The motor controller sends out a signal to control {HEAD ~ an electric motor} and turbine to generate {TAIL ~ the desired inspiratory and expiratory pressures} 
The motor controller sends out a signal to control { HEAD ~ an electric motor } and turbine to generate { TAIL ~ the desired inspiratory and expiratory pressures }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL