The present invention provides a method of making a leaflet assembly, the leaflet assembly thus made and a prosthetic valve. The leaflet assembly can take a first form wherein the valve is open and a second form wherein the valve is closed, the valve comprising a leaflet assembly having at least one leaflet attached to a supporting element, the leaflet having a free margin that can move between a first position wherein the valve takes the first form and a second position wherein the valve takes the second form, the method comprising providing a textile structure, and forming the leaflet assembly from the textile structure, such that a selvedge of the textile structure forms the free margin of the leaflet, wherein the textile structure is made by weaving warp and fill threads into a two-layer woven fabric having two stacked and interconnected layers, the two layers having selvedges at one longitudinal edge, and wherein forming the leaflet assembly comprises connecting two lateral edges of a single piece of the fabric to make a substantially tubular structure wherein the inner layer forms the leaflet and the outer layer forms the supporting element. With this method a prosthetic valve can be made with little process variability and errors, and resulting in a valve with high reliability and durability.La présente invention concerne un procédé de fabrication d'une valve prothétique qui peut prendre une première forme dans laquelle la valve est ouverte et une deuxième forme dans laquelle la valve est fermée, la valve comprenant un ensemble de feuillet ayant au moins un feuillet attaché à un élément de support, le feuillet ayant une marge libre qui peut se déplacer entre une première position dans laquelle la valve prend la première forme et une deuxième position dans laquelle la valve prend la deuxième forme, le procédé comprenant la fourniture d'une structure textile, et la formation de l'ensemble de feuillet à partir de la structure textile, de sorte qu'une bordure de
