阅读说明：本技术 一种下颈椎解剖型钛笼 (Anatomical titanium cage for lower cervical vertebra ) 是由 贺西京 顾鹏真 卢腾 贺高乐 于 2019-11-21 设计创作，主要内容包括：本发明属于医用假体制造技术领域,涉及一种下颈椎解剖型钛笼,包括：钛笼本体,钛笼本体的上端为穹隆结构,下端为斜型结构,穹隆结构与斜型结构之间设有网状结构,网状结构分别与穹隆结构、斜型结构相连接；网状结构包括相连接的第一前表面、第一后表面、第一左侧面及第一右侧面,第一前表面、第一后表面均呈弧形结构,第一左侧面、第一右侧面均呈平面结构。根据颈椎解剖数据测量结果对下颈椎解剖型钛笼的上端采用穹隆结构的设计,并且在对下颈椎解剖型钛笼的下端采用斜型结构的设计,模拟颈椎手术节段角度,从而扩大了钛笼与颈椎终板之间的接触面积,降低应力集中现象,使得应力均匀地分布在终板表面,进而降低钛笼塌陷的发生率。(The invention belongs to the technical field of medical prosthesis manufacturing, and relates to a lower cervical vertebra anatomical titanium cage, which comprises: the titanium cage comprises a titanium cage body, wherein the upper end of the titanium cage body is of a dome structure, the lower end of the titanium cage body is of an inclined structure, a net structure is arranged between the dome structure and the inclined structure, and the net structure is respectively connected with the dome structure and the inclined structure; the net structure comprises a first front surface, a first rear surface, a first left side surface and a first right side surface which are connected, the first front surface and the first rear surface are both arc-shaped structures, and the first left side surface and the first right side surface are both plane structures. The upper end of the lower cervical vertebra anatomical titanium cage is designed to be of a dome structure according to the measurement result of the cervical vertebra anatomical data, and the lower end of the lower cervical vertebra anatomical titanium cage is designed to be of an inclined structure, so that the angle of a cervical vertebra operation section is simulated, the contact area between the titanium cage and a cervical vertebra end plate is enlarged, the stress concentration phenomenon is reduced, the stress is uniformly distributed on the surface of the end plate, and the incidence rate of the titanium cage collapse is reduced.)

1. An anatomical titanium cage for the lower cervical spine, comprising: the titanium cage comprises a titanium cage body, wherein the upper end of the titanium cage body is provided with a dome structure (1), the lower end of the titanium cage body is provided with an inclined structure (2), a net structure (3) is arranged between the dome structure (1) and the inclined structure (2), and the net structure (3) is respectively connected with the dome structure (1) and the inclined structure (2); the net-shaped structure (3) comprises a first front surface (4), a first left side surface (6), a first rear surface (5) and a first right side surface (7) which are sequentially connected, the first front surface (4) and the first rear surface (5) are both arc-shaped structures, and the first left side surface (6) and the first right side surface (7) are both plane structures.

2. The anatomical titanium cage for the lower cervical spine according to claim 1, wherein the titanium cage has a square structure as a whole.

3. The titanium cage according to claim 1 or 2, characterized in that said first left (6) and right (7) lateral surfaces are parallel to each other.

4. The lower cervical anatomical titanium cage according to claim 1, wherein the dome (1) comprises four arc structures connected front, back, left and right; the top point of the left arc-shaped structure and the top point of the right arc-shaped structure are respectively located at the rear 1/3 position of the corresponding arc-shaped structure and decrease progressively towards the two sides, and the top point of the front arc-shaped structure and the top point of the rear arc-shaped structure are respectively located at the middle position of the corresponding arc-shaped structure and decrease progressively towards the two sides.

5. The anatomical titanium cage of lower cervical vertebra according to claim 1, characterized in that a plurality of diamond-shaped structure layers are distributed along the circumferential direction of the mesh structure (3), adjacent diamond-shaped structure layers are staggered, and each diamond-shaped structure layer comprises a plurality of diamond-shaped meshes (8).

6. The anatomical titanium cage of lower cervical vertebra according to claim 5, wherein the number of layers of the diamond-shaped structure layer is six, and the number of diamond-shaped meshes (8) in each layer is nine.

7. The lower cervical anatomical titanium cage according to claim 5, characterized in that the mesh structure (3) has a height of 19mm, a width of 2mm and a thickness of 2 mm.

8. The lower cervical anatomical titanium cage according to claim 1, wherein the oblique structure (2) comprises a second front surface, a second left side surface, a second rear surface and a second right side surface which are connected in sequence, the second front surface and the second rear surface are both arc-shaped structures, and the second left side surface and the second right side surface are both oblique structures.

9. The anatomical titanium cage of lower cervical vertebra according to claim 8, wherein the vertexes of the second anterior surface and the second posterior surface are distributed at the middle position of the second anterior surface and the second posterior surface correspondingly, and decrease from the vertexes to both sides smoothly.

10. The titanium cage of claim 8, wherein the vertex of the second left side and the vertex of the second right side are respectively located at the rear end of the corresponding oblique structure, and the heights of the second left side and the second right side are respectively increased from the front end to the rear end of the corresponding oblique structure.

Technical Field

The invention belongs to the technical field of medical prosthesis manufacturing, and relates to a lower cervical vertebra anatomical titanium cage.

Background

At present, the combination of the secondary total resection and decompression of the cervical vertebra and the bone grafting fusion of the titanium cage is a common operation mode for treating cervical spondylosis, cervical spinal stenosis, cervical vertebra fracture with spinal cord compression or old fracture dislocation and incomplete spinal cord injury and the like. The operation mode adopts the steps that the corresponding vertebral bodies and intervertebral discs are exposed through the anterior path, vertebral body nails are respectively placed on the upper vertebral body and the lower vertebral body which are adjacent to the vertebral body to be resected, and a vertebral body dilator is placed to prop the upper vertebral body and the lower vertebral body at a certain height. The pathological intervertebral discs at two ends are removed, most of vertebral bodies and posterior longitudinal ligaments of the vertebra are completely removed from the vertebral bodies running on the inner sides of the bilateral uncinate vertebral joints, titanium cages (bone implantation particles are filled) with proper length are implanted into the pressure reduction grooves, and proper anterior cervical steel plates are selected to be fixed on the upper vertebral body and the lower vertebral body. A large number of clinical studies have proved that it has better surgical efficacy. The operation segment can obtain immediate stability after operation, and provides a stable biomechanical environment for the recovery of the nerve function.

However, related postoperative follow-up studies find that partial patients have the condition that the titanium cage sinks and collapses, and the postoperative curative effect of the patients is influenced. Yu Chen et al performed a postoperative follow-up on 300 patients who underwent a cervical vertebral body sub-total resection and decompression in combination with titanium cage bone grafting fusion. Follow-up results revealed that 182 (60.7%) patients developed mild titanium cage collapse (1-3mm) and 57 patients developed severe titanium cage collapse (> 3 mm). Compared with the patient who does not have the titanium cage collapse after the operation, the nerve function recovery condition of the patient with the titanium cage collapse is obviously lower than that of the patient without the titanium cage collapse. In addition, severe titanium cage collapse can lead to complications such as neck pain, impaired nerve function, and fixation failure. (Chen Y, Chen DY, Guo YF, et al. Subsidence of Titanium MeshCage A Study Based on 300 Cases [ J ]. Journal of Spinal Disorders & Techniques,2008,21(7): 489-. In the traditional titanium cage implantation process, the length of the titanium cage needs to be trimmed to the length of a bone groove. The uncut surface of the titanium cage is of a smooth structure and has 6 flat contact points, and the cut end is 12 sharp contact points under most conditions. The point contact mode causes the surface pressure load of the vertebral body end plate to be larger, and the titanium cage is easy to be penetrated into the vertebral body caused by the structural damage of the vertebral body end plate, so that the titanium cage is collapsed. (Xujianwei, Jialianshun, Chengdyu et al, study of early collapse of cervical anterior vertebral body after total resection of titanium mesh bone graft [ J ]. J.China J.orthopedics, 2002, 10(z1):1267-1269.)

In order to prevent collapse of a titanium cage after a cervical vertebra sub-total resection and decompression combined titanium cage bone grafting fusion operation and avoid occurrence of complications such as neck pain, nerve function damage, fixation failure and the like caused by collapse of the titanium cage, anatomical parameters such as front and back diameters, left and right diameters, sagittal plane radian radius, coronal plane radian radius, cervical vertebra operation section height, operation section angle and the like of upper and lower end plates of a cervical vertebra are measured, and a lower cervical vertebra anatomical titanium cage is designed according to the parameters.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the anatomical titanium cage for the lower cervical vertebra, which reduces the pressure on the surface of a vertebral body end plate and the damage of the vertebral body end plate caused by overlarge pressure by increasing the contact area of the titanium cage and the vertebral body end plate, thereby overcoming the problem of the collapse of the titanium cage after the traditional titanium cage is implanted.

In order to achieve the purpose, the invention provides the following technical scheme:

an anatomical titanium cage for the lower cervical spine comprising: the titanium cage comprises a titanium cage body, wherein the upper end of the titanium cage body is of a dome structure, the lower end of the titanium cage body is of an inclined structure, a net structure is arranged between the dome structure and the inclined structure, and the net structure is respectively connected with the dome structure and the inclined structure; the net structure comprises a first front surface, a first left side surface, a first rear surface and a first right side surface which are sequentially connected, the first front surface and the first rear surface are both arc-shaped structures, and the first left side surface and the first right side surface are both plane structures.

Furthermore, the titanium cage is of a square structure as a whole, and the strength advantages of the rear part and the rear and outer side of the end plate can be fully utilized by designing the titanium cage into a square shape, so that the surgical segment can obtain better mechanical property, and the titanium cage can be prevented from collapsing; under the same diameter, the square design has larger bone grafting volume compared with the traditional circular design, can contain more cancellous bone particles and is beneficial to bone grafting fusion of an operation section; the two side surfaces of the titanium cage are plane due to the square design, so that the contact area between the titanium cage and the residual vertebral body is increased, and the osseous fusion between the titanium cage and the residual vertebral body is facilitated.

Further, the first left side surface and the first right side surface are parallel to each other.

Further, the dome structure comprises a front arc structure, a rear arc structure, a left arc structure and a right arc structure which are connected; the top point of the left arc-shaped structure and the top point of the right arc-shaped structure are respectively located at the rear 1/3 position of the corresponding arc-shaped structure and decrease progressively towards the two sides, and the top point of the front arc-shaped structure and the top point of the rear arc-shaped structure are respectively located at the middle position of the corresponding arc-shaped structure and decrease progressively towards the two sides.

Furthermore, a plurality of diamond-shaped structure layers are distributed on the net-shaped structure along the circumferential direction, adjacent diamond-shaped structure layers are arranged in a staggered mode, and each diamond-shaped structure layer comprises a plurality of diamond-shaped meshes.

Furthermore, the number of layers of the diamond-shaped structure layer is six, and the number of diamond-shaped meshes in each layer is nine.

Furthermore, the height of the net-shaped structure is 19mm, the width of the net-shaped structure is 2mm, and the thickness of the net-shaped structure is 2 mm.

Further, the oblique structure includes second front surface, second left surface, second rear surface and the second right flank that connects gradually, second front surface, second rear surface all are the arc structure, second left surface, second right flank all are oblique structure.

Furthermore, the vertex of the second front surface and the vertex of the second rear surface are respectively positioned at the middle positions of the second front surface and the second rear surface, and smoothly and gradually decrease from the vertex to the two sides and are upwards connected with the mesh structure.

Furthermore, the vertex of the second left side surface and the vertex of the second right side surface are respectively located at the rear end of the corresponding oblique structure, and the heights of the second left side surface and the second right side surface are respectively increased from the front end to the rear end of the corresponding oblique structure and are upwards connected with the mesh structure.

Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects: the upper end of the lower cervical vertebra anatomical titanium cage is designed to be of a dome structure according to the measurement result of the cervical vertebra anatomical data, and the lower end of the lower cervical vertebra anatomical titanium cage is designed to be of an inclined structure, so that the angle of a cervical vertebra operation section is simulated, the contact area between the titanium cage and a cervical vertebra end plate is enlarged, the stress concentration phenomenon is reduced, the stress is uniformly distributed on the surface of the end plate, and the incidence rate of the titanium cage collapse is reduced.

In addition, through designing the anatomical titanium cage of lower cervical vertebra for square, have huge advantage in the aspect of operation segment fusion and support intensity: the titanium cage is designed to be square, so that the strength advantages of the rear part and the external back part of the end plate can be fully utilized, the surgical segment can obtain better mechanical property, and the titanium cage can be prevented from collapsing; under the same diameter, the square design has larger bone grafting volume compared with the traditional circular design, can contain more cancellous bone particles and is beneficial to bone grafting fusion of an operation section; the two side surfaces of the titanium cage are plane due to the square design, so that the contact area between the titanium cage and the residual vertebral body is increased, and the osseous fusion between the titanium cage and the residual vertebral body is facilitated.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a side view of a lower cervical anatomical titanium cage provided by the present invention;

FIG. 2 is a front view of a lower cervical anatomical titanium cage provided by the present invention;

FIG. 3 is a top view of the anatomical titanium cage for the lower cervical spine provided by the present invention;

FIG. 4 is a bottom view of the anatomical titanium cage for the lower cervical spine provided by the present invention;

FIG. 5 is a rear view of the anatomical titanium cage for the lower cervical spine provided by the present invention;

fig. 6 is an isometric view of a lower cervical anatomical titanium cage provided by the present invention.

Wherein: 1 is a dome structure; 2 is an inclined structure; 3 is a net structure; 4 is a first front surface; 5 is a first rear surface; 6 is a first left side; 7 is a first right side; 8 is a diamond mesh.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and examples.