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