WARREN, N.J.--(BUSINESS WIRE)--A randomized clinical trial comparing the Conor Sirolimus-eluting Coronary Stent, a new cobalt chromium reservoir-base stent design, to the Taxus Liberte Paclitaxel-eluting Coronary Stent has begun according to Conor Medsystems, LLC and Cordis Corporation, the sponsors of the study.