High-strength small-bore metal bone trabecula and preparation method of same

Abstract

The invention provides a high-strength small-bore metal bone trabecula and a preparation method of the same. The high-strength small-bore metal bone trabecula is made through overlapping of a plurality of basic units, wherein the basic unit has seamed edges and is solid, other parts have a hollow polyhedral structure, one face of one basic unit coincides with one face of an adjacent basic unit, and reinforced bars are disposed inside the basic unit. The invention also provides a method to prepare the metal bone trabecula, which comprises the steps: 1. modeling is completed; 2. sectioning is completed; 3. a base plate is pre-heated; 4. powder is pre-heated; 5. areas are selected for melting and scanning; 6. the fourth and the fifth steps are repeated to obtain a 3D printing part; 7. residual powder is removed; and 8. electrochemical corrosion is carried out to obtain the high-strength small-bore metal bone trabecula. The high-strength small-bore metal bone trabecula provided by the invention has compression strength of 60 MPa-90 MPa, and effective aperture of 100 mum-150 mum, wherein the aperture is reduced by over 50% and the compression strength increases by over 20% in comparison with those of a conventional 3D printing porous material. The high-strength small-bore metal bone trabecula provided by the invention is more beneficial for bone in-growth and cell growth.

Description

technical field [0001] The invention belongs to the technical field of biomedical materials, and in particular relates to a high-strength small-diameter metal bone trabecular and a preparation method thereof. Background technique [0002] In the field of treatment and repair of bone diseases such as fractures or osteonecrosis, especially in the treatment and repair of load-bearing bones, surgery to replace dead bones with implants is a common method to prevent further deterioration of bone diseases, avoid later fractures and even disability. Useful ways. At present, common implants mainly include autologous bone, allogeneic bone, bioceramics, organic polymers, degradable materials, and metal materials. Metal materials, such as stainless steel, Co-Cr-based alloys, titanium-based alloys, etc., have been widely used clinically because they can provide good mechanical properties, as well as have both corrosion resistance and biocompatibility. [0003] However, since the modulu...

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Problems solved by technology

[0005] At present, various 3D printing porous titanium alloy materials on the market, their porous structures are superimposed by a simple array of hexahedrons, cylinders, and cones as base units, which is quite different from the porous structure of human bone in the true bionic sense, and in porous materials There is uneven distribution of porous structure on the curved surface, which affects the consistency of bone ingrowth

At the same time, as the porosity of porous materials increases and the pores become thinner, the mechanical properties also decrease, making it difficult to meet the mechanical properties requirements of trabecular bone (>50MPa); limited by the accuracy and cleanliness of the 3D printing equipment itself. Powder requirements, the current 3D printing porous materials usually have a large pore size, about 300-1500 μm in diameter, which is obviously too open for the average cell diameter of 20-30 μm, and cells can only grow on the two-dimensional space of the pore wall, which cannot be realized. Three-dimensional growth in the entire hole, and then it is impossible to achieve sufficient bone growth into the scaffold

Metal powder cannot be eliminated in the human body, causing great harm to the human body after deposition. However, the smaller the pore size and the more complex the pore structure of the 3D printed porous material, the higher the possibility of metal powder remaining inside the porous structure, which is very easy to increase implantation. Risks and pitfalls of surgery and postoperative

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