| 摘要 |
The invention concerns a device comprising a rigid tubular member (2) covered with a flexible film (3) with low coefficient of friction having one first end (11) extending outside the tubular member and a second end (6) extending inside the tubular member and connected to an elastic driving member (7) fixed to the second end (6) of the flexible film and to the tubular member at a point thereof for tensioning the elastic member. |
