Hearing loss is by no means one-size-fits-all—its types vary widely, and so do the interventions. In hearing aid fitting, there is one golden rule at the very core: sensorineural hearing loss calls for "air-conduction" hearing aids as the first choice, while conductive and mixed hearing losses are better suited to "bone-conduction" hearing aids.
Understanding this fork in the "sound path" is the first step toward effective hearing rehabilitation.
I. Air-Conduction Hearing Aids: Paving the Way Precisely for "Inner Ear Perception"
Air-conduction hearing aids are the most mainstream and universally applicable solution today, and the vast majority of people with hearing impairment use this type.
• The "Natural Path" of Sound: Microphone picks up sound → Chip amplifies and processes it → Receiver delivers acoustic energy → Ear canal → Eardrum → Ossicles in the middle ear → Cochlea in the inner ear.
• Target Population: Sensorineural hearing loss.
• Core Principle: This approach presupposes that the patient's outer and middle ear structures are largely intact, and that the problem lies primarily in damaged inner ear hair cells or auditory nerve perception (e.g., age-related hearing loss, noise-induced hearing loss, drug-induced hearing loss, etc.). By precisely compensating gain across different frequencies, air-conduction hearing aids seamlessly interface with the inner ear, effectively improving speech clarity.
II. Bone-Conduction Hearing Aids: Bridging the Way Past "Outer/Middle Ear Obstacles"
When the "traditional channel" for sound is blocked, but the inner ear "receiving terminal" still functions well, bone-conduction hearing aids play an irreplaceable role in "breaking through" the impasse.
• The "Alternative Path" of Sound: They transmit acoustic energy directly to the inner ear via skull vibration, completely bypassing the diseased outer and middle ear.
• Target Population: Conductive hearing loss, mixed hearing loss.
• Typical Scenarios:
• Congenital malformations: Atresia of the external auditory canal, microtia, etc.
• Middle ear diseases: Chronic otitis media (with frequent drainage, making ear canal fitting unsuitable), otosclerosis, etc.
• Wearing Styles: Available in various forms, including non-surgical soft-band types, headband types, and surgically fixed bone-anchored types (e.g., BAHA), reopening the door to hearing for those unable to wear traditional ear tips
