Multifunctional traction reduction frame for treating tibia shaft fracture through intramedullary nail

Abstract

The utility model discloses a multifunctional traction reduction frame for treating tibia shaft fracture through an intramedullary nail, and the frame comprises a bottom frame which comprises a bottom rod; the lifting frame is mounted on the bottom frame and can lift and adjust the position relative to the bottom frame; the upper end of the supporting rod is rotatably and movably mounted on the lifting frame along the horizontal axis; the telescopic rod is connected with the supporting rod and can movably adjust the position along the length direction of the supporting rod; the upper end of the supporting rod is hinged to the supporting rod, and the lower end is provided with a linkage shaft. The clamping block is provided with a first through hole allowing the linkage shaft to be inserted therein, is installed on the bottom rod and can adjust the position in the length direction of the bottom rod. According to the utility model, through the lifting adjusting function of the lifting frame, the device can adapt to tibia shaft fractures of different patients and different parts, the telescopic rod is designed to allow the position to be movably adjusted along the length direction of the supporting rod so as to adapt to the requirements of different patients, and the supporting rod and the clamping block are matched for use, so that a stable supporting point is provided; the fracture end can be effectively maintained after restoration, and restoration loss is prevented.

Description

Technical Field

[0001] This utility model relates to the field of medical supplies technology, and in particular, to a multifunctional traction reduction frame for intramedullary nailing to treat tibial shaft fractures. Background Technology

[0002] Currently, there are two surgical approaches available for treating tibial shaft fractures using intramedullary nailing. One is the traditional subosseous approach, primarily suitable for fractures of the middle third of the tibial shaft. This procedure requires traction reduction with the knee in extreme flexion before inserting the intramedullary nail for fixation. Currently, it is often performed with two assistants assisting in knee flexion while simultaneously tractioning the ankle to expose the nail insertion point and temporarily reduce the fracture ends. However, this method cannot achieve continuous and balanced traction or maintain the reduced state during flexion and traction, making it prone to loss of reduction, leading to repeated reduction attempts, repeated fluoroscopy, and prolonged surgical time. Another surgical approach is the suprasternal approach with the knee in a semi-extended position. This is mainly suitable for tibial shaft fractures of the proximal and distal tibial shafts, and can also be used to treat fractures of the middle third of the tibial shaft. This procedure uses a semi-extended position, and currently there is no dedicated knee positioning pad; patients need to elevate the knee joint using sterile towels or similar materials. Furthermore, an assistant is required to traction the distal fracture fragments during the procedure to maintain reduction and facilitate the insertion of an intramedullary nail for fixation. Both of these surgical methods currently suffer from the drawbacks of requiring manual maintenance of position and traction reduction, frequently resulting in loss of position and fracture reduction. There are also no dedicated tools for maintaining position and reducing / reducing fractures. This invention addresses the problems of positional fixation in both surgical methods and the need for continuous traction reduction and maintenance of the fracture fragments using a multifunctional traction reduction frame. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a multifunctional traction reduction frame for intramedullary nailing of tibial shaft fractures.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A multifunctional traction reduction frame for intramedullary nailing of tibial shaft fractures includes: a base frame, including a base rod extending in a front-rear direction; a lifting frame, installed on the base frame and adjustable in position relative to the base frame; a support rod, the upper end of which is rotatably mounted on the lifting frame along a horizontal axis; a telescopic rod, connected to the support rod and adjustable in position along the length of the support rod; a support rod, the upper end of which is hinged to the support rod, and the lower end of which is provided with a linkage shaft; and a locking block, having a first through hole for the linkage shaft to be inserted, installed on the base rod, adjustable in position along the length of the base rod, and providing support force to the support rod.

[0006] Furthermore, the bottom rod is provided with a strip-shaped hole, the linkage shaft is inserted into the strip-shaped hole and can move in the front-back direction within the strip-shaped hole, the locking block includes a top plate and two side plates connected to the left and right sides of the top plate, the top plate is located above the bottom rod, and the first through hole is provided in the side plate.

[0007] Furthermore, the bottom of the top plate is provided with insert teeth, and the upper end of the bottom rod is provided with tooth grooves for inserting the insert teeth. The tooth grooves are arranged along the length direction of the bottom rod so that the insert teeth on the top plate can be inserted into the tooth grooves at different positions to achieve position adjustment.

[0008] Furthermore, the first perforation is a waist-shaped hole with its length direction vertical.

[0009] Furthermore, the support rod has a first insertion hole at its center, and a first connecting plate on its outer side. The first connecting plate has a threaded hole, and the telescopic rod is inserted into the first insertion hole and can slide along the first insertion hole. The telescopic rod has a second connecting plate on its outer side corresponding to the first connecting plate. The second connecting plate has a second through hole aligned with the threaded hole, and an adjusting screw passes through the second through hole. One end of the adjusting screw is threadedly connected to the threaded hole to adjust the length of the telescopic rod extending out of the first insertion hole.

[0010] Furthermore, the adjusting screw includes a rod head, a rotating positioning shaft, and a threaded shaft, which are coaxially connected in sequence. The rotating positioning shaft is adapted to the second through hole and can rotate within the second through hole. The outer circumferential contour of the rod head is larger than that of the second through hole, and the threaded shaft is threadedly connected to the threaded hole.

[0011] Furthermore, the base rod, support rod, telescopic rod, support rod, and locking block are provided in two sets symmetrically on the left and right sides.

[0012] Furthermore, one end of each of the two bottom rods is connected and fixed by a connecting rod. The connecting rod has an upwardly extending vertical rod. The lifting frame includes a round rod and a lifting rod. The lifting rod is movably mounted on the vertical rod and can be fixed in position by fasteners. The round rod is connected to the top of the lifting rod. The upper end of the support rod has a rotating hole to be rotatably fitted onto the round rod.

[0013] Furthermore, the end of the round rod extends out of the rotating hole and is fitted with a cylinder. A set screw is connected to the peripheral wall of the cylinder, and the set screw abuts against the round rod. A bone needle plate is provided on the peripheral wall of the cylinder, and the bone needle plate is provided with bone needle holes.

[0014] Furthermore, the support rod is located between the vertical rod and the cylinder on the corresponding side to achieve axial positioning of the support rod.

[0015] This utility model has the following beneficial effects:

[0016] The lifting and adjusting function of the lifting frame can accommodate different patients and different tibial shaft fractures. The design of the telescopic rod allows for adjustment along the length of the support rod to meet the needs of different patients. The cooperation between the support rod and the locking block provides a stable support point, which can effectively maintain the fracture ends after reduction and prevent loss of reduction.

[0017] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 This is an isometric view of the overall structure of this utility model;

[0020] Figure 2 yes Figure 1 A schematic diagram of the decomposed state structure;

[0021] Figure 3 This is a schematic diagram of the local structure in the decomposed state;

[0022] Figure 4 This is a structural diagram when the position of the locking block is fixed;

[0023] Figure 5 This is a schematic diagram showing the state of the locking block during adjustment.

[0024] Figure 6 yes Figure 5 Enlarged view of point A;

[0025] Figure 7 This is a schematic diagram of the disassembled structure of the telescopic rod and the support rod;

[0026] Figure 8 This is a schematic diagram of the adjusting screw.

[0027] Legend:

[0028] Base frame 100, base rod 110, strip hole 111, toothed groove 112, connecting rod 120, vertical rod 130, second insertion hole 131, first connecting hole 132;

[0029] Lifting frame 200, round rod 210, lifting rod 220, second connecting hole 221;

[0030] Support rod 300, first insertion hole 310, first connecting plate 320, threaded hole 321, rotating hole 330, hinge lug 340;

[0031] Telescopic rod 400, second connecting plate 410, second through hole 411;

[0032] Support rod 500, linkage shaft 510;

[0033] Positioning block 600, first through hole 610, top plate 620, insert tooth 621, side plate 630;

[0034] Adjusting screw 700, screw head 710, rotating positioning shaft 720, threaded shaft 730;

[0035] 800 cylinder, 810 set screw. Detailed Implementation

[0036] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0039] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0040] Please refer to Figure 1 and Figure 2The present invention provides a preferred embodiment of a multifunctional traction reduction frame for intramedullary nailing of tibial shaft fractures, comprising a base frame 100, a lifting frame 200, a support rod 300, a telescopic rod 400, a support rod 500, and a locking block 600.

[0041] The base frame 100 includes a base rod 110 extending in the front-rear direction.

[0042] The lifting frame 200 is installed on the base frame 100 and can be raised and lowered relative to the base frame 100 to adjust its position, thereby achieving height adjustment to meet the needs of patients of different body types and improve comfort.

[0043] The upper end of the support rod 300 is rotatably mounted on the lifting frame 200 along the horizontal axis, thereby achieving angle adjustment to accommodate different needs and body shapes of patients. The support rod 300 extends obliquely in the front-back direction; specifically, the front end of the support rod 300 is lower than the rear end, so the rear end of the support rod 300 is the upper end.

[0044] The telescopic rod 400 is connected to the support rod 300 and can be moved and adjusted along the length of the support rod 300 to achieve length adjustment to meet the needs of patients of different body types.

[0045] The upper end of the support rod 500 is hinged to the support rod 300, thereby achieving support at different angles to accommodate different angles of the support rod 300. A linkage shaft 510 is provided at the lower end of the support rod 500.

[0046] The locking block 600 is provided with a first through hole 610 for the linkage shaft 510 to be inserted. The locking block 600 is installed on the base rod 110. The locking block 600 can be adjusted in position along the length of the base rod 110. After the position is adjusted and fixed, the locking block 600 can provide a supporting force to the support rod 500, thereby adapting to different angles of the support rod 500, so as to achieve support for the support rod 300 at different angles.

[0047] This utility model provides a multifunctional traction reduction frame for intramedullary nailing of tibial shaft fractures. Through the lifting and adjusting function of the lifting frame 200, it can adapt to different patients and different locations of tibial shaft fractures. The design of the telescopic rod 400 allows for position adjustment along the length of the support rod 300 to meet the needs of different patients. The cooperation between the support rod 500 and the locking block 600 provides a stable support point, which can effectively maintain the fracture ends after reduction and prevent loss of reduction.

[0048] Reference Figures 1 to 3In some embodiments of this utility model, the bottom rod 110 is provided with a strip-shaped hole 111. The linkage shaft 510 is partially inserted into the strip-shaped hole 111 and can move in the front-back direction within the strip-shaped hole 111. Thus, the strip-shaped hole 111 is used to guide the movement of the linkage shaft 510. The linkage shaft 510 is a round shaft, which can rotate along its own axis while moving along the strip-shaped hole 111. The locking block 600 includes a top plate 620 and two side plates 630 connected to the left and right sides of the top plate 620. The top plate 620 is located above the bottom rod 110. The first through hole 610 is provided in the side plate 630, so that the bottom rod 110 is clamped between the two side plates 630, which plays a limiting and guiding role in adjusting the movement position of the locking block 600.

[0049] Reference Figures 1 to 3 In some embodiments of this utility model, the bottom of the top plate 620 is provided with insert teeth 621, and the upper end of the bottom rod 110 is provided with tooth grooves 112 for inserting the insert teeth 621. The tooth grooves 112 are arranged along the length direction of the bottom rod 110 so that the insert teeth 621 on the top plate 620 can be inserted into the tooth grooves 112 at different positions to achieve position adjustment. For example Figure 4 As shown, at this time, the inserter 621 is inserted into the tooth groove 112, and the locking block 600 is fixed in the front and rear horizontal directions. In addition, the base rod 110 supports the top plate 620. Therefore, when the force of the support rod 300 is transmitted to the locking block 600 through the support rod 500 and the linkage shaft 510, the locking block 600 will not move backward, and will provide stable support. When the position needs to be adjusted, the locking block 600 can be lifted, causing the inserter 621 to disengage from the tooth groove 112, achieving... Figure 5 and Figure 6 As shown in the diagram, the locking block 600 is unrestricted in its movement and can move freely. When it moves to the desired position, the locking block 600 is lowered so that the insert tooth 621 is inserted into the tooth groove 112 at the corresponding position, thereby achieving position adjustment and fixing of the adjusted position.

[0050] Reference Figure 3 and Figure 5In some embodiments of this utility model, the first through hole 610 is a waist-shaped hole with a vertical length direction. This allows the linkage shaft 510 to move relatively up and down within the first through hole 610 when the locking block 600 needs to be moved up and down to adjust its position, thus avoiding structural interference. This ensures that the linkage shaft 510 does not affect the up and down movement of the locking block 600 within a certain range, allowing the insert tooth 621 to disengage from and insert into the tooth groove 112. It is understood that the diameter of the linkage shaft 510 is adapted to the width of the first through hole 610. The linkage shaft 510 can move relatively up and down within the first through hole 610 and can also rotate relatively along its own axis. Furthermore, the insertion of the linkage shaft 510 into the first through hole 610 also limits the upward movement of the locking block 600, preventing it from disengaging from the base rod 110 and the linkage shaft 510, thereby improving the stability of the locking block 600 installation. Additionally, as... Figure 7 As shown, the bottom of the support rod 300 away from the lifting frame 200 is provided with a hinge lug 340 for the upper end of the support rod 500 to be hinged.

[0051] Reference Figure 7 In a further embodiment of this utility model, the support rod 300 has a first insertion hole 310 at its center, which extends along the length of the support rod 300. The end of the first insertion hole 310 away from the lifting frame 200 is open for the insertion of the telescopic rod 400. A first connecting plate 320 is provided on the outer side of the support rod 300, and a threaded hole 321 is provided on the first connecting plate 320. The telescopic rod 400 is inserted into the first insertion hole 310 and can slide along the first insertion hole 310. A second connecting plate 410 corresponding to the first connecting plate 320 is provided on the outer side of the telescopic rod 400. The second connecting plate 410 has a second through hole 411 aligned with the threaded hole 321. An adjusting screw 700 passes through the second through hole 411. One end of the adjusting screw 700 is threadedly connected to the threaded hole 321 to adjust the length of the telescopic rod 400 extending out of the first insertion hole 310. By turning the adjusting screw 700, the telescopic rod 400 can be extended or retracted. The adjustment is simple and convenient, and the position is stable after adjustment and will not easily float.

[0052] like Figure 4 As shown, during use, the patient's inner knee rests on the round rod 210. The end of the telescopic rod 400 away from the round rod is provided with a bone pin plate 420. The bone pin plate 420 is provided with a connecting hole, and a rod 430 is inserted into the connecting hole. Two nuts are threaded onto the rod 430. The two nuts clamp and fix the bone pin plate 420. A bone nail 431 is inserted through the end of the rod 430. The bone nail 431 is used to embed into the human bone.

[0053] Reference Figure 8In a further embodiment of this utility model, the adjusting screw 700 includes a rod head 710, a rotating positioning shaft 720, and a threaded shaft 730. The rod head 710, the rotating positioning shaft 720, and the threaded shaft 730 are coaxially connected in sequence. The rotating positioning shaft 720 is adapted to the second through hole 411 and can rotate within the second through hole 411. The cooperation between the rotating positioning shaft 720 and the second through hole 411 achieves centering and limiting of the adjusting screw 700, so that the position of the adjusting screw 700 will not float arbitrarily. During installation, the threaded shaft 730 can be aligned with the threaded hole 321, which is convenient for installation. The outer circumference of the rod head 710 is larger than that of the second through hole 411, thus preventing the rod head 710 from passing through the second through hole 411. The rod head 710 can drive the second connecting plate 410 to move towards the support rod 300. When the rod head 710 retracts, the telescopic rod 400 can extend until the second connecting plate 410 abuts against the rod head 710. The threaded shaft 730 is threadedly connected to the threaded hole 321, thereby enabling the length to be adjusted by screwing the thread.

[0054] Reference Figure 1 and Figure 2 In a further embodiment of this utility model, two sets of base rod 110, support rod 300, telescopic rod 400, support rod 500 and locking block 600 are symmetrically arranged on the left and right sides, thereby providing multi-position stable support and improving the support stability of base frame 100 and lifting frame 200.

[0055] Reference Figure 1 and Figure 2 In a further embodiment of this utility model, one end of each of the two bottom rods 110 is connected and fixed via a connecting rod 120. Specifically, the rear ends of the two bottom rods 110 are connected and fixed via a connecting rod 120. The connecting rod 120 has an upwardly extending vertical rod 130. The lifting frame 200 includes a round rod 210 and a lifting rod 220. The lifting rod 220 is movably mounted on the vertical rod 130 and its position can be fixed by fasteners. The round rod 210 is connected to the top of the lifting rod 220. The upper end of the support rod 300 has a rotating hole 330 to rotatably fit onto the round rod 210. The round rod 210 provides a structure for the support rod 300 to be rotatably mounted. The lifting position is adjusted by the cooperation of the vertical rod 130 and the lifting rod 220. To improve stability, two sets of vertical rods 130 and lifting rods 220 are provided.

[0056] Specifically, the vertical rod 130 is provided with a second insertion hole 131 with an opening at the upper end, and the vertical rod 130 has a plurality of first connecting holes 132 on its peripheral wall. The lifting rod 220 is inserted into the second insertion hole 131 and can move up and down. The lifting rod 220 has a second connecting hole 221 on its peripheral wall. The second connecting hole 221 can be aligned with the first connecting holes 132 at different heights and fasteners can be installed to realize the lifting adjustment and position fixation of the lifting rod 220. The second connecting hole 221 can be aligned with the first connecting holes 132 at different heights to realize height adjustment. The fasteners can realize the position fixation of the lifting rod 220. The fasteners can be bolts and nuts.

[0057] Reference Figure 1 and Figure 2 In a further embodiment of this utility model, the end of the round rod 210 extends out of the rotating hole 330 and is fitted with a cylinder 800. A set screw 810 is connected to the peripheral wall of the cylinder 800. The set screw 810 abuts against the round rod 210, thereby fixing the position of the cylinder 800.

[0058] Reference Figure 1 and Figure 2 In a further embodiment of this utility model, the support rod 300 is located between the vertical rod 130 and the cylinder 800 on the corresponding side to achieve axial positioning of the support rod 300. The vertical rod 130 and the cylinder 800 are provided with two sets to correspond to the positioning of the two support rods 300, so that the support rod 300 is fixed in the axial direction of the cylinder 210 and will not move freely in the axial direction of the cylinder 210.

[0059] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A multifunctional traction reduction frame for intramedullary nailing of tibial shaft fractures, characterized in that, The utility model provides a kind of adjustable support frame, including: Chassis (100), including the bottom bar (110) extending along front-back direction; Lifting frame (200), is installed in chassis (100) and can be adjusted position relative to chassis (100); Supporting rod (300), upper end is rotatably mounted along horizontal axis in lifting frame (200); Telescopic rod (400), is connected with supporting rod (300) and can be adjusted position along the length direction of supporting rod (300); Supporting rod (500), upper end is hinged with supporting rod (300), and lower end is equipped with a linkage shaft (510); Clamping block (600), is equipped with first perforation (610) for the insertion of linkage shaft (510), is installed in bottom bar (110), can be adjusted position along the length direction of bottom bar (110) and provides supporting force to supporting rod (500).

2. The multi-functional distraction / reduction frame for treatment of a shaft fracture of the tibia with an intramedullary nail according to claim 1, characterized in that The bottom bar (110) is provided with a strip-shaped hole (111), and the linkage shaft (510) is partially inserted into the strip-shaped hole (111) and can move in the strip-shaped hole (111) along the front-back direction. The clamping block (600) includes a top plate (620) and two side plates (630) connected to the left and right sides of the top plate (620). The top plate (620) is located above the bottom bar (110), and the first perforation (610) is provided in the side plates (630).

3. The multi-functional distraction / reduction frame for treatment of a shaft fracture of the tibia with an intramedullary nail according to claim 2, characterized in that The bottom of the top plate (620) is provided with a pinion (621), and the upper end of the bottom bar (110) is provided with a gear slot (112) for the insertion of the pinion (621). The gear slots (112) are arranged along the length direction of the bottom bar (110) to allow the pinion (621) on the top plate (620) to be inserted into different gear slots (112) to achieve position adjustment.

4. The multi-functional distraction / reduction frame for treatment of a shaft fracture of the tibia with an intramedullary nail according to claim 3, characterized in that The first perforation (610) is a waist-shaped hole with a vertical length direction.

5. The multi-functional distraction / reduction tower for treatment of a shaft fracture of the tibia with an intramedullary nail according to claim 1, characterized in that The supporting rod (300) is provided with a first insertion hole (310) in the center, and a first connecting plate (320) is provided on the outside of the supporting rod (300). The first connecting plate (320) is provided with a threaded hole (321). The telescopic rod (400) is inserted into the first insertion hole (310) and can slide along the first insertion hole (310). The telescopic rod (400) is provided with a second connecting plate (410) corresponding to the first connecting plate (320) on the outside. The second connecting plate (410) is provided with a second perforation (411) aligned with the threaded hole (321). The second perforation (411) is provided with an adjusting screw (700). One end of the adjusting screw (700) is threadedly connected with the threaded hole (321) to adjust the length of the telescopic rod (400) extending out of the first insertion hole (310).

6. The multi-functional distraction / reduction frame for treatment of a shaft fracture of the tibia with an intramedullary nail according to claim 5, characterized in that The adjusting screw (700) includes a rod head (710), a rotating positioning shaft (720), and a threaded shaft (730), which are coaxially connected in sequence. The rotating positioning shaft (720) is adapted to the second perforation (411) and can rotate in the second perforation (411). The outer contour of the rod head (710) is larger than the second perforation (411). The threaded shaft (730) is threadedly connected with the threaded hole (321).

7. The intramedullary nailing treatment tibial shaft fracture multifunctional traction reduction frame according to claim 1, characterized in that, The bottom rod (110), the supporting rod (300), the telescopic rod (400), the supporting rod (500) and the clamping block (600) are symmetrically provided with two groups.

8. The intramedullary nailing treatment tibial shaft fracture multifunctional traction reduction frame according to claim 7, characterized in that, One end of the left and right two bottom rods (110) is connected and fixed through a connecting rod (120), the connecting rod (120) is provided with an upward extending vertical rod (130), the lifting frame (200) comprises a round rod (210) and a lifting rod (220), the lifting rod (220) is movably installed on the vertical rod (130) and can be fixed in position through a fastener, the round rod (210) is connected to the top of the lifting rod (220), and the upper end of the supporting rod (300) is provided with a rotating hole (330) to rotatably and movably wrap the round rod (210).

9. The intramedullary nailing treatment tibial shaft fracture multifunctional traction reduction frame according to claim 8, characterized in that, The end of the round rod (210) extends out of the rotating hole (330) and is sleeved with a cylinder (800), the peripheral wall of the cylinder (800) is connected with a clamping screw (810), and the clamping screw (810) abuts against the round rod (210).

10. The multi-functional distraction / reduction frame for treatment of a shaft fracture of the tibia with an intramedullary nail according to claim 9, characterized in that The supporting rod (300) is located between the vertical rod (130) and the cylinder (800) on the corresponding side, so as to realize the axial limiting of the supporting rod (300).

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