The percussive ventilation breathing head (10) is adapted to be supplied with a flow of pulsatile gas fed to an elongated breathing head body at a proximal end (16) thereof. The breathing head body defines an interior passageway (40, 42) therein. A reciprocating injector shuttle (44) is movably mounted in the breathing head passageway. The shuttle moves distally due to the pulsatile gas, assisted by a diaphragm (34) and a venturi-like jet nozzle which nozzle pulls nebulized aerosol from a depending plenum and a nebulizer (20) attached below the depending plenum. A depending body (23) defines the plenum. The generally cylindrical nebulizer is attached below the depending body. The shuttle is also biased in a proximal direction within the interior passageway and moves proximally due to the bias (45). The shuttle defines an internal flow passage from a proximal shuttle input port (29) to a distal shuttle output port at the distalmost mouth (18) of the percussive ventilation breathing head body.
