Bradley P W, Younes M
J Appl Physiol Respir Environ Exerc Physiol. 1980 Sep;49(3):528-32. doi: 10.1152/jappl.1980.49.3.528.
We measured the "effective" dead space of five commonly used respiratory valves: Hans Rudolph valve, two-way J valve, triple-J valve, and modified Otis-McKerrow valves without and with vane. The dead space was measured using a technique that mimicked the operation of valves during ordinary laboratory procedures. The valves were ventilated with tidal volumes ranging from 0.35-3.00 liters and at different frequencies. With all valves, there was a marked tendency for "effective" dead space to be tidal volume dependent. The measured dead space approached the water-displacement volume of the common chamber of the valve only at tidal volumes in excess of 2.0 liters. The relation between valve dead space and tidal volume was independent of frequency.
我们测量了五种常用呼吸阀的“有效”死腔：汉斯·鲁道夫阀、双向J阀、三J阀以及不带叶片和带叶片的改良奥蒂斯-麦凯罗阀。使用一种模拟阀门在常规实验室操作中运行情况的技术来测量死腔。对这些阀门进行通气，潮气量范围为0.35至3.00升，且频率不同。对于所有阀门，“有效”死腔均有明显的潮气量依赖性趋势。仅在潮气量超过2.0升时，测得的死腔才接近阀门公共腔的水置换体积。阀门死腔与潮气量之间的关系与频率无关。
