RESUMEN
Objective To introduce minimal-flow closed anesthesia device designed by doctors in Changhai hospital,which could be used more in clinical anesthesia.Methods According to requirement of minimal flow-closed anesthesia,the author improved and modified the construction of the ordinary system,such as O2 inlet changed and a descending bellow adopted etc.Results The designed minimal-flow closed anesthesia device can be used safely after preliminary clinical practice in anesthesia.Conclusion The designed minimal-flow closed anesthesia device possesses new principle,simple construction,least airborne environmental pollution and is easy to cope with the patient's up-take and metabolic needs of O2 as well as anesthetics.It can be safely used and might be useful to push ahead the minimal-flow closed anesthesia as a better mode of general anesthesia in future.