Implantable system comprising a variable-volume reservoir

A system that is implantable in a human or animal body, comprising:

• a fluid circuit comprising:
• an inflatable element containing a variable volume of a fluid;
• a variable-volume fluid reservoir, said reservoir comprising a stationary first part and a second part movable relative to the first part;
• a fluidic connection between the reservoir and the inflatable element;
• and
• an actuator, mechanically coupled to the second part in order to selectively move the second part relative to the first part so as to vary a volume of the reservoir until a determined volume is attained;
• wherein the second part is also elastically deformable, such that, when the second part is stationary relative to the first part, the second part is adapted for being mechanically deformed at least in response to a variation in pressure in the fluid circuit, so as to adjust the volume of the reservoir relative to the determined volume in order to compensate, at least in part, said variation in pressure in the fluid circuit.