n. 套管

[医] 套管, 插管

[ noun ]
a small flexible tube inserted into a body cavity for draining off fluid or introducing medication
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Cannula \Can"nu*la\, n. [L. cannula a small tube of dim. of
canna a reed, tube.] (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}.]