Porous tantalum implant and method for preparing porous tantalum additive

Abstract

The embodiment of invention relates to a method for preparing a porous tantalum additive. The method for preparing the porous tantalum additive comprises the following steps that a three-dimensional model of a to-be-machined workpiece is constructed; slicing treatment is conducted on the three-dimensional model and sliced layer data are acquired, scanning path planning is conducted on the sliced layer data, and scanning path data are formed; the scanning path data are imported into electron beam selective melting equipment; powder grading is conducted on spherical tantalum powder, and spherical tantalum powder with apparent density greater than 9g / cm<3> is acquired; the oxygen content of the spherical tantalum powder is less than 150 ppm; and spherical tantalum powder with apparent densitygreater than 9g / cm<3> is loaded into the electron beam selective melting equipment, selective melting scanning is conducted on spherical tantalum powder according to the scanning path data, and a target workpiece is acquired. According to the method for preparing the porous tantalum additive disclosed by the embodiment of the invention, on the one hand, working procedures are simple, follow-up treatment is not needed, secondary pollution is avoided, and moreover, biological stability of the porous tantalum additive as a human body implant is high in long-term use; and on the other hand, porous tantalum prepared with the method is low in oxygen content, light in weight and high in compression strength and has outstanding plasticity.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of additive manufacturing, and in particular to a porous tantalum implant and a method for manufacturing porous tantalum additives. Background technique [0002] As the aging process accelerates and obesity rates increase, more and more people are developing osteoarthritis, requiring joint replacement surgery. Years after joint replacement surgery, prosthesis displacement, prosthesis infection, prosthesis loosening and sinking lead to osteolysis, etc., often occur, causing great pain to patients. Prosthesis revision surgery using filler blocks is a common practice in clinical practice. a means of treatment. [0003] Porous tantalum is currently recognized by the medical community as the most biocompatible hard tissue implant material. It has been clinically used for many years. More than 250 literatures have reported its excellent biocompatibility. More than 1 million cases of poro...

AI Technical Summary

Problems solved by technology

[0004] In the related art, some implants are prepared by using hydrodehydrogenated non-spherical tantalum powder as raw material. The implants prepared by this raw material have high oxygen content, and tantalum metal is very sensitive to oxygen, and the increase of oxygen content will lead to implants sharp drop in plasticity

There is a method of printing pure tantalum powder to the required implant size by laser selective melting technology, and then sintering at high temperature to obtain a porous tantalum implant whose mechanical strength and porosity meet the implantation requirements, but this method is complicated , accompanied by the use of a large number of additives, and the sintering process can easily lead to excessive oxygen, carbon, nitrogen and other impurity elements in the implant, which will reduce the biocompatibility of the implant and the stability of the implant during long-term use sex

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