Spinal plate reduction fixation system and method of operation thereof

Abstract

The application discloses a vertebral plate reduction fixing system and an operation method thereof, and particularly relates to the technical field of medical instruments, which comprises a vertebral plate reduction fixing plate, a vertebral plate reduction fixing screw and a mounting instrument for grabbing the vertebral plate reduction fixing screw; the vertebral plate reduction fixing plate is provided with at least three first mounting holes and at least two second mounting holes, the vertebral plate reduction fixing screw is mounted in the first mounting hole and the second mounting hole, adjusting sliding grooves for the sliding of the vertebral plate reduction fixing screw are arranged between the at least three first mounting holes, and the head of the vertebral plate reduction fixing screw is provided with a double nut mechanism. The vertebral plate reduction fixing plate, the vertebral plate reduction fixing screw and the mounting instrument are arranged, the vertebral plate reduction fixing system in the intraspinal tumor resection is improved, especially for the intraspinal tumor of multiple segments, the vertebral plate and the spine are fixed in the vertebral plate spinous process complex reduction operation after the tumor resection, and anatomic reduction is achieved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to a spinal plate repositioning and fixation system and its operation method. Background Technology

[0002] Spinal canal tumors account for approximately 20% of all neurological tumors, and are mostly benign. Posterior laminectomy to expose the spinal canal is the traditional surgical treatment for spinal canal tumors. Its advantages include a wide surgical field, facilitating thorough exposure and removal of the tumor while better preserving neurological function. However, this surgery excessively damages the posterior spinal structures, reducing spinal biomechanical stability and potentially leading to spinal deformities in the long term. Furthermore, prolonged postoperative scar adhesions can cause iatrogenic spinal stenosis, resulting in neurological symptoms. Therefore, to avoid these drawbacks, the currently commonly used surgical method is laminectomy. Its advantages include effectively preventing postoperative scar adhesions from compressing the spinal cord and, to some extent, restoring the integrity of the spinal canal, thus helping to maintain spinal stability.

[0003] Currently, there are various fixation techniques for laminectomy after laminectomy in clinical practice. Fixation methods include: ligation with silk or steel wire, miniature plates, screws, etc. Some clinical laminectomy systems use skull connecting plates, while others use modified connecting plates for laminectomy fixation, such as the laminectomy fixation system with patent application publication number CN 115252092 A. This system uses connecting plates to combine multiple parts and fix them into adjacent transverse processes, vertebral bodies, and laminectomies to fix the corresponding areas.

[0004] However, in practical use, if the commonly used cranial connecting plate is adopted, the connecting plate is thin, weak, and cannot be adjusted in length because it was originally designed for craniocerebral surgery for cranial repositioning and fixation. In addition, the screws are prone to loosening and displacement, are suitable for fixation of the concave and convex parts of the spine but not for fixation of the concave and convex parts of the spine, and can easily damage the spinal cord and nerves when screws are twisted into the instrument. If the publicly available laminar fixation system is used, the connecting plate fixation technique is complex and difficult to operate, causes great damage to soft tissues, affects spinal mobility after fixation of the transverse process, affects laminar healing, and may even lead to displacement and dislodgement of the repositioning plate. Therefore, this invention proposes a spinal laminar repositioning and fixation system and its operation method as a further improvement. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, embodiments of the present invention provide a spinal plate repositioning and fixation system and its operation method to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a spinal plate repositioning and fixation system, the system comprising: a spinal plate repositioning and fixation plate, spinal plate repositioning and fixation screws, and an installation device for grasping the spinal plate repositioning and fixation screws; The spinal plate repositioning and fixing plate includes a main fixing plate and a secondary fixing plate. One end of the main fixing plate is fixedly connected to at least two secondary fixing plates as a single unit. At least three first mounting holes are provided at the central axis of the main fixing plate. A second mounting hole is provided at the end of the secondary fixing plate away from the main fixing plate. The spinal plate repositioning and fixing screw is installed in the first mounting hole and the second mounting hole. An adjusting groove for sliding the spinal plate repositioning and fixing screw is provided between the at least three first mounting holes. The head of the spinal plate repositioning and fixing screw is provided with a double nut mechanism.

[0007] Furthermore, the double-nut mechanism includes: a lower nut connecting the body of the spinal plate repositioning and fixing screw and an upper nut connecting the lower nut. Both the lower nut and the upper nut are configured as frustum shapes, and the maximum diameter of the upper nut is smaller than the maximum diameter of the lower nut.

[0008] Furthermore, both the first and second mounting holes are divided into a cylindrical placement groove and a frustum threaded groove along the installation direction of the spinal plate repositioning and fixing screw. The spinal plate repositioning and fixing screw is threadedly connected to the frustum threaded groove. The maximum diameter of the lower nut is greater than the maximum diameter of the frustum threaded groove, and the maximum diameter of the lower nut is less than the diameter of the cylindrical placement groove. The lower nut is engaged with the cylindrical placement groove.

[0009] Furthermore, the spinal plate repositioning and fixing plate is configured to be Y-shaped.

[0010] Furthermore, the width of the adjusting groove is equal to the minimum diameter of the frustum threaded groove, and the width of the adjusting groove is less than the maximum diameter of the lower nut.

[0011] Furthermore, the installation device includes a screwdriver and a fixed sleeve. The fixed sleeve is movably sleeved on the handle end of the screwdriver. The handle end of the screwdriver is fixedly connected to the inner wall of the fixed sleeve end via a return spring. A left caliper and a right caliper distributed on both sides of the screwdriver are fixedly connected to the end of the fixed sleeve away from the return spring. The left caliper and the right caliper are both engaged with the upper nut at the end away from the fixed sleeve.

[0012] Furthermore, the main fixing plate has a transverse groove on the side near the spine plate that communicates with the adjustment slide.

[0013] A method for operating a spinal plate repositioning and fixation system, comprising a spinal plate repositioning and fixation system, the specific operation method of which is as follows: Step 1: Using the installation instrument for grasping the spinal plate reduction and fixation screw, install a spinal plate reduction and fixation screw into the first mounting hole of the main fixation plate in the spinal plate reduction and fixation plate, and connect the removed spinous process bone of the vertebral plate to the main fixation plate; at this time, the spinal plate reduction and fixation screw is not locked with the first mounting hole. Step 2: Using the instrument for grasping the spinal plate reduction and fixation screws, install the two spinal plate reduction and fixation screws into the second mounting holes of the two auxiliary fixation plates in the spinal plate reduction and fixation plate, and connect the vertebral lamina or inferior articular process bone to the corresponding auxiliary fixation plate; at this time, the spinal plate reduction and fixation screws are locked with the second mounting holes. Step 3: Adjust the spinous process bone of the removed vertebral lamina and the residual bone of the lamina or inferior articular process according to the size of the gap between the ends. If necessary, slide the spinous process bone repositioning screw into the first mounting hole that meets the requirements through the adjustment groove. Finally, lock the spinous process bone repositioning screw into the suitable first mounting hole. Step 4: Based on the stability of the repositioned spinous process bone, continue to install the spinous process fixation screws in the remaining first mounting holes to connect the spinous process bone to the main fixation plate. Step 5: Suture the removed lamina spinous process and supraspinous ligament to the normal supraspinous ligament remnant. Suture the muscle and soft tissue next to the lamina spinous process bone into the transverse foramen, close the residual cavity next to the lamina spinous process bone, and tightly suture the muscle fascia next to the spinous process bone to the supraspinous ligament to reposition and fix the lamina spinous process bone.

[0014] Furthermore, in steps one to four, if the installation instrument clamps the spinal plate repositioning and fixing screw, first pull the screwdriver of the installation instrument to compress the repositioning spring, then place the upper nut of the spinal plate repositioning and fixing screw between the left and right calipers, so that the left and right calipers are engaged with the upper nut, then release the screwdriver to push against the spinal plate repositioning and fixing screw, so that the spinal plate repositioning and fixing screw is clamped between the left caliper, the right caliper and the screwdriver; If the spinal plate repositioning fixation screws are removed, the repositioning spring is compressed by pulling the screwdriver of the installation instrument. If the spinal plate repositioning and fixing screw is rotated, the screwdriver tip shape is the same as the groove shape opened on the upper nut end face of the spinal plate repositioning and fixing screw. Rotating the screwdriver or fixing sleeve drives the installation instrument to rotate.

[0015] Furthermore, in steps one through five, it is necessary to prevent the screws from coming loose or the installation device from shifting and slipping into the spinal canal, thereby damaging the spinal cord nerves, during the installation of the spinal plate repositioning and fixing screws.

[0016] The technical effects and advantages of this invention are as follows: 1. Compared with existing technologies, this invention improves the spinal lamina reduction and fixation system during spinal canal tumor resection by setting up a spinal lamina reduction and fixation plate, spinal lamina reduction and fixation screws, and installation instruments. Especially for multi-segment spinal canal tumors, it fixes the lamina and vertebrae during the lamina-spinous process complex reduction after tumor resection, achieving anatomical reduction. The spinal lamina reduction and fixation plate and spinal lamina reduction and fixation screws are made of titanium alloy, which makes the device easy to shape, takes into account the strength of the metal, does not affect magnetic resonance imaging, and the low price of raw materials reduces costs.

[0017] 2. Compared with existing technologies, by setting multiple first mounting holes and adjustment grooves in the spinous process fixation plate, doctors can adjust the size of the gap between the removed spinous process bone and the residual bone of the lamina or inferior articular process, eliminating the need to remove the spinous process fixation screws and repeat the installation and removal operation. This avoids bone damage caused by repeated screw installation and removal, making the operation simpler and more convenient, saving surgical time, and improving the drawbacks of existing similar products that require length fixation and frequent replacement of connecting plates. By setting the shape of the spinal plate to Y-shape, the principle of triangular stability can be used for three-point fixation, thus making the fixation more stable.

[0018] 3. Compared with existing technologies, by setting a spinal plate repositioning and fixing screw, the spinal plate repositioning and fixing screw can be tightly connected to the frustum threaded groove of the spinal plate repositioning and fixing plate, preventing the spinal plate repositioning and fixing screw from falling off or shifting. Furthermore, by utilizing the design of a double nut mechanism, the upper nut of the spinal plate repositioning and fixing screw can engage with the left and right calipers of the installation instrument, while the lower nut can engage with the cylindrical placement groove, thereby ensuring that the spinal plate repositioning and fixing screw is firmly fixed, preventing the screw from falling off the installation instrument, and preventing the installation instrument from slipping onto other tissues or even damaging the spinal cord nerves.

[0019] 4. Compared with existing technologies, by setting transverse slots, it is convenient to suture the muscles next to the spinous process of the vertebral lamina and eliminate the residual cavity next to the spinous process of the vertebral lamina; by setting the length of the vertebral lamina reduction and fixation screw, it is appropriate to the thickness of the removed spinous process of the vertebral lamina, avoiding the vertebral lamina reduction and fixation screw from penetrating the removed spinous process of the vertebral lamina and damaging the tissues inside the spinal canal, thereby ensuring stable fixation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure.

[0022] Figure 3 This is a schematic diagram of the double nut mechanism of the present invention.

[0023] The attached figures are labeled as follows: 1. Spinal plate repositioning and fixation plate; 11. Main fixing plate; 111. First mounting hole; 112. Adjustment groove; 113. Transverse hole groove; 12. Secondary fixing plate; 121. Second mounting hole; a. Cylindrical placement groove; b. Frustum threaded groove; 2. Screws for spinal plate repositioning and fixation; 3. Install the equipment; 31. Screwdriver; 32. Retaining socket; 33. Return spring; 34. Left caliper; 35. Right caliper; 4. Double nut mechanism; 41. Lower nut; 42. Upper nut. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] As attached Figure 1 Appendix Figure 2 and attached Figure 3 The spinal plate repositioning and fixation system shown includes: a spinal plate repositioning and fixation plate 1, a spinal plate repositioning and fixation screw 2, and an installation device 3 for grasping the spinal plate repositioning and fixation screw 2. The spinal plate repositioning and fixing plate 1 includes a main fixing plate 11 and a secondary fixing plate 12. One end of the main fixing plate 11 is fixedly connected to at least two secondary fixing plates 12 as a whole. At least three first mounting holes 111 are provided at the central axis of the main fixing plate 11. A second mounting hole 121 is provided at the end of the secondary fixing plate 12 away from the main fixing plate 11. The spinal plate repositioning and fixing screw 2 is installed in the first mounting hole 111 and the second mounting hole 121. An adjusting groove 112 for sliding of the spinal plate repositioning and fixing screw 2 is provided between the at least three first mounting holes 111. The head of the spinal plate repositioning and fixing screw 2 is provided with a double nut mechanism 4.

[0026] Among them, the spinal plate repositioning and fixing plate 1 and the spinal plate repositioning and fixing screw 2 are both made of titanium alloy. In this design, the position of the vertebral plate repositioning and fixing screw 2 installed in the main fixation plate 11 is adjusted according to the size of the gap between the residual bone of the spinous process of the removed vertebral plate and the bone of the vertebral plate or inferior articular process. Even if the vertebral plate repositioning and fixing screw 2 on the secondary fixation plate 12 has been installed and fixed, the length of the vertebral plate repositioning and fixing screw 2 in the main fixation plate 11 can still be adjusted by sliding. Therefore, it is not necessary to remove the vertebral plate repositioning and fixing screw 2 and repeat the installation operation, which makes the operation simpler and more convenient and saves surgical time. Therefore, this design improves the drawbacks of existing similar products that require fixed length and frequent replacement of connecting plates. In a preferred embodiment, as shown in the appendix Figure 1 Appendix Figure 2 and attached Figure 3 As shown, the spinal plate repositioning and fixation plate 1 is Y-shaped; Among them, the main fixation plate 11 of the spinal plate reduction and fixation plate 1 is designed to install at least three first mounting holes 111 of the spinal plate reduction and fixation screw 2, so that the removed spinous process bone of the vertebral plate is fixed to the spinal plate reduction and fixation plate 1 at least 3 points. The design utilizes at least two auxiliary fixation plates 12 of the spinal plate reduction and fixation plate 1. Since the spinal plate reduction and fixation screw 2 is installed in the second mounting hole 121 at the end of the auxiliary fixation plate 12, the vertebral plate or inferior articular process bone is fixed at at least two points. Then, by installing the spinal plate repositioning and fixing screw 2 in the first mounting hole 111, the Y-shaped spinal plate repositioning and fixing plate 1 is fixed in a triangular shape at least 3 points, thereby preventing movement between the spinous process bone of the vertebral plate and the bone of the vertebral plate or inferior articular process; improving the disadvantages of unstable straight plate fixation.

[0027] In a preferred embodiment, as shown in the appendix Figure 1 Appendix Figure 2 and attached Figure 3 As shown, the double nut mechanism 4 includes: a lower nut 41 that connects to the body of the spinal plate repositioning and fixing screw 2 and an upper nut 42 that connects to the lower nut 41. Both the lower nut 41 and the upper nut 42 are set in the shape of a frustum, and the maximum diameter of the upper nut 42 is smaller than the maximum diameter of the lower nut 41.

[0028] The first mounting hole 111 and the second mounting hole 121 are both divided into two types along the installation direction of the spinal plate repositioning and fixing screw 2: cylindrical placement groove a and frustum threaded groove b. The spinal plate repositioning and fixing screw 2 is threadedly connected to the frustum threaded groove b. The maximum diameter of the lower nut 41 is greater than the maximum diameter of the frustum threaded groove b, and the maximum diameter of the lower nut 41 is less than the diameter of the cylindrical placement groove a. The lower nut 41 is engaged with the cylindrical placement groove a.

[0029] The installation device 3 includes a screwdriver 31 and a fixing sleeve 32. The fixing sleeve 32 is movably sleeved on the handle end of the screwdriver 31. The handle end of the screwdriver 31 is fixedly connected to the inner wall of the end of the fixing sleeve 32 via a return spring 33. A left caliper 34 and a right caliper 35 distributed on both sides of the screwdriver 31 are fixedly connected to the end of the fixing sleeve 32 away from the return spring 33. The left caliper 34 and the right caliper 35 are both engaged with the upper nut 42 at the end away from the fixing sleeve 32.

[0030] Among them, the spinal plate repositioning and fixing screw 2 can be locked in the frustum threaded groove b opened in the spinal plate repositioning and fixing plate 1 to prevent the spinal plate repositioning and fixing screw 2 from falling off and shifting. Furthermore, by utilizing the design of the double nut mechanism 4, the upper nut 42 of the spinal plate repositioning and fixing screw 2 is engaged with the left clamp 34 and right clamp 35 of the installation instrument 3, thereby ensuring that the spinal plate repositioning and fixing screw 2 is firmly fixed, preventing the screw from falling off the installation instrument 3, and preventing the installation instrument 3 from slipping onto other tissues or even damaging the spinal cord nerves.

[0031] Among them, the installation instrument 3 changed the commonly used simple screwdriver head, and the tightening caliper design of the installation instrument 3 not only fixes the screw during the installation process and prevents the screw from falling off, but also increases the gripping area to prevent the installation instrument 3 from slipping and damaging other tissues. The fixed sleeve 32 is movably sleeved on the handle end of the screwdriver 31, and the screwdriver 31 can slide within the fixed sleeve 32. Preferably, the handle end of the screwdriver 31 and the inner cavity of the fixed sleeve 32 are shaped to prevent rotation, so that there is no rotation between the handle end of the screwdriver 31 and the fixed sleeve 32. In a preferred embodiment, as shown in the appendix Figure 1 Appendix Figure 2 and attached Figure 3 As shown, the width of the adjusting slide 112 is equal to the minimum diameter of the frustum threaded groove b, and the width of the adjusting slide 112 is less than the maximum diameter of the lower nut 41; so that the body of the spinal plate repositioning and fixing screw 2 can slide along the adjusting slide 112 without being removed, and the lower nut 41 of the spinal plate repositioning and fixing screw 2 can engage with the cylindrical placement groove a and is not affected by the adjusting slide 112.

[0032] In a preferred embodiment, as shown in the appendix Figure 1 Appendix Figure 2 and attached Figure 3 As shown, the main fixation plate 11 has a transverse slot 113 on the side near the spinous process, which communicates with the adjustment groove 112; so that the transverse slot 113 can be used to facilitate the suturing of the muscles next to the spinous process of the vertebral lamina and eliminate the residual cavity next to the spinous process of the vertebral lamina.

[0033] Example 1 of spinal plate repositioning and fixation plate: The spinal plate reduction and fixation plate 1 has a total length of 20mm and a thickness of 0.8mm; The main fixing plate 11 is 15mm long and 4.2mm wide; The secondary fixing plate 12 is 0.8mm thick; the end of the secondary fixing plate 12 closest to the main fixing plate 11 is 2.4mm wide; the end of the secondary fixing plate 12 furthest from the main fixing plate 11 is 3mm wide and 5mm long. The distance between the ends of the two secondary fixing plates 12 furthest from the main fixing plate 11 is: 3mm at the narrowest point and 9mm at the widest point. The adjusting slide 112 has a depth of 0.8 mm and a width of 2 mm. The cylindrical placement groove a has a diameter of 2.2 mm and a depth of 0.5 mm; The minimum diameter of the frustum threaded groove b is 2mm, the maximum diameter is 2.2mm, and the depth is 0.3mm; The diameter of the transverse slot 113 is 0.6 mm; Example 2 of spinal plate reduction and fixation screws: The spinal plate reduction and fixation screw 2 is 6mm long; it is suitable for the thickness of the spinous process bone of the removed vertebral plate, so as to avoid the spinal plate reduction and fixation screw 2 penetrating the removed spinous process bone and damaging the tissues inside the spinal canal, and it can be stably fixed. The maximum diameter of the spinal plate repositioning and fixing screw 2 is 1.8mm; The lower layer nut 41 has a maximum diameter of 2.2mm and a thickness of 0.8mm; The upper nut 42 has a maximum diameter of 2mm and a thickness of 0.5mm.

[0034] A method for operating a spinal plate repositioning and fixation system, comprising a spinal plate repositioning and fixation system, the specific operation method of which is as follows: Step 1: Using the installation instrument 3 for grasping the spinal plate reduction and fixation screw 2, install one spinal plate reduction and fixation screw 2 into the first mounting hole 111 of the main fixation plate 11 in the spinal plate reduction and fixation plate 1, and connect the removed spinous process bone of the vertebral plate to the main fixation plate 11; at this time, the spinal plate reduction and fixation screw 2 is not locked with the first mounting hole 111. Step 2: Using the installation instrument 3 for grasping the spinal plate repositioning and fixing screw 2, install the two spinal plate repositioning and fixing screws 2 into the second mounting holes 121 of the two auxiliary fixing plates 12 in the spinal plate repositioning and fixing plate 1, and connect the vertebral plate or inferior articular process bone to the corresponding auxiliary fixing plate 12; at this time, the spinal plate repositioning and fixing screw 2 is locked with the second mounting hole 121. Step 3: Adjust the spinous process bone of the removed vertebral lamina and the residual bone of the vertebral lamina or inferior articular process according to the size of the gap between the bone fragments. If necessary, slide the spinous process bone repositioning screw 2 into the first mounting hole 111 that meets the requirements through the adjusting groove 112. Finally, lock the spinous process bone repositioning screw 2 into the suitable first mounting hole 111. Step 4: Based on the stability of the repositioned spinous process bone, continue to install the spinous process bone repositioning screw 2 in the remaining first mounting hole 111 to connect the spinous process bone to the main fixation plate 11. Step 5: Suture the removed lamina spinous process and supraspinous ligament to the normal supraspinous ligament remnant. Suture the muscle and soft tissue next to the lamina spinous process bone into the transverse foramen 113. Close the residual cavity next to the lamina spinous process bone. Tightly suture the muscle fascia next to the spinous process bone to the supraspinous ligament to reposition and fix the lamina spinous process bone.

[0035] In steps one through four, if the installation device 3 clamps the spinal plate repositioning and fixing screw 2, first pull the screwdriver 31 of the installation device 3 to compress the repositioning spring 33, then place the upper nut 42 of the spinal plate repositioning and fixing screw 2 between the left caliper 34 and the right caliper 35, so that the left caliper 34 and the right caliper 35 are engaged with the upper nut 42, then release the screwdriver 31 to push against the spinal plate repositioning and fixing screw 2, so that the spinal plate repositioning and fixing screw 2 is clamped between the left caliper 34, the right caliper 35 and the screwdriver 31; If the spinal plate repositioning fixation screw 2 is removed, the repositioning spring 33 is compressed by pulling the screwdriver 31 of the installation instrument 3; If the spinal plate repositioning and fixing screw 2 is rotated, the screwdriver 31 with the same shape as the groove on the end face of the upper nut 42 of the spinal plate repositioning and fixing screw 2 can be used to rotate the screwdriver 31 or the fixing sleeve 32 to drive the installation device 3 to rotate.

[0036] In steps one through five, it is necessary to prevent the screws from coming loose or the installation device 3 from shifting and slipping into the spinal canal and damaging the spinal cord nerves during the installation of the spinal plate repositioning and fixing screw 2.

[0037] References: [1] Comparative analysis of the application of lamina-spinous ligament complex reduction technique in spinal canal tumor surgery (with analysis of 62 cases) [J], Journal of Stereotactic and Functional Neurosurgery, 2023, 36(5): 304-308 [2] Application of long-segment laminectomy-spinous process complex reimplantation for spinal canal reconstruction in long-segment spinal canal tumor surgery [J], Chinese Journal of Clinical Neurosurgery, 2023, 28(7): 437-439 [3] Application of ultrasonic bone scalpel laminectomy and laminectomy in spinal canal tumor surgery [J], Chinese Journal of Minimally Invasive Surgery, 2018, 18(2): 101-103, 109 It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A spinal plate repositioning and fixation system, characterized in that: The system includes: a spinal plate repositioning and fixing plate (1), a spinal plate repositioning and fixing screw (2), and an installation device (3) for gripping the spinal plate repositioning and fixing screw (2). The spinal plate repositioning and fixing plate (1) includes a main fixing plate (11) and a secondary fixing plate (12). One end of the main fixing plate (11) is fixedly connected to at least two secondary fixing plates (12) as a whole. At least three first mounting holes (111) are provided at the central axis of the main fixing plate (11). A second mounting hole (121) is provided at the end of the secondary fixing plate (12) away from the main fixing plate (11). The spinal plate repositioning and fixing screw (2) is installed in the first mounting hole (111) and the second mounting hole (121). An adjusting groove (112) for sliding the spinal plate repositioning and fixing screw (2) is provided between at least three of the first mounting holes (111). The head of the spinal plate repositioning and fixing screw (2) is provided with a double nut mechanism (4).

2. The spinal plate repositioning and fixation system according to claim 1, characterized in that: The double nut mechanism (4) includes: a lower nut (41) connecting the body of the spinal plate repositioning fixing screw (2) and an upper nut (42) connecting the lower nut (41). Both the lower nut (41) and the upper nut (42) are set in the shape of a frustum, and the maximum diameter of the upper nut (42) is smaller than the maximum diameter of the lower nut (41).

3. The spinal plate repositioning and fixation system according to claim 2, characterized in that: The first mounting hole (111) and the second mounting hole (121) are both divided into two parts along the installation direction of the spinal plate repositioning fixing screw (2): cylindrical placement groove (a) and frustum threaded groove (b). The spinal plate repositioning fixing screw (2) is threadedly connected to the frustum threaded groove (b). The maximum diameter of the lower nut (41) is greater than the maximum diameter of the frustum threaded groove (b), and the maximum diameter of the lower nut (41) is less than the diameter of the cylindrical placement groove (a). The lower nut (41) is engaged with the cylindrical placement groove (a). The thickness of the upper nut (42) is greater than the depth of the cylindrical placement groove (a).

4. The spinal plate repositioning and fixation system according to claim 1, characterized in that: The spinal plate repositioning fixation plate (1) is Y-shaped.

5. A spinal plate repositioning and fixation system according to claim 3, characterized in that: The width of the adjusting groove (112) is equal to the minimum diameter of the frustum threaded groove (b), and the width of the adjusting groove (112) is less than the maximum diameter of the lower nut (41).

6. The spinal plate repositioning and fixation system according to claim 2, characterized in that: The installation device (3) includes a screwdriver (31) and a fixing sleeve (32). The fixing sleeve (32) is movably sleeved on the handle end of the screwdriver (31). The handle end of the screwdriver (31) is fixedly connected to the inner wall of the end of the fixing sleeve (32) through a return spring (33). The end of the fixing sleeve (32) away from the return spring (33) is fixedly connected to a left caliper (34) and a right caliper (35) distributed on both sides of the screwdriver (31). The left caliper (34) and the right caliper (35) are both engaged with the upper nut (42) at the end away from the fixing sleeve (32).

7. The spinal plate repositioning and fixation system according to claim 1, characterized in that: The main fixing plate (11) has a transverse slot (113) on the side near the spine plate that communicates with the adjustment slide (112).

8. A method of operating a spinal plate repositioning and fixation system, comprising the spinal plate repositioning and fixation system as described in any one of claims 1-7, characterized in that: The specific operating method is as follows: Step 1: Using the installation instrument (3) for grasping the spinal plate reduction and fixation screw (2), insert a spinal plate reduction and fixation screw (2) into the first mounting hole (111) of the main fixation plate (11) in the spinal plate reduction and fixation plate (1), and connect the removed spinous process bone of the vertebral plate to the main fixation plate (11); at this time, the spinal plate reduction and fixation screw (2) is not locked with the first mounting hole (111); Step 2: Using the installation instrument (3) for grasping the spinal plate repositioning and fixing screws (2), the two spinal plate repositioning and fixing screws (2) are respectively installed into the second mounting holes (121) of the two auxiliary fixing plates (12) in the spinal plate repositioning and fixing plate (1), and the vertebral plate or inferior articular process bone is connected to the corresponding auxiliary fixing plate (12); at this time, the spinal plate repositioning and fixing screws (2) are locked with the second mounting holes (121); Step 3: Adjust the spinous process fixation screw (2) installed in the main fixation plate (11) according to the size of the gap between the spinous process bone of the removed vertebral lamina and the bone of the vertebral lamina or inferior articular process. If necessary, slide the spinous process fixation screw (2) into the first mounting hole (111) that meets the requirements through the adjustment groove (112). Finally, the spinous process fixation screw (2) is locked with the suitable first mounting hole (111). Step 4: Based on the stability of the repositioned spinous process bone, continue to install the spinal plate repositioning fixation screw (2) in the remaining first mounting hole (111) to connect the spinous process bone of the spinous process bone to the main fixation plate (11). Step 5: Suture the removed lamina spinous process supraspinous ligament to the normal supraspinous ligament remnant, suture the muscle and soft tissue next to the lamina spinous process bone into the transverse foramen (113), close the residual cavity next to the lamina spinous process bone, and tightly suture the muscle fascia next to the spinous process bone to the supraspinous ligament to reposition and fix the lamina spinous process bone.

9. The method of operating a spinal plate repositioning and fixation system according to claim 8, characterized in that: In steps one to four, if the installation device (3) clamps the spinal plate repositioning and fixing screw (2), first pull the screwdriver (31) of the installation device (3) to compress the repositioning spring (33), then place the upper nut (42) of the spinal plate repositioning and fixing screw (2) between the left caliper (34) and the right caliper (35), so that the left caliper (34) and the right caliper (35) are engaged with the upper nut (42), then release the screwdriver (31) to push against the spinal plate repositioning and fixing screw (2), so that the spinal plate repositioning and fixing screw (2) is clamped between the left caliper (34), the right caliper (35) and the screwdriver (31); If the spinal plate repositioning fixation screw (2) is removed, the repositioning spring (33) is compressed by pulling the screwdriver (31) of the installation device (3). If the spinal plate repositioning and fixing screw (2) is rotated, the screwdriver (31) with the same shape as the groove on the end face of the upper nut (42) of the spinal plate repositioning and fixing screw (2) is used to rotate the screwdriver (31) or the fixing sleeve (32) to drive the installation device (3) to rotate.

10. The method of operating a spinal plate repositioning and fixation system according to claim 8, characterized in that: In all steps one through five, it is necessary to prevent the screws from coming loose or the installation device (3) from shifting and slipping into the spinal canal and damaging the spinal cord nerves during the installation of the spinal plate repositioning and fixing screws (2).

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