MINNEAPOLIS--(BUSINESS WIRE)--Medtronic, Inc. (NYSE: MDT) today announced it has completed patient enrollment in the extreme risk study in its CoreValve U.S. Pivotal Trial. The company also received approval from the U.S. Food and Drug Administration (FDA) for an extended investigation (under the FDA’s Continued Access Policy) to continue enrolling extreme risk patients under a Continued Access Study protocol. In the Trial’s second study evaluating high risk patients for aortic valve surgery, enrollment completion is anticipated later this year.