A minimal invasive neurosurgery assembly (20) including a flush assembly (50) having flush assembly main part (52) with a central passage (58) extending through the main part from the distal end to the proximal end along a longitudinal axis, and having at least one tool insertion assembly (70). The tool insertion assembly may include a tool handling part (72) that is detachably connectable to the flush assembly main part and that has at least one tool insertion channel (50) that extends from the distal end to the proximal end of the tool handling part. The tool insertion assembly may also include an inner sheath (96) that is connected to the tool handling part and has an inner sheath wall and at least one lumen extending parallel to the longitudinal axis and in which an associated one of the at least one tool insertion channel emanates. The inner sheath may be insertable through the central passage (58) of the flush assembly main part.
