Thoracic vertebra lamina reconstruction system

Abstract

The utility model discloses a thoracic vertebra vertebral plate reconstruction system, including arch bridge type artificial vertebral plate and set screw, arch bridge type artificial vertebral plate includes arc-shaped main part, fixed plate and anti-slip teeth, the fixed plate is provided with two, and the fixed plate is provided at the both ends of arc-shaped main part respectively, and the anti-slip teeth are provided at the joint of fixed plate and arc-shaped main part. The anti-skid teeth are arranged on one side far away from the arc; a mounting hole is formed in the middle of the fixing plate, and the fixing screw is matched with the fixing plate. The thoracic vertebra vertebral plate reconstruction system is an artificial vertebral plate reconstruction system which is simple in structure, convenient to install and beneficial to thoracic vertebra bone tissue growth.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to a thoracic vertebral laminar reconstruction system. Background Technology

[0002] Laminectomy for spinal decompression is a commonly used spinal decompression surgery suitable for patients with spinal stenosis caused by spinal degeneration, trauma, tumors, etc. However, laminectomy damages the posterior column structure of the spine, leading to spinal instability, and scar tissue proliferation in the laminectomy area can easily cause complications such as dural adhesions and spinal restenosis. Reconstruction of the laminectomy defect can restore spinal stability to a certain extent and form a mechanical barrier between the dura mater and posterior soft tissues, effectively preventing complications such as nerve adhesions and spinal restenosis.

[0003] Laminectomy is a spinal surgical technique that repairs the defect after laminectomy using an artificial lamina. Laminectomy restores the posterior column structure of the spine, effectively separates the dura mater from the posterior soft tissues, and has a good preventive effect against spinal instability, secondary scar adhesions, and spinal restenosis caused by laminectomy. An ideal artificial lamina should conform to the physiological morphology and anatomical characteristics of the human lamina, participate in the formation of the posterior wall of the spinal canal, protect the dura mater from compression, and prevent complications such as spinal restenosis after laminectomy.

[0004] Because of the physiological kyphosis of the thoracic spine, the incidence of dural scar adhesion and spinal restenosis after thoracic laminectomy is higher than that after lumbar and cervical laminectomy. Furthermore, since the transverse processes of the cervical and lumbar vertebrae are located anterior to the superior and inferior articular processes, there is no remaining space in the posterior column structure of the spine after cervical and lumbar laminectomy for the implantation and fixation of an artificial lamina. In contrast, the transverse processes of the thoracic vertebrae are almost on the same coronal plane as the superior and inferior articular processes. Anatomical studies have shown that the root of the transverse process and the isthmus of the articular process are ideal locations for implanting an artificial lamina.

[0005] Existing artificial lamina do not specify the specific sites where they can be used or the implantation methods. For example, Chinese utility model patent CN 102551923 B discloses an artificial lamina whose main body is an arc-shaped mesh structure with lateral wings on both sides and screw holes on the lateral wings. The dorsal side of the mesh structure has mesh spinous processes. This artificial lamina is similar in structure to the physiological morphology of the human lamina, but it lacks lateral support. Its size, applicable sites, and implantation methods are not disclosed, which limits its clinical application. Summary of the Invention

[0006] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by this utility model is that existing artificial lamina are not applicable to the thoracic spine structure and do not describe specific application methods. This utility model provides a thoracic lamina reconstruction system, which is a simple artificial lamina reconstruction system that is easy to install and promotes the growth of thoracic vertebral bone tissue.

[0007] To achieve the above objectives, this utility model provides a thoracic vertebral laminar reconstruction system, including an arch-shaped artificial vertebral laminar plate and fixing screws. The arch-shaped artificial vertebral laminar plate includes an arc-shaped main body, a fixing plate, and anti-slip teeth. The fixing plate is configured as two pieces, respectively disposed at both ends of the arc-shaped main body. The anti-slip teeth are disposed at the connection between the fixing plate and the arc-shaped main body, and are disposed on the side away from the arc. The fixing plate has a mounting hole in the middle, and the fixing screws cooperate with the fixing plate.

[0008] Furthermore, a mounting hole is provided in the middle of the fixing plate, and the fixing screws are fixed through the mounting hole.

[0009] Furthermore, the curvature of the arc-shaped main body is similar to the physiological curvature of the human vertebral lamina.

[0010] Furthermore, the arc height of the curved body is 5-10mm, and the span is set to 10-20mm.

[0011] Furthermore, the thickness of the curved body is 1-2mm, and the width is 6-12mm.

[0012] Furthermore, the thickness of the fixing plate is the same as the thickness of the curved body, the width of the fixing plate is the same as the width of the curved body, and the length of the fixing plate is 6-10mm.

[0013] Furthermore, the angle between the anti-slip teeth and the fixing plate is set to 90°.

[0014] Furthermore, the height of the anti-slip teeth is 2-3mm.

[0015] Furthermore, the diameter of the fixing screw is set to one of 3.5mm, 4.0mm and 4.5mm, and the length of the fixing screw is 8-24mm.

[0016] Technical effect

[0017] This invention relates to an application method of a thoracic vertebral laminar reconstruction system, specifically designed for thoracic vertebral laminar reconstruction. The arch-shaped design of the artificial vertebral laminar plate can expand the spinal canal volume and effectively prevent long-term complications such as spinal canal restenosis and nerve adhesion after laminectomy. Furthermore, it has fewer components and is easy to install. In special circumstances where a second surgery is required for removal, the screws in the fixation plate can be loosened directly, and the artificial vertebral laminar reconstruction system can be freely removed.

[0018] The following will further explain the concept, specific structure and technical effects of this utility model in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of this utility model. Attached Figure Description

[0019] Figure 1 This is a front view of an arch-shaped artificial vertebral plate according to a preferred embodiment of the present invention;

[0020] Figure 2 This is a side view of an arch-shaped artificial vertebral plate according to a preferred embodiment of the present invention;

[0021] Figure 3 This is a top view of an arch-shaped artificial vertebral plate according to a preferred embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of a fixing screw according to a preferred embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of a preferred embodiment of the thoracic vertebral body of the present invention;

[0024] Figure 6 This is a schematic diagram of a preferred embodiment of the present invention, involving laminectomy of the thoracic vertebrae.

[0025] Figure 7 This is a schematic diagram of thoracic vertebral laminar reconstruction using an artificial vertebral laminar ...

[0026] Among them, 1-arc-shaped main body, 2-fixing plate, 3-anti-slip teeth, 4-mounting hole, 5-fixing screw, 6-rib, 7-transverse process, 8-articular isthmus, 9-pedicle, 10-spinous process, 11-lamina, 12-spinal cord, 13-vertebral body, 14-inner edge of isthmus. Detailed Implementation

[0027] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model 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 of the present utility model and are not intended to limit the present utility model.

[0028] In the following description, specific details, such as particular internal procedures and techniques, are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention may be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of the present invention with unnecessary detail.

[0029] like Figure 1-4 As shown, this utility model embodiment provides a thoracic vertebral laminar reconstruction system, including an arch-shaped artificial vertebral laminar ...

[0030] The artificial lamina has an anatomical structure similar to that of the human lamina, and the curvature of the arch-shaped lamina is similar to the physiological curvature of the human lamina. The height of the arch is slightly higher than the distance from the dura mater to the posterior wall of the spinal canal, and the span of the arch is consistent with the width of the resected lamina. After laminectomy, an artificial lamina of appropriate height and span can be selected for reconstruction of the lamina defect. Fixation plates on both sides of the artificial lamina are installed on the back of the transverse process root and the isthmus of the articular process, so that the anti-slip teeth are tightly embedded in the medial edge of the isthmus of the articular process. The fixation plates are fixed to the isthmus of the articular process and the transverse process root through the mounting holes on the fixation plates, thus reconstructing the posterior wall of the spinal canal. The arch-shaped lamina separates the dura mater from the posterior soft tissue, preventing dural adhesion and spinal canal restenosis. In this embodiment, the shape of the arc-shaped main body is similar to the anatomical morphology of the human thoracic vertebral lamina. The artificial lamina participates in the formation of the posterior wall of the spinal canal, maintains the integrity of the spinal canal, and prevents posterior scar hyperplasia that could cause spinal canal restenosis and spinal cord compression.

[0031] In this embodiment, the arc height of the arc-shaped main body is 5-10mm, and the span is set to 10-20mm. The thickness of the arc-shaped main body is 1-2mm, and the width is 6-12mm. Different sizes of artificial lamina are selected according to the individualized thoracic vertebral laminectomy range. Based on clinical research and imaging measurement results, the artificial lamina reconstruction system is manufactured in different sizes.

[0032] The thickness of the fixing plate is the same as the thickness of the curved body, the width of the fixing plate is the same as the width of the curved body, and the length of the fixing plate is 6-10mm.

[0033] The angle between the anti-slip teeth and the fixing plate is set at 90°, and the height of the anti-slip teeth is 2-3mm. The teeth are tightly fitted into the inner edge of the articular isthmus to prevent the artificial vertebral plate from sliding to the sides.

[0034] In this embodiment, the nut of the fixing screw matches the mounting hole on the fixing plate, the diameter of the fixing screw is set to one of 3.5mm, 4.0mm and 4.5mm, and the length of the fixing screw is 8-24mm.

[0035] In this embodiment of the invention, the thoracic vertebral laminar reconstruction system can be made of non-degradable materials commonly used in spinal surgery, such as titanium alloy and stainless steel, or it can be made of degradable medical metal materials such as magnesium alloy and zinc alloy. Furthermore, the surface of the laminar reconstruction system can be coated with a calcium phosphate coating, a micro-arc oxidation coating, or a polymer coating to promote bone tissue growth. The fixing screws are made of the same material as the artificial vertebral laminar plate.

[0036] The following will specifically describe the application method of a thoracic vertebral laminar reconstruction system according to an embodiment of this utility model, such as... Figure 5-7 As shown, it includes the following steps:

[0037] Based on the extent of thoracic lamina resection, select a thoracic lamina reconstruction system of appropriate size to ensure that the anti-slip teeth 3 on both sides and the inner edge 14 of the facet joint areola achieve a close fit.

[0038] A thoracic vertebral laminar reconstruction system of appropriate size is implanted at the vertebral laminar defect. The position of the artificial vertebral laminar plate is precisely adjusted so that the fixation plate covers the surface of the isthmus 8 and the root of the transverse process 7, and the anti-slip teeth are embedded in the inner edge 14 of the isthmus.

[0039] Screw in the fixing screw 5. The fixing screw 5 is tilted 30-45° towards the head of the body and 0-20° towards the outside of the body. The fixing screw 5 passes through the articular isthmus 8 and the root of the transverse process, and exits on the ventral side of the root of the transverse process and the outer edge of the pedicle 9. The artificial lamina is tightly fixed to the dorsal side of the lamina defect. After fixation, the distance between the spinal cord 12 and the arch of the artificial lamina is 5-10mm.

[0040] The laminectomy is performed according to the clinical laminectomy procedure, and includes the medial half of the bilateral facet joints, the entire lamina 11 and spinous process 10, while preserving the lateral half of the bilateral facet joints and the isthmus of the facet joints.

[0041] The thoracic vertebral laminar reconstruction system provided by this invention is installed at the isthmus of the facet joint, allowing the fixation screw to enter the pedicle through the isthmus and penetrate the lateral cortex of the pedicle. This dual cortical fixation enhances the fixation effect. Simultaneously, the screw is inserted at an outward tilt to prevent it from entering the spinal canal and damaging nerves.

[0042] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A thoracic vertebral laminar reconstruction system, characterized in that, The device includes an arch-shaped artificial vertebral plate and fixing screws. The arch-shaped artificial vertebral plate includes an arc-shaped body, a fixing plate, and anti-slip teeth. The fixing plate is configured as two pieces, respectively disposed at both ends of the arc-shaped body. The anti-slip teeth are disposed at the connection between the fixing plate and the arc-shaped body, and are disposed on the side away from the arc. The fixing plate has a mounting hole in the middle, and the fixing screws cooperate with the fixing plate.

2. The thoracic vertebral laminar reconstruction system as described in claim 1, characterized in that, The fixing screw is used for fixing through the mounting hole.

3. The thoracic vertebral laminar reconstruction system as described in claim 1, characterized in that, The curvature of the arc-shaped main body is similar to the physiological curvature of the human vertebral lamina.

4. The thoracic vertebral laminar reconstruction system as described in claim 3, characterized in that, The arc height of the arc-shaped main body is 5-10mm, and the span is set to 10-20mm.

5. The thoracic vertebral laminar reconstruction system as described in claim 1, characterized in that, The thickness of the arc-shaped body is 1-2mm, and the width is 6-12mm.

6. The thoracic vertebral laminar reconstruction system as described in claim 5, characterized in that, The thickness of the fixing plate is the same as the thickness of the arc-shaped body, the width of the fixing plate is the same as the width of the arc-shaped body, and the length of the fixing plate is 6-10mm.

7. The thoracic vertebral laminar reconstruction system as described in claim 1, characterized in that, The angle between the anti-slip teeth and the fixing plate is set to 90°.

8. The thoracic vertebral laminar reconstruction system as described in claim 7, characterized in that, The height of the anti-slip teeth is 2-3mm.

9. The thoracic vertebral laminar reconstruction system as described in claim 1, characterized in that, The diameter of the fixing screw is set to one of 3.5mm, 4.0mm and 4.5mm, and the length of the fixing screw is 8-24mm.

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