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Zn-Mg and Zn-Cu alloys for stenting applications:From nanoscale mechanical characterization to in vitro degradation and biocompatibility

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Bioactive Materials 2021年第12期6卷 4430-4446页

作者： claudia garcía-mintegui Laura Catalina Córdoba Judit Buxadera-Palomero Andrea Marquina Emilio Jiménez-Piqué Maria-Pau Ginebra JoséLuis Cortina Marta Pegueroles Biomaterials Biomechanics and Tissue Engineering GroupDepartment of Materials Science and EngineeringTechnical University of Catalonia(UPC)Barcelona East School of Engineering(EEBE)08019BarcelonaSpain Resource Recovery and Environmental Management Group UPCEEBE08019BarcelonaSpain Barcelona Research Center in Multiscale Science and Engineering UPCEEBE08019BarcelonaSpain Institute for Bioengineering of Catalonia(IBEC) 08028BarcelonaSpain Structural Integrity Micromechanics and Reliability of Materials GroupDepartment of Materials Science and EngineeringUPCEEBE08019BarcelonaSpain

In the recent decades,zinc(Zn)and its alloys have been drawing attention as promising candidates for bioresorbable cardiovascular stents due to its degradation rate more suitable than magnesium(Mg)and iron(Fe)***,its mechanical properties need to be improved in order to meet the criteria for vascular *** work investigates the mechanical properties,biodegradability and biocompatibility of Zn-Mg and Zn-Cu alloys in order to determine a proper alloy composition for optimal stent *** measurements are performed to characterize the mechanical properties at the nanoscale as a function of the Zn microstructure variations induced by *** biodegradation mechanisms are discussed and correlated to microstructure,mechanical performance and bacterial/cell *** of Mg or Cu alloying elements refined the microstructure of Zn and enhanced yield strength(YS)and ultimate tensile strength(UTS)proportional to the volume fraction of secondary ***-1Mg showed the higher YS and UTS and better performance in terms of degradation stability in Hanks’***-Cu alloys presented an antibacterial effect for *** controlled by diffusion mechanisms and by *** was dependent on the degradation rate and the nature of the corrosion products.

关键词： Zinc alloys Bioresorbable metals Galvanic corrosion Nanoindentation Biocompatibility

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