A system for detecting an endo-urethral device for an artificial urinary sphincter implantable in the body of a patient, said sphincter comprising an occlusive cuff adapted to compress the urethra, respectively the bladder neck or the prostate of said patient, an activation device of said cuff for adjusting the compression exerted by the cuff and a control unit adapted to control the activation device, said detection system comprises: - at least one sensor called « compression sensor » adapted to measure a compression parameter of the urethra, respectively of the bladder neck or of the prostate, - at least one sensor called « posture sensor » adapted to measure a posture parameter of the patient, said detection system being characterized in that it comprises: - a processing unit configured to: - receive measurement data from said sensors (9, 13), - determine from the measurement data of the compression parameter of the urethra, respectively of the bladder neck: (i) if the compression parameter of the urethra, respectively of the bladder neck, exceeds a predetermined threshold, called « detection threshold », during a predetermined period, without an order of said control unit being sent to the activation device to reduce the compression exerted by the cuff, - determine from the measurement data of the posture parameter of the patient: (ii) if the patient is in a recumbent position, - if the conditions (i) and (ii) are fulfilled, to send to the activation device of the artificial urinary sphincter, an immediate reduction order of the compression exerted by the occlusive cuff on the urethra, respectively on the bladder neck or the prostate, - an element for reducing mechanical stresses undergone by the activation device designed so as, when mechanical stresses undergone by the activation device exceed a determined stress threshold, to absorb some of said stresses so as to reduce stresses undergone by the activation device while maintaining the compression exerted by the cuff above the detection threshold. - at least one sensor called « compression sensor » adapted to measure a compression parameter of the urethra, respectively of the bladder neck or of the prostate, - at least one sensor called « posture sensor » adapted to measure a posture parameter of the patient, - a processing unit configured to: - receive measurement data from said sensors (9, 13), - determine from the measurement data of the compression parameter of the urethra, respectively of the bladder neck: (i) if the compression parameter of the urethra, respectively of the bladder neck, exceeds a predetermined threshold, called « detection threshold », during a predetermined period, without an order of said control unit being sent to the activation device to reduce the compression exerted by the cuff, - determine from the measurement data of the posture parameter of the patient: (ii) if the patient is in a recumbent position, - if the conditions (i) and (ii) are fulfilled, to send to the activation device of the artificial urinary sphincter, an immediate reduction order of the compression exerted by the occlusive cuff on the urethra, respectively on the bladder neck or the prostate, - receive measurement data from said sensors (9, 13), - determine from the measurement data of the compression parameter of the urethra, respectively of the bladder neck: (i) if the compression parameter of the urethra, respectively of the bladder neck, exceeds a predetermined threshold, called « detection threshold », during a predetermined period, without an order of said control unit being sent to the activation device to reduce the compression exerted by the cuff, (i) if the compression parameter of the urethra, respectively of the bladder neck, exceeds a predetermined threshold, called « detection threshold », during a predetermined period, without an order of said control unit being sent to the activation device to reduce the compression exerted by the cuff, - determine from the measurement data of the posture parameter of the patient: (ii) if the patient is in a recumbent position, - if the conditions (i) and (ii) are fulfilled, to send to the activation device of the artificial urinary sphincter, an immediate reduction order of the compression exerted by the occlusive cuff on the urethra, respectively on the bladder neck or the prostate, - an element for reducing mechanical stresses undergone by the activation device designed so as, when mechanical stresses undergone by the activation device exceed a determined stress threshold, to absorb some of said stresses so as to reduce stresses undergone by the activation device while maintaining the compression exerted by the cuff above the detection threshold.