A medical screw driver for introducing mono-axial or poly-axial pedicle screws into a vertebral body comprising: a shank which includes in the area of its proximal end portion a coupling portion for a detachable handling member to apply a torque to the shank and at the distal end portion of which a screw driver portion, especially comprising a Torx or hexagon socket profile, is provided that is adapted to be inserted in a corresponding seat at the screw head of the pedicle screw and which can transmit a torque applied to the shank to the screw head; and a sleeve (10, 16) relatively rotatable about the shank the distal end portion of which includes a coupling portion, especially a male thread portion, for coupling with a coupling portion, especially a female thread portion, appropriately formed at a head of the pedicle screw, characterized in that the sleeve (10, 16) has a multi-part, especially two-part design and comprises a distally arranged first sleeve portion including a first engaging portion and a second sleeve portion arranged proximally thereto including a complementary second engaging portion, wherein the first engaging portion and the second engaging portion are configured such that both can be made to engage so that the second sleeve portion can transmit a torque to the first sleeve portion so as to couple the coupling portion provided on the first sleeve portion to the head, and that the second sleeve portion can be disengaged from the first sleeve portion in the axial direction, especially without tools, and can be drawn off the shank in the proximal direction without having to release the first sleeve portion from the head of the pedicle screw. a shank which includes in the area of its proximal end portion a coupling portion for a detachable handling member to apply a torque to the shank and at the distal end portion of which a screw driver portion, especially comprising a Torx or hexagon socket profile, is provided that is adapted to be inserted in a corresponding seat at the screw head of the pedicle screw and which can transmit a torque applied to the shank to the screw head; and a sleeve (10, 16) relatively rotatable about the shank the distal end portion of which includes a coupling portion, especially a male thread portion, for coupling with a coupling portion, especially a female thread portion, appropriately formed at a head of the pedicle screw, characterized in that the sleeve (10, 16) has a multi-part, especially two-part design and comprises a distally arranged first sleeve portion including a first engaging portion and a second sleeve portion arranged proximally thereto including a complementary second engaging portion, wherein the first engaging portion and the second engaging portion are configured such that both can be made to engage so that the second sleeve portion can transmit a torque to the first sleeve portion so as to couple the coupling portion provided on the first sleeve portion to the head, and that the second sleeve portion can be disengaged from the first sleeve portion in the axial direction, especially without tools, and can be drawn off the shank in the proximal direction without having to release the first sleeve portion from the head of the pedicle screw.