Tool fitting attachment for a surgical drill with additional manual drive unit, and surgical drill

A tool fitting attachment for a surgical machine, comprising:

• a drive-side coupling for mounting to a drive unit which provides a torque by a motor;
• and
• an output-side coupling for receiving a tool,
• wherein, between the two couplings, a manually operated drive unit is integrated,
• wherein the drive-side coupling is configured for coupling the tool fitting attachment to the drive unit via a torque, and
• wherein the output-side coupling is configured for receiving or connecting the medical tool by transmitting a torque,
• the tool fitting attachment further comprising a manually operable ratchet unit having an effective direction of rotation that can be manually changed, the ratchet unit being arranged between the drive-side coupling and the output-side coupling and having a torque introducing member/ratchet input component manually torque-operated via a handle and configured as a casing and a guide shaft/ratchet output component which is in torque engagement with the output-side coupling so as to transmit, in response to the effective direction of rotation, a manually introduced torque to the output-side coupling, the guide shaft/ratchet output component being operable as a disconnect coupling and axially movable relative to the output-side coupling by the handle in such manner that, at a first movement position, the handle connects the drive-side coupling to the output-side coupling via the torque while bypassing the ratchet unit and puts the ratchet unit out of operation and, at a second movement position, disconnects a torque connection between the drive-side coupling and the output-side coupling and puts the ratchet unit into operation.