Abstract: This invention relates to medicine, in particular to surgical devices for curing the locomotor apparatus with the aid of osteosynthesis. In order to improve operational reliability during implantation, the structure of the inventive device for elongating long bones is embodied in such a way that the axes of the bearing part and the thread screwed part of a screw-holder are offset at a distance ranging from 0.5 to 0.8 mm. A boss (bulge) is embodied on the external body of the device on the side of the orifice in which said screw-holder is fixed. The specific structural embodiment of a finger makes it possible to reduce the traumatic effects of a surgical operation.