A system for reversible contraceptive sterilization is described. It is proposed to provide an implantable tube valve for implanting in a human vessel, in particular, the fallopian tube. The implantable tube valve includes: an implantable tube having an inner tube wall extending between two axial tube ends and includes a mount inside the tube; and a valve member mounted in the mount and pivotable between an open position and a closed position. The valve member includes a sealing edge that contacts the inner tube wall, when pivoted in the closed position, with the valve member closing off passage through the implantable tube. The valve member further includes an outer face conformal to the inner tube wall and an inner face conformal to the outer face, thereby providing unobstructed passage through the implantable tube when pivoted in the open position.