Adjustable sliding locking system

Abstract

The utility model relates to the technical field of medical instruments, in particular to an adjustable sliding locking system which comprises a first fixing plate and a second fixing plate which are provided with a plurality of screw holes and are connected in a crossed mode through connecting screws, the second fixing plate is provided with a strip-shaped hole, and the side edge of the strip-shaped hole is provided with linear teeth. And the side surface of the crown part of the regulator is gear-shaped and is used for being matched with the linear teeth. According to the scheme, through cross connection of the two fixing plates, a stable fixing structure is provided; the relative movement of the fixing plate is precisely adjusted through the regulator which is rotationally matched with the linear teeth, so that the distance between the bone sheet and the fracture surface is precisely adjusted; the crown part of the regulator is supported and limited through the supporting piece, so that the regulation operation is stable and controllable. The scheme is simple in structure, easy to operate and suitable for clinical popularization.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and more specifically to an adjustable sliding locking system. Background Art

[0002] During fracture reduction surgery, it is often necessary to pull and fix the broken bone fragments in place on the fracture surface. However, the surgery often encounters the following problems. First, the bones or bone fragments on both sides of the fracture surface are often connected by soft tissue, which causes the bone fragments to be pulled away from the fracture surface by the soft tissue, making them difficult to align and fix. Second, the fracture surface is covered by a large area of ​​soft tissue on both sides, resulting in a small surgical operation area. The operation of pushing the bone fragments to be reduced through the soft tissue on both sides is not stable. Third, the adjustment of the distance between the two sides of the fracture surface is not precise enough. For those with normal bone quality, the bone fragments should be pressed tightly against the fracture surface to help the bones grow and repair faster; for patients with osteoporosis, the pressure between bones should not be too large. Too large pressure can easily lead to collapse or fracture, which is not conducive to bone repair. Therefore, a certain distance between the two sides of the fracture surface needs to be maintained.

[0003] In view of the above problems, existing fracture internal fixation devices are difficult to meet the requirements. The porous steel plates and screws commonly used in this field require manual position adjustment; the patent with application number 202122495650.6 provides an orthopedic connection screw plug, which realizes the splicing combination of multiple steel plates, but does not solve the technical problem of precise adjustment.

[0004] Therefore, there is an urgent need to provide a locking system that can accurately adjust the distance between the bone fragment and the fracture surface, thereby adjusting the pressure between the bone fragment and the fracture surface and improving the fracture recovery effect. Utility Model Content

[0005] The utility model aims to overcome at least one of the deficiencies of the above-mentioned prior art and provide an adjustable sliding locking system for accurately adjusting the distance between the bone fragment and the fracture surface, thereby adjusting the pressure between the bone fragment and the fracture surface and improving the fracture recovery effect.

[0006] The technical solution adopted by the utility model is to provide an adjustable sliding locking system, comprising:

[0007] A first fixing plate, provided with a plurality of screw holes;

[0008] A second fixing plate, used for being cross-arranged on the first fixing plate, provided with a strip hole and a plurality of screw holes, and the side of the strip hole is provided with straight teeth;

[0009] A connecting screw, used to penetrate the strip-shaped hole on the second fixing plate and the screw hole on the first fixing plate, and connect the first fixing plate and the second fixing plate; and

[0010] The regulator includes a crown and a handle. The side surface of the crown is gear-shaped and is used to cooperate with the straight teeth and fit against the other side of the strip-shaped hole. A positioning member is provided on the bottom surface of the crown, and the positioning member is a protrusion or a groove.

[0011] The scenario of the above technical solution is a mating surface. The first fixing plate is fixed to the surface of the base member on one side of the mating surface, and the second fixing plate is fixed to the surface of the separating member on the other side of the mating surface. In some embodiments, the mating surface is the fracture surface of a fracture, the base member is the bone in the normal position, and the separating member is the bone fragment.

[0012] The adjustable sliding locking system is provided with the first fixing plate and the second fixing plate cross-connected, providing a relatively stable fixing structure. By cooperating the regulator with the straight teeth and slowly rotating, the movement of the second fixing plate relative to the first fixing plate can be accurately adjusted, and then the distance between the base member and the separating member can be accurately adjusted. Limiting the height of the crown of the regulator and setting the positioning member are aimed at enabling the crown of the regulator to pass through the strip-shaped hole and press against the surface of the base member, preventing the regulator from idling in the strip-shaped hole during rotation and being unable to drive the second fixing plate to move.

[0013] Further, the adjustable sliding locking system further includes a support member. The support member includes a head and a rod portion. A protrusion or a groove is provided in the center of the top surface of the head of the support member for forming a cooperation with the positioning member on the bottom surface of the crown of the regulator and supporting the crown of the regulator. A groove is provided around the bottom surface of the head of the support member to facilitate tightening with a screwdriver. The rod portion of the support member is a threaded rod for embedding into the surface of the bone in the normal position. In some embodiments of the present invention, the support member is a screw or a bolt. When the surgical object is a patient with normal bone quality, its bone density is sufficient to support the crown of the regulator, and only a positioning pit needs to be chiseled below the strip-shaped hole, without the support member; while when the surgical object is a patient with osteoporosis, since the rotation of the regulator will also exert a certain pressure on the support member, the bone surface under the support member is prone to collapse when pressed. Therefore, setting the support member is beneficial to reducing the interference of bone surface collapse on the accurate adjustment operation. In addition, both the positioning pit or the groove on the head of the support member can limit the lateral displacement of the regulator, preventing the regulator from idling in the strip-shaped hole during rotation and being unable to drive the second fixing plate to move.

[0014] Further, a thread is provided on the side wall of the groove on the head of the support member. The adjustable sliding locking system further includes an additional bolt for forming a threaded connection with the groove on the head of the support member and further locking the second fixing plate. The additional bolt is used to pass through the screw hole on the second fixing plate and the strip-shaped hole on the first fixing plate after the accurate adjustment operation and screw into the groove of the support member to lock the second fixing plate, which is beneficial to further enhancing the fixing effect.

[0015] Further, the thickness of the first fixing plate is L1, the thickness of the second fixing plate is L2, the height of the head of the support member is w, and the range of the screw length L of the additional bolt is L1 + L2 - w < L ≤ 20 mm. Since the additional bolt passes through the screw hole on the second fixing plate and the elongated hole on the first fixing plate and is screwed into the groove of the support member, the screw length of the additional bolt needs to be long enough, L > L1 + L2 - w, but not exceed 20 mm. Let the length of the rod part of the support member be H. When the support member is a screw or a countersunk bolt, the end of the screw will not exceed the end of the rod part of the support member, L ≤ L1 + L2 + H - w; when the support member is a through-hole bolt, the end of the screw will penetrate the end of the rod part of the support member, L > L1 + L2 + H - w, and the locking effect is better at this time.

[0016] Further, to solve the problem of the loose connection between the connecting screw and the second fixing plate, the present utility model adopts two methods. In one embodiment of the present utility model, the lower bottom surface of the head of the connecting screw is the first friction surface, and the head diameter is greater than the width of the elongated hole, and the first friction surface covers the straight teeth. In another embodiment, a washer is provided between the head of the connecting screw and the second fixing plate, the lower bottom surface of the washer is the second friction surface, the diameter of the washer is greater than the width of the elongated hole, and the second friction surface covers the straight teeth.

[0017] Further, the straight teeth are one or more segments and are provided on any one side of the elongated hole; the tooth pitch of the straight teeth is 0.2 - 2 mm. The tooth pitch does not exceed 2 mm, making the adjustment of the distance between the bone piece and the fracture surface more precise.

[0018] Further, the crown diameter of the regulator is 3 - 8 mm, and the height of the positioning member of the regulator is 0.5 - 4 mm. The crown diameter of the regulator should be slightly smaller than the width of the elongated hole, but not too small, resulting in its inability to fit the other side of the elongated hole, further causing the regulator to slide in the direction perpendicular to the second fixing plate and interfering with the adjustment operation.

[0019] Further, the cross angle α between the first fixing plate and the second fixing plate at the connecting screw is in the range of 0° ≤ α ≤ 90°.

[0020] The above adjustable sliding locking system is used to precisely adjust the distance between the base member on one side of the mating surface and the separating member on the other side of the mating surface along a preset adjustment direction. The usage method is as follows:

[0021] S1. Take a screw hole on the first fixing plate as the intersection point of the first fixing plate and the second fixing plate, and fix the first fixing plate on the surface of the base member on one side of the mating surface through a screw, and stagger it with the preset adjustment direction;

[0022] S2. Take the straight line passing through the intersection point in the adjustment direction as the positioning straight line, and open positioning pits on the positioning straight line, on the side of the first fixing plate facing away from the separating part, and on the base part;

[0023] S3. Fix one end of the second fixing plate to the surface of the separating part on the other side of the mating surface by screws, embed the connecting screw into the surface of the base part to preliminarily fix the other end of the second fixing plate to the first fixing plate, so that the strip holes on the second fixing plate are distributed along the positioning straight line, the second fixing plate straddles the mating surface and forms an intersection with the first fixing plate, and the intersection point is below the strip holes on the second fixing plate; after preliminary fixing, the second fixing plate can slide relative to the first fixing plate along the adjustment direction;

[0024] S4. Insert the crown of the adjuster into the strip hole, make the crown of the adjuster cooperate with the straight tooth and fit with the side of the strip hole, the positioning part of the crown of the adjuster abuts against the positioning pit, and rotate the adjuster to accurately adjust the movement of the second fixing plate relative to the first fixing plate, and further accurately adjust the movement of the separating part relative to the base part;

[0025] S5. After the adjustment is completed, tighten the connecting screw to relatively fix the second fixing plate and the first fixing plate, and remove the adjuster.

[0026] When this method is used for osteoporosis patients, step S2 is replaced by taking the straight line passing through the intersection point in the adjustment direction as the positioning straight line, and screwing the support part into the base part on the side of the first fixing plate facing away from the separating part on the positioning straight line; the positioning pit in S4 is replaced by the support part.

[0027] To further enhance the locking effect, step S6 is added after step S5: Pass the additional bolt through the strip hole on the second fixing plate and screw it into the head groove of the support part to lock the second fixing plate.

[0028] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0029] The present utility model provides an adjustable sliding locking system. Through the cross-connection of two fixing plates, a relatively stable fixing structure is provided; by rotating the adjuster that cooperates with the straight tooth, the relative movement of the fixing plates is accurately adjusted, and further the distance between the bone piece and the fracture surface is accurately adjusted; the support part is used to support and limit the crown of the adjuster, making the adjustment operation stable and controllable. This solution has a simple structure and is easy to operate, can accurately adjust the distance between the bone piece and the fracture surface, thereby adjusting the pressure between the bone piece and the fracture surface, improving the fracture recovery effect, and is suitable for clinical promotion. Description of the Drawings

[0030] Figure 1 It is a schematic structural diagram of the adjustable sliding locking system provided for Embodiment 1.

[0031] Figure 2 Schematic structural diagram of the regulator provided in Embodiment 1.

[0032] Figure 3 Cross-sectional view of the adjustable sliding locking system provided in Embodiment 1 at the connecting screw.

[0033] Figure 4 Cross-sectional view of the adjustable sliding locking system provided in Embodiment 2 at the connecting screw.

[0034] Figure 5 Schematic structural diagram of the adjustable sliding locking system provided in Embodiment 3.

[0035] Figure 6 Cross-sectional view of the adjustable sliding locking system provided in Embodiment 3 at the connecting screw and the support member, where the support member is a bolt.

[0036] Figure 7 Schematic structural diagram of the adjustable sliding locking system provided in Embodiment 4.

[0037] Figure 8 Cross-sectional view of the adjustable sliding locking system provided in Embodiment 4 at the additional bolt, Figure 8 a the support member is a counterbore bolt, Figure 8 b the support member is a through-hole bolt.

[0038] Figure 9 The first fixing plate and the second fixing plate with different shapes and different crossing angles provided by the present invention.

[0039] Reference numeral description: normal-position bone 100, bone fragment 200, first fixing plate 300, second fixing plate 400, elongated hole 410, straight tooth 420, connecting screw 500, washer 510, first friction surface 520, second friction surface 530, regulator 600, positioning member 610, positioning pit 700, support member 800, additional bolt 900. Detailed implementation manners

[0040] The drawings of the present utility model are only for illustrative purposes and should not be construed as a limitation to the present utility model. For better illustrating the following embodiments, some components in the drawings may be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0041] The scenarios of the following embodiments are fracture reduction surgeries, the mating surface is the bone fracture surface, the base member is the normal-position bone 100, and the separating member is the bone fragment 200.

[0042] Embodiment 1

[0043] As Figures 1 to 3As shown, this embodiment provides an adjustable sliding locking system, including:

[0044] A first fixing plate 300, provided with a plurality of screw holes;

[0045] A second fixing plate 400, for being cross - arranged on the first fixing plate 300, provided with a strip - shaped hole 410 and a plurality of screw holes, and a straight tooth 420 is arranged on the side of the strip - shaped hole 410;

[0046] A connecting screw 500, for passing through the strip - shaped hole 410 on the second fixing plate 400 and the screw holes on the first fixing plate 300, and connecting the first fixing plate 300 and the second fixing plate 400; and

[0047] A regulator 600, including a crown and a handle, the side of the crown is gear - shaped, for cooperating with the straight tooth 420 and fitting against the other side of the strip - shaped hole 410, a positioning member 610 is arranged on the bottom surface of the crown, and the positioning member 610 is a protrusion.

[0048] The adjustable sliding locking system sets the first fixing plate 300 and the second fixing plate 400 to be cross - connected, providing a relatively stable fixing structure. By the regulator 600 cooperating with the straight tooth 420 and slowly rotating, the movement of the second fixing plate 400 relative to the first fixing plate 300 can be accurately adjusted, and then the distance between the normal - position bone 100 and the bone fragment 200 can be accurately adjusted. Limiting the height of the crown of the regulator 600 and arranging the positioning member 610 aims to make the crown of the regulator 600 pass through the strip - shaped hole 410 and press against the surface of the normal - position bone 100, avoiding the regulator 600 idling in the strip - shaped hole 410 during the rotation process and being unable to drive the second fixing plate 400 to move.

[0049] To solve the problem that the connection between the connecting screw 500 and the second fixing plate 400 becomes loose, as Figure 3 shown, the lower bottom surface of the head of the connecting screw 500 in this embodiment is a first friction surface, and the head diameter is larger than the width of the strip - shaped hole 410, and the first friction surface covers the straight tooth 420.

[0050] The tooth pitch of the straight tooth 420 is 1 mm. The tooth pitch does not exceed 2 mm, making the adjustment of the distance between the bone fragment 200 and the fracture surface more accurate.

[0051] The head diameter of the regulator 600 is 6.5 mm, and the height of the positioning member 610 of the regulator 600 is 2 mm. The head diameter of the regulator 600 should be slightly smaller than the width of the strip - shaped hole 410, but not too small, which may cause it not to fit against the other side of the strip - shaped hole 410, further causing the regulator 600 to slide in the direction perpendicular to the second fixing plate 400 and interfering with the adjustment operation.

[0052] The above adjustable sliding locking system is used to accurately adjust the distance between the base member on one side of the mating surface and the separating member on the other side of the mating surface along a preset adjustment direction. The usage method is as follows:

[0053] S1. Select a screw hole on the first fixing plate 300 as the intersection point of the first fixing plate 300 and the second fixing plate 400, and fix the first fixing plate 300 to the surface of the base member on one side of the mating surface through screws, and stagger it with the preset adjustment direction;

[0054] S2. Take the straight line passing through the intersection point in the adjustment direction as the positioning straight line, and open positioning pits 700 on the positioning straight line, on the side of the first fixing plate 300 facing away from the separating member, and on the base member;

[0055] S3. Fix one end of the second fixing plate 400 to the surface of the separating member on the other side of the mating surface through screws, embed the connecting screw 500 into the surface of the base member to preliminarily fix the other end of the second fixing plate 400 to the first fixing plate 300, so that the strip-shaped holes 410 on the second fixing plate 400 are distributed along the positioning straight line, the second fixing plate 400 straddles the mating surface and forms an intersection with the first fixing plate 300, and the intersection point is below the strip-shaped holes 410 on the second fixing plate 400; after preliminary fixing, the second fixing plate 400 can slide relative to the first fixing plate 300 along the adjustment direction;

[0056] S4. Insert the crown of the adjuster 600 into the strip-shaped hole 410, make the crown of the adjuster 600 cooperate with the straight teeth 420 and fit with the side of the strip-shaped hole 410, and the positioning member 610 of the crown of the adjuster 600 abuts against the positioning pit 700, and rotate the adjuster 600, so as to accurately adjust the movement of the second fixing plate 400 relative to the first fixing plate 300, and further accurately adjust the movement of the separating member relative to the base member;

[0057] S5. After the adjustment is completed, tighten the connecting screw 500 to relatively fix the second fixing plate 400 and the first fixing plate 300, and remove the adjuster 600.

[0058] The adjustable sliding locking system provided in this embodiment provides a relatively stable fixing structure through the cross connection of two fixing plates; by rotating the adjuster 600 that cooperates with the straight teeth 420, the relative movement of the fixing plates is accurately adjusted, and further the distance between the bone fragment 200 and the fracture surface is accurately adjusted; the head of the adjuster 600 is supported and limited by the support member 800, so that the adjustment operation is stable and controllable. The structure of this solution is simple, easy to operate, can accurately adjust the distance between the bone fragment 200 and the fracture surface, so as to adjust the pressure between the bone fragment 200 and the fracture surface, and improve the fracture recovery effect.

[0059] Embodiment 2

[0060] As Figure 4As shown, the difference between this embodiment and Embodiment 1 is only that a washer 510 is provided between the head of the connecting screw 500 and the second fixing plate 400. The lower bottom surface of the washer 510 is a second friction surface. The diameter of the washer 510 is greater than the width of the strip-shaped hole 410. The second friction surface covers the straight teeth 420 to ensure that the second friction surface presses against the second fixing plate 400.

[0061] Embodiment 3

[0062] As Figure 5 and Figure 6 As shown, the difference between this embodiment and Embodiment 1 is only that the adjustable sliding locking system further includes a support member 800. The support member 800 includes a head and a rod portion. A groove is provided in the center of the top surface of the head of the support member 800 for cooperating with the positioning member 610 on the bottom surface of the crown of the regulator 600 and supporting the crown of the regulator 600. Grooves are provided around the bottom surface of the head of the support member 800 to facilitate tightening with a screwdriver. The rod portion of the support member 800 is a threaded rod for embedding on the surface of the normal bone 100. In some embodiments of the present invention, the support member 800 is a screw or a bolt. When the surgical object is a patient with normal bone quality, the bone density is sufficient to support the crown of the regulator 600, and only a positioning pit 700 needs to be chiseled below the strip-shaped hole 410, and the support member 800 is not required; while when the surgical object is a patient with osteoporosis, since the rotation of the regulator 600 will also exert a certain pressure on the support member 800, the bone surface below the support member 800 is prone to collapse when pressed. Therefore, setting the support member 800 is beneficial to reducing the interference of bone surface collapse on the precise adjustment operation. In addition, both the positioning pit 700 or the groove on the head of the support member 800 can limit the lateral displacement of the regulator 600, preventing the regulator 600 from idling in the strip-shaped hole 410 during rotation and not being able to drive the second fixing plate 400 to move.

[0063] Correspondingly, the usage method needs to be modified as follows: Step S2 is replaced by taking the straight line passing through the intersection point as the positioning straight line, and screwing the support member 800 into the base member on the side of the first fixing plate 300 away from the separating member on the positioning straight line; the positioning pit 700 in S4 is replaced by the support member 800.

[0064] Embodiment 4

[0065] When a groove is provided in the center of the top surface of the head of the support member 800 provided in Embodiment 3, to further enhance the fixing effect, the adjustable sliding locking system further includes an additional bolt 900, as Figure 7 shown; the side wall of the groove on the head of the support member 800 provided in Embodiment 3 is provided with threads, and the additional bolt 900 is used to form a threaded connection with the groove on the head of the support member 800 and further lock the second fixing plate 400. The use of the additional bolt 900 is not limited to patients with osteoporosis.

[0066] Among them, the screw length of the additional bolt 900 needs to be restricted. As Figure 8 shown, let the thickness of the first fixing plate 300 be L1, the thickness of the second fixing plate 400 be L2, the head height of the support member 800 be w, and the rod length of the support member 800 be H. The range of the screw length L of the additional bolt 900 is L1 + L2 - w < L ≤ 20 mm. Since the additional bolt 900 passes through the screw hole on the second fixing plate 400 and the elongated hole 410 on the first fixing plate 300 and is screwed into the groove of the support member 800, the screw length of the additional bolt 900 needs to be long enough, L > L1 + L2 - w, but not exceed 20 mm. When the support member 800 is a screw (not shown in the figure) or a counterbore bolt, as Figure 8 shown in a, the end of the screw will not extend beyond the end of the rod of the support member 800, L < L1 + L2 + H - w; when the support member 800 is a through-hole bolt, as Figure 8 shown in b, the end of the screw will penetrate through the end of the rod of the support member 800, L ≥ L1 + L2 + H - w, and the locking effect is better at this time.

[0067] The method for precisely adjusting the bone fracture surface spacing provided in this embodiment further needs to add the following steps:

[0068] S6. Pass the additional bolt 900 through the elongated hole 410 on the second fixing plate 400 and screw it into the groove of the support member 800 to lock the second fixing plate 400.

[0069] Obviously, the above embodiments of the present invention are only examples for clearly explaining the technical solutions of the present invention, rather than limiting the specific implementation manners of the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the claims of the present invention shall be included within the protection scope of the claims of the present invention. For example, those skilled in the art can select the shapes and intersection angles of the first fixing plate 300 and the second fixing plate 400 as needed: as Figure 1 and Figure 9 shown, the shapes include but are not limited to linear, arc-shaped, Y-shaped, dendritic, palm-shaped, and array-shaped; the range of the included angle α between the first fixing plate 300 and the second fixing plate 400 is 0° ≤ α ≤ 90°, where α = 90° as Figure 9 shown in a, α is an acute angle as Figure 9 shown in b, and α = 0° as Figure 9 shown in c.

Claims

1. An adjustable sliding locking system, characterized in that: include: A first fixing plate, provided with a plurality of screw holes; A second fixing plate, used for being cross-arranged on the first fixing plate, provided with a strip hole and a plurality of screw holes, and the side of the strip hole is provided with straight teeth; A connecting screw, used to penetrate the strip-shaped hole on the second fixing plate and the screw hole on the first fixing plate, and connect the first fixing plate and the second fixing plate; and The regulator comprises a crown and a handle. The side surface of the crown is gear-shaped for cooperating with the linear teeth and fitting with the other side of the strip hole. The bottom surface of the crown is provided with a positioning piece, which is a protrusion or a groove.

2. An adjustable sliding locking system according to claim 1, characterized in that: It also includes a support member, which includes a head and a rod; a protrusion or a groove is provided in the center of the top surface of the support member head, which is used to cooperate with the positioning member on the bottom surface of the regulator crown and support the regulator crown; the support member rod is a threaded rod.

3. An adjustable sliding locking system according to claim 2, characterized in that: The side wall of the support member head groove is provided with threads, and the adjustable sliding locking system further includes an additional bolt for forming a threaded connection with the support member head groove and further locking the second fixing plate.

4. An adjustable sliding locking system according to claim 3, characterized in that: The thickness of the first fixing plate is L1, the thickness of the second fixing plate is L2, the height of the support head is w, and the range of the screw length L of the additional bolt is L1+L2-w<L≤20mm.

5. An adjustable sliding locking system according to any one of claims 1 to 4, characterized in that: The lower bottom surface of the head of the connecting screw is a first friction surface, and the diameter of the head is greater than the width of the strip-shaped hole, and the first friction surface covers the linear teeth.

6. An adjustable sliding locking system according to any one of claims 1 to 4, characterized in that: A washer is provided between the head of the connecting screw and the second fixing plate, the lower bottom surface of the washer is a second friction surface, the diameter of the washer is greater than the width of the strip hole, and the second friction surface covers the linear teeth.

7. An adjustable sliding locking system according to any one of claims 1 to 4, characterized in that: The straight line teeth are one or more segments and are arranged on any side of the strip hole.

8. An adjustable sliding locking system according to any one of claims 1 to 4, characterized in that: The tooth spacing of the linear teeth is 0.2-2 mm.

9. An adjustable sliding locking system according to any one of claims 1 to 4, characterized in that: The diameter of the crown of the regulator is 3-8 mm, and the height of the positioning piece of the regulator is 0.5-4 mm.

10. An adjustable sliding locking system according to any one of claims 1 to 4, characterized in that: The range of the intersection angle α of the first fixing plate and the second fixing plate at the connecting screw is 0°≤α≤90°.

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