cannula :

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  • n  a small flexible tube inserted into a body cavity for draining off fluid or introducing medication

  • But to make sure that his cannula is on target, he conducts a simple test.
  • Before the skull emerges, he 'collapses' it by inserting a three-millimeter instrument known as a cannula and extracting its fluid.
  • The bur holes permit passage of a leucotome, or lobotomy cannula, a hollow needle through which a loop of wire can be slipped.

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