The invention relates to a fixation device without suture on an opening of a ventricular wall, comprising: - a hollow main body having an outer surface (11), - a ring (15) received at a first end of the hollow body, ring (15) being movable along at least a portion of the outer surface (11) of the hollow body, - a tubular membrane (16) covering the outer surface (11) of the hollow body extending between said ring ( 15) and the second end of the hollow body, - a distal end (17) of this tubular membrane (16), placed on the side of this second end, being self-expanding between a first configuration in which it has a tubular shape, and a second configuration in which it defines a first flange (18) extending radially from the hollow body, the other end of this tubular membrane (16) being capable of being deformed by the displacement of said ring (15)； ) so as to form a retaining flange (20) whose position may vary with respect to said first (18) flange so as to fit ventricular walls of different thicknesses, - said retaining flange (20) being intended to come into contact with the opposite face of said ventricular wall so that said flanges and the assembly formed by the portion of the hollow body and the portion of the tubular membrane (16) covering it, passing through said ventricular wall through said opening, block in position said fixing device in said opening.L'invention concerne un dispositif de fixation sans suture sur une ouverture d'une paroi ventriculaire, comprenant : - un corps principal creux présentant une surface (11) externe, - une bague (15) reçue à une première extrémité du corps creux, cette bague (15) étant mobile le long d'au moins une partie de la surface (11) externe du corps creux, - une membrane (16) tubulaire recouvrant la surface (11) externe du corps creux en s'étendant entre ladite bague (15) et la seconde extrémité du corps creux, - une extrémité (17) distale de cette membrane (16) tubulaire, placée du côté de cette seconde extrémité, étant a
