An endoscope insertion apparatus is provided that has an inner-side unit in which a plurality of inner-side fixing sections having an inner-side arm are uniformly arranged in a circumferential direction, an outer-side unit in which a plurality of outer-side fixing sections having an outer-side arm are...http://www.google.com.au/patents/US8142348?utm_source=gb-gplus-sharePatent US8142348 - Endoscope insertion apparatus
