2.1
Transcatheter heart valves are used for a transcatheter aortic valve implantation (TAVI) procedure, when a narrowed native aortic valve or a failed bioprosthetic valve is replaced through a blood vessel in the leg or chest. Transcatheter heart valves consist of a stent frame and animal pericardium tissue leaflets. The valves vary in physical characteristics such as the alloy of the frame, the type of tissue of the leaflets and the available valve sizes. They also vary in technical characteristics such as the expansion mechanism, the presence of locators or anchors and the valve positioning relative to the native aortic valve.
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