1. An extension device made with the possibility of placement inside or across the bone having the first and second separate sections, comprising: a housing made with the possibility of attachment to one of the first and second separate sections of the bone； a distraction shaft having an internal cavity along its length and made with the possibility of attachment to another of the first and second separate bone sections； a permanent magnet made to rotate relative to the body and having at least two poles, while the permanent magnet is associated with the lead screw, the lead screw being mated to a threaded portion of the internal cavity of the distraction shaft； as well as a thrust bearing located in the housing between the lead screw and the permanent magnet, while the thrust bearing is located in the middle between the first and second stops in the housing. 2. The extension device according to claim 1, in which the rotation of the permanent magnet in the first direction through multiple rotations causes the threaded spindle to undergo compression and causes the thrust bearing to tend to move or to actually move in the first axial direction and in contact with the first focus, and in which the rotation of the permanent magnet in the second direction through many turns leads to the lead screw under tension, and leads to the thrust bearing It is the tendency to move or indeed moved in a second axial direction opposite the first axial direction, and in contact with the second uporom.3. An extension device according to claim 1, further comprising1. Удлиняющее устройство, выполненное с возможностью размещения внутри или поперек кости, имеющей первую и вторую отдельные секции, содержащее:корпус, выполненный с возможностью крепления к одной из первой и второй отдельных секций кости；дистракционный вал, имеющий внутреннюю полость вдоль своей длины и выполненный с возможностью крепления к другой из первой и второй отдельных секций кости；постоянный магнит, выполненный с возмо
