| 摘要 |
<p>The device comprises an oblong casing (1) with a through channel (2). An inflatable collar (5) is mounted between the ends of the casing, whereas on one of the ends of the casing (1) is mounted an inflatable chamber (3) connected to the channel (2). The collar (5) is mounted to be movable along the casing (1) and a tube (9) for an instrument is rigidly and hermetically secured to it. An extender (12) of the tube (9) may be provided for diagnostic purposes.</p> |
