A posterior anatomical fixation plate device for axis pedicle fractures

Abstract

The present invention discloses a posterior anatomical fixation plate device for axis pedicle fractures. A fixing screw for the axis pedicle is inserted into the left pedicle of the axis through a first screw hole, and is fixed to the fixed point of the right pedicle of the axis by passing through a second screw hole via the fixing screw for the axis pedicle. The middle part of the left member of the fixing plate includes a head end fixing plate and a tail end fixing plate, which are arranged in a ring shape. A connection structure is formed by using the left member of the fixing plate and the right member of the fixing plate. One end of the left member of the fixing plate is a left screw fixing part, and the other end of the left member of the fixing plate is connected to one end of the right member of the fixing plate by a locking screw, which can anatomically align and fix the two fracture ends during axis pedicle fractures, achieving fracture reduction and fixation. The structure of the present invention is simple and the installation is reliable, solving the problems of easy loosening, tail swinging, and withdrawal of the posterior simple pedicle screw fixation for axis pedicle fractures, as well as postoperative neck axial pain, nerve injury, and cervical spondylosis.

Description

Technical Field

[0001] The invention belongs to the field of medical instruments, and in particular relates to a posterior anatomical fixation plate device for axis pedicle fractures. Background Art

[0002] Axis pedicle fracture, also known as Hangman fracture, was more common in patients with hanging in the past, so it is also called hanging fracture. It is a vertical or oblique fracture occurring in the isthmus of the axis vertebrae. It can cause separation of the axis vertebral body and lamina. Axis fracture can lead to damage to the anterior and posterior soft tissues, ligaments and C2 and 3 intervertebral discs, followed by instability of C2 and 3 vertebrae. The medulla oblongata is the center of life. The lumen formed by the posterior edge of the axis vertebral body and the posterior arch of the axis is also called the spinal canal. Improper treatment of axis pedicle fracture can cause medullary injury, leading to respiratory or cardiac arrest, resulting in serious consequences.

[0003] For stable axis pedicle fractures, treatment with hard braces or Halo frame external fixation can achieve a high fracture fusion rate, but there are problems such as long fixation time, impact on daily life, and traction pin hole is prone to infection; in addition, long-term fixation causes neck pain and cervical spondylosis, making the patient's neck similar to that of a goose, which is called "goose neck deformity."

[0004] For unstable axis pedicle fractures, the main methods used in the past were anterior C2 and C3 intervertebral joint bone grafting plus intervertebral plate screw fixation and posterior cervical fixation. Anterior C2 and C3 intervertebral discectomy and intervertebral fusion plate not only have the risk of vascular and nerve damage, but also sacrifice the flexion, extension and rotation activities between C2 and C3. There are two posterior fixation methods: one is simple axis pedicle screw fixation, and the other is axis and C3 vertebra fixation. At present, the simple axis pedicle screw fixation device has the following disadvantages: the traditional C2 pedicle screw has poor stability, and is prone to screw loosening, tail swinging, and falling off, resulting in fracture fixation failure; in addition, the screw tail cap has a high notch, and the tail cap has long-term stimulation to the soft tissue after surgery, and the damage to the insertion point of the cervical semispinalis muscle during surgery causes neck pain, which is easy to cause "swan neck deformity" and cervical spondylosis. Fusion fixation of the axis and C3 vertebrae increases the fixation of C3 vertebrae. Although the stability of posterior fusion fixation is increased by fusing the C2 and C3 facet joints, it will also lead to the disappearance of the movement function of C2 and C3 vertebrae, increase the risk of cervical degeneration, and easily lead to axial symptoms of neck muscle pain and discomfort, and induce the occurrence of cervical spondylosis and goose neck deformity. Moreover, the use of pedicle screw fixation in the posterior approach is difficult to operate and has high risks.

[0005] In order to solve the problems of loosening, tail swinging and dislocation of pedicle fixation screws alone, posterior fusion of cervical 2 and 3 will sacrifice the intervertebral mobility, and the difficulty and risk of axis pedicle screw placement, axial pain is prone to occur after posterior surgery, and the incidence of cervical spondylosis is increased. Therefore, a reliable fixation device is urgently needed. Summary of the invention

[0006] The object of the present invention is to provide a posterior anatomical fixing plate device for axis pedicle fractures to overcome the deficiencies of the prior art. This device can be used for anatomical alignment and fixation of the two fracture ends during axis pedicle fractures, achieving fracture reduction and fixation.

[0007] A posterior anatomical fixing plate device for axis pedicle fractures includes a left fixing plate member and a right fixing plate member. One end of the left fixing plate member is a left screw fixing part. The other end of the left fixing plate member is connected to one end of the right fixing plate member by a locking screw. A first screw hole is provided on the left screw fixing part of the left fixing plate member and is fixed to the left axis pedicle fixation point through an axis pedicle fixing screw. The other end of the right fixing plate member is a right screw fixing part. A second screw hole is provided on the right screw fixing part and is fixed to the right axis pedicle fixation point through an axis pedicle fixing screw passing through the second screw hole. The middle part of the left fixing plate member includes a head end fixing plate and a tail end fixing plate. The head end fixing plate and the tail end fixing plate are arranged in a ring shape, and an anatomical channel is formed between the head end fixing plate and the tail end fixing plate.

[0008] Furthermore, a third screw hole for passing an axis spinous process screw is respectively provided on both sides of the head end fixing plate on the left fixing plate member, and an axis spinous process screw is implanted on both sides of the axis spinous process through the third screw hole.

[0009] Furthermore, the third screw hole is a threaded hole. The axis spinous process screw is threadedly connected to the third screw hole. The axis spinous process screw includes a screw body. One end of the screw body is provided with a front self-tapping screw head. The other end of the screw body is provided with a threaded connection end. The diameter of the threaded connection end is larger than the diameter of the screw body, and the other end of the screw body is threadedly connected to the third screw hole.

[0010] Furthermore, a bolt groove is provided at the connection end of the other end of the left fixing plate member and the right fixing plate member. The locking screw can slide in the bolt groove. A bolt hole is provided at one end of the right fixing plate member. The locking screw passes through the bolt hole of the right fixing plate member and the bolt groove of the left fixing plate member, and the other end of the locking screw is locked by a locking nut.

[0011] Furthermore, both the first screw hole on the left fixing plate member and the second screw hole on the right screw fixing part are tapered holes, and the side wall of the axis pedicle fixing screw contacts the side wall when fixed to the first screw hole or the second screw hole.

[0012] Furthermore, the axis pedicle fixing screw includes a fixing screw body. One end of the fixing screw body is provided with a self-tapping screw head. The outer surface of the fixing screw body at the end with the self-tapping screw head is provided with a fixed vertebral body partial thread. The outer side of the end of the fixing screw body far from the self-tapping screw head is provided with a tapered screw tail matching the first screw hole or the second screw hole.

[0013] Further, locking spring piece devices are provided on the outer sides of the first screw holes on the left member of the fixing plate and the outer sides of the second screw holes on the right member of the fixing plate.

[0014] Further, the locking spring piece device adopts double-sided locking spring pieces.

[0015] Further, the locking spring piece device includes an automatic spring piece installation groove, a spring, and an elastic semi-circular locking spring piece. The automatic spring piece installation grooves are symmetrically formed on both sides of the first screw hole or the second screw hole. The elastic semi-circular locking spring pieces are fixed in the automatic spring piece installation grooves through the springs, and symmetrically arranged elastic semi-circular locking spring pieces are formed on both sides of the first screw hole or the second screw hole.

[0016] Further, the left member of the fixing plate is of an arcuate structure, and both the left member of the fixing plate and the right member of the fixing plate adopt a titanium alloy fixing plate structure.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects:

[0018] The posterior anatomical fixing plate device for axis pedicle fractures of the present invention implants a fixing screw for the axis pedicle through the first screw hole into the left pedicle of the axis, and fixes it to the fixing point of the right pedicle of the axis through the fixing screw for the axis pedicle passing through the second screw hole; the middle part of the left member of the fixing plate includes a head end fixing plate and a tail end fixing plate, the head end fixing plate and the tail end fixing plate are arranged in a ring shape, and an anatomical channel is formed between the head end fixing plate and the tail end fixing plate. A connection structure is formed by using the left member of the fixing plate and the right member of the fixing plate. One end of the left member of the fixing plate is a left screw fixing part, and the other end of the left member of the fixing plate is connected to one end of the right member of the fixing plate through a locking screw, which can achieve anatomical alignment fixation of the two fracture ends during axis pedicle fractures, realize fracture reduction and fixation, with a simple structure and reliable installation, and solve the problems of easy loosening, tail swinging, and withdrawal of the posterior simple pedicle screw fixation for axis pedicle fractures, as well as postoperative neck axial pain, nerve injury, and cervical spondylosis.

[0019] Further, by implanting a fixing screw for the axis spinous process on both sides of the axis spinous process through the third screw hole, further positioning is achieved, so that the entire fixing device forms an organic whole with the fractured vertebral body and forms a stable connection structure.

[0020] Further, the tail of the fixing screw for the axis spinous process is threadedly connected to the third screw hole to achieve the installation stability of the fixing screw for the axis spinous process.

[0021] Further, for contact positioning, a locking screw is used for locking, which is not easy to slide and improves the connection stability.

[0022] Further, when the side wall of the axis pedicle fixation screw contacts the side wall during fixation with the first screw hole or the second screw hole, while maintaining the stability of the fracture ends, the tapered hole inner edge matching structure can disperse the stress at the screw tail, reduce the probability of screw loosening, and at the same time avoid the fixation screw from entering the bone cortex too deeply.

[0023] Further, locking spring plate devices are provided on the outer side of the first screw hole on the left member of the fixing plate and on the outer side of the second screw hole on the right member of the fixing plate.

[0024] Further, the locking spring plate device adopts a bilateral locking spring plate.

[0025] Further, it is connected through a telescopic structure, which is applicable to different-sized axis vertebrae, increases the adjustability of the titanium plate and the adaptability to the posterior structure of the axis vertebra, and the anatomical locking screw meets the fitting of the connection part and the bone surface of the axis vertebral lamina, increasing the overall stability of the titanium plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is the front view of the structure of the fixing plate device in the embodiment of the present invention.

[0027] Figure 2 This is the top view of the structure of the fixing plate device in the embodiment of the present invention.

[0028] Figure 3 This is the schematic structural diagram of the axis pedicle fixation screw in the embodiment of the present invention.

[0029] Figure 4 This is the schematic structural diagram of the axis spinous process screw in the embodiment of the present invention.

[0030] Figure 5 This is the schematic structural diagram of the locking spring plate device in the embodiment of the present invention.

[0031] Figure 6 This is the schematic structural diagram of the connection structure between the left member and the right member of the fixing plate in the embodiment of the present invention.

[0032] In the figure, 1. Left member of the fixing plate; 2. Right member of the fixing plate; 3. First screw hole; 5. Connection part of the left member; 6. Right screw fixing part; 7. Locking screw; 8. Locking nut; 9. Head end fixing plate; 10. Tail end fixing plate; 11. Anatomical channel; 12. Locking spring plate device; 13. Gradually changing inner edge; 14. Threaded hole; 15. Axis pedicle fixation screw; 16. Self-tapping screw head; 17. Fixed vertebral body partial thread; 18. Gradually changing screw tail; 19. Disassembly threaded opening; 20. Axis spinous process screw; 21. Front end self-tapping screw head; 22. Threaded connection end; 23. Second screw hole; 24. Third screw hole; 121. Automatic spring plate installation groove; 122. Spring; 123. Elastic semi-circular locking spring plate. DETAILED DESCRIPTION OF THE INVENTION

[0033] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0035] Such as Figures 1 to 6As shown in the figure, a posterior anatomical fixation plate device for axis pedicle fractures includes a left fixing plate member 1 and a right fixing plate member 2. One end of the left fixing plate member 1 is a left screw fixing part. The other end of the left fixing plate member 1 is connected to one end of the right fixing plate member 2 by a locking screw 7. A first screw hole 3 is provided on the left screw fixing part of the left fixing plate member 1 and is fixed to the left pedicle fixation point of the axis through an axis pedicle fixing screw 15. The other end of the right fixing plate member 2 is a right screw fixing part. A second screw hole 23 is provided on the right screw fixing part 6 and is fixed to the right pedicle fixation point of the axis through the axis pedicle fixing screw 15 passing through the second screw hole 23. The middle part of the left fixing plate member 1 includes a head end fixing plate 9 and a tail end fixing plate 10. The head end fixing plate 9 and the tail end fixing plate 10 are arranged in a ring shape, and an anatomical channel 11 is formed between the head end fixing plate 9 and the tail end fixing plate 10. Determine the left needle insertion point of the axis pedicle fixing screw 15, select the left fixing plate member 1 and the right fixing plate member 2 of appropriate sizes, insert an axis pedicle fixing screw 15 into the left pedicle of the axis through the first screw hole 3, partially loosen the locking nut 8 at the connection of the left fixing plate member 1 and the right fixing plate member 2, and loosen the locking screw 7 to the right screw fixing part 6 at the needle insertion point of the right axis pedicle fixing screw. Insert a second axis pedicle fixing screw 15 into the right pedicle of the axis through the second screw hole 23 on the right fixing plate member 2, and tighten the bilateral axis pedicle fixing screws 15 until the self-locking elastic piece 12 pops out to lock the axis pedicle fixing screw 15. Insert an axis spinous process screw 20 on each side of the axis spinous process through the two third screw holes 24 on the left fixing plate member 1 and lock it with the third screw hole 24. Finally, tighten the locking nut 8 to fix the connection 5 between the left member and the right screw fixing part 6, so that the entire fixing device forms an organic whole with the fractured vertebral body.

[0036] The left fixing plate member 1 is in an arcuate structure. Both the left fixing plate member 1 and the right fixing plate member 2 adopt a titanium alloy fixing plate structure. A third screw hole 24 for passing the axis spinous process screw is respectively provided on both sides of the head end fixing plate 9 on the left fixing plate member 1. An axis spinous process screw 20 is implanted on each side of the axis spinous process through the third screw hole 24 to achieve further positioning, so that the entire fixing device forms an organic whole with the fractured vertebral body and forms a stable connection structure.

[0037] As Figure 4As shown, in order to improve the positioning stability of the axis spinous process screw 20, the third screw hole 24 is a threaded hole 14. The axis spinous process screw 20 is threadedly connected to the third screw hole 24. The axis spinous process screw 20 includes a screw body. One end of the screw body is provided with a front self-tapping screw head 21, and the other end of the screw body is provided with a threaded connection end 22. The diameter of the threaded connection end 22 is greater than the diameter of the screw body. The other end of the screw body is threadedly connected to the third screw hole 24. During use, the left fixing plate member 1 is adjusted to the corresponding position so that the third screw hole 24 is correspondingly located on one side of the axis spinous process. Then, the axis spinous process screw 20 is implanted and fixed. The end of the axis spinous process screw 20 serves the purpose of self-tapping, and the tail of the axis spinous process screw 20 is threadedly connected to the third screw hole 24 to achieve the installation stability of the axis spinous process screw 20.

[0038] The connection end of the other end of the left fixing plate member 1 and the right fixing plate member 2 is provided with a bolt groove. The locking screw 7 can slide in the bolt groove. One end of the right fixing plate member 2 is provided with a bolt hole. The locking screw 7 passes through the bolt hole of the right fixing plate member 2 and the bolt groove of the left fixing plate member 1. The other end of the locking screw 7 is locked by a locking nut 8. The locking screw 7 can slide in the bolt groove of the left fixing plate member 1, thereby adjusting the fixed connection position of the left fixing plate member 1 and the right fixing plate member 2, realizing the position adjustment and fixation of the left fixing plate member 1 and the right fixing plate member 2 to adapt to the different sizes of different individuals; the lower end of the other end of the left fixing plate member 1 is provided with a plane for contacting the plane at one end of the right fixing plate member 2 for contact positioning. Locked by the locking screw 7, it is not easy to slide, improving the connection stability.

[0039] When the left fixing plate member 1 and the right fixing plate member 2 are fixed, a curved structure is formed, which matches the fitting surfaces of the lateral mass and the spinous process of the anatomical morphology design behind the axis, increasing the fitting of the anatomical fixing plate to the lateral mass and spinous process of the axis, increasing the adaptability of the fixing plate to the special structure behind the spine, and the stability of the internal fixation system.

[0040] Both the first screw hole 3 on the left fixing plate member 1 and the second screw hole 23 on the right screw fixing part are tapered holes. When the side wall of the axis pedicle fixation screw 15 is fixed to the side wall of the first screw hole 3 or the second screw hole 23, while maintaining the stability of the fracture end, the inner edge matching structure of the tapered hole can disperse the stress at the screw tail, reduce the probability of screw loosening, and at the same time avoid the fixing screw from entering the bone cortex too deeply.

[0041] As Figure 3As shown, the axis pedicle fixation screw 15 includes a fixation screw body. One end of the fixation screw body is provided with a self-tapping screw head 16. The outer surface of the fixation screw body at the end of the self-tapping screw head 16 is provided with a fixation vertebral body part thread 17. The outer side of the end of the fixation screw body far from the self-tapping screw head 16 is provided with a tapered screw tail 18 that matches the first screw hole 3 or the second screw hole 23. The end of the tapered screw tail 18 is provided with a disassembly thread port 19.

[0042] Both the left screw fixation part and the right screw fixation part are provided with bending parts, which are designed as special angles with gradient changes. The best screw placement path is designed according to the CT reconstruction images of the fracture site, and a fixing plate with a screw hole direction that best matches the screw track is selected. The placement direction of the fixation screw is guided through the angle screw hole, avoiding damage to blood vessels and nerves while accurately implanting the pedicle fixation screw.

[0043] On the outside of the first screw hole 3 on the left fixing plate member 1 and on the outside of the second screw hole 23 on the right fixing plate member 2, a locking elastic sheet device 12 is provided for locking and fixing the axis pedicle fixation screw 15 placed in the first screw hole 3 and the second screw hole 23.

[0044] As Figure 5 shown, the locking elastic sheet device 12 adopts bilateral locking elastic sheets, which can prevent the axis pedicle fixation screw from loosening, withdrawing and tail swinging. The locking elastic sheet device 12 includes an automatic elastic sheet installation groove 121, a spring 122 and an elastic semi-circular locking elastic sheet 123. The automatic elastic sheet installation groove 121 is symmetrically opened on both sides of the first screw hole 3 or the second screw hole 23. The elastic semi-circular locking elastic sheet 123 is fixed in the automatic elastic sheet installation groove 121 through the spring 122, forming symmetrically packaged elastic semi-circular locking elastic sheets 123 on both sides of the first screw hole 3 or the second screw hole 23. When the axis pedicle fixation screw 15 is tightened, the tapered screw tail 18 squeezes the locking elastic sheet, and the elastic semi-circular locking elastic sheet 123 retracts inward. When the tapered screw tail 18 completely passes through the locking elastic sheet installation operation 121, the spring 122 of the control locking sheet automatically rebounds to realize the locking of the pedicle fixation screw 15 by the semi-circular locking sheet 123.

[0045] The left fixing plate member 1 is provided with a first screw hole 3 for the axis spinous process screw to pass through. The fixing plate is further strengthened and fixed by the spinous process screw, increasing the stability between the fixing plate and the axis fixation screw. Further, the stability of the axis fixation screw is increased by the locking elastic sheet, reducing the loosening, tail swinging and withdrawal of the axis pedicle fixation screw.

[0046] The axis spinous process screw and the corresponding screw hole are in a threaded locking structure, avoiding the angular movement between the tail of the axis spinous process screw and the fixing plate, increasing the stability between the spinous process screw and the fixing plate, and further enhancing the overall stability of the internal fixation system and the stability of the axis pedicle fixation screw.

[0047] The fixing plate left component 1 is provided with an anatomical channel 11 for the spinous process of the axis to pass through. The anatomical channel 11 allows the spinous process of C2 to pass through, preserving the integrity of the C2 spinous process during the operation, providing an attachment point for reconstructing the insertion point of the semispinalis cervicis muscle behind the axis after the operation, increasing the stability of the muscle and ligament system behind the axis, reducing the occurrence of postoperative pain and swan-neck deformity, and thus reducing the incidence of cervical spondylosis.

[0048] During implementation, the fixing plate left component 1 and the fixing plate right component 2 are connected by a telescopic structure. The pedicle screw 15 of the axis is an anatomical locking screw, and the telescopic connection structure is fixed by the anatomical locking screw, which is applicable to axes of different sizes, increasing the adjustability of the titanium plate and the adaptability to the posterior structure of the axis. The anatomical locking screw satisfies the fitting of the connection part to the bone surface of the lamina of the axis, increasing the overall stability of the titanium plate.

[0049] During use, as Figure 6 shown, determine the left entry point of the pedicle screw 15 of the axis, select the fixing plate left component 1 and the fixing plate right component 2 of appropriate sizes, insert a pedicle screw 15 of the axis into the left pedicle of the axis through the first screw hole 3, partially loosen the locking nut 8 at the connection of the fixing plate left component 1 and the fixing plate right component 2, and loosen the locking screw 7 to the right screw fixing part 6 at the entry point of the pedicle screw of the right axis. Insert a second pedicle screw 15 of the axis into the right pedicle of the axis through the second screw hole 23 on the fixing plate right component 2, and tighten the bilateral pedicle screws 15 of the axis until the self-locking spring piece 12 pops out to lock the pedicle screw 15 of the axis. Insert a pedicle spinous process screw 20 on each side of the spinous process of the axis through the two third screw holes 24 on the fixing plate left component 1 and lock it with the third screw hole 24. Finally, tighten the locking nut 8 to fix the connection 5 of the left component and the right screw fixing part 6, making the whole fixing device form an organic whole with the fractured vertebral body.

[0050] In specific implementation, the tapered tail 18 of the pedicle screw 15 of the axis fixes the fixing plate left component 1 and the fixing plate right component 2 to the posterior of the vertebral column of the axis through the tapered inner edge 13 in the first screw hole 3 or the second screw hole 23, realizing anatomical alignment of the fracture ends, tensioning and compression fixation, and the tapered inner edge 13 disperses the stress of the screw tail and prevents the screw from entering too deeply.

[0051] In specific implementation, in order to adapt to the anatomical morphological shape of the lateral mass, lamina and pedicle of the axis, the first screw hole 3 adopts a gradient-changing angle, that is, a tapered hole structure, with a transverse internal inclination angle of 28°, 30°, 32°, 34° or 36°, with an increment gradient of 2° each, and a sagittal cephalad inclination of 24°, 28°, 30° or 32°, with an increment gradient of 2° each, so as to match different patients, different pedicle shapes and included angles.

[0052] In the specific implementation manner, for the locking spring plate device 12 outside the first screw hole 3 and the second screw hole 23, after the fixing atlantoaxial pedicle screw 15 tightens to fix the left fixing plate member 1 and the right fixing plate member 2 to the atlantoaxial lateral mass bone surface, the locking spring plate device 12 can pop out to cover part of the screw tail of the fixing atlantoaxial pedicle screw 15. The working mechanism of the locking spring plate device 12 is as follows: when the atlantoaxial pedicle screw 15 is tightened, the tapered screw tail 18 squeezes the locking spring plate, and the elastic semi-circular locking spring plate 123 retracts inward. When the tapered screw tail 18 completely passes through the locking spring plate installation operation part 121, the spring 122 controlling the locking plate automatically rebounds to lock the atlantoaxial pedicle screw 15 with the semi-circular locking plate 123.

[0053] In the specific implementation, the third screw hole 24 for passing the atlantoaxial spinous process screw 20 is provided on the left fixing plate member 1. The atlantoaxial spinous process screw 20 further fixes the left fixing plate member 1 and the right fixing plate member 2 to the atlantoaxial spinous process, increasing the fitting and stability of the fixing plate with the atlas, and the atlantoaxial spinous process screw 20 and the third screw hole 24 are provided with mutually engaging threads to avoid angular movement between the screw and the fixing plate.

[0054] In the implementation manner, the chord length of the head end fixing plate 9 is 14 - 16 mm, the arc radius is 7 - 13 mm, preferably 10 mm, and the width is 3 mm; the chord length of the tail end fixing plate 10 is 18 - 22 mm, the arc radius is 13 - 18 mm, preferably 15 mm, and the width is 2 mm.

[0055] In the specific implementation manner, the left fixing plate member 1 and the right fixing plate member 2 can be slidably connected. The left member connection part 5 on the left fixing plate member 1 and the right screw fixing part 6 on the right fixing plate member 2 are connected by a locking screw to increase the adaptability of the fixing plate. The tail end of the locking screw 7 and the connection part of the right fixing plate member 2 are in an interference fit relationship, ensuring the anatomical fit of the connection part with the atlantoaxial lamina bone surface.

[0056] In the specific implementation manner, the diameter of the atlantoaxial pedicle screw 15 is 35 mm - 40 mm; the length of the atlantoaxial pedicle screw 15 is 26 mm - 30 mm, preferably 28 mm, and the thread length at the head end of the atlantoaxial pedicle screw 15 is 10 mm, and the thread depth is 2 mm.

[0057] In the specific implementation manner, the diameter of the atlantoaxial spinous process screw 20 is 28 - 32 mm, and the length is 4.0 mm - 8.0 mm, preferably 6 mm.

[0058] The width of the lateral mass fitting surface of the left fixing plate member 1 and the right fixing plate member 2 is 10 mm - 14 mm, and the length is 12 mm - 16 mm; the width of the spinous process fitting surface is 9 - 11 mm, and the length is 16 mm - 20 mm.

[0059] In the specific embodiment, as Figure 1 shown, the side block fitting surface and the spinous process fitting surface of the left member 1 of the fixing plate and the right member 2 of the fixing plate form a special angle α. Among them, the cephalic angle α1 is 165° - 175°, increasing in increments of 5° for each gradient, and the caudal angle α2 is 155° - 165°, increasing in increments of 5° for each gradient, so as to anatomically fit the fixing plate with the lateral mass surface and the vertebral plate surface of the axis.

[0060] In the above specific embodiments, the purpose, technical solutions and beneficial effects of the present invention have been further described in detail. It should be understood that the above are only specific embodiments of the present invention and are not limited to the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A posterior anatomical fixation plate device for axis pedicle fractures, characterized in that, It includes a left fixing plate member (1) and a right fixing plate member (2). One end of the left fixing plate member (1) is a left screw fixing part. The other end of the left fixing plate member (1) is connected to one end of the right fixing plate member (2) by a locking screw (7). A first screw hole (3) is provided on the left screw fixing part of the left fixing plate member (1), and it is fixed to the left pedicle fixation point of the axis through an axis pedicle fixation screw (15). The other end of the right fixing plate member (2) is a right screw fixing part. A second screw hole (23) is provided on the right screw fixing part (6), and the axis pedicle fixation screw (15) passes through the second screw hole (23) and is fixed to the right pedicle fixation point of the axis. The middle part of the left fixing plate member (1) includes a head end fixing plate (9) and a tail end fixing plate (10). The head end fixing plate (9) and the tail end fixing plate (10) are arranged in a ring shape, and an anatomical channel (11) is formed between the head end fixing plate (9) and the tail end fixing plate (10). On both sides of the head end fixing plate (9) on the left fixing plate member (1), there is respectively a third screw hole (24) for the axis spinous process screw to pass through. Through the third screw hole (24), an axis spinous process screw (20) is implanted on both sides of the axis spinous process. The connection end of the other end of the left fixing plate member (1) and the right fixing plate member (2) is provided with a bolt groove. The locking screw (7) can slide in the bolt groove. One end of the right fixing plate member (2) is provided with a bolt hole. The locking screw (7) passes through the bolt hole of the right fixing plate member (2) and the bolt groove of the left fixing plate member (1), and the other end of the locking screw (7) is locked by a locking nut (8).

2. The posterior anatomical fixation plate device for axis pedicle fracture according to claim 1, characterized in that, The third screw hole (24) is a threaded hole. The axis spinous process screw (20) is threadedly connected to the third screw hole (24). The axis spinous process screw (20) includes a screw body. One end of the screw body is provided with a front self-tapping screw head (21). The other end of the screw body is provided with a threaded connection end (22). The diameter of the threaded connection end (22) is larger than the diameter of the screw body. The other end of the screw body is threadedly connected to the third screw hole (24).

3. The posterior anatomical fixation plate device for axis pedicle fractures according to claim 1, wherein, Both the first screw hole (3) on the left fixing plate member (1) and the second screw hole (23) on the right screw fixing part are tapered holes. When the side wall of the axis pedicle fixation screw (15) is fixed, it contacts the side wall of the first screw hole (3) or the second screw hole (23).

4. The posterior anatomical fixation plate device for axis pedicle fracture according to claim 3, wherein, The axis pedicle fixation screw (15) includes a fixing screw body. One end of the fixing screw body is provided with a self-tapping screw head (16). The outer surface of the fixing screw body at the end with the self-tapping screw head (16) is provided with a fixed vertebral body partial thread (17). The outer side of the end of the fixing screw body far from the self-tapping screw head (16) is provided with a tapered nail tail (18) matching the first screw hole (3) or the second screw hole (23).

5. The posterior anatomical fixing plate device for axis pedicle fracture according to claim 1, wherein, On the outer side of the first screw hole (3) on the left fixing plate member (1) and on the outer side of the second screw hole (23) on the right fixing plate member (2), a locking elastic piece device (12) is provided.

6. The posterior anatomical fixing plate device for axis pedicle fracture according to claim 5, characterized in that, The locking elastic piece device (12) adopts bilateral locking elastic pieces.

7. The posterior anatomical fixing plate device for axis pedicle fracture according to claim 6, characterized in that, The locking shrapnel device (12) includes an automatic shrapnel mounting groove (121), a spring (122), and an elastic semi-circular locking shrapnel (123). The automatic shrapnel mounting groove (121) is symmetrically formed on both sides of the first screw hole (3) or the second screw hole (23). The elastic semi-circular locking shrapnel (123) is fixed in the automatic shrapnel mounting groove (121) through the spring (122), and elastic semi-circular locking shrapnels (123) symmetrically arranged in packages are formed on both sides of the first screw hole (3) or the second screw hole (23).

8. The posterior anatomical fixation plate device for axis pedicle fracture according to claim 1, wherein, The left fixing plate member (1) is in an arcuate structure, and both the left fixing plate member (1) and the right fixing plate member (2) adopt a titanium alloy fixing plate structure.

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