Osteotomy guide plate

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to an osteotomy guide plate which comprises a guide plate body and further comprises a lifting assembly arranged on the surface of the guide plate body, and the lifting assembly comprises an upper supporting plate arranged below the guide plate body and a lower supporting plate arranged below the upper supporting plate. The upper surface of the lower supporting plate is fixedly connected with a second connecting block, the second connecting block is inserted into a first through groove formed in the surface of the upper supporting plate, and the upper surface of the upper supporting plate is fixedly connected with a first connecting block. The heights of the two sides of the osteotomy guide plate can be adjusted by rotating the first threaded knob and the second threaded knob respectively, meanwhile, the left-right inclination angle can be adjusted, and the problem that the risk of orthopedic surgery is increased due to the fact that the osteotomy position deviates and is inconvenient to operate is solved; and the guide plate body can incline forwards and backwards by rotating two third threaded knobs respectively, so that the application range of the osteotomy guide plate is widened.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical instruments, and in particular relates to an osteotomy guide plate. Background Art

[0002] Osteoarthritis has become one of the most common bone and joint diseases in humans. Currently, doctors generally use osteotomy to treat osteoarthritis caused by bone deformities, bone tumors, severe bone trauma, etc. However, in traditional orthopedic surgery, doctors determine the surgical plan for the patient by checking the patient's preoperative X-ray film. During the operation, the traditional osteotomy plate and Kirschner wire are used to pass the osteotomy plate through the Kirschner wire to the position where surgery is required, and finally the osteotomy tool is passed through the osteotomy plate to complete the operation.

[0003] The osteotomy plate and the Kirschner wire are used together. After the osteotomy plate and the Kirschner wire are placed to the position where surgery is required, the position of the osteotomy plate is fixed, thereby fixing the position of the osteotomy. If the position of the osteotomy deviates, the osteotomy plate needs to be fixed again with the Kirschner wire, which increases the risk of orthopedic surgery.

[0004] Therefore, an osteotomy guide is designed to solve the above problems. Utility Model Content

[0005] To solve the problems raised in the above background technology, the utility model provides an osteotomy guide plate, which is conducive to adjusting the height of both sides of the osteotomy guide plate, and can also adjust the left and right inclination angles. By rotating two third threaded knobs respectively, the guide plate body can be tilted forward and backward, thereby improving the application range of the osteotomy guide plate.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an osteotomy guide plate, comprising a guide plate body, and also comprising a lifting assembly arranged on the surface of the guide plate body;

[0007] The lifting assembly includes an upper support plate arranged below the guide plate body and a lower support plate arranged below the upper support plate, the upper surface of the lower support plate is fixedly connected to a second connecting block, the second connecting block is inserted in a through groove one opened in the surface of the upper support plate, the upper surface of the upper support plate is fixedly connected to a first connecting block, the first connecting block is inserted in a first mounting groove opened in the bottom surface of the guide plate body, and a first threaded knob and a second threaded knob are respectively inserted in two groups of through holes three symmetrically opened on the upper surface of the guide plate body, the surfaces of the first threaded knob and the second threaded knob are respectively sleeved with a first nut, and the second threaded knob passes through the through groove three opened on the surface of the upper support plate.

[0008] As a preferred osteotomy guide plate of the utility model, four wire plates are fixedly connected to the bottom surface of the guide plate body, each of the wire plates is fitted with the surface of the upper support plate and the lower support plate, and the surface of the wire plates is inlaid with scale lines.

[0009] As a preferred osteotomy guide plate of the utility model, a first rotating shaft is inserted into a through hole 1 opened in the front surface of the upper support plate, the first rotating shaft passes through the second connecting block, the second connecting block is rotatably connected to the upper support plate through the first rotating shaft, and a second rotating shaft is inserted into a through hole 2 opened in the front surface of the guide plate body, the second rotating shaft passes through the first connecting block, and the first connecting block is rotatably connected to the guide plate body through the second rotating shaft.

[0010] As a preferred osteotomy guide plate of the utility model, the two first nuts are respectively arranged in two first rectangular grooves symmetrically opened on the surface of the guide plate body, and the first nuts are slidably connected to the guide plate body.

[0011] As a preferred osteotomy guide plate of the utility model, an inclined section is provided on the bottom surface of the upper support plate near the second connecting block.

[0012] As a preferred osteotomy guide plate of the utility model, it also includes a tilting component arranged on the surface of the guide plate body;

[0013] The tilting assembly includes two limiting protrusions symmetrically fixedly connected to the surface of the guide plate body, a second mounting groove opened on the surface of the guide plate body, and an embedded block arranged inside the second mounting groove. Two third rotating shafts are symmetrically fixedly connected to the surface of the embedded block. The two third rotating shafts are respectively inserted into the rotating holes opened inside the guide plate body. The embedded block is rotatably connected to the guide plate body through the third rotating shaft. A second rectangular groove is opened on the adjacent sides of the two limiting protrusions. A second nut is inserted inside each of the second rectangular grooves. A third threaded knob is inserted into each through hole four opened on the surface of each limiting protrusion. The third threaded knob passes through the second nut and abuts against the surface of the embedded block.

[0014] Compared with the prior art, the beneficial effects of the utility model are: a lifting component is added to the present application, and the height of both sides of the osteotomy guide can be adjusted by rotating the first threaded knob and the second threaded knob respectively, and the left and right inclination angles can be adjusted at the same time, thereby alleviating the problem of inconvenience in operation caused by deviation in the osteotomy position, thereby increasing the risk of orthopedic surgery. At the same time, a tilting component is added, and the guide body can be tilted forward and backward by rotating the two third threaded knobs respectively, thereby improving the application range of the osteotomy guide. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the structure of the limiting protrusion and the guide plate body in the utility model;

[0018] Figure 3 It is a structural schematic diagram of the embedded block and the third rotating shaft in the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the first connecting block and the upper supporting plate in the utility model;

[0020] Figure 5 This is a structural schematic diagram of the guide plate body of the utility model;

[0021] In the figure:

[0022] 1. Guide plate body;

[0023] 2. Lifting assembly; 21. First threaded knob; 22. Second threaded knob; 23. Upper support plate; 24. Lower support plate; 25. Wire guide plate; 26. First rectangular groove; 27. First nut; 28. Inclined section; 29. ​​First connecting block; 210. Second connecting block; 211. First mounting groove; 212. First rotating shaft; 213. Second rotating shaft;

[0024] 3. Tilt assembly; 31. Limiting protrusion; 32. Third threaded knob; 33. Second rectangular groove; 34. Second nut; 35. Second mounting groove; 36. Embedded block; 37. Third rotating shaft. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] like Figure 1 As shown;

[0027] A bone cutting guide plate comprises a guide plate body 1.

[0028] In this embodiment: the osteotomy plate and the Kirschner wire cooperate to fix the osteotomy plate to the position where surgery is required, thereby fixing the position of the osteotomy. If the position of the osteotomy deviates, the osteotomy plate needs to be fixed again with the Kirschner wire, which increases the risk of orthopedic surgery. In order to solve this technical problem, a lifting component 2 and a tilting component 3 are added on this basis.

[0029] More specifically:

[0030] Example 1

[0031] like Figures 1 to 4 As shown:

[0032] In combination with the above content: the lifting assembly 2 includes an upper support plate 23 arranged below the guide plate body 1 and a lower support plate 24 arranged below the upper support plate 23, the upper surface of the lower support plate 24 is fixedly connected with a second connection block 210, the second connection block 210 is inserted into a through groove 1 opened on the surface of the upper support plate 23, the upper surface of the upper support plate 23 is fixedly connected with a first connection block 29, the first connection block 29 is inserted into a first installation groove 211 opened on the bottom surface of the guide plate body 1, and the first threaded knob 21 and the second threaded knob 22 are respectively inserted into two groups of through holes 3 symmetrically opened on the upper surface of the guide plate body 1, and the surfaces of the first threaded knob 21 and the second threaded knob 22 are respectively sleeved with first threaded knobs The mother 27, the second threaded knob 22 passes through the through slot three opened on the surface of the upper support plate 23, the through hole one opened on the front surface of the upper support plate 23 is inserted with the first rotating shaft 212, the first rotating shaft 212 passes through the second connecting block 210, the second connecting block 210 is rotatably connected to the upper support plate 23 through the first rotating shaft 212, the through hole two opened on the front surface of the guide plate body 1 is inserted with the second rotating shaft 213, the second rotating shaft 213 passes through the first connecting block 29, the first connecting block 29 is rotatably connected to the guide plate body 1 through the second rotating shaft 213, the two first nuts 27 are respectively arranged in the two first rectangular grooves 26 symmetrically opened on the surface of the guide plate body 1, and the first nut 27 is slidably connected to the guide plate body 1.

[0033] In this embodiment, the guide plate body 1, the upper support plate 23 and the lower support plate 24 are all in a square shape. Figure 1As shown, the shapes of the guide plate body 1, the upper support plate 23 and the lower support plate 24 match the femur, so they are suitable for femoral osteotomy surgery. When in use, the rotation of the first threaded knob 21 can push the inclined section 28 to move under the action of one of the first nuts 27. During the movement, the inclined section 28 drives the first connecting block 29 to rotate with the second rotating shaft 213 as the axis, thereby realizing the distance adjustment of one side of the osteotomy guide plate. The second threaded knob 22 is rotated, and the rotation of the second threaded knob 22 can push the lower support plate 24 to rotate under the action of another first nut 27. The rotation of the lower support plate 24 drives the second connecting block 210 to rotate with the first rotating shaft 212 as the axis, thereby realizing the distance adjustment of the other side of the osteotomy guide plate. By rotating the first threaded knob 21 and the second threaded knob 22 respectively, the height of both sides of the osteotomy guide plate can be adjusted, and the left and right inclination angles can be adjusted at the same time, which alleviates the problem of inconvenience in operation caused by deviation of the osteotomy position, thereby increasing the risk of orthopedic surgery.

[0034] Going further:

[0035] In an optional embodiment, four wire guides 25 are fixedly connected to the bottom surface of the guide plate body 1, each wire guide 25 is in contact with the surface of the upper support plate 23 and the lower support plate 24, and the surface of the wire guide 25 is inlaid with scale lines.

[0036] In this embodiment: during the process of adjusting the osteotomy position, the four guide wire plates 25 fit the upper support plate 23 and the lower support plate 24 to avoid shaking of the upper support plate 23 and the lower support plate 24, thereby ensuring the use effect of the osteotomy guide plate and improving the safety during the osteotomy process.

[0037] It should be noted that: square grooves are provided on the surfaces of the upper support plate 23 and the lower support plate 24, and the wire guide 25 is located inside the square grooves. The upper support plate 23 and the lower support plate 24 will not be hindered by the setting of the wire guide 25 during the rotation process.

[0038] Going further:

[0039] In an optional embodiment, an inclined cut surface 28 is formed on the bottom surface of the upper support plate 23 near the second connection block 210 .

[0040] In this embodiment, the inclined cut surface 28 is provided to facilitate the relative rotation of the upper support plate 23 and the lower support plate 24, thereby avoiding the problem of the upper support plate 23 and the lower support plate 24 being stuck during the relative rotation.

[0041] Going further:

[0042] In an optional embodiment, it further includes a tilting component 3 disposed on the surface of the guide plate body 1;

[0043] The tilting assembly 3 includes two limiting protrusions 31 symmetrically fixedly connected to the surface of the guide plate body 1, a second mounting groove 35 opened on the surface of the guide plate body 1, and an embedded block 36 arranged inside the second mounting groove 35. Two third rotating shafts 37 are symmetrically fixedly connected to the surface of the embedded block 36. The two third rotating shafts 37 are respectively inserted into the rotating holes opened inside the guide plate body 1. The embedded block 36 is rotatably connected to the guide plate body 1 through the third rotating shaft 37. A second rectangular groove 33 is opened on the adjacent side of the two limiting protrusions 31. A second nut 34 is inserted inside each second rectangular groove 33. A third threaded knob 32 is inserted in the through hole four opened on the surface of each limiting protrusion 31. The third threaded knob 32 passes through the second nut 34 and abuts against the surface of the embedded block 36.

[0044] In this embodiment: since two limiting protrusions 31 are provided on the surface of the guide plate body 1, and a third threaded knob 32 is inserted on each limiting protrusion 31, when it is necessary to tilt the guide plate body 1 forward or backward, one of the third threaded knobs 32 is rotated, and the rotation of the third threaded knob 32 is acted upon by the second nut 34 connected thereto, so that the embedded block 36 rotates around the third rotating shaft 37 as the axis. By rotating the two third threaded knobs 32 respectively, the guide plate body 1 can be tilted forward or backward, thereby improving the application range of the osteotomy guide.

[0045] It should be noted that the K-wire passes through the positioning hole provided on the surface of the embedding block 36 , and the embedding block 36 and the guide plate body 1 rotate relative to each other, so that the guide plate body 1 can be tilted forward and backward.

[0046] Example 2

[0047] like Figures 2 to 5 As shown:

[0048] In combination with the above content: the lifting assembly 2 includes an upper support plate 23 arranged below the guide plate body 1 and a lower support plate 24 arranged below the upper support plate 23, the upper surface of the lower support plate 24 is fixedly connected with a second connection block 210, the second connection block 210 is inserted into a through groove 1 opened on the surface of the upper support plate 23, the upper surface of the upper support plate 23 is fixedly connected with a first connection block 29, the first connection block 29 is inserted into a first installation groove 211 opened on the bottom surface of the guide plate body 1, and the first threaded knob 21 and the second threaded knob 22 are respectively inserted into two groups of through holes 3 symmetrically opened on the upper surface of the guide plate body 1, and the surfaces of the first threaded knob 21 and the second threaded knob 22 are respectively sleeved with first threaded knobs The mother 27, the second threaded knob 22 passes through the through slot three opened on the surface of the upper support plate 23, the through hole one opened on the front surface of the upper support plate 23 is inserted with the first rotating shaft 212, the first rotating shaft 212 passes through the second connecting block 210, the second connecting block 210 is rotatably connected to the upper support plate 23 through the first rotating shaft 212, the through hole two opened on the front surface of the guide plate body 1 is inserted with the second rotating shaft 213, the second rotating shaft 213 passes through the first connecting block 29, the first connecting block 29 is rotatably connected to the guide plate body 1 through the second rotating shaft 213, the two first nuts 27 are respectively arranged in the two first rectangular grooves 26 symmetrically opened on the surface of the guide plate body 1, and the first nut 27 is slidably connected to the guide plate body 1.

[0049] In this embodiment, the guide plate body 1, the upper support plate 23 and the lower support plate 24 are all in an arc-shaped structure. Figure 5 As shown, the shapes of the guide plate body 1, the upper support plate 23 and the lower support plate 24 match the tibia, so they are suitable for tibial osteotomy surgery. When in use, the rotation of the first threaded knob 21 can push the inclined section 28 to move under the action of one of the first nuts 27. During the movement, the inclined section 28 drives the first connecting block 29 to rotate with the second rotating shaft 213 as the axis, thereby realizing the distance adjustment of one side of the osteotomy guide plate. The second threaded knob 22 is rotated, and the rotation of the second threaded knob 22 can push the lower support plate 24 to rotate under the action of another first nut 27. The rotation of the lower support plate 24 drives the second connecting block 210 to rotate with the first rotating shaft 212 as the axis, thereby realizing the distance adjustment of the other side of the osteotomy guide plate. By rotating the first threaded knob 21 and the second threaded knob 22 respectively, the height of both sides of the osteotomy guide plate can be adjusted, and the left and right inclination angles can be adjusted at the same time, which alleviates the problem of inconvenience in operation caused by deviation of the osteotomy position, thereby increasing the risk of orthopedic surgery.

[0050] Going further:

[0051] In an optional embodiment, four wire plates 25 are fixedly connected to the bottom surface of the guide plate body 1, each wire plate 25 is in contact with the surface of the upper support plate 23 and the lower support plate 24, and the surface of the wire plate 25 is inlaid with scale lines.

[0052] In this embodiment: during the process of adjusting the osteotomy position, the four guide wire plates 25 fit the upper support plate 23 and the lower support plate 24 to avoid shaking of the upper support plate 23 and the lower support plate 24, thereby ensuring the use effect of the osteotomy guide plate and improving the safety during the osteotomy process.

[0053] It should be noted that: square grooves are provided on the surfaces of the upper support plate 23 and the lower support plate 24, and the wire guide 25 is located inside the square grooves. The upper support plate 23 and the lower support plate 24 will not be hindered by the setting of the wire guide 25 during the rotation process.

[0054] Going further:

[0055] In an optional embodiment, an inclined cut surface 28 is formed on the bottom surface of the upper support plate 23 near the second connection block 210 .

[0056] In this embodiment, the inclined cut surface 28 is provided to facilitate the relative rotation of the upper support plate 23 and the lower support plate 24, thereby avoiding the problem of the upper support plate 23 and the lower support plate 24 being stuck during the relative rotation.

[0057] Going further:

[0058] In an optional embodiment, it further includes a tilting component 3 disposed on the surface of the guide plate body 1;

[0059] The tilting assembly 3 includes two limiting protrusions 31 symmetrically fixedly connected to the surface of the guide plate body 1, a second mounting groove 35 opened on the surface of the guide plate body 1, and an embedded block 36 arranged inside the second mounting groove 35. Two third rotating shafts 37 are symmetrically fixedly connected to the surface of the embedded block 36. The two third rotating shafts 37 are respectively inserted into the rotating holes opened inside the guide plate body 1. The embedded block 36 is rotatably connected to the guide plate body 1 through the third rotating shaft 37. A second rectangular groove 33 is opened on the adjacent side of the two limiting protrusions 31. A second nut 34 is inserted inside each second rectangular groove 33. A third threaded knob 32 is inserted in the through hole four opened on the surface of each limiting protrusion 31. The third threaded knob 32 passes through the second nut 34 and abuts against the surface of the embedded block 36.

[0060] In this embodiment: since two limiting protrusions 31 are provided on the surface of the guide plate body 1, and a third threaded knob 32 is inserted on each limiting protrusion 31, when it is necessary to tilt the guide plate body 1 forward or backward, one of the third threaded knobs 32 is rotated, and the rotation of the third threaded knob 32 is acted upon by the second nut 34 connected thereto, so that the embedded block 36 rotates around the third rotating shaft 37 as the axis. By rotating the two third threaded knobs 32 respectively, the guide plate body 1 can be tilted forward or backward, thereby improving the application range of the osteotomy guide.

[0061] It should be noted that the K-wire passes through the positioning hole provided on the surface of the embedding block 36 , and the embedding block 36 and the guide plate body 1 rotate relative to each other, so that the guide plate body 1 can be tilted forward and backward.

[0062] Working principle: the Kirschner wire passes through the embedding block 36 and hits the inside of the bone. After the guide body 1 cooperates with the Kirschner wire to fix the guide body 1 to the position where surgery is required, if the guide body 1 deviates from the osteotomy position, the first threaded knob 21 is rotated. The rotation of the first threaded knob 21 can push the inclined section 28 to move under the action of one of the first nuts 27. During the movement, the inclined section 28 drives the first connecting block 29 to rotate around the second rotating shaft 213 as the axis, thereby achieving distance adjustment on one side of the osteotomy guide. The second threaded knob 22 is rotated. The rotation of the second threaded knob 22 can push the lower support plate 24 to rotate under the action of another first nut 27. The rotation of the lower support plate 24 drives the second connecting block 210 to rotate around the first rotating shaft 212 as the axis, thereby achieving distance adjustment on the other side of the osteotomy guide. The osteotomy guide can be adjusted by rotating the first threaded knob 21 and the second threaded knob 22 respectively. The height of both sides can be adjusted, and the left and right inclination angles can be adjusted at the same time, which alleviates the problem of inconvenient operation caused by deviation in the osteotomy position, thereby increasing the risk of orthopedic surgery. In the process of adjusting the osteotomy position, the four wire plates 25 are fitted with the upper support plate 23 and the lower support plate 24 to avoid the shaking of the upper support plate 23 and the lower support plate 24, thereby ensuring the use effect of the osteotomy guide and improving the safety during the osteotomy process. Since two limiting protrusions 31 are provided on the surface of the guide plate body 1, and each limiting protrusion 31 is inserted with a third threaded knob 32, when it is necessary to tilt the guide plate body 1 forward and backward, one of the third threaded knobs 32 is rotated. The rotation of the third threaded knob 32 is under the action of the second nut 34 connected thereto, so that the embedded block 36 rotates with the third rotating shaft 37 as the axis. By rotating the two third threaded knobs 32 respectively, the guide plate body 1 can be tilted forward and backward, thereby improving the application range of the osteotomy guide.

[0063] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An osteotomy guide plate, comprising a guide plate body (1), characterized in that: It also includes a lifting assembly (2) arranged on the surface of the guide plate body (1); The lifting assembly (2) comprises an upper support plate (23) arranged below the guide plate body (1) and a lower support plate (24) arranged below the upper support plate (23); a second connection block (210) is fixedly connected to the upper surface of the lower support plate (24); the second connection block (210) is inserted into a through slot 1 provided on the surface of the upper support plate (23); a first connection block (29) is fixedly connected to the upper surface of the upper support plate (23); the first connection block (29) is inserted into a first mounting slot (211) provided on the bottom surface of the guide plate body (1); a first threaded knob (21) and a second threaded knob (22) are respectively inserted into two groups of through holes symmetrically provided on the upper surface of the guide plate body (1); first nuts (27) are respectively sleeved on the surfaces of the first threaded knob (21) and the second threaded knob (22); and the second threaded knob (22) passes through the through slot 3 provided on the surface of the upper support plate (23).

2. The osteotomy guide plate according to claim 1, characterized in that: Four wire plates (25) are fixedly connected to the bottom surface of the guide plate body (1), each of the wire plates (25) is in contact with the surface of the upper support plate (23) and the lower support plate (24), and the surface of the wire plates (25) is inlaid with scale lines.

3. The osteotomy guide plate according to claim 1, characterized in that: A first rotating shaft (212) is inserted into a through hole 1 formed on the front surface of the upper support plate (23), the first rotating shaft (212) passes through the second connecting block (210), and the second connecting block (210) is rotatably connected to the upper support plate (23) via the first rotating shaft (212); a second rotating shaft (213) is inserted into a through hole 2 formed on the front surface of the guide plate body (1), the second rotating shaft (213) passes through the first connecting block (29), and the first connecting block (29) is rotatably connected to the guide plate body (1) via the second rotating shaft (213).

4. The osteotomy guide plate according to claim 1, characterized in that: The two first nuts (27) are respectively arranged in two first rectangular grooves (26) symmetrically opened on the surface of the guide plate body (1), and the first nuts (27) and the guide plate body (1) are slidably connected.

5. The osteotomy guide plate according to claim 1, characterized in that: An inclined cut surface (28) is provided on the bottom surface of the upper support plate (23) at a position close to the second connection block (210).

6. The osteotomy guide plate according to claim 1, characterized in that: It also includes a tilting component (3) arranged on the surface of the guide plate body (1); The tilting assembly (3) comprises two limiting protrusions (31) symmetrically fixedly connected to the surface of the guide plate body (1), a second mounting groove (35) provided on the surface of the guide plate body (1), and an embedded block (36) arranged inside the second mounting groove (35); two third rotating shafts (37) are symmetrically fixedly connected to the surface of the embedded block (36); the two third rotating shafts (37) are respectively inserted into the rotating holes provided inside the guide plate body (1); the embedded block (36) is rotatably connected to the guide plate body (1) through the third rotating shafts (37); a second rectangular groove (33) is provided on adjacent sides of the two limiting protrusions (31); a second nut (34) is inserted into the interior of each of the second rectangular grooves (33); a third threaded knob (32) is inserted into the through hole (34) provided on the surface of each limiting protrusion (31); the third threaded knob (32) passes through the second nut (34) and contacts the surface of the embedded block (36).

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