The invention relates to a heart implant comprising a tubular attachment element (1) for attaching an inflatable membrane (2), particularly an inflatable membrane (2) being coaxially positioned around the tubular attachment element (1) and fixed to it, the tubular attachment element (1) at one of its ends being split into several strips (4), the strips (4) extending away from the tubular attachment element (1) and forming an expandable cage (C), particularly for fixing the heart implant to the atrium of the heart by surface contact between an exterior surface of the expandable cage (C) and an interior atrium surface, each one of the strips (4) being split into two branches (4a, 4b, 4a, 4b,...), each respective branch (4a) being merged into a new strip (5) together with another respective branch (4b) of a neighboring strip (4) wherein such splitting and merging is performed one after the other at least three times and the number of strips (7) being formed of the last merged branches (6a, 6b) at the end of extension corresponding to the number of strips (4) at the one end of the tubular attachment element (1).Linvention concerne un implant cardiaque comprenant un élément de fixation tubulaire (1) pour fixer une membrane gonflable (2), notamment une membrane gonflable (2) positionnée de manière coaxiale autour de lélément de fixation tubulaire (1) et fixée à celui-ci, lélément de fixation tubulaire (1) étant, au niveau de lune de ses extrémités, divisé en plusieurs bandes (4), les bandes (4) se prolongeant depuis lélément de fixation tubulaire (1) et formant une cage extensible (C) servant, en particulier, à fixer limplant cardiaque à loreillette par contact superficiel entre la surface extérieure de la cage extensible (C) et la surface intérieure de loreillette, chacune des bandes (4) étant divisée en deux branches (4a, 4b, 4a, 4b,...), chaque branche distincte (4a) étant fusionnée en une nouvelle bande (5) avec une autre branche distincte (4b) dune bande voisine (4),
