A Cannula is a flexible tube which when inserted into the body is used either to withdraw fluid or insert medication. Cannulae normally come with a trocar attached, which allows puncturing of the body to get into the intended space. There are however 11 different kinds of cannulae: Bias Grind, Vet Point, Lancet Point, Deflected point (Anti-Coring), Pencil Point, Closed End Consistent Wall, Welded 'Ball' End, Bullet Point, Razor Edge, Probe Point (Blunt End) and Trocar. Intravenous cannulae are the most common in hospital use. A variety of cannulae are used to establish cardiopulmonary bypass in cardiac surgery. Nasal cannula is a piece of plastic tubing which runs under the nose and is used to administer oxygen. A cannula is also used in an emergency procedure to relieve pressure and bloating in cattle due most commonly to their accidentally grazing wilted legume or legume-dominant pastures, particularly alfalfa, ladino and red and white clover