A front end structure of a side-view type endoscope includes a metal front end body on the side face of which a view window is provided, and an end cap of a resilient material in the form of a cylinder with a closed bottom. The end cap is detachably attached to the front end body and is provided with...http://www.google.co.uk/patents/US5865726?utm_source=gb-gplus-sharePatent US5865726 - Front end structure of side-view type endoscope
