Preparation method of bionic artificial bone with multistage [micrometer/nanometer] pore structure
A multi-level hole, artificial bone technology, applied in bone implants, medical science, prosthesis, etc., can solve problems such as single structure
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[0024] Using nano-hydroxyapatite powder and L-polylactic acid PLLA as raw materials, the HAP is long needle-shaped, about 150nm in length, about 20nm in width, and an average particle size of 40nm; PLLA has an average particle size of 10-100μm and a relative viscosity of 0.51-1.0 dl / g. A uniformly mixed PLLA / HAP powder raw material is obtained by a mechanical mixing method, wherein the mass fraction of PLLA is 10%. Based on the self-developed selective laser sintering system, PLLA / HAP powder is sintered and molded under the process conditions of laser spot diameter of 50μm and powder coating thickness of 0.2μm to obtain a stent green body, and then the green body is placed in a temperature-controlled furnace. Re-sintering, and remove PLLA in the green body by precisely controlling the furnace temperature curve. Then put the stent into a 10% hydrofluoric acid (HF) solution f...
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