P_( max), FEF_(max), Vexpiration and PO_2 were measured, and coil expectoration and lung collapse investigated.

• 分别测量兔气肿前、气肿后、术后一周及四周四个时间点的静态气道压(P max)、最大呼气流量(FEFmax)、呼气末肺容积(V 呼气末)及血氧分压(PO2),并观察螺圈咳出/移位和肺萎陷情况。