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