The invention also relates {HEAD ~ an improved technique} of performing surgery through a flexible surgical port extending into the thoracic cavity and to an improved obturator for installing a flexible trocar tube or {TAIL ~ cannula} which provides the surgical port 
The invention also relates { HEAD ~ an improved technique } of performing surgery through a flexible surgical port extending into the thoracic cavity and to an improved obturator for installing a flexible trocar tube or { TAIL ~ cannula } which provides the surgical port
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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 TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH