Leucotome

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A leucotome or McKenzie leucotome is a surgical instrument used for performing leucotomies (also known as lobotomy) and other forms of psychosurgery.

Contents

The leucotome was invented by the Nobel Prize-winning Portuguese neurologist Egas Moniz. [1] His early design was an altered cannula, and later models would be reportedly based on an apple-corer. [2] Alongside Almeida Lima, Moniz would develop these designs into a leucotome with a retractable wire loop. [3]

A more refined leucotome would be 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 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. [4]

A leucotome designed by Neurosurgeon John Crumbie, Croydon Mental Hospital, 1955 Leucotome, designed by Neurosurgeon Dr John Crumbie 1955 (front view).jpg
A leucotome designed by Neurosurgeon John Crumbie, Croydon Mental Hospital, 1955

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 was later used. [6]

Lobotomies were commonly performed from the 1930s to the 1960s, with a few as late as the 1980s in France. [7]

See also

Notes

  1. "The Nobel Prize in Physiology or Medicine 1949". NobelPrize.org. Retrieved 2023-11-05.
  2. "Bulletin of the Historic Medical Equipment Society | The British Association of Urological Surgeons Limited". www.baus.org.uk. 2007. Retrieved 2025-09-14.
  3. Fusar-Poli, Paolo; Allen, Paul; McGuire, Philip. "Egas Moniz (1875–1955), the father of psychosurgery". The British Journal of Psychiatry. 193 (1): 50–50. doi:10.1192/bjp.193.1.50. ISSN   0007-1250.
  4. "Kenneth G. McKenzie". Congress of Neurological Surgeons. 1954-07-01. Retrieved 2023-11-05.
  5. "The Museum of Medicine and Health : Leucotome". Manchester Digital Collections. Retrieved 2023-11-05.
  6. "'My Lobotomy': Howard Dully's Journey". NPR. 2005 [2005-10-16]. Retrieved 2023-10-05.
  7. "La neurochirurgie fonctionnelle d'affections psychiatriques sévères" (PDF) (in French). Comité Consultatif National d'Ethique. 2002-04-25. Archived from the original (PDF) on 2011-07-20. (French national consultative committee on ethics, opinion #71: Functional neurosurgery of severe psychiatric conditions)