Biodegrable pure Zn stent decorated with lanthanide doped cerium oxide
coating toward engineering to improve corrosion resistance and
antioxiant cardial patch
Abstract
Zn alloy stent has become a promising implantable cardiac patch stent.
However, traditional Zn alloy stents not only easily induce neointimal
hyperplasia, but also cannot improve reperfusion ischemia after
myocardial infarction. Here, the Yb/Er/CeO 2 coating
grow on the surface of Zn substrate, which inhibits the release of Zn
2+ and enhances the proliferation of vascular
endothelial cells. This layer improves re-endothelialization and
avoiding restenosis. Yb/Er/CeO 2 coating generates the
transition from the valence band to conduction band under 980 nm
excitation, which forms transfer energy of photo-induced electron-hole
pairs. This transfer energy can catalyze H 2O and O
2 to generate a chemical link group, which accelerate
the deposition rate of drug-eluting coating PLGA and increase the
corrosion resistance of Zn stents. Particularly, the Yb/Er/CeO
2 coating exhibits good catalytic ability for active
oxygen species (ROS), which can effectively scavenge myocardial cells
damage. Yb/Er/CeO 2 nanoparticles layer (Nps) improve
mitochondrial function and increases oxidative phosphorylation, which
achieves anti-damage effects. Zn@Yb/Er/CeO 2/PLGA can
serve as an excellent myocardial patch scaffold for repairing damaged
myocardial cells, which has promising applications in the treatment of
cardiovascular diseases.