Scheme of the 3100B high-frequency oscillatory ventilator (HFOV) and the demand-flow system (DFS) connection. (a) The basic principle of the 3100B high-frequency oscillator. (b) Schematic drawing of the connection of the DFS to the 3100B oscillator. Pprox, proximal airway pressure.
van Heerde et al. Critical Care 2006 10:R103 doi:10.1186/cc4968