1) Surgical instrument 
A leucotome or McKenzie Leucotome is a surgical instrument used for performing leucotomies (also known as lobotomy) and other forms of psychosurgery. Invented by Canadian neurosurgeon Dr. Kenneth G. McKenzie in the 1940s, the leucotome has a narrow shaft which is inserted into the brain through a hole in the skull, and then a plunger on the back o...