A cannula (from Latin "little reed"; plural cannulae) or canula is a tube that can be inserted into the body, often for the delivery or removal of fluid or for the gathering of data. In simple terms, a cannula can surround the inner or outer surfaces of a trocar needle thus extending needle approach to a vein by half or more of the length of the introducer.
Decannulation is the permanent removal of a cannula (extubation), especially of a tracheostomy cannula, once a physician determines it is no longer needed for breathing.
Read more about Cannula: Medicine, Veterinary Use, Aesthetic Medicine & Anti-ageing, Body Piercing, Non-medical Use