[Implantable devices for lengthening the femur without external drive mechanisms]

A distractor is proposed enabling the utilization of an internal supporting point to actuate a lengthening mechanism and to perform the distraction simultaneously with bone fragment fixation. With the device, a long-term skin perforation is avoided, and there is no need in external drives as well. The distractor is mounted inside the bone by means of a special auxiliary device to provide the aiming boring of the femoral bone.