Medical and surgical apparatus and instruments; respiratory apparatus including apparatus and equipment for ventilation and oxygen concentration; respiratory apparatus and instruments including respiratory gas concentration apparatus for medical use; medical devices for monitoring, measuring and displaying respiratory breathing patterns, and predicting and preventing respiratory dysfunction during breathing assistance; respiratory aids and inhaler devices including breathing apparatus for artificial breathing; facial masks, oral masks, nasal masks, mouthpieces, all being for medical and surgical purposes; medical respiratory masks for the delivery of respiratory therapy; headgear for medical respiratory masks; endotracheal and endobronchial breathing hoses and breathing tubes and extension pieces for such breathing hoses and breathing tubes; breathing hoses and breathing tubes for connection with respiratory masks for medical purposes; laryngoscopes; laryngoscope blades; disposable replacement blades for laryngoscopes parts