| 摘要 |
PROBLEM TO BE SOLVED: To provide an endoscope in which a washing function for an observation window and a draining function are improved without increasing a frequency of washing.SOLUTION: On a head section 14a connected to a distal end of an inserter of an endoscope, an air/water nozzle 20, an observation window 26 and a ring projection 36 are provided. On the ring projection 36, a first inclined surface 37 and a vertical surface 38 are formed. The first inclined surface 37 inclines such that the outer diameter thereof gradually increases from the top surface of the observation window 26 toward a flat surface 25c. The vertical surface 38 is positioned at the counter side from the air/water nozzle 20 across the observation window 26. Fluid injected from the air/water nozzle 20 hits the first inclined surface 37 and spreads to pass over the observation window 26. The vertical surface 38 stops backflow of a water drop on the flat surface 25c toward the observation window 26, so as to prevent that the water drop reaches on the top surface of the observation window 26. |
