Improving the efficiency of the drawover anaesthetic breathing system.
We investigated modifications to the reservoir tube usually used in drawover anaesthetic breathing systems as a method of improving its efficiency and performance. The resulting oxygen concentration was recorded at different oxygen flow rates whilst an artificial lung was being ventilated over a range of minute volumes. Addition of a reservoir bag and valves significantly increased the measured percentage of oxygen at the common gas outlet when compared to a 300-ml reservoir tube. There was no difference in the percentage of oxygen when comparing a reservoir bag and a 600-ml reservoir tube.
Eales
M
M
Department of Anaesthesia, Gloucestershire Royal Hospital, Great Western Road, Gloucester, Gloucestershire GL1 3NN, UK. mikeeales99@hotmail.com
Rowe
P
P
Tully
R
R
D000769:Anesthesia, Inhalation / Q000295:instrumentation*; D004334:Drug Administration Schedule; D004867:Equipment Design; D006801:Humans; D010100:Oxygen / Q000008:administration & dosage; D012121:Respiration, Artificial
D010100:Oxygen