Ablation electrode device with optimized internal structure of handle

Abstract

The present invention discloses an ablation electrode device with an optimized internal handle structure, comprising an emitter needle, a return electrode tube sheathed outside the emitter needle, a hollow handle connected to the return electrode tube, a first wire electrically connected to the emitter needle, and a second wire electrically connected to the return electrode tube; a storage box is disposed within the handle; the emitter needle and the first wire are fixedly connected within the storage box to form a first joint; the proximal end of the return electrode tube is disposed within the storage box; a first insulating layer is disposed over a portion of the emitter needle; and a second insulating layer is disposed over a portion of the return electrode tube. This technical solution enhances the reliability of the connection between the electrode and the wire.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more particularly to an ablation electrode device with an optimized internal structure of a handle. Background Art

[0002] Plasma ablation uses ultra-low-frequency electrical energy to stimulate saline solution to generate plasma. The resulting high-speed charged particles can break molecular bonds, causing proteins and other tissues to break down and vaporize into low-molecular-weight gases such as H2, O2, CO2, N2, and methane. This allows for minimally invasive tissue ablation.

[0003] A plasma ablation electrode device used for plasma ablation surgery generally includes an electrode assembly, a handle connected to the electrode assembly, and a wire electrically connected to the electrode. Summary of the Invention

[0004] The present invention provides an ablation electrode device with an optimized internal structure of a handle, comprising an emitter needle, a return electrode tube sleeved outside the emitter needle, a handle with a hollow structure connected to the return electrode tube, a first wire electrically connected to the emitter needle, and a second wire electrically connected to the return electrode tube;

[0005] A storage box is provided in the handle;

[0006] The emitter needle and the first wire are fixedly connected in the storage box to form a first joint;

[0007] The proximal end of the loop pole tube is arranged in the storage box;

[0008] A first insulating layer is provided on the outer surface of some of the emitter pins;

[0009] A second insulating layer is provided on the outer surface of some of the loop pole tubes.

[0010] The beneficial effects of the present invention are: 1. enhancing the reliability of the connection between the electrode and the wire; 2. making the connection between the loop electrode and the wire more convenient; 3. preventing liquid from entering the handle and causing a short circuit between the electrodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of the overall structure of an ablation electrode device with an optimized internal structure of a handle provided by an embodiment of the present invention (a cross-sectional view of the handle);

[0012] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the middle storage box;

[0013] Figure 3A schematic diagram of the overall structure of another ablation electrode device with an optimized handle internal structure provided by an embodiment of the present invention (the handle is a cross-sectional view);

[0014] Figure 4 A schematic diagram of the overall structure of another ablation electrode device with an optimized handle internal structure provided by an embodiment of the present invention (the handle is a cross-sectional view);

[0015] Figure 5 for Figure 4 Schematic diagram of the three-dimensional structure of the middle storage box;

[0016] Figure 6 A schematic diagram of the overall structure of a storage box in another ablation electrode device with optimized internal structure of the handle provided by an embodiment of the present invention;

[0017] Figure 7 for Figure 6 Schematic diagram of the split structure of the middle storage box;

[0018] Figure 8 for Figure 7 A schematic structural diagram of the first shell of the middle storage box being arranged in the ablation electrode device with optimized internal structure of the handle;

[0019] Figure 9 A schematic diagram of the overall structure of a storage box in another ablation electrode device with optimized internal structure of the handle provided by an embodiment of the present invention;

[0020] Figure 10 This is a schematic diagram of the overall structure of another ablation electrode device with optimized internal structure of the handle provided by an embodiment of the present invention (the handle is a cross-sectional view).

[0021] Figure numerals: 1, emitter needle; 11, first insulating layer; 12, emitter; 2, return electrode; 21, second insulating layer; 22, sleeve; 221, first part; 222, second part; 2221, gasket; 23, return electrode; 3, handle; 31, bump; 311, hollow channel; 4, first wire; 14, first connector; 141, connecting sleeve; 5, second wire; 51, buckle; 511, hook; 45, sheath; 6, storage box; 61, first side; 611, first opening; 612, second opening; 62, first end face; 63, second end face; 64, first shell; 641, baffle; 642, first groove; 643, second groove; 644, third groove; 65, second shell; 651, opening; 7, curing glue; 8, suction tube; 9, insulating seat. DETAILED DESCRIPTION

[0022] The technical solution of this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0023] In the description of this application, it should be noted that the terms "inner," "outer," "proximal," "distal," "far away," and "near" and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the proximal end refers to the end away from the target tissue region, i.e., the end closer to the operator; the distal end refers to the end closer to the target tissue region, i.e., the end away from the operator.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0025] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0026] The present application will be further described in detail below with reference to the accompanying drawings.

[0027] According to an embodiment of the present application, an ablation electrode device with an optimized internal structure of a handle is provided, such as Figure 1 、 Figure 2As shown, it includes: an emitter needle 1, a loop transistor 2 sleeved outside the emitter needle 1, a handle 3 with a hollow structure connected to the loop transistor 2, a first wire 4 electrically connected to the emitter needle 1, and a second wire 5 electrically connected to the loop transistor 2. A storage box 6 is provided in the hollow structure of the handle 3. The emitter needle 1 and the first wire 4 are fixedly connected in the storage box 6 to form a first joint 14, that is, the first joint 14 is provided in the storage box 6, and the proximal end of the loop transistor 2 is also provided in the storage box 6. A first insulating layer 11 is provided on the outer surface of part of the emitter needle 1, and a second insulating layer 21 is provided on the outer surface of part of the loop transistor 2. That is, except for the two ends that need to be exposed on the emitter needle 1, the rest of the part is sleeved with the first insulating layer 11. Similarly, except for the two ends that need to be exposed on the loop transistor 2, the rest of the part is sleeved with the second insulating layer 21. In this embodiment, the emitter needle 1 and the first wire 4 are fixedly connected together by welding, and the first joint 14 formed by the two is disposed in the storage box 6. This can prevent the emitter needle 1 and the first wire 4 from being disconnected due to external forces, such as pulling. In other embodiments, the emitter needle 1 and the first wire 4 can also be electrically connected using other connection methods, which are not limited in this application.

[0028] In some optional embodiments, a first opening 611 is provided on the first side surface 61 of the storage box 6. The first opening 611 penetrates the first side surface 61, and a conductive buckle 51 is connected to one end of the second wire 5. The buckle 51 is snapped into the first opening 611 and contacts the return electrode 2, thereby achieving an electrical connection between the return electrode 2 and the second wire 5. Because the buckle 51 is directly connected to the second wire 5 and the two are electrically connected, when assembling the handle 3 of the ablation electrode device with an optimized internal structure of the handle, the buckle 51 can be directly inserted into the first opening 611 to contact the return electrode 2, thereby conveniently and quickly achieving an electrical connection between the return electrode 2 and the second wire 5.

[0029] In some optional embodiments, the buckle 51 is a resilient metal buckle 51, further provided with a hook 511 on the buckle 51, and a second opening 612 is further provided on the first side 61 of the storage box 6. In this embodiment, the second opening 612 passes through the first side 61, and the hook 511 engages with the second opening 612 from the inner side of the first side 61, so that the buckle 51 is more firmly engaged in the first opening 611, ensuring that the buckle 51 and the return pole tube 2 are always in contact. The inner side is the side close to the return pole tube 2. In other embodiments, the second opening 612 may not pass through the first side 61, but may instead be formed by digging a groove on the inner side of the first side 61, which does not pass through the outer side of the first side 61, and the hook 511 engages with the groove from the inner side of the first side 61. The outer side is the side away from the return pole tube 2.

[0030] In this embodiment, the distal end of the return electrode tube 2 serves as the return electrode 23. The first and second conductors 4 and 5 are both electrically connected to the ablation host (not shown). The ablation host provides a return signal to the return electrode 23 via the second conductor 5 and the return electrode tube 2. Furthermore, an insulating base 9 is fixedly mounted at the end of the return electrode 23. The emitter 12 is fixedly mounted on the insulating base 9. The emitter 12 is electrically connected to the distal end of the emitter needle 1. The ablation host provides an ablation signal to the emitter 12 via the first conductor 4 and the emitter needle 1. In other embodiments, the emitter 12 and return electrode 23 may also be designed as other structures, which are not specifically limited in this application.

[0031] In some optional embodiments, a hollow protrusion 31 extending along the length of the handle 3 is provided on the inner side surface of the distal end of the handle 3. A sleeve 22 is provided on the outer surface of the partial return pole tube 2. The sleeve 22 is composed of a first portion 221 and a second portion 222 having different outer diameters. The outer diameter of the first portion 221 is larger than the outer diameter of the second portion 222. One end of the first portion 221 is fixedly connected to the second end surface 63 of the distal end of the storage box 6. The second portion 222 is disposed in the hollow channel 311 of the protrusion 31 and abuts the inner side surface of the distal end of the handle 3. It should be noted that abutting means that the second portion 222 and the inner side surface of the distal end of the handle 3 can be in direct contact or close to but not in contact. In addition, the outer diameter of the first portion 221 is larger than the diameter of the hollow channel 311, so that the first portion 221 rests on the end surface of the proximal end of the protrusion 31, thereby fixing the position of the return pole tube 2 relative to the handle 3.

[0032] In some optional embodiments, the first wire 4 except for the portion near the first connector 14 and the second wire 5 except for the portion connected to the buckle 51 are wrapped together with a sheath 45, one end of the sheath 45 is fixed in the storage box 6, and the rest of the sheath 45 extends from the first end surface 62 at the proximal end of the storage box 6.

[0033] In one possible implementation, Figure 3 As shown, this embodiment is Figure 1 The main difference of the ablation electrode device of the illustrated embodiment is that a gasket 2221 is disposed outside the second portion 222. The outer diameter of the gasket 2221 is larger than the diameter of the hollow channel 311, and the gasket 2221 is squeezed between the protrusion 31 and the first portion 221. The gasket 2221 can effectively prevent liquid from flowing into the handle 3 and causing a short circuit.

[0034] In one possible implementation, Figure 4 and Figure 5 As shown, this embodiment is Figure 1 、 Figure 2The main difference between the illustrated embodiment and the ablation electrode device is that the storage box 6 is filled with insulating curing adhesive 7. This curing adhesive 7 encapsulates and secures the first connector 14 within the storage box 6, further strengthening the connection between the emitter needle 1 and the first wire 4. Because the connector is solidified by the curing adhesive 7, it prevents the emitter needle 1 from disconnecting from the first wire 4 due to external forces. The return electrode 2, first insulating layer 11, first wire 4, second wire 5, and sheath 45 within the storage box 6 are also encapsulated and secured within the storage box 6 by the curing adhesive 7, further securing these components within the storage box 6. The curing adhesive 7 also prevents liquids, impurities, and other substances from entering the storage box 6 and causing short circuits. Furthermore, the second wire 5, extending from the latch 51 contacting the return electrode 2 within the storage box 6, first extends outside the storage box 6, then into the interior of the storage box 6, and finally emerges from the first end surface 62 at the proximal end of the storage box 6. It should be noted that the curing glue 7 can be UV glue, sealant or other easily curable glue. Some curing glue 7 is transparent or translucent. Figure 4 、 Figure 5 In the figure, the curing glue 7 is drawn in shaded form in order to more clearly illustrate the content of this part of the invention, and is not intended to limit the present invention. In other embodiments, the curing glue 7 can also be replaced with other insulating filling materials, which can seal and fix the first connector 14 and other components located in the storage box 6 in the storage box 6. It should be noted that when the ablation electrode device is assembled, the first connector 14, the proximal end of the return pole tube 2, and part of the first insulating layer 11, the first wire 4, the second wire 5, and the sheath 45 are first placed in the storage box 6 that has not been filled with the curing glue 7. Subsequently, the curing glue 7 is poured into the storage box 6. The curing glue 7 covers the first connector 14, the proximal end of the return pole tube 2, and part of the first insulating layer 11, the first wire 4, the second wire 5, and the sheath 45. After the curing glue 7 is cured, the first connector 14, the proximal end of the return pole tube 2, and part of the first insulating layer 11, the first wire 4, the second wire 5, and the sheath 45 are sealed and fixed in the storage box 6.

[0035] In some optional embodiments, only the first connector 14, the proximal end of the loop pole tube 2, part of the first insulating layer 11, and part of the first wire 4 can be arranged in the storage box 6, and the second wire 5 and the sheath 45 are arranged outside the storage box 6. This application does not make specific limitations.

[0036] In another possible embodiment, Figure 6 、 Figure 7 As shown, this embodiment is Figure 1 、 Figure 2 The main difference between the ablation electrode device with an optimized handle internal structure in the illustrated embodiment is the different structure of the storage box 6 in the ablation electrode device. Figure 6 、 Figure 7The figures are schematic diagrams of the overall structure and the split structure of the storage box 6 in this embodiment, respectively. The storage box 6 in this embodiment comprises a first housing 64 and a second housing 65, held together by a buckle 51. The first connector 14, the proximal end of the return pole tube 2, a portion of the first insulating layer 11, the first wire 4, the second wire 5, and the sheath 45 are all disposed within the first housing 64, which is covered by the second housing 65. Furthermore, the second wire 5, extending from the buckle 51, which contacts the return pole tube 2 within the storage box 6, first extends outside the storage box 6, then extends into the storage box 6 through an opening 651 in the second housing 65, and finally protrudes from the first end face 62 at the proximal end of the storage box 6. A first opening 611 is provided through the first side surface 61 of the first housing 64. A portion of the second wire 5, along with the buckle 51, passes through the opening 651 in the second housing 65, and the buckle 51 engages within the first opening 611 at the junction with the return pole tube 2. A second opening 612 is provided on the first side surface 61 of the first housing 64, and the hook 511 is snapped into the second opening 612. In this embodiment, the first housing 64 and the second housing 65 are snapped together by the cooperation of the grooves and protrusions. In other embodiments, other methods can also be used to make the two detachable and fit together.

[0037] By snapping the first shell 64 and the second shell 65 together, the first connector 14, the proximal end of the loop pole tube 2 and part of the first insulating layer 11, the first wire 4, the second wire 5, and the sheath 45 are all arranged in the storage box 6, so as to better prevent the first connector 14 from being disconnected due to external force.

[0038] In some optional embodiments, only the first connector 14, the proximal end of the loop pole tube 2, part of the first insulating layer 11, and part of the first wire 4 can be arranged in the storage box 6, and the second wire 5 and the sheath 45 are arranged outside the storage box 6. This application does not make specific limitations.

[0039] In some optional embodiments, see Figure 6 、 Figure 7 as well as Figure 8 ( Figure 8 for Figure 7(Schematic diagram of the structure in which the first shell 64 of the middle storage box 6 is arranged in the ablation electrode device for optimizing the internal structure of the handle) A baffle 641 is arranged in the first shell 64. The baffle 641 is arranged on the upper side surface of the bottom surface of the first shell 64, and the upper side surface faces the second shell 65. The baffle 641 separates the first shell 64 into a first groove 642 and a second groove 643. The first connector 14 is arranged in the first groove 642, and the second groove 643 is used to arrange the suction tube 8, and the suction tube 8 is used to suck out physiological saline. It should be noted that the first connector 14 can also be arranged in the second groove 643, and the suction tube 8 can be arranged in the first groove 642. The first connector 14 and the suction tube 8 are separated by the baffle 641, and the two do not affect each other, and it is convenient to operate when assembling at the handle 3 of the ablation device. In addition, a third groove 644 is provided in the first shell 64 . The proximal end of the loop pole tube 2 passes through the second end surface 63 of the storage box 6 opposite to the first end surface 62 and is provided in the third groove 644 , making the loop pole tube 2 more stable in the first shell 64 .

[0040] It should be noted that, in other embodiments, the baffle 641 may not be provided in the first housing 64. This application does not impose any specific limitation.

[0041] In another possible embodiment, Figure 9 As shown, this embodiment is Figure 6 、 Figure 8 The main difference of the illustrated embodiment is that the storage box 6 is filled with insulating curing glue 7, and the first connector 14 is encapsulated and fixed in the storage box 6 by the curing glue 7, so that the connection between the emitter needle 1 and the first wire 4 is more secure, because it has been solidified by the curing glue 7, which can better prevent the emitter needle 1 from being disconnected from the first wire 4 due to external pulling. The proximal end of the loop transistor 2 in the storage box 6 and part of the first insulating layer 11, the first wire 4, the second wire 5, the sheath 45, and the suction tube 8 are also encapsulated and fixed in the storage box 6. These components are more firmly fixed in the storage box 6, and the curing glue 7 can further prevent liquids, impurities, etc. from entering the first connector 14 and causing short circuits. It should be noted that the curing glue 7 can be UV glue, sealant or other easy-to-cure glue. Some curing glues 7 are transparent or translucent. Figure 9In the figure, the curing glue 7 is drawn in shaded form in order to more clearly show the content of this part of the invention, and is not used to limit the present invention. In other embodiments, the curing glue 7 can also be replaced with other insulating filling materials, which can seal and fix the first connector 14 and other components located in the storage box 6 in the storage box 6. It should be noted that when the ablation electrode device is assembled, the first connector 14, the proximal end of the return pole tube 2 and part of the first insulating layer 11, the first wire 4, the second wire 5, the sheath 45, and the suction tube 8 are first placed in the first shell 64 of the storage box 6 that has not been filled with the curing glue 7. The first connector 14 is arranged in the first groove 642, the suction tube 8 is arranged in the second groove 643, and the proximal end of the return pole tube 2 is arranged in the third groove 644. The second shell 65 is placed on the first shell 64, and part of the second wire 5 together with the buckle 51 are first passed through an opening 651 on the second shell 65 and the buckle 51 is clamped. The buckle 51 is snapped into the first opening 611 on the first shell 64, and then the second shell 65 is snapped onto the first shell 64. Finally, the curing glue 7 is poured into the storage box 6 from the opening 651 on the second shell 65. The curing glue 7 covers the first connector 14, the proximal end of the loop pole tube 2 and part of the first insulating layer 11, the first wire 4, the second wire 5, the sheath 45, and the suction tube 8. After the curing glue 7 is cured, the first connector 14, the proximal end of the loop pole tube 2 and part of the first insulating layer 11, the first wire 4, the second wire 5, the sheath 45, and the suction tube 8 are encapsulated and fixed in the storage box 6.

[0042] In some optional embodiments, only the first connector 14, the proximal end of the loop pole tube 2, part of the first insulating layer 11, and part of the first wire 4 can be arranged in the storage box 6, and the second wire 5 and the sheath 45 are arranged outside the storage box 6. This application does not make specific limitations.

[0043] It should be noted that in order to more clearly illustrate the present invention with the accompanying drawings, Figure 4-Figure 7 、 Figure 9 The first connector 14, the loop electrode 2, the first insulating layer 11, the first wire 4, the second wire 5, the sheath 45 and the suction tube 8 arranged in the storage box 6 are not drawn. These drawings mainly show the structure of the storage box 6 in an ablation electrode device with an optimized internal structure of the handle, but are not used to limit the present invention.

[0044] In another possible embodiment, Figure 10 As shown, this embodiment is Figure 1The main difference in the illustrated embodiment is that a metal connection sleeve 141 securely connects one end of the emitter needle 1 to one end of the first wire 4 at the first joint 14. To achieve a better connection, in this embodiment, the emitter needle 1 and the first wire 4 are welded together at the first joint 14. The provision of the metal connection sleeve 141 provides a more secure connection between the emitter needle 1 and the first wire 4, resulting in a better electrical connection.

[0045] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An ablation electrode device with an optimized handle internal structure, characterized in that: It comprises an emitter needle (1), a loop transistor (2) sleeved outside the emitter needle (1), a handle (3) with a hollow structure connected to the loop transistor (2), a first wire (4) electrically connected to the emitter needle (1), and a second wire (5) electrically connected to the loop transistor (2); A storage box (6) is provided in the handle (3); The emitter needle (1) and the first wire (4) are fixedly connected in the storage box (6) to form a first joint (14); The proximal end of the loop pole tube (2) is arranged in the storage box (6); A first insulating layer (11) is provided on the outer shell of part of the emitter needle (1); A second insulating layer (21) is provided on the outer shell of some of the loop pole tubes (2); The storage box (6) is filled with curing glue (7), and the curing glue (7) seals and fixes the first joint (14) in the storage box (6); A first opening (611) is provided on the first side surface (61) of the storage box (6); One end of the second wire (5) is connected to a conductive buckle (51), and the buckle (51) is snapped into the first opening (611) and in contact with the loop electrode (2); The second wire (5) extending from the buckle (51) first extends outside the storage box (6), then extends into the interior of the storage box (6), and finally extends from the first end surface (62) at the proximal end of the storage box (6).

2. The ablation electrode device with optimized handle internal structure according to claim 1, characterized in that: A second opening (612) is provided on the first side surface (61) of the storage box (6); The buckle (51) is an elastic metal buckle (51); A hook (511) is provided on the buckle (51), and the hook (511) is locked into the second opening (612).

3. The ablation electrode device with optimized handle internal structure according to claim 1, characterized in that: The first joint (14) is fixedly connected to one end of the emitter needle (1) and one end of the first wire (4) via a metal connecting sleeve (141).

4. The ablation electrode device with optimized handle internal structure according to claim 1, characterized in that: The storage box (6) comprises a first shell (64) and a second shell (65) that are snapped together; The first opening (611) is provided on the first side surface (61) of the first housing (64); The first connector (14) and the proximal end of the loop pole tube (2) are arranged in the first housing (64).

5. The ablation electrode device with optimized handle internal structure according to claim 4, characterized in that: A baffle (641) is provided in the first housing (64), and a first groove (642) and a second groove (643) are formed on both sides of the baffle (641); The first joint (14) is disposed in the first groove (642); The proximal end of the loop pole tube (2) passes through the second end surface (63) of the storage box (6) opposite to the first end surface (62) and is arranged in a third groove (644) in the first shell (64).

6. The ablation electrode device with optimized handle internal structure according to claim 5, characterized in that: A hollow protrusion (31) is provided on the inner side surface of the distal end of the handle (3) and extends along the length direction of the handle (3); A sleeve (22) is provided outside a portion of the loop pole tube (2), the sleeve (22) consisting of a first portion (221) and a second portion (222) having different outer diameters, the outer diameter of the first portion (221) being greater than the outer diameter of the second portion (222); One end of the first portion (221) is fixedly connected to the second end surface (63) of the storage box (6); The second portion (222) is disposed in the hollow channel (311) of the protrusion (31) and abuts against the inner side surface of the distal end of the handle (3); The outer diameter of the first portion (221) is greater than the diameter of the hollow channel (311); A washer (2221) is disposed outside the second portion (222), the outer diameter of the washer (2221) being larger than the diameter of the hollow channel (311), and the washer (2221) is squeezed between the protrusion (31) and the first portion (221).

7. The ablation electrode device with optimized handle internal structure according to claim 4, characterized in that: A second opening (612) is provided on the first side surface (61) of the first housing (64); The buckle (51) is an elastic metal buckle (51); A hook (511) is provided on the buckle (51), and the hook (511) is locked into the second opening (612).

8. The ablation electrode device with optimized handle internal structure according to claim 1, characterized in that: The distal end of the loop electrode tube (2) is a loop electrode (23); An insulating seat (9) is fixedly mounted on the end of the loop pole (23); The emitter (12) is fixedly mounted on the insulating seat (9), and the emitter (12) is electrically connected to the far end of the emitter sub-needle (1).

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