Device for carrying out a distraction for a compression of vertebral bodies during a spinal surgery

A device for carrying out at least one of a distraction and compression of vertebral bodies during in particular minimally invasive spinal surgery, said device comprising:

• a first and a second extension part, which parts are sleeve-shaped, at least in portions, and each have a longitudinal direction, and each of which parts can be secured on a bone anchor in a detachable but rigid and rotationally fixed manner, the bone anchors in each case being either of adapted for insertion or being already inserted into one of the vertebral bodies to be treated, and comprising a spreading arrangement for the extension parts, wherein the spreading arrangement has a first receptacle for detachably securing the spreading arrangement on the first extension part, wherein the spreading arrangement has at least two arms which form a scissor mechanism, which arms can pivot in a plane orthogonal to the longitudinal direction of the first extension part, wherein one end of a first arm is pivotally arranged in a region of the first receptacle and another end is pivotally connected to a second arm, and wherein said second arm is pivotally connected, remote from the first arm, to a second receptacle which is adapted for detachable securing on the second extension part, and wherein the spreading arrangement has a threaded spindle and an inner threaded part which are arranged in such a way that the arms are pivoted with respect to one another when the threaded spindle is screwed in or out in relation to the inner threaded part, the pivoting being such that the receptacles, and thus the extension parts are moved towards each other or away from one another while maintaining a mutual orientation in the plane orthogonal to the longitudinal direction of the first extension part.