A transcatheter aortic valve device (100), comprising: a main support valve leaflets (104) fixed inside the middle part of the main support and a skirt (102) that is fixed along the inner periphery of the main support and that is fixed to the valve leaflets (104). An upper flared structure (105) in a three-lobe pattern is formed on the upper end of the main support. Three top circular connection jaws (106) used for loading the main support are provided at the top of the upper flared structure (105). An outwardly-expanding lower flared structure (101) used for reducing paravalvular leak is provided on the lower end of the main support. Three bottom circular connection jaws (110) are provided at the bottom of the lower flared structure (101). The aortic valve device further comprises a positioning ring (103) that is located on the lower side of the main support and that is used for positioning. The positioning ring (103) comprises three V-shaped or U-shaped arc sections. The end portions of the V-shaped or U-shaped arc sections are connected to each other to form a ring, and three circular positioning connection jaws (111) are formed on the end portions. The bottom circular connection jaws (110) are respectively connected to the corresponding circular positioning connection jaws (111) by means of flexible positioning lines (107).Linvention concerne un dispositif de valvule aortique transcathéter (100), comprenant : un support principal des feuillets valvulaires (104) fixés à lintérieur de la partie médiane du support principal et une jupe (102) qui est fixée le long de la périphérie interne du support principal, ainsi quaux feuillets valvulaires (104). Une structure évasée supérieure (105) à motif trilobé est présente sur lextrémité supérieure du support principal. Trois mâchoires (106) circulaires supérieures de connexion utilisées pour le chargement du support principal sont disposées au sommet de la structure évasée supérieure (105). Une structure évasée inférieu
