CN106901877A - A kind of assembly type artificial vertebral body - Google Patents

Abstract

The invention relates to an assembled artificial vertebral body, which is characterized in that the artificial vertebral body includes a trapezoidal component and a U-shaped or H-shaped base, the trapezoidal component includes an end plate and a conical joint body, and the end plate is integrally arranged on the conical joint body Bottom surface; the U-shaped base is a cylindrical shape with an open top surface and a closed bottom surface. It has an accommodation space that matches the conical joint body of the trapezoidal component. The conical joint body of the trapezoidal component is press-fitted into the accommodation space of the U-shaped base. In the middle; the H-shaped base is open at both ends, and the middle part has a cylindrical shape with a horizontal bottom. The two ends of the H-shaped base are respectively pressed into the accommodation space of the H-shaped base. The present invention can be widely used in vertebral body bone defect reconstruction after vertebral body tumor resection, and can be significantly improved no matter from short-term structural recovery to long-term patient function and quality of life.

Description

An Assembled Artificial Vertebral Body

technical field

The invention relates to an artificial prosthesis, in particular to a modular artificial vertebral body used in vertebral body resection and reconstruction.

Background technique

Infectious diseases such as spinal tumors, severe vertebral fractures, and spinal tuberculosis can often cause damage to the vertebral body, resulting in compression of the spinal cord, nerve roots, and angular deformity of the spine caused by vertebral body collapse. In this case, vertebral body resection is often required surgery. Especially for spinal tumors, the entire or even multiple vertebral bodies are often involved. Due to the large resection range, the local stability is severely damaged. If there is no effective reconstruction, the internal fixation failure of the patient often occurs after surgery, which will lead to severe neurological function. damage and spinal deformity.

As early as 1969, Hamdi first reported the resection of vertebral tumors and replaced them with prostheses. Since then, a wide variety of artificial vertebral bodies have gradually developed. At present, artificial vertebral bodies are mainly divided into the following types: filling type (such as bone cement), supporting type (such as titanium mesh), and adjustable artificial vertebral body. Among them, titanium mesh is the most widely used, but the titanium mesh and its internal bone graft block are only in point contact with the upper and lower vertebral bodies, and the ability of bone conduction is very limited, so reliable bone graft fusion is often not achieved. In addition, the sharp edges of the titanium mesh may cut the upper and lower vertebral body endplates, resulting in the subsidence, loosening, and even prolapse of the implants. In some patients, paraplegia may even occur due to the loosening, shifting, and compression of the spinal cord by the titanium mesh.

It can be seen that the ideal artificial vertebral body should not only have good immediate postoperative stability, but also long-term stability, that is, the artificial vertebral body should form reliable bony healing with the upper and lower adjacent vertebral bodies. At the same time, it should have the characteristics of convenient placement and adjustable height. In recent years, a large number of studies have shown that porous metals not only have good tissue compatibility and ideal biomechanical structure, but more importantly, they have good osteoconductive properties, which are beneficial to host bone ingrowth and high fusion rate.

Contents of the invention

In view of the above problems, the object of the present invention is to provide a modular artificial vertebral body used in vertebral body resection and reconstruction.

In order to achieve the above object, the present invention adopts the following technical solutions: an assembled artificial vertebral body, characterized in that the artificial vertebral body includes a trapezoidal assembly and a U-shaped base, and the trapezoidal assembly includes an end plate and a conical joint , the end plate is integrally arranged on the bottom surface of the conical joint body; the U-shaped base is a cylindrical shape with an open top surface and a closed bottom surface. Space, the taper body of the trapezoidal assembly is press-fitted in the accommodating space of the U-shaped base; the surface of the end plate and the bottom surface of the U-shaped base form the upper and lower end of the adjacent vertebral body The contact surface of the board connection.

In a preferred embodiment, both the end plate and the conical joint are of fixed height, and the bottom surface of the U-shaped base is designed to be of various thicknesses, and can be adjusted by selecting the U-shaped base with different bottom thicknesses. The height of the artificial vertebral body.

In a preferred embodiment, the contact surface between the endplate and the U-shaped base and the upper and lower endplates of the adjacent vertebral body is an intersecting curved porous structure with a porosity of 80-90% and a pore diameter of 300-500 microns Or orthogonal porous structure, and printed by electron beam dissolution method.

In a preferred embodiment, both the trapezoidal component and the U-shaped base adopt a solid structure edge design, while the rest is a porous structure with a porosity of 60-65% and a pore diameter of 1-2mm, and is dissolved by sub-beams produced by printing.

In a preferred embodiment, the conical body of the trapezoidal component is a hollow structure, and a metal reinforcement structure is arranged inside it.

In a preferred embodiment, the artificial vertebral body includes two trapezoidal components and an H-shaped base, and the trapezoidal component includes an end plate and a conical joint body; the end plate is integrally arranged on the bottom surface of the conical joint body; The H-shaped base is open at both ends, and the middle part has a cylindrical shape with a horizontal bottom. Both sides of the horizontal bottom are accommodation spaces that match the conical joints of the trapezoidal components. The body is press-fitted into the accommodation space of the H-shaped base from both ends of the H-shaped base; the surfaces of the two end plates form a contact surface connected with the upper and lower end plates of adjacent vertebral bodies.

In a preferred embodiment, both the endplate and the conical joint are of fixed height, the horizontal bottom of the H-shaped base is designed to be of various thicknesses, and by selecting the H-shaped base with different thicknesses of the horizontal bottom To adjust the height of the artificial vertebral body.

In a preferred embodiment, the contact surfaces between the two endplates and the upper and lower endplates of adjacent vertebral bodies are intersecting curved porous structures with a porosity of 80-90% and a pore diameter of 300-500 microns or orthogonal It has a porous structure and is printed by electron beam dissolution.

In a preferred embodiment, both the trapezoidal component and the H-shaped base adopt a solid structure edge design, while the rest is a porous structure with a porosity of 60-65% and a pore diameter of 1-2mm, and is dissolved by sub-beams produced by printing.

In a preferred embodiment, the conical body of the trapezoidal component is a hollow structure, and a metal reinforcement structure is arranged inside it.

Due to the adoption of the above technical scheme, the present invention has the following advantages: the present invention can be widely used in the bone defect reconstruction of vertebral bodies after vertebral body tumor resection, and can obtain significant improvement from short-term structural recovery to long-term patient function and quality of life. improve.

Description of drawings

FIG. 1 is a schematic structural view of Embodiment 1 of the present invention;

FIG. 2 is a schematic structural diagram of Embodiment 2 of the present invention;

Fig. 3 is a schematic structural view of the top and/or bottom of the present invention.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. However, it should be understood that the accompanying drawings are provided only for better understanding of the present invention, and they should not be construed as limiting the present invention.

Embodiment one:

As shown in Figure 1, this embodiment provides an artificial vertebral body 100 suitable for single vertebral body resection, which includes a trapezoidal assembly 1 and a U-shaped base 2, the trapezoidal assembly 1 includes an end plate 11 and a conical joint body 12, and both the end plate 11 and the conical body 12 are of fixed height. The end plate 11 is integrally disposed on the bottom surface of the cone body 12 , and the area of the end plate 11 is larger than the area of the bottom surface of the cone body 12 . The U-shaped base 2 is a cylindrical shape with an open top surface and a closed bottom surface. It has a conical accommodation space that matches the conical joint body 12 of the trapezoidal component 1. The conical joint body 12 of the trapezoidal component 1 is press-fitted on the U. In the accommodating space of the type base 2. The bottom surface of the U-shaped base 2 is designed to be optional in various thicknesses, and the height of the artificial vertebral body 100 can be adjusted by selecting the U-shaped base 2 with different bottom thicknesses.

Embodiment two:

As shown in Figure 2, the present embodiment provides an artificial vertebral body 200 suitable for resection of multiple vertebral bodies, which includes two trapezoidal assemblies 1 and an H-shaped base 3, the trapezoidal assembly 1 includes an endplate 11 and a conical cone The connecting body 12, and the end plate 11 and the conical connecting body 12 are all of fixed height. The end plate 11 is integrally disposed on the bottom surface of the cone body 12 , and the area of the end plate 11 is larger than the area of the bottom surface of the cone body 12 . The H-shaped base 3 is open at both ends, and the middle part has a cylindrical shape with a horizontal bottom. The connectors 12 are respectively press-fitted into the accommodation space of the H-shaped base 3 from both ends of the H-shaped base 3 . The horizontal bottom of the H-shaped base 3 is designed to be of various thicknesses, and the height of the artificial vertebral body 200 can be adjusted by selecting the H-shaped base 3 with different horizontal bottom thicknesses.

In a preferred embodiment, the artificial vertebral body 100 or the artificial vertebral body 200 is connected with the upper and lower endplates of the adjacent vertebral body through two contact surfaces, and the contact surface connected with the upper and lower endplates of the adjacent vertebral body It is a cross-surface porous structure or an orthogonal porous structure with a porosity of 80-90% and a pore diameter of 300-500 microns (as shown in Figure 3), and is produced by printing with EBM (Electron Beam Melting, electron beam melting method), This porosity provides an optimal interface for bony healing, is optimal for osteocyte creep and expansion, and enables revascularization.

In a preferred embodiment, the trapezoidal component 1 and the U-shaped base 2 or the H-shaped base 3 are all designed with a solid structure edge to improve the performance of torsion resistance and compression resistance, and to ensure the mechanical strength of the screw-fixed part; while the rest It is a porous structure with a porosity of 60-65% and a pore diameter of 1-2mm, and it is also printed by EBM technology. This porosity can provide the best soft tissue attachment interface, which can reduce the formation of residual cavity, reduce postoperative infection, and improve Postoperative long-term function.

In a preferred embodiment, the conical body 12 of the trapezoidal assembly 1 is a hollow structure, and a metal reinforcing structure (not shown in the figure) is arranged inside it to improve the overall mechanical properties of the artificial vertebral body 100 or the artificial vertebral body 200 .

The above-mentioned embodiments are only used to illustrate the present invention, wherein the structure, connection mode and manufacturing process of each component can be changed to some extent, and any equivalent transformation and improvement carried out on the basis of the technical solution of the present invention should not excluded from the protection scope of the present invention.

Claims (10)

1. A kind of modular artificial vertebral body, it is characterized in that, this artificial vertebral body comprises a trapezoidal component and a U-shaped base, and described trapezoidal component comprises endplate and conical joint body, and described endplate is integrally arranged on described The bottom surface of the conical joint body; the U-shaped base is a cylindrical shape with an open top surface and a closed bottom surface, and its interior has an accommodation space that matches the conical joint body of the trapezoidal assembly. Press fit in the accommodating space of the U-shaped base; the surface of the end plate and the bottom surface of the U-shaped base form a contact surface connected with the upper and lower end plates of adjacent vertebral bodies. 2. A kind of assembled type artificial vertebral body as claimed in claim 1, it is characterized in that, described end plate and cone joint are all fixed heights, and the bottom surface of described U-shaped base is designed to be optional in various thicknesses, And the height of the artificial vertebral body is adjusted by selecting the U-shaped bases with different bottom thicknesses. 3. A kind of assembled type artificial vertebral body as claimed in claim 1, is characterized in that, the contact surface that described endplate and U-shaped base are connected with the upper and lower endplate of adjacent vertebral body is porosity 80- 90%, intersecting curved porous structure or orthogonal porous structure with a pore diameter of 300-500 microns, and printed by electron beam dissolution method. 4. A kind of modular artificial vertebral body as claimed in claim 1, is characterized in that, described trapezoidal component and U-shaped base all adopt the edge design of solid structure, and the remaining part is porosity 60-65%, The porous structure with a pore diameter of 1-2mm is printed by the sub-beam dissolution method. 5. A modular artificial vertebral body as claimed in claim 1 or 2 or 3 or 4, characterized in that the conical body of the trapezoidal component is a hollow structure, and a metal reinforcing structure is arranged inside it. 6. An artificial vertebral body suitable for resection of multiple vertebral bodies is characterized in that the artificial vertebral body comprises two trapezoidal assemblies and an H-shaped base, and the trapezoidal assembly includes an endplate and a conical joint; the endplate It is integrally arranged on the bottom surface of the taper body; the H-shaped base is open at both ends, and the middle part has a cylindrical shape with a horizontal bottom. Both sides of the horizontal bottom are compatible with the taper body of the trapezoidal assembly The conical joints of the two trapezoidal components are respectively press-fitted into the accommodating space of the H-shaped base from the two ends of the H-shaped base; The contact surface where the upper and lower endplates connect. 7. A modular artificial vertebral body as claimed in claim 6, characterized in that, the end plate and the conical joint are of fixed height, and the horizontal bottom of the H-shaped base is designed to be of various thicknesses. , and adjust the height of the artificial vertebral body by selecting the H-shaped bases with different horizontal bottom thicknesses. 8. A kind of modular artificial vertebral body as claimed in claim 6, is characterized in that, the contact surface that two described endplates are connected with the upper and lower endplates of adjacent vertebral bodies is porosity 80-90%, The intersecting surface porous structure or the orthogonal porous structure with a pore diameter of 300-500 microns is printed by the electron beam dissolution method. 9. A kind of modular artificial vertebral body as claimed in claim 6, is characterized in that, described trapezoidal component and H-shaped base all adopt the edge design of solid structure, and the remaining part is porosity 60-65%, The porous structure with a pore diameter of 1-2mm is printed by the sub-beam dissolution method. 10. A modular artificial vertebral body according to claim 6, 7, 8 or 9, characterized in that the conical body of the trapezoidal component is a hollow structure, and a metal reinforcement structure is arranged inside it.