Artificial vertebral plate

Abstract

The utility model discloses an artificial vertebral plate which comprises a first protection plate, a second protection plate and fixing nails, the first protection plate and the second protection plate are of an arch structure, the first protection plate and the second protection plate are connected in a clamped mode, and the first protection plate and the second protection plate 2 are fixed to the two sides of a spine after a vertebral plate resection operation through the fixing nails; the fixing device is simple in structure, convenient to use, firm in fixation, convenient to detach and capable of blocking soft tissues such as closed muscles when an incision is closed, so that the spinal cord is prevented from being pressed and adhered, serious complications such as neurological symptoms and even paralysis after an operation are avoided, and a patient can implant and use the fixing device for a long time.

Description

Technical Field

[0001] This utility model relates to the medical field, and in particular to an artificial vertebral lamina. Background Technology

[0002] In spinal surgery, laminectomy is often performed to relieve nerve compression. After laminectomy, the dura mater, or spinal cord, is exposed without the protection of the laminae. Since most patients do not experience spinal cord compression symptoms, no measures are currently taken clinically to protect the spinal cord. However, if the laminectomy is extensive, the exposed spinal cord area will also be large. After surgery, the muscles and other soft tissues separated on both sides can come together and compress the spinal cord, potentially leading to paralysis. Furthermore, as the technique of total laminectomy for treating spinal stenosis has become increasingly sophisticated, postoperative complications such as laminar regeneration and subsequent spinal stenosis have gained attention. There are numerous reports of complete laminar regeneration both domestically and internationally. After total laminectomy, the laminae can partially or completely regenerate, and the regenerated laminae can lead to spinal stenosis. Experts such as Shen Kangping believe that the mechanism of spinal canal restenosis after total laminectomy is as follows: fibroblasts invade the defect area, fibrous tissue gradually forms, fills the defect area of ​​the lamina and compresses the spinal cord. As the fibrous tissue evolves into cartilage and bone tissue until the lamina regeneration is completed, this compression persists. Fibrosis is mainly caused by fibroblasts invading the intermuscular hematoma due to damage to the rough surface of the sacrospinalis muscle on the dorsal side. Simultaneously, research has found that peridural fibrosis originates from both posteriorly damaged sacrospinalis muscles and anteriorly damaged annulus fibrosus and posterior longitudinal ligament. Furthermore, anterior adhesions can wrap around nerve roots, leading to lateral involvement. This has led to the first proposal of a three-dimensional theory of fibrosis formation.

[0003] Currently, scholars both domestically and internationally employ various physical and chemical methods to prevent peridural adhesions after laminectomy. For example, semi-fluid materials (chitosan, hyaluronic acid) are used to fill the dural sac and around the nerve roots to achieve a three-dimensional barrier effect. However, due to their high fluidity, local medications cannot remain stable, resulting in poor efficacy. Furthermore, some patients lack artificial lamina replacements after laminectomy, and the closing of the incision by muscles and other soft tissues can compress the spinal cord, easily leading to neurological symptoms and even paralysis. Utility Model Content

[0004] The purpose of this invention is to solve the problems mentioned above, such as the lack of artificial vertebral lamina after existing spinal laminectomy, the compression of the spinal cord by the closed muscles and other soft tissues during the incision, the easy occurrence of neurological symptoms, and even paralysis, and to provide an artificial vertebral lamina.

[0005] An artificial vertebral lamina includes a first protective plate, a second protective plate, and fixation pins. The first and second protective plates are arched structures and are interlocked with each other. The first and second protective plates are fixed to both sides of the spine after laminectomy by fixation pins.

[0006] The first protective plate is provided with a first elongated hole, and the first protective plate is also provided with several first extended protective plates evenly.

[0007] The second protective plate is provided with a second elongated hole, and several second extended protective plates are also evenly provided on the second protective plate;

[0008] The first and second extended guard plates are staggered and can be interlocked. The first and second guard plates are also interlocked and snapped together by the cooperation of the first and second extended guard plates.

[0009] The following precautions should be taken when performing this laminectomy:

[0010] 1. Spinal decompression should be as thorough as possible, including nerve root canal decompression and nerve root release, while preserving facet joints as much as possible;

[0011] 2. Select artificial lamina of different specifications according to the size of the lamina defect measured during the operation. Before placing the artificial lamina, it needs to be properly trimmed to fit tightly into the defect.

[0012] 3. Thorough hemostasis must be achieved during the operation, especially within the spinal canal;

[0013] 4. During the operation, cancellous bone particles need to be implanted between the facet joints and next to the artificial lamina to facilitate early fusion of the fixation segment. For patients who cannot achieve fusion of the corresponding segment, it is not recommended to place an artificial lamina.

[0014] The beneficial effects of this utility model are:

[0015] This utility model has a simple structure, is easy to use, is firmly fixed, and is easy to disassemble. It can block the closing of soft tissues such as muscles when the incision is closed, so as to prevent the spinal cord from being compressed and adhered, and avoid serious complications such as postoperative neurological symptoms or even paralysis. Patients can implant and use it for a long time. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0017] Figure 2 This is a three-dimensional schematic diagram of the first protective plate of this utility model;

[0018] Figure 3 This is a three-dimensional schematic diagram of the second protective plate of this utility model;

[0019] Figure 4 This is a schematic diagram of the first state when this utility model is in use;

[0020] Figure 5 This is a schematic diagram of the second state when the present invention is in use. Detailed Implementation

[0021] Please see Figures 1 to 5 An artificial vertebral lamina is shown, comprising a first protective plate 1, a second protective plate 2, and fixation nails 3. The first protective plate 1 and the second protective plate 2 are arched structures, and the first protective plate 1 and the second protective plate 2 are interlocked with each other. The first protective plate 1 and the second protective plate 2 are fixed to both sides of the spine after laminectomy by fixation nails 3.

[0022] Specifically, after spinal laminectomy, the first protective plate 1 and the second protective plate 2 are fixed to both sides of the surgical site with fixation nails 3. Since the first protective plate 1 and the second protective plate 2 are arched structures, they can cover and protect the exposed spinal cord.

[0023] The first protective plate 1 is provided with a first elongated hole 11, and the first protective plate 1 is also provided with several first extended protective plates 12 evenly.

[0024] The second guard plate 2 is provided with a second elongated hole 21, and several second extended guard plates 22 are also evenly provided on the second guard plate 2;

[0025] The first extended guard plate 12 and the second extended guard plate 22 are staggered and can be interlocked. The first guard plate 1 and the second guard plate 2 are interlocked and snapped together by the first extended guard plate 12 and the second extended guard plate 22.

[0026] Specifically, after a spinal laminectomy, fixation nails 3 pass through the first elongated oval hole 11 on the first protective plate 1 and the second elongated oval hole 21 on the second protective plate 2 to fix the first protective plate 1 and the second protective plate 2 to both sides of the surgical site. The function of the first elongated oval hole 11 and the second elongated oval hole 21 is to facilitate the doctor to install the fixation nails 3. The relative front-to-back position of the first protective plate 1 and the second protective plate 2 can be adjusted through the first elongated oval hole 11 and the second elongated oval hole 21. The first protective plate 1 and the second protective plate 2 are engaged together by the first extension protective plate 12 and the second extension protective plate 22. During the patient's recovery process, the relative position of the first protective plate 1 and the second protective plate 2 will change, and the first protective plate 1 and the second protective plate 2 will rotate relative to each other. When the first protective plate 1 and the second protective plate 2 rotate relative to each other, the first extension protective plate 12 and the second extension protective plate 22 can also overlap to form a complete arch, which can cover and protect the exposed spinal cord.

[0027] The working principle and process of this utility model:

[0028] In spinal surgery, a laminectomy is performed to expose the spinal cord and complete decompression. First, the first and second protective plates 1 and 2 are placed above the spine for positioning. These plates can rotate relative to each other under the action of the first extension plate 12 and the second extension plate 22, facilitating positioning. Then, based on the positions of the first and second elongated holes 11 and 21, two threaded holes are drilled along the pedicles on both sides of the intended segment for laminectomy reconstruction. Fixation nails 3 are passed through the first elongated hole 11, engaging with the threaded hole on the side of the first protective plate 1. Tightening the fixation nails 3 secures the first protective plate 1. Similarly, fixation nails 3 are passed through the second elongated hole 21, engaging with the threaded hole on the side of the second protective plate 2. Tightening the fixation nails 3 secures the second protective plate 2. Once installed, the laminectomy is positioned above the spinal cord, thus preventing the closure of the incision by muscles and other soft tissues, avoiding spinal cord compression and preventing serious postoperative complications such as neurological symptoms or even paralysis.

Claims

1. An artificial vertebral lamina, characterized in that: It includes a first guard plate (1), a second guard plate (2) and fixation nails (3). The first guard plate (1) and the second guard plate (2) are arched structures. The first guard plate (1) and the second guard plate (2) are interlocked with each other. The first guard plate (1) and the second guard plate (2) are fixed to both sides of the spine after laminectomy by fixation nails (3). The first guard plate (1) is provided with a first elongated hole (11), and several first extended guard plates (12) are also evenly provided on the first guard plate (1). The second guard plate (2) is provided with a second elongated hole (21), and several second extended guard plates (22) are also evenly provided on the second guard plate (2). The first extension guard plate (12) and the second extension guard plate (22) are staggered and can be interlocked. The first guard plate (1) and the second guard plate (2) are interlocked and snapped together by the first extension guard plate (12) and the second extension guard plate (22). Two threaded holes are drilled on both sides of the pedicle of the vertebral segment where the vertebral laminar reconstruction is to be performed. The fixation nail (3) is passed through the first elongated hole (11). The fixation nail (3) is engaged with the threaded hole on the side of the first protective plate (1). The fixation nail (3) is tightened to fix the first protective plate (1). The fixation nail (3) is passed through the second elongated hole (21). The fixation nail (3) is engaged with the threaded hole on the side of the second protective plate (2). The fixation nail (3) is tightened to fix the second protective plate (2). The installation is complete.

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