Implantation of multiple overlapping stents is a common procedure used in the treatment of long vascular lesions.  Still, most corrosion tests only assess the simple corrosion resistance of a single stent, which leaves unaddressed the important issues of fretting and crevice corrosion resulting from overlapped stents.  For most stent materials, which rely on an oxide layer to prevent corrosion, fretting may damage the protective oxide layer and affect the material corrosion resistance.  Gaps created between two stents may lead to crevice corrosion, which may also affect the corrosion resistance of the devices.  The goals of this study are to assess the effect of fretting and crevice corrosion on Nitinol and stainless steel stents.  Fretting between the stents is first generated through in vitro fatigue tests of overlapped stents.  The extent of fretting will be investigated with observations of the fretted surfaces, metal loss measurements, and potentiodynamic polarization tests of overlapped stents after fretting.