Abstract: A device is provided for fixation of equipment to the head of a patient during neurological diagnosis, therapy or surgery, comprising a ring-shaped frame having at least three fixation pins which are attachable against the skull of the patient with a contact force for fixation of the device thereto. At least one connecting means is positioned at a location where the frame has a minimum of displacement due to deformation of the frame when the fixation pins are tightened towards the skull, in order to allow fixation of equipment for diagnosis, therapy or surgery to the frame without they being distorted as a consequence of the deformation of the frame. The invention also relates to a method for fixation of the head of a patient by means of such a device.