A device for use as an implant for surgical displacement of vertebrae, and that is comprised of two parts co-working in a sliding way: a sliding part with an internal thread and a carrier part, and also a driving element with an external thread which is located between the parts, is described. The driving element includes a head and the sliding part of the device includes a threaded guideline cooperating with the driving element and a seat of a diameter corresponding with the head's diameter and length greater than the head's length, and the carrier part has a seat of a diameter and length corresponding with the head's diameter and length.
