MIAMI--(BUSINESS WIRE)--An investigational drug-eluting stent (DES) from Cook Medical showed sustained primary patency at two years compared to data collected at one year in the device’s prospective, randomized study, according to data presented today at the ISET 2010 International Symposium on Endovascular Therapy. The data, compiled from 479 patients enrolled in a randomized controlled trial being conducted to obtain U.S. Food and Drug Administration PMA clearance for the device, showed that patients receiving the self-expanding nitinol stent, which is coated with the drug paclitaxel, had 83.1 percent primary patency after 12 months. When evaluated at 24 months, the patency rate for the 278 patients tested from that cohort was 74.8 percent.