CN210872251U

CN210872251U - Artificial joint coating structure

Info

Publication number: CN210872251U
Application number: CN201920870268.9U
Authority: CN
Inventors: 刘丹
Original assignee: Jiangsu Shuangen Intelligent Technology Co ltd
Current assignee: Jiangsu Shuangen Intelligent Technology Co ltd
Priority date: 2019-06-11
Filing date: 2019-06-11
Publication date: 2020-06-30
Anticipated expiration: 2029-06-11

Abstract

The utility model relates to a 3D prints technical field, especially relates to an artificial joint coating structure. The three-dimensional net structure comprises a coating body in a three-dimensional net structure, wherein the three-dimensional net structure comprises a plurality of units which are connected with each other, each unit comprises an outer node, an inner node and a net wire, each net wire is a connecting line of each outer node and each inner node of each unit, and the outer nodes of the corresponding surfaces of the adjacent units are overlapped. The positions of the outer nodes or the inner nodes are determined by the offset obtained by random function operation. The utility model has the advantages that; the obtained coating structure has the characteristics of uniform structure on the macroscopic scale, structural difference on the microscopic scale, high strength and good integration with human tissues, and the porosity is similar to that of a real human skeleton; facilitating 3D printing formation with laser.

Description

Artificial joint coating structure

Technical Field

The utility model relates to a 3D prints technical field, especially relates to an artificial joint coating structure.

Background

At present, the mode of replacing the artificial joint prosthesis is widely adopted clinically to treat diseases such as joint osteoarthritis, fracture, bone injury, bone ischemic necrosis and the like of shoulders, hips and the like. The existing artificial joint prosthesis has various structural designs, and the porous coating on the surface of the artificial joint is very important for the replacement effect of the prosthesis, which determines the problems of biocompatibility and durability between the prosthesis and human tissues.

The surface porous coating in the existing artificial joint manufacturing adopts the technologies of metal micro-bead sintering, metal filament weaving and plasma spraying. More advanced techniques such as chemical vapor deposition and arc ion plating low temperature deposition are also used to produce surface coatings for prosthetic joints. These techniques are limited by their manufacturing principles and relatively low resolution, and it is difficult to precisely control the geometry of the pore structure in the coating during the manufacturing process and to meet the requirements for good growth of human bone tissue into the coating structure. This directly results in a low compatibility of the artificial joint implant with the human body's own bone and a poor durability, and generally every ten years or even years, an artificial joint replacement operation which causes great pain to the mind and body of the patient is required again because of the decreased performance of the joint implant. Compatibility and long-term stability of the implant with the body is therefore of particular importance for younger patients.

The laser metal 3D printing technology which has been developed rapidly in recent years can form parts with extremely complex shapes due to the characteristics of high resolution and accurate control of the structure of the printing part, and is increasingly widely applied in the fields of industrial manufacturing, scientific research and medical treatment. This provides greater freedom in the design of the structure for the fabrication of the coating of the prosthesis, allowing the realization of a more ideal prosthesis structure.

However, 3D printing techniques rely heavily on computer aided design, especially in the preparation of computer algorithms and printer data for designing porous structures. Therefore, how to design an artificial joint coating structure with high biocompatibility and durability with human bone tissues is a key problem for successfully applying laser metal 3D printing to manufacturing a high-performance artificial joint coating.

In the print model generation algorithm, the following requirements are required for the algorithm: (1) rich set options to change the final generated structure; (2) the high stability ensures that the structures generated by using the same parameters for multiple times have very similar physical structures and performances; (3) the generated data format can be converted into an input format of a laser 3D printer.

SUMMERY OF THE UTILITY MODEL

The utility model provides an artificial joint coating structure which can obviously improve the quality of the false body aiming at the defects of the prior artificial joint porous coating manufacturing technology.

The utility model provides an above-mentioned technical problem's technical scheme as follows:

the artificial joint coating structure comprises a coating body and is characterized in that the coating body is of a three-dimensional net-shaped structure, and the three-dimensional net-shaped structure comprises nodes and net wires connected between the adjacent nodes.

The utility model has the advantages that: adopt three-dimensional network structure can be according to the concrete requirement of the implant of making, through nimble distance between setting for the net silk thickness and the net silk junction point, thereby assurance implant that can be better has the microstructure similar with real bone structure, high porosity compares and to increase coating structure and can let bone tissue more deep growth advance artificial coating and provide higher bonding strength in traditional bone. At the same time, the different microstructures created by the different parameters provide the possibility of customization for different individuals.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Further, the three-dimensional mesh structure comprises a plurality of units connected with each other, and the units are arranged in a manner that the units are connected with each other

The outer contour is of a six-sided frame structure, the nodes comprise outer nodes and inner nodes, and the six-sided frame structure

8 vertexes are the outer nodes, and one inner node is arranged in the six-face frame; the net silk is a connecting line of each outer node and the inner node of the unit, and the outer nodes of the corresponding surfaces of the adjacent units are overlapped.

The beneficial effect of adopting the further scheme is that: each outer joint through six frame structures is a little at six frame internal connection, and the support intensity of coating has further been improved when guaranteeing that relative density is low promptly for interior joint. Because the interior node is connected with outer node, make all net silks all can conclude a limit of certain triangle-shaped, consequently make the utility model discloses a three-dimensional network structure has possessed triangle-shaped's stability support intensity that is high promptly.

Further, the positions of the inner nodes are determined by offsets obtained through random function operation.

The beneficial effect of adopting the further scheme is that: the random movement of the position of the inner node is within or outside the six-sided frame, so that the coating has uniformity in the whole structure, and the unit body structure has relatively different properties, so that the characteristics of human bones are more similar, and the biocompatibility is promoted.

Furthermore, the outer contour of the unit is in a parallel six-face frame structure or a non-parallel six-face frame structure. The unparallel six-face frame structure is formed by calculating one or more outer nodes of the parallel six-face frame structure through a random function to obtain an offset and moving the position.

The beneficial effect of adopting the further scheme is that: the structure of the parallelepiped frame can also be formed by adopting a mode that external nodes randomly move for the structure of the parallelepiped frame. The structure not only keeps the uniformity of the whole coating structure, but also has relatively different shapes of the unit body, is more adaptive to the characteristic of the irregular structure of human skeleton, and further promotes biocompatibility.

Further, the parallelepiped frame structure includes a regular hexahedral frame structure.

The beneficial effect of adopting the further scheme is that: the regular hexahedral frame structure is easy to represent when a model is built, and the calculation amount is reduced for the randomization process in the later period.

Drawings

FIG. 1 is a schematic view of the structure of an artificial joint coating of the present invention;

FIG. 2 is a schematic view of a parallelepiped frame structure according to the present invention;

FIG. 3 is a schematic structural diagram of the external node in FIG. 2 after position transformation;

FIG. 4 is a schematic structural view of a unit body with a net wire according to the present invention;

FIG. 5 is a schematic diagram of the unit structure of FIG. 4 after transformation of the positions of the inner nodes;

FIG. 6 is a schematic diagram of the structure of the unit body of FIG. 5 after the position of the outer node is transformed;

fig. 7 is a schematic structural view (plane) of the circumscribed rectangle SBB of the three-dimensional model S of the present invention;

FIG. 8 is a schematic representation of a cubic three-dimensional model organization formed by data models in accordance with the present invention;

fig. 9 is a partially enlarged view of fig. 8.

In the figure, 1, a three-dimensional model S; 2. a rectangle SBB is externally connected; 3. an individual; 3-1, ridge line; 3-2, mesh; 3-3, outer nodes; 3-4, inner nodes.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

As shown in fig. 1 to 6, an artificial joint coating structure comprises a coating body, wherein the coating body is of a three-dimensional net structure, and the three-dimensional net structure comprises nodes and net wires connected between the adjacent nodes.

The three-dimensional mesh structure comprises a plurality of units 3 which are connected with each other, the outer contour of each unit 3 is of a six-sided frame structure, the nodes comprise outer nodes 3-3 and inner nodes 3-4, 8 vertexes of the six-sided frame structure are the outer nodes 3-3, and one inner node 3-4 is arranged in the six-sided frame; the net silk 3-2 is a connecting line of each outer node 3-3 and each inner node 3-4 of the unit, and the outer nodes 3-3 of the corresponding surfaces of the adjacent units 3 are overlapped.

For ease of presentation, the six-sided frame structure is shown with a ridge (dashed line) 3-1. Wherein the solid line is mesh 3-2. As shown in FIG. 1, it can be seen that the three-dimensional network structure comprises a plurality of unit cells as shown in FIG. 4, wherein the ridge (dotted line) 3-1 is only for expressing the unit cell profile.

The positions of the inner nodes 3-4 are determined by offsets obtained through random function operation.

The outer contour of the unit 3 is in a parallel six-face frame structure or a non-parallel six-face frame structure. The unparallel six-face frame structure is formed by calculating one or more outer nodes 3-3 of the parallel six-face frame structure through a random function to obtain an offset and moving the position according to the offset. When the coordinates of the outer nodes 3-3 are changed, the corresponding net wires are changed, and a non-parallel six-sided frame structure is formed.

The parallelepiped frame structure includes a regular hexahedral frame structure.

When the specific random function is operated, the deviation percentage is limited, and the deviation percentage can be-60% to + 60% of the side length of the unit body. Namely, the maximum offset is plus or minus 60 percent of the side length of the unit body, namely, the increase or decrease of the coordinate value of each dimension of each vertex is 60 percent of the maximum side length of the unit body.

The utility model discloses can implement through 3D printing means. A 3D print data model is first produced. As shown in fig. 7, for the purpose of assisting the explanation of the forming process of the present invention, it is assumed that the coating body is spherical and a plan view is taken for clear observation for the convenience of understanding. Firstly, establishing a three-dimensional model in a computer according to the structure of the coating body S1; the three-dimensional model contour is the contour of the coating to be formed; secondly, calculating an external rectangle SBB2(S BoundingBox) of the three-dimensional model S1; dividing the SBB into a plurality of parallel six-sided frames which are distributed in a three-dimensional manner, wherein each six-sided frame is a unit 3, each unit 3 comprises 12 ridge lines, 8 outer nodes 3-3 and 1 inner node 3-4, a connecting line of the outer node and the inner node of each unit 3 forms the mesh, and the inside of the SBB presents a three-dimensional mesh structure; and finally, storing the position coordinates of each external node, each internal node and each mesh wire in the three-dimensional model S1 to form modeling data, namely completing the construction of the 3D printing data model.

When the artificial joint coating is printed by 3D, the 3D printer can print the prosthesis coating which forms a three-dimensional net structure layer by layer only by taking the modeling data as a three-dimensional model and processing the three-dimensional model layer by layer according to a plane.

As shown in fig. 8 and 9, a schematic diagram of a cubic three-dimensional model organization structure formed by the data model of the present invention; and a partially enlarged view.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. The utility model provides an artificial joint coating structure, includes the coating body, its characterized in that, the coating body is three-dimensional network structure, three-dimensional network structure includes node and the net silk of connection between adjacent node, the coating body is made through 3D printing.

2. The artificial joint coating structure according to claim 1, wherein the three-dimensional net structure comprises a plurality of units connected with each other, the outer contours of the units are six-sided frame structures, the nodes comprise outer nodes and inner nodes, 8 vertexes of the six-sided frame structures are the outer nodes, and one inner node is arranged in the six-sided frame; the net silk is a connecting line of each outer node and the inner node of the unit, and the outer nodes of the corresponding surfaces of the adjacent units are overlapped.

3. The prosthetic joint coating structure of claim 2, wherein the position of the internal node is determined by an offset calculated by a random function.

4. The artificial joint coating structure according to claim 2 or 3, wherein the outer contour of the unit is in a six-sided parallel frame structure or a six-sided non-parallel frame structure; the unparallel six-face frame structure is formed by calculating one or more outer nodes of the parallel six-face frame structure through a random function to obtain an offset and moving the position.

5. The artificial joint coating structure according to claim 4, wherein the parallelepiped frame structure is a regular hexahedral frame structure.