Medical implant (10； 20) for the widening and support of a body vessel from its inner part (>； = "Stent"), which can be implanted in the body vessel in a state of contraction, preferably minimally invasive, can be positioned there and being brought into an expansion state, the implant (10； 20) being tubularly shaped, of elongated segments (11.11 ', 11 "； 21.21', 21") being constructed that form an implant wall (10； 20) ), and the segments (11.11 ', 11 "； 21.21', 21") being plastically deformable, at least in sections, such that the implant (10； 20), in its expansion state, remains permanently widened in the radial direction perpendicular to the longitudinal axis of the segments (11,11 ', 11 "； 21,21', 21"), and having at least one of the segments (11； 21) an expansion element (12 , 12 '； 22； 32a, 32b, 32c) that configures a segment section within that segment (11； 21), in which the expansion element (12,12'； 22； 32a, 32b, 32c) transc Urre partially, in the contracted state, geometrically perpendicular to the longitudinal axis of the segment (11； 21), presenting the development of the expansion element (12,12 '； 22； 32a, 32b, 32c) several changes of direction with respect to that longitudinal axis, characterized in that the material, thickness and width of the segment of the element of dilatation (12,12 '； 22； 32a, 32b, 32c) are chosen in such a way that the expansion element (12,12'； 22； 32a, 32b, 32c) can be brought to a lasting state of expansion by stretching plastic through the introduction of force in the radial direction of the implant (10； 20) of tubular shape, state in which the section that forms the expansion element (12,12 '； 22； 32a, 32b, 32c) presents a greater geometric expansion in the direction perpendicular to the longitudinal axis, and a lower geometric expansion in the direction of the longitudinal axis, than in the contraction state, because the expansion element (12,12 '； 22； 32a, 32b, 32c ) presents, in the contraction state, a narrowing zone
