The present invention provides an endoscope having an opening of a channel tube retracted from a distal end face having an observation window of the insert therein toward a proximal end side. When a plurality of polyps are removed, a picked-up polyp is moved back from the distal end face of the insert...http://www.google.com.au/patents/US6071233?utm_source=gb-gplus-sharePatent US6071233 - Endoscope
