Implantable device (10) for the treatment of hydrocephalus syndrome in a patient, comprising movement means (1 1), implantable in the patient, designed to move the cerebrospinal fluid (CSF) in the patients skull in order to control the intracranial pressure (ICP) a pressure sensor (17) designed to detect the instant pressure (ICP, Pmis) of the cerebrospinal fluid (CSF) in the skull and electronic monitoring and control means (20, 21, 22) designed to govern the operation of device (10) wherein movement means (1 1) comprise an assembly consisting of a rotary volumetric micropump (12) a catheter (13) connected at one extremity to micropump (12) and a bag (14), made of yielding material, 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 (F) which remains constant over time, and wherein electronic monitoring and control means (20, 21, 22) are designed to process the values (Pmis), as detected by sensor (17), of the instant pressure (ICP) of cerebrospinal fluid (CSF) and to generate a corresponding control signal (V, S), which in turn drives micropump (12), and consequently controls the contraction and expansion of bag (14) so that the amplitude of the variable component of the intracranial pressure (ICP) due to the cardiac cycle is minimised.Linvention concerne un dispositif implantable (10) pour le traitement du syndrome dhydrocéphalie chez un patient. Ce dispositif comporte des moyens de déplacement (11), implantables dans le corps du patient, conçus pour déplacer le liquide céphalorachidien (CSF) dans le crâne dun patient afin de réguler la pression intracrânienne (ICP) un capteur de pression (17) conçu pour détecter la pression instantanée (ICP, Pmis) du liquide céphalorachidien (CSF) dans le crâne des moyens de surveillance et de commande électroniques (20, 21, 22) conçus pour diriger le fonctionnement du dispositif (10), les moyens de déplacement (11) comportan
