Apparatus for controlling normal pressure hydrocephalus

An apparatus (20) for regulating the flow of cerebrospinal fluid in a patient with hydrocephalus comprising: an implantable shunt (30) having a valve adjustable resistor (40) to regulate the flow of cerebrospinal fluid into and abroad a ventricular cavity (12) of the patient and including a sensor element (50) for measuring a physiological characteristic of the patient; and a controller device of the external system that can be activated selectively (60) to communicate with the system implantable shunt, configuring the controller device of the system for adjusting the resistance of the valve when the patient the device is applied, characterized in that the sensor element (50) is a volume sensor for detecting volumetric variations within the ventricular cavity (12).