Distraction screw with adjustable centrum reduction angle
By designing a vertebral repositioning angle adjustable distraction screw with rotating and limiting components, the problem of non-adjustable angle of existing pedicle screws is solved, enabling flexible adaptation and stable fixation of the screw in different vertebral segments, and improving the accuracy and stability of vertebral repositioning.
Patent Information
- Application Number
- CN202511882576.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-15
- Publication Date
- 2026-01-13
AI Technical Summary
Existing pedicle screws cannot be adjusted in angle during use, which makes them unable to adapt to the differences in physiological curvature of different vertebral segments, resulting in insufficient reduction or excessive stretching, thus affecting the vertebral reduction effect.
An adjustable vertebral repositioning angle expansion screw was designed. By setting a rotation component, a limiting component, and an expansion component, the screw angle can be flexibly adjusted and stably fixed. The screw includes the rotational support of ball one and ball two, the friction enhancement between the limiting groove and the limiting block, and the expansion and engagement of the screw body.
It improves the fixation and repositioning accuracy and stability of the screw at different angles, reduces the probability of loosening and displacement of the screw during use, and enhances the effect of vertebral repositioning.
Smart Images
Figure CN121313286A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of medical devices, and more specifically, to a vertebral body repositioning angle adjustable expansion screw. Background Technology
[0002] Pedicle screw fixation systems are implantable devices used in spinal surgery for vertebral fixation and repositioning. They are usually part of the spinal internal fixation system. Their core function is to correct vertebral displacement through the leverage or lifting effect of pedicle screws, and, in conjunction with the rod-and-screw system, stabilize the spinal structure, relieve spinal cord or nerve compression, restore vertebral height and physiological curvature, and promote bone healing.
[0003] The existing pedicle screw consists of a screw, a cap, and threads, and the structure of the three is relatively fixed. The angle between the screw and the cap cannot be adjusted during use. However, in actual application, due to the differences in the physiological curvature of different vertebral segments, the existing screw cannot adapt to different physiological curvatures, which leads to problems such as over-spreading or insufficient reduction during use. This is not conducive to improving the recovery rate of the anterior and posterior edge height of the vertebral body and the inner diameter of the spinal canal, and thus affects the reduction of the vertebral body. Summary of the Invention
[0004] To address the problem that the angle of the vertebral repositioning screw in the prior art is not easy to adjust, this invention provides a vertebral repositioning angle adjustable opening screw by setting up a rotating component. A part of the ball covers the outside of the second ball, which can support the rotation of the second ball and allows for flexible adjustment of the screw angle.
[0005] To solve the above problems, the present invention adopts the following technical solution:
[0006] An adjustable vertebral repositioning angle expansion screw includes a screw body, a second ball fixedly connected to the outer surface of the front end of the screw body, a rotating assembly provided on the outer side of the second ball, the rotating assembly including a first ball rotatably connected to the outer surface of the second ball, a screw tail fixedly connected to the front side of the outer surface of the first ball, a push rod threadedly connected to the inner side of the screw tail, a contact plate fixedly attached to the outer surface of the push rod near the second ball, and the outer surface of the contact plate having anti-slip texture.
[0007] Optionally, the contact plate has a fan-shaped structure and is made of an elastic wear-resistant material. The number of contact plates is several groups and they are arranged in a ring array. The outer surface of the contact plate is in close contact with the sphere. The outer surface of the screw is conical and has threads and is hollow inside.
[0008] Optionally, an anti-loosening component is provided between the push rod and the screw tail. The anti-loosening component includes a storage groove opened on the inner side of the screw tail. A sliding plate is fixedly connected to the outer surface of the push rod, and the sliding plate is limited to the storage groove. The sliding plate is annular. A spring is sleeved on the outer side of the push rod. The two ends of the spring abut against the inner wall of the sliding plate and the storage groove near the ball, respectively, and the initial state is a compressed state.
[0009] Optionally, a sealing assembly is provided between the first sphere and the second sphere. The sealing assembly includes a placement cavity opened inside the first sphere. A scraper seat is fixedly connected to the inner surface of the placement cavity. The outer surface of the second sphere is in rotatable contact with the scraper seat. Both the scraper seat and the placement cavity are annular.
[0010] Optionally, a limiting component is provided between the first ball and the second ball. The limiting component includes a cavity formed at the rear end of the push rod, a contact block slidably connected to the inner surface of the cavity, a second spring fixedly connected to the outer surface of the front end of the contact block, the end of the second spring away from the contact block being fixedly connected to the inner side of the cavity, and the outer surface of the contact block contacting the second ball.
[0011] Optionally, the contact block is made of an elastic wear-resistant material, and a limiting groove is formed on the outer surface of the contact block near the second sphere. A limiting block is embedded and fixedly connected to the outer surface of the second sphere. There are several sets of limiting blocks, and the limiting blocks are in the shape of a ring. The contact block engages with the limiting block through the limiting groove.
[0012] Optionally, an expansion assembly is provided inside the screw body. The expansion assembly includes pressure cracks formed on the outer surface of the screw body. The number of pressure cracks is several groups and they are distributed in a ring array. A support plate is fixedly connected to the lower side of the inner surface of the screw body. The support plate is ring-shaped, and a movable plate is rotatably connected to the upper outer surface of the support plate.
[0013] Optionally, a reciprocating screw is fixedly connected to the upper outer surface of the movable plate, and a pressing plate is helically connected to the outer surface of the reciprocating screw. The pressing plate slides in contact with the inner surface of the screw body. A baffle is fixedly connected to the upper end of the reciprocating screw. The outer surface of the pressing plate is inclined. A guide strip is fixedly connected to the inner surface of the screw body. The pressing plate slides in contact with the outer surface of the guide strip.
[0014] Optionally, a through groove is formed on the outer surface of the screw, a mandrel is fixedly connected to the inner surface of the through groove, a wheel is rotatably connected to the outer surface of the mandrel, an anti-slip groove is formed on the outer surface of the wheel, and the outer surface of the wheel is in rotatable contact with the side wall of the movable plate.
[0015] Optionally, the outer surface of the front end of the screw tail is provided with a first groove, the first groove having a cross-shaped structure, and the outer surface of the front end of the push rod is provided with a second groove, the second groove having a hexagonal structure, and both the first and second grooves are matched with the tightening tool.
[0016] Compared with the prior art, the technical solution provided by this invention has at least the following beneficial effects:
[0017] In the above solution, by setting a rotating component, a part of the sphere covers the outside of the second sphere, which can support the rotation of the second sphere and flexibly adjust the angle of the screw. This can effectively improve the flexibility and convenience of the screw during use, thereby enabling the fixation and repositioning of the cone at different angles, which helps to improve the application effect of the screw and effectively improve the repositioning accuracy of the cone.
[0018] By setting a limiting component, the friction between the push rod and the second ball can be increased through the limiting groove and the limiting block. This ensures that the rotation of the first and second balls is consistent during the screw-tightening process, which helps to reduce the probability of accidental slippage between the first and second balls, thereby improving the stability of the screw during use.
[0019] By incorporating an expansion component, the compression plate compresses the screw body after traveling a certain distance, causing the screw body to expand outward from the compression crack. This results in a tighter engagement between the screw body and the vertebral body, further improving the stability of the screw during implantation and reducing the probability of screw displacement. Attached Figure Description
[0020] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.
[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ;
[0022] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ;
[0023] Figure 3 This is a front view of the overall structure of the present invention;
[0024] Figure 4 This is a schematic diagram of the limiting block structure of the present invention;
[0025] Figure 5 This is a cross-sectional view of the overall structure of the present invention;
[0026] Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle;
[0027] Figure 7 For the present invention Figure 5 Enlarged view of point B in the middle;
[0028] Figure 8 For the present invention Figure 5 Enlarged diagram of point C in the middle.
[0029] [Figure Labels]
[0030] 11. Screw tail; 12. Ball one; 13. Groove one; 14. Groove two; 15. Ball two; 16. Screw body; 17. Movable plate; 18. Pressure crack; 19. Guide bar; 20. Extrusion plate; 21. Reciprocating screw; 22. Storage groove; 23. Spring one; 24. Slide plate; 25. Top rod; 26. Placement cavity; 27. Scraper seat; 28. Support plate; 29. Mandrel; 30. Rotary wheel; 31. Through groove; 32. Cavity; 33. Spring two; 34. Contact block; 35. Contact plate; 36. Limiting block; 37. Limiting groove.
[0031] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation
[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should also be noted that, to make the embodiments more comprehensive, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some well-known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.
[0033] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.
[0034] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.
[0035] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.
[0036] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.
[0037] like Figures 1 to 8 As shown, this embodiment of the invention provides a vertebral repositioning angle adjustable expansion screw, including a screw body 16. A second ball 15 is fixedly connected to the outer surface of the front end of the screw body 16. A rotating assembly is provided on the outer side of the second ball 15. The rotating assembly includes a first ball 12 that is rotatably connected to the outer surface of the second ball 15.
[0038] The following description uses the position of the screw body 16 as the rear and the position of the second ball 15 relative to the screw body 16 as the front. The front side of the outer surface of the first ball 12 is fixedly connected to the screw tail 11, and the inner side of the screw tail 11 is threadedly connected to the push rod 25. The outer surface of the push rod 25 near the second ball 15 is fixed with a contact plate 35, and the outer surface of the contact plate 35 has anti-slip texture.
[0039] The contact plate 35 has a fan-shaped structure and is made of elastic wear-resistant material. There are several groups of contact plates 35 and they are arranged in a ring array. The outer surface of the contact plate 35 is in close contact with the ball 15. The outer surface of the screw 16 is conical. The outer surface of the screw 16 is threaded and hollow inside.
[0040] The outer surface of the front end of the screw 11 has a slot 13, which is cross-shaped. The outer surface of the front end of the push rod 25 has a slot 14, which is hexagonal. Both slots 13 and 14 are compatible with tightening tools.
[0041] By adopting the above technical solution, the screw body 16, screw tail 11, and balls 12 and 15 constitute the main structure of the screw. Ball 12 partially covers the outside of ball 15, providing rotational support for ball 15. This allows for a significant adjustment of the angle between the screw body 16 and screw tail 11. When using the screw, first adjust the angle between the screw body 16 and screw tail 11 to an appropriate level. Then, the operator uses a screwing tool to screw the push rod 25 through the slot 2 14. The push rod 25, threadedly connected to the screw tail 11, moves towards ball 15 during rotation. During this movement, the push rod 25 drives the contact plates 35 to move synchronously, causing several sets of annularly distributed contact plates 35 to adhere to the surface of ball 15, thus establishing contact between the contact plates 35 and ball 15. Sufficient friction is generated between them. The anti-slip texture on the surface of the contact plate 35 can effectively increase the friction between it and the ball 15. Then, the operator turns the screw tail 11 through the slot 13. During the rotation of the screw tail 11, it will drive the contact plate 35 to rotate synchronously through the push rod 25. The friction between the contact plate 35 and the ball 15 can drive the ball 15 to rotate synchronously. Thus, the ball 15 can drive the screw body 16 at its rear end to rotate, so that the screw body 16 is fixed inside the patient's vertebral body through its surface threads. By setting the rotating component, the angle of the screw body 16 can be flexibly adjusted, which can effectively improve the flexibility and convenience of the screw during use. This allows the vertebral body to be fixed and repositioned at different angles, which helps to improve the application effect of the screw.
[0042] Specifically, such as Figure 5 As shown, an anti-loosening component is provided between the push rod 25 and the screw tail 11. The anti-loosening component includes a storage groove 22 opened on the inner side of the screw tail 11. A sliding plate 24 is fixedly connected to the outer surface of the push rod 25, and the sliding plate 24 is limited to the storage groove 22. The sliding plate 24 is annular. A spring 23 is sleeved on the outer side of the push rod 25. The two ends of the spring 23 abut against the inner wall of the sliding plate 24 and the storage groove 22 near the ball 12, respectively, and the initial state is a compressed state.
[0043] By adopting the above technical solution, in order to reduce the probability of screws loosening during long-term use, an anti-loosening component is set up. During the movement of the push rod 25, the slide plate 24 will move synchronously inside the storage groove 22. During the movement, the slide plate 24 will squeeze the spring 23. As the spring 23 is gradually compressed, the spring 23 will apply a certain elastic force to the slide plate 24, thereby increasing the friction between the push rod 25 and the screw tail 11. As a result, a greater external force is required to loosen the screw, thereby improving the stability and reliability of the screw during use and helping to further reduce the probability of the screw loosening unexpectedly.
[0044] Specifically, such as Figure 5 and Figure 6 As shown, a sealing assembly is provided between the first sphere 12 and the second sphere 15. The sealing assembly includes a placement cavity 26 opened inside the first sphere 12. A scraper seat 27 is fixedly connected to the inner surface of the placement cavity 26. The outer surface of the second sphere 15 is in rotatable contact with the scraper seat 27. Both the scraper seat 27 and the placement cavity 26 are annular.
[0045] By adopting the above technical solution, the first ball 12 is fixedly supported by the placement cavity 26 for the scraper seat 27. When the second ball 15 rotates inside the first ball 12, the scraper seat 27 will rotate and contact the outer surface of the second ball 15. The scraper seat 27 can wipe and clean the foreign matter remaining on the surface of the second ball 15, thereby effectively reducing the entry of foreign matter between the first ball 12 and the second ball 15, and thus improving the stability and smoothness of the rotation of the second ball 15 to a certain extent.
[0046] Specifically, such as Figure 5 and Figure 8 As shown, a limiting component is provided between the first sphere 12 and the second sphere 15. The limiting component includes a cavity 32 opened at the rear end of the top rod 25, a contact block 34 slidably connected to the inner surface of the cavity 32, a second spring 33 fixedly connected to the outer surface of the front end of the contact block 34, and the end of the second spring 33 away from the contact block 34 fixedly connected to the inner side of the cavity 32. The outer surface of the contact block 34 is in contact with the second sphere 15.
[0047] The contact block 34 is made of elastic wear-resistant material. A limiting groove 37 is opened on the outer surface of the contact block 34 near the sphere 15. A limiting block 36 is embedded and fixedly connected to the outer surface of the sphere 15. There are several sets of limiting blocks 36. The limiting blocks 36 are in the shape of a ring. The contact block 34 engages with the limiting block 36 through the limiting groove 37.
[0048] By adopting the above technical solution, in order to improve the friction between ball 12 and ball 25 and reduce the probability of slippage between them during screw tightening, a limiting component is set up. When the push rod 25 moves towards ball 25, the push rod 25 drives the contact block 34 to move synchronously through spring 23. Then, under the elastic force of spring 23, the contact block 34 comes into contact with the outer surface of ball 25. The limiting blocks 36 on the surface of ball 25 are composed of several concentric groups. The contact block 34 is composed of circles. After the push rod 25 rotates at a certain angle, the limiting block 36 will engage with the limiting groove 37 on the surface of the contact block 34. The limiting groove 37 and the limiting block 36 can further increase the friction between the push rod 25 and the second ball 15, so that the rotation of the first ball 12 and the second ball 15 can be consistent during the screw tightening process. This helps to reduce the probability of accidental slippage between the first ball 12 and the second ball 15, thereby improving the stability of the screw during use.
[0049] Specifically, such as Figure 5 and Figure 7 As shown, an expansion assembly is provided on the inner side of the screw body 16. The expansion assembly includes pressure cracks 18 formed on the outer surface of the screw body 16. The number of pressure cracks 18 is several groups and they are distributed in a ring array. A support plate 28 is fixedly connected to the lower side of the inner surface of the screw body 16. The support plate 28 is in the shape of a ring. A movable plate 17 is rotatably connected to the outer surface of the upper end of the support plate 28.
[0050] A reciprocating screw 21 is fixedly connected to the outer surface of the upper end of the movable plate 17. A pressing plate 20 is screw-driven to the outer surface of the reciprocating screw 21. The pressing plate 20 slides in contact with the inner surface of the screw body 16. A baffle is fixedly connected to the upper end of the reciprocating screw 21. The outer surface of the pressing plate 20 is inclined. A guide strip 19 is fixedly connected to the inner surface of the screw body 16. The pressing plate 20 slides in contact with the outer surface of the guide strip 19.
[0051] The outer surface of the screw body 16 has a through groove 31, the inner surface of the through groove 31 is fixedly connected to a spindle 29, the outer surface of the spindle 29 is rotatably connected to a wheel 30, the outer surface of the wheel 30 has an anti-slip groove, and the outer surface of the wheel 30 is in rotatable contact with the side wall of the movable plate 17.
[0052] By adopting the above technical solution, in order to improve the firmness during screw insertion, an expansion component is set up. The screw body 16 is fixedly installed on the mandrel 29 through the through groove 31. When the screw body 16 is expanded after the screw is inserted, the operator rotates the rotating wheel 30 with the mandrel 29 as the fulcrum. During the rotation, the rotating wheel 30 will rotate and contact the outer surface of the movable plate 17. The anti-slip groove on the surface of the rotating wheel 30 can effectively increase the friction between it and the movable plate 17. The support plate 28 inside the screw body 16 is used to support the movable plate 17. During the rotation of the movable plate 17 by the rotating wheel 30, it will drive the reciprocating screw 21 on its upper side. The compression plate 20 rotates synchronously and moves along the axis of the reciprocating screw 21 via a helical drive connection. The guide strip 19 inside the screw body 16 can limit the compression plate 20, allowing it to slide linearly inside the screw body 16. After moving a certain distance, the compression plate 20 will compress the screw body 16, causing it to expand outward from the pressure crack 18. This makes the screw body 16 fit more tightly with the inside of the vertebral body, thereby further improving the stability of the screw during implantation and reducing the probability of screw displacement.
[0053] The workflow of the technical solution of this invention is as follows:
[0054] During rotation, the screw tail 11 drives the contact plate 35 to rotate synchronously via the push rod 25. The friction between the contact plate 35 and the ball 15 drives the ball 15 to rotate synchronously, which in turn drives the screw 16 at its rear end to rotate. This allows the screw 16 to be fixed inside the patient's vertebral body through its threads. During movement, the sliding plate 24 compresses the spring 23. As the spring 23 gradually compresses, it applies a certain elastic force to the sliding plate 24, thereby increasing the friction between the push rod 25 and the screw tail 11. This requires a greater external force to loosen the screw, thus improving the stability and reliability of the screw during use. The scraper seat 27 rotates and contacts the outer surface of the ball 15, removing any foreign matter remaining on the surface of the ball 15. Wiping and cleaning effectively reduces the entry of foreign objects between sphere 12 and sphere 25. After the contact block 34 rotates a certain angle with the push rod 25, the limiting block 36 will engage with the limiting groove 37 on the surface of the contact block 34. The limiting groove 37 and the limiting block 36 can further increase the friction between the push rod 25 and sphere 25, so that the rotation of sphere 12 and sphere 25 can be consistent during the screw tightening process. The extrusion plate 20 is connected to the reciprocating screw 21 by screw drive and moves along the axis of the reciprocating screw 21 as the reciprocating screw 21 rotates. The extrusion plate 20 will extrude the screw body 16, so that the screw body 16 expands outward from the pressure crack 18, so that the screw body 16 engages more tightly with the inside of the vertebral body, thereby further improving the stability of the screw during the implantation process.
[0055] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.
[0056] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
Claims
1. A vertebral body reduction angle adjustable distraction screw comprising a screw body, characterized by: The outer surface of the front end of the screw body is fixedly connected with a sphere two, a rotating assembly is arranged on the outer side of the sphere two, the rotating assembly comprises a sphere one which is rotatably connected with the outer surface of the sphere two, a screw tail is fixedly connected with the outer surface of the sphere one on the front side, a top rod is threadedly connected with the inner side of the screw tail, a contact plate is fixedly connected with the outer surface of the top rod close to the sphere two, and the outer surface of the contact plate has anti-skid lines.
2. The angle-adjustable vertebral body reducing distraction screw according to claim 1, wherein, The contact plate is in a fan-shaped structure and is made of elastic wear-resistant material, the number of the contact plates is several groups and is distributed in a ring array, the outer surface of the contact plate is in contact with the sphere two, the outer surface of the screw body is conical, the outer surface of the screw body is provided with threads and is hollow inside.
3. The angle-adjustable vertebral body reducing distraction screw according to claim 2, wherein, A loosening prevention assembly is arranged between the top rod and the screw tail, the loosening prevention assembly comprises a receiving groove which is arranged on the inner side of the screw tail, the outer surface of the top rod is fixedly connected with a sliding plate, the sliding plate is limited in the receiving groove, the sliding plate is in a circular ring shape, a spring one is arranged on the outer side of the top rod, the two ends of the spring one are respectively in abutment with the sliding plate and the inner wall of the receiving groove close to the sphere one, and the initial state is a compressed state.
4. The angle-adjustable vertebral body reducing distraction screw according to claim 3, wherein, A sealing assembly is arranged between the sphere one and the sphere two, the sealing assembly comprises a placing cavity which is arranged on the inner side of the sphere one, a scraping seat is fixedly connected with the inner surface of the placing cavity, the outer surface of the sphere two is in rotational contact with the scraping seat, and the scraping seat and the placing cavity are both in a circular ring shape.
5. The angle-adjustable vertebral body reducing distraction screw according to claim 4, wherein, A limiting assembly is arranged between the sphere one and the sphere two, the limiting assembly comprises a cavity which is arranged on the rear end of the top rod, a contact block is slidably connected with the inner surface of the cavity, a spring two is fixedly connected with the outer surface of the front end of the contact block, the end of the spring two away from the contact block is fixedly connected with the inner side of the cavity, and the outer surface of the contact block is in contact with the sphere two.
6. The angle-adjustable vertebral body reduction spacer screw of claim 5, wherein, The contact block is made of elastic wear-resistant material, a limiting groove is arranged on the outer surface of the contact block close to the sphere two, a limiting block is fixedly connected with the outer surface of the sphere two in a clamping mode, the number of the limiting blocks is several groups, the limiting blocks are in a circular ring shape, and the contact block is in clamping contact with the limiting blocks through the limiting groove.
7. The angle-adjustable vertebral body reducing distraction screw of claim 6, wherein, An expanding assembly is arranged on the inner side of the screw body, the expanding assembly comprises a pressure fracture which is arranged on the outer surface of the screw body, the number of the pressure fractures is several groups and is distributed in a ring array, a supporting plate is fixedly connected with the lower side of the inner surface of the screw body, the supporting plate is in a circular ring shape, and a movable plate is rotatably connected with the outer surface of the upper end of the supporting plate.
8. The angle-adjustable vertebral body reduction spacer screw of claim 7, wherein, A reciprocating screw rod is fixedly connected with the outer surface of the upper end of the movable plate, an extruding plate is screwingly and transmissionally connected with the outer surface of the reciprocating screw rod, the extruding plate is in sliding contact with the inner surface of the screw body, a baffle is fixedly connected with the upper end of the reciprocating screw rod, the outer surface of the extruding plate is in an inclined shape, a guide strip is fixedly connected with the inner surface of the screw body, and the extruding plate is in sliding contact with the outer surface of the guide strip.
9. The angle-adjustable vertebral body reducing distraction screw according to claim 8, wherein, A through groove is arranged through the outer surface of the screw body, a mandrel is fixedly connected with the inner surface of the through groove, a rotating wheel is rotatably connected with the outer surface of the mandrel, an anti-skid groove is arranged on the outer surface of the rotating wheel, and the outer surface of the rotating wheel is in rotational contact with the side wall of the movable plate.
10. The angle-adjustable vertebral body reducing distraction screw of claim 9, wherein, The outer surface of the front end of the screw tail is provided with a notch one, the notch one is a cross-shaped structure, the outer surface of the front end of the top rod is provided with a notch two, the notch two is a hexagonal structure, and the notch one and the notch two are matched with the tightening tool.