Abstract
Prosthetic heart valves may be mechanical or bioprosthetic. Mechanical valves, which are composed primarily of metal or carbon alloys, are classified according to their design as ball-caged, single-tilting-disc, or bileaflet-tilting-disc valves (Fig. 9.1). In ball-caged valves, the occluder is a sphere that is contained by a metal “cage” when the valve is in its open position, and fills the orifice when the valve is in its closed position. In single-tilting-disc valves, the occluder is a single circular disc that is constrained in its motion by a cage, a central strut, or a slanted slot in the valve ring; therefore, it opens at an angle less than 90° to the sewing ring plane. In bileaflet-tilting-disc valves, the two occluders are two semicircular discs that open forming three orifices–a central one and two lateral ones.
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Badano, L.P., Sicari, R. (2010). Heart Valve Prostheses. In: Zamorano, J.L., Bax, J.J., Rademakers, F.E., Knuuti, J. (eds) The ESC Textbook of Cardiovascular Imaging. Springer, London. https://doi.org/10.1007/978-1-84882-421-8_9
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