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During laparoscopy, a cannule is inserted into the abdomen to ... Anesthesiology
93(6), 1407–1412. (2000). 22. Rasmussen I, Hillered L, Ungerstedt U, ...
a small tube made for insertion into a body cavity or into a duct on vessel and sometimes fitted with a trocar during the act of insertion

Reference Customs Tariff,Notex CCD,70.17;40.12
(1)
TERM cannula

Reference Reallex Med;Customs Tariff,Notex CCD,90.17;Customs Tariff,Notex CCD,70.17;40.12

Note {NTE} instrument for human medicine and surgery

A flexible tube, usually containing a trocar at one end, that is inserted into a bodily cavity, duct, or vessel to drain fluid or administer a substance such as a medication.



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Note added at 13 mins (2005-07-13 18:58:39 GMT)
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http://www.answers.com/canula&r=67

Also from Gould dictionary.

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Note added at 21 mins (2005-07-13 19:07:21 GMT)
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Like Rachel says, the plural can also be cannulae. Google gives more for cannulas, but I guess it is personal preference!