Vacuum/pressure generation device for biopsy instrument, has piston that protrudes into vacuum cylinder that is held in groove and rotatably movable around longitudinal axis, where groove is arranged at housing

摘要

The device has a coaxially arranged needle threaded spindle with a coaxial drive wheel, longitudinal-shiftably attached to a proximal part of a biopsy needle (6). The biopsy needle is arranged fixedly in a housing. A piston is arranged at the proximal end of the threaded spindle. The piston protrudes into a vacuum cylinder that is held in a groove and rotatably movable around a longitudinal axis. The groove is arranged at the housing.