The invention relates to an artifical sphincter (1) comprising a valve (3) installed in a channel (2) of the human body and comprising means for mechanically closing said channel, said means being provided with elements that are sensitive to a magnetic field, and a magnetic control means (4) outside the human body, which can deactivate said closing means. Said valve comprises a first stationary magnet (6) attracting a second magnet (7) which is translatably mobile transversely in relation to the axis of the channel, said first and second magnets (6, 7) being arranged facing each other and either side of said channel, said second magnet being provided with a means (8) for compressing said channel, which projects transversely from said second magnet, and being mobile by sliding on the surface of said channel and parallel to the axis of said channel, between two end positions (91, 92) where means (101, 102) for holding said compression means are arranged.L'invention concerne un sphincter artificiel (1) comportant, une vanne (3) installée sur un canal (2) du corps humain et comprenant des moyens de fermeture mécanique dudit canal comportant des éléments sensibles à un champ magnétique, et un moyen de commande magnétique (4) extérieur au corps humain apte à désactiver lesdits moyens de fermeture. Ladite vanne comporte un premier aimant fixe (6) attirant un second aimant (7), mobile en translation transversalement par rapport à l'axe du canal, lesdits premier et second aimants (6, 7) étant disposés en vis-à-vis et de part et d'autre dudit canal, ledit second aimant étant muni d'un moyen de compression (8) du canal faisant saillie transversalement dudit second aimant et étant mobile par glissement à la surface dudit canal et parallèlement à l'axe dudit canal, entre deux positions extrêmes (91, 92) au niveau desquelles sont ménagés des moyens de retenue (101, 102) dudit moyen de compression.
