Open-pore structure biomedical zinc material with aperture gradient distribution and preparation method thereof

Abstract

The invention discloses an open-pore structure biomedical zinc material with aperture gradient distribution and a preparation method thereof. The material is pure zinc or zinc alloy, wherein open pores which are mutually communicated in the surface and the inner part of the material, and the inner diameters of the open pores are in gradient distribution along an axial direction or a radial direction; the preparation method comprises the following steps: (1) preparing a pore-forming particulate matter, and dividing into macropore, mesopore and micropore particles according to particle size; (2)filling a graphite crucible with the particles, and arranging according to a needed shape and open-pore distribution manner; (3) putting a weight on the particles, and sintering to obtain a preform;(4) putting pure zinc or zinc alloy to replace the weight, vacuum melting, and enabling melt to flow into a gap; (5) introducing argon, and performing pressurized percolation; (6) removing the preformcomponent in a complex. According to the zinc material, the open pores thereof are of a mutually communicated structure, the porosity, aperture, open-pore shape and product corrosion rate are controllable, and the zinc material with layered gradient distribution and radial gradient distribution of aperture is hardly free of pore obturation and pore forming agent residual phenomena.

Description

technical field [0001] The invention belongs to the technical field of biomedical materials, and in particular relates to a biomedical zinc material with an open-pore structure and a preparation method thereof. Background technique [0002] At present, biomedical metal materials can be divided into two categories: one is non-degradable medical metal materials, mainly including: medical stainless steel, titanium and titanium alloys, cobalt-based alloys, rare refractory and precious metals, shape memory metals, etc.; It is a degradable medical metal material, mainly including: magnesium and magnesium alloys, iron-based alloys, etc. [0003] Although the first type of materials have good corrosion resistance and can remain stable for a long time after being implanted into the human body, they also bring some problems, such as the need for a second operation to remove them, which brings secondary pain and economic burden to the patient; The metal ions released by some alloying ...

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Problems solved by technology

[0003] Although the first type of materials have good corrosion resistance and can remain stable for a long time after being implanted into the human body, they also bring some problems, such as the need for a second operation to remove them, which brings secondary pain and economic burden to the patient; The metal ions released by some alloying elements also bring potential harm and other adverse effects to the human body

[0004] In the second category of biodegradable medical metal materials, currently clinically widely researched and applied mainly include two categories: magnesium and magnesium alloys, iron and iron alloys, but these two types of bioalloys also have obvious defects; magnesium and magnesium alloys also have obvious defects. The biggest problem of magnesium alloy is that its degradation rate is too fast and a large amount of hydrogen gas is generated during the degradation process, which affects its biocompatibility and thus affects its mechanical properties during use; while the degradation rate of iron and iron alloys is too slow, it will cause A series of biocompatibility issues; in addition, the ferromagnetism will seriously affect the imaging effect of medical devices

[0006] At present, most researchers use powder sintering technology to manufacture porous materials; in the technology of improving the porosity and permeability of porous materials, pore-forming agents are generally used; because the particle shape of most pore-forming agents is not uniform, Therefore, after sintering, the uniformity of the pore type and the connectivity of the pores cannot be guaranteed; on the other hand, the pores of the real bone should show a gradient change; however, so far, there is no research on porous gradient zinc biomaterials as bone. Research Reports on Tissue Substitute Materials

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