Methods Measuring the artifical airway ballonet pressure among 100 patients by normal sphygmomanometer and VBM respectively, and then compared the results by auto- control.

• 方法 采自身对照法测100例患者人工气道气囊压力：采用普通血压计与德国产VBM专用气囊测压表测量，比较测定的结果。