purchase of bio prosthetic valves on one year rate contract basis and further extendable upo 01 years purchase of bio prosthetic valves on one year rate contract basis and further extendable upo 01 years_1 , to consider purchase of bio-prosthetic valves on one year rate contract basis and further extendable upto 01 years. , bovine pericardial aortic valve for supra annular placement all sizes , dry storedaortic pericardial valves (all sizes) , dry storedaortic bovine pericardial valves (all sizes) , bovine pericardial mitral tissue valve for supra annular placement all sizses , bioprosthetic bovine pericardium aortic valve conduit , porcine tissue heart valve (mitral) all sizes , bio prosthesis stented porciene valve aortic sizes 19mm, 21mm, 23mm, 25mm, 27mm, 29mm mitral sizes 25mm, 27mm, 29mm, 31mm, 33 mm , porcine tissue heart vavle (aortic) all sizes , bovine pericardial interior mounted leaflet