An instrument set comprises an outer tube and an inner tube projecting distally over the outer tube, between which at least two channels for retaining forceps extend, an observation optical system which can be introduced through the inner shaft, dilators to widen the opening in the organs, wounds or...http://www.google.com/patents/US5099827?utm_source=gb-gplus-sharePatent US5099827 - Instrument set for closing opened body organs, wounds or the like
