The adhered strip fills up the otherwise void spaces between the face of the patient and {TAIL ~ the peripheral edge} of the mask, thereby preventing leakage of pressurized oxygen toward {HEAD ~ the eyes} of a patient during oxygen delivery 
The adhered strip fills up the otherwise void spaces between the face of the patient and { TAIL ~ the peripheral edge } of the mask , thereby preventing leakage of pressurized oxygen toward { HEAD ~ the eyes } of a patient during oxygen delivery
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH