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