Implantable device or the treatment of hydrocephalus in a patient, comprising movement means designed to move the cerebrospinal fluid in the patients skull to control the intracranial pressure an assembly consisting of a rotary volumetric micropump a catheter connected at one extremity to the micropump and a bag fitted at the other extremity of the catheter and designed to contract and expand, wherein said assembly is filled with a given volume of a service fluid which remains constant over time, and wherein electronic monitoring and control means are designed to process the values (Pmis), as detected by a sensor of the instant pressure of cerebrospinal fluid and to generate a corresponding control signal which in turn drives the micropump and consequently controls the contraction and expansion of the bag so that the amplitude of the variable component of the intracranial pressure due to the cardiac cycle is minimized.
