An archaic practice of drilling holes in a patient's skull to allow demons to escape is called:

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Trephination, also known as trepanation, involves drilling holes in the skull for various medical or religious reasons, including the belief that it would allow evil spirits to escape from the brain. It was practiced in many ancient cultures and has been found in archaeological evidence dating back to the Stone Age. Prefrontal lobotomy and cingulotomy are modern brain surgeries that have different medical purposes, and exorcism is a religious or spiritual ritual to expel demonic entities from a person or place.

An Archaic Practice of Drilling Holes in a Patient's Skull