The utility model relates to
ear nose throat mouth part prop open technical field, and disclose a mouth part prop open device, including the outer frame, the one side sliding of outer frame is inserted and is equipped with the moving column, wherein a group the outer surface of center column is located in the outer frame inside fixed cover and is equipped with the first gear, the one end of center column extends to the outer frame outside fixed with the square frame, the middle slide of square frame is inserted and is equipped with the connecting rod, the top end one side of square bar is fixed with the dilatation plug, the utility model discloses through the cooperation use between outer frame, pull bolt, moving column, limit slot, first gear, second gear, square bar, dilatation plug and first spring, make two groups of dilatation plug's dilatation range controllable, and the specific situation of convenient adjustment according to patient, through the cooperation use between outer frame, square bar, center column, square frame, second spring, clamping block and connecting rod, conveniently replace the dilatation plug of wear or damage, reduce the use cost.