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