MAUDE Adverse Event Report: INOGEN INC. INOGEN ONE G4 BLUETOOTH PORTABLE OXYGEN CONCENTRATOR

Model Number	IO-400
Medical Device Problem Code	Insufficient Flow or Under Infusion (2182)
Health Effect - Clinical Code	Low Oxygen Saturation (2477)
Date of Event	06/05/2026
Type of Reportable Event	Serious Injury
Additional Manufacturer Narrative
B3 date of event is estimated.The unit was returned for evaluation on 22-jun-2026.The unit received a noise complaint.The issue was confirmed, and the filter assembly was found to be improperly installed.Data logs indicated a low 02 condition caused by a leak in the product manifold due to debris under the check valve.The zeolite had absorbed excessive moisture, resulting in column contamination.The uip had scratches, likely caused by rough cleaning.
Event or Problem Description
It was reported that the patient's unit was not producing enough oxygen and it was noisy.As a result, the patient's oxygen levels had dropped.Replacement columns were sent to the patient to resolve the issue.The inogen team attempted to contact the patient for further information three times with no response.

• Brand Name: INOGEN ONE G4 BLUETOOTH PORTABLE OXYGEN CONCENTRATOR
• Common Device Name: INOGEN ONE G4 BLUETOOTH PORTABLE OXYGEN CONCENTRATOR
• Manufacturer (Section D): INOGEN INC.; 600 shiloh rd; plano TX 75074
• Manufacturer (Section G): INOGEN INC.; 600 shiloh rd; plano TX 75074
• Manufacturer Contact: greg porter ; 600 shiloh rd; plano, TX 75074
• MDR Report Key: 25726619
• Report Number: 3004672275-2026-00190
• Device Sequence Number: 20252784
• Product Code: CAW
• UDI-Device Identifier: 00817131020179
• UDI-Public: (01)00817131020179
• Combination Product (Y/N): N
• Initial Reporter State: WI
• Initial Reporter Country: US
• PMA/510(K) Number: K032818
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Serviced by Third Party (Y/N): Unknown
• Reporter Type: Manufacturer
• Report Source: Consumer
• Initial Reporter Occupation: Non-Healthcare Professional
• Remedial Action: Replace
• Type of Report: Initial
• Report Date (Section B): 07/06/2026

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?: Yes
• Operator of Device: Lay User/Patient
• Device Model Number: IO-400
• Was Device Available for Evaluation?: Device Returned to Manufacturer
• Date Returned to Manufacturer: 06/22/2026
• Type of Report(Section G): Thirty-Day
• Initial Date Received by Manufacturer: 06/08/2026
• Initial Report FDA Received Date: 07/06/2026
• Was Device Evaluated by Manufacturer? (Y/N): Yes
• Date Device Manufactured: 06/06/2023
• 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
• Usage of Device: Unknown
• Patient Sequence Number: 1
• Outcome Attributed to Adverse Event: Life Threatening
• Patient Sex: Unknown