A self-expanding medical device is shown for paravalvular leak closure, comprising a flexible, braided structure composed of many metal strands, having in its free state a fixed, unfolded form with a developed shape, deformable to a form with a smaller cross-section than the unfolded form, wherein the device has a proximal end and a distal end and both ends include elements grouping and fixing the ends of the metal strands, characterised in that the unfolded form comprises three parts having a developed surface, a distal part (1), a proximal part (2) and a middle part (5) between them with a cross-section smaller than the cross-sections of the distal (1) and proximal (2) parts, wherein the said three parts (1, 2, 5) are separated by narrowings of the braided structure, in the form of connecting elements (3, 4) with a cross-section smaller than the cross-section of these three parts (1, 2, 5), wherein each of the parts (1,2,5) is spatially shaped so that in each of them, in a free unfolded state, the distal wall and the corresponding proximal wall do not contact each other.
