Posterior burr hole localizer

A posterior burr hole Vocalizer device comprises a head band for attachment to a patient's head, a band constriction unit for adjusting the diameter of the head band, a sagittal plane aligning piece, and a trajectory plane aligning piece. The device is properly positioned on a patient's head in relation to the supraorbital rims and the superior attachment point of the patient's external ears in order to define an optimum location for a posterior burr hole site. Methods of making such a burr hole localizer device are also disclosed, together with methods for locating an anterior target site and an optimum posterior burr hole site.