Surgical electrode knife

Abstract

This utility model provides a surgical electrode knife, relating to the field of medical device technology. The user drives the energy transmission part to rotate through the operating component. Since the energy transmission part is connected to the electrode assembly, it drives the electrode assembly to rotate together. This allows the operating component to extend or retract the electrode assembly relative to the delivery component, making it convenient for the user to freely change the extension length of the electrode assembly. This alleviates the technical problem in the prior art where the length of the electrode tip in the electrode knife is fixed and the extension length cannot be adjusted.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a surgical electrode knife. Background Technology

[0002] Since its advent, endoscopy has expanded its application from disease diagnosis to treatment, demonstrating significant effectiveness and reliability in the diagnosis and treatment of digestive system diseases. Currently, endoscopic biopsy, endoscopic mucosal resection (EMR), and endoscopic submucosal dissection (ESD) are widely used and are gradually becoming the preferred treatment options in areas such as gastrointestinal bleeding, polyp removal, and early cancer treatment. Among these, high-frequency endoscopic instruments, using a high-frequency electrosurgical unit, enable minimally invasive surgical procedures. They are primarily used to cut the mucosa of internal cavities and precisely dissect tumors within the mucosa, while ensuring that surrounding tissues are not damaged.

[0003] However, traditional electrode tools have significant limitations. Their electrode tip length is fixed and cannot be flexibly adjusted to suit surgical needs, which to some extent affects the convenience and precision of surgical procedures. This technical deficiency urgently needs improvement to further enhance the clinical application and effectiveness of endoscopic surgery. Utility Model Content

[0004] The purpose of this invention is to provide a surgical electrode knife to alleviate the technical problem in the prior art where the length of the electrode tip is fixed and the extension length cannot be adjusted.

[0005] The surgical electrode knife provided by this utility model includes: an operating component, an electrode component, and a delivery component; The operating component is used to connect to the conveying component; The transmission assembly has an energy transfer section; The electrode assembly passes through the end of the conveying assembly away from the operating assembly; The electrode assembly is connected to the energy transmission unit, and the operating component is configured to drive the electrode assembly to rotate along its own axis through the energy transmission unit, so that the electrode assembly can extend or retract relative to the delivery component.

[0006] In an optional implementation, The electrode assembly includes an electrode body; The outer periphery of the electrode body is provided with at least one or more spirally arranged protruding edges, and there is at least one such protruding edge in any angular plane where the axis of the electrode body is located.

[0007] In an optional implementation, The conveying assembly includes a housing body, a connecting joint, and a limiting component; The energy transfer part is disposed inside the outer shell body, and the end of the energy transfer part near the electrode assembly is connected to the connecting connector. The connecting connector is used to connect the energy transfer part and the electrode assembly. The limiting member is disposed at the end of the outer shell body away from the operating component. The electrode body passes through the limiting member, and the inner wall of the limiting member is provided with a threaded section that mates with the protruding edge, so that when the electrode assembly rotates along itself, the electrode assembly can extend and retract relative to the limiting member.

[0008] In an optional implementation, The operating components include a rotating component and a stationary component; The rotating member is used for the energy transmission part to pass through, and the rotating member is connected to the energy transmission part; The fixed member is threadedly connected to the rotating member so that the rotating member can rotate relative to the fixed member.

[0009] In an optional implementation, The rotating component includes a rotating part and a gripping part; The rotating part is threadedly connected to the fixed component, and a first scale line is provided on the outer surface of the rotating part along the axial direction; The gripping part is connected to the end of the rotating part away from the fixing member, and the gripping part and the rotating part form a slot for the end of the fixing member to extend into.

[0010] In an optional implementation, The operating components also include a first injection component; The electrode body is provided with a through hole along the axial direction, the through hole forms an inner cavity, and the energy transmission part has a first liquid injection channel that communicates with the inner cavity. The first injection component is connected to the rotating part, and the first injection component is configured to communicate with the first injection channel to inject liquid into the inner cavity through the first injection channel.

[0011] In an optional implementation, The first injection component includes a fixed connector, a connecting piece, and an external connector; The fixed joint is fixed to the outer wall of the rotating component. The outer wall of the fixed joint extends outward to form a limiting protrusion. The inner wall of the connector is provided with a limiting groove. The limiting protrusion extends into the limiting groove to restrict the connector from moving along the axis relative to the fixed joint. The end of the external connector extends into the connector and is threadedly connected to the connector; The inner wall of the connector extends to form a connector connection portion, which communicates with the external connector and the fixed connector respectively, so as to connect the external connector and the fixed connector.

[0012] In an optional implementation, The fixing component is provided with an energy access part, which is connected to the energy transmission part and is used to transmit energy to the protruding edge through the energy transmission part.

[0013] In an optional implementation, There is a gap between the outer shell and the energy transmission part, forming a second liquid injection channel; The fixing component is provided with a second liquid injection component, which is connected to the second liquid injection channel. The second liquid injection component is used to deliver liquid to the second liquid injection channel. The liquid in the second liquid injection channel washes the outer surface of the electrode body and the protruding edge along the inner wall of the limiting component.

[0014] In an optional implementation, The end of the electrode body away from the delivery assembly has an end cap; The electrode body and the end cap are made of insulating material, and the protruding edge is made of conductive material; The outer surface of the electrode body is provided with a second scale line along the axial direction. In the surgical electrode knife provided in this embodiment, the user drives the energy transmission part to rotate via the operating component. Since the energy transmission part is connected to the electrode assembly, it drives the electrode assembly to rotate together. This allows the operating component to extend or retract the electrode assembly relative to the delivery component, facilitating the user to freely change the extension length of the electrode assembly. This alleviates the technical problem in existing electrode knives where the electrode tip length is fixed and the extension length cannot be adjusted. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the surgical electrode knife provided in an embodiment of the present utility model; Figure 2A three-dimensional structural diagram of the electrode body in the surgical electrode knife provided in this embodiment of the utility model; Figure 3 A front view of the electrode body in the surgical electrode knife provided in this embodiment of the utility model; Figure 4 for Figure 1 Enlarged cross-sectional view of the structure at point A in the middle; Figure 5 This is a cross-sectional view of the operating component in the surgical electrode knife provided in an embodiment of the present invention; Figure 6 for Figure 5 Enlarged cross-sectional view of the structure at point C; Figure 7 for Figure 1 Enlarged cross-sectional view of the structure at point B; Figure 8 A three-dimensional structural schematic diagram of various embodiments of the electrode body in the surgical electrode knife provided in this utility model embodiment; Figure 9 Three-dimensional structural schematic diagrams of two other embodiments of the electrode body in the surgical electrode knife provided in this utility model embodiment; Figure 10 A three-dimensional structural schematic diagram of another embodiment of the electrode body in the surgical electrode knife provided in this utility model embodiment; Figure 11 This is a schematic diagram showing the connection between the spiral and the limiting member in the main body of the surgical electrode knife provided in this embodiment of the utility model.

[0017] Icons: 10-First injection channel; 20-Second injection channel; 100-Operating component; 110-Rotating component; 111-Rotating part; 112-Holding part; 113-Slot; 114-First scale line; 120-Fixing component; 121-Energy access part; 122-Spring; 200-Electrode assembly; 201-Electrode body; 210-Protruding edge; 220-Through hole; 230-End cap; 240-Second scale line; 300-Transportation component; 310-Energy transfer part; 320-Outer shell body; 330-Connecting connector; 340-Limiting component; 350-Outer tube; 400-First injection component; 410-Fixing connector; 411-Limiting protrusion; 420-Connecting component; 421-Connector connection part; 430-External connector; 500-Second injection component. Detailed Implementation

[0018] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0022] like Figure 1 As shown, the surgical electrode knife provided in this embodiment includes: an operating component 100, an electrode assembly 200, and a delivery component 300; the operating component 100 and the delivery component 300; the delivery component 300 has an energy transmission part 310; the electrode assembly 200 is disposed at the end of the delivery component 300 away from the operating component 100, and the electrode assembly 200 can freely extend or retract relative to the delivery component 300; the operating component 100 can drive the energy transmission part 310 to rotate along its own axis. Since the electrode assembly 200 is connected to the energy transmission part 310, the energy transmission part 310 drives the electrode assembly 200 to rotate along its own axis, so that the electrode assembly 200 can extend or retract relative to the delivery component 300.

[0023] The surgical electrode knife provided in this embodiment allows the user to rotate the energy transmission part 310 by operating the component 100. Since the energy transmission part 310 is connected to the electrode assembly 200, it drives the electrode assembly 200 to rotate together. This allows the user to freely change the extension length of the electrode assembly 200 relative to the delivery component 300 by operating the component 100, thus alleviating the technical problem in the prior art where the length of the electrode tip in the electrode knife is fixed and the extension length cannot be adjusted.

[0024] Regarding the structure and shape of the electrode assembly 200, specifically: like Figure 2 , Figure 3 As shown, the electrode assembly 200 includes an electrode body 201. The outer periphery of the electrode body 201 is provided with one or more spirally arranged protruding edges 210, and there is at least one protruding edge 210 in any angle plane where the axis of the electrode body 201 is located, ensuring that there is at least one edge in every angle of the circumferential direction of the electrode body 201, forming a 360-degree circumferential edge structure. During clinical cutting, the edges come into contact with the tissue immediately, the contact area is smaller, the current density is greater, and the cutting efficiency can be improved when the electrode is long or thick.

[0025] A through hole 220 is provided along the axis of the electrode body 201. The through hole 220 is provided through and forms an inner cavity for liquid flow, so as to supply the liquid for injection.

[0026] The end of the electrode body 201 away from the conveying assembly 300 has an end cap 230, wherein the outer diameter of the end cap 230 is larger than the outer diameter of the part where the edge of the electrode body 201 is located, and the outer diameter of the end cap 230 is larger than the aperture of the through hole in the conveying assembly 300 for the electrode body 201 to pass through, thereby preventing the electrode body 201 from being completely retracted into the conveying assembly 300.

[0027] The electrode body 201 and the end cap 230 are made of insulating material, the protruding edge 210 is made of conductive material, and a second scale line 240 is provided on the outer surface of the electrode body 201 along the axial direction. The user can determine the extension length of the electrode body 201 by means of the second scale line 240.

[0028] like Figure 8 As shown, Figure 8 It includes five electrode assemblies 200 with different outer surface structures. The outer surface of the electrode body 201 is generally spiral-shaped, and each has multiple raised edges 210, and as... Figure 11As shown, the spiral can be a spiral on the outer periphery of the electrode body 201 or a spiral on the entire outer periphery. The end face of the electrode body 201 away from the end cap 230 is a non-circular shape with a bend.

[0029] In addition, such as Figure 9 As shown, there are two electrode assemblies 200 with different outer surface structures, both of which have only one raised edge 210. The left one has a constant pitch, while the right one has a non-constant pitch. It should be noted that if a non-constant pitch electrode assembly 200 is selected, the threaded section on the corresponding limiting member 340 must be compatible with it. Preferably, the raised edge 210 adopts a constant pitch structure.

[0030] The surface spiral of the electrode assembly 200 can adopt a segmented structure, for example, Figure 10 As shown, the advantage of the segmented spiral structure is that it can form a linear movement segment, which facilitates quick adjustment of the extension length of the electrode assembly 200.

[0031] Regarding the structure and shape of the conveying assembly 300, specifically: like Figure 4 As shown, the delivery assembly 300 includes a housing body 320, a connecting joint 330, and a limiting member 340; the energy transmission part 310 is disposed inside the housing body 320, and one end of the energy transmission part 310 is connected to one end of the connecting joint 330. The other end of the connecting joint 330 is sleeved on the electrode body 201 and contacts the protruding edge 210 on the electrode body 201, so as to transmit energy to the protruding edge 210. The connecting joint 330 can be specifically configured as a connecting pipe, and the inner wall of the connecting pipe can be connected to the energy transmission part 310 and the electrode body 201 by means of snap-fit ​​or thread.

[0032] The limiting member 340 is located at the end of the outer shell 320 away from the operating component 100. Specifically, the limiting member 340 is configured as a limiting block. The electrode body 201 passes through the limiting member 340, and the inner wall of the limiting member 340 is provided with a threaded section that cooperates with the protruding edge 210, so that when the electrode body 201 rotates along itself, the electrode body 201 can extend and retract relative to the limiting member 340.

[0033] Regarding the structure and shape of the operating component 100, specifically: like Figure 5 As shown, the operating component 100 includes a rotating component 110 and a fixed component 120. The rotating component 110 is sleeved on the energy transmission part 310 and connected to the energy transmission part 310. Specifically, the rotating component 110 has a through hole inside, the energy transmission part 310 is located in the through hole, and the inner wall of the through hole is fixedly connected to the energy transmission part 310, so that the rotation of the rotating component 110 drives the energy transmission part 310 to rotate together.

[0034] The fixed member 120 is threadedly connected to the rotating member 110 so that the rotating member 110 can rotate relative to the fixed member 120.

[0035] The rotating component 110 includes a rotating part 111 and a gripping part 112. The rotating part 111 is threadedly connected to the fixed component 120. The outer surface of the rotating part 111 is provided with a first scale line 114 along the axial direction. The first scale line 114 allows the user to know the extension or retraction length of the rotating part 111 relative to the fixed component 120, and thus know the extension or retraction length of the electrode body 201.

[0036] The gripping part 112 is connected to the end of the rotating part 111 away from the fixing member 120, and the gripping part 112 and the rotating part 111 surround a slot 113. The slot 113 is used for the end of the fixing member 120 to extend into. Specifically, the gripping part 112 is formed by extending a section outward from the outer side of the rotating part 111 and then extending along the axis of the rotating part 111, so that there is a gap between the gripping part 112 and the rotating part 111. This gap forms the slot 113, which ensures that when the gripping part 112 drives the rotating part 111 to rotate, the end of the fixing member 120 can extend into the slot 113. The slot 113 not only provides space for the end of the fixing member 120 to extend into, but also limits the extension length.

[0037] Based on the above, such as Figure 1 , Figure 4 and Figure 5 As shown, in an optional embodiment, the operating component 100 further includes a first injection component 400; the energy transmission part 310 has a first injection channel 10 that communicates with the inner cavity; the first injection component 400 is connected to the rotating part 111, and the first injection component 400 can communicate with the first injection channel 10 to inject liquid into the inner cavity through the first injection channel 10, and then the liquid flows out along the inner cavity, thus playing an injection role.

[0038] In addition, an outer tube 350 may be optionally provided inside the outer shell 320. Since the energy transmission part 310 is a hollow structure, a first liquid injection channel 10 is formed inside, and the energy transmission part 310 needs to be conductive, the energy transmission part 310 is made of metal material, and the outer tube 350 is sleeved on the energy transmission part 310 to wrap and seal the engraved seam on the energy transmission part 310.

[0039] like Figure 6As shown, the first injection component 400 specifically includes a fixed connector 410, a connector 420, and an external connector 430. The fixed connector 410 is fixed to the outer wall of the end of the gripping part 112 away from the rotating part 111, and the fixed connector 410 is located on the axis of the energy transmission part 310. The outer wall of the fixed connector 410 extends outward to form a limiting protrusion 411. The inner wall of the connector 420 is provided with a limiting groove. The limiting protrusion 411 extends into the limiting groove to restrict the connector 420 from moving along the axis relative to the fixed connector 410, so that the fixed connector 410 can rotate freely relative to the connector 420. This allows the rotating component 110 to rotate freely without affecting the injection of the first injection component 400.

[0040] Furthermore, a sealing ring can be installed in the limiting groove to achieve a sealed connection between the limiting protrusion 411 and the limiting groove, preventing liquid from flowing into the limiting groove.

[0041] The external connector 430 is used to connect to an external liquid injection device. The end of the external connector 430 away from the external liquid injection device extends into the connector 420 and is threadedly connected to the connector 420. The inner wall of the connector 420 extends to form a connector connection portion 421. The external connector 430 is sleeved on the connector connection portion 421, and the connector connection portion 421 is connected to the fixed connector 410. The connection between the external connector 430 and the fixed connector 410 can be achieved through the connector connection portion 421.

[0042] In an optional embodiment, the fixing member 120 is provided with an energy access part 121. One end of the energy access part 121 has a connector for connecting to an external energy device, and the other end of the energy access part 121 extends into the fixing member 120 and connects to the energy transmission part 310. The energy access part 121 is used to transmit the energy generated by the external energy device to the energy transmission part 310.

[0043] In addition, such as Figure 7 As shown, the energy access part 121 specifically includes a metal connecting part and a metal spring 122. The metal connecting part has a through hole for the energy transmission part 310 to pass through, and a metal spring 122 with a certain elasticity is provided inside the through hole to ensure that the metal spring 122 can be tightly attached to the energy transmission part 310, thereby ensuring that the energy access part 121 can smoothly transmit energy to the energy transmission part 310.

[0044] In an optional embodiment, there is a gap between the outer shell body 320 and the energy transmission part 310 to form a second liquid injection channel 20; the fixing member 120 is provided with a second liquid injection member 500, which can be configured as a connector. The connector is disposed on the surface of the fixing member 120. External liquid enters into the second liquid injection channel 20 through the second liquid injection member 500. The liquid in the second liquid injection channel 20 washes the outer surface of the electrode body 201 and the protruding edge 210 along the inner wall of the limiting member 340.

[0045] The surgical electrode knife provided by this utility model has the following advantages: 1. The electrode body 201 has multiple spirally arranged raised edges 210 on its outer periphery. These edges make initial contact with the tissue during clinical cutting. Due to the smaller contact area and higher current density, cutting efficiency can be improved even with longer or thicker electrodes. At least one raised edge 210 is present in any angular plane containing the axis of the electrode body 201, ensuring a 360-degree circumference with edge structure. This allows the electrode to effectively cut in any direction, improving the uniformity and consistency of the cutting.

[0046] 2. By rotating the energy transmission unit 310 through the operating component 100, the electrode body 201 is rotated, thereby enabling the electrode body 201 to extend or retract relative to the delivery component 300. The extension or retraction length is controlled by the first scale line 114 and the second scale line 240. This solves the problem of fixed and unadjustable electrode blade length in the prior art, providing greater flexibility and adaptability, simplifying the surgical procedure, and improving surgical accuracy and efficiency.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A surgical electrode knife, characterized in that, include: Operating component (100), electrode assembly (200), and delivery assembly (300); The operating component (100) is used to connect to the conveying component (300); The delivery assembly (300) has an energy transfer section (310). The electrode assembly (200) passes through the end of the delivery assembly (300) away from the operating assembly (100); The electrode assembly (200) is connected to the energy transfer unit (310), and the operating unit (100) is configured to drive the electrode assembly (200) to rotate along its own axis through the energy transfer unit (310), so that the electrode assembly (200) extends or retracts relative to the delivery unit (300).

2. The surgical electrode knife according to claim 1, characterized in that, The electrode assembly (200) includes an electrode body (201); The outer periphery of the electrode body (201) is provided with at least one or more spirally arranged protruding edges (210), and there is at least one protruding edge (210) on any angle plane where the axis of the electrode body (201) is located.

3. The surgical electrode knife according to claim 2, characterized in that, The conveying assembly (300) includes a housing body (320), a connecting joint (330), and a limiting member (340). The energy transfer part (310) is disposed inside the outer shell body (320). The end of the energy transfer part (310) near the electrode assembly (200) is connected to the connecting connector (330). The connecting connector (330) is used to connect the energy transfer part (310) and the electrode assembly (200). The limiting member (340) is disposed at one end of the outer shell body (320) away from the operating component (100). The electrode body (201) passes through the limiting member (340), and the inner wall of the limiting member (340) is provided with a threaded section that cooperates with the protruding edge (210) so that when the electrode assembly (200) rotates along itself, the electrode assembly (200) can extend and retract relative to the limiting member (340).

4. The surgical electrode knife according to claim 3, characterized in that, The operating component (100) includes a rotating component (110) and a fixed component (120). The rotating member (110) is used for the energy transmission part (310) to pass through, and the rotating member (110) is connected to the energy transmission part (310); The fixed member (120) is threadedly connected to the rotating member (110) so that the rotating member (110) can rotate relative to the fixed member (120).

5. The surgical electrode knife according to claim 4, characterized in that, The rotating member (110) includes a rotating part (111) and a gripping part (112). The rotating part (111) is threadedly connected to the fixed member (120), and the outer surface of the rotating part (111) is provided with a first scale line (114) along the axial direction. The gripping part (112) is connected to the rotating part (111) at one end away from the fixing member (120), and the gripping part (112) and the rotating part (111) surround and form a slot (113), the slot (113) being used for the end of the fixing member (120) to extend into.

6. The surgical electrode knife according to claim 5, characterized in that, The operating component (100) further includes a first injection component (400); The electrode body (201) is provided with a through hole (220) along the axial direction. The through hole (220) forms an inner cavity. The energy transmission part (310) has a first liquid injection channel (10) that communicates with the inner cavity. The first injection component (400) is connected to the rotating part (111), and the first injection component (400) is configured to communicate with the first injection channel (10) to inject liquid into the inner cavity through the first injection channel (10).

7. The surgical electrode knife according to claim 6, characterized in that, The first injection component (400) includes a fixed connector (410), a connector (420), and an external connector (430). The fixed joint (410) is fixed to the outer wall of the rotating member (110). The outer wall of the fixed joint (410) extends outward to form a limiting protrusion (411). The inner wall of the connector (420) is provided with a limiting groove. The limiting protrusion (411) extends into the limiting groove to restrict the connector (420) from moving along the axis relative to the fixed joint (410). The end of the external connector (430) extends into the connector (420) and is threadedly connected to the connector (420); The inner wall of the connector (420) extends to form a connector connection portion (421), which is connected to the external connector (430) and the fixed connector (410) respectively, so as to connect the external connector (430) and the fixed connector (410).

8. The surgical electrode knife according to claim 4, characterized in that, The fixing member (120) is provided with an energy access part (121), which is connected to the energy transmission part (310) and is used to transmit energy to the protruding edge (210) through the energy transmission part (310).

9. The surgical electrode knife according to claim 4, characterized in that, There is a gap between the outer shell body (320) and the energy transmission part (310) to form a second liquid injection channel (20). The fixing member (120) is provided with a second liquid injection member (500), which is connected to the second liquid injection channel (20). The second liquid injection member (500) is used to deliver liquid to the second liquid injection channel (20). The liquid in the second liquid injection channel (20) washes the outer surface of the electrode body (201) and the protruding edge (210) along the inner wall of the limiting member (340).

10. The surgical electrode knife according to claim 3, characterized in that, The electrode body (201) has an end cap (230) at the end away from the delivery assembly (300). The electrode body (201) and the end cap (230) are made of insulating material, and the protruding edge (210) is made of conductive material; The outer surface of the electrode body (201) is provided with a second scale line (240) along the axial direction.

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