Lumbar posterior lateral fusion cage

Abstract

The utility model belongs to the field of medical instruments for lumbar intervertebral fusion in the spine orthopedics department, and particularly relates to a lumbar posterior lateral fusion cage. Comprising connecting plates and a cage body, the side of the cage body is open, the side wall of the cage body is in a sheet shape, the end of the cage body is in a U shape, through holes are evenly distributed in the side wall of the cage body, the connecting plates are arranged at the top end and the bottom end of the cage body, and connecting mechanisms are arranged on the connecting plates. The U-shaped cage body is of a three-dimensional hollow structure, autologous bones can be filled in the operation, a space is formed between an upper vertebral body and a lower vertebral body which are adjacent to each other in a fixing mode, therefore, the bone grafting cage is prevented from extruding deep nerves by bone grafting blocks, and high safety is achieved. The through hole is formed in the side wall of the cage body, blood supply in the vertebral fusion process is facilitated, and the vertebral fusion speed is increased.

Description

Technical Field

[0001] The utility model belongs to the field of medical instruments for lumbar fusion in spinal orthopedics, in particular to a posterolateral lumbar fusion device. Background Art

[0002] With the accelerated pace of life and the aging trend of society, more and more people are suffering from spinal diseases, especially lumbar spondylosis, which is gradually increasing and has a trend of younger people. Lumbar degenerative diseases mainly include degenerative lumbar disc disease, degenerative lumbar spinal stenosis, degenerative lumbar scoliosis and degenerative lumbar spondylolisthesis, which can easily cause stubborn back pain and radiating pain in the lower limbs, thus reducing the quality of life of patients. The non-surgical treatment of lumbar degenerative diseases is often not ideal, so most patients often need to stabilize the diseased segment of the spine through spinal canal decompression, fixation, fusion and other technical means.

[0003] Lumbar fusion is a basic technique for treating lumbar spine diseases. For patients with mild disc degeneration and simple spinal canal stenosis, spinal canal decompression and posterolateral fusion can be performed. Compared with intervertebral fusion, posterolateral fusion can preserve the intervertebral disc and part of the articular process joint, maintain lumbar stability to the greatest extent, cause less trauma, and reduce the risk of nerve damage.

[0004] However, in actual posterolateral fusion surgery, due to the narrow intervertebral space and limited bone graft area, how to improve the fixation between the bone graft bed and the transplanted bone and thus improve the fusion success rate is also a key issue worthy of consideration by the industry. There is an urgent need for a posterolateral lumbar fusion device that can provide more reliable fixation, facilitate surgical operation, and improve the bone fusion rate. Summary of the invention

[0005] The utility model provides a posterolateral lumbar fusion device, which has more reliable fixing performance, is easier to operate during surgery, and can expand the bone grafting bed and the transplanted bone area.

[0006] The utility model solves the above technical problems through the following technical solutions:

[0007] A lumbar posterolateral fusion device comprises a connecting plate and a cage body, wherein the side of the cage body is open, the side wall of the cage body is sheet-shaped, the end of the cage body is U-shaped, the side wall of the cage body is evenly distributed with through holes, the top and bottom ends of the cage body are provided with connecting plates, and the connecting plates are provided with connecting mechanisms.

[0008] The above-mentioned posterolateral lumbar fusion cage has two connecting plates, which are respectively arranged at the top and bottom ends of the same side of the cage body.

[0009] The above-mentioned posterolateral lumbar fusion device, the connecting mechanism includes a screw and a screw positioning hole, the screw positioning hole is arranged at the end of the connecting plate, and the screw passes through the screw hole to fix the connecting plate on the bone.

[0010] The cage of the above-mentioned posterolateral lumbar fusion device is made of titanium metal.

[0011] Compared with the prior art, the U-shaped cage of the utility model is a three-dimensional hollow structure, which can be filled with autologous bone during surgery, and the medial bone graft is in full contact with the isthmus and the outer side of the articular process, and the upper and lower bone blocks are in contact with the lower and upper edges of the upper and lower transverse processes, which helps to fuse the upper and lower transverse processes, the space between the transverse processes and the outer wall of the spinal canal into one, greatly enhancing the posterior and lateral stability of the lumbar spine. The firmness is improved, the maximum contact area between the autologous bone and the bone graft surface is achieved, and the success rate of bone graft fusion is improved. According to the actual situation, unilateral surgery also reduces the wound surface.

[0012] The fixing method of the utility model forms a space between the adjacent upper and lower vertebrae, thereby avoiding the compression of deep nerves by the bone graft, and has high safety. The side wall of the cage is provided with a through hole, which helps the blood supply during the vertebral fusion process and promotes the speed of vertebral fusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 It is a usage state diagram of the utility model;

[0015] The symbols in the accompanying drawings indicate: 1. cage body, 2. connecting plate, 3. through hole, 4. screw positioning hole, 5. screw. DETAILED DESCRIPTION

[0016] The following is a further detailed description of the specific implementation of the utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the utility model.

[0017] like Figure 1 to Figure 2 The utility model comprises a connecting plate 2 and a cage 1. The side of the cage 1 is open, the side wall of the cage 1 is sheet-shaped, the end of the cage 1 is U-shaped, and the side wall of the cage 1 is evenly distributed with through holes 3. The top and bottom ends of the cage 1 are provided with connecting plates 2, and the connecting plates 2 are provided with connecting mechanisms. The height of the cage 1 is individually customized according to the transverse process spacing of the upper and lower vertebrae of the lumbar vertebrae of different patients, so that the cage 1 of the fusion device can be highly consistent with the bone structure between the transverse processes of the patient.

[0018] There are two connecting plates, which are respectively arranged at the top and bottom ends of the same side of the cage body 1. The length of the connecting plate can also be cut according to the patient's bone characteristics.

[0019] The connection mechanism comprises a screw 5 and a screw positioning hole 4. The screw positioning hole 4 is arranged at the end of the connection plate 2. The screw 5 passes through the screw hole to fix the connection plate 2 on the bone.

[0020] The cage 1 is preferably made of titanium. Titanium has high strength, low density, high hardness, high melting point and strong corrosion resistance. Compared with other metals, titanium has good plasticity.

[0021] During the operation, after the bulge of the intervertebral disc is treated, bone grafting and fusion are performed on the posterolateral side of the lumbar spine. The cage 1 of the utility model is used to wrap the outer side of the vertebral body, and the connecting plate is located on the posterior side of the vertebral body. The upper and lower transverse processes of the adjacent vertebral bodies are fixed with the fusion device through screws 5. The broken bone pieces taken out by decompressing the spinal canal are filled into the cage 1. The side wall of the cage 1 is provided with a through hole 3. The characteristics of the rich blood supply of the posterolateral side of the lumbar spine are utilized to facilitate the blood supply in the vertebral fusion process and promote the speed of vertebral fusion.

[0022] Conventional bone grafts that are too deep may compress the nerves below them, and bone grafts that are too shallow may cause the bone block to change its position or move after surgery, and the purpose of fusion cannot be achieved. The use of the utility model can make the autologous bone block three-dimensionally combined with the upper vertebral transverse process, the lower vertebral transverse process, the isthmus and the lateral bone of the superior articular process, greatly enhancing the posterolateral stability of the lumbar spine. On the connecting plate of the cage body 1, screws 5 are used to fix the upper and lower superior articular processes. In addition, unilateral or bilateral pedicle screws can be used for fixation depending on the situation.

[0023] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A lumbar posterolateral fusion cage, characterized in that: The cage body (1) comprises a cage body (1) and a connecting plate (2); the side of the cage body (1) is open, the side wall of the cage body (1) is sheet-shaped, the end of the cage body (1) is U-shaped, the side wall of the cage body (1) is evenly distributed with through holes (3), the top and bottom ends of the cage body (1) are provided with connecting plates (2), and the connecting plates (2) are provided with connecting mechanisms.

2. The posterolateral lumbar fusion cage according to claim 1, characterized in that: Two connecting plates (2) are provided, and the connecting plates (2) are respectively arranged at the top end and the bottom end of the same side of the cage body (1).

3. The posterolateral lumbar fusion cage according to claim 2, characterized in that: The connecting mechanism comprises a screw (5) and a screw positioning hole (4); the screw positioning hole (4) is provided at the end of the connecting plate (2); the screw (5) passes through the screw hole to fix the connecting plate (2) on the bone.

4. The posterolateral lumbar fusion cage according to claim 3, characterized in that: The cage body (1) is made of titanium metal.

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