| 摘要 |
<p>An endoscope includes a gas changeover valve (8) provided in an operating section (3) and constructed by a piston (29) and a cylinder (21), an upstream side gas supply path section (25a) connected to a gas inlet port of the gas changeover valve, for leading gas to the gas changeover valve, a downstream side gas supply path section (25b) connected to a gas outlet port of the gas changeover valve and extending through an insertion section (2), for leading gas from said gas changeover valve, and a flexible flange (39) provided on the piston and capable of engaging the cylinder (21), for releasing gas in the downstream side gas supply suction to atmosphere when the gas pressure in the section exceeds a predetermined value.</p> |
