Early Feasibility Study (EFS) of Abbott's Balloon-expandable (BE) TAVI System for the Treatment of Severe, Symptomatic Aortic Stenosis

Inclusion Criteria: * Subject is at least 18 years of age * Subject is able and willing to return for required follow-up visits and assessments * Degenerative severe aortic valve stenosis of the native aortic valve with echo-derived criteria Exclusion Criteria: * Pregnant or nursing subjects * Life expectancy for a condition other than aortic stenosis is less than 2 years * Presence of other anatomic or comorbid conditions * Incapacitated individuals * Evidence of an acute myocardial infarction * Untreated clinically significant coronary artery disease requiring revascularization * Liver failure * Severe mitral regurgitation or severe mitral stenosis * etc.