Vertebral plate non-fusion fixing device

Abstract

The invention relates to the technical field of medical instruments, in particular to a vertebral plate non-fusion fixing device which comprises a vertebral plate fixing body. The upper supporting surface of the vertebral plate fixing main body is also provided with a backward movement prevention bulge; the anti-backward-movement bulge is of a triangular structure and is matched with the triangular three-dimensional space at the lower dome position of the vertebral plate in shape; and the backward movement prevention bulge is in direct contact with the lower dome of the vertebral plate so as to prevent the fixing device from moving towards the vertebral body of the spine. The vertebral plate non-fusion fixing device is installed at the vertebral plate gap position of adjacent vertebral bodies in the spine posterior non-fusion operation in a matched mode, the vertebral plate gap is expanded and fixed, and the folded posterior longitudinal ligament and the fibrous ring are stretched, so that the spinal canal stenosis degree is reduced, meanwhile, the upper diameter and the lower diameter of intervertebral foramen of the same section are increased, the nerve root canal cross section area is enlarged, and the spinal canal stenosis degree is improved. The nerve root stress is relieved. The fixing device can further enhance the stability of the spine at the segment, and meanwhile the spine motion range of the segment is reserved.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a vertebral plate non-fusion fixation device. Background Art

[0002] Lumbar degenerative disease is a condition caused by degenerative changes in the vertebral bodies, intervertebral discs, and other structures surrounding the spine, and typically develops with aging. Such conditions can lead to decreased disc height, spinal stenosis, spinal instability, and ultimately pain and neurological impairment. These symptoms are typically progressive and negatively impact daily life and work. Current treatments for lumbar degenerative disease include conservative or surgical treatment. Conservative treatment aims to relieve symptoms and improve quality of life; surgical treatment typically includes fusion and non-fusion procedures to restore normal disc height, stabilize the spine, relieve nerve compression, and relieve symptoms.

[0003] Non-fusion spinal technology is an important component of surgical treatment. It preserves segmental mobility and enhances spinal stability through non-fusion fixation. It offers a range of advantages over fusion surgery and is gaining increasing attention among clinicians. The basic principle of interspinous dynamic stabilizers is to widen the narrow spinal canal and increase the vertical diameter of the intervertebral foramen by distracting and fixing the spinous processes, thereby alleviating nerve root compression and alleviating symptoms.

[0004] In the prior art, a patent application with publication number CN201719361 U discloses a spinal non-fusion fixation device. The spinal non-fusion fixation device is made of a titanium alloy elastic material, and includes: an integrally formed U-shaped portion, and fixing portions located on both sides of the opening of the U-shaped portion. The fixing portion includes: a front fixation plate and a rear fixation plate. In addition, ratchets are provided on the opposite sides of the front fixation plate and the rear fixation plate, so as to achieve a better fixation effect on the spinal non-fusion fixation device. However, the fixing position of the intervertebral lamina stabilization mechanism in the above-mentioned prior art is the interspinous process space of the upper and lower vertebrae. The above-mentioned intervertebral lamina stabilization mechanism adopts the interspinous process fixation method. The contact area between the bone body and the instrument is small, its stability is insufficient, and complications such as displacement and spinous process fracture may occur, which seriously affect the prognosis of the operation. At the same time, the existing intervertebral lamina stabilization mechanism has poor intervertebral space expansion ability, cannot effectively retain the mobility and stability of the surgical segment, and also has the problem of high possibility of degeneration of adjacent segments.

[0005] Therefore, those skilled in the art need a new lamina non-fusion fixation device to increase the stability and mobility of the non-fusion fixation device and reduce the risk of complications. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is that the existing non-fusion fixation device for vertebral lamina cannot effectively maintain the range of motion and stability of the surgical segment, and the risk of complications is high. To this end, the present invention provides a non-fusion fixation device for vertebral lamina, comprising:

[0007] The vertebral plate fixing body is a U-shaped main body structure; the vertebral plate fixing body is adapted to the shape of the intervertebral plate space between the upper vertebral plate and the lower vertebral plate of the surgical segment and is arranged at the intervertebral plate space;

[0008] The upper support surface of the vertebral plate fixing body is also provided with an anti-posterior movement protrusion; the anti-posterior movement protrusion is a triangular structure and is adapted to the triangular three-dimensional spatial shape of the lower dome of the vertebral plate; the anti-posterior movement protrusion is in direct contact with the lower dome of the vertebral plate to prevent the fixing device from moving toward the vertebral body of the spine.

[0009] Optionally, the upper support surface of the lamina fixation body is adapted to and abuts against the lower edge of the spinous process of the upper lamina, and the lower support surface of the lamina fixation body is adapted to and abuts against the upper edge of the spinous process of the lower lamina to bear the posterior column load in the intervertebral space.

[0010] Optionally, the lamina fixation body includes: an upper supporting surface, a lower supporting surface, and a connecting surface connecting the upper supporting surface and the lower supporting surface;

[0011] The length of the upper supporting surface is not less than 8 mm, and the length of the lower supporting surface is not less than 12 mm; and the vertical distance between the upper supporting surface and the lower supporting surface is 6 mm-16 mm.

[0012] Optionally, the anti-posterior movement protrusion is located on the upper support surface, close to the connecting surface; and the anti-posterior movement protrusion abuts against the slope surface of the triangular three-dimensional space formed by the lower edge of the vertebral plate of the upper vertebral plate to prevent the vertebral plate non-fusion fixation device from moving toward the vertebral body.

[0013] Optionally, the anti-backward movement protrusion has a height of 2 mm to 8 mm, a width of 8 mm to 14 mm, and a bevel angle of 30° to 60°.

[0014] Optionally, the lower support surface is clamped and fixed at the upper articular process position of the lower vertebral plate.

[0015] Optionally, a fixing wing is further provided at the lower supporting surface of the lamina fixing body;

[0016] The fixing wing is located on the lower supporting surface and away from the connecting surface; and the fixing wing is clamped and connected to the spinous process of the lower vertebral plate to fix the vertebral plate non-fusion fixation device.

[0017] The technical solution of the present invention has the following advantages:

[0018] 1. The non-fusion fixation device for vertebral lamina provided by the present invention comprises:

[0019] The vertebral plate fixing body is a U-shaped main body structure; the vertebral plate fixing body is adapted to the shape of the intervertebral plate space between the upper vertebral plate and the lower vertebral plate of the surgical segment and is arranged at the intervertebral plate space;

[0020] The upper support surface of the vertebral plate fixing body is also provided with an anti-posterior movement protrusion; the anti-posterior movement protrusion is a triangular structure and is adapted to the triangular three-dimensional spatial shape of the lower dome of the vertebral plate; the anti-posterior movement protrusion is in direct contact with the lower dome of the vertebral plate to prevent the fixing device from moving toward the vertebral body of the spine.

[0021] In the present invention, the lamina fixing body is designed to be compatible with the shape of the interlamina space between the upper lamina and the lower lamina of the surgical segment. The upper supporting surface of the lamina fixing body is compatible with the shape of the upper lamina, and the lower supporting surface of the lamina fixing body is compatible with the shape of the lower lamina. The upper supporting surface and the lower supporting surface of the lamina fixing body can effectively bear the load of the posterior column in the intervertebral space. In posterior spinal non-fusion surgery, the interlamina non-fusion fixation device is installed in the interlamina space of adjacent vertebrae, and by expanding and fixing the interlamina space, the folded posterior longitudinal ligament and annulus fibrosus are stretched, thereby effectively achieving the following: reducing the degree of spinal canal stenosis, while increasing the upper and lower diameters of the intervertebral foramen in the same segment, expanding the cross-sectional area of the nerve root canal, and reducing the pressure on the nerve roots.

[0022] Moreover, in the present invention, the fixing position of the interlaminar stabilization mechanism is changed from the interspinous spaces between the upper and lower vertebral bodies to the interlaminar space between the upper and lower lamina. The above-mentioned structural arrangement not only enhances the stability of the spine at this segment, but also retains the spinal mobility of this segment. Furthermore, the interlaminar non-fusion fixation device is adapted to the shape of the interlaminar space, so that the upper support surface and the lower support surface of the interlaminar fixation body can be adapted to the shape of the lower edge of the spinous process of the upper lamina and the upper edge of the spinous process of the lower lamina, respectively. The above-mentioned structure can allow the interlaminar non-fusion fixation device located at the interlaminar space of adjacent vertebrae to have stronger structural stability, effectively reducing the risk of complications.

[0023] More importantly, the present invention also records that the upper support surface position of the vertebral plate fixation body is provided with an anti-posterior displacement protrusion. The anti-posterior displacement protrusion in the present invention is adapted to the triangular three-dimensional spatial shape of the lower dome position of the vertebral plate, and is directly in contact with and connected to the lower dome of the vertebral plate. The above-mentioned anti-posterior displacement protrusion abuts against the triangular slope structure at the lower dome position of the vertebral plate, which can effectively achieve the fixation of the non-fusion fixation device to the front position of the vertebral plate, thereby providing resistance to backward displacement for the fixation device. The above-mentioned structure can provide stability support for the non-fusion fixation device between vertebral plates and reduce the risk of device displacement.

[0024] 2. The non-fusion fixation device for vertebral lamina provided by the present invention comprises a vertebral lamina fixation body comprising: an upper supporting surface, a lower supporting surface, and a connecting surface connecting the upper supporting surface and the lower supporting surface; the length of the upper supporting surface is not less than 8 mm, and the length of the lower supporting surface is not less than 12 mm; and the vertical distance between the upper supporting surface and the lower supporting surface is 6 mm-16 mm.

[0025] In the present invention, by limiting the lengths of the upper and lower support surfaces of the non-fusion lamina fixation device and restricting the vertical distance between the upper and lower support surfaces, a non-fusion lamina fixation device within the aforementioned size range can effectively ensure the stability of the lamina fixation body at the spinal segment while preserving the spinal mobility of that segment.

[0026] 3. In the non-fusion lamina fixation device provided by the present invention, the anti-posterior movement projection is located on the upper support surface, near the connecting surface. Furthermore, the anti-posterior movement projection and the slope of the triangular space formed by the lower edge of the upper lamina abut against each other to prevent the non-fusion lamina fixation device from moving toward the vertebral body. Furthermore, the anti-posterior movement projection has a height of 2 mm to 8 mm, a width of 8 mm to 14 mm, and an angle of 30° to 60°.

[0027] The anti-posterior displacement protrusion in the above size range can be stably and reliably connected to the triangular slope structure at the lower dome of the vertebral plate, providing resistance to posterior displacement of the fixation device, providing stability support for the interlaminar non-fusion fixation device, and reducing the risk of displacement of the fixation device.

[0028] 4. In the non-fusion lamina fixation device provided by the present invention, the lower support surface is clamped and fixed to the superior articular process of the lower lamina. This clamping and fixing of the lower support surface of the non-fusion lamina fixation device to the superior articular process of the patient effectively ensures the structural stability of the non-fusion lamina fixation device while preserving spinal mobility.

[0029] 5. The non-fusion fixation device for the vertebral plate provided by the present invention is further provided with a fixing wing at the lower supporting surface position of the vertebral plate fixation body; the fixing wing is located on the lower supporting surface and away from the connecting surface; and the fixing wing is clamped and connected to the spinous process of the lower vertebral plate to fix the non-fusion fixation device for the vertebral plate.

[0030] In the present invention, a fixing wing is provided at the lower supporting surface of the lamina fixing body, and the fixing wing cooperates with the above-mentioned anti-backward displacement protrusion to effectively provide position support for the lamina fixing body, ensure its stability and reduce the risk of device displacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A schematic diagram of the three-dimensional structure of the non-fusion lamina fixation device with a posterior anti-migration protrusion provided by the present invention;

[0033] Figure 2 A schematic plan view of a non-fusion lamina fixation device with a protrusion to prevent posterior displacement provided by the present invention;

[0034] Figure 3 A schematic diagram of the triangular three-dimensional space where the anti-posterior displacement protrusion on the vertebral plate fixation body provided by the present invention abuts against the lower dome of the vertebral plate;

[0035] Figure 4 A side view of the triangular space formed by the position of the inferior dome of the vertebral plate provided by the present invention;

[0036] Figure 5 A top view of the triangular space formed by the position of the inferior dome of the vertebral plate provided by the present invention;

[0037] Figure 6 A schematic diagram of the three-dimensional structure of the vertebral plate fixation body provided by the present invention installed on the vertebral plate;

[0038] Figure 7 This is a schematic diagram of the vertebral plate structure provided by the present invention.

[0039] Description of reference numerals:

[0040] 1-vertebral lamina fixation body; 2-upper vertebral lamina; 3-lower vertebral lamina; 4-upper supporting surface; 5-lower supporting surface; 6-connecting surface; 7-anti-posterior displacement protrusion; 8-triangular three-dimensional space; 9-connecting surface; 10-fixation wing. DETAILED DESCRIPTION

[0041] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] Example 1

[0044] See Figure 1 The present invention is shown in the following figure, which is a schematic diagram of the three-dimensional structure of a non-fusion lamina fixation device with a protrusion to prevent posterior displacement. Figure 2 The diagram shows a plan view of a non-fusion lamina fixation device according to an embodiment of the present invention. The non-fusion lamina fixation device comprises:

[0045] The lamina fixing body 1 is a U-shaped main body structure; the lamina fixing body 1 is adapted to the shape of the interlaminar space between the upper lamina 2 and the lower lamina 3 of the surgical segment and is arranged at the interlaminar space. In this embodiment, the lamina fixing body 1 includes: an upper support surface 4, a lower support surface 5, and a connecting surface 9 connecting the upper support surface 4 and the lower support surface 5. Specifically, the upper support surface 4 of the lamina fixing body 1 is adapted to the shape of the lower edge of the spinous process of the upper lamina 2 and is abutted and connected, and the lower support surface 5 of the lamina fixing body 1 is adapted to the shape of the upper edge of the spinous process of the lower lamina 3 and is abutted and connected to bear the posterior column load in the intervertebral space. In addition, the lower support surface 5 of the lamina fixing body 1 is clamped and fixed at the upper articular process position of the lower lamina 3. In posterior spinal non-fusion surgery, the interlaminar non-fusion fixation device is installed in the interlaminar space of adjacent vertebrae. By expanding and fixing the interlaminar space and stretching the folded posterior longitudinal ligament and annulus fibrosus, it can effectively achieve the following: reduce the degree of spinal canal stenosis, increase the upper and lower diameters of the intervertebral foramen in the same segment, expand the cross-sectional area of the nerve root canal, and reduce nerve root compression;

[0046] Furthermore, in a specific embodiment, the length of the upper support surface 4 is no less than 8 mm, the length of the lower support surface 5 is no less than 12 mm, and the vertical distance between the upper support surface 4 and the lower support surface 5 is 6 mm to 16 mm. Non-fusion lamina fixation devices within this size range can effectively ensure the stability of the lamina fixation body at the spinal segment while maintaining spinal mobility in that segment.

[0047] See Figure 3 The figure shows a schematic diagram of the abutment between the anti-posterior displacement protrusion on the lamina fixation body and the triangular three-dimensional space at the lower dome of the lamina in an embodiment of the present invention. Figure 4 The side view of the triangular space formed by the position of the inferior dome of the lamina in the embodiment of the present invention is shown. And, Figure 5 The embodiment of the present invention shown in the figure is a top view of a triangular space formed at the inferior dome of the vertebral plate.

[0048] The vertebral plate non-fusion fixation device also includes: an anti-posterior displacement protrusion 7, which is arranged at the position of the upper support surface 4 of the vertebral plate fixation body 1. The anti-posterior displacement protrusion 7 is a triangular structure and is adapted to the shape of the triangular three-dimensional space 8; the anti-posterior displacement protrusion 7 is in direct contact with the lower dome of the vertebral plate to prevent the fixation device from moving toward the vertebral body of the spine. Specifically, the anti-posterior displacement protrusion 7 is located on the upper support surface 4 and close to the connecting surface 9; and the anti-posterior displacement protrusion 7 is in contact with the slope of the triangular three-dimensional space 8 formed by the lower edge of the vertebral plate of the upper vertebral plate 2 to prevent the non-fusion vertebral plate fixation device from moving toward the vertebral body.

[0049] Furthermore, in a specific embodiment, the anti-posterior movement protrusion 7 has a height of 2 mm to 8 mm, a width of 8 mm to 14 mm, and a slope angle of 30° to 60°. The anti-posterior movement protrusion 7 within the above size range can stably and reliably abut and connect with the triangular slope structure at the lower dome of the vertebral lamina.

[0050] See Figure 6 The embodiment of the present invention is shown in the three-dimensional structural diagram of the vertebral plate fixing body installed on the vertebral plate. And, Figure 7 A schematic diagram of the vertebral lamina structure in an embodiment of the present invention is shown. The non-fusion vertebral lamina fixation device further includes a fixing wing 10. The lower support surface 5 is clamped and fixed to the superior articular process of the lower vertebral lamina 3 via the fixing wing 10. Specifically, the fixing wing 10 is located on the lower support surface 5, away from the connecting surface 9; and the fixing wing 10 is clamped and connected to the spinous process of the lower vertebral lamina 3 to secure the non-fusion vertebral lamina fixation device.

[0051] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A non-fusion fixation device for vertebral plates, characterized in that: include: A vertebral plate fixing body (1), wherein the vertebral plate fixing body (1) is a U-shaped main body structure; The vertebral plate fixing body (1) is adapted to the shape of the intervertebral plate space between the upper vertebral plate (2) and the lower vertebral plate (3) of the surgical segment and is arranged at the intervertebral plate space; The upper support surface (4) of the vertebral plate fixing body (1) is also provided with an anti-backward movement protrusion (7); the anti-backward movement protrusion (7) is a triangular structure and is adapted to the shape of the triangular three-dimensional space (8) at the position of the lower dome of the vertebral plate; the anti-backward movement protrusion (7) is in direct contact with the lower dome of the vertebral plate to prevent the fixing device from moving toward the vertebral body of the spine.

2. The lamina non-fusion fixation device according to claim 1, characterized in that: The upper support surface (4) of the vertebral plate fixing body (1) is adapted to the shape of the lower edge of the spinous process of the upper vertebral plate (2) and is abutted and connected, and the lower support surface (5) of the vertebral plate fixing body (1) is adapted to the shape of the upper edge of the spinous process of the lower vertebral plate (3) and is abutted and connected to bear the posterior column load in the intervertebral space.

3. The vertebral plate non-fusion fixation device according to claim 1, characterized in that: The vertebral plate fixing body (1) comprises: an upper supporting surface (4), a lower supporting surface (5), and a connecting surface (9) connecting the upper supporting surface (4) and the lower supporting surface (5); The length of the upper supporting surface (4) is not less than 8 mm, and the length of the lower supporting surface (5) is not less than 12 mm; and the vertical distance between the upper supporting surface (4) and the lower supporting surface (5) is 6 mm to 16 mm.

4. The vertebral plate non-fusion fixation device according to claim 3, characterized in that: The anti-posterior movement protrusion (7) is located on the upper support surface (4) and close to the connecting surface (9); and the anti-posterior movement protrusion (7) and the triangular three-dimensional space (8) formed by the lower edge of the vertebral plate (2) are in contact with each other with their sloped surfaces to prevent the vertebral plate non-fusion fixation device from moving toward the vertebral body.

5. The lamina non-fusion fixation device according to claim 1, characterized in that: The anti-backward movement protrusion (7) has a height of 2 mm to 8 mm, a width of 8 mm to 14 mm, and a slope angle of 30° to 60°.

6. The lamina non-fusion fixation device according to claim 2, characterized in that: The lower support surface (5) is clamped and fixed at the upper articular process position of the lower vertebral plate (3).

7. The lamina non-fusion fixation device according to claim 6, characterized in that: A fixing wing (10) is further provided at the lower supporting surface (5) of the vertebral plate fixing body (1); The fixing wing (10) is located on the lower supporting surface (5) and away from the connecting surface (9); and the fixing wing (10) is clamped and connected to the spinous process of the lower vertebral plate (3) to fix the vertebral plate non-fusion fixation device.

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