inner tube wall of the electrode sheath tube 100. The plurality of receiving holes 120 are evenly spaced and arranged in the circumferential direction of the electrode sheath tube 100. Moreover, the number of the receiving holes 120 is equal to the number of the mounting holes 130 and corresponds one to one, and the corresponding receiving holes 120 and mounting holes 130 are used to jointly locate an electrode body 200, that is, in this embodiment, the number of the receiving holes 120 can be four.

[0049] Furthermore, a stopper 500 is provided inside the electrode sheath tube 100, and the stopper 500 is embedded in the tube cavity 110 of the electrode sheath tube 100. The stopper 500 simultaneously blocks at least part of the inner ports of the plurality of receiving holes 120, so that when the electrode body 200 is in the contracted state, the electrode body 200 abuts against the stopper 500, thereby remaining in the state of being located in the receiving hole 120, and will not enter the tube cavity 110 of the electrode sheath tube 100. In this way, when the electrode body 200 switches from the working state to the contracted state, the electrode body 200 will not enter the tube cavity 110 of the electrode sheath tube 100, and the plurality of electrode bodies 200 will not be located in the tube cavity 110 of the electrode sheath tube 100 and squeeze each other, and the electrode body 200 is not easily damaged by squeezing. At the same time, each electrode body 200 is located in the corresponding storage hole 120. When the electrode body 200 switches from the contracted state to the working state, the electrode body 200 bends and protrudes from the storage hole 120 under the action of external force, and there will be no situation where the electrode body 200 contacts the inner tube wall of the electrode sheath tube 100 and cannot be smoothly extended. There will be no interference between the multiple electrode bodies 200, and the operation of switching the state of the electrode body 200 is safe and reliable.

[0050] In other words, if the limit member 500 is not provided, when the electrode body 200 switches to the contracted state, a plurality of electrode bodies 200 may enter the tubular cavity 110 of the electrode sheath tube 100 after passing through the receiving hole 120. The plurality of electrode sheath tubes 100 are all located in the tubular cavity 110. When force is applied to the electrode body 200 to switch it to the working state, since the electrode body 200 is subjected to not only a driving force but also a torque, the electrode body 200 is prone to rotate relative to the electrode sheath tube 100 in the circumferential direction of the electrode sheath tube 100 before entering the receiving hole 120 from the tubular cavity 110, thereby causing the electrode body 200 to contact the inner tube wall of the electrode sheath tube 100, and the electrode body 200 cannot protrude from the receiving hole 120 smoothly, which may cause the electrode body 200 to get stuck.

[0051] In this embodiment, the stopper 500 is optionally a hollow cylinder, the stopper 500 is coaxial with the electrode sheath 100, and the stopper 500 is light in weight, thereby reducing the overall weight of the ablation electrode. Furthermore, the length of the stopper 500 is less than the length of the receiving hole 120, and the stopper 500 is located in the middle of the length direction of the receiving hole 120. The stopper 500 does not need to completely cover the inner port of the receiving hole 120. The stopper 500 is small in size, consumes less materials, and reduces costs.

[0052] In this embodiment, optionally, the electrode body 200 is a square bar, and a plurality of electrode bodies 200 are provided, the proximal ends of the plurality of electrode bodies 200 are connected, and the distal ends of the plurality of electrode bodies 200 are connected. The number of electrode bodies 200 is equal to the number of mounting holes 130 and receiving holes 120. For example, in this embodiment, the number of electrode bodies 200 is four. The four electrode bodies 200 pass through the four mounting holes 130 respectively, and can be received in the corresponding receiving holes 120.

[0053] See also Figure 4 Further, the distal ends of the four electrode bodies 200 are connected to the first collecting piece 600, the first collecting piece 600 is in a "cross" structure, and the distal ends of the four electrode bodies 200 are respectively connected to the four ends of the first collecting piece 600. The proximal ends of the four electrode bodies 200 are connected to the second collecting piece 700, which can be a cylindrical block. The second collecting piece 700 is located in the lumen 110 of the electrode sheath tube 100 and is slidably matched with the electrode sheath tube 100. The proximal ends of the four electrode bodies 200 are plugged into a circular end face of the second collecting piece 700.

[0054] When the four electrode bodies 200 are assembled with the electrode sheath tube 100, the distal ends of the four electrode bodies 200 are first fixedly connected with the first collecting piece 600, and then the proximal ends of the four electrode bodies 200 are respectively passed through the four mounting holes 130, and then the electrode bodies 200 are inserted into the corresponding receiving holes 120, and enter the tube cavity 110 of the electrode sheath tube 100 from the receiving holes 120 after bypassing the stopper 500, and then the proximal ends of the four electrode bodies 200 are fixedly connected with the second collecting piece 700. The driving assembly 300 is connected with the second collecting piece 700, and is used to drive the second collecting piece 700 to slide relative to the electrode sheath tube 100, so as to bend or straighten the four electrode bodies 200.

[0055] Furthermore, each electrode body 200 has the same width as the corresponding receiving hole 120. The width direction of the receiving hole 120 and the width direction of the electrode body 200 both extend along the circumference of the electrode sheath 100. The electrode body 200 has a high degree of matching with the receiving hole 120. When the electrode body 200 is in the receiving hole 120, the electrode body 200 is not easy to shift in the circumferential direction of the electrode sheath 100. That is, the two hole walls of the receiving hole 120 in the circumferential direction of the electrode sheath 100 play a role in limiting the position of the electrode body 200. When the electrode body 200 is bent by the external force of the driving assembly 300 to protrude from the receiving hole 120, the electrode body 200 will not rotate in the circumferential direction of the electrode sheath 100, thereby improving the accuracy of the position of the electrode body 200 and improving the surgical efficiency and the success rate of the surgery.

[0056] Furthermore, the electrode body 200 includes a first section 210, a second section 220, and a third section 230 connected in sequence, and the outer peripheral surfaces of the first section 210 and the third section 230 are both provided with an insulating layer, and the second section 220 is used to contact and ablate tissue, and the energy is concentrated on the second section 220 to improve the ablation efficiency. At the same time, the tissue in contact with the second section 220 is ablated, and the damage to the inner wall of the bronchus is small while satisfying the treatment effect.

[0057] In this embodiment, the drive assembly 300 optionally includes an elastic member 310 and a cable 320, the elastic member 310 is connected to the electrode body 200 and the cable 320 at the same time, the cable 320 is slidably connected to the electrode sheath tube 100, and the cable 320 is used to drive the proximal end and the distal end to move closer to or farther from each other through the elastic member 310. By transmitting the force through the elastic member 310, it is not easy to damage the electrode body 200 in the process of pulling the electrode body 200.

[0058] Furthermore, the driving assembly 300 further includes a connecting member 330, which is a cylinder and is slidably matched with the electrode sheath tube 100. The elastic member 310 is disposed between the connecting member 330 and the second collecting member 700, and is fixedly connected to the connecting member 330 and the second collecting member 700. The cable 320 is connected to the connecting member 330.

[0059] In other embodiments, optionally, the connecting member 330 is fixed in the electrode sheath tube 100 , the pull cable 320 passes through the connecting member 330 and is directly connected to the second collecting member 700 , and the elastic member 310 is disposed between the second collecting member 700 and the connecting member 330 .

[0060] Optionally, the elastic member 310 may be a spring, a spring sheet or a rubber member. It should be understood that when the elastic member 310 is a conductive member, the elastic member 310 can also play a role in transferring current from the cable to the electrode body 200. When the elastic member 310 is a non-conductive member, a conductive structure may be added between the cable and the electrode body 200 to achieve current transmission. That is, the cable 320 and the electrode body 200 may be electrically connected directly through the elastic member 310, or through other conductive structures.

[0061] In this embodiment, the retractable ablation electrode may further include a flexible main sheath (not shown), which is connected to the electrode sheath 100. The main sheath is flexible and can deform according to the bending direction of the bronchus when moving in the bronchus, so that the main sheath can pass through the bronchus smoothly. At the same time, the main sheath and the electrode sheath 100 are manufactured separately, which reduces the difficulty and saves the processing cost.

[0062] The retractable ablation electrode provided in this embodiment has a stable and reliable structure of the electrode body 200, and the position of the electrode body 200 is highly controllable and can accurately reach the bronchus. It is not easy to deform during the treatment process when it is in a working state and in contact with the tissue, thereby improving the surgical efficiency and the success rate of the operation.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A retractable ablation electrode, characterized in that: include: An electrode sheath tube, wherein the tube wall of the electrode sheath tube is provided with a receiving hole communicated with the tube cavity of the electrode sheath tube; An electrode body, wherein the electrode body is connected to the electrode sheath tube, and the proximal end and the distal end of the electrode body can be close to or away from each other in the extension direction of the electrode sheath tube, so that the electrode body has a mutually switchable contraction state and working state; when in the contraction state, the electrode body is located in the receiving hole or in the lumen; when in the working state, the electrode body extends out of the receiving hole and is arched; and a driving assembly, the driving assembly being connected to the electrode body and being used for driving the proximal end and the distal end to move closer to or farther from each other; The distal end is fixedly connected to the electrode sheath tube, and the proximal end is slidably connected to the electrode sheath tube; the driving assembly is connected to the proximal end, and is used to drive the proximal end to approach or move away from the distal end; The driving assembly includes an elastic member and a cable, wherein the elastic member is connected to the electrode body and the cable at the same time, the cable is slidably connected to the electrode sheath tube, and the cable is used to drive the proximal end and the distal end to move closer to or away from each other through the elastic member.

2. The retractable ablation electrode according to claim 1, characterized in that: The retractable ablation electrode further comprises a limiting member, which is connected to the electrode sheath tube and is used for abutting against the electrode body when the electrode body is in the retracted state, so that the electrode body is located in the receiving hole when in the retracted state.

3. The retractable ablation electrode according to claim 1, characterized in that: The width of the receiving hole is equal to the width of the electrode body, wherein the width direction of the receiving hole and the width direction of the electrode body both extend along the circumferential direction of the electrode sheath tube.

4. The retractable ablation electrode according to claim 1, characterized in that: There are multiple receiving holes, which are spaced apart in the circumferential direction of the electrode sheath tube; there are multiple electrode bodies, which are all connected to the electrode sheath tube, and the electrode bodies correspond one-to-one with the receiving holes.

5. The retractable ablation electrode according to claim 4, characterized in that: The proximal ends of the plurality of electrode bodies are connected, and the distal ends of the plurality of electrode bodies are connected.

6. The retractable ablation electrode according to claim 5, characterized in that: The elastic member is configured as a spring or a rubber member.

7. The retractable ablation electrode according to claim 1, characterized in that: The electrode body comprises a first section, a second section and a third section which are connected in sequence. The outer peripheral surfaces of the first section and the third section are both provided with an insulating layer. The second section is used for contacting with tissue and ablating the tissue.

8. The retractable ablation electrode according to claim 1, characterized in that: The retractable ablation electrode further comprises a flexible main sheath tube, wherein the main sheath tube is connected to the electrode sheath tube.

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