The closed circuit gas anesthesia system includes an
absorption chamber for removing carbon dioxide from air
exhaled into a mask. This air can then be recycled
back to a breathing bag for rebreathing, thus saving on
the quantity of gas anesthetic agents, and medical air
or oxygen needed.
Excess pressure in the breathing bag is released
through a pressure valve, which must be connected to an
exhaust from the room.
Animals weighing over 7 kg have sufficient tidal
volume to successfully operate the check valves in a
closed circuit system. Masks and Endotracheal tubes are
available for closed circuit systems. Any system capable
of closed circuit operation can also be used in an open
circuit configuration. Oxygen low-flow flowmeter or
nitrous oxide flowmeter add-on available.