 The purpose of this study is to evaluate the long-term safety and efficacy of the XactTM Rapid Exchange Carotid Stent System used in conjunction with the Emboshield Pro Rapid Exchange Embolic Protection System Generation 5 and the Emboshield BareWireTM Rapid Exchange Embolic Protection System Generation 3, in the treatment of atherosclerotic carotid artery disease in high-surgical risk subjects. 