| Existing comment:
To perform a trephination, the patient was first anesthetized. The tissue surrounding the trephination site was then pulled back and the trephine placed on the site. The trephine was turned in a circular motion to slowly cut through the bone. Care was taken not to cut the tissue surrounding the brain. An instrument called an elevator was used to raise sections of fractured bone away from the brain. A Heye's saw was used to remove protruding bone fragments. |