| 摘要 |
The tube-shaped device to be inserted into the bone and used for its extension is provided with an electrically driven (7, 8) planetary system (11) in its front area in order to act in combination with an outer housing (1) serving as the ring gear. The planet wheels protrude through openings (12) in the inner housing (2), which is provided with conical spaces accommodating the shafts driving the planet wheels. |
