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Transcatheter aortic valve implantation is considered an alternative for patients at high risk for conventional surgery. The Direct Flow Medical aortic valve (Direct Flow Medical, Inc, Santa Rosa, Calif) is a nonmetallic tissue valve prosthesis intended to treat patients with severe aortic stenosis at high risk for surgery.

journal of thoracic and cardiovascular surgery

Six-month results of a repositionable and retrievable pericardial valve for transcatheter aortic valve replacement: The Direct Flow Medical aortic valve