Perforator for drilling bone tissue, comprising a drive shaft (12) with rotation axis (t), a drill head (14) with the same rotation axis (t), a chipping head (16) arranged coaxially around the later. A first connecting profile (20) is provided on a proximal end (18) of the drill head (14), and a second connecting profile (24) is provided on a distal end (22) of the drive shaft (12) for cooperating with the first connecting profile (20) in order to transfer rotational movement of the drive shaft (12) to the drill head (14), and the drill head (14) and the chipping head (16) being connected to each other displaceably along the rotation axis (t).
