Ablation electrode

Abstract

The invention relates to medical instruments, in particular to an ablation electrode, an emitting electrode of the ablation electrode comprises an emitting electrode body (1) and an electrode slice (2), the emitting electrode body (1) comprises an electrode wire (101), an electrode tip (102) arranged at one end of the electrode wire (101) and an insulating pipeline (103) wrapping the outer side of the electrode wire (101), and a through hole (3) allowing the emitting electrode body (1) to penetrate through is formed in the electrode slice (2). The electrode tip (102) is arranged on the emitter body (1) and can slide relative to the emitter body (1) so that the electrode tip (102) and the electrode tip (2) can be switched between an extended state in which the electrode tip (102) is in contact with the insulating tube (103) and away from the electrode tip (102) and a retracted state in which the electrode tip (102) is in contact with the electrode tip (2), and the electrode tip (102) and the electrode tip (2) are configured to be suitable for being in contact with tissue of a patient at the same time. According to the ablation electrode, free switching between small-area ablation and large-area ablation can be achieved.

Description

Technical Field

[0001] This invention relates to medical devices, and more specifically, to an ablation electrode. Background Technology

[0002] An ablation electrode is a precision instrument used in medical surgery. It primarily works by releasing energy such as radiofrequency current or microwaves to selectively destroy diseased tissue while protecting surrounding healthy tissue.

[0003] Existing ablation electrodes have a fixed contact area with the lesion tissue and cannot be adjusted according to the size of the lesion, thus making it impossible to adjust the ablation treatment area. In the same procedure, different situations may require changing the ablation electrode, a cumbersome process that delays treatment.

[0004] Therefore, it is necessary to design an ablation electrode that can effectively solve or alleviate the above-mentioned technical defects. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an ablation electrode that can adjust its contact area with the lesion tissue, and can freely switch between small-area ablation and large-area ablation.

[0006] To address the aforementioned technical problems, the present invention provides an ablation electrode comprising an emitter and a return electrode. The emitter includes an emitter body and an electrode sheet. The emitter body includes an electrode wire, an electrode head disposed at one end of the electrode wire, and an insulating conduit wrapped around the outside of the electrode wire. The electrode sheet has a through hole through which the emitter body passes, and the electrode sheet is slidable relative to the emitter body to switch between a retracted state and an extended state. In the retracted state, the electrode sheet is in contact with the insulating conduit and away from the electrode head. In the extended state, the electrode head is in contact with the electrode sheet, and the electrode head and the electrode sheet are configured to simultaneously contact patient tissue.

[0007] Specifically, the ablation electrode also includes a support, the electrode sheet is connected to the support, a first receiving cavity is formed in the support, one end of the emitter body away from the electrode head is disposed in the first receiving cavity, the other end extends out of the first receiving cavity, and the emitter body can slide relative to the first receiving cavity so that the electrode head and the electrode sheet switch between the retracted state and the extended state.

[0008] Preferably, it further includes a telescopic drive mechanism for driving the emitter body to slide.

[0009] Preferably, it further includes an angle adjustment mechanism for adjusting the orientation of the electrode head and the electrode sheet.

[0010] Specifically, the angle adjustment mechanism includes a rotating seat, an angle push rod, and a ball-head tube. The rotating seat has an opening for mounting the electrode plate. The ball-head tube is sleeved on the outer surface of the insulating pipeline. The ball-head tube includes a tube body and a ball head connected to each other. The ball head is rotatably connected to the rotating seat. The end of the tube body away from the ball head is disposed in the first receiving cavity, and the end of the tube body near the ball head extends out of the first receiving cavity. The emitter body can slide along the extension direction of the ball-head tube. A second receiving cavity is formed in the support. One end of the angle push rod is slidably disposed in the second receiving cavity, and the other end is rotatably connected to the rotating seat so that the rotating seat can be rotated around the ball head by sliding the angle push rod.

[0011] Preferably, the portion of the tube extending out of the first receiving cavity has a bend, and the angled push rod is a bendable angled push rod.

[0012] Specifically, the rotating seat includes an insulated electrode seat and the circuit electrode connected to each other, the opening is formed in the insulated electrode seat, the ball head tube and / or the angle push rod are rotatably connected to the circuit electrode, and the ball head tube and / or the angle push rod are made of conductive material.

[0013] Preferably, the end of the support near the electrode head is recessed inward to form several injection channels and / or several suction channels.

[0014] Preferably, the electrode sheet has multiple protrusions on the surface near the electrode head.

[0015] Specifically, the electrode head includes a columnar portion and an extended portion. The columnar portion is located between the extended portion and the electrode wire. The diameter of the extended portion is larger than the diameter of the columnar portion and the diameter of the through hole. The diameter of the columnar portion is the same as the diameter of the insulating conduit.

[0016] Through the above technical solution, the present invention provides an ablation electrode. The electrode wire of this ablation electrode is used to connect to a power supply component. The electrode head and electrode plate can switch between a retracted state and an extended state. In the extended state, the electrode plate of the ablation electrode contacts the insulating tubing surrounding the electrode wire. At this time, the electrode head is energized by connecting to the power supply component through the electrode wire. The electrode head is used to contact the patient tissue to cooperate with the circuit electrode for ablation. In the retracted state, the electrode plate of the ablation electrode contacts the electrode head, making the electrode plate and electrode head electrically connected. Both the electrode plate and electrode head can simultaneously contact the patient tissue, thereby achieving a larger ablation area. By driving the electrode plate and the emitter body to slide relative to each other, the electrode head and electrode plate can switch between the extended and retracted states, thereby achieving switching between different ablation areas without changing the ablation electrode. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the ablation electrode in the retracted state according to a specific embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the ablation electrode with different orientations of the electrode head in the retracted state according to a specific embodiment of the present invention; Figure 3 This is a schematic diagram of the ablation electrode in the extended state according to a specific embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the ablation electrode with the electrode head facing different directions in the extended state, according to a specific embodiment of the present invention; Figure 5 This is a cross-sectional schematic diagram of the ablation electrode in the extended state according to a specific embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the first injection channel, the second injection channel, and the suction channel of the ablation electrode according to a specific embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures 1. Emitter body; 101. Electrode wire; 102. Electrode head; 103. Insulating tubing; 2. Electrode sheet; 3. Through hole; 4. Support; 5. Rotating seat; 501. Insulating electrode seat; 502. Circuit electrode; 6. Angle push rod; 7. Ball head tube; 701. Tube body; 702. Ball head; 703. Bending part; 8. Opening; 9. Protrusion; 10. Columnar part; 11. Extension part; 12. First injection channel; 13. Second injection channel; 14. Suction channel; 15. Stainless steel tube; 16. Heat shrink tubing. Detailed Implementation

[0019] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of the present invention by way of example, but should not be used to limit the scope of the present invention. The present invention can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0020] These embodiments are provided to make the invention thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, in the description of this invention, unless otherwise stated, words such as "comprising" or "including" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0021] It should also be noted that, in the description of this invention, 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 direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0022] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this invention pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0023] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0024] like Figures 1 to 6 As shown, the ablation electrode of the present invention includes an emitter and a return electrode 502. The ablation electrode may include a power supply assembly, with both the emitter and return electrode 502 electrically connected to the power supply assembly. Preferably, the power supply assembly is capable of adjusting output power; alternatively, a separate power supply assembly may be provided and electrically connected to the emitter and return electrode 502. The emitter includes an emitter body 1 and an electrode plate 2. The emitter body 1 includes an electrode wire 101, an electrode head 102 disposed at one end of the electrode wire 101, and an insulating conduit 103 wrapped around the outside of the electrode wire 101. The electrode wire 101 is used to electrically connect to the power supply assembly. The electrode plate 2 has a through hole 3 through which the emitter body 1 passes, and the electrode plate 2 is slidable relative to the emitter body 1, allowing the electrode head 102 and the electrode plate 2 to switch between an extended state and a retracted state. Figure 3 and Figure 4 As shown, in the extended state, electrode 2 is in contact with the insulating conduit 103 and away from the electrode head 102. At this time, the electrode head 102 can be electrically connected to the power supply assembly through the electrode wire 101. The electrode wire 101 and electrode 2 are insulated from each other by the insulating conduit 103. The extended electrode head 102 can contact the patient's tissue, while the electrode 2 does not. In this extended state, the ablation electrode performs small-area ablation through the electrode head 102 to precisely target tiny abnormal lesions. Figure 1 and Figure 2As shown, in the retracted state, the electrode head 102 is in contact with the electrode pad 2, and the electrode head 102 and the electrode pad 2 are configured to simultaneously contact the patient's tissue. At this time, the electrode head 102 and the electrode pad 2 are both electrically connected to the power supply assembly, and the electrode head 102 and the electrode pad 2 can simultaneously contact the patient's tissue to perform a large-area ablation, forming a coagulation necrosis foci of sufficient area during the operation.

[0025] As a specific implementation method, such as Figure 5 As shown, the ablation electrode may further include a support 4, with the electrode plate 2 connected to the support 4. A first receiving cavity is formed within the support 4. One end of the emitter body 1, away from the electrode head 102, is disposed in the first receiving cavity, and the other end extends out of the first receiving cavity. The emitter body 1 is slidable relative to the first receiving cavity, allowing the electrode head 102 and the electrode plate 2 to switch between an extended state and a retracted state. In this embodiment, the electrode plate 2 is fixed in position relative to the support 4, and the switching between the extended and retracted states is achieved by sliding the emitter body 1. In other embodiments, the emitter body 1 may also be fixed in position relative to the support 4, with an additional sliding connector. One end of the sliding connector is connected to the electrode plate 2, and the other end is slidably disposed on the first receiving cavity axis. The sliding of the sliding connector drives the electrode plate 2 to slide, thereby allowing the electrode head 102 and the electrode plate 2 to switch between an extended state and a retracted state.

[0026] In some specific embodiments, such as Figure 5 As shown, a stainless steel tube 15 is fitted on the outside of the support 4, and a heat shrink tube 16 is wrapped around the stainless steel tube 15 so that the support 4, the stainless steel tube 15 and the heat shrink tube 16 together form a grip handle.

[0027] In a preferred embodiment, the ablation electrode of the present invention further includes a telescopic drive mechanism for driving the emitter body 1 to slide. The tail of the emitter body 1 is connected to the telescopic drive mechanism, which can be a toggle switch. The surgeon can manually toggle the toggle switch to move it along the axial direction of the support 4, causing the emitter body 1 to slide relative to the first receiving cavity. In other embodiments, a drive motor can also be used to drive the emitter body 1 to slide relative to the first receiving cavity.

[0028] As a preferred implementation method, such as Figures 1 to 5 As shown, the ablation electrode also includes an angle adjustment mechanism for adjusting the orientation of the electrode head 102 and the electrode pad 2, so that the surgeon can adjust the orientation of the electrode head 102 and the electrode pad 2 to perform surgical operations in situations where the space is limited.

[0029] As a specific implementation method, such as Figures 1 to 5As shown, the angle adjustment mechanism includes a rotating base 5, an angle push rod 6, and a ball-head tube 7. The rotating base 5 has an opening 8 on the side away from the support 4 for mounting the electrode plate 2. The ball-head tube 7 is sleeved on the outer surface of the insulating conduit 103. The ball-head tube 7 includes a tube body 701 and a ball head 702 connected to each other. The ball head 702 is rotatably connected to the rotating base 5, and the rotating base 5 correspondingly forms a clearance structure to avoid obstructing the rotation of the rotating base 5 relative to the ball head 702. One end of the tube body 701 away from the ball head 702 is disposed in the first receiving cavity and is fixedly connected to the support 4. The other end of the tube body 701 near the ball head 702 extends out of the first receiving cavity. The emitter body 1 can slide along the extension direction of the ball head tube 7. A second receiving cavity is formed in the support 4. One end of the angle push rod 6 is slidably disposed in the second receiving cavity, and the other end is rotatably connected to the rotating seat 5. When the angle push rod 6 extends and retracts, it can drive the rotating seat 5 to rotate relative to the ball head 702, thereby changing the orientation of the electrode plate 2 disposed on the rotating seat 5. The emitter body 1 has a certain degree of flexibility. After the orientation of the electrode plate 2 is changed, the emitter body 1 passing through the through hole 3 on the electrode plate 2 can be bent, thereby changing the orientation of the electrode head 102 on the emitter body 1.

[0030] As a preferred implementation method, such as Figure 5 As shown, the portion of the tube 701 extending out of the first receiving cavity has a bent portion 703. The angled push rod 6 is a flexible angled push rod, which facilitates the surgeon in adjusting the orientation of the electrode head 102 and the electrode pad 2 when the space is limited, thereby increasing the angle adjustment range. The angled push rod 6 is flexible and has a certain strength to prevent the orientation of the electrode head 102 and the electrode pad 2 from being changed arbitrarily.

[0031] As a preferred implementation method, such as Figure 5 As shown, the rotating base 5 includes an insulated electrode base 501 and a circuit electrode 502 connected to each other. An opening 8 is formed in the insulated electrode base 501. A ball-head tube 7 and / or an angled rod 6 are rotatably connected to the circuit electrode 502. The ball-head tube 7 and / or the angled rod 6 are made of conductive material to electrically connect to the power supply assembly. In some embodiments, both the ball-head tube 7 and the angled rod 6 are rotatably connected to the circuit electrode 502. Both the ball-head tube 7 and the angled rod 6 are made of conductive material, and the ends of the ball-head tube 7 and the angled rod 6 away from the circuit electrode 502 are connected to the power supply assembly, so that the circuit electrode 502 can be electrically connected to the power supply assembly through the ball-head tube 7 and the angled rod 6. In some more specific embodiments, the angled rod 6 can be a metal flat sheet to electrically connect the power supply assembly and the circuit electrode 502, and the angled rod 6 is flexible while having a certain strength.

[0032] As a preferred implementation method, such as Figure 6As shown, the end of the support 4 near the electrode head 102 is recessed inward to form several injection channels and / or several suction channels. The injection channels can deliver fluid to the surgical site, such as saline solution, while the suction channels can remove air bubbles, tissue debris, and fluid generated during the surgery. Each channel can be connected to a fixing device, such as a fixed connection to an existing irrigation device or a fixed connection to an existing suction device, so that the channel has either injection or suction functions. Alternatively, each channel can be configured to switch between different devices, allowing the channel to switch between injection and suction, thereby adjusting the number of injection and suction channels according to the needs of different surgical stages.

[0033] As a preferred implementation method, such as Figures 1 to 4 As shown, multiple protrusions 9 are formed on the surface of the electrode sheet 2 near the electrode head 102, which is beneficial for better excitation of the plasma state in the electric field.

[0034] As a specific implementation method, such as Figure 5 As shown, the electrode head 102 includes a columnar portion 10 and an epitaxial portion 11. The columnar portion 10 is located between the epitaxial portion 11 and the electrode wire 101. The diameter of the epitaxial portion 11 is larger than the diameter of the columnar portion 10 and the diameter of the through hole 3. The diameter of the columnar portion 10 is the same as the diameter of the insulating conduit 103. During the process of switching from the retracted state to the extended state, the electrode sheet 2 can slide relative to the emitter body 1 towards the epitaxial portion 11 until the electrode sheet 2 abuts against the epitaxial portion 11, so that the electrode head 102 and the electrode sheet 2 switch to the extended state. In the extended state, both the columnar portion 10 and the epitaxial portion 11 can contact the electrode sheet 2.

[0035] like Figures 1 to 6As shown, the present invention provides an ablation electrode, which includes an emitter body 1, an electrode plate 2, a support 4, and an angle adjustment mechanism. The emitter body 1 includes an electrode wire 101, an electrode head 102 disposed at one end of the electrode wire 101, and an insulating conduit 103 wrapped around the outside of the electrode wire 101. The insulating conduit 103 is an FEP tube (perfluoroethylene propylene tube). Multiple protrusions 9 are formed on the surface of the electrode plate 2 near the electrode head 102. The angle adjustment mechanism includes a rotating seat 5, an angle push rod 6, and a ball-head tube 7. A first receiving cavity is formed within the support 4 along the axial direction of the support 4. The ball-head tube 7 includes a tube body 701 and a ball head 702. One end of the tube body 701 is disposed in a first receiving cavity, and the other end of the tube body 701 extends out of the first receiving cavity and is connected to the ball head 702. The portion of the tube body 701 extending out of the first receiving cavity forms a bend 703. A guide cavity is formed inside the ball-head tube 7 along the tube body 701 and the ball head 702. The end of the emitter body 1 away from the electrode head 102 is slidably disposed in the guide cavity. The rotating seat 5 includes an insulating electrode seat 501 and a circuit electrode 502. The circuit electrode 502 is rotatably connected to the ball head 702. The insulating electrode seat 501 is connected to the side of the circuit electrode 502 away from the ball head 702. An opening 8 for setting the electrode plate 2 is formed on the side of the insulating electrode seat 501 away from the ball head. A through hole 3 is formed on the electrode plate 2 for the emitter body 1 to pass through. A second receiving cavity is also formed inside the support 4 along the axial direction of the support 4. One end of the angled push rod 6 is slidably disposed in the second receiving cavity, and the other end is rotatably connected to the circuit electrode 502. The angled push rod 6 is a bendable metal flat plate. Sliding along the second receiving cavity, the angled push rod 6 can push or pull the circuit electrode 502, causing the rotating seat 5 to rotate around the ball head 702. The rotation of the rotating seat 5 causes the emitter body 1 to bend accordingly, thereby changing the orientation of the electrode head 102 and the electrode plate 2. The electrode head 102 includes a columnar portion 10 and an extension portion 11. The columnar portion 10 is located between the extension portion 11 and the electrode wire 101. The diameter of the extension portion 11 is larger than the diameter of the columnar portion 10 and the diameter of the through hole 3. The diameter of the columnar portion 10 is the same as the diameter of the insulating conduit 103. A first injection channel 12, a second injection channel 13, and a suction channel 14 are also formed within the support 4. The electrode head 102 can be connected to a power source through the electrode wire 101, the circuit electrode 502 can be connected to a power source through the ball head tube 7, and the emitter body 1 can slide along the guide cavity, realizing the extension and retraction of the emitter body 1. In the extended state, as... Figure 3 and Figure 4 As shown, electrode 2 is in contact with insulating conduit 103. This ablation electrode achieves ablation over a small area through electrode head 102. In the retracted state, as... Figure 1 and Figure 2 As shown, both the columnar portion 10 and the extended portion 11 are in contact with the electrode sheet 2. The ablation electrode achieves a large-area ablation through the electrode head 102 and the electrode sheet 2, thereby completing hemostasis, cutting, drilling and other tasks.

[0036] As can be seen from the above description, the advantages of the towing cable device of the present invention are: First, the ablation electrode of the present invention can switch between different ablation areas without replacement, making it convenient to use; Secondly, the ablation electrode of the present invention has a large range of electrode direction adjustment and is easy to use; Third, the ablation electrode of the present invention provides multiple suction and injection channels.

[0037] The various embodiments of the present invention have now been described in detail. To avoid obscuring the concept of the invention, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solutions disclosed herein based on the above description.

[0038] While specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of the invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any manner.

Claims

1. An ablation electrode comprising an emitter and a return electrode (502), characterized in that, The emitter comprises an emitter main body (1) and an electrode sheet (2), the emitter main body (1) comprises an electrode wire (101), an electrode head (102) arranged at one end of the electrode wire (101), and an insulating pipeline (103) wrapped outside the electrode wire (101), the electrode sheet (2) is formed with a through hole (3) for the emitter main body (1) to pass through, and the electrode sheet (2) can slide relative to the emitter main body (1) to switch the electrode head (102) and the electrode sheet (2) between an extended state and a retracted state, in the extended state, the electrode sheet (2) is in contact with the insulating pipeline (103) and away from the electrode head (102), in the retracted state, the electrode head (102) is in contact with the electrode sheet (2), and the electrode head (102) and the electrode sheet (2) are configured to be suitable for contacting the patient tissue at the same time.

2. The ablation electrode of claim 1, wherein, Further comprising a support (4), the electrode sheet (2) is connected with the support (4), the support (4) is formed with a first accommodating cavity, one end of the emitter main body (1) away from the electrode head (102) is arranged in the first accommodating cavity, the other end extends out of the first accommodating cavity, and the emitter main body (1) can slide relative to the first accommodating cavity to switch the electrode head (102) and the electrode sheet (2) between the extended state and the retracted state.

3. The ablation electrode of claim 2, wherein, Further comprising a telescopic driving mechanism for driving the emitter main body (1) to slide.

4. The ablation electrode of claim 2, wherein, Further comprising an angle adjusting mechanism for adjusting the orientation of the electrode head (102) and the electrode sheet (2).

5. The ablation electrode of claim 4, wherein, The angle adjusting mechanism comprises a rotating seat (5), an angle jack (6), and a ball head pipe (7), the rotating seat (5) is formed with an opening (8) for arranging the electrode sheet (2), the ball head pipe (7) is sleeved on the outer surface of the insulating pipeline (103), the ball head pipe (7) comprises a pipe body (701) and a ball head (702) connected with each other, the ball head (702) is rotationally connected with the rotating seat (5), one end of the pipe body (701) away from the ball head (702) is arranged in the first accommodating cavity, the other end of the pipe body (701) close to the ball head (702) extends out of the first accommodating cavity, the emitter main body (1) can slide along the extension direction of the ball head pipe (7), the support (4) is formed with a second accommodating cavity, one end of the angle jack (6) is slidably arranged in the second accommodating cavity, and the other end of the angle jack (6) is rotationally connected with the rotating seat (5) to drive the rotating seat (5) to rotate around the ball head (702) through the sliding of the angle jack (6).

6. The ablation electrode of claim 5, wherein, The part of the pipe body (701) extending out of the first accommodating cavity is formed with a bending part (703), and the angle jack (6) is a bendable angle jack.

7. The ablation electrode of claim 5, wherein, The rotating seat (5) comprises an insulating electrode seat (501) and the loop electrode (502) connected with each other, the opening (8) is formed in the insulating electrode seat (501), the ball head pipe (7) and / or the angle ejector rod (6) are rotatably connected with the loop electrode (502), and the ball head pipe (7) and / or the angle ejector rod (6) are made of conductive material.

8. The ablation electrode of claim 2, wherein, The support (4) is inwardly recessed at one end close to the electrode head (102) to form a plurality of injection channels and / or a plurality of suction channels.

9. The ablation electrode of claim 1, wherein, A plurality of protrusions (9) are formed on the surface of the electrode sheet (2) close to the electrode head (102).

10. The ablation electrode of claim 1, wherein, The electrode head (102) comprises a cylindrical part (10) and an extension part (11), the cylindrical part (10) is located between the extension part (11) and the electrode wire (101), the diameter of the extension part (11) is greater than the diameter of the cylindrical part (10) and the diameter of the through hole (3), and the diameter of the cylindrical part (10) is the same as the diameter of the insulating pipeline (103).

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