Objective To evaluate the feasibility and early stage effect of transcatheter aortic valve implantation in sheep by the novel self-expanding ultramicroporous expanded polytetrafluoroethylene(ePTFE) prosthetic valve. Methods The novel polymeric trileaflet transcatheter aortic valve with a self-expanding stent was designed, and valve leaflet was made of 0.1 mm ultramicroporous ePTFE. Polymeric aortic valves were implanted in situ by left ventricular apical approach in 10 male healthy sheep with body weight of...