#$%^&*AU2009217485B220150820.pdf#####31 Abstract A surgical mechanism control system comprising: a beam emitter unit configured to emit only a single beam and adapted to be attached to a 5 surgeon； a first pair of discrete beam detectors each adapted to detect an incident beam emitted by the beam emitter unit and output a corresponding control signal when in incident beam is detected； and a control unit configured to receive one or more control signals output by the beam detectors and control a surgical mechanism in accordance with the one or more control 10 signals.
