A cap assembly of a front end of an inserting portion of an endoscope and a cap to be attached to the front end of the endoscope, comprising; a first engaging portion provided on the front end of the inserting portion of the endoscope; and, a second engaging portion provided on the cap being ...http://www.google.es/patents/US5746695?utm_source=gb-gplus-sharePatente US5746695 - Front end structure of endoscope
