3D printing ankle joint prosthesis

Abstract

The invention discloses a 3D printing ankle prosthesis, and relates to the field of orthopedic medical instruments. The 3D printing ankle prosthesis comprises a supporting part and an elastic part, the supporting part comprises a body part and a connecting part, the elastic part is fixedly connected with the connecting part, and the connecting part is formed by filling and stacking a porous structure. The connecting part is arranged on the outer surface of the body part. By the adoption of the technical scheme, the problem that in the prior art, friction between an ankle joint prosthesis and an affected part skeleton is too large is solved. Materials adopted by the elastic part comprise macromolecule polyethylene and silica gel, the surfaces of the elastic materials make contact with the skeleton, abrasion and infection are reduced, compared with a traditional metal ankle prosthesis, the technical effect that the using comfort and stability are improved is achieved, and rehabilitation is facilitated.

Description

Technical Field

[0001] The present invention belongs to the field of orthopedic medical devices and relates to a 3D printed foot and ankle joint prosthesis and a preparation method thereof. Background Art

[0002] At present, ankle replacement is one of the effective methods for treating primary and post-traumatic osteoarthritis, ankle and foot fractures, relieving severe pain caused by arthritis, stopping lesions, correcting ankle and foot deformities and maintaining their stability. After years of development, there are many types of ankle and foot replacement. The existing ankle and foot fusion fixation methods include screws, steel plates, intramedullary nails and external fixators.

[0003] Artificial joint prostheses are mostly made of cobalt-chromium-molybdenum alloys with excellent biocompatibility and wear resistance, but their density and elastic modulus far exceed those of natural biological bones, resulting in poor adaptability and easy stress shielding, which makes bone tissue growth lack stress stimulation and force conduction. At the same time, the metal surface has a high degree of wear on the affected bone, which has an adverse effect on long-term implantation. Therefore, it is necessary to improve the surface material of the ankle joint prosthesis to improve the adaptability and healing effect of the prosthesis.

[0004] In view of the deficiencies in the existing technology, the present invention develops a 3D printed foot and ankle joint prosthesis that is more in line with the biomechanical structure of the human body, has excellent adaptability, good bone ingrowth effect, high comfort in use and strong stability. Summary of the invention

[0005] In view of this, an embodiment of the present invention provides a 3D printed ankle joint prosthesis. To achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0006] A 3D printed ankle joint prosthesis, comprising:

[0007] A supporting portion, the supporting portion comprising a main body portion and a connecting portion;

[0008] an elastic portion, fixedly connected to the connecting portion;

[0009] The connection part is formed by filling and stacking the porous structure.

[0010] In a disclosed embodiment, the connecting portion is disposed on the outer surface of the main body.

[0011] In a disclosed embodiment, the porous structure includes support rods, and the support rods are filled and stacked in the main body so that support pores are formed between adjacent support rods.

[0012] In a disclosed embodiment, the fixing method of the elastic part and the connecting part includes: casting and curing.

[0013] In a disclosed embodiment, the support portion is printed and formed in one step by a metal 3D laser printing method.

[0014] In a disclosed embodiment, the material of the elastic portion includes high molecular weight polyethylene, silicone, and polyetheretherketone.

[0015] In a disclosed embodiment, the diameter of the support rod is between 50 and 1000 microns, and the pore size of the support pore is between 50 and 1000 microns.

[0016] According to the technical solution of the present invention, one embodiment of the above invention has the following advantages or beneficial effects:

[0017] The 3D printed ankle prosthesis solves the problem of excessive friction between the ankle prosthesis and the affected bone in the prior art. The elastic part is made of materials including high molecular polyethylene and silicone. The surface of these elastic materials is in contact with the bone, reducing wear and infection. Compared with the traditional metal ankle prosthesis, it improves the technical effect of comfort and stability, and is conducive to rehabilitation.

[0018] The further effects of the above-mentioned non-conventional optional manner will be described below in conjunction with the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to better understand the present invention and do not constitute an improper limitation of the present invention.

[0020] Figure 1 It is a structural diagram of a 3D printed foot and ankle joint prosthesis of the present invention;

[0021] Figure 2 is a cross-sectional view of a 3D printed foot and ankle joint prosthesis of the present invention;

[0022] Figure 3 It is a cross-sectional view of a 3D printed ankle joint prosthesis of the present invention.

[0023] Description of reference numerals:

[0024] 1-support part, 2-elastic part, 10-main body, 11-connecting part, 21-porous structure, 211-support rod, 212-support Porosity. DETAILED DESCRIPTION

[0025] In order to better illustrate the present invention and facilitate understanding of the technical solution of the present invention, the present invention is further described in detail below. However, the following embodiments are only simple examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

[0026] The specific implementation of the present invention provides a 3D printed ankle joint prosthesis, including:

[0027] The support part 1 includes a main body part 10 and a connecting part 11;

[0028] The elastic part 2 is fixedly connected to the connecting part 11;

[0029] The connection portion 11 is formed by filling and stacking the porous structure 21 .

[0030] Please combine Figures 1 to 3 In this embodiment, the connecting portion 11 is disposed on the outer surface of the main body 10 .

[0031] The porous structure 21 includes support rods 211, which are filled and stacked in the main body 10 to form support pores 212 between adjacent support rods 211. Specifically, the elastic modulus of the porous structure 21 is closer to human bones than the existing full-entity ankle joint prosthesis while ensuring sufficient strength, so that bone fusion can be effectively promoted. The support pore 212 is an irregular polygonal structure, such as an irregular quadrilateral, pentagon, hexagon, etc. In this embodiment, the pore size of the porous structure 21 can be adjusted according to actual needs through the diameter and density of the support rod 211, which is easy to operate and easy to implement. The support rod 211 and the support pore 212 are printed and formed at one time by a metal 3D laser printing method. Thereby, the shape and size can be customized according to the different needs of the patient to achieve personalized matching of the ankle joint prosthesis.

[0032] The fixing method of the elastic part 2 and the connecting part 11 includes: casting and curing.

[0033] The support portion 1 is printed and formed in one step by a metal 3D laser printing method.

[0034] The material of the elastic part 2 includes high molecular weight polyethylene, silicone, and polyetheretherketone.

[0035] The diameter of the support rod 211 is between 50 and 1000 microns, and the pore size of the support pore 212 is between 50 and 1000 microns.

[0036] On the one hand, while ensuring that the intervertebral fusion cage has sufficient strength, the elastic modulus of the ankle prosthesis is made as close as possible to the elastic modulus of real human bones.

[0037] In this way, it is easy to understand that when the 3D printed ankle prosthesis is placed at the ankle joint, the elastic part of the 3D printed ankle prosthesis contacts the bone, reducing wear and infection. Compared with traditional metal ankle prostheses, it improves the technical effects of comfort and stability, and is conducive to rehabilitation.

[0038] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A 3D printed ankle prosthesis, characterized in that: include: A supporting portion (1) comprising a main body portion (10) and a connecting portion (11); An elastic portion (2) fixedly connected to the connecting portion (11); The connecting portion (11) is formed by filling and stacking the porous structure (21).

2. The 3D printed ankle joint prosthesis according to claim 1, characterized in that: The connecting portion (11) is arranged on the outer surface of the main body (10).

3. The 3D printed ankle joint prosthesis according to claim 2, characterized in that: The porous structure (21) comprises support rods (211), and the support rods (211) are filled and stacked in the main body (10) so that support gaps (212) are formed between adjacent support rods (211).

4. The 3D printed ankle joint prosthesis according to claim 3, characterized in that: The fixing method of the elastic part (2) and the connecting part (11) includes: casting and curing.

5. The 3D printed ankle joint prosthesis according to claim 4, characterized in that: The support portion (1) is printed and formed in one go using a metal 3D laser printing method.

6. The 3D printed ankle joint prosthesis according to claim 5, characterized in that: The material of the elastic part (2) includes high molecular weight polyethylene, silicone and polyetheretherketone.

7. The 3D printed ankle joint prosthesis according to claim 6, characterized in that: The diameter of the support rod (211) is between 50 and 1000 microns, and the pore size of the support pore (212) is between 50 and 1000 microns.

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