| 摘要 |
<p>An apparatus for controlling and dividing ventilation between lungs during their independent ventilation and connecting only one respirator with the lungs by means of a double-lumen bronchial tube. The apparatus comprises two parallel inspiratory paths and two parallel expiratory paths to separate gas flows between the respiratory and each of the lungs. Each path is connected to the double-lumen bronchial tube through inspiratory and expiratory branches respectively. One of the expiratory paths comprises a positive end-expiratory pressure valve to apply this pressure selectively, to one lung only. A threshold inspiratory valve is placed in one of the inspiratory paths having a common point with the expiratory path not containing the positive end-expiratory pressure valve. This threshold valve is connected in series with a pneumatic unidirectional valve and divides ventilation between the lungs and patterns optimal inspiratory flows. Pneumatic unidirectional valves are situated in both inspiratory and expiratory paths to prevent mixing of gases flowing through these paths.</p> |
