Lumbar interbody fusion fixation device

Abstract

The present invention provides a lumbar intervertebral fusion fixation device, comprising: a vertebral plate, the vertebral plate having two first fastening holes respectively located at both ends and a second fastening hole located in the center, the vertebral plate being fixed to the lumbar vertebral body by inserting a first fastener into the first fastening hole and fastening; and a fusion device, the end of the fusion device connected to the vertebral plate having a connecting hole, the fusion device being fixedly connected to the vertebral plate by inserting a second fastener into the second fastening hole into the connecting hole. The lumbar intervertebral fusion fixation device according to the present invention adopts a fusion and fixation integrated device to fix the fusion device to the vertebral plate, thereby avoiding complications caused by displacement of the fusion device.

Description

Technical Field

[0001] The present invention relates to the field of medical devices and more specifically to a lumbar intervertebral fusion fixation device for oblique lateral lumbar intervertebral fusion. Background Art

[0002] Lateral oblique lumbar interbody fusion (OLIF) is a minimally invasive interbody fusion technique that has developed rapidly in recent years. It is mainly suitable for single-segment or multi-segment degenerative diseases, deformities, trauma, and postoperative revisions of the lumbar spine that require anterior spinal decompression and fusion. OLIF surgery has the advantages of simple operation, less trauma, and quick recovery. Therefore, it has been highly praised in recent years, but it still has some complications that cannot be ignored. Among them, interbody fusion cage (Cage) displacement is one of the more common complications. Cage displacement can compress or damage adjacent tissues. The currently recognized treatment countermeasures are: forward displacement compresses large blood vessels, and the blood vessels need to be retracted to remove the Cage. Backward displacement into the spinal canal or posterior to the side will compress the spinal cord or nerve roots, requiring PLIF adjustment and decompression. It can be seen that Cage displacement requires secondary surgery to remove or adjust, which increases the pain of patients and increases costs.

[0003] At present, OLIF surgery is widely used, mainly by removing the protruding disc, implanting a cage loaded with fresh bone graft, and using vertebral plates to fix adjacent vertebrae. However, this method will inevitably cause the complication of cage displacement:

[0004] The cage and vertebral plate currently used in the market are independent of each other and there is no connection between the two, so the cage is prone to displacement. Especially due to the uneven level of surgeons, if the trial model is not accurate enough, the cage is prone to displacement, resulting in non-fusion of the bone graft, and causing serious complications such as damage to nerves and blood vessels. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a lumbar intervertebral fusion fixation device which can be connected and fixed with a vertebral body steel plate and reduce the displacement of the fusion cage during OL IF surgery.

[0006] The lumbar intervertebral fusion fixation device according to the present invention comprises: a vertebral steel plate, the vertebral steel plate having two first fastening holes respectively located at the two ends of the vertebral steel plate and a second fastening hole located in the center, the vertebral steel plate is fixed to the lumbar vertebral body by inserting a first fastener into the first fastening hole and fastening it; and a fusion device, the end of the fusion device connected to the vertebral steel plate has a connecting hole, and the fusion device is fixedly connected to the vertebral steel plate by inserting a second fastener into the second fastening hole into the connecting hole.

[0007] Further, the fusion device may include: a fusion device body, which has an approximately rectangular shape and a front end as an implantation end, a rear end of the fusion device body is formed with a plurality of recesses for accommodating a support member, a bone grafting window is formed in the center of the fusion device body, and anti-slip teeth are respectively provided on the upper surface and the lower surface along the length direction of the fusion device body; and a fixing portion, a plurality of ball-and-socket-shaped grooves are formed at the front end of the fixing portion, one end of the support member is fixed in the recess, and the other end having a spherical shape is placed in the ball-and-socket-shaped groove, thereby connecting the fusion device body and the fixing portion and enabling the fixed portion to move relative to the fusion device body, and a connecting hole is formed at the rear end of the fixing portion.

[0008] Optionally, the rear end of the fixing portion may be formed with fixing clip grooves on both sides, respectively, for connecting the implanter and removing the implanter after the fusion device is implanted.

[0009] According to one embodiment of the present invention, the front end of the fusion device body may have a convex corner portion.

[0010] Optionally, the first fastener and the second fastener may be screws.

[0011] Preferably, the cage body may be made of polyetheretherketone.

[0012] In addition, preferably, the vertebral body plate may be made of titanium alloy.

[0013] The lumbar intervertebral fusion fixation device according to the present invention adopts a fusion and fixation integrated device to fix the fusion device to the vertebral body steel plate, thereby avoiding complications caused by displacement of the fusion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and other aspects and features of the present invention will become apparent from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0015] Figure 1 is a three-dimensional schematic diagram showing the structure of a fusion device of a lumbar intervertebral fusion fixation device according to an embodiment of the present invention;

[0016] Figure 2 yes Figure 1 A side view of the fusion device shown in;

[0017] Figure 3 is a schematic structural diagram of a vertebral body steel plate according to an embodiment of the present invention; and

[0018] Figure 4 1 is a schematic diagram of assembling components of a lumbar intervertebral fusion fixation device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The illustrative, non-limiting embodiments of the present invention are described in detail below with reference to the accompanying drawings to further illustrate the lumbar intervertebral fusion fixation device according to the present invention.

[0020] The following will refer to Figure 1-4 The lumbar intervertebral fusion fixation device according to the present invention is exemplarily described. Specifically, the lumbar intervertebral fusion fixation device includes a fusion device 1 and a vertebral plate 2. The vertebral plate 2 has two first fastening holes 21 located at both ends and a second fastening hole 22 located in the center. The vertebral plate is fixed to the lumbar vertebral body by inserting a first fastener (not shown in the figure) into the first fastening hole 21 and fastening it. The end of the fusion device 1 connected to the vertebral plate 2 has a connecting hole 18, and a second fastener (e.g., Figure 4 The second fastener 3) shown in the figure is inserted into the second fastening hole 22 into the connecting hole 18 to fix the fusion device and the vertebral plate. In this way, after the fusion device and the vertebral plate are implanted, since the vertebral plate is fixed to the lumbar vertebral body and the fusion device is fixedly connected to the vertebral plate, the fusion device can be prevented from being displaced, thereby reducing the incidence of complications caused by the displacement of the fusion device, so that the patient can avoid the risk of a second operation due to the complication.

[0021] Figure 4 The assembly diagram of the components of the lumbar intervertebral fusion fixation device according to the present invention is shown. In OL IF surgery, after the fusion device is implanted, the vertebral plate is implanted. Next, the second fastener is first inserted into the second fastening hole to the connection hole of the fusion device to preliminarily fix the fusion device. Then, after the vertebral plate is fixed to the vertebral body by inserting the first fastener into the first fastening hole, the second fastener is tightened to fix the fusion device to the vertebral plate.

[0022] Further, according to an exemplary embodiment of the present invention, the fusion device 1 may include a fusion device body 11 and a fixing portion 12, such as Figure 1 As shown in . The fusion device body 11 has an approximately rectangular parallelepiped shape and the front end is an implantation end, which is used as a bone grafting cage, and the interior can accommodate bone grafting to achieve intervertebral fusion. The rear end of the fusion device body is formed with a plurality of recesses 13 for accommodating support members 14. A bone grafting window 15 is formed in the center of the fusion device body 11 to facilitate postoperative fusion growth. In addition, the fusion device body 11 is provided with anti-slip teeth 16 on the upper and lower surfaces along the length direction of the fusion device body, for example, the anti-slip teeth 16 can have an inverted tooth shape (such as Figure 2), thereby increasing resistance to reduce slippage of the fusion device. A plurality of spherical and socket-shaped grooves 17 are formed at the front end of the fixing portion 12, one end of the support member 14 is fixed in the corresponding recess 13, and the other end having a spherical shape is placed in the corresponding spherical and socket-shaped groove 17, thereby connecting the fusion device body 11 and the fixing portion 12. Since the spherical end of the support member is accommodated in the spherical and socket-shaped groove and is rotatable, the fixing portion 12 can move relative to the fusion device body 11. In other words, the fixing portion 12 can be fine-tuned in position relative to the fusion device body 11 in multiple dimensions, thereby significantly reducing the difficulty of the operation and facilitating the operator's operation. In addition, a connecting hole 18 can be formed in the center of the rear end of the fixing portion 12.

[0023] According to one embodiment of the present invention, the rear end of the fixing portion 12 may be formed with fixing clip grooves 120 on both sides, respectively, for connecting the implanter during surgery and removing the implanter after the fusion device is implanted.

[0024] Preferably, the front end of the fusion device body 11 may have a convex corner portion 110 to help restore the physiological flexion of the spine. Optionally, the first fastener and the second fastener may be screws, such as Figure 4 The screw 3 shown in . Further preferably, the fusion device body can be made of polyetheretherketone. According to one example, the vertebral plate can be made of titanium alloy. However, those skilled in the art will understand that the first fastener and the second fastener are not limited thereto, but can adopt any fastening structure commonly used in the art, and the materials of the fusion device body and the vertebral plate are not limited thereto, but can adopt any material commonly used in the art.

[0025] Although exemplary embodiments of the present invention have been described, it is apparent to those skilled in the art that changes may be made to the embodiments without departing from the spirit and principles of the present invention, the scope of which is defined in the claims and their equivalents.

Claims

1. A lumbar intervertebral fusion fixation device, comprising: A vertebral body plate having two first fastening holes respectively located at both ends of the vertebral body plate and a second fastening hole located in the center, wherein the vertebral body plate is fixed to a lumbar vertebral body by inserting a first fastener into the first fastening hole and fastening the first fastening member; and A fusion device, wherein an end of the fusion device connected to the vertebral steel plate has a connection hole, and the fusion device is fixedly connected to the vertebral steel plate by inserting a second fastener into the second fastening hole and into the connection hole; The fusion device further comprises: A fusion device body, wherein the fusion device body has an approximately rectangular parallelepiped shape and the front end is an implantation end, a plurality of recesses are formed at the rear end of the fusion device body for accommodating the support member, a bone grafting window is formed in the center of the fusion device body, and anti-slip teeth are respectively provided on the upper surface and the lower surface along the length direction of the fusion device body; and A fixing part, wherein a plurality of ball-and-socket-shaped grooves are formed at the front end of the fixing part, one end of the support member is fixed in the groove, and the other end having a spherical shape is placed in the ball-and-socket-shaped groove, thereby connecting the fusion device body and the fixing part and enabling the fixing part to move relative to the fusion device body, and the connecting hole is formed at the rear end of the fixing part; The rear end of the fixing part is formed with fixing clip grooves on both sides, respectively, for connecting the implanter and removing the implanter after the fusion device is implanted; The front end of the fusion device body has a convex corner portion.

2. The lumbar intervertebral fusion fixation device according to claim 1, wherein: The first fastener and the second fastener are screws.

3. The lumbar intervertebral fusion fixation device according to claim 1, wherein: The fusion device body is made of polyetheretherketone.

4. The lumbar intervertebral fusion fixation device according to claim 1, wherein: The vertebral body steel plate is made of titanium alloy.

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