A urethral endosphincter (1) having a substantially tubular body, the endosphincter (1) being anchored in the urethra and provided with a valve, the endosphincter (1) being formed as a permanently elastic braid stent with the valve on its anterior region wherein the valve is sealed to the endosphincter (1), and wherein the valve has a closed position in which it blocks the passage of fluid, and an open position in which it allows fluid passage, the valve exceeding a first one fixed, applied to the valve fluid pressure (p) from the closed position to the open position and falls below a second set, applied to the valve fluid pressure (p) again passes from the open position to the closed position, characterized in that the valve substantially as a hemispherical or parabolic Ku ppe (8) is formed of an elastic material provided with a slit (9), the dome (8) invaginating at the first fixed fluid pressure (p), thereby deforming the slit (9), that liquid can pass through the valve and the dome (8) on reaching the second fixed fluid pressure (p) returns to the initial position, whereby the valve is closed.
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