UniLine Atrioventricular - Heart Valve Bioprosthesis Pericardium stented mitral valve prosthesis. Leaflet biomaterial durability is supported by clinical data. The valve has been used in clinical practice since 2008. . Mitral Ring Covered with pericardium. Superelastic shape-memory material stent preserves physiologic flexibility of the reconstructed human heart mitral valve UniLine Atrioventricular Mitral Ring