Table 2.
Important properties of several biodegradable stent materials.
| Stent Material | Young’s Modulus (GPa) | Tensile Strength (MPa) | Elongation at Break (%) | Degradation (Months) | References |
|---|---|---|---|---|---|
| PLA | 2–4 | 65 | 2–6 | 18–30 | [99,100] |
| PDLLA | 1–3.5 | 40 | 1–2 | 3–4 | [99] |
| PLLA | 2–4 | 60–70 | 2–6 | >24 | [99] |
| PGA | 6–7 | 90–110 | 1–2 | 4–6 | [99] |
| PDLGA (50/50) | 1–4.3 | 45 | 1–4 | 1–2 | [99] |
| PLGA (82/12) | 3.3–3.5 | 65 | 2–6 | 12–18 | [99] |
| PCL | 0.34–0.36 | 23 | >4000 | 24–36 | [99] |
| PLA/PCL (70/30) | 0.02–0.04 | 2–4.5 | >100 | 12–24 | [99] |
| PC | 2–2.4 | 55–75 | 80–150 | >14 | [99] |
| AE21 | 45 | - | - | 2–3 | [78,101] |
| AE42 | 45 | 237 | 8–10 | - | [78] |
| WE43 | 40–50 | 220–330 | 2–20 | 3–12 | [99] |
| AZ31 | 45 | 235 | 7–21 | <4 | [78] |
Abbreviations: PLA—polylactic acid; PDLLA—poly-DL-lactic acid; PLLA—poly-L-lactic acid; PGA—polyglycolide; PDLGA—poly-DL-lactide-co-glycolide; PLGA—poly-lactic-co-glycolide; PCL—polycaprolactone; PLA/PCL—polylactic acid/polycaprolactone; PC—polycarbonates; AE21—magnesium alloy containing ~2% aluminum and ~1% rare earth metals; AE42—magnesium alloy containing ~4% aluminum and ~2% rare earth metals; WE43—magnesium alloy containing 4.2% yttrium, 2.4% neodymium, 0.6% cerium/lanthanum, and 0.5% zirconium; AZ31—magnesium alloy containing ~3% aluminum and ~1% zinc.