Abstract: In the case of a tool (140) for handling a sample, which comprises a fastening device (141) for detachably fastening the tool to a tool holder of a sample handling apparatus, and comprises a sample manipulation device, for example realized as a syringe (150), fastened to the fastening device (141), this tool comprises a holding device, for example in the form of a needle guide (160), which, on the one hand, is fastened to the fastening device (141) so as to be movable in a coupling direction (165) and, on the other hand, can be coupled to and decoupled from the tool holder in the coupling direction (165).

Abstract: In the case of a tool (140) for handling a sample, which comprises a fastening device (141) for detachably fastening the tool to a tool holder of a sample handling apparatus, and comprises a sample manipulation device, for example realized as a syringe (150), fastened to the fastening device (141), this tool comprises a holding device, for example in the form of a needle guide (160), which, on the one hand, is fastened to the fastening device (141) so as to be movable in a coupling direction (165) and, on the other hand, can be coupled to and decoupled from the tool holder in the coupling direction (165).

Abstract: The invention relates to a toothed wheel (4) for mounting in a toothed gearing (1), wherein the toothed wheel (4) and a cylindrical gear (8) form a gear pair. The toothed wheel (4) has a curved pitch surface (5) with teeth, which comprises at least one tooth (7) extending spirally. The toothed wheel (4) is configured for mounting in the gear pair in such a way that the axis (2) of the toothed wheel (4) extends substantially perpendicular relative to the axis of the cylindrical gear (8).