In an endoscope apparatus, an optical end adapter is detachably attached to the end portion of an elongated inserting section, and an endoscope insertion aid is detachably provided which has the minimum diameter which is smaller than the maximum outer diameter of the optical end adapter. The endoscope...http://www.google.fr/patents/US4860732?utm_source=gb-gplus-shareBrevet US4860732 - Endoscope apparatus provided with endoscope insertion aid
Endoscope apparatus provided with endoscope insertion aid
