Recent Progress on Mg- and Zn-Based Alloys for Biodegradable Vascular Stent Applications

Table 1

Criteria for biodegradable vascular stents.

Properties		Constraints
Mechanical properties [16, 17]	Yield strength	>200 MPa
	Ultimate tensile strength	>300 MPa
	Elongation	>15-18%
	Ratio of yield strength to elastic modulus	>0.16
	Elastic recoil on expansion	<4%
	Resistance to cyclic fatigue	>10-20 million cycles before failure
Degradation	Degradation period	Mechanical integrity: 3-6 months; Full absorption: 12-24 months [18]
	Degradation rate	[16, 17, 19]
Biocompatibility	Biocompatibility	Nontoxic, noninflammatory, and no allergenic potential [16, 17]