Personalized hard tissue defect restoration body and manufacturing method thereof

Abstract

The invention provides a personalized hard tissue defect restoration body and a manufacturing method thereof. The personalized hard tissue defect restoration body provided by the invention is porous structure metal with a rough surface, and the appearance and the mechanical property of the personalized hard tissue defect restoration body are accurately matched with a hard tissue defect part of a patient. The manufacturing method comprises the following steps of firstly, designing a restoration body three-dimensional model according to the form and the mechanical property of the hard tissue defect part of the patient; then utilizing a selective laser melting rapid prototyping method to acquire a restoration body entity; carrying out annealing treatment to obtain the restoration body. The method is simple in processing step, short in period, high in material utilization rate, low in cost, and convenient for manufacturing of the hard tissue defect restoration body with a complex structure, and has more efficiency and economic advantages for the personalized design and quick manufacture of the restoration body. The manufactured restoration body is uniform in porosity and adjustable in pore diameter, has mutually penetrated and communicated holes, has the elastic modulus and the compressive strength being very close to those of the hard tissue, and can meet the biomechanical compatibility requirement required by biomedical materials.

Description

technical field [0001] The invention belongs to the technical field of medical devices for repairing hard tissue, and in particular relates to a personalized hard tissue defect prosthesis and a manufacturing method thereof. Background technique [0002] Metal materials have high toughness and strength, and are suitable for repairing hard tissue defects. They are the earliest biomaterials used. At present, medical metal materials and their products account for as high as 55% of the entire biomaterial products market. With the increase of clinical use of metal materials, the deficiencies of these materials are gradually exposed. The elastic modulus of metal is much higher than that of human hard tissues (bone and teeth, etc.), so that the load cannot be smoothly transmitted from the restoration to the adjacent parts. The phenomenon of "stress shielding" occurs, which causes stress absorption around the prosthetic, leading to loosening or fracture of the prosthetic, and failur...

AI Technical Summary

Problems solved by technology

Among them, the molding method is made of metal powder added with a pore-forming agent. The preparation process is simple and the structure is uniform, but the pore size is small, the porosity is low, and most of them are closed pores; although the slurry foaming method can obtain high-porosity Porous metals, but it is difficult to control the pore structure (such as pore size and shape, etc.) only through the addition of foaming agent; when the gel casting method is used to prepare porous metals, it is necessary to add various additives such as organic matter and dispersants, which not only pollutes environment, increase cost, and bring many problems to the subsequent removal process

In addition, the traditional preparation methods of porous metal require special molds, which are costly and cannot guarantee the forming accuracy. They are not suitable for single-piece or small-batch production, and it is impossible to obtain a porous structure restoration that accurately matches the shape of the hard tissue defect.

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