| 摘要 |
The intramedullary nail for the treatment of fractures to the middle third of the diaphysis of the long bones, consists of an outer cylinder, which at its lower end divides into two equal parts and of an internal rod, which has on its upper part a screw mechanism and at the lower end two levers which: (a) during the introduction of the nail into the channel push the two equal parts of the external cylinder outward so that these wedge into the bone mass, preventing any rotational movement and (b) after setting of the fracture, the two equal parts of the cylinder close inwards, thus facilitating withdrawal of the nail. |
