Bipolar mapping suction device

A method for using a suction instrument for surgical purposes, the method comprising:

• holding a handpiece and using the handpiece to guide the suction instrument;
• using a first interface to establish at least one fluid connection with an external suction device or rinsing device;
• applying, using the external suction device and via the first interface, negative pressure to a cannula unit extending from the handpiece to aspirate fluids from a surgical site, the cannula unit including an electrically conductive outer cannula tube, an electrically conductive inner cannula tube concentrically arranged in the outer cannula tube, the inner cannula tube forming a lumen capable of conducting fluids, tissue, or gases;
• using a second interface to establish a bipolar electrical connection with an external stimulation device;
• and
• using the cannula unit extending from the handpiece in an axial direction and mechanically connected to the handpiece at a proximal end of the cannula unit to perform intraoperative neuromonitoring (IONM), wherein using the cannula unit comprises applying, using the electrical stimulation device and via at least one of the inner and outer cannula tubes, electrical stimulation to nervous tissue of a subject and monitoring a response of the subject and wherein:
• the electrically conductive inner cannula tube is electrically connected to a first pole of the bipolar electrical connection of the second interface, and fluidly connected to the first interface;
• the electrically conductive outer cannula tube electrically connected to a second pole of the bipolar electrical connection of the second interface;
• and
• the cannula unit includes insulation concentrically arranged between the outer cannula tube and the inner cannula tube and configured to fully electrically insulate the outer cannula tube and the inner cannula tube in relation to one another.