Restenosis is a complex biological process. The promise of drug-eluting stents is that the stent scaffolding is designed to mitigate the mechanical components of the restenotic process, while the drug coating attacks the underlying biological mechanisms of restenosis.
Erasmus MC: University Medical Center Rotterdam

Serruys, P., & Veldhof, S. (2001). The multi-link TETRA D™ drug-eluting coronary stent system. In Handbook of Coronary Stents, Fourth Edition (pp. 322–325). Retrieved from