Medical device comprising an artificial contractile structure comprising at least one contractile element (1) adapted to contract a hollow body organ, in such a way that said contractile element (1) is adapted to be in a resting position or in an activated position, the activated position being defined with said contractile element (1) constricting the hollow body organ and the resting position being defined with said contractile element (1) not constricting the hollow body organ, the medical device comprising a tensioning device (2) adapted to apply a force so as to tighten the contractile element (1 ) around said hollow body organ. According to the invention, the tensioning device (2) is arranged to cause the contractile element (1) to apply a substantially uniform occlusive pressure of at most 8N/cm2, preferably at most 5N/cm2, further preferably at most 2N/cm2, said pressure varying by at most 15%, preferably by at most 10%, preferably by at most 5% along the circumference of the contact area between the contractile element (1) and the hollow body organ when the contractile element (1) is in its activated position.L'invention concerne un dispositif médical comprenant une structure contractile artificielle, comprenant au moins un élément contractile (1) conçu pour contracter un organe de corps creux, de telle sorte que ledit élément contractile (1) est conçu pour être dans une position de repos ou une position activée, la position activée étant définie avec ledit élément contractile (1) contractant l'organe de corps creux, et la position de repos étant définie avec ledit élément contractile (1) ne contractant pas l'organe de corps creux, le dispositif médical comprenant un dispositif de tension (2) conçu pour appliquer une force de façon à serrer l'élément contractile (1) autour dudit organe de corps creux. Selon l'invention, le dispositif de tension (2) est conçu pour amener l'élément contractile (1) à appliquer une pression occlusive sensiblement uniforme de 8N
