Additional Study Information: This is a prospective, multicenter, non-randomized, single-arm, open-label clinical study, sponsored by Pi-Cardia. Fifteen (15) patients with symptomatic severe Aortic Stenosis (narrowing of the aortic valve) who are considered operable but are not recommended by the heart team for immediate treatment with surgical or transcatheter aortic valve replacement will be treated with the Leaflex Performer in up to 7 clinical sites. All enrolled patients will be followed up at 30 days and at 3, 6, 9, and 12 months post-procedure.