The invention relates to an occlusion system implantable in a human or animal body and comprising: - a fluid circuit comprising: • an inflatable occlusion cuff (3), • a reservoir (5) of variable volume filled with a fluid, said reservoir comprising a fixed part and a movable part, - an actuator coupled mechanically to the movable part of the reservoir in such a way as to displace said movable part linearly with respect to the fixed part in order to adjust the volume of the reservoir, the actuator and the reservoir of variable volume being arranged in a sealed housing (1) containing a gas, - a sensor (21, 22) connected mechanically to the actuator and/or to the movable part of the reservoir, measuring a tensile and/or compressive force in the direction of displacement of the movable part of the reservoir, - a device for measuring the fluid pressure (P1) in the fluid circuit, taking into account at least the force measurement of said sensor (21, 22), the effective pressure surface (Seff) of the movable part of the reservoir, and the force exerted on the movable part of the reservoir of variable volume and associated with the gas pressure in the housing.
