A manufacturing method of laser additive manufacturing-high temperature vacuum sintering porous tantalum bone implant prosthesis with bone-imitation trabecular structure

Abstract

The invention discloses a manufacturing method of a porous tantalum bone implanted prosthesis with a medical imitation trabecular structure manufactured by laser additive manufacturing. The method includes the following steps: using CT scanning data to establish a three-dimensional figure of the bone defect prosthesis, using software to convert the figure of the bone defect prosthesis into a porous shape with a porosity of 60-85% and imitating bone trabecula; designing a support, which is sufficient to form a base plate and The printed implants are firmly connected, and it is easy to manually remove the printed implants from the printed substrate after printing; then the ultra-high temperature vacuum sintering heat treatment method is used to reduce the Oxygen content and stress relief to obtain qualified human implant prostheses. The invention avoids the pollution of the porous tantalum implant prosthesis by wire cutting, reduces the oxygen content of the porous tantalum implant prosthesis, and connects conventional processes in series to form a unique laser additive manufacturing-high temperature vacuum sintering The manufacturing method of medical porous tantalum implanted bone prosthesis with imitation trabecular structure is a complete process manufacturing method.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and furthermore, the invention relates to a manufacturing method of laser additive manufacturing-high-temperature vacuum sintering medical bone imitation trabecular structure porous tantalum bone implant prosthesis. Background technique [0002] Compared with titanium alloy and cobalt-chromium alloy, tantalum has the advantage of not containing toxic and harmful metal elements, and has the biological advantages of inducing bone growth and anti-infection ability. It is recognized as the best metal material for bone repair in the medical field. The natural structure of human bones is called trabecular bone structure. The foreign traditional vapor deposition method to produce porous tantalum implants with bone trabecular structure for human implants has monopolized the Chinese market. It has a fixed size and does not fit the shape and shape required by the patient. size. [0003] Due...

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Problems solved by technology

During the wire cutting process, the porous tantalum prosthesis will be contaminated by wire cutting oil, wire cutting coolant and cutting molybdenum wire. The subsequent cleaning process of human implants cannot completely eliminate these pollutions, or lead to the use of several different Complex method for cleaning, not conducive to industrial applications

[0005] (2) The problem of excessive oxygen content in the produced 3D printed metal tantalum: In the industry, vacuum heat treatment is usually carried out at a temperature of 1000-1200°C to eliminate the stress of tantalum products, and during the vacuum heat treatment process, the oxygen content of tantalum metal products will be Increased

For this reason, many people seek to control and reduce the oxygen content of laser printing raw material tantalum powder to be below 200ppm, which makes the production of laser printing raw material tantalum powder more difficult, the production efficiency of tantalum powder products is very low, and the cost is greatly increased. rise

[0006] (3) The existing production process is not a complete process for the production and manufacture of medical bone imitation trabecular structure porous tantalum bone implant prosthesis, and it is necessary to produce qualified medical human body imitation trabecular structure porous tantalum bone implant prosthesis production, and creatively perfect and improve the process method

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