Hearing aid (11, 12) that can be worn in the ear or hearing aid with an otoplasty element that can be worn in the ear, which comprises at least one input transducer (2¿) for receiving an acoustic input signal or electromagnetic and its conversion into an electrical signal, a signal processing unit (3 ¿) for the processing and amplification of the electrical signal, an earpiece (18, 28) for the conversion of the electrical signal into an acoustic signal and at less a first aeration channel (15, 23) characterized by at least a second aeration channel (16, 24) for aeration of the volume (14) of the ear canal enclosed by the auditory prosthesis (11, 22) or the element of otoplasty, being associated to the aeration channels (15, 16, 23, 24) in each case means to favor a sense of flow through the aeration channel (15, 16, 23, 24), to favor the air outlet of the volume (14) of the duct a uditive enclosed with the first aeration channel (15, 23) and to favor the entry of air into the volume of the ear canal enclosed with the second aeration channel (16, 24).
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