The invention relates to an artificial sphincter (1) comprising, a valve (3) installed on a channel (2) of the human body and comprising mechanical closure means of said channel comprising elements sensitive to a magnetic field, and a control means magnetic (4) external to the human body adapted to disable said closure means. Said valve comprises a first fixed magnet (6) attracting a second magnet (7) movable in translation transversely to the axis of the channel, said first and second magnets (6, 7) being arranged opposite each other and on either side of said channel, said second magnet being provided with a compression means (8) of the channel protruding transversely from said second magnet and being movable by sliding on the surface of said channel and parallel to the axis of said channel, between two extreme positions (91, 92) at which are provided retaining means (101, 102) of said compression means. 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.
