In vitro characterization of ZM21 mini-tube used for biodegradable metallic stent

摘要

Feasibility of a ZM21 mini-tube to be used as biodegradable stent applications was studied mainly focusing on its microstructure, mechanical property and corrosion behaviors. This mini-tube was composed of alpha-Mg, a small amount of Mn0.815Si0.185 and possibly some undissolved Mn. Compressive yield strength, ultimate compressive strength and compressive strain of this mini-tube were 86.5 +/- 4.9 MPa, 347.7 +/- 15.0 MPa and 10.9 +/- 0.4%, respectively. It exhibited decent corrosion resistance in Hank's solution with a degradation rate of 0.26 mm/y. ZM21 mini-tube exhibited great potential to be used as biodegradable stents. But before that, localized corrosion should be well solved through impurity control and microstructure control. (C) 2017 Elsevier B.V. All rights reserved.