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  • Biological cardiac valve prostheses manufactured using leaflets made of biological tissue that are intended for percutaneous transcatheter delivery to substitute the aortic valve function. These prostheses include leaflets made of sterilized tissue (usually the pericardial sac) harvested from bovine (i.e., cows) or equine (i.e., horse) animals and chemically processed; the leaflets are sewn into a metal frame stent. Aortic transcatheter delivered biological valves are available in several sizes and types, depending on the anatomic characteristics of the particular patient.
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