A Study to Explore Improved Features and a Simplified Treatment Approach for a Totally Implantable Cochlear Implant (TICI) Research System in Adults with Severe Hearing Loss

Inclusion Criteria:

• Aged 18 years or older, at time of consent

• Candidate for cochlear implantation as assessed by the implanting clinic

• Fluent in English, as determined by the investigator

• Willing to participate in and comply with all requirements of the protocol

• Willing and able to provide written informed consent

Exclusion Criteria:

• Severe, or poorer, bilateral sensorineural hearing loss prior to five years of age,as reported by the subject

• Duration of severe to profound hearing loss greater than 20 years in the ear to beimplanted as reported by the subject or by audiometric history, if available

• Ossification, otosclerosis, malformation or any other cochlear anomaly, such ascommon cavity, that might prevent complete insertion of the electrode array

• Deafness due to lesions of the acoustic nerve affecting the ear to be implanted

• Medical or psychological conditions that would contraindicate undergoinganaesthesia, surgery or participation in the clinical investigation, as determinedby the investigator

• Additional disabilities that may affect the subject's participation or safety duringthe clinical investigation, as determined by the investigator

• Unrealistic expectations on the part of the subject regarding the possible benefits,risks and limitations that are inherent to the surgical procedure and prostheticdevice, as determined by the investigator

• Desire to use an integrated acoustic component post-implantation

• Unable or unwilling to comply with the requirements of the clinical investigation asdetermined by the Investigator

• Investigator site personnel directly affiliated with this study and/or theirimmediate families; immediate family is defined as a spouse, parent, child, orsibling

• Cochlear employees or employees of Contract Research Organizations or contractorsengaged by Cochlear for the purposes of this investigation.

• Current participation, or participation in another interventional clinicalstudy/trial in the past 30 days, involving an investigational drug or device (unlessCochlear sponsored and determined by investigator or Sponsor to not impact thisinvestigation)