MEDIZINISCHES INSTRUMENT

The instrument has an actuator (34) for rotating an inner shaft (26) around a longitudinal axis relative to an outer shaft (28). The actuator is arranged at a proximal end region of a shaft (12). An engaging piece (36a) engages with the inner shaft. Another engaging piece (36b) engages with the inner shaft in alternate manner to transfer rotational movement of the actuator to the inner shaft. The pieces are traversed through openings in a proximal end region (102) of the outer shaft. The openings are spaced from each other in longitudinal direction and are limited in circumferential manner.