Abstract: A method for influencing cerebral perfusion in a patient by modifying a volume of a volume adaptor introduced into a cerebral ventricle of the patient, the method comprising identifying a timing of a cerebral blood inflow and/or outflow in a cardiac activity of the patient, modifying a volume of the volume adaptor in synchronization to the identified timing of the cerebral blood flow, to an amount sufficient to modify an intracranial pressure in the cerebral ventricle, such that a flow of the cerebral blood flow is enhanced. In some exemplary embodiments of the invention, the inflation duration of the volume adapter is short relative to the cardiac cycle.