Abstract: The invention relates to a detection system of an endo-urethral device for an artificial urinary sphincter implantable in the body of a patient, said sphincter comprising an occlusive cuff (2) adapted to compress the urethra, the bladder neck or the prostate of said patient, an activation device (5) of said cuff (2) and a control unit (6) adapted to control the activation device. Said system comprises at least one compression sensor (13) of the urethra and a posture sensor (9), and a processing unit (30) configured to determine: (i) if the compression parameter of the urethra exceeds a predetermined threshold during a predetermined period, (ii) if the patient is in a recumbent position. If the conditions (i) and (ii) are fulfilled, the processing unit sends to the activation device (5) an immediate reduction order of the compression exerted by the cuff (2).