Evaluation of Hearing Preservation in Adults With Partial Low-Frequency Hearing Implanted With the HiFocus™ Mid-Scala Electrode

Inclusion Criteria: * No previous cochlear implant experience * 18 years of age or older * Up to a moderate sensorineural hearing loss in the low-to-mid frequencies (pure tone average ≤ 65 dB HL for 125, 250, 500, and 1000 Hz) and a severe-to-profound sensorineural hearing loss in the high frequencies (pure tone average ≥ 70 dB HL for 2,000, 4,000, and 8,000 Hz) in the ear to be implanted * Aided monosyllabic word score of 10-50% in the ear to be implanted * Up to a moderate sensorineural hearing loss in the low-to-mid frequencies (pure tone average ≤ 65 dB HL for 125, 250, 500, and 1000 Hz) and a severe-to-profound sensorineural hearing loss in the high frequencies (pure tone average ≥ 70 dB HL for 2,000, 4,000, and 8,000 Hz) in the contralateral (non-implanted) ear * English language proficiency * Willingness to participate in all scheduled procedures outlined in the protocol Exclusion Criteria: * Previous inner ear surgery * Cochlear malformation or obstruction that would preclude full insertion of electrode array * Presence of additional disabilities that would prevent or interfere with participation in the required study procedures * Medical or psychological conditions that contraindicate surgery or impact the ability to manage an implanted device or the study-related procedures * Evidence of central auditory lesion or compromised auditory nerve