Ablation device

Abstract

The utility model relates to an ablation device. The ablation device comprises an outer tube, an inner tube, an end head, at least two electrode arms and an optical fiber, one end of the inner pipe extends into the outer pipe, and the inner pipe moves in the axial direction of the outer pipe; the end is connected with one end of the inner pipe away from the outer pipe; the electrode arm comprises a main rod, two supporting rods and a plurality of electrode rings, one end of the main rod is connected with the outer pipe, the other end of the main rod is connected with one ends of the two supporting rods, and the ends, away from the main rod, of the supporting rods are connected with the end socket; the supporting rods are provided with connecting points, and in every two adjacent electrode arms, the supporting rod of one electrode arm is connected with the supporting rod of the other electrode arm through the corresponding connecting point; one, two or more of the main rod and the supporting rod are sleeved with the electrode ring; the optical fiber is located in the main rod and the supporting rod and provided with a plurality of gratings, and the gratings are located in the electrode arms. According to the scheme provided by the invention, the three-dimensional posture of the electrode arm can be known in real time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an ablation device. BACKGROUND

[0002] Pulse electric field ablation is to place the electrode arm in the pulmonary vein vestibule, and release the pulse voltage controlled by the pulse electric field ablation instrument to make the myocardial cell tissue produce irreversible electroporation phenomenon, so as to ablate the local cardiac tissue and block the abnormal conduction path of the cardiac electrical signal, so as to achieve the purpose of treating arrhythmia.

[0003] During the operation, the posture of the ablation electrode in the atrium and the degree of the electrode arm adhering to the pulmonary vein vestibule are crucial, and the abnormal posture of the electrode arm, not adhering or insufficient adhering can lead to poor treatment effect, longer operation time and increase the pain of the patient during the treatment. At present, the ablation electrode arm is usually placed in the pulmonary vein vestibule by means of two-dimensional (DSA) or three-dimensional mapping system navigation during the operation. Under the two-dimensional image, the posture of the electrode arm can only be seen in a certain direction of the planar image, which is not intuitive and relies on the experience accumulation of the operator to a great extent. When using the three-dimensional mapping system, the three-dimensional device needs to be added during the operation, and the intracardiac cavity modeling needs to be performed before the ablation, which makes the operation process complex, and the electrode posture details feedback is not necessarily supported. For the electrode arm adhering perception, the impedance detection method is mostly used, which takes the impedance of the electrode arm in the atrial blood as the baseline, detects the impedance of the electrode arm when reaching the predetermined position, and analyzes the electrode arm adhering state by comparison. This method has two defects, one is that it cannot accurately judge whether the adhering requirement is met, and the impedance between the electrode arms may become larger or smaller due to the stress distortion of the electrode arm or the blood tissue wrapping; the other is that this method cannot more intuitively feedback more details of the electrode arm posture to the operator, so as to support the operator to make accurate judgment and adjust the electrode arm posture, so as to obtain better treatment effect. CONTENT OF THE UTILITY MODEL

[0004] In order to solve or partially solve the problems in the related art, the present application provides an ablation device which can realize real-time understanding of the three-dimensional posture of the electrode arm.

[0005] The first aspect of the present application provides an ablation device, which comprises an outer tube, an inner tube, a tip, at least two electrode arms and an optical fiber; one end of the inner tube extends into the outer tube, and the inner tube moves along the axial direction of the outer tube; the tip is connected to the end of the inner tube away from the outer tube; the electrode arm comprises a main rod, two branch rods and a plurality of electrode rings, one end of the main rod is connected to the outer tube, the other end of the main rod is connected to one end of each of the two branch rods, and the end of the branch rod away from the main rod is connected to the tip; the branch rod is provided with a joint, and the branch rod of one of the two adjacent electrode arms is connected to the branch rod of the other electrode arm through the joint; the electrode ring is sleeved on one, two or more of the main rod and the branch rod; the optical fiber is located in the main rod and the branch rod, and a plurality of gratings are provided on the optical fiber, and the gratings are located in the electrode arm.

[0006] Further, the gratings are located in the branch rod.

[0007] Further, the gratings are located in the branch rod between the joint and the main rod.

[0008] Further, the electrode ring comprises a first ring, the first ring is sleeved outside the branch rod, and the first ring is located outside the branch rod between the main rod and the joint.

[0009] Further, the inner tube is driven to expand away from the inner tube or to contract towards the inner tube by sliding relative to the outer tube; when the electrode arm is expanded, the first ring is located at the outermost side of the electrode arm.

[0010] Further, at least two gratings are provided on each branch rod, and the at least two gratings are located on opposite sides of the first ring.

[0011] Further, the electrode ring comprises a second ring, and the second ring is sleeved outside the joint.

[0012] Further, the electrode ring comprises a third ring, and the third ring is sleeved outside the connection between the main rod and the branch rod.

[0013] Further, the cross section of the branch rod is circular or rectangular; and / or

[0014] the cross section of the main rod is elliptical or rectangular; and / or

[0015] the cross section of the electrode ring is circular, elliptical, oblate or rectangular.

[0016] Further, the tip is provided with a developing ring.

[0017] The technical scheme provided by the application can have the following beneficial effects: by connecting the support rods with the end head and the main rod respectively, the inner tube and the end head pull the main rod and the support rod to rotate, so that the electrode arm can be unfolded or folded, and the electrode arm can be unfolded in a directional manner, so as to ensure that the positions of the electrode rings on the electrode arm are relatively stable when unfolded; the optical fiber is arranged in the support rod and the main rod, and the grating is arranged on the optical fiber, when the three-dimensional posture of the electrode arm needs to be understood, the grating can be sent with an optical signal, the three-dimensional posture of the electrode arm can be calculated and simulated by receiving the spectrum of the reflected optical signal, so that the three-dimensional posture of the electrode arm is calculated and simulated, the three-dimensional measurement system does not need to be relied on, the equipment investment in the operation process is reduced, and the operation cost and operation difficulty are reduced; by simulating the three-dimensional posture of the electrode arm, the posture of the electrode arm in the atrium can be displayed in real time, when the electrode arm is attached to the pulmonary vein vestibular tissue, the small deformation of the electrode arm can be perceived, and the surgeon can be displayed in a more intuitive manner, the surgeon can accurately determine the attachment degree of each electrode arm, so that the surgeon can decide whether the posture needs to be adjusted according to the posture of the electrode arm, the use frequency of DSA is reduced, the X-ray exposure time is reduced, and the harm of X-ray to patients and medical staff is reduced.

[0018] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which like reference characters refer to like parts throughout the several views, and in which exemplary embodiments of the present application are shown.

[0020] Figure 1 is a structural schematic diagram of an ablation device shown in the embodiments of the application;

[0021] Figure 2 is a structural schematic diagram of an optical fiber shown in the embodiments of the application;

[0022] Figure 3 is an unfolding schematic diagram of an electrode arm shown in the embodiments of the application.

[0023] The drawings show the following: outer tube 1; inner tube 2; end head 3; electrode arm 4; main rod 41; support rod 42; detection section 421; electrode ring 43; first ring 431; second ring 432; third ring 433; optical fiber 5; grating 51; catheter 6; wire 7 DETAILED DESCRIPTION

[0024] Embodiments of the present application will be described in more detail with reference to the drawings. Although embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present application will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0025] It should be understood that, although the terms "first", "second", "third", etc. can be used in this application to describe various information, these information should not be limited by these terms. These terms are only used to distinguish the same type of information from each other. For example, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information without departing from the scope of the present application. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0026] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0027] Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] To solve the above problems, the present application provides an ablation device which can realize real-time understanding of the three-dimensional posture of the electrode arm.

[0029] The technical solutions of the embodiments of the present application will be described in detail below with reference to the drawings.

[0030] Figure 1 is a structural schematic diagram of the ablation device shown in the embodiments of the present application; Figure 2 is a structural schematic diagram of the optical fiber shown in the embodiments of the present application.

[0031] Referring to Figure 1 andFigure 2 The ablation device comprises an outer tube 1, an inner tube 2, a tip 3, at least two electrode arms 4, a control end and an optical fiber 5. The outer diameter of the inner tube 2 is smaller than the hole diameter of the outer tube 1, one end of the inner tube 2 extends into the outer tube 1, and the inner tube 2 can move relative to the outer tube 1, specifically, the inner tube 2 can move along the axial direction of the outer tube 1 in the outer tube 1. The tip 3 is fixedly connected to the end of the inner tube 2 away from the outer tube 1, and the tip 3 moves with the inner tube 2 when the inner tube 2 moves relative to the outer tube 1.

[0032] Referring to Figure 1 Each of the electrode arms 4 comprises a main rod 41, two branch rods 42 and a plurality of electrode rings 43. One end of the main rod 41 is connected to the outer tube 1, and the main rod 41 can deflect relative to the outer tube 1, specifically, the main rod 41 can rotate back and forth relative to the outer tube 1 away from the central axis of the outer tube 1. The other end of the main rod 41 is connected to one end of the two branch rods 42 respectively, and the branch rods 42 can deflect relative to the main rod 41. The length of the branch rod 42 is greater than the length of the main rod 41, and the end of the branch rod 42 away from the main rod 41 is connected to the tip 3, and the branch rod 42 can deflect relative to the tip 3. The branch rod 42 is made of elastic material and can be bent. The branch rod 42 is provided with a connecting point, and the branch rod 42 of one of the adjacent two electrode arms 4 is connected to the branch rod 42 of the other electrode arm 4 through the connecting point.

[0033] Figure 3 is a schematic diagram of the unfolding of the electrode arm shown in the embodiment of the present application.

[0034] Referring to Figures 1-3 When the electrode arms 4 are not needed for electrode ablation, the inner tube 2 can be pushed to move away from the outer tube 1, and the tip 3 pulls the branch rod 42, which pulls the main rod 41 to deflect towards the central axis of the outer tube 1, and the branch rod 42 is folded towards the central axis of the outer tube 1 at the same time, and the electrode arms 4 are folded as a whole. When the electrode arms 4 are needed for electrode ablation, the inner tube 2 can be pulled to move towards the outer tube 1, and the tip 3 pulls the branch rod 42 to bend, which pulls the main rod 41 to deflect away from the central axis of the outer tube 1, and the main rod 41 unfolds away from the central axis of the outer tube 1, and the electrode arms 4 unfold as a whole. The electrode rings 43 are sleeved on one, two or more of the main rod 41 and the branch rod 42, and the distribution position of the electrode rings 43 also unfolds when the electrode arms 4 unfold, thereby expanding the area of electrode ablation of the electrode rings 43.

[0035] Referring to Figure 1 and Figure 2The control end is connected with the outer tube 1 and the inner tube 2 respectively, and the control end comprises a handle which can control the movement of the inner tube 2 relative to the outer tube 1. The control end is connected with the electrode ring 43 through the wire 7, the wire 7 can be accommodated in the inner tube 2, the outer tube 1 and the electrode arm 4, and the control end can send the electrical signal to the electrode ring 43 through the wire 7. The ablation device further comprises a catheter 6 which is sleeved on the outer tube 1, and the catheter 6 is used for protecting the outer tube 1.

[0036] Referring to Figures 1-3 The optical fiber 5 is connected with the control end, and the optical fiber 5 is located in the main rod 41 and the branch rod 42. Specifically, there is at least one optical fiber 5 in each branch rod 42. A plurality of gratings 51 are arranged on the optical fiber 5, and the gratings 51 are located in the electrode arm 4. When the main rod 41 or the branch rod 42 is bent and deformed, the gratings 51 located in the electrode arm 4 will also be deformed. When the light signal is reflected by the gratings 51 with different deformations, the spectrum of the light signal will also be different. The control end comprises a light source, a light signal emitting module and a light signal receiving module. The light source sends the light signal to the optical fiber 5 through the light signal emitting module. After the light signal reaches the grating 51 along the optical fiber 5, a periodic diffraction phenomenon is generated, and the reflected part is reflected from the grating 51 to the light signal receiving module along the optical fiber 5. After the control end receives the reflected light signal, the spectrum of the reflected light signal is analyzed, and then the amount of change of the light ray where the grating 51 is located is calculated, and the real-time three-dimensional posture of the electrode arm 4 is calculated and simulated. In this application, the grating 51 is a Bragg grating 51 sensor. The Bragg grating 51 sensor can change the wavelength of the reflected light wave according to the change of the strain. By virtue of the high sensitivity of the spatial resolution of the Bragg grating 51 sensor, when the electrode arm 4 is attached to the pulmonary vein vestibule tissue, the slight deformation of the electrode arm 4 can be perceived. The three-dimensional posture of the electrode arm 4 is obtained by analyzing the software algorithm of the control end, the attachment degree of each electrode arm 4 can be accurately determined, and the three-dimensional model posture is displayed in real time on the ablation instrument user interface connected with the control end, so as to provide more accurate and intuitive attachment information feedback for the operator. By virtue of the high sensitivity and subtle perception ability of the attachment force, the operator can rely on it to complete the best attachment judgment, so that the operation before pulse ablation is more accurate, and the necessary prerequisite for more effective ablation is provided. The method for calculating the amount of strain by changing the wavelength, simulating the change of the optical fiber 5 at the position of the grating 51, and simulating the three-dimensional posture of the electrode arm 4 belongs to the prior art, and the calculation method and the method are not improved and described in detail.

[0037] Referring to Figure 3In some embodiments, the number of electrode arms 4 is four, and the plurality of struts 42 can form a petal shape, so that the electrode rings 43 can form a continuous and uniform electric field, thereby obtaining a uniform and continuous ablation area, and the unfolded electrode arms 4 have enough space to be kept in the same plane, and the struts 42 do not crowd each other, further ensuring a uniform and continuous ablation area. In other embodiments, the number of electrode arms 4 can be three or five.

[0038] The present application can expand or fold the electrode arms 4 by connecting the struts 42 to the end head 3 and the main rod 41 respectively, and rotating the main rod 41 and the struts 42 by pulling the inner tube 2 and the end head 3, so that the electrode arms 4 can be oriented to expand, ensuring that the positions of the electrode rings 43 on the electrode arms 4 are relatively stable when expanded; the optical fiber 5 is arranged in the struts 42 and the main rod 41, and the optical grating 51 is arranged on the optical fiber 5, when the three-dimensional pose of the electrode arms 4 is needed to be understood, a light signal can be sent to the optical grating 51, and the three-dimensional pose of the electrode arms 4 can be calculated and simulated by receiving the spectrum of the reflected light signal, so that the three-dimensional pose of the electrode arms 4 is not dependent on the three-dimensional mapping system, reducing the equipment investment during the operation, reducing the operation cost and the operation difficulty; by simulating the three-dimensional pose of the electrode arms 4, the pose of the electrode arms 4 in the atrium can be displayed in real time, when the electrode arms 4 are attached to the pulmonary vein vestibular tissue, the slight deformation of the electrode arms 4 can be perceived, and the surgeon can be displayed in a more intuitive way, so that the surgeon can accurately determine the attachment degree of each electrode arm 4, so that the surgeon can decide whether to adjust the pose according to the pose of the electrode arms 4, reduce the use frequency of DSA, reduce the X-ray exposure time, and reduce the harm of X-ray to patients and medical staff.

[0039] Referring to Figures 1-3, the grating 51 is located in the support rod 42, and the deformation degree of the support rod 42 is relatively large compared with the deformation degree of the main rod 41 during the unfolding or folding of the electrode arm 4. By arranging the grating 51 on the optical fiber 5 in the support rod 42, the spectrum change of the light signal reflected by the grating 51 is larger when the three-dimensional posture of the electrode arm 4 changes, and the control end can more accurately simulate the three-dimensional posture of the electrode arm 4 after receiving the reflected light signal. In some embodiments, the grating 51 is located in the support rod 42 between the joint and the main rod 41. When the electrode arm 4 is unfolded, the support rod 42 between the joint and the main rod 41 is located at the outermost side of the electrode arm 4, and the support rod 42 between the joint and the main rod 41 is also the largest deformation section. By arranging the grating 51 in the support rod 42 between the joint and the main rod 41, the three-dimensional posture of the electrode arm 4 can be better simulated. Since the grating 51 is implanted in each support rod 42, that is, more gratings 51 are used in the electrode arm 4, the model during subsequent three-dimensional posture reconstruction is more accurate to reflect the real state of the electrode arm 4 in the atrium. After completing the three-dimensional reconstruction of the electrode arm 4, the operation system connected to the control end can automatically judge whether the electrode arm 4 reaches the optimal position according to the algorithm analysis result, prompt information is given to the operator or the pulse ablation control system is directly notified, and the pulse electric field ablation operation is automatically performed. The operation system has higher automation and intelligence.

[0040] Referring to Figure 2 and Figure 3 , the electrode ring 43 includes a first ring 431, the first ring 431 is sleeved outside the support rod 42, and the first ring 431 is located outside the support rod 42 between the main rod 41 and the joint. Since the support rod 42 between the joint and the main rod 41 is located at the outermost side of the electrode arm 4 when the electrode arm 4 is unfolded, the first ring 431 is arranged outside the support rod 42 between the joint and the main rod 41, so that the first ring 431 can be kept on the outside of the electrode arm 4 as much as possible when the electrode arm 4 is unfolded. Preferably, the inner tube 2 slides relative to the outer tube 1, thereby driving the electrode arm 4 to unfold in a direction away from the inner tube 2 or to contract towards the inner tube 2; when the electrode arm 4 is unfolded, the first ring 431 is located at the outermost side of the electrode arm 4, so that the first ring 431 can maximize the ablation area.

[0041] Referring to Figures 1-3At least two gratings 51 are arranged on each strut 42, and the at least two gratings 51 are respectively arranged on opposite sides of the first ring 431. When the electrode arm 4 is unfolded, the deformation of the strut 42 on the opposite sides of the first ring 431 is relatively large. By arranging the gratings 51 on the outer sides of the strut 42 on the opposite sides of the first ring 431, the three-dimensional posture of the electrode arm 4 can be better simulated. In addition, by arranging the gratings 51 on the outer sides of the strut 42 on the opposite sides of the first ring 431, the real-time three-dimensional posture of the entire electrode arm 4 can be completely simulated. Each strut 42 is provided with two detection sections 421, and the two detection sections 421 are respectively arranged on opposite sides of the first ring 431. The gratings 51 are correspondingly arranged in the detection sections 421.

[0042] Referring to Figure 3 The electrode ring 43 comprises a second ring 432, and the second ring 432 is sleeved outside the joint. Each joint corresponds to one second ring 432. By sleeving the second ring 432 outside the joint, the ablation area of the electrode can be increased. When the electrode arm 4 is unfolded, the second ring 432 surrounds the central axis of the outer tube 1 to form a circle, thereby ensuring a uniform and continuous ablation area. The electrode ring 43 comprises a third ring 433, and the third ring 433 is sleeved outside the connection between the main rod 41 and the strut 42. By sleeving the third ring 433 outside the connection between the main rod 41 and the strut 42, the ablation area of the electrode can be increased. When the electrode arm 4 is unfolded, the third ring 433 surrounds the central axis of the outer tube 1 to form a circle, and the distance between the third ring 433 and the outer tube 1 is the same as the distance between the second ring 432 and the outer tube 1. The second ring 432 cooperates with the third ring 433 to form a circle outside the outer tube 1, so that the ablation area is more uniform, and the ablation effect is more stable.

[0043] Referring to Figures 1-3 In some embodiments, the cross section of the strut 42 is circular or rectangular. In some embodiments, the cross section of the main rod 41 is elliptical or rectangular. The elliptical or rectangular main rod 41 can provide good support, so that the electrode arm 4 can be stably unfolded in the radial direction of the outer tube 1, and the main rod 41 does not deviate left and right. At the same time, the electrode arm 4 can form a firm whole after being unfolded, so that the relative positions between the electrode arms 4 remain stable, which is the basis for uniform, stable and continuous ablation area of the electrode ring 43. In some embodiments, the cross section of the electrode ring 43 is circular, elliptical, oblate or rectangular. The electrode ring 43 needs to have good corrosion resistance. The elliptical or circular electrode ring 43 can increase the surface area of the electrode ring 43, thereby increasing the ablation area of the side of the electrode ring 43 facing the outer tube 1, and ensuring the area and continuity of the electric field on the inner side of the electrode ring 43.

[0044] Referring to Figure 1The end 3 can be provided with or without a developing ring. When the end 3 is provided with the developing ring, if the end 3 is in the blood vessel, the position of the end 3 and the electrode arm 4 can be known by taking X-ray of the patient. In some embodiments, the end 3 is fused with the support rod 42. Since the thickness or diameter of the support rod 42 is small, the support rod 42 can rotate relative to the end 3. In some embodiments, the connection between the end 3 and the inner tube 2 is processed by one-time hot melting, and the connection between the outer tube 1 and the main rod 41 is processed by one-time hot melting, thereby reducing the manufacturing process and improving the manufacturing efficiency. Since the thickness or diameter of the main rod 41 is small, and the hardness of the main rod 41 is low, the main rod 41 can deflect relative to the outer tube 1.

[0045] The solutions of the present application have been described in detail above with reference to the accompanying drawings. In the above-described embodiments, the description of each embodiment is focused on respectively, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments. It should also be appreciated by those skilled in the art that the actions and modules involved in the description are not necessarily essential to the present application. In addition, it can be understood that the steps in the method embodiments of the present application can be adjusted, combined and reduced in sequence according to actual needs, and the modules in the device embodiments of the present application can be combined, divided and reduced according to actual needs.

[0046] The above has described various embodiments of the present application. The above description is exemplary and is not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles, practical application or improvement of technology in the market of the embodiments, or to enable other ordinary skilled in the art to understand the embodiments disclosed herein.

Claims

1. An ablation device, characterized by, The utility model relates to a kind of electrode arm, including: Outer tube; Inner tube, one end of the inner tube extends into the outer tube, the inner tube moves along the axial direction of the outer tube; End head, the end head is connected with the end of the inner tube away from the outer tube; At least two electrode arms, the electrode arm includes main rod, two branch rods and multiple electrode rings, one end of the main rod is connected with the outer tube, the other end of the main rod is respectively connected with one end of two branch rods, the end of the branch rod away from the main rod is connected with the end head;The branch rod is provided with a joint point, in two adjacent electrode arms, the branch rod of one of the electrode arms is connected with the branch rod of another electrode arm through the joint point;The electrode ring is sleeved in one, two or more of the main rod and the branch rod; Optical fiber, the optical fiber is located in the main rod and the branch rod, and a plurality of gratings are provided on the optical fiber, and the gratings are located in the electrode arm.

2. The ablation device of claim 1, wherein: The gratings are located in the branch rod.

3. The ablation device of claim 2, wherein: The gratings are located in the branch rod between the joint point and the main rod.

4. The ablation device of claim 1, wherein: The electrode ring includes a first ring, the first ring is sleeved outside the branch rod, and the first ring is located outside the branch rod between the main rod and the joint point.

5. The ablation device of claim 4, wherein: The inner tube is driven to expand away from the inner tube or contract towards the inner tube by sliding relative to the outer tube;When the electrode arm is expanded, the first ring is located at the outermost side of the electrode arm.

6. The ablation device of claim 4, wherein: Each branch rod is provided with at least two gratings, and at least two gratings are located on opposite sides of the first ring.

7. The ablation device of claim 1, wherein: The electrode ring includes a second ring, and the second ring is sleeved outside the joint point.

8. The ablation device of claim 1, wherein: The electrode ring includes a third ring, and the third ring is sleeved outside the connection between the main rod and the branch rod.

9. The ablation device of claim 1, wherein: The cross section of the branch rod is circular or rectangular;And / or The cross section of the main rod is elliptical or rectangular;And / or The cross section of the electrode ring is circular, elliptical, oblate or rectangular.

10. The ablation device of claim 1, wherein: The end head is provided with a developing ring.

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