The lead assembly 1, wherein {TAIL ~ the continuously deflectable preformed curvature} has a maximum change of 0.5 mm of radius of curvature per {HEAD ~ 1 mm} of arc length 
The lead assembly 1 , wherein { TAIL ~ the continuously deflectable preformed curvature } has a maximum change of 0.5 mm of radius of curvature per { HEAD ~ 1 mm } of arc length
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH