Figure 2From: Intrapulmonary percussive ventilation in acute exacerbations of COPD patients with mild respiratory acidosis: a randomized controlled trial [ISRCTN17802078]Schematic of the phasitron. The sliding venturi body moves back and forth to open and close the phasitron exhalation gate by an orificed diaphragm. Burst of air and aerosol are delivered to the patient during forward movement of the phasitron.Back to article page