An artificial joint coating structure and artificial joint thereof

Abstract

The present invention relates to the field of 3D printing technology, and in particular to an artificial joint coating structure. The coating body is a three-dimensional mesh structure, which includes nodes and mesh wires connected between adjacent nodes; the three-dimensional mesh structure is composed of a plurality of interconnected units, and the outer contour of the unit is a six-sided frame structure, which includes 12 edges and 8 vertices, and the mesh wires include outer mesh wires formed by the edges of the unit body, and the nodes include outer nodes formed by the vertices of the unit body, and the outer nodes and outer mesh wires of the corresponding faces of adjacent units overlap. The present invention also discloses an artificial joint. The beneficial effects of the present invention are: the obtained coating structure has a uniform structure at the macroscopic level, structural differences at the microscopic level, a porosity similar to that of real human bones, high strength, and good integration with human tissues; the modeling method of the present invention is convenient for formation using metal laser 3D printing.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to an artificial joint coating structure and an artificial joint thereof. Background Art

[0002] Currently, artificial joint replacement has been widely used in clinical practice to treat osteoarthritis of the shoulder, hip and other joints, fractures, bone injuries, ischemic necrosis of bones and other diseases. Existing artificial joint prostheses have various structural designs, and the porous coating on the surface of the artificial joint is crucial to the effect of prosthesis replacement, which determines the biocompatibility and durability between the prosthesis and human tissue.

[0003] Currently, the technologies used to manufacture porous surface coatings in artificial joints are mostly metal microbead sintering, metal filament weaving, and plasma spraying. More advanced technologies such as chemical vapor deposition and arc ion plating low-temperature deposition are also used to manufacture surface coatings for artificial joints. These technologies are limited by their manufacturing principles and low resolution. It is difficult to accurately control the geometry of the pore structure in the coating during the manufacturing process, and it is difficult to meet the requirements for the human bone tissue to grow well into the coating structure. This directly leads to the low compatibility of artificial joint implants with the human body's own bones and poor durability. Generally speaking, every ten years or even several years, due to the decline in the performance of the joint implant, artificial joint replacement surgery is required, which causes great physical and mental pain to the patient. Therefore, for younger patients, the compatibility and long-term stability of the implant with the human body are particularly important.

[0004] Laser metal 3D printing technology has developed rapidly in recent years. It has the characteristics of high resolution and precise control of printed component structure, and can form parts with extremely complex shapes. It has been increasingly widely used in industrial manufacturing, scientific research and medical fields. This brings greater structural design freedom to the manufacturing process of artificial prosthesis coatings, making it possible to achieve a more ideal artificial prosthesis structure.

[0005] However, 3D printing technology is highly dependent on computer-aided design, especially in the computer algorithms for designing porous structures and the preparation of printer data. Therefore, how to design an artificial joint coating structure that is biocompatible and durable with human bone tissue is a key issue in the successful application of laser metal 3D printing in the manufacture of high-performance artificial joint coatings. Summary of the invention

[0006] The present invention aims at the above-mentioned deficiencies of the existing artificial joint porous coating manufacturing technology and provides an artificial joint coating structure which can significantly improve the quality of the prosthesis.

[0007] The technical solution of the present invention to solve the above technical problems is as follows:

[0008] An artificial joint coating structure includes a coating body, characterized in that the coating body is a three-dimensional mesh structure, the three-dimensional mesh structure includes nodes and mesh wires connected between adjacent nodes. The three-dimensional mesh structure is composed of a plurality of mutually connected unit bodies, the outer contour of the unit body is a six-sided frame structure, the six-sided frame structure includes 12 edges and 8 vertices, the mesh wires include outer mesh wires formed by the edge lines of the unit body, the nodes include outer nodes formed by the vertices of the unit body, and the outer nodes and outer mesh wires of the corresponding faces of adjacent unit bodies overlap.

[0009] The beneficial effects of the present invention are as follows: the use of a three-dimensional mesh structure can be based on the specific requirements of the implant to be made, by flexibly setting the thickness of the mesh and the distance between the mesh connection nodes, it can better ensure that the implant has a microstructure similar to the real bone structure, and the high porosity can allow the bone tissue to grow deeper into the artificial coating compared to the traditional bone growth coating structure, thereby providing a higher bonding strength. At the same time, different microstructures generated by different parameters provide customization possibilities for different individuals. The outer contour of the unit body is a six-sided frame structure, which can fully ensure the properties of the coating structure such as low relative density, light weight, and good permeability.

[0010] Based on the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, the nodes also include inner nodes arranged in the unit body, and the mesh wires also include inner mesh wires formed by connecting the outer nodes of the unit body and the inner nodes.

[0012] The beneficial effect of adopting the above further scheme is that the external nodes of the six-sided frame structure are connected to a point inside the six-sided frame, namely the internal node, which further improves the support strength of the coating while ensuring a low relative density. Due to the connection between the internal node and the external node, all mesh wires can be summarized to one side of a certain triangle, so that the three-dimensional mesh structure of the present invention has the stability of a triangle, that is, high support strength.

[0013] Furthermore, the position of the inner node is determined by an offset obtained through random function calculation.

[0014] The beneficial effect of adopting the above further scheme is that the position of the internal nodes is randomly moved, and its movement range is inside or outside the six-sided frame, so that the overall structure of the coating is uniform, while the unit body structure has relative differences, which is closer to the characteristics of human bones, thereby promoting biocompatibility.

[0015] Furthermore, the outer contour of the unit body is a parallelepiped frame structure or a non-parallelepiped frame structure. The non-parallelepiped frame structure is formed by calculating one or more external nodes of the parallelepiped frame structure through a random function to obtain an offset and then moving the position.

[0016] The beneficial effect of adopting the above further scheme is that a non-parallel six-sided frame structure can also be formed by randomly moving the external nodes of the parallel six-sided frame structure. This structure not only retains the uniformity of the overall coating structure, but also has the relative difference of the unit body's own shape, which is more compatible with the characteristics of the irregular structure of the human skeleton, thereby promoting biocompatibility.

[0017] Furthermore, the parallelepiped frame structure includes a regular hexahedral frame structure.

[0018] The beneficial effect of adopting the above further solution is that the regular hexagonal frame structure is easy to represent when constructing the model, which reduces the amount of calculation for the subsequent randomization process.

[0019] The present invention also discloses an artificial joint, characterized in that it comprises a substrate and the coating as described above, wherein the coating is formed on the substrate by 3D laser printing.

[0020] The beneficial effect of the present invention is that the coating structure is adopted at the joint surface between the artificial joint and the human body, which not only ensures the integration with the human body structure but also reduces the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of an artificial joint coating of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the unit body (parallel six-sided frame structure) of the present invention;

[0023] Figure 3 for Figure 2 Schematic diagram of the structure after the positions of the Chinese and foreign nodes are transformed;

[0024] Figure 4 It is a schematic diagram of the unit structure with inner mesh wire of the present invention;

[0025] Figure 5 for Figure 4 Schematic diagram of the unit body structure after the position of the internal nodes is transformed;

[0026] Figure 6 for Figure 5 Schematic diagram of the unit structure after the position of the external nodes is transformed;

[0027] Figure 7 The 3D printing data model generation process of the joint coating body described in the invention

[0028] Schematic diagram (plane);

[0029] Figure 8 A schematic diagram of the organizational structure of a cube three-dimensional model according to the present invention;

[0030] Fig. 9 for Figure 8 A partial enlarged view of

[0031] Fig.10 The figure is a schematic diagram of the structure of an artificial joint of the present invention.

[0032] In the figure, 1, three-dimensional model S; 2, circumscribed rectangular frame SBB; 3, unit body; 3-1, outer mesh wire; 3-2, inner mesh wire; 3-3, outer node; 3-4, inner node; 01, substrate; 02, coating. DETAILED DESCRIPTION

[0033] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0034] like Figure 1-Figure 6 As shown, an artificial joint coating structure includes a coating body, wherein the coating body 02 is a three-dimensional mesh structure, and the three-dimensional mesh structure includes nodes and mesh wires connected between adjacent nodes.

[0035] The three-dimensional mesh structure is composed of a plurality of interconnected units 3, the outer contour of the unit 3 is a six-sided frame structure, the six-sided frame structure includes 12 edges and 8 vertices, the mesh includes an outer mesh 3-1 formed by the edges of the unit, the nodes include outer nodes 3-3 formed by the vertices of the unit 3, and the outer nodes 3-3 and outer mesh 3-4 of the corresponding faces of adjacent unit 3 overlap.

[0036] The nodes also include inner nodes 3-4 arranged in the unit body 3, and the mesh also includes inner mesh 3-2 formed by connecting the outer nodes 3-3 of the unit body 3 and the inner nodes 3-4.

[0037] The position of the inner node 3-4 is determined by the offset obtained by random function operation.

[0038] The outer contour of the unit body 3 is a parallelepiped frame structure or a non-parallelepiped frame structure. The non-parallelepiped frame structure is formed by calculating the offset of one or more external nodes 3-3 of the parallelepiped frame structure through a random function and moving the position according to the offset. When the coordinates of the external nodes 3-3 change, the corresponding external mesh wires change accordingly, thereby forming a non-parallelepiped frame structure.

[0039] The parallelepiped frame structure includes a regular hexahedral frame structure.

[0040] When a specific random function is operated, a limit is given to the offset percentage (the offset percentage can be taken as -60% to +60% of the unit body side length). For example, the maximum offset is plus or minus 60% of the unit body side length, that is, the increase or decrease of the coordinate value of each dimension of each vertex is at most 60% of the unit body side length.

[0041] like Figure 7 As shown, the steps for generating the 3D printing data model of the joint coating body of the present invention are as follows; for ease of understanding, it is assumed that the coating body is spherical, and a plane view is used for clear observation.

[0042] 1) A three-dimensional model S1 is established in a computer according to the coating body structure; the contour of the three-dimensional model is the contour of the coating to be formed.

[0043] 2) Calculate the circumscribed rectangular box SBB2 (S Bounding Box) of the three-dimensional model S1;

[0044] 3) voxelizing the circumscribed rectangular frame SBB of the three-dimensional model S; the voxelization is to divide the circumscribed rectangular frame SBB into a plurality of parallelepiped frames in three-dimensional distribution, each of which is a unit body 3, each of which includes 12 edges, 8 external nodes 3-3 and 1 internal node 3-4, the edges of each unit body 3 and the lines connecting the external nodes and the internal nodes form the mesh, and the interior of the circumscribed rectangular frame SBB presents the three-dimensional mesh structure;

[0045] 4) Trimming: trimming the circumscribed rectangular frame SBB, i.e. removing the nodes and meshes outside the three-dimensional model S1 to form a three-dimensional structure that matches the outline of the three-dimensional model S1;

[0046] 5) The position coordinates of each of the cut external nodes, internal nodes and mesh wires are stored and form modeling data, thus completing the construction of the 3D printing data model.

[0047] When 3D printing an artificial joint coating, the modeling data only needs to be treated as a three-dimensional model and processed in layers according to the plane. Then the 3D printer can print in layers to form a prosthetic coating 02 with a three-dimensional mesh structure.

[0048] like Figure 8 and Fig. 9 As shown, it is a schematic diagram of the organizational structure of a cube three-dimensional model according to the present invention;

[0049] like Fig.10As shown, the present invention also discloses a schematic diagram of an artificial joint structure, which includes a substrate 01 and a coating 02 as described above, wherein the coating 02 is formed on the substrate by 3D laser printing.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An artificial joint coating structure, comprising a coating body, characterized in that: The coating body is in a three-dimensional mesh structure, and the three-dimensional mesh structure includes nodes and mesh wires connected between adjacent nodes; The three-dimensional mesh structure is composed of a plurality of interconnected units, the outer contour of the unit is a six-sided frame structure, the six-sided frame structure includes 12 edges and 8 vertices, the mesh wires include outer mesh wires formed by the edges of the unit bodies, the nodes include outer nodes formed by the vertices of the unit bodies, and the outer nodes and outer mesh wires of the corresponding faces of adjacent unit bodies overlap; The nodes also include inner nodes arranged in the unit body, and the mesh wires also include inner mesh wires formed by connecting the outer nodes of the unit body and the inner nodes; The position of the inner node is determined by the offset obtained by random function operation; The outer contour of the unit body is a parallelepiped frame structure or a non-parallelepiped frame structure; the non-parallelepiped frame structure is formed by calculating one or more external nodes of the parallelepiped frame structure through a random function to obtain an offset and move the position.

2. The artificial joint coating structure according to claim 1, characterized in that: The parallelepiped frame structure is a regular hexahedral frame structure.

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