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conduction unaided hearing threshold of ≥ 70 dB HL for 500, 1000, 2000 and 4000 Hz) in the ear to be implanted\n* Air conduction unaided hearing threshold ≤ 70 dB HL at 500 Hz in the ear to be implanted\n* Less than 15 years of severe to profound deafness on the implant ear prior to surgery\n* Post-lingually acquired hearing loss in the ear to be implanted\n* Normal cochlear anatomy as confirmed by pre-operative imaging in the ear to be implanted\n* Listed for an Advanced Bionics HiRes Ultra (3D) HiFocus SlimJ electrode array\n* Listed for cochlear implant surgery under general anaesthesia\n* Fluent in local language\n* Given informed consent to participate in the study\n\nExclusion Criteria:\n\n* Abnormal cochlear anatomy (including ossification) as identified by pre-operative radiological evaluation in the ear to be implanted\n* Any pre-existing cochlear or middle ear pathology, such as otosclerosis, cholesteatoma, or previous middle ear surgery in the ear to be implanted\n* Any medical conditions that would increase the risk of local complications during cochlear implantation, such as autoimmune diseases or active local infections\n* Diagnosis of auditory spectrum neuropathy disorder\n* Deafness due to lesions of the acoustic nerve or central auditory pathway\n* Deafened by meningitis\n* Single sided deafness (average for 500, 1000, 2000 and 4000 Hz in the better ear ≤ 30 dB HL)\n* Asymmetric hearing loss (average for 500, 1000, 2000 and 4000 Hz in the better ear \\> 30 dB HL and ≤ 55 dB HL)\n* History of previous cochlear implantation\u002Fre-implantation on either ear\n* Any contraindications to computed tomography (CT) scans\n* Concurrent participation in other cochlear implant related studies","ALL","18 Years",{"count":169,"type":170},102,"ESTIMATED","INTERVENTIONAL",[173],"NA","The goal of the study is to determine the benefit of using an ECochG-based corrective action guide during cochlear implant surgery compared to the traditional surgical approach without ECochG surveillance and guidance.",[176,177],"Hearing Loss, Sensorineural","Severe-to-profound Hearing Loss",[179,180,181,182,183,184,185,186],"Electrocochleography","Hearing Preservation","Structure Preservation","Intra-cochlear monitoring","Scalar translocations","Cochlear Microphonics","Corrective action guide","Cochlear Implants","2026-01-02",{"date":189,"type":190},"2026-01-06","ACTUAL",{"date":192,"type":190},"2024-05-15",{"date":194,"type":170},"2026-12-31",{"name":5,"class":6},7]