MAUDE Adverse Event Report: NIHON KOHDEN ORANGEMED, LLC NIHON KOHDEN NKV-550 SERIES VENTILATOR SYSTEM; VENTILATOR, CONTINUOUS, FACILITY USE

Model Number	NKV-550-U
Medical Device Problem Code	Inappropriate or Unexpected Reset (2959)
Health Effect - Clinical Code	No Clinical Signs, Symptoms or Conditions (4582)
Date of Event	01/15/2026
Type of Reportable Event	Malfunction
Event or Problem Description
It was reported that during patient use, the ventilator displayed the following alarms: ¿backup battery fault¿ and ¿non-critical thread failure (bdu).¿ patient ventilation was not affected.The patient was removed from the ventilator and placed on another nkv-550 ventilator.There was no patient harm.Patient demographics will not be shared in accordance with hospital policy.
Additional Manufacturer Narrative
Nihon kohden orangemed llc will submit a supplemental report if additional information becomes available.

• Brand Name: NIHON KOHDEN NKV-550 SERIES VENTILATOR SYSTEM
• Common Device Name: VENTILATOR, CONTINUOUS, FACILITY USE
• Manufacturer (Section D): NIHON KOHDEN ORANGEMED, LLC; 1800 e. wilshire ave.; santa ana CA 92705
• Manufacturer (Section G): NIHON KOHEN ORANGEMED, LLC; 1800 e. wilshire ave.; santa ana CA 92705
• Manufacturer Contact: sheryl higgins ; 1800 e. wilshire ave.; santa ana, CA 92705 ; 949502644
• MDR Report Key: 24338810
• Report Number: 3014631252-2026-00011
• Device Sequence Number: 4812399
• Product Code: CBK
• UDI-Device Identifier: 00843685100012
• UDI-Public: (01)00843685100012(11)251114
• Combination Product (Y/N): N
• Initial Reporter Country: KS
• PMA/510(K) Number: K192307
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Serviced by Third Party (Y/N): Unknown
• Reporter Type: Manufacturer
• Report Source: Company Representative
• Initial Reporter Occupation: Biomedical Engineer
• Type of Report: Initial,Followup
• Report Date (Section B): 05/11/2026

1 Device was Involved in the Event

1 Patient was Involved in the Event

• Is this an Adverse Event Report?: No
• Is this a Product Problem Report?: Yes
• Device Model Number: NKV-550-U
• Was Device Available for Evaluation?: No
• Is the Reporter a Health Professional?: Yes
• Type of Report(Section G): Thirty-Day
• Initial Date Received by Manufacturer: 01/20/2026
• Supplement Date Received by Manufacturer: Not provided
• Initial Report FDA Received Date: 02/13/2026
• Supplement Report FDA Received Date: 05/11/2026
• Was Device Evaluated by Manufacturer? (Y/N): Yes
• Date Device Manufactured: 11/14/2025
• Is the Device Labeled for Single Use? (Y/N): No
• 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: Other
• Patient Sex: Unknown