The invention relates to an implant and a method for improving coaptation of an atrioventricular valve, the atrioventricular valve having a first native leaflet, a second native leaflet and an annulus. The implant comprises a support structure comprising an upper support element (17) to be arranged on a superior surface of the annulus or of the at least one native leaflet and a lower support element (18) to be arranged on an inferior surface of the annulus or of the at least one native leaflet, the upper and the lower support elements (17,18) each comprising connection means (32,33) cooperating which each other for interconnecting the upper and the lower support element (17,18) while clamping a section of the annulus or of the at least one native leaflet between the upper support element (17) and the lower support element (18), wherein at least one connection means (32,33) comprises a penetrating section configured to penetrate the annulus or the at least one native leaflet for being connected with the other connection means (32,33). The implant further comprises retention means (36,37) fixed to the support structure (16) so as to prevent prolapse of the at least one native leaflet.L'invention concerne un implant et un procédé permettant d'améliorer la coaptation d'une valvule atrioventriculaire, la valvule atrioventriculaire ayant un premier feuillet natif, un second feuillet natif et un espace annulaire. L'implant comprend une structure de support comprenant un élément de support supérieur (17) à disposer sur une surface supérieure de l'espace annulaire ou dudit feuillet natif, et un élément de support inférieur (18) à disposer sur une surface inférieure de l'espace annulaire ou dudit feuillet natif, les éléments de support supérieur et inférieur (17, 18) comprenant chacun un moyen de raccordement (32, 33) coopérant mutuellement pour relier les éléments de support supérieur et inférieur (17, 18) tout en serrant une section de l'espace annulaire ou dudit feuillet n
