Abstract
The mechanical valves are the biggest single group of prostheses for valve replacement in the mitral position. Though the mechanical valves and bioprosthetic valves show different hydrodynamic advantages and disadvantages, none of these different valve types is superior in all hydrodynamic criteria Basically two different types of mechanical heart valves, tilting disc valves and bileaflet valves are available for valve replacement. The aim of this study is to determine the effectiveness of the two different models of mechanical bileaflet valves available for valve replacement: St. Jude Medical and Duromedics. Altogether 10 mechanical bileaflet valves, 5 St. Jude Medical and 5 Duromedics, with different sizes from No. 21 to No. 29 have been perfused in the mitral position of a mock circulation under pulsatile flow conditions.
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