Cannula | 合法醫療器材資訊網

Tube surgically implanted in the body

A cannula (; Latin meaning little reed; PL: cannulae or cannulas)[1] is a tube that can be inserted into the body, often for the delivery or removal of fluid or for the gathering of samples. In simple terms, a cannula can surround the inner or outer surfaces of a trocar needle thus extending the effective needle length by at least half the length of the original needle. Its size mainly ranges from 14 to 26[2] gauge. Different-sized cannula have different colours as coded.

Decannulation is the permanent removal of a cannula (extubation),[3] especially of a tracheostomy[4] cannula, once a physician determines it is no longer needed for breathing.

Cannulas normally come with a trocar inside. The trocar is a needle, which punctures the body in order to get into the intended space. Man...