Note:  Do not rely on this information. It is very old.


Cannula, a tube used for evacuating fluids in certain surgical operations. It is commonly associated with a trochar, that is, a perforating instrument, closely fitting the cannula and admitting of withdrawal from it when the puncture has been made. By means of a trochar and a cannula ascitic fluid is drawn off from the peritoneal cavity, hydrocele sacs are tapped and the fluid contents of cysts are evacuated; sometimes the cannula is connected with an aspirating apparatus, as in the removal of fluid from the pleural cavity. The tracheotomy cannula is a tube of suitable shape inserted into the trachea to procure ready access of air to the lungs in cases of laryngeal obstruction.

“Since the fall, God will not trust us with our own salvation, but it is both purchased and kept by Christ for us, and we for it through faith, wrought by the power of God.”
–Richard Sibbes, The Bruised Reed and Smoking Flax