MAUDE Adverse Event Report: COCHLEAR LTD NUCLEUS CI422 COCHLEAR IMPLANT WITH STRAIGHT ELECTRODE; NUCLEUS 24 COCHLEAR IMPLANT SYSTEM

Model Number	CI422
Medical Device Problem Code	Expulsion (2933)
Health Effect - Clinical Code	Tissue Breakdown (2681)
Type of Reportable Event	Serious Injury
Event or Problem Description
Per the clinic, the patient experienced an extrusion of the implant.Subsequently, the patient underwent a local wound care for a duration of 8 weeks and was treated with one course of oral antibiotic (specific date and duration not reported).However, the issue could not be resolved, and the device was explanted on (b)(6) 2026.It is unknown if there are plans to reimplant the patient with a new device as of the date of this report.

• Brand Name: NUCLEUS CI422 COCHLEAR IMPLANT WITH 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: 25648529
• Report Number: 6000034-2026-02455
• Device Sequence Number: 5877277
• Product Code: MCM
• UDI-Device Identifier: 09321502020268
• UDI-Public: (01)09321502020268(11)141127(17)161126
• Combination Product (Y/N): N
• Initial Reporter State: NC
• Initial Reporter Country: US
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Implanted Year: 2016
• 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): 06/29/2026
• Report Date (Section F): 06/29/2026

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: 11/26/2016
• Device Model Number: CI422
• Was Device Available for Evaluation?: No
• Was the Report Sent to FDA?: Yes
• Distributor Facility Aware Date: 06/03/2026
• Date Report to Manufacturer: 06/03/2026
• Initial Date Received by Manufacturer: Not provided
• Initial Report FDA Received Date: 06/28/2026
• 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: 06/29/2026