Amplification and Assistive Devices (AAD)
Instructional Level: Intermediate
In a Contact Hearing Aid (CHA), non-acoustic energy is transmitted from a processor and earmold to a component, a “Lens,” that resides in long-term contact with the eardrum and directly drives the umbo. In this manner, mild-to-severe sensorineural impairment can be treated with amplification from 125-10,000 Hz while maintaining a widely vented fitting. A study of a CHA that uses inductive rather than optical coupling demonstrates less susceptibility to dynamic movement of the ear canal.