A tracheal tube has a sealing cuff (10, 120, 400, 510) towards its patient end of a visco- elastic foam material covered by a layer (101, 101 , 402, 502) of an impervious material. The cuff (10) may extend along its length in contact with the outside of the shaft (1, 1, 1") or the cuff (120) may have a wall of visco-elastic foam material defining a space (204) between the outside of the shaft (1 ) and the inside of the cuff when this is inflated.
