Abstract: The invention relates to a device for changing the function of a virtual instrument which is designed for use in a simulation system for surgical interventions. The inventive device is characterized in that it exchanges various virtual instruments that are associated with the same real handhold of the simulation system. A defined actuation of the handhold or an acoustic signal to be given by the user are designated to enable an input possibility in the control circuit via which one out of a plurality of virtual instruments can be chosen when the handhold is correspondingly actuated or the corresponding acoustic signal is given. After selection of the virtual instrument the display of the previous virtual instrument is replaced by the display of the selected virtual instrument. The inventive device enables the surgeon to carry out a simulated operation with various instruments without having to put down the handhold.

Abstract: A hand-held tool including an electromagnetic hammer mechanism (1) for applying a percussion movement to a working tool (3) and including at least one stator, at least one coil (4a), a striking piston formed as a yoke (10) supported in a magnetic flux for a limited displacement along the oscillation axis (A) and having at least one magnetomotive region (11) formed of a soft magnetic ferroelectric material, and at least one magnet (5a) associated with the stator, magnetizable along the oscillation axis (A), and arranged along and adjacent to at least one segment of the coil (4a) located at an end of the stator.

Abstract: A hand-held tool including an electromagnetic hammer mechanism (1) for applying a percussion movement to a working tool (3) and including at least one stator, at least one coil (4a), a striking piston formed as a yoke (10) supported in a magnetic flux for a limited displacement along the oscillation axis (A) and having at least one magnetomotive region (11) formed of a soft magnetic ferroelectric material, and at least one magnet (5a) associated with the stator, magnetizable along the oscillation axis (A), and arranged along and adjacent to at least one segment of the coil (4a) located at an end of the stator.