Word: cannula
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Dates: during 1930-1939
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...crosses a line running across the head from ear to ear. At each junction of the ear-to-ear line and the slits in the scalp, Drs. Freeman & Watts drill a hole with a dentist's bur. The bur holes permit passage of a leucotome, or lobotomy cannula, a hollow needle through which a loop of wire can be slipped...
...forming a loop near the distal end of the instrument. The leucotome is rotated through one complete circle, cutting a sphere or core of white matter in the pre-frontal area about ten millimetres in diameter. The stylet is withdrawn a few millimetres thus replacing the loop within the cannula. A second core is cut at a depth of three centimetres and a third at two centimetres. The leucotome is then entirely removed from the brain and re-introduced in an anterolateral [front and side] direction into the same prefrontal lobe where cores are cut at a depth...