Which commonly used anesthetic circuit is made up of a tube within a tube?
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A Bain system is a tube within a tube.
New oxygen and anesthetic gas is inhaled down the inner tube, and exhaled gas exits through the outer tube. (Note there is a modified form of a circular system called a “universal F circuit” that is also a tube inside a tube).
Use a Bain anesthetic circuit and a high oxygen flow rate of ~300 mL/kg/min for a non-rebreathing system.
Use a Bain circuit at a moderate flow rate (i.e., ~20-300 mL/kg/min or less) as a partial rebreathing system where the animal rebreathes some of the exhaled gases.
