Thoracic vertebra lamina reconstruction system and application method thereof

Abstract

The invention discloses a thoracic vertebra vertebral plate reconstruction system and an application method thereof.The thoracic vertebra vertebral plate reconstruction system comprises an arch bridge type artificial vertebral plate and fixing screws, the arch bridge type artificial vertebral plate comprises an arc-shaped body, two fixing plates and anti-skid teeth, and the two fixing plates are arranged at the two ends of the arc-shaped body respectively; the anti-skid teeth are arranged at the joint of the fixed plate and the arc-shaped main body, and are arranged on one side far away from the arc shape; a mounting hole is formed in the middle of the fixing plate, and the fixing screw is matched with the fixing plate. According to the thoracic vertebra vertebral plate reconstruction system and the application method thereof, the artificial vertebral plate reconstruction system is simple in structure, convenient to install and beneficial to thoracic vertebra bone tissue growth.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a thoracic vertebral lamina reconstruction system and an application method thereof. Background Art

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

[0003] Vertebral reconstruction is a spinal surgery technique that uses artificial vertebral lamina to repair the defective part after laminectomy. Vertebral reconstruction can restore the structure of the posterior column of the spine and effectively separate the dura mater sac from the posterior soft tissue. It has a good preventive effect on spinal instability, secondary scar adhesion, and spinal canal restenosis caused by laminectomy. The ideal artificial vertebral lamina should conform to the physiological morphology and anatomical characteristics of the human vertebral 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 canal restenosis after laminectomy.

[0004] Due to the physiological kyphosis of the thoracic spine, the probability of dura mater scar adhesion and spinal canal restenosis after thoracic laminectomy is higher than that of lumbar and cervical spine. In addition, since the transverse processes of the cervical and lumbar vertebrae are located in front of the upper and lower articular processes, there is no remaining space in the posterior column structure of the spine for implantation and fixation of artificial lamina after cervical and lumbar laminectomy, while the transverse processes of the thoracic spine are almost on the same coronal plane as the upper and lower articular processes. According to anatomical research, the root of the transverse process of the thoracic spine and the isthmus of the articular process are ideal locations for implanting artificial lamina.

[0005] The artificial vertebral plate in the prior art does not introduce the specific position and implantation method where it can be used. For example, Chinese invention patent CN 102551923 B discloses an artificial vertebral plate, the main body of which is an arc-shaped mesh structure, with side wings on both sides of the mesh vertebral plate, screw holes on the side wings, and mesh spinous projections on the dorsal side of the mesh structure. The artificial vertebral plate is similar in structure to the physiological morphology of the human vertebral plate, but lacks support on the side. Its size, specific applicable position and implantation method are not disclosed, which limits its clinical application. Summary of the invention

[0006] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that the existing artificial vertebral plate cannot be applied to the thoracic vertebra structure and no specific application method is introduced. The present invention provides a thoracic vertebral plate reconstruction system and its application method, which is an artificial vertebral plate reconstruction system with simple structure, convenient installation and conducive to the growth of thoracic vertebral bone tissue.

[0007] To achieve the above-mentioned purpose, the present invention provides a thoracic vertebral lamina reconstruction system, including an arch bridge type artificial vertebral lamina and a fixing screw. The arch bridge type artificial vertebral lamina includes an arc-shaped main body, a fixing plate and anti-slip teeth. The fixing plate is provided in two pieces, which are respectively arranged at the two ends of the arc-shaped main body. The anti-slip teeth are arranged at the connection between the fixing plate and the arc-shaped main body, and the anti-slip teeth are arranged on the side away from the arc; an installation hole is provided in the middle of the fixing plate, and the fixing screw cooperates with the fixing plate.

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

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

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

[0011] Furthermore, the arc-shaped body has a thickness of 1-2 mm and a width of 6-12 mm.

[0012] Furthermore, the thickness of the fixing plate is consistent with the thickness of the arc-shaped body, the width of the fixing plate is consistent with the width of the arc-shaped body, and the length of the fixing plate is 6-10 mm.

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

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

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

[0016] Another preferred embodiment of the present invention provides an application method of a thoracic vertebral lamina reconstruction system, comprising the following steps:

[0017] According to the resection range of the thoracic vertebral lamina, select the appropriate size of the thoracic vertebral lamina reconstruction system to ensure that the anti-slip teeth on both sides and the inner edge of the articular process isthmus are in close contact;

[0018] The thoracic vertebral lamina reconstruction system of appropriate size is implanted in the lamina defect, and the position of the artificial lamina is precisely adjusted so that the fixation plate covers the surface of the articular process isthmus and the root of the transverse process, and the anti-slip teeth are embedded in the inner edge of the articular process isthmus.

[0019] Screw in the fixing screw, which is tilted 30-45° toward the head end of the body and 0-20° to the outside. The fixing screw passes through the isthmus of the articular process and the root of the transverse process, and comes out from the ventral side of the root of the transverse process and the outer edge of the pedicle to tightly fix the artificial vertebral lamina on the dorsal side of the vertebral lamina defect. After fixation, the distance between the spinal cord and the back arch of the artificial vertebral lamina is 5-10mm.

[0020] Technical Effects

[0021] The application method of the thoracic vertebral lamina reconstruction system of the present invention is specifically used for thoracic vertebral lamina reconstruction, wherein the arch bridge design of the artificial vertebral lamina can expand the volume of the spinal canal and effectively prevent long-term complications such as spinal canal restenosis and nerve adhesion after laminectomy; it has few components and is easy to install; when a second operation is required to remove it under special circumstances, the screws in the fixing plate are directly loosened, and the artificial vertebral lamina reconstruction system can be freely removed.

[0022] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a front view of an arch bridge type artificial vertebral plate according to a preferred embodiment of the present invention;

[0024] Figure 2 is a side view of an arch bridge type artificial vertebral plate according to a preferred embodiment of the present invention;

[0025] Figure 3 is a top view of an arch bridge type artificial vertebral plate according to a preferred embodiment of the present invention;

[0026] Figure 4 is a schematic diagram of a fixing screw of a preferred embodiment of the present invention;

[0027] Figure 5 is a schematic diagram of a thoracic vertebral body according to a preferred embodiment of the present invention;

[0028] Figure 6 is a schematic diagram of thoracic laminectomy according to a preferred embodiment of the present invention;

[0029] Figure 7 It is a schematic diagram of a preferred embodiment of the present invention for thoracic vertebral lamina reconstruction using an artificial lamina;

[0030] Among them, 1-arc-shaped body, 2-fixing plate, 3-anti-slip teeth, 4-mounting hole, 5-fixing screw, 6-rib, 7-transverse process, 8-articular process isthmus, 9-pedicle, 10-spinous process, 11-lamina, 12-spinal cord, 13-vertebral body, 14-inner edge of the isthmus. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] In the following description, specific details such as specific internal procedures and techniques are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0033] like Figure 1-4 As shown, an embodiment of the present invention provides a thoracic vertebral lamina reconstruction system, including an arch bridge type artificial lamina and a fixing screw, the arch bridge type artificial lamina includes an arc-shaped main body 1, a fixing plate 2 and anti-slip teeth 3, the fixing plate 2 is provided in two pieces, respectively arranged at the two ends of the arc-shaped main body 1, the anti-slip teeth 3 are arranged at the connection between the fixing plate 2 and the arc-shaped main body 1, and the anti-slip teeth 3 are arranged on the side away from the arc; a mounting hole 4 is provided in the middle of the fixing plate 2, and the fixing screw 5 cooperates with the fixing plate 2; the fixing screw is fixed through the mounting hole.

[0034] Artificial vertebral plate is similar to the anatomical structure of human vertebral plate, and the radian of arch bridge shaped vertebral plate main body is similar to the physiological curvature of human vertebral plate.The height of arch bridge is slightly higher than the distance from dura mater to the posterior wall of spinal canal, and the span of arch bridge is consistent with the width of excised vertebral plate.Artificial vertebral plate of suitable height and span can be selected to carry out the reconstruction of vertebral plate defect after laminectomy, the fixed plate on both sides of artificial vertebral plate is installed in the back side of transverse process root and articular process isthmus, anti-skid teeth are tightly embedded in the medial edge of articular process isthmus, be fixed to articular process isthmus and transverse process root with screw by the mounting hole on the fixed plate, rebuild the posterior wall of spinal canal, separate dura mater from rear soft tissue by arch bridge shaped vertebral plate, prevent dura mater adhesion and spinal canal restenosis.The profile of the arcuate main body of the present embodiment is similar to the anatomical form of human thoracic vertebral plate, and artificial vertebral plate participates in constituting the posterior wall of spinal canal, keeps the integrity of spinal canal, prevents the rear scar hyperplasia from causing spinal canal restenosis and spinal cord compression.

[0035] In this embodiment, the arc height of the arc body is 5-10mm, and the span is set to 10-20mm. The thickness of the arc body is 1-2mm, and the width is 6-12mm. Different specifications of artificial lamina are selected according to the personalized thoracic laminectomy range. According to clinical research and imaging measurement results, the artificial lamina reconstruction system is made into different sizes.

[0036] The thickness of the fixing plate is consistent with the thickness of the arc-shaped main body, the width of the fixing plate is consistent with the width of the arc-shaped main body, and the length of the fixing plate is 6-10 mm.

[0037] The angle between the anti-slip teeth and the fixing plate is set to 90°, and the rack height of the anti-slip teeth is 2-3 mm. The rack is tightly embedded in the inner edge of the articular process isthmus to prevent the artificial lamina from sliding to both sides.

[0038] 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 3.5 mm, 4.0 mm and 4.5 mm, and the length of the fixing screw is 8-24 mm.

[0039] In the embodiment of the present invention, the thoracic vertebral lamina reconstruction system can be made of non-degradable materials such as titanium alloy and stainless steel commonly used in spinal surgery, or can be made of degradable medical metal materials such as magnesium alloy and zinc alloy; further, the surface of the vertebral lamina reconstruction system can be coated with a calcium-phosphorus coating, a micro-arc oxidation coating or a polymer coating to facilitate bone tissue growth. The material of the fixing screw is consistent with the material of the artificial lamina.

[0040] like Figure 5-7 As shown, another preferred embodiment of the present invention provides an application method of a thoracic vertebral lamina reconstruction system, comprising the following steps:

[0041] According to the resection range of the thoracic vertebral lamina, a thoracic vertebral lamina reconstruction system of appropriate size is selected to ensure that the anti-slip teeth 3 on both sides and the inner edge 14 of the articular process isthmus are in close contact;

[0042] The thoracic vertebral lamina reconstruction system of appropriate size is implanted in the lamina defect, and the position of the artificial lamina is precisely adjusted so that the fixation plate covers the articular process isthmus 8 and the root surface of the transverse process 7, and the anti-slip teeth are embedded in the inner edge of the articular process isthmus 14.

[0043] The fixing screw 5 is screwed in, and the fixing screw 5 is tilted 30-45° toward the head end of the body and 0-20° toward the outside of the body. The fixing screw 5 passes through the isthmus of the articular process 8 and the root of the transverse process, and is screwed out at the ventral side of the root of the transverse process and the outer edge of the pedicle 9 to tightly fix the artificial vertebral plate on the dorsal side of the vertebral plate defect. After fixation, the distance between the spinal cord 12 and the arch back of the artificial vertebral plate is 5-10mm.

[0044] Among them, the laminectomy is performed according to the clinical laminectomy surgical method, and the range includes the medial 1 / 2 of the bilateral articular process joints, all vertebral laminae 11 and spinous processes 10, while retaining the lateral 1 / 2 of the bilateral articular process joints and the isthmus of the articular process.

[0045] The thoracic vertebral lamina reconstruction system provided by the present invention is installed in the articular process isthmus, so that the fixing screw can enter the pedicle through the articular process and penetrate the outer cortex of the pedicle, and the double cortex fixation enhances the fixation effect. At the same time, the screw is tilted to the outside when inserted to avoid the screw entering the spinal canal and damaging the nerve.

[0046] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A thoracic vertebral lamina reconstruction system, characterized in that: It comprises an arch bridge type artificial vertebral plate and fixing screws, wherein the arch bridge type artificial vertebral plate comprises an arc-shaped main body, a fixing plate and anti-slip teeth, wherein the fixing plate is provided in two pieces and respectively arranged at two ends of the arc-shaped main body, the anti-slip teeth are arranged at the connection between the fixing plate and the arc-shaped main body, and the anti-slip teeth are arranged on the side away from the arc; a mounting hole is provided in the middle of the fixing plate, and the fixing screw cooperates with the fixing plate.

2. A thoracic vertebral lamina reconstruction system as claimed in claim 1, characterized in that: The fixing screw is fixed through the mounting hole.

3. A thoracic vertebral lamina reconstruction system according to claim 1, characterized in that: The curvature of the arc-shaped main body is similar to the physiological curvature of the human vertebral plate.

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

5. A thoracic vertebral lamina reconstruction system according to claim 1, characterized in that: The arc-shaped body has a thickness of 1-2 mm and a width of 6-12 mm.

6. A thoracic vertebral lamina reconstruction system as claimed in claim 5, characterized in that: The thickness of the fixing plate is consistent with the thickness of the arc-shaped main body, the width of the fixing plate is consistent with the width of the arc-shaped main body, and the length of the fixing plate is 6-10 mm.

7. A thoracic vertebral lamina reconstruction system according to claim 1, characterized in that: The included angle between the anti-slip teeth and the fixing plate is set to 90°.

8. A thoracic vertebral lamina reconstruction system as claimed in claim 7, characterized in that: The rack height of the anti-slip teeth is 2-3 mm.

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

10. An application method of the thoracic vertebral lamina reconstruction system according to any one of claims 1 to 9, characterized in that: The following steps are involved: According to the resection range of the thoracic vertebral lamina, select the appropriate size of the thoracic vertebral lamina reconstruction system to ensure that the anti-slip teeth on both sides and the inner edge of the articular process isthmus are in close contact; The thoracic vertebral lamina reconstruction system of appropriate size is implanted in the lamina defect, and the position of the artificial lamina is precisely adjusted so that the fixation plate covers the surface of the articular process isthmus and the root of the transverse process, and the anti-slip teeth are embedded in the inner edge of the articular process isthmus. Screw in the fixing screw, which is tilted 30-45° toward the head end of the body and 0-20° to the outside. The fixing screw passes through the isthmus of the articular process and the root of the transverse process, and comes out from the ventral side of the root of the transverse process and the outer edge of the pedicle to tightly fix the artificial vertebral lamina on the dorsal side of the vertebral lamina defect. After fixation, the distance between the spinal cord and the back arch of the artificial vertebral lamina is 5-10mm.

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