The flange is able to flex relative to the tubular body whereby the surgical instrument inserted in the tubular body can be manipulated over a wide range of {HEAD ~ motion} inside {TAIL ~ the thoracic cavity} 
The flange is able to flex relative to the tubular body whereby the surgical instrument inserted in the tubular body can be manipulated over a wide range of { HEAD ~ motion } inside { TAIL ~ the thoracic cavity }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL