 Sir Robert Reynolds Macintosh (1897–1989) also achieved significant advances in techniques for tracheal intubation when he introduced his new curved laryngoscope blade in 1943.The Macintosh blade remains to this day the most widely used laryngoscope blade for orotracheal intubation.In 1949, Macintosh published a case report describing the novel use of a gum elastic urinary catheter as an endotracheal tube introducer to facilitate difficult tracheal intubation.