can·nu·la /ˈkænjələ/
  套管
  can·nu·la /ˈkænjələ/ 名詞
  插管
  cannula
  插套
  Can·nu·la n.  Surg. A small tube of metal, wood, or India rubber, used for various purposes, esp. for injecting or withdrawing fluids. It is usually associated with a trocar. [Written also canula.]
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  cannula
       n : a small flexible tube inserted into a body cavity for
           draining off fluid or introducing medication