A posterior reduction and internal fixation system

Abstract

The invention discloses a posterior reduction internal fixation system, comprising two vertebral orthopedic rods arranged in parallel and an adjusting device. During operation, the connecting rods of the two vertebral orthopedic rods are connected to the vertebral body, and the occipital plate is connected to the occipital bone, so as to realize the connection between the posterior reduction internal fixation system and the occipital bone and the vertebral body; the base assembly is connected to the pedicle screw close to the occipital bone, and the connecting assembly is connected to the occipital screw; the inclination angle between the occipital plate and the connecting rod is adjusted, specifically, the connecting rod is driven to move by the first linear driving assembly, so that the first retractor and the second retractor are respectively connected to the two occipital screws on the occipital bone, and the first linear driving assembly is driven to move by the second linear driving assembly, and the first linear driving assembly drives the connecting rod and the first retractor and the second retractor on the connecting rod to move, and the occipital bone is pulled and pulled, so that the inclination angle between the occipital plate and the connecting rod is in accordance with the anatomical structure of the human occipital bone and cervical vertebrae, so as to realize the posterior reduction internal fixation.

Description

Technical Field

[0001] The present invention relates to the field of medical device technology, and in particular to a posterior reduction and internal fixation system. Background Technology

[0002] Basilar invagination is a congenital malformation of the craniocervical junction. The clinical manifestation is that the skull base bone around the foramen magnum sinks upward into the cranial cavity, forcing the atlas (odontoid process) below it to rise and enter the skull base. It may be combined with other bone developmental abnormalities in the area and abnormal neural structures.

[0003] Patients often have an increase in the distance between the atlanto-dentus and the odontoid process, with the tip of the odontoid process extending beyond the line connecting the posterior edge of the hard palate and the posterior superior edge of the foramen magnum, which results in a relatively narrow anterior-posterior diameter of the foramen magnum, compression of the medulla oblongata and the upper spinal cord, and corresponding symptoms of spinal cord injury. In severe cases, respiratory dysfunction may occur, leading to death.

[0004] Clinically, posterior foramen magnum expansion and decompression combined with in situ occipitocervical fusion and internal fixation are often used, or anterior transoral odontoid resection or atlantoaxial joint release and reduction combined with posterior fixation occipitocervical fusion to achieve occipital and atlantoaxial reduction, but the above techniques are highly traumatic and risky.

[0005] Currently, some scholars use simple posterior reduction to release and fix the atlantoaxial lateral mass to achieve atlantoaxial reduction and correct deformity. This technique has low trauma and relatively low risk, but lacks a convenient and effective posterior reduction and internal fixation system.

[0006] Therefore, how to achieve posterior reduction and internal fixation has become a technical problem that needs to be solved urgently by those skilled in the art. SUMMARY OF THE INVENTION

[0007] In view of this, the present invention provides a posterior reduction and internal fixation system to achieve posterior reduction and internal fixation.

[0008] To achieve the above purpose, the present invention provides the following technical solutions:

[0009] A posterior reduction internal fixation system, comprising two parallel vertebral correction rods and an adjustment device,

[0010] The vertebral correction rod includes a connecting rod and an occipital plate,

[0011] The connecting rod can be connected to the pedicles on the same side of at least two vertebrae from the third to the seventh vertebrae through pedicle screws;

[0012] The occipital plate can be connected to the occipital bone through an occipital screw, the occipital plate is arranged along the length extension direction of the connecting rod and is connected to the connecting rod, and the occipital plate is arranged obliquely relative to the connecting rod;

[0013] The adjusting device is used to adjust the inclination angle of the occipital plate relative to the connecting rod. The adjusting device includes a base assembly, a connecting assembly and a fine-tuning assembly.

[0014] The base assembly is connected to the connecting rod;

[0015] The connecting assembly includes a first hook, a second hook and a connecting rod.

[0016] The connecting rod is perpendicular to the connecting rod.

[0017] The first hook and the second hook are parallel and perpendicular to the connecting rod. The hook ends of the first hook and the second hook are respectively connected to the two occipital screws. The fixed ends of the first hook and the second hook are connected to the connecting rod through a rotating block. A first threaded hole is provided on the rotating block, and a first locking bolt for locking the rotating block on the connecting rod is provided in the first threaded hole.

[0018] The fine-tuning assembly includes a first linear drive assembly and a second linear drive assembly.

[0019] The first linear drive assembly is connected to the connecting rod and is used to drive the connecting rod to move in a direction perpendicular to the connecting rod, so as to adjust the angle between the first hook and the second hook and the occipital screw.

[0020] The second linear drive assembly is connected to the first linear drive assembly and is used to drive the first linear drive assembly to move in a direction parallel to the connecting rod, so as to adjust the inclination angle between the occipital plate and the connecting rod. The second linear drive assembly is installed on the base assembly.

[0021] Preferably, in the above posterior reduction and internal fixation system, the base assembly includes a hook arm, a support rod, a sliding beam and a first slider.

[0022] The sliding beam is perpendicular to the connecting rod.

[0023] There are two first sliders which are slidably arranged at both ends of the sliding beam in the length direction. A second threaded hole is provided on the first slider, and a second locking bolt is arranged in the second threaded hole. The first slider is locked on the sliding beam through the second locking bolt. A third threaded hole is provided on the first slider. A threaded section matching the third threaded hole is provided at the first end of the length direction of the support rod. The first end of the support rod is connected to the first slider through the threaded section. The second end of the length direction of the support rod can abut against the plug of the pedicle screw. At least two hook arms are provided on each first slider. The hook arms are parallel to the support rod. The first end of the length direction of the hook arm is connected to the first slider, and a hook for lifting the connecting rod is provided at the second end of the length direction of the hook arm.

[0024] Preferably, in the above posterior approach reduction and internal fixation system, a connecting block is provided in the middle of the sliding beam. A sliding hole is provided on the connecting block, and the axial direction of the sliding hole is parallel to the driving direction of the second linear driving component;

[0025] The second linear driving component includes a first fixed block, a first lead screw and guide rods.

[0026] There are two guide rods. The first lead screw is located between the two guide rods and is parallel to the guide rods. The first ends of the axial directions of the guide rods and the first lead screw pass through the sliding hole and are connected to the first linear driving component. The second ends of the axial directions of the guide rods and the first lead screw are connected to the first fixed block. A fourth threaded hole matching the first lead screw is provided on the first fixed block.

[0027] Preferably, in the above posterior approach reduction and internal fixation system, the second linear driving component further includes a second fixed block, which is connected to the first linear driving component. Three first mounting holes corresponding to the positions of the guide rods and the first lead screw are provided on the second fixed block.

[0028] Preferably, in the above posterior approach reduction and internal fixation system, a reinforcing plate is provided on the second fixed block. The reinforcing plate is a right-angled triangular prism plate, and the two right-angled surfaces of the reinforcing plate are respectively connected to the first linear driving component and the second fixed block.

[0029] Preferably, in the above posterior approach reduction and internal fixation system, a first limit bolt is provided at the end of the sliding beam for limiting the first slider.

[0030] Preferably, in the above posterior approach reduction and internal fixation system, the first linear driving component includes a third fixed block and a second lead screw.

[0031] A slideway perpendicular to the connecting rod is formed in the third fixing block. The connecting rod passes through the slideway horizontally. A second mounting hole coaxial with the slideway is formed in the third fixing block. The side wall of the third fixing block is connected to the right-angle surface of the reinforcing plate;

[0032] The first end in the axial direction of the second lead screw is inserted into the slideway through the second mounting hole and connected to the connecting rod. A fifth threaded hole matching the second lead screw is formed in the connecting rod. The second end in the axial direction of the second lead screw is located outside the slideway.

[0033] Preferably, in the above posterior approach reduction and internal fixation system, the connecting rod includes a first connecting rod and a second connecting rod arranged coaxially. Two of the rotating blocks are respectively arranged on the first connecting rod and the second connecting rod.

[0034] The first linear drive assembly further includes a second slider located between the first connecting rod and the second connecting rod and connected to the first connecting rod and the second connecting rod. The fifth threaded hole is formed in the second slider. The second lead screw is connected to the second slider through the fifth threaded hole to drive the second slider to slide along the slideway.

[0035] Preferably, in the above posterior approach reduction and internal fixation system, second limit bolts are arranged at both ends of the connecting rod to limit the rotating blocks.

[0036] Preferably, in the above posterior approach reduction and internal fixation system, a plurality of third mounting holes matching the occipital bone screws are formed in the occipital bone plate. The plurality of third mounting holes are arranged in sequence along the length direction of the occipital bone plate. The third mounting holes are long-strip-shaped mounting holes.

[0037] As can be seen from the above technical solutions, the posterior reduction and internal fixation system provided by the present invention includes two vertebral orthopedic rods arranged in parallel and an adjusting device. The adjusting device includes a base assembly, a connecting assembly, and a fine-tuning assembly. The fine-tuning assembly includes a first linear driving assembly and a second linear driving assembly. During specific operations, in step one, the connecting rods of the two vertebral orthopedic rods are connected to at least two vertebrae among the third to seventh vertebrae through pedicle screws, and the occipital plate is connected to the occipital bone through occipital screws, so as to realize the connection of the posterior reduction and internal fixation system with the occipital bone and the vertebrae; in step two, the base assembly is connected to the pedicle screw close to the occipital bone, and the connecting assembly is connected to the occipital screw; in step three, the inclination angle between the occipital plate and the connecting rod is adjusted. Step three specifically is that the connecting rod is driven to move by the first linear driving assembly, so that the first hook and the second hook are respectively connected to the two occipital screws on the occipital bone, and the first linear driving assembly is driven to move by the second linear driving assembly. The first linear driving assembly drives the connecting rod and the first hook and the second hook on the connecting rod to move, so as to lift and traction the occipital bone, and make the inclination angle between the occipital plate and the connecting rod conform to the anatomical structure of the human occipital bone and cervical vertebra, thereby realizing posterior reduction and internal fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0039] Figure 1 It is a schematic structural diagram of the posterior reduction and internal fixation system provided by the embodiment of the present invention;

[0040] Figure 2 It is a schematic structural diagram of the vertebral orthopedic rod provided by the embodiment of the present invention;

[0041] Figure 3 It is a schematic structural diagram of the adjusting device provided by the embodiment of the present invention;

[0042] Figure 4 It is a schematic structural diagram of the adjusting device provided by the embodiment of the present invention;

[0043] Figure 5 It is a schematic structural diagram of the base assembly provided by the embodiment of the present invention;

[0044] Figure 6 It is a schematic structural diagram of the connection between the hook arm and the first slider provided by the embodiment of the present invention;

[0045] Figure 7 It is a schematic structural diagram of the cooperation between the sliding beam and the connecting block provided by the embodiment of the present invention;

[0046] Figure 8 Structural schematic diagram of the connection component provided by an embodiment of the present invention;

[0047] Figure 9 Structural schematic diagram of the connection between the first hook and the rotating block provided by an embodiment of the present invention;

[0048] Figure 10 Structural schematic diagram of the fine-tuning component provided by an embodiment of the present invention;

[0049] Figure 11 Structural schematic diagram of the connection between the second fixing block and the third fixing block provided by an embodiment of the present invention.

[0050] Among them,

[0051] 1. Vertebral orthopedic rod, 11. Connecting rod, 12. Occipital plate, 2. Adjusting device, 21. Base assembly, 211. Hook arm, 212. Support rod, 213. Sliding beam, 214. First slider, 215. Second locking bolt, 216. Connecting block, 217. First limit bolt, 22. Connection component, 221. First hook, 222. Second hook, 223. Connecting rod, 224. Rotating block, 225. First locking bolt, 226. Second limit bolt, 23. Fine-tuning component, 231. First linear drive component, 2311. Third fixing block, 2312. Second lead screw, 2313. Second slider, 232. Second linear drive component, 2321. First fixing block, 2322. First lead screw, 2323. Guide rod, 2324. Second fixing block, 2325. Reinforcing plate, 3. Pedicle screw, 4. Occipital screw. Specific embodiments

[0052] The present invention discloses a posterior reduction and internal fixation system to achieve posterior reduction and internal fixation.

[0053] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0054] Please refer to Figures 1-11 . The present invention discloses a posterior reduction and internal fixation system for performing separate posterior reduction and internal fixation, achieving the lifting and corrective reduction of the occiput or atlantoaxial vertebra, and assisting the implementation of the simple posterior reduction method.

[0055] The posterior reduction and internal fixation system disclosed in this solution includes two parallel vertebral orthopedic rods 1 and an adjusting device 2.

[0056] The vertebral orthopedic rod 1 is located on both sides of the spine and can be connected to the occipital bone and the pedicles of the vertebrae.

[0057] As Figure 1 and 2 shown, the vertebral orthopedic rod 1 includes a connecting rod 11 and an occipital plate 12.

[0058] The connecting rod 11 can be connected to the pedicles of the vertebrae. The two connecting rods 11 of the two vertebral orthopedic rods 1 are arranged in parallel on both sides of the spine. Specifically, the connecting rod 11 is connected to at least two vertebrae among the third to seventh vertebrae through pedicle screws 3, and the connecting rod 11 is connected to the pedicles on the same side of at least two vertebrae.

[0059] It should be noted here that pedicle screws 3 are provided on at least two vertebrae among the third to seventh vertebrae. That is to say, pedicle screws 3 are provided on at least two vertebrae among the third to seventh vertebrae. The meaning of at least two is that the vertebrae on which the pedicle screws 3 are provided can be two, three, or four, and the pedicle screws 3 can be provided on all five vertebrae from the third to the seventh vertebrae. Which vertebrae the pedicle screws 3 are specifically provided on is set by those skilled in the art according to actual needs.

[0060] The occipital plate 12 can be connected to the occipital bone through occipital screws 4. The two occipital plates 12 of the two vertebral orthopedic rods 1 are respectively connected to both ends of the occipital bone. As Figure 2 shown, the occipital plate 12 is arranged along the length extension direction of the connecting rod 11, and the occipital plate 12 is connected to the connecting rod 11, and the occipital plate 12 is arranged obliquely with respect to the connecting rod 11. It should be noted here that the inclination angle between the occipital plate 12 and the connecting rod 11 needs to conform to the anatomical structure of the human occipital bone and cervical vertebra.

[0061] Preferably, the occipital plate 12 and the connecting rod 11 are integrally formed.

[0062] The adjusting device 2 includes a base assembly 21, a connecting assembly 22, and a fine-tuning assembly 23, and is used to make the inclination angle between the occipital plate 12 and the connecting rod 11 adjustable.

[0063] The base assembly 21 is connected to the connecting rod 11, the fine-tuning assembly 23 is connected to both the base assembly 21 and the connecting assembly 22, and the connecting assembly 22 is connected to the occipital screw 4.

[0064] Preferably, the base assembly 21 is connected to the pedicle screw 3 close to the occipital bone and avoids the pedicle screw 3 at the connection position of the occipital plate 12 and the connecting rod 11. As Figure 1 shown, the base assembly 21 is connected to the second group of pedicle screws 3 on the connecting rod 11.

[0065] In a specific embodiment of this solution, the connection component 22 includes a first hook 221, a second hook 222, and a connecting rod 223. The connecting rod 223 is perpendicular to the connecting rod 11 and parallel to the plane where the two connecting rods 11 are located, that is, the patient's spine. The first hook 221 and the second hook 222 are respectively arranged at both ends of the connecting rod 223.

[0066] The first hook 221 and the second hook 222 are parallel. The hooked ends of the first hook 221 and the second hook 222 are respectively connected to two occipital screws 4 on the occipital bone. The fixed ends of the first hook 221 and the second hook 222 are connected to the connecting rod 223 through a rotating block 224. In this solution, the rotating block 224 can rotate circumferentially around the connecting rod 223, so as to realize the angle between the first hook 221 and the second hook 222 and the occipital screws 4, and ensure that the angles between the first hook 221 and the second hook 222 and the occipital screws 4 are the same.

[0067] By connecting the first hook 221 and the second hook 222 through the connecting rod 223, the first hook 221 and the second hook 222 are located at the same height, ensuring that the pulling forces and pulling angles of the first hook 221 and the second hook 222 on the occipital bone are the same.

[0068] The first hook 221 and the second hook 222 only rotate when the angle between them and the occipital screws 4 needs to be adjusted. When the angle between them and the occipital screws 4 does not need to be adjusted, they do not rotate to ensure the stability of the posterior reduction internal fixation system. In this solution, a first threaded hole is provided in the rotating block 224, and a first locking bolt 225 is arranged in the first threaded hole. When the angle between the first hook 221 and the second hook 222 and the occipital screws 4 does not need to be adjusted, the first locking bolt 225 is screwed to make the first locking bolt 225 abut against the connecting rod 223, realizing the locking of the rotating block 224 on the connecting rod 223.

[0069] As Figure 1 、 3 As shown in 4, 8, and 9, the rotating block 224 is a cubic rotating block. The rotating block 224 is coaxially arranged with the connecting rod 223. The first hook 221 or the second hook 222 is connected to the first side wall of the rotating block 224 parallel to the axis of the connecting rod 223. The first locking bolt 225 is arranged on the second side wall of the rotating block 224 opposite to the first side wall. Specifically, a first bolt hole is provided on the second side wall, and the first locking bolt 225 is located in the first bolt hole. The first locking bolt 225 can abut against the rod wall of the connecting rod 223 to prevent the rotating block 224 from rotating on the connecting rod 223. In this solution, the connecting rod 223 is a cylindrical connecting rod 223.

[0070] In a specific embodiment of this solution, the fine-tuning component 23 includes a first linear drive component 231 and a second linear drive component 232.

[0071] The first linear drive assembly 231 is connected to the connecting rod 223 and is used to drive the connecting rod 223 to move in a direction perpendicular to the connecting rod 11, so as to adjust the distance between the first hook 221 and the second hook 222 and the occipital screw 4, and realize the cooperation between the first hook 221 and the second hook 222 and the occipital screw 4.

[0072] The second linear drive assembly 232 is connected to the first linear drive assembly 231 and is used to drive the first linear drive assembly 231 to move in a direction parallel to the connecting rod 11, so as to adjust the inclination angle between the occipital plate 12 and the connecting rod 11, so that the occipital plate 12 can lift and traction the occipital bone. The second linear drive assembly 232 is installed on the base assembly 21.

[0073] The posterior reduction and internal fixation system disclosed in this solution includes two parallel vertebral orthopedic rods 1 and an adjusting device 2. The adjusting device 2 includes a base assembly 21, a connecting assembly 22 and a fine-tuning assembly 23. The fine-tuning assembly 23 includes a first linear drive assembly 231 and a second linear drive assembly 232. During specific operation, in step one, the connecting rods 11 of the two vertebral orthopedic rods 1 are connected to at least two vertebrae among the third to seventh vertebrae through pedicle screws 3, and the occipital plate 12 is connected to the occipital bone through occipital screws 4, so as to realize the connection between the posterior reduction and internal fixation system and the occipital bone and the vertebrae; in step two, the base assembly 21 is connected to the pedicle screw 3 close to the occipital bone, and the connecting assembly 22 is connected to the occipital screw 4; in step three, the inclination angle between the occipital plate 12 and the connecting rod 11 is adjusted. Step three specifically is that the connecting rod 223 is driven to move by the first linear drive assembly 231, so that the first hook 221 and the second hook 222 are respectively connected to the two occipital screws 4 on the occipital bone, and the first linear drive assembly 231 is driven to move by the second linear drive assembly 232. The first linear drive assembly 231 drives the connecting rod 223 and the first hook 221 and the second hook 222 on the connecting rod 223 to move, so as to lift and traction the occipital bone, so that the inclination angle between the occipital plate 12 and the connecting rod 11 conforms to the anatomical structure of the human occipital bone and cervical vertebra, and realize posterior reduction and internal fixation.

[0074] It should be noted here that during the driving process of the first linear drive assembly 231 and the second linear drive assembly 232, the first hook 221 and the second hook 222 and the connecting rod 223 are always in a rotational cooperation state. After the driving process of the first drive assembly and the second drive assembly ends, the rotating block 224 is locked on the connecting rod 223 through the first locking bolt 225.

[0075] This solution uses at least two vertebral traction pillows from the third vertebra to the seventh vertebra to traction the occipital bone, and then utilizes the linkage effect of the occipital bone on the atlantoaxial joint to achieve the lifting, correction, and reduction of the atlas. At this time, the corresponding supporting implants can be used to controllably achieve the lifting, correction, and reduction of the occipital bone and the atlantoaxial joint. Finally, the adjusting device 2 is removed from the vertebral orthopedic rod 1. The posterior reduction and internal fixation system disclosed in this solution slowly and gently adjusts the inclination angle between the occipital plate 12 and the vertebral orthopedic rod 1 through the adjusting component, avoiding damaging the human body. At the same time, by utilizing the combined action of the occipital bone and the third to seventh vertebrae and the linkage effect of the occipital bone on the atlas, the surgical difficulty and risk of implanting pedicle screws 3 into the atlantoaxial joint are avoided by pulling the occipital bone.

[0076] In this solution, the hook ends of the first hook 221 and the second hook 222 are ball-and-socket-shaped hooks.

[0077] In a specific embodiment of this solution, the base assembly 21 includes a hook arm 211, a support rod 212, a sliding beam 213, and a first slider 214.

[0078] As Figure 1 shown, the sliding beam 213 is perpendicular to the connecting rod 11 and parallel to the plane where the two connecting rods 11 are located; the number of the first sliders 214 is two and they are slidably arranged at both ends of the sliding beam 213 in the length direction. The first sliders 214 are provided with second threaded holes, and second locking bolts 215 are arranged in the second threaded holes. The first sliders 214 are locked on the sliding beam 213 through the second bolts that cooperate with the second threaded holes, preventing the first sliders 214 from sliding on the sliding beam 213;

[0079] The first sliders 214 are also provided with third threaded holes. The first end of the support rod 212 in the length direction is provided with a threaded section. The first end of the support rod 212 is connected to the first slider 214 through the threaded section that cooperates with the third threaded hole. The second end of the support rod 212 in the length direction can abut against the plug of the pedicle screw 3. Specifically, by rotating the support rod 212, the threaded section of the support rod 212 rotates in the third threaded hole, realizing the movement of the support rod 212 on the first slider 214 along its own axis, so that the second end of the support rod 212 abuts against or does not abut against the plug;

[0080] At least two hook arms 211 are provided on each first slider 214. The hook arms 211 are parallel to the support rod 212, and the support rod 212 is located between the two hook arms 211. The first end in the length direction of the hook arm 211 is connected to the first slider 214, and a hook (or a hook) is provided at the second end in the length direction of the hook arm 211. The hook can hook onto the connecting rod 11. The threaded section of the support rod 212 rotates in the third threaded hole, and the second end of the support rod 212 abuts against the plug. At this time, when the support rod 212 is further rotated, the support rod 212 jacks up the sliding beam 213 until the second end of the hook arm 211 can lift the connecting rod 11. At this time, the connection between the base assembly 21 and the connecting rod 11 is completed.

[0081] In this solution, the connection between the base assembly 21 and the connecting rod 11 is a movable connection, which can facilitate the installation and disassembly of the base assembly 21 on the connecting rod 11, and the connection strength can be adjusted in real time according to needs, and can be loosened or tightened, and the adjustment is safe and convenient.

[0082] In addition, the connection between the support rod 212 and the first slider 214 is similar to the cooperation between a lead screw and a nut. The rotation of the support rod 212 realizes the locking of the hook arm 211 on the connecting rod 11, and the adjustment accuracy is high.

[0083] In a specific embodiment of this solution, a connection block 216 is provided in the middle of the sliding beam 213. A sliding hole is provided on the connection block 216, and the axis of the sliding hole is parallel to the driving direction of the second linear driving component 232.

[0084] The connection block 216 provides an installation basis for the second linear driving component 232.

[0085] In this solution, the second linear driving component 232 includes a first fixing block 2321, a first lead screw 2322 and a guide rod 2323.

[0086] As Figure 1 、 3 、shown in 4 and 10, the number of the first lead screws 2322 is one, the number of the guide rods 2323 is two, the first lead screw 2322 is parallel to the guide rod 2323, the first lead screw 2322 is located between the two guide rods 2323, the first ends in the axial direction of the guide rod 2323 and the first lead screw 2322 pass through the sliding hole and are connected to the first linear driving component 231, and the second ends in the axial direction of the guide rod 2323 and the first lead screw 2322 are connected to the first fixing block 2321. A fourth threaded hole matching the first lead screw 2322 is provided on the first fixing block 2321.

[0087] Preferably, the number of the sliding holes on the connection block 216 is three, and they correspond to the positions of the first lead screw 2322 and the guide rod 2323 respectively.

[0088] The driving process of the second linear driving component 232 is as follows:

[0089] The first lead screw 2322 rotates in the fourth threaded hole of the first fixing block 2321, causing the first fixing block 2321 to move along the axis of the first lead screw 2322. Furthermore, the first fixing block 2321 drives the connecting rod 2323 connected thereto, and the connecting rod 2323 drives the first linear driving component 231 connected thereto. Finally, the first linear driving component 231 drives the connecting rod 223 to move along the axis direction of the connecting rod 11.

[0090] The second linear driving component 232 can drive the connecting rod 223 to move towards the occipital plate 12 and also drive the connecting rod 223 to move away from the occipital plate 12, that is, it can increase the inclination angle between the occipital plate 12 and the connecting rod 11 and also decrease the inclination angle between the occipital plate 12 and the connecting rod 11.

[0091] The second linear driving component 232 is driven by the first lead screw 2322, so that the adjustment accuracy of the inclination angle between the occipital plate 12 and the connecting rod 11 is high.

[0092] In a specific embodiment of this solution, as Figure 10 shown, the second linear driving component 232 further includes a second fixing block 2324, and the second fixing block 2324 is connected to the first linear driving component 231.

[0093] The design of the second fixing block 2324 provides an installation basis for the installation of the second linear driving component 232 on the first linear driving component 231. In order to fix the first lead screw 2322 and the connecting rod 2323, three first mounting holes are opened on the second fixing block 2324, and the positions of the three first mounting holes correspond to the positions of the first lead screw 2322 and the two connecting rods 2323 respectively.

[0094] In order to improve the connection strength between the second fixing block 2324 and the first linear driving component 231, a reinforcing plate 2325 is provided on the second fixing block 2324.

[0095] In this solution, the second linear driving component 232 is not limited to the above structure, and can also be other structures that can drive the first linear driving component 231 to move in a direction parallel to the connecting rod 11. The specific structure is not limited here and is selected by those skilled in the art according to actual needs.

[0096] As Figure 10 and 11 shown, the reinforcing plate 2325 is a right triangular prism plate, and the two right-angled surfaces of the reinforcing plate 2325 are respectively connected to the first linear driving component 231 and the second fixing block 2324.

[0097] There are two reinforcing plates 2325, and they are symmetrically distributed on both sides of the second fixing block 2324.

[0098] To prevent the first slider 214 from detaching from the sliding beam 213, a first limit bolt 217 is provided at the end of the sliding beam 213 in this solution. As Figure 5 shown, the first limit bolt 217 is coaxially arranged with the sliding beam 213, and the diameter of the bolt head of the first limit bolt 217 is larger than the diameter of the sliding beam 213.

[0099] In a specific embodiment of this solution, the sliding beam 213 is a cuboid-shaped sliding beam 213, and the cuboid-shaped sliding beam 213 enables the first slider 214 to slide along the axial direction of the sliding beam 213 and not to rotate circumferentially around the sliding beam 213.

[0100] In a specific embodiment of this solution, as Figure 1 , 3 , 4 and 10 shown, the first linear drive assembly 231 includes a third fixing block 2311 and a second lead screw 2312.

[0101] A slideway perpendicular to the connecting rod 223 is opened in the third fixing block 2311, and the connecting rod 223 passes through the slideway horizontally. The connecting rod 223 can move in the slideway in a direction perpendicular to the connecting rod 11;

[0102] The side wall of the third fixing block 2311 is connected to the right-angled surface of the reinforcing plate 2325;

[0103] A second mounting hole coaxial with the slideway is opened on the third fixing block 2311. The first end in the axial direction of the second lead screw 2312 is inserted into the slideway through the second mounting hole and connected to the connecting rod 223. A fifth threaded hole matching the second lead screw 2312 is opened on the connecting rod 223, and the second end in the axial direction of the second lead screw 2312 is located outside the slideway.

[0104] The second lead screw 2312 rotates in the fifth threaded hole, enabling the connecting rod 223 to move along the axial direction of the second lead screw 2312, enabling the first hook 221 and the second hook 222 connected to the connecting rod 223 to move in a direction perpendicular to the connecting rod 11, and enabling the cooperation between the first hook 221 and the second hook 222 and the occipital screw 4.

[0105] Adopting the method of driving the connecting rod 223 to move up and down by a lead screw has a simple structure and high adjustment accuracy.

[0106] As Figure 10As shown, the third fixing block 2311 is a cuboid fixing block. The slideway is opened along the length extension direction of the cuboid fixing block, and does not penetrate the end face of the cuboid fixing block in the length direction. However, rectangular through holes are opened on both side faces that are parallel to the axis and arranged oppositely, which is convenient for observing the movement of the connecting rod 223 inside the third fixing block 2311. One of the other two side faces of the third fixing block 2311 that are parallel to the axis and arranged oppositely is connected to the second linear determination component 232.

[0107] To improve the movement stability of the connecting rod 223 in the slideway, the first linear drive component 231 disclosed in this solution further includes a second slider 2313, and the shape of the second slider 2313 is the same as the cross-sectional shape of the slideway.

[0108] To facilitate the connection between the connecting rod 223 and the second slider 2313, the connecting rod 223 in this solution is a separately arranged first connecting rod and second connecting rod, and the first connecting rod and the second connecting rod are coaxially arranged. One end of the first connecting rod is connected to the first hook 221, the other end of the first connecting rod is connected to one of the rotating blocks 224, one end of the second connecting rod is connected to the second hook 222, and the other end of the second connecting rod is connected to the other rotating block 224. Preferably, the first connecting rod and the second connecting rod are cylindrical connecting rods 223.

[0109] When connecting, the second slider 2313 is located between the first connecting rod and the second connecting rod and is connected to the first connecting rod and the second connecting rod. After the connection is completed, the first connecting rod and the second connecting rod are coaxial.

[0110] To facilitate the connection between the second slider 2313 and the second lead screw 2312, a fifth threaded hole is opened on the second slider 2313, and the second lead screw 2312 is connected to the second slider 2313 through the fifth threaded hole. When the second lead screw 2312 rotates, it drives the second slider 2313 to slide along the slideway.

[0111] The first linear drive component 231 in this solution is not limited to the above structure, and can also be other structures that can drive the connecting rod 223 to move in a direction perpendicular to the connecting rod 11. The specific structure is not limited here and is selected by those skilled in the art according to actual needs.

[0112] In this solution, knobs are provided at the ends of the first lead screw 2322 and the second lead screw 2312, which is convenient for screwing the first lead screw 2322 and the second lead screw 2312 to rotate.

[0113] To prevent the rotating block 224 from slipping off the connecting rod 223, in this solution, second limit bolts 226 are provided at both ends of the connecting rod 223. The second limit bolts 226 are coaxially arranged with the connecting rod 223. The diameter of the bolt head of the second limit bolt 226 is larger than the diameter of the connecting rod 223, and the bolt head of the second limit bolt 226 limits the rotating block 224.

[0114] To facilitate the angle adjustment of the occipital bone screw 4, in this solution, a plurality of third mounting holes for cooperating with the occipital bone screw 4 are formed in the occipital bone plate 12, and the plurality of third mounting holes are arranged in sequence along the length direction of the occipital bone plate. During the operation, the doctor can determine in which third mounting hole the occipital bone screw 4 is to be installed according to the occipital bone condition of the patient, thereby improving the versatility of the occipital bone plate 12.

[0115] Preferably, the third mounting hole is an elongated mounting hole. When the occipital bone screw 4 is connected to the occipital bone, the position of the occipital bone screw 4 in the third mounting hole can be finely adjusted, further improving the versatility of the occipital bone plate 12 and reducing the matching difficulty between the occipital bone plate 12 and the occipital bone screw 4.

[0116] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A posterior reduction and internal fixation system, characterized in that: The invention comprises two vertebral body correction rods (1) and an adjustment device (2) arranged in parallel. The vertebral body correction rod (1) comprises a connecting rod (11) and an occipital plate (12). The connecting rod (11) can be connected to the pedicles on the same side of at least two vertebrae among the third to seventh vertebrae through the pedicle screws (3); The occipital plate (12) can be connected to the occipital bone via an occipital screw (4); the occipital plate (12) is arranged along the length extension direction of the connecting rod (11) and is connected to the connecting rod (11); the occipital plate (12) is arranged obliquely relative to the connecting rod (11); The adjusting device (2) is used to adjust the inclination angle of the occipital plate (12) relative to the connecting rod (11), and the adjusting device (2) comprises a base component (21), a connecting component (22) and a fine-tuning component (23). The base assembly (21) is connected to the connecting rod (11); The connecting assembly (22) comprises a first hook (221), a second hook (222) and a connecting rod (223). The connecting rod (223) is perpendicular to the connecting bar (11). The first hook (221) and the second hook (222) are parallel and perpendicular to the connecting rod (223); the bent hook ends of the first hook (221) and the second hook (222) are respectively connected to the two occipital screws (4); the fixed ends of the first hook (221) and the second hook (222) are connected to the connecting rod (223) via a rotating block (224); a first threaded hole is provided on the rotating block (224); a first locking bolt (225) for locking the rotating block (224) on the connecting rod (223) is provided in the first threaded hole; The fine adjustment component (23) comprises a first linear drive component (231) and a second linear drive component (232). The first linear drive assembly (231) is connected to the connecting rod (223) and is used to drive the connecting rod (223) to move in a direction perpendicular to the connecting rod (11) and to adjust the angle between the first retractor (221) and the second retractor (222) and the occipital screw (4). The second linear drive component (232) is connected to the first linear drive component (231) and is used to drive the first linear drive component (231) to move in a direction parallel to the connecting rod (11) so as to adjust the inclination angle between the occipital plate (12) and the connecting rod (11). The second linear drive component (232) is mounted on the base component (21).

2. The posterior reduction and internal fixation system according to claim 1, characterized in that: The base assembly (21) comprises a hook arm (211), a support rod (212), a sliding beam (213) and a first sliding block (214). The sliding beam (213) is perpendicular to the connecting rod (11). The number of the first sliding blocks (214) is two and they are slidably arranged at both ends of the length direction of the sliding beam (213); a second threaded hole is arranged on the first sliding block (214); a second locking bolt (215) is arranged in the second threaded hole; the first sliding block (214) is locked on the sliding beam (213) by the second locking bolt (215); a third threaded hole is opened on the first sliding block (214); a threaded section matching the third threaded hole is arranged at the first end of the length direction of the support rod (212); the support rod ( The first end of the support rod (212) is connected to the first slider (214) through the threaded section, the second end of the support rod (212) in the length direction can be abutted against the screw plug of the pedicle screw (3), and at least two hook arms (211) are arranged on each of the first sliders (214), the hook arms (211) are parallel to the support rod (212), the first end of the hook arm (211) in the length direction is connected to the first slider (214), and the second end of the hook arm (211) in the length direction is provided with a hook capable of lifting the connecting rod (11).

3. The posterior reduction and internal fixation system according to claim 2, characterized in that: A connecting block (216) is provided in the middle of the sliding beam (213), a sliding hole is provided on the connecting block (216), and the axial direction of the sliding hole is parallel to the driving direction of the second linear driving component (232); The second linear drive assembly (232) comprises a first fixed block (2321), a first lead screw (2322) and a guide rod (2323). There are two guide rods (2323), the first lead screw (2322) is located between the two guide rods (2323) and is parallel to the guide rods (2323), the first ends of the guide rods (2323) and the first lead screw (2322) in the axial direction pass through the sliding hole and are connected to the first linear drive assembly (231), the second ends of the guide rods (2323) and the first lead screw (2322) in the axial direction are connected to the first fixed block (2321), and the first fixed block (2321) is provided with a fourth threaded hole that cooperates with the first lead screw (2322).

4. The posterior reduction and internal fixation system according to claim 3, characterized in that: The second linear drive assembly (232) further comprises a second fixed block (2324) connected to the first linear drive assembly (231), and the second fixed block (2324) is provided with three first mounting holes respectively corresponding to the positions of the guide rod (2323) and the first lead screw (2322).

5. The posterior reduction and internal fixation system according to claim 4, characterized in that: The second fixed block (2324) is provided with a reinforcing plate (2325), the reinforcing plate (2325) being a right-angled triangular prism plate, and two right-angled surfaces of the reinforcing plate (2325) are respectively connected to the first linear drive component (231) and the second fixed block (2324).

6. The posterior reduction and internal fixation system according to claim 2, characterized in that: A first limiting bolt (217) is provided at the end of the sliding beam (213) for limiting the position of the first sliding block (214).

7. The posterior reduction and internal fixation system according to claim 5, characterized in that: The first linear drive assembly (231) comprises a third fixed block (2311) and a second lead screw (2312). A slideway perpendicular to the connecting rod (223) is provided in the third fixing block (2311), the connecting rod (223) is crossed in the slideway, a second mounting hole coaxially arranged with the slideway is provided on the third fixing block (2311), and a side wall of the third fixing block (2311) is connected to a right-angle surface of the reinforcing plate (2325); The first end of the second lead screw (2312) in the axial direction is inserted into the slideway through the second mounting hole and connected to the connecting rod (223); a fifth threaded hole is provided on the connecting rod (223) to cooperate with the second lead screw (2312); the second end of the second lead screw (2312) in the axial direction is located outside the slideway.

8. The posterior reduction and internal fixation system according to claim 7, characterized in that: The connecting rod (223) comprises a first connecting rod and a second connecting rod arranged coaxially, and two rotating blocks (224) are respectively provided on the first connecting rod and the second connecting rod. The first linear drive assembly (231) also includes a second slider (2313), which is located between the first connecting rod and the second connecting rod and is connected to the first connecting rod and the second connecting rod. The second slider (2313) is provided with the fifth threaded hole, and the second lead screw (2312) is connected to the second slider (2313) through the fifth threaded hole, so as to drive the second slider (2313) to slide along the slideway.

9. The posterior reduction and internal fixation system according to claim 1, characterized in that: Both ends of the connecting rod (223) are provided with second limiting bolts (226) for limiting the rotating block (224).

10. The posterior reduction and internal fixation system according to claim 1, characterized in that: The occipital plate (12) is provided with a plurality of third mounting holes that cooperate with the occipital screws (4), and the plurality of third mounting holes are arranged in sequence along the length direction of the occipital plate (12), and the third mounting holes are long strip-shaped mounting holes.

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