Abstract: The stent appears as a prismatic cage (3) of which the flat faces consist in a corresponding number of modular elements (2) linked one to the next in sequence, each comprising a pair of first mutually parallel tubular elements (4), fashioned in a biocompatible material, and a pair of filiform spacer elements (5), likewise biocompatible, which are inserted into the first tubular elements (4) in such a way that the assembled modular element (2) assumes a closed quadrangular configuration; each of the spacer elements (5) is deformable along its own longitudinal axis (X) so that the distance (D) separating the pair of first tubular elements (4) can be varied between a non-operative position of minimum clearance, in which the spacer elements (5) are collapsed and folded, and a stable operating position in which the first tubular elements (4) are spread fully apart with the spacer elements (5) at right angles to them.