Evaluation of the BARD® True™ Flow Valvuloplasty Perfusion Catheter for Aortic Valve Dilatation

Inclusion Criteria: * The subject voluntarily provides written informed consent prior to the collection of study-specific data or performance of study-specific procedures using an Informed Consent Form (ICF) that is reviewed and approved by the Ethics Committee (EC) for the site. * The subject is a male or non-pregnant female ≥ 18 years old. * The subject is undergoing TAVI for treatment of aortic stenosis. * The subject has an annulus diameter that can be treated with the available size device, in accordance with the Instructions For Use (IFU). Exclusion Criteria: * The patient is unable or unwilling to provide written informed consent. * The patient has a known allergy or sensitivity to contrast media that cannot be adequately pre-medicated. * The patient has had previous aortic valve replacement. * The patient has a known congenital aortic valve abnormality (e.g., bicuspid aortic valve). * The patient has echocardiographic evidence of intracardiac mass, or thrombus. * The patient has vascular conditions that make insertion and endovascular access to the aortic valve impossible. * The patient has another medical condition, which, in the opinion of the Investigator, may cause him/her to confound the data interpretation, or is associated with a life expectancy insufficient to allow for the completion of study procedures. * The subject is currently participating in an investigational drug, biologic, or another device study that has not completed the study treatment or that clinically interferes with the objectives of the study.