A bicuspid valve prosthesis (10), a tricuspid valve prosthesis, and a stent (100) therefor. The stent (100) is used to support a heart valve of the bicuspid valve prosthesis (10). The stent (100) is in a contracted state for delivery and in an expanded state for deployment. The stent (100) comprises an inflow channel (110), a transition zone (120), and an outflow channel (130) in an axial direction, and the two ends of the transition zone (120) are respectively connected to the inflow channel (110) and outflow channel (130). In the expanded state, the inflow channel (110) is located upstream of a blood flow direction in the outflow channel (130). The radial stiffness of the inflow channel (110) is less than the radial stiffness of the outflow channel (130) and/or the transition zone (120). Because of the lower radial stiffness of the inflow channel (110) its morphology can favorably adapt to the morphology of a native bicuspid valve, reduce oppression and interference to an aortic valve, and significantly reduce the risk of obstruction of a left ventricular outflow tract. Moreover, during a release process, the morphology of the inflow channel (110) can be easily adjusted to adapt to changes in the diameter of the stent (100) and radial deformation and axial turbulence during deployment of the cushioning stent (100), improving release stability.L'invention concerne une prothèse de valve bicuspide (10), une prothèse de valve tricuspide et une endoprothèse (100) correspondante. L'endoprothèse (100) est utilisée pour supporter une valve cardiaque de la prothèse de valve bicuspide (10). L'endoprothèse (100) est dans un état rétracté pour l'administration et dans un état déployé pour le déploiement. L'endoprothèse (100) comprend un canal d'entrée (110), une zone de transition (120) et un canal de sortie (130) dans une direction axiale et les deux extrémités de la zone de transition (120) sont respectivement reliées au canal d'entrée (110) et au canal de sortie (130). Dan
