Disclosed is an artificial urinary sphincter and a kit of parts for providing urinary continence. The artificial urinary sphincter includes a casing, a coaptation valve including an iris diaphragm and a movable element. The iris diaphragm has an adjustable diameter and is movable to coapt a patients urethra by moving the movable element. The movable element is associated with the casing and sized to be palpated through the perineal skin in order to adjust the diameter of the iris diaphragm. Also disclosed is a method of providing urinary voiding control in a patient.
