A cranial burr hole cover having an internal bracing member, a locking external cover member joined by one or more connecting members, and a locking mechanism that precludes movement of the external cover member relative to the connecting members in the proximal direction once the cover is secured onto the skull. The internal bracing member is longer than it is wide. For a given burr hole, the cover will be chosen such that the longitudinal dimension is greater than the diameter of the burr hole and the width dimension is less than the diameter of the burr hole. With this structure the interior bracing member of the burr hole cover may be inserted through the burr hole by tilting the internal bracing member such that a longitudinal end of the internal bracing member is able to be inserted into the hole and under the skull. The internal bracing member is then moved laterally relative to the burr hole to bring the connecting members close enough to the edge of the burr hole to allow the opposite end of the internal bracing member to clear the opposite edge of the burr hole. The internal bracing member is then centered beneath the burr hole with both longitudinal ends positioned beneath the skull. The external cover member is now moved distally toward the skull and the internal bracing member to cover the burr hole. The locking mechanism secures the cover in place on the skull and the connecting members extending from the cover member are cut flush with the cover member.
