| 摘要 |
The intramedullar bolt with incorporated reversing mechanism adapted to the anatomical particulars of various bones is characterised by the presence of the incorporated reversing mechanism within the bolt which, when it is being positioned, emerges from the inside outwards, is stabilised against the spongy and shell parts of the bone and prevents rotational instability of the fracture by providing a parallel and small resistance to compression and bending forces. The incorporated reversing mechanism is divided for descriptive purposes into the following parts: a. blade (the part which emerges from the bolt), b. rotation mechanism (the way in which the rotation needed for emergence is achieved), c. stem (the part on which the blade is fixed), d. combination of the stem and the rotation mechanism, e. stabilising clip (the part which stabilises the implant in the bolt and bone). The incorporated reversing mechanism is fitted to a specially modified bolt and special tools are used for its positioning and removal. The advantages of this invention are that no rotational instability is allowed and a small resistance is offered to compressive forces, while in parallel it is easy to fit, no particular great experience is required, it reduces the duration of surgery compared with self- stabilising intramedullar bolts, it does not require the use of a special position on the surgical table and the use of an X-ray television system, and the procedure for its removal is relatively simple. |
