The invention proposes a device for minimally invasive intervention in the skeletal region, in particular on the spinal column, having at least a cannula with a distal end generally bevelled in shape relative to a symmetrical axis of the cutting tool and an optical probe (endoscope) for insertion through the cavity of the cannula. The device is further characterized in that the cannula takes the form of a hollow cutting tool, in which the most distal region of the distal end comprises a cutting edge, which is incorporated into the edge of the wall of the cutting tool.