A non-fusion lamina fixation device

Abstract

The present invention relates to the field of medical device technology, and specifically to a non-fusion vertebral plate fixation device, comprising: a vertebral plate fixation body, the vertebral plate fixation body is a U-shaped main body structure; the vertebral plate fixation body is located in the intervertebral plate position between the upper vertebral plate and the lower vertebral plate of the surgical segment, and the upper support surface of the vertebral plate fixation body is connected to the upper vertebral plate in abutment with the upper vertebral plate, and the lower support surface of the vertebral plate fixation body is connected to the lower vertebral plate in abutment with the lower vertebral plate to bear the posterior column load in the intervertebral plate. The vertebral plate fixation device provided by the present invention has a vertebral plate fixation body adapted to be installed in the intervertebral plate position of the adjacent vertebral body during the non-fusion surgery of the posterior spinal approach, and by opening and fixing the intervertebral plate space, the folded posterior longitudinal ligament and annulus fibrosus are stretched, thereby reducing the degree of spinal canal stenosis, while increasing the upper and lower diameters of the intervertebral foramen of the same segment, expanding the cross-sectional area of ​​the nerve root canal, and reducing the compression of the nerve root. The above-mentioned fixation device can also enhance the stability of the spine at the segment while retaining the spinal mobility of the segment.

Description

Technical Field

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

[0002] Lumbar degenerative disease is a disease caused by degenerative changes in the vertebral bodies, intervertebral discs, and other structures around the spine, which usually develops with age. Such diseases may lead to reduced disc height, spinal stenosis, spinal instability, and ultimately pain and neurological damage. These symptoms are usually progressive and have a negative impact on daily life and work. Current treatments for lumbar degenerative disease include conservative treatment or surgical treatment. Conservative treatment aims to relieve symptoms and improve quality of life; surgical treatment usually includes fusion surgery and non-fusion surgery to restore normal disc height, stabilize the spine, relieve nerve compression and relieve symptoms.

[0003] Spinal non-fusion technology is an important part of surgical treatment. It preserves the range of motion of the surgical segment and enhances spinal stability through non-fusion fixation. It has a series of advantages that fusion surgery does not have and is increasingly valued by clinical physicians. The basic principle of the interspinous dynamic stabilizer is to expand the narrow spinal canal and increase the upper and lower diameters of the intervertebral foramen by distracting and fixing the spinous processes, thereby reducing nerve root compression and relieving symptoms.

[0004] However, for example, the intervertebral stabilization mechanism disclosed in the publication number is CN115581545A. The fixing position of the above intervertebral stabilization mechanism is the interspinous process space of the upper and lower vertebrae. The above intervertebral stabilization mechanism adopts the interspinous process space fixation method, and 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 affects the prognosis of the operation. Moreover, the intervertebral space expansion ability of the existing intervertebral stabilization mechanism is poor, and it is impossible to effectively retain the mobility and stability of the surgical segment, and the possibility of adjacent segment degeneration is high.

[0005] Therefore, those skilled in the art need a new non-fusion lamina 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] The present invention provides a vertebral plate non-fusion fixation device, 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 gap between the upper vertebral plate and the lower vertebral plate of the surgical segment, and is arranged at the intervertebral plate gap position; and the upper supporting surface of the vertebral plate fixing body is adapted to and abutted with the shape of the upper vertebral plate, and the lower supporting surface of the vertebral plate fixing body is adapted to and abutted with the shape of the lower vertebral plate, so as to bear the posterior column load in the intervertebral plate gap.

[0008] Optionally, the upper supporting surface, the lower supporting surface, and a connecting surface connecting the upper supporting surface and the lower supporting surface constitute the lamina fixation body.

[0009] Optionally, the lower supporting surface is clamped and fixed at the upper articular process position of the lower vertebral plate.

[0010] Optionally, an anti-backward movement protrusion is further provided at the upper support surface of the lamina fixing body;

[0011] The anti-backward movement protrusion is located near the connecting surface and abuts against the lower edge of the vertebral plate of the upper vertebral plate to prevent the vertebral plate non-fusion fixing device from moving toward the vertebral body.

[0012] Optionally, a fixing wing is further provided at the lower supporting surface of the lamina fixing body;

[0013] The fixing wing is located away from the connecting surface and is clamped and connected with the spinous process of the lower lamina to fix the lamina non-fusion fixing device.

[0014] Optionally, the length of the upper support surface is not less than 8 mm, and the length of the lower support surface is not less than 12 mm;

[0015] Furthermore, a vertical distance between the upper supporting surface and the lower supporting surface is 6 mm to 16 mm.

[0016] The technical solution of the present invention has the following advantages:

[0017] 1. The non-fusion vertebral plate fixation device provided by the present invention comprises: a vertebral plate fixation body, which is a U-shaped main body structure; the vertebral plate fixation body is adapted to the shape of the vertebral plate gap between the upper vertebral plate and the lower vertebral plate of the surgical segment, and is arranged at the vertebral plate gap position; and the upper supporting surface of the vertebral plate fixation body is adapted to and abutted with the shape of the upper vertebral plate, and the lower supporting surface of the vertebral plate fixation body is adapted to and abutted with the shape of the lower vertebral plate, so as to bear the posterior column load in the intervertebral plate.

[0018] In the present invention, the lamina fixing body is designed to be a shape that matches the shape of the interlaminar space between the upper lamina and the lower lamina of the surgical segment. In addition, the upper support surface of the lamina fixing body matches the shape of the upper lamina, and the lower support surface of the lamina fixing body matches the shape of the lower lamina. The upper support surface and the lower support surface of the lamina fixing body can effectively carry the posterior column load in the intervertebral space. In the posterior non-fusion surgery of the spine, the interlaminar non-fusion fixing device is installed at the interlaminar space of the adjacent vertebral body, and the folded posterior longitudinal ligament and annulus fibrosus are stretched by opening and fixing the interlaminar space, thereby reducing the degree of spinal canal stenosis, and at the same time increasing the upper and lower diameters of the intervertebral foramen of the same segment, expanding the cross-sectional area of ​​the nerve root canal, and reducing the compression of the nerve root. More importantly, the lamina fixing body not only enhances the stability of the spine at the segment, but also retains the spinal mobility of the segment. In addition, since the shape of the vertebral plate fixing body is adapted to the intervertebral plate space, and the upper supporting surface and the lower supporting surface of the vertebral plate fixing body are adapted to the shapes of the upper vertebral plate and the lower vertebral plate respectively, the non-fusion vertebral plate fixing device located at the intervertebral plate space of adjacent vertebrae has stronger structural stability and effectively reduces the risk of complications.

[0019] 2. The non-fusion vertebral plate fixation device provided by the present invention has a lower support surface clamped and fixed to the upper articular process of the lower vertebral plate. The lower support surface is clamped and fixed to the upper articular process, which can effectively ensure the structural stability of the non-fusion vertebral plate fixation device while retaining the range of motion of the spine.

[0020] 3. The non-fusion vertebral plate fixation device provided by the present invention is further provided with an anti-posterior movement protrusion at the upper supporting surface of the vertebral plate fixation body; the anti-posterior movement protrusion is located close to the connecting surface and abuts against the lower edge of the vertebral plate of the upper vertebral plate to prevent the non-fusion vertebral plate fixation device from moving toward the vertebral body.

[0021] In the present invention, by providing the anti-posterior displacement protrusion above the front of the interlaminar non-fusion fixation device, the position of the non-fusion fixation device and the front of the lamina can be fixed, thereby providing resistance to the backward displacement of the fixation device. The above structure can provide stability support for the interlaminar non-fusion fixation device and reduce the risk of device displacement.

[0022] 4. The non-fusion vertebral plate fixation device provided by the present invention is further provided with a fixing wing at the lower supporting surface of the vertebral plate fixation body; the fixing wing is located away from the connecting surface and is clamped and connected with the spinous process of the lower vertebral plate to fix the non-fusion vertebral plate fixation device.

[0023] In the present invention, the fixing wings arranged on the lower supporting surface of the lamina fixing body cooperate with the anti-rearward displacement protrusions to effectively provide position support for the lamina fixing body, ensure its stability and reduce the risk of device displacement.

[0024] 5. In the non-fusion vertebral plate fixation device provided by the present invention, 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 length dimensions of the upper support surface and the lower support surface of the non-fusion vertebral plate fixation device, and limiting the vertical distance dimension between the upper support surface and the lower support surface, the non-fusion vertebral plate fixation device within the above-mentioned size range can effectively ensure the stability of the vertebral plate fixation body at the segment of the spine, while retaining the spinal mobility of the segment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic plan view of the connection structure of the non-fusion lamina fixation device with a posterior displacement prevention protrusion provided by the present invention and the upper lamina and the lower lamina;

[0028] Figure 2 A side view of a non-fusion lamina fixation device with a protrusion to prevent posterior displacement provided by the present invention;

[0029] Figure 3 A three-dimensional schematic diagram of the connection structure between the vertebral plate non-fusion fixation device and the vertebral plate provided by the present invention;

[0030] Figure 4 A three-dimensional schematic diagram of the connection structure between the vertebral plate non-fusion fixation device with a posterior displacement prevention protrusion and the vertebral plate provided by the present invention;

[0031] Figure 5 This is a schematic diagram of the vertebral plate structure provided by the present invention.

[0032] Description of reference numerals:

[0033] 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-fixing wing. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] Example 1

[0037] See also Figure 1 , Figure 4 and Figure 5 , Figure 1 A schematic plan view of the connection structure between the non-fusion lamina fixation device with the anti-posterior displacement protrusion and the upper lamina and the lower lamina in the embodiment of the present invention is shown; Figure 4 A three-dimensional schematic diagram of the connection structure between the vertebral plate non-fusion fixation device with the anti-posterior displacement protrusion and the vertebral plate in the embodiment of the present invention is shown; Figure 5 This is a schematic diagram of the vertebral plate structure provided by the present invention.

[0038] Non-fusion laminar fixation device, including:

[0039] The lamina fixing body 1 is a U-shaped main body structure, and the lamina fixing body 1 is formed by an upper supporting surface 4, a lower supporting surface 5, and a connecting surface 6 connecting the upper supporting surface 4 and the lower supporting surface 5. The lower supporting surface 5 is clamped and fixed at the upper articular process position of the lower lamina 3. 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 position; and the upper supporting surface 4 of the lamina fixing body 1 is adapted to the shape of the upper lamina 2 and is connected in abutment, and the lower supporting surface 5 of the lamina fixing body 1 is adapted to the shape of the lower lamina 3 and is connected in abutment to bear the posterior column load in the intervertebral space. In the present invention, the posterior column load in the intervertebral space can be effectively borne by the upper supporting surface 4 and the lower supporting surface 5 of the lamina fixing body 1. In the non-fusion surgery of the posterior spinal approach, the above-mentioned interlaminar non-fusion fixation device is installed in the interlaminar space of the adjacent vertebral bodies, and by expanding and fixing the interlaminar space, stretching the folded posterior longitudinal ligament and annulus fibrosus, the degree of spinal canal stenosis is reduced, and at the same time, the upper and lower diameters of the intervertebral foramen in the same segment are increased, the cross-sectional area of ​​the nerve root canal is expanded, and the compression of the nerve root is reduced. Moreover, more importantly, the above-mentioned lamina fixation body 1 not only enhances the stability of the spine at the segment, but also retains the spinal mobility of the segment.

[0040] In the present invention, in order to provide position support for the vertebral plate fixation body 1, the vertebral plate non-fusion fixation device is blocked from moving toward the vertebral body, thereby ensuring the stability of the vertebral plate non-fusion fixation device and reducing the risk of displacement. Figures 1 to 3 As shown, the upper support surface 4 of the lamina fixing body 1 is also provided with an anti-backward movement protrusion 7; the anti-backward movement protrusion 7 is located near the connecting surface 6 and abuts against the lower edge of the lamina of the upper lamina 2 to prevent the lamina non-fusion fixing device from moving toward the vertebral body. At the same time, the lower support surface 5 of the lamina fixing body 1 is also provided with a fixing wing 8; the fixing wing 8 is located away from the connecting surface 6 and is clamped and connected with the spinous process of the lower lamina 3 to fix the lamina non-fusion fixing device.

[0041] In the present invention, in order to ensure the installation stability of the vertebral plate non-fusion fixation device and retain the segmental spinal mobility of the fixation device, the size of the vertebral plate non-fusion fixation device is limited. The length of the upper support surface 4 is 9 mm, the length of the lower support surface 5 is 12.5 mm; and the vertical distance between the upper support surface 4 and the lower support surface 5 is 8 mm.

[0042] Of course, this embodiment does not specifically limit the specific size data of the vertebral plate non-fusion fixation device. In other embodiments, the length of the upper support surface 4 is 8 mm, the length of the lower support surface 5 is 12 mm; and the vertical distance between the upper support surface 4 and the lower support surface 5 is 6 mm. Of course, the length of the upper support surface 4 can also be 10 mm, the length of the lower support surface 5 can also be 15 mm; and the vertical distance between the upper support surface 4 and the lower support surface 5 can also be 16 mm.

[0043] Example 2

[0044] See also Figure 3 , Figure 3 The figure shows a three-dimensional schematic diagram of the connection structure between the vertebral plate and the vertebral plate of the non-fusion fixation device of the embodiment of the present invention which does not have the anti-posterior displacement protrusion of the above-mentioned embodiment 1.

[0045] Non-fusion laminar fixation device, including:

[0046] The lamina fixing body 1 is a U-shaped main body structure, and the lamina fixing body 1 is formed by an upper supporting surface 4, a lower supporting surface 5, and a connecting surface 6 connecting the upper supporting surface 4 and the lower supporting surface 5. The lower supporting surface 5 is clamped and fixed at the upper articular process position of the lower lamina 3. 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 position; and the upper supporting surface 4 of the lamina fixing body 1 is adapted to the shape of the upper lamina 2 and is connected in abutment, and the lower supporting surface 5 of the lamina fixing body 1 is adapted to the shape of the lower lamina 3 and is connected in abutment to bear the posterior column load in the intervertebral space. In the present invention, the posterior column load in the intervertebral space can be effectively borne by the upper supporting surface 4 and the lower supporting surface 5 of the lamina fixing body 1. In the non-fusion surgery of the posterior spinal approach, the above-mentioned interlaminar non-fusion fixation device is installed in the interlaminar space of the adjacent vertebral bodies, and by expanding and fixing the interlaminar space, stretching the folded posterior longitudinal ligament and annulus fibrosus, the degree of spinal canal stenosis is reduced, and at the same time, the upper and lower diameters of the intervertebral foramen in the same segment are increased, the cross-sectional area of ​​the nerve root canal is expanded, and the compression of the nerve root is reduced. Moreover, more importantly, the above-mentioned lamina fixation body 1 not only enhances the stability of the spine at the segment, but also retains the spinal mobility of the segment.

[0047] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A non-fusion lamina fixation device, characterized in that: include: A vertebral plate fixing body (1), wherein the vertebral plate fixing body (1) is a U-shaped body structure; The vertebral plate fixing body (1) is adapted to the shape of the intervertebral plate gap between the upper vertebral plate (2) and the lower vertebral plate (3) of the surgical segment, and is arranged at the intervertebral plate gap; and the upper support surface (4) of the vertebral plate fixing body (1) is adapted to the shape 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 lower vertebral plate (3) and is abutted and connected, so as to bear the posterior column load in the intervertebral plate gap; The upper support surface (4) of the vertebral plate fixing body (1) is also provided with an anti-backward movement protrusion (7); The anti-posterior movement protrusion (7) is located close to the connecting surface (6) and abuts against the lower edge of the vertebral plate of the upper vertebral plate (2) to prevent the vertebral plate non-fusion fixation device from moving toward the vertebral body.

2. The non-fusion fixation device for vertebral lamina according to claim 1, characterized in that: The upper supporting surface (4), the lower supporting surface (5), and a connecting surface (6) connecting the upper supporting surface (4) and the lower supporting surface (5) constitute the vertebral plate fixing body (1).

3. The non-fusion fixation device for vertebral lamina 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).

4. The non-fusion fixation device for vertebral lamina according to claim 2, characterized in that: A fixing wing (8) is also provided at the lower supporting surface (5) of the vertebral plate fixing body (1); The fixing wing (8) is located away from the connecting surface (6) and is clamped and connected with the spinous process of the lower vertebral plate (3) to fix the vertebral plate non-fusion fixing device.

5. The non-fusion fixation device for vertebral lamina according to claim 1, characterized in that: The length of the upper support surface (4) is not less than 8 mm, and the length of the lower support surface (5) is not less than 12 mm; Furthermore, the vertical distance between the upper supporting surface (4) and the lower supporting surface (5) is 6 mm to 16 mm.

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