Guided by ultrasound, the doctor places the tip of the instrument at the site of the lesion. Simply pulling back the handle creates a vacuum that allows the entire lesion to enter the tube. The instrument is pushed gently into the breast to ensure the whole lesion is inside the tube. The diathermic electrode is pushed forward with the slider on the handle. Rotating the handle severs the lesion from the surrounding area. The instrument is withdrawn with the intact lesion inside the tube. The intact lesion is sent to histopathology for analysis.