The controller detects transitions between inspiration and expiration via {TAIL ~ a flow signal} to discriminate between the respiratory phases of {HEAD ~ the patient} 
The controller detects transitions between inspiration and expiration via { TAIL ~ a flow signal } to discriminate between the respiratory phases of { HEAD ~ the patient }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD