The device 4, wherein the path in the shell is created in response to {HEAD ~ the shape memory material} attaining {TAIL ~ a predetermined temperature} 
The device 4 , wherein the path in the shell is created in response to { HEAD ~ the shape memory material } attaining { TAIL ~ a predetermined temperature }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL