A leucotome or McKenzie leucotome is a

surgical instrument A surgical instrument is a medical device for performing specific actions or carrying out desired effects during a surgery or operation, such as modifying biological tissue, or to provide access for viewing it. Over time, many different kinds of ...

used for performing leucotomies (also known as

lobotomy A lobotomy () or leucotomy is a discredited form of Neurosurgery, neurosurgical treatment for mental disorder, psychiatric disorder or neurological disorder (e.g. epilepsy, Depression in childhood and adolescence, depression) that involves sev ...

) and other forms of

psychosurgery Psychosurgery, also called neurosurgery for mental disorder (NMD), is the neurosurgical treatment of mental disorders. Psychosurgery has always been a controversial medical field. The modern history of psychosurgery begins in the 1880s under ...

. Invented by

Canadian Canadians () are people identified with the country of Canada. This connection may be residential, legal, historical or cultural. For most Canadians, many (or all) of these connections exist and are collectively the source of their being ''C ...

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 of the leucotome is depressed to extend a wire loop or metal strip into the brain. The leucotome is then rotated, cutting a core of brain tissue. This type was used by the

Nobel Prize The Nobel Prizes ( ; ; ) are awards administered by the Nobel Foundation and granted in accordance with the principle of "for the greatest benefit to humankind". The prizes were first awarded in 1901, marking the fifth anniversary of Alfred N ...

-winning Portuguese neurologist Egas Moniz. Another, different, surgical instrument also called a leucotome was introduced by Walter Freeman for use in the transorbital lobotomy. Modeled after an ice-pick, it consisted simply of a pointed shaft. It was passed through the tear duct under the eyelid and against the top of the eyesocket. A mallet was used to drive the instrument through the thin layer of bone and into the brain along the plane of the bridge of the nose, to a depth of 5 cm. Due to incidents of breakage, a stronger but essentially identical instrument called an

orbitoclast An orbitoclast was a surgical instrument used for performing transorbital lobotomies. Because actual ice picks were used in initial experimentation and because of continued close resemblance to ice pick shafts, the procedure was dubbed "ice pi ...

was later used. Lobotomies were commonly performed from the 1930s to the 1960s, with a few as late as the 1980s in France. (French national consultative committee on ethics, opinion #71: Functional neurosurgery of severe psychiatric conditions)

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A leucotome
from the University of Manchester Medical School Museum

Neurosurgery History of neuroscience Surgical instruments Lobotomy {{med-hist-stub

See also

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External links