In menstrual extraction, no anesthesia, local or general, is used, so the woman stays awake. As the cannula goes in, she feels it. She’s not just an inert body that’s having something done to her. She can feel the cannula as it touches the inner walls of her uterus. When she feels it touching the back wall, she will usually say, “It’s in.” Also, most cannulas have a mark at the 3 or 4 inch level to show the person inserting the cannula how far in the cannula is.