the disclosed prosthesis for replacement of the bicuspid or mitral valve in the left auriculo - ventricular aperture , or of the tricuspid valve in the right auriculo - ventricular aperture , is fitted to a semi - rigid ellipsoidal and reniform support which imitates the biological shape of the original organ . the moving part of the valve is fashioned from a single piece of biological , bio - compatible or polymeric material , and fabricated such that the sub - valve section is supported by two &# 34 ; suspenders &# 34 ; in order to ensure a singularly biological type of operation , with no drop in pressure incurred during the opening movement , and with minimal regurgitation during the closing movement .