Forearm operation reduction device
By designing a forearm surgical reduction device including a base, elbow support, reduction assembly, finger sleeve traction assembly and fixing assembly, the problems of reduction and radiation exposure in the prior art are solved, and efficient fracture reduction and reduction of radiation exposure are achieved.
Patent Information
- Application Number
- CN202421348057.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-06-13
AI Technical Summary
The lack of effective auxiliary devices in the prior art in forearm fracture surgery leads to difficulties in resetting and holding, and the frequent use of radiation for confirmation, increasing the risk of radiation exposure in patients.
A forearm surgical reset device is designed, including a base, an elbow support, a reset assembly, a finger sleeve traction assembly and a fixing assembly. The device supports the upper arm through an elbow support, the reset assembly performs positioning and adjustment of the forearm, the finger sleeve traction assembly performs traction of the fingers and wrist joints, and the fixing assembly fixes the device on the operating table to achieve reduction and control of the forearm fracture.
This device effectively realizes the reduction and control of forearm fractures, reduces the difficulty of the operator's operation during the operation and the frequency of radiation use, improves the success rate of the operation and reduces the risk of radiation exposure in the patient.
Smart Images
Figure CN222828781U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical instruments, in particular to a forearm surgery resetting device. Background Art
[0002] Forearm (including hand) fractures are common fractures. Currently, forearm fractures are still mainly treated by open reduction and internal fixation. With the development of medical technology, the concept of minimally invasive internal fixation is popular. For simple forearm fractures, minimally invasive surgery is feasible and can reduce the complication rate of infection and post-injury healing caused by incision. However, minimally invasive surgery requires good traction reduction and control of the fracture during the operation to meet the operator's subsequent operations. Currently, intraoperative reduction is still performed by the operator or assistant, and the reduction effect needs to be confirmed under fluoroscopy, which results in serious radiation exposure.
[0003] Therefore, there is an urgent need in the clinic for a device that can assist in the reduction, holding, and perspective of forearm fractures to solve the above technical problems. Utility Model Content
[0004] Based on the above, the purpose of the utility model is to provide a forearm surgical reduction device, which can achieve the reduction and holding functions of fractures in minimally invasive surgery of the forearm (including the hand).
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] Forearm surgical reduction device, comprising:
[0007] Base;
[0008] An elbow support member fixed on the base, wherein one side of the elbow support member is provided with an upper arm support portion for supporting the upper arm, and a through hole is provided in the upper arm support portion for the forearm to pass through;
[0009] A reset assembly, comprising a mounting seat, a resetter body and a forearm positioning piece, wherein the mounting seat is fixed on the base, the resetter body is adjustable in height direction on the mounting seat, the forearm positioning piece is arranged on the resetter body, and the forearm positioning piece is used to support and position the forearm;
[0010] A finger sleeve traction assembly, comprising a fixed pile, a traction rope and a finger sleeve, wherein the fixed pile is arranged on the base, one end of the traction rope is connected to the fixed pile, and the other end is connected to the finger sleeve, and the finger sleeve is used to be sleeved on the finger;
[0011] A fixing component is arranged on one side of the base and is used for fixing the base on the operating table.
[0012] In some possible embodiments, the mounting seat is provided with a guide column extending in the height direction, and a guide hole is provided in the reducer body, and the reducer body is slidably connected to the guide column through the guide hole; a padding block is detachably installed on the guide column, and the padding block is located between the reducer body and the mounting seat, and is used to adjust the height of the reducer body.
[0013] In some possible embodiments, the reset assembly also includes an adjustment handle for adjusting the position of the forearm positioning piece in a direction perpendicular to the forearm; the adjustment handle includes a screw and a knob portion provided at the rear end of the screw, a threaded hole is provided in the resetter body, the front end of the screw passes through the threaded hole and is fixedly connected to the forearm positioning piece, and the screw is threadedly matched with the threaded hole to drive the forearm positioning piece to move.
[0014] In some possible implementations, a plurality of first adjustment holes are arranged on the base along the extension direction of the forearm, and the mounting seat is adjustably fixed to the base through the first adjustment holes.
[0015] In some possible implementations, the upper arm support portion is a first arc-shaped groove capable of accommodating the upper arm; the forearm positioning member is provided with a second arc-shaped groove capable of accommodating the forearm; the first arc-shaped groove and the second arc-shaped groove are both openly arranged.
[0016] In some possible implementations, a plurality of second adjustment holes are arranged in an array on the base, and the fixing pile is fixed to the base in an adjustable manner through the second adjustment holes.
[0017] In some possible implementations, a hanging groove is provided on the upper portion of the fixing pile, and a connecting ring is provided at one end of the traction rope, and the connecting ring is hung in the hanging groove.
[0018] In some possible embodiments, the fixing assembly includes a first fixing member and a second fixing member, the first fixing member is configured to be fixedly connected to the edge of the operating table, the second fixing member is fixed to one side of the base, and the second fixing member is lockingly connected to the first fixing member to fix the base to the operating table.
[0019] In some possible embodiments, the first fixing member includes a clamping member, a connecting column and a first locking wrench, the clamping member is provided with a clamping groove, and the clamping groove is used to be clamped to the edge of the operating table; the connecting column is provided at the upper end of the clamping member, and is used to be connected to the second fixing member; the first locking wrench passes through the clamping member and can be pressed against the operating table, and is used to lock the clamping member to the operating table.
[0020] In some possible embodiments, the second fixing member includes a first clamping portion, a second clamping portion and a second locking wrench, the first clamping portion is integrally arranged on one side of the base, the second clamping portion is arranged opposite to the first clamping portion, and the second clamping portion and the first clamping portion are provided with clamping grooves on opposite sides thereof for clamping the connecting column; the second locking wrench passes through the second clamping portion and is threadedly connected to the first clamping portion, so as to enable the second clamping portion and the first clamping portion to lock the connecting column.
[0021] The beneficial effects of the utility model are:
[0022] The forearm surgery reduction device provided by the utility model has a base for providing a mounting platform for each component; an upper arm support part is provided on the elbow support member, which is convenient for placing and supporting the patient's upper arm for subsequent traction; at the same time, a through hole is provided on the elbow support member, through which the patient's forearm can pass; the reduction component includes a forearm positioning member, and the forearm can be supported and positioned by the forearm positioning member after extending from the through hole, and the reduction device body is adjustable in height direction on the base, and the height of the forearm positioning member can be adjusted, so as to facilitate the lifting of the forearm and realize the wrist flexion operation on the wrist joint; the finger sleeve traction component is installed on the base through a fixed pile, and the finger sleeve can be put on the patient's finger and tightened, which can play the function of traction of the finger and wrist joint, so that the fracture end is shortened and restored; the fixing component is used to fix the base on the edge of the operating table, so as to reduce the patient during the operation. The utility model realizes the reduction and holding functions of fractures in minimally invasive surgery of the forearm (including the hand), effectively ensures the reduction effect, improves the success rate of minimally invasive surgery of the forearm, and reduces radiation exposure. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 It is a structural schematic diagram of a forearm surgical reduction device provided by an embodiment of the utility model;
[0024] Figure 2 It is a schematic diagram of the forearm surgical reduction device provided by an embodiment of the utility model when it is applied to an arm;
[0025] Figure 3 It is a structural schematic diagram of the base and the second fixing member provided in an embodiment of the utility model;
[0026] Figure 4 It is a structural schematic diagram of an elbow support provided by an embodiment of the utility model;
[0027] Figure 5 It is a structural schematic diagram of a reset assembly provided by an embodiment of the utility model;
[0028] Figure 6 It is an exploded view of the mounting seat and the resetter body provided by the embodiment of the utility model;
[0029] Figure 7 It is a structural schematic diagram of a first fixing member provided in an embodiment of the utility model;
[0030] Figure 8 It is a structural schematic diagram of a finger sleeve traction assembly provided in an embodiment of the utility model.
[0031] In the figure:
[0032] 100, upper arm; 200, forearm;
[0033] 1. Base; 11. First adjustment hole; 12. Second adjustment hole;
[0034] 2. elbow support; 21. upper arm support; 22. through hole;
[0035] 3. Reset assembly; 31. Mounting seat; 311. Guide column; 32. Resetter body; 321. Guide hole; 322. Threaded hole; 33. Forearm positioning piece; 331. Second arc groove; 34. Heightening block; 35. Adjustment handle; 351. Screw rod; 352. Knob part;
[0036] 4. Finger sleeve traction assembly; 41. Fixed pile; 411. Hanging groove; 42. Traction rope; 43. Finger sleeve;
[0037] 5. Fixing assembly; 51. First fixing member; 511. Clamping member; 512. Connecting column; 513. First locking wrench; 52. Second fixing member; 521. First clamping portion; 522. Second clamping portion; 523. Second locking wrench. DETAILED DESCRIPTION
[0038] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.
[0039] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0040] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0041] In the description of this embodiment, the terms "upper", "lower", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplified operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.
[0042] like Figure 1-Figure 8As shown, this embodiment provides a forearm surgical reduction device, including a base 1, an elbow support 2, a reduction assembly 3, a plurality of groups of finger sleeve traction assemblies 4 and a fixing assembly 5. The base 1 can be a plate-like structure, on which a plurality of holes are provided for installing various components. The elbow support 2 is fixed to the base 1, and one side of the elbow support 2 is provided with an upper arm support portion 21 for placing and supporting the upper arm 100. In this embodiment, the upper arm support portion 21 can be a first arc-shaped groove adapted to the outline size of the upper arm 100. Further, the rear side of the first arc-shaped groove is open, and its cross section can be C-shaped, so that it is more convenient for the patient to place the upper arm 100. A through hole 22 is also provided in the upper arm support portion 21 for the forearm 200 to pass through. Specifically, the axial direction of the through hole 22 can be perpendicular to the axial direction of the first arc-shaped groove, so that the forearm 200 and the upper arm 100 are in a vertical state. The reduction assembly 3 includes a mounting seat 31, a reducer body 32 and a forearm positioning member 33. The mounting seat 31 is fixed on the base 1. The reducer body 32 is adjustable in height on the mounting seat 31. The forearm positioning member 33 is arranged on the reducer body 32. After the forearm 200 extends from the through hole 22, it can be supported and positioned by the forearm positioning member 33. Since the reducer body 32 is adjustable in height, the height of the forearm positioning member 33 can be adjusted, so that the forearm 200 can be lifted conveniently to achieve wrist flexion operation on the wrist joint. Each group of finger sleeve traction assembly 4 includes a fixed pile 41, a traction rope 42 and a finger sleeve 43. The fixed pile 41 is arranged on the base 1. One end of the traction rope 42 is connected to the fixed pile 41, and the other end is connected to the finger sleeve 43. The finger sleeve 43 is used to be sleeved on the patient's finger and tightened, which can play the function of traction of the finger and wrist joint, so as to shorten and restore the fracture end. Preferably, the finger sleeve traction assembly 4 of this embodiment is provided with five groups, which are respectively provided on the five fingers of the patient in a one-to-one correspondence. The fixing assembly 5 is provided on one side of the base 1, and is used to fix the base 1 to the operating table, so as to facilitate the intraoperative reduction of the patient. The utility model realizes the reduction and holding functions of fractures in minimally invasive surgery of the forearm (including the hand), effectively ensures the reduction effect, improves the success rate of minimally invasive surgery of the forearm, and avoids radiation exposure damage to the patient caused by multiple X-ray fluoroscopy. It should be noted that the reduction and traction device can also be used for traction reduction and fixation of finger or palm surgery.
[0043] Optionally, the mounting seat 31 of the present embodiment is provided with a guide column 311 extending in the height direction, a guide hole 321 is provided in the resetter body 32, and the resetter body 32 is slidably connected to the guide column 311 through the guide hole 321; a padding block 34 is detachably mounted on the guide column 311, and the padding block 34 is located between the resetter body 32 and the mounting seat 31, and is used to adjust the height of the resetter body 32. The above-mentioned setting structure is simple and easy to operate. By changing the number or size of the padding blocks 34, the height of the resetter body 32 can be adjusted. Of course, in other embodiments, other height adjustment mechanisms, such as a cylinder, an electric cylinder, etc., can also be used, and are not limited to this embodiment.
[0044] Optionally, the reset assembly 3 also includes an adjustment handle 35 for adjusting the position of the forearm positioning member 33 in a direction perpendicular to the forearm 200, so as to squeeze the forearm 200 and give the wrist joint an ulnar deviation. The adjustment handle 35 specifically includes a screw 351 and a knob portion 352 disposed at the rear end of the screw 351. A threaded hole 322 is disposed in the resetter body 32. The front end of the screw 351 passes through the threaded hole 322 and is fixedly connected to the forearm positioning member 33. The screw 351 is threadedly matched with the threaded hole 322. By turning the knob portion 352, the forearm positioning member 33 can be driven to move in a direction perpendicular to the forearm 200. The adjustment handle 35 is simple in structure, easy to operate, and is conducive to reducing costs. Furthermore, the base 1 may be provided with a plurality of first adjustment holes 11 along the extension direction of the forearm 200, and the bottom of the mounting seat 31 is provided with a fixing column, which is selectively fixed in the first adjustment hole 11 at a suitable position, so as to adjust the installation position of the mounting seat 31 on the base 1, and further adjust the position of the forearm positioning member 33 relative to the forearm 200. Furthermore, the forearm positioning member 33 of this embodiment is provided with a second arc groove 331 for accommodating the forearm 200, and the second arc groove 331 is adapted to the contour size of the forearm 200, and can support and clamp the forearm 200; the second arc groove 331 is also openly provided, and can be set to be C-shaped, and the size of the lower end thereof is larger than the size of the upper end, so as to facilitate the insertion and support of the forearm 200.
[0045] In this embodiment, the base 1 is provided with a second adjustment hole 12, and the lower part of the fixed pile 41 is inserted and fixed in the second adjustment hole 12. Optionally, the number of the second adjustment holes 12 is multiple, and they are arranged in an array on the base 1 to adjust the installation position of each group of finger sleeve traction components 4, so as to adjust the traction direction and traction force of the fingers and wrist joints. Specifically, multiple rows of second adjustment holes 12 can be set along the extension direction of the fingers, and multiple columns of second adjustment holes 12 can be set along the lateral opening direction of the fingers. In this embodiment, the upper part of the fixed pile 41 is provided with a hanging groove 411, and one end of the traction rope 42 is provided with a connecting ring, and the connecting ring is hung in the hanging groove 411. It has a simple structure and is easy to assemble. When the installation position of the fixed pile 41 is changed, the traction rope 42 can be quickly installed in the hanging groove 411.
[0046] Optionally, the fixing assembly 5 of this embodiment includes a first fixing member 51 and a second fixing member 52, the first fixing member 51 is configured to be fixedly connected to the edge of the operating table, the second fixing member 52 is fixed to one side of the base 1, and the second fixing member 52 is locked and connected to the first fixing member 51 to fix the base 1 to the operating table. Optionally, the first fixing member 51 includes a clamping member 511, a connecting column 512 and a first locking wrench 513. The clamping member 511 is provided with a clamping groove, which can be C-shaped, and the clamping groove is used to clamp to the edge of the operating table. The connecting column 512 is fixed at the upper end of the clamping member 511 and is used to connect with the second fixing member 52. The first locking wrench 513 passes through the lower end of the clamping member 511 and enters the clamping groove, and is used to be tightly connected with the operating table to lock the clamping member 511 to the operating table. The above structure realizes a stable and reliable connection between the first fixing member 51 and the operating table, and is easy to install and disassemble, and is convenient for adjusting the installation position of the base 1 on the operating table. Exemplarily, the first locking wrench 513 includes a first operating rod and a first stud, the first operating rod is connected to one end of the first stud, the other end of the first stud passes through the lower end of the clamping piece 511 and extends into the clamping groove, and the first stud is threadedly engaged with the clamping piece 511 to make the first stud press against the operating table.
[0047] Optionally, the second fixing member 52 of this embodiment includes a first clamping portion 521, a second clamping portion 522 and a second locking wrench 523, the first clamping portion 521 is integrally arranged on one side of the base 1, the second clamping portion 522 is arranged opposite to the first clamping portion 521, and the second clamping portion 522 and the first clamping portion 521 are arranged on the opposite side thereof with a clamping groove for clamping the connecting column 512; the second locking wrench 523 passes through the second clamping portion 522 and is threadedly connected to the first clamping portion 521, and is used to lock the second clamping portion 522 and the first clamping portion 521 to the connecting column 512. When installing this embodiment, the first fixing member 51 is first fixed to the operating table, and then the base 1 is plugged into the connecting column 512, and the connecting column 512 is clamped by twisting the second locking wrench 523, so as to realize locking and fixing the base 1 to the operating table, and the structure is simple, the connection is reliable, and the operation is convenient. Exemplarily, the second locking wrench 523 includes a second operating rod and a second stud, the second operating rod is connected to one end of the second stud, and the other end of the second stud passes through the second clamping portion 522 and is threadedly connected to the first clamping portion 521 .
[0048] Furthermore, in this embodiment, a tracer and a plurality of steel balls arranged in a matrix can be installed on the base 1 to cooperate with the surgical robot to perform surgical operations, thereby improving surgical efficiency, reducing radiation dose, and facilitating early recovery of patients.
[0049] The method of using the utility model is as follows: after disinfection, first fix the first fixing piece 51 at a suitable position on the edge of the operating table, and then lock and fix the base 1 to the first fixing piece 51 through the second fixing piece 52; clamp the patient's upper arm 100 in the upper arm support part 21, and the forearm 200 extends out from the through hole 22, and the forearm 200 is clamped in the forearm positioning piece 33 of the reduction assembly 3; the finger sleeve 43 is sleeved and installed on the patient's finger, and the fixing pile 41 is installed at a suitable position of the base 1, and the patient's finger is pulled to shorten and restore the fracture end; at the same time, the position of the forearm positioning piece 33 can be adjusted by adjusting the handle 35 and the pad block 34 to realize the squeezing and lifting operation of the forearm 200, which respectively play the role of giving ulnar deviation and wrist flexion to the wrist joint.
[0050] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims
1. A forearm surgical reduction device, characterized in that: include: Base (1); An elbow support member (2) is fixed on the base (1), and an upper arm support portion (21) for supporting the upper arm (100) is provided on one side of the elbow support member (2), and a through hole (22) is provided in the upper arm support portion (21) for the forearm (200) to pass through; A reset assembly (3), comprising a mounting seat (31), a resetter body (32) and a forearm positioning member (33), wherein the mounting seat (31) is fixed on the base (1), the resetter body (32) is arranged on the mounting seat (31) in an adjustable manner in the height direction, the forearm positioning member (33) is arranged on the resetter body (32), and the forearm positioning member (33) is used to support and position the forearm (200); A finger sleeve traction assembly (4), comprising a fixing pile (41), a traction rope (42) and a finger sleeve (43), wherein the fixing pile (41) is arranged on the base (1), one end of the traction rope (42) is connected to the fixing pile (41), and the other end is connected to the finger sleeve (43), and the finger sleeve (43) is used to be sleeved on a finger; A fixing component (5) is arranged on one side of the base (1) and is used to fix the base (1) to the operating table.
2. The forearm surgical reduction device according to claim 1, characterized in that: The mounting seat (31) is provided with a guide column (311) extending in the height direction, and the resetter body (32) is provided with a guide hole (321), and the resetter body (32) is slidably connected to the guide column (311) through the guide hole (321); a padding block (34) is detachably mounted on the guide column (311), and the padding block (34) is located between the resetter body (32) and the mounting seat (31) and is used to adjust the height of the resetter body (32).
3. The forearm surgical reduction device according to claim 1, characterized in that: The reset assembly (3) further comprises an adjustment handle (35) for adjusting the position of the forearm positioning member (33) in a direction perpendicular to the forearm (200); the adjustment handle (35) comprises a screw rod (351) and a knob portion (352) arranged at the rear end of the screw rod (351); a threaded hole (322) is arranged in the resetter body (32); the front end of the screw rod (351) passes through the threaded hole (322) and is fixedly connected to the forearm positioning member (33); the screw rod (351) is threadedly matched with the threaded hole (322) to drive the forearm positioning member (33) to move.
4. The forearm surgical reduction device according to claim 1, characterized in that: A plurality of first adjustment holes (11) are arranged on the base (1) along the extension direction of the forearm (200), and the mounting seat (31) is adjustably fixed to the base (1) via the first adjustment holes (11).
5. The forearm surgical reduction device according to claim 1, characterized in that: The upper arm support portion (21) is a first arc-shaped groove capable of accommodating an upper arm (100); a second arc-shaped groove (331) capable of accommodating a forearm (200) is provided in the forearm positioning member (33); the first arc-shaped groove and the second arc-shaped groove (331) are both open.
6. The forearm surgical reduction device according to claim 1, characterized in that: A plurality of second adjustment holes (12) are arranged in an array on the base (1), and the fixing pile (41) is fixed to the base (1) in an adjustable manner through the second adjustment holes (12).
7. The forearm surgical reduction device according to claim 6, characterized in that: The upper part of the fixing pile (41) is provided with a hanging groove (411), and one end of the traction rope (42) is provided with a connecting ring, and the connecting ring is hung in the hanging groove (411).
8. The forearm surgical reduction device according to any one of claims 1 to 7, characterized in that: The fixing assembly (5) comprises a first fixing member (51) and a second fixing member (52), wherein the first fixing member (51) is configured to be fixedly connected to the edge of the operating table, and the second fixing member (52) is fixed to one side of the base (1), and the second fixing member (52) is lockedly connected to the first fixing member (51) to fix the base (1) to the operating table.
9. The forearm surgical reduction device according to claim 8, characterized in that: The first fixing member (51) comprises a clamping member (511), a connecting column (512) and a first locking wrench (513); the clamping member (511) is provided with a clamping groove, and the clamping groove is used to be clamped to the edge of the operating table; the connecting column (512) is provided at the upper end of the clamping member (511) and is used to be connected to the second fixing member (52); the first locking wrench (513) passes through the clamping member (511) and can be pressed against the operating table, and is used to lock the clamping member (511) to the operating table.
10. The forearm surgical reduction device according to claim 9, characterized in that: The second fixing member (52) comprises a first clamping portion (521), a second clamping portion (522) and a second locking wrench (523); the first clamping portion (521) is integrally arranged on one side of the base (1); the second clamping portion (522) is arranged opposite to the first clamping portion (521); and the second clamping portion (522) and the first clamping portion (521) are provided with clamping grooves on opposite sides thereof for clamping the connecting column (512); the second locking wrench (523) passes through the second clamping portion (522) and is threadedly connected to the first clamping portion (521) for enabling the second clamping portion (522) and the first clamping portion (521) to lock the connecting column (512).