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	Pain (1994)
Date of Event	08/28/2026
Type of Reportable Event	Serious Injury
Event or Problem Description
Per the clinic, the patient experienced performance decrement with the device and pain with attempted mri scan.It was also reported that the patient was getting a second side implanted and wanted both implants to match.Subsequently, the device was explanted on (b)(6) 2026 and the patient was re-implanted 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: 50943250
• Report Number: 6000034-2026-03483
• Device Sequence Number: 9534163
• Product Code: MCM
• UDI-Device Identifier: 09321502032599
• Combination Product (Y/N): N
• Initial Reporter State: TX
• Initial Reporter Country: US
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Implanted Year: 2018
• Device Explanted Year: 2026
• Serviced by Third Party (Y/N): N
• Reporter Type: Importer
• Type of Report: Initial
• Report Date (Section B): 09/30/2026
• Report Date (Section F): 09/30/2026

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: 09/19/2019
• Device Model Number: CI522
• Device Catalogue Number: Z382660
• Was Device Available for Evaluation?: Yes
• Date Returned to Manufacturer: 09/16/2026
• Is the Reporter a Health Professional?: No
• Was the Report Sent to FDA?: Yes
• Distributor Facility Aware Date: 09/09/2026
• Event Location: Hospital
• Date Report to Manufacturer: 09/09/2026
• Initial Date Received by Manufacturer: Not provided
• Initial Report FDA Received Date: 09/30/2026
• 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 Sex: Male
• Date Report Sent to FDA: 09/30/2026