In the FIGURE, the medical ventilator 10 provides {HEAD ~ ventilation} to a patient 12 via {TAIL ~ a conduit} 14 
via
In the FIGURE , the medical ventilator 10 provides { HEAD ~ ventilation } to a patient 12 via { TAIL ~ a conduit } 14
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH