Among other advantages, this feature of the invention allows {HEAD ~ the user} to change {TAIL ~ the relative rotational orientation} between the surgical tool and the bend region 
to change
Among other advantages , this feature of the invention allows { HEAD ~ the user } to change { TAIL ~ the relative rotational orientation } between the surgical tool and the bend region
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH