the present invention relates to an implantable cuff and / or optrode electrode (40) adapted to surround a substantially cylindrical tissue (70), and comprising: a support sheet (43) wound around a longitudinal geometric axis, z, forming a cuff of the inner diameter, de, and extending over a length, l, along the longitudinal geometric axis, z, where the cuff comprises, an inner surface (43d) that forms an interior of the cuff, and a external surface (43u) that forms an exterior of the cuff, a central portion, which extends over a length, lc, of at least 50% of the length, l, of the cuff, and has an average central thickness, tc, and in which the central portion is flanked on either side by a first edge portion (43e) of medium edge thickness, te1, which extends from a first free edge of the cuff and a second edge portion (43e) of thickness medium edge, te2, and extending from a second free edge, at least a first electrode contact or a first optrode exposed on the inner surface of the cuff, and remote to the outer surface that forms the exterior of the cuff, characterized by the fact that the average edge thicknesses, te1, te2, of the first and second portions edge are each smaller than the average central thickness, tc, (te1 <；tc and te2 <；tc), and where, the inner surface of the cuff extends beyond the central outer surface in both directions along the axis longitudinal geometric, z.a presente invenção se refere a um eletrodo cuff e/ou optrodo implantável (40) adaptado para circundar um tecido substancialmente cilíndrico (70), e que compreende: uma folha de suporte (43) enrolada ao redor de um eixo geométrico longitudinal, z, que forma um cuff do diâmetro interno, de, e que se estende sobre um comprimento, l, ao longo do eixo geométrico longitudinal, z, em que o cuff compreende, uma superfície interna (43d) que forma uma interior do cuff, e uma superfície externa (43u) que forma um exterior do cuff, uma porção central, que se estende sobre um comprimento, lc, de
