| http://www.w3.org/ns/prov#value | - The internal cover makes a sort of ???sleeve??? at least below the fastening of the valvular structure covering the internal surface of the frame and thus prevents any regurgitation of blood through the frame. [0037] In the present invention, the frame is a substantially cylindrical structure capable of maintaining said body channel open in its expanded state and supporting said collapsible valvul
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