MAUDE Adverse Event Report: COCHLEAR LTD NUCLEUS CI522 COCHLEAR IMPLANT WITH SLIM STRAIGHT ELECTRODE; NUCLEUS 24 COCHLEAR IMPLANT SYSTEM

Model Number	CI522
Medical Device Problem Code	Therapeutic or Diagnostic Output Failure (3023)
Health Effect - Clinical Code	Appropriate Clinical Signs, Symptoms and Conditions Term/Code Not Available (4581)
Date of Event	04/07/2026
Type of Reportable Event	Serious Injury
Event or Problem Description
Per the clinic, the patient experienced a performance decrement with the device.Hardware exchange and reprogramming attempts were made; however, the issue could not be resolved.The device was explanted on (b)(6) 2026, and the patient was reimplanted with another cochlear device during the same surgery.

• Brand Name: NUCLEUS CI522 COCHLEAR IMPLANT WITH SLIM STRAIGHT ELECTRODE
• Common Device Name: NUCLEUS 24 COCHLEAR IMPLANT SYSTEM
• Manufacturer (Section D): COCHLEAR LTD; 1 university avenue; macquarie university, nsw 2109 ; AS 2109
• MDR Report Key: 25211524
• Report Number: 6000034-2026-01802
• Device Sequence Number: 10369449
• Product Code: MCM
• UDI-Device Identifier: 09321502032599
• UDI-Public: (01)09321502032599(11)170110(17)190109
• Combination Product (Y/N): N
• Initial Reporter State: CA
• Initial Reporter Country: US
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Implanted Year: 2017
• Device Explanted Year: 2026
• Serviced by Third Party (Y/N): N
• Reporter Type: Importer
• Initial Reporter Occupation: Other
• Type of Report: Initial
• Report Date (Section B): 05/19/2026
• Report Date (Section F): 05/19/2026

1 Device was Involved in the Event

1 Patient was Involved in the Event

• Is this an Adverse Event Report?: Yes
• Is this a Product Problem Report?: No
• Operator of Device: Lay User/Patient
• Device Expiration Date: 01/09/2019
• Device Model Number: CI522
• Was Device Available for Evaluation?: Device Returned to Manufacturer
• Date Returned to Manufacturer: 04/22/2026
• Was the Report Sent to FDA?: Yes
• Distributor Facility Aware Date: 04/28/2026
• Event Location: Hospital
• Date Report to Manufacturer: 04/28/2026
• Initial Date Received by Manufacturer: Not provided
• Initial Report FDA Received Date: 05/18/2026
• Is This a Single-Use Device that was Reprocessed and Reused on a Patient? (Y/N): No
• Patient Sequence Number: 1
• Outcome Attributed to Adverse Event: Required Intervention
• Patient Age: 11 YR
• Patient Sex: Female
• Date Report Sent to FDA: 05/19/2026