BIPOLAR MAPPING SUCTION DEVICE

The present invention relates to a suction instrument, more particularly a bipolar mapping suction instrument, for surgical purposes and to a system for suctioning fluids and tissue and for monitoring nerve tissue. The suction instrument comprises a cannula unit, which comprises an electrically conductive outer cannula tube, an electrically conductive inner cannula tube, and insulation. The electrically conductive inner cannula tube is electrically connected to a first pole of the bipolar electrical connection of the second interface. The electrically conductive inner cannula tube is arranged concentrically in the outer cannula tube which optionally can be insulated from the exterior. The electrically conductive inner cannula tube is mechanically connected to the handpiece and/or the first interface. The electrically conductive outer cannula tube is electrically connected to a second pole of the bipolar electrical connection of the second interface. The insulation is concentrically arranged between the outer cannula tube and the inner cannula tube. The insulation is configured to fully electrically isolate the outer cannula tube and the inner cannula tube in relation to one another.