A rubber bag which is used to blow air into the middle ear to unblock: a Eustachian tube [Described 1863. After Adam Politzer (1835-1920), Professor of Otology in Vienna, Austria.]
A soft rubber bag with a rubber tip for inflating the middle ear by increasing the pressure in the nasopharynx.
A device designed to create a quick rise in air pressure within the nose to open the Eustachian tube, which connects to the middle ear. Blockage of this tube, possibly from conditions like catarrh, can result in atmospheric pressure pushing on the eardrum, inhibiting its vibration and leading to temporary hearing loss.