Prepressing distance device of tungsten filament and prepressing method of tungsten filament of surgical instrument

Abstract

The invention provides a pre-pressing distance device of a tungsten filament and a pre-pressing method of the tungsten filament of a surgical instrument.The pre-pressing distance device of the tungsten filament is applied to the surgical instrument, the surgical instrument comprises a fiber tube and the tungsten filament which are connected, and the pre-pressing distance device comprises a base; the fiber pipe fixing part is arranged on the base and is used for fixing a fiber pipe; the distance determining part comprises a plurality of moving blocks which are arranged at intervals, each moving block is provided with a plurality of fixing grooves for fixing a plurality of tungsten filaments, and the plurality of moving blocks can define a plurality of tungsten filaments with different lengths. According to the embodiment of the invention, the length of the corresponding tungsten filament is limited through the position of each moving block, so that the tungsten filaments can be arranged in the corresponding fixing grooves after the preset lengths of the tungsten filaments are limited by the moving blocks at the same time, the tungsten filaments can be pre-pressed, the distance determining part does not need to be adjusted for multiple times, and the machining efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of medical technology, in particular to a tungsten wire pre-compression distance device and a tungsten wire pre-compression method for a surgical instrument. Background Art

[0002] With the development of surgical robots, more and more manual surgeries are being replaced. Surgical robots have advantages such as intelligence and stability, and have achieved excellent surgical results in practice. The entire surgical robot system usually includes multiple surgical arms, and the rotation and movement of the surgical arms are affected by the length of the tungsten wire.

[0003] However, since the lengths of the tungsten wires moving in different directions are different, multiple adjustments need to be made according to the preset length of the tungsten wires during the tungsten wire pre-pressing process, resulting in excessively long processing time and low efficiency. Summary of the Invention

[0004] The problem solved by the present invention is the low efficiency of tungsten wire pre-pressing processing in existing surgical instruments.

[0005] To solve the above problems, the present invention provides a tungsten wire preload distance device, which is applied to a surgical instrument. The surgical instrument includes a fiber tube and a tungsten wire connected together. The preload distance device includes: base; a fiber tube fixing portion, the fiber tube fixing portion being arranged on the base and being used to fix the fiber tube; The distance determining part includes a plurality of movable blocks spaced apart from each other, each movable block is provided with a plurality of fixing grooves for fixing the plurality of tungsten wires, wherein the plurality of movable blocks can define a plurality of tungsten wires of different lengths.

[0006] Optionally, each of the tungsten wires passes through the plurality of moving blocks in sequence, and a steel tube is provided on each of the tungsten wires; Each of the moving blocks is provided with a limiting groove whose notch size is smaller than the size of the steel tube. When the steel tube on each tungsten wire moves in the first direction along the tungsten wire to the fiber tube until it conflicts with the limiting groove, the corresponding moving block limits the length of the corresponding tungsten wire.

[0007] Optionally, one moving block is used to limit the length of multiple tungsten wires moving in the same direction, and the position of each moving block on the base is adjusted according to the preset length of each tungsten wire.

[0008] Optionally, the distance determining unit further includes: a first fixed block, which is fixedly disposed on the base and located on a side of the movable block away from the fiber tube; a second fixed block, the second fixed block being fixedly disposed on the base and located on a side of the movable block close to the fiber tube; a positioning pin, one end of which is connected to the first fixed block, and the other end of which is connected to the second fixed block after passing through the plurality of movable blocks in sequence; Multiple connecting parts, one end of each connecting part passes through the multiple moving blocks in sequence and is connected to the second fixed block, the other end of the connecting part passes through the first fixed block and is connected to the nut, and one connecting part is connected to one moving block, and the corresponding moving block is driven to move by turning the nut.

[0009] Optionally, the distance determining unit further includes: A plurality of springs, one of which is provided on one of the connecting members, each of which has a different length and is in a non-compressed state.

[0010] Optionally, the pre-compression distance device further includes: A movable wire divider is arranged on a side of the distance determining portion close to the fiber tube fixing portion. The movable wire divider is provided with a plurality of grooves with different depths. The plurality of grooves cooperate with the fixed grooves on the movable plate so that the plurality of tungsten wires do not overlap in the first direction.

[0011] Optionally, the pre-compression distance device further includes: A branching tube, wherein the branching tube is provided with a plurality of through holes for preventing ends of the plurality of tungsten filaments away from the fiber tube from overlapping in the first direction; The branching tube fixing block is provided on a side of the distance determining portion away from the fiber tube fixing portion and is used to fix the branching tube so as to fix the end of the tungsten wire away from the fiber tube.

[0012] Optionally, the pre-compression distance device further includes: A tension gauge is arranged on a side of the branch tube fixing block away from the fiber tube, and is used to apply an initial tensioning force to the tungsten wire to keep the tungsten wire in a straight state.

[0013] The present application also provides a method for preloading a tungsten wire of a surgical instrument, which is applied to a preloading distance device. The preloading method includes: Obtaining a preset length of each of the tungsten wires; Controlling the movement of the corresponding moving block according to the different preset lengths to define the corresponding length of the tungsten wire; Inserting ends of the plurality of tungsten wires away from the fiber tube into the through holes of the branch tube respectively; Inserting the fiber tube into the fiber tube fixing portion, and placing a plurality of tungsten wires in the corresponding fixing grooves of the moving block; Moving the steel tube on each tungsten wire along a first direction from the tungsten wire to the fiber tube until it contacts the limiting groove; Each of the steel tubes was pre-pressed to determine the length of each tungsten wire.

[0014] Optionally, before pre-pressing each of the steel pipes, the pre-pressing method further comprises: Tension is applied to each of the plurality of tungsten wires through a strain gauge, so that each of the tungsten wires is in a tensioned state.

[0015] The pre-stress distance device for tungsten wire provided in the embodiment of the present application is applied to surgical instruments. The pre-stress distance device includes a base, a fiber tube fixing portion and a distance determining portion. The fiber tube fixing portion is arranged on the base and is used to fix the fiber tube. The distance determining portion includes a plurality of moving blocks arranged at intervals from each other, and each moving block is provided with a plurality of fixing grooves to fix a plurality of tungsten wires, wherein the plurality of moving blocks can define a plurality of tungsten wires of different lengths. The embodiment of the present application defines the length of the corresponding tungsten wire by the position of each moving block, and thus can simultaneously define the preset lengths of a plurality of tungsten wires according to a plurality of moving blocks, and by setting the tungsten wires in the corresponding fixing grooves, the plurality of tungsten wires can be pre-stressed without the need to adjust the distance determining portion multiple times, thereby improving processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a tungsten wire pre-compression distance device provided in an embodiment of the present application; Figure 2 for Figure 1 A front view of the preload distance device for the tungsten wire shown; Figure 3 for Figure 1 A schematic structural diagram of a distance determining portion in a tungsten wire pre-compression distance device along a first direction is shown; Figure 4 for Figure 1 A schematic structural diagram of a distance determining portion in a tungsten wire pre-compression distance device along a second direction is shown; Figure 5 for Figure 1 A top view of a distance determining portion in a preload distance device for a tungsten wire is shown; Figure 6 for Figure 1 A schematic structural diagram of the fiber tube fixing portion in the tungsten wire pre-compression distance device shown; Figure 7 A schematic flow chart of a method for pre-stressing a tungsten wire of a surgical instrument provided in an embodiment of the present application.

[0017] Description of reference numerals: 100. Preload distance device; 10. Base; 20. Fiber tube fixing portion; 30. Distance determination portion; 40. Movable wire distributor; 50. Branching tube; 60. Branching tube fixing block; 70. Tensile gauge holder; 80. Tungsten wire clamp; 90. Steel tube; 210, fixed part; 220, movable part; 200. Surgical instruments; 201. Fiber tube; 202. Tungsten wire; 310, first moving block; 320, second moving block; 330, third moving block; 340, first fixed block; 350, second fixed block; 360, positioning pin; 370, connecting member; 380, spring; 390, fixing slot; 371, first connecting member; 372, second connecting member; 373, third connecting member; 381, first spring; 382, second spring; 383, third spring; 301, first nut; 302, second nut; 303, third nut. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention will be described in detail below.

[0019] See also Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the tungsten wire pre-compression distance device provided in an embodiment of the present application. Figure 2 for Figure 1 The front view of the tungsten wire pre-stressing distance device shown. The embodiment of the present application provides a tungsten wire 202 pre-stressing distance device 100, which is applied to a surgical instrument 200. The surgical instrument 200 includes a fiber tube 201 and a tungsten wire 202 connected together. The pre-stressing distance device 100 includes: a base 10, a fiber tube fixing portion 20 and a distance determining portion 30. The fiber tube fixing portion 20 is arranged on the base 10 and is used to fix the fiber tube 201; the distance determining portion 30 includes a plurality of movable blocks arranged at intervals, each movable block is provided with a plurality of fixing grooves 390 to fix a plurality of tungsten wires 202, wherein the plurality of movable blocks can define a plurality of tungsten wires 202 of different lengths. The embodiment of the present application defines the length of the corresponding tungsten wire 202 by the position of each movable block. Therefore, after the preset lengths of the plurality of tungsten wires 202 are simultaneously defined by the plurality of movable blocks, and the tungsten wires 202 are arranged in the corresponding fixing grooves 390, the plurality of tungsten wires 202 can be pre-stressed without the need to adjust the distance determining portion 30 multiple times, thereby improving the processing efficiency.

[0020] Each tungsten filament 202 passes through a plurality of movable blocks in sequence, and a steel tube 90 is provided on each tungsten filament 202. Exemplarily, the tungsten filaments 202 include a first tungsten filament and a second tungsten filament for controlling movement along a first direction, a third tungsten filament and a fourth tungsten filament for controlling movement along a second direction, and a fifth tungsten filament and a sixth tungsten filament for controlling movement along a third direction. The preset length of the first tungsten filament is the same as the preset length of the second tungsten filament, the preset length of the third tungsten filament is the same as the preset length of the fourth tungsten filament, and the preset length of the fifth tungsten filament is the same as the preset length of the sixth tungsten filament, and the preset lengths of the first tungsten filament, the third tungsten filament, and the fifth tungsten filament are different.

[0021] Each moving block is provided with a limiting groove whose notch size is smaller than the size of the steel tube 90. When the steel tube 90 on each tungsten wire 202 moves in the first direction along the tungsten wire 202 to the fiber tube 201 until it hits the limiting groove, the corresponding moving block limits the length of the corresponding tungsten wire 202.

[0022] It is understandable that one moving block is used to limit the length of multiple tungsten wires 202 moving in the same direction, and the position of each moving block on the base 10 is adjusted according to the preset length of each tungsten wire 202 .

[0023] Please continue reading Figures 3 to 5 , Figure 3 for Figure 1 The schematic diagram of the structure of the distance determining part in the pre-pressed distance device of the tungsten wire along the first direction is shown. Figure 4 for Figure 1 The schematic diagram of the structure of the distance determining part in the pre-pressed distance device of the tungsten wire along the second direction is shown. Figure 5 for Figure 1 The top view of the distance determining portion of the tungsten filament preload distance device shown in FIG. In the first direction from the tungsten filament 202 to the fiber tube 201, multiple movable blocks include a first movable block 310, a second movable block 320, and a third movable block 330, which are arranged in sequence. The first movable block 310 is provided with a limiting groove for defining the lengths of the first and second tungsten filaments, the second movable block 320 is provided with a limiting groove for defining the lengths of the third and fourth tungsten filaments, and the third movable block 330 is provided with a limiting groove for defining the lengths of the fifth and sixth tungsten filaments. That is, when the steel tube 90 on the first and second tungsten filaments moves along the first direction until it abuts the limiting groove on the first movable block 310, the first movable block 310 defines the preload length of the first and second tungsten filaments. When the steel tube 90 on the third and fourth tungsten filaments moves along the first direction until it abuts the limiting groove on the second movable block 320, the second movable block 320 defines the preload length of the third and fourth tungsten filaments. When the upper steel tubes 90 of the fifth tungsten wire and the sixth tungsten wire move along the first direction to abut against the limiting groove on the third moving block 330 , the third moving block 330 limits the pre-compression length of the fifth tungsten wire and the sixth tungsten wire.

[0024] Exemplarily, the first movable block 310 is sequentially provided with a first fixed slot, a first limiting slot, and a second fixed slot, wherein the slot size of the first fixed slot and the slot size of the second fixed slot are both larger than the slot size of the first limiting slot. The second movable block 320 is sequentially provided with a third fixed slot, a second limiting slot, a fourth fixed slot, and a third limiting slot, wherein the slot size of the third fixed slot and the slot size of the fourth fixed slot are both larger than the slot sizes of the second limiting slot and the third limiting slot. The third movable block 330 is sequentially provided with a third limiting slot, a fifth fixed slot, a sixth fixed slot, a fourth limiting slot, and a seventh fixed slot 390, wherein the slot sizes of the third limiting slot, the fifth fixed slot, the sixth fixed slot, the fourth limiting slot, and the seventh fixed slot 390 can be equal, that is, the slot sizes are all larger than the size of the tungsten filament 202 and smaller than the size of the steel pipe 90, so as to stably fix all the tungsten filaments 202 and allow the fifth and sixth tungsten filaments to be limited to a preset length.

[0025] The first tungsten wire and the second tungsten wire pass through the sixth fixing groove, the fourth fixing groove and the first limiting groove in sequence. Figures 3 to 5 , I will not go into details here.

[0026] It should be noted that the preset length of each tungsten wire 202 is calculated based on the instrument model. Considering the current structure of the surgical instrument 200, the tungsten wire 202 in this application is divided into three lengths. The multiple movable blocks in the distance fixing portion are moved to corresponding positions according to the three preset lengths. The corresponding relationship between the corresponding positions of the multiple movable blocks on the base 10 and the preset lengths is derived from extensive data experiments and simulation verification.

[0027] In addition, it is understandable that since the motor will apply a cyclic tension to the tungsten wire 202 when stretching the wire in the subsequent steps to offset the length of the tungsten wire 202 stretched after long-term use of the device, the actual pre-stressed distance of the tungsten wire 202 may be shorter than the theoretical distance.

[0028] The distance determining unit 30 also includes a first fixed block 340, a second fixed block 350, a positioning pin 360, and a plurality of connecting members. The first fixed block 340 is fixedly mounted on the base 10 and is located on the side of the moving block away from the fiber tube 201. The second fixed block 350 is fixedly mounted on the base 10 and is located on the side of the moving block close to the fiber tube 201. One end of the positioning pin 360 is connected to the first fixed block 340, and the other end of the positioning pin 360 is connected to the second fixed block 350 after passing through the plurality of moving blocks in sequence. One end of each connecting member 370 is connected to the second fixed block 350 after passing through the plurality of moving blocks in sequence, and the other end of the connecting member 370 is connected to a nut after passing through the first fixed block 340. One connecting member 370 is connected to one moving block and drives the corresponding moving block to move by turning the nut. Among them, the first fixed block 340 and the second fixed block 350 are used to fix the connecting member 370 and the positioning pin 360.

[0029] The distance determining unit 30 also includes multiple springs 380, one spring 380 being mounted on each connector 370. Each spring 380 mounted on different connectors 370 has a different length and is in a non-compressed state. In some embodiments, each movable block is provided with an abutment wall for contacting the spring 380. This ensures that when adjusting a nut individually, only the corresponding movable block moves, while the other movable blocks remain stationary. This allows for quicker and more convenient adjustment of the preload distance. Furthermore, the provision of springs 380 on the connectors allows the movable plate to remain stationary after the preload distance has been adjusted.

[0030] Exemplarily, the plurality of connectors 370 include a first connector 371, a second connector 372, and a third connector 373; the plurality of springs 380 include a first spring 381, a second spring 382, and a third spring 383; and the plurality of nuts include a first nut 301, a second nut 302, and a third nut 303. Specifically, the first connector 371 is connected to the first nut 301, the first spring 381 is disposed on the first connector 371, and an abutting wall is disposed on the first movable plate to abut against the first spring 381, thereby enabling the first movable plate to move when the first nut 301 is adjusted. The second connector 372 is connected to the second nut 302, the second spring 382 is disposed on the second connector 372, and an abutting wall is disposed on the second movable plate to abut against the second spring 382, thereby enabling the second movable plate to move when the second nut 302 is adjusted. The third connecting member 373 is connected to the third nut 303, and the third spring 383 is disposed on the third connecting member 373. The third movable plate is provided with an abutting wall that abuts the third spring 383, thereby enabling the third movable plate to move when the third nut 303 is adjusted. The coordination of multiple nuts, multiple connecting members, and multiple springs allows for the individual adjustment of multiple movable plates, allowing for efficient and rapid position adjustment. Furthermore, the structure is simple and compact, requiring little floor space.

[0031] In some embodiments, the preload distance device 100 further includes: a movable divider 40, which is arranged on a side of the distance determining part 30 close to the fiber tube fixing part 20, and the movable divider 40 is provided with a plurality of grooves with different groove depths, and the plurality of grooves cooperate with the fixed grooves 390 on the movable plate so that the plurality of tungsten wires 202 do not overlap in the first direction.

[0032] In some embodiments, the preload distance device 100 further includes a branching tube 50 and a branching tube fixing block 60. The branching tube 50 is provided with a plurality of through holes for ensuring that the ends of the plurality of tungsten filaments 202 away from the fiber tube 201 do not overlap in the first direction. The branching tube 50 is disposed on a side of the distance determining portion 30 away from the fiber tube fixing portion 20 and is used to fix the branching tube 50 so that the ends of the tungsten filaments 202 away from the fiber tube 201 are fixed.

[0033] In some embodiments, the preload distance device 100 further includes: a tungsten wire clamp 80 disposed on a side of the branch tube fixing block 60 away from the fiber tube 201 , for clamping the tungsten wire 202 .

[0034] In some embodiments, the prestressing distance device 100 further includes: a force gauge and a force gauge holder 70. The force gauge holder 70 is arranged on the side of the branch pipe fixing block 60 away from the fiber tube 201 and is used to fix the force gauge. The force gauge is used to apply an initial tensioning force to the tungsten wire 202 before prestressing to keep the tungsten wire 202 in a straight state.

[0035] Please continue reading Figure 6 , Figure 6 for Figure 1 The schematic diagram of the structure of the fiber tube fixing part in the tungsten wire pre-compression distance device shown in FIG. 2 is a diagram showing the structure of the fiber tube fixing part 20, wherein the fiber tube fixing part 20 includes a fixing part 210 and a movable part 220, wherein the fixing part 210 is used to fix the fiber tube 201, and the movable part 220 is used to adjust the position of the fiber tube fixing part 20, specifically, the fiber tube 201 can be moved relative to the base 10 according to the length of the end sleeve of the fiber tube 201 of the surgical instrument 200 to better fix the fiber tube 201.

[0036] Please continue reading Figure 7 , Figure 7 This is a schematic diagram of a process for preloading a tungsten wire of a surgical instrument provided in an embodiment of the present application. This embodiment of the present application also provides a preloading method for a tungsten wire of a surgical instrument, which is applied to a preloading distance device. The preloading method includes the following process: 101. Obtain the preset length of each tungsten wire.

[0037] 102. Control the movement of the corresponding moving block according to different preset lengths to define the length of the corresponding tungsten wire.

[0038] 103. Insert the ends of the multiple tungsten wires away from the fiber tube into the through holes of the distribution tube respectively.

[0039] 104. Insert the fiber tube into the fiber tube fixing portion, and place multiple tungsten wires in corresponding fixing grooves of the moving block.

[0040] 105. Move the steel tube on each tungsten wire along the first direction from the tungsten wire to the fiber tube until it hits the limiting groove.

[0041] 106. Pre-press each steel tube to determine the length of each tungsten wire.

[0042] Before pre-pressing each steel tube, the pre-pressing method also includes applying tension to multiple tungsten wires using a strain gauge to keep each tungsten wire taut. In this state, the steel tube is pre-pressed, and then the crimping machine performs the final press. Finally, the pre-pressed portion is trimmed off before the motor is stretched.

[0043] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A tungsten wire preload distance device (100), applied to a surgical instrument (200), characterized in that: The surgical instrument (200) comprises a fiber tube (201) and a tungsten wire (202) that are connected and arranged, and the preload distance device (100) comprises: Base (10); a fiber tube fixing portion (20), the fiber tube fixing portion (20) being arranged on the base (10) and being used to fix the fiber tube (201); A distance determining unit (30) includes a plurality of movable blocks spaced apart from each other, each movable block being provided with a plurality of fixing slots (390) for fixing the plurality of tungsten wires (202), wherein the plurality of movable blocks can define a plurality of tungsten wires (202) of different lengths.

2. The preload distance device (100) according to claim 1, characterized in that: Each of the tungsten wires passes through the plurality of moving blocks in sequence, and a steel tube (90) is provided on each of the tungsten wires; Each of the moving blocks is provided with a limiting groove whose notch size is smaller than the size of the steel tube (90). When the steel tube (90) on each of the tungsten wires moves in a first direction along the tungsten wire (202) to the fiber tube (201) until it contacts the limiting groove, the corresponding moving block limits the length of the corresponding tungsten wire (202).

3. The preload distance device (100) according to claim 2, characterized in that: One of the moving blocks is used to limit the length of a plurality of tungsten wires (202) moving in the same direction, and the position of each moving block on the base (10) is adjusted according to the preset length of each tungsten wire (202).

4. The preload distance device (100) according to claim 3, characterized in that: The distance determination unit (30) further includes: a first fixed block (340), the first fixed block (340) being fixedly disposed on the base (10) and located on a side of the movable block away from the fiber tube (201); a second fixed block (350), the second fixed block (350) being fixedly disposed on the base (10) and located on a side of the movable block close to the fiber tube (201); a positioning pin (360), one end of the positioning pin (360) being connected to the first fixed block (340), and the other end of the positioning pin (360) being connected to the second fixed block (350) after passing through the plurality of movable blocks in sequence; A plurality of connecting members (370), one end of each connecting member (370) passes through the plurality of movable blocks in sequence and is connected to the second fixed block (350), the other end of the connecting member (370) passes through the first fixed block (340) and is connected to a nut, and one connecting member (370) is connected to one movable block and drives the corresponding movable block to move by turning the nut.

5. The preload distance device (100) according to claim 4, characterized in that: The distance determination unit (30) further includes: A plurality of springs (380), one spring (380) is arranged on one connecting member, each spring (380) has a different length and each spring (380) is in a non-compressed state.

6. The preload distance device (100) according to any one of claims 1 to 5, characterized in that: The pre-compression distance device (100) further comprises: A movable wire divider (40) is provided on a side of the distance determining portion (30) close to the fiber tube fixing portion (20), and a plurality of grooves with different groove depths are provided on the movable wire divider (40), and the plurality of grooves cooperate with the fixing grooves (390) on the movable plate so that the plurality of tungsten wires (202) do not overlap in the first direction.

7. The preload distance device (100) according to claim 6, characterized in that: The pre-compression distance device (100) further includes: A branching tube (50), wherein a plurality of through holes are provided on the branching tube (50) for preventing ends of the plurality of tungsten wires (202) away from the fiber tube (201) from overlapping in the first direction; A branch pipe fixing block (60), the branch pipe being arranged on a side of the distance determining portion (30) away from the fiber tube fixing portion (20), and being used to fix the branch pipe (50) so as to fix one end of the tungsten wire (202) away from the fiber tube (201).

8. The preload distance device (100) according to claim 7, characterized in that: The pre-compression distance device (100) further comprises: A tension gauge is provided on a side of the branch pipe fixing block (60) away from the fiber tube, and is used to apply an initial tensioning force to the tungsten wire so that the tungsten wire is in a straightened state.

9. A method for preloading a tungsten wire of a surgical instrument, applied to a preloading distance device, characterized in that: The preloading method comprises: Obtaining a preset length of each of the tungsten wires; Controlling the movement of the corresponding moving block according to the different preset lengths to define the corresponding length of the tungsten wire; Insert the ends of the multiple tungsten wires away from the fiber tube into the through holes of the branch tube respectively; Inserting the fiber tube into the fiber tube fixing portion, and placing a plurality of tungsten wires in the corresponding fixing grooves of the moving block; Moving the steel tube on each tungsten wire along a first direction from the tungsten wire to the fiber tube until it contacts the limiting groove; Each of the steel tubes was pre-pressed to determine the length of each tungsten wire.

10. The pre-pressing method according to claim 9, characterized in that: Before pre-pressing each of the steel pipes, the pre-pressing method further comprises: Tension is applied to each of the plurality of tungsten wires through a strain gauge, so that each of the tungsten wires is in a tensioned state.

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