[Mechanical guide of the rotor trepan in keratoplasty (author's transl)].

A new system of trepanation based on a firm mechanical guide of the rotor trepan is described. Apart from the well-known advantages of the electrically driven trepan, further considerable improvements are evident. As here the rotor instrument is guided mechanically, the risky and important phase of corneal incision in keratoplasty is considerably less dangerous. With this instrument, the incision becomes much safer, the centring of the trepan becomes easier and an unintentional injury of iris and lens may be considerably avoided.