MAUDE Adverse Event Report: NXSTAGE MEDICAL, INC. NXSTAGE SYSTEM ONE; HIGH PERMEABILITY HEMODIALYSIS SYSTEM

Model Number	CAR-170-C
Medical Device Problem Code	Adverse Event Without Identified Device or Use Problem (2993)
Health Effect - Clinical Codes	Dyspnea (1816); Hypersensitivity/Allergic reaction (1907); Itching Sensation (1943); Urticaria (2278)
Date of Event	02/23/2026
Type of Reportable Event	Serious Injury
Event or Problem Description
A report was received on 04 mar 2026 from the home therapy nurse (htn) of a 75 year old female patient with a medical history including hypertension and end stage renal disease, who stated the patient experienced hives, itchiness and difficulty breathing during a in-center hemodialysis treatment on (b)(6) 2026.Additional information was received on 06 mar 2026 from the htn who stated the patient was administered oxygen, methylprednisolone (solu-medrol) 125mg, and diphenhydramine (benadryl) 50mg intravenously.The patient was sent to the emergency room, evaluated and discharged.Following the event, the patient recovered without sequelae and continues to treat with the nxstage system.
Additional Manufacturer Narrative
A review of the device history record (dhr) was conducted which confirmed that the device met all quality criteria and manufacturing specifications prior to release.The event is consistent with a hypersensitivity type reaction.Hypersensitivity or allergic adverse reactions are known risks of hemodialysis.The nxstage user guide and instructions for use include allergic reaction as a potential risk associated with dialysis therapy and also include warnings to monitor for potential allergic reactions.Biocompatibility of the device has been established.The patient experienced an event consistent with a hypersensitivity reaction with the lot number (40977060) on one additional date.The event on (b)(6) 2026 is documented in mfr report # 3003464075-2026-00021.

• Brand Name: NXSTAGE SYSTEM ONE
• Common Device Name: HIGH PERMEABILITY HEMODIALYSIS SYSTEM
• Manufacturer (Section D): NXSTAGE MEDICAL, INC.; 350 merrimack street; lawrence MA 01843
• Manufacturer (Section G): MEDIMEXICO S. DE R. L. DE C. V; av. valle imperial no. 10523; parque industrial valle sur; tijuana 22180 ; MX 22180
• Manufacturer Contact: paula rogalski ; nxstage medical, inc.; 350 merrimack street; lawrence, MA 01843 ; 9784505276
• MDR Report Key: 24557754
• Report Number: 3003464075-2026-00022
• Device Sequence Number: 15668640
• Product Code: KDI
• UDI-Device Identifier: M535CAR170C0
• UDI-Public: +M535CAR170C0/$$0426409770607
• Combination Product (Y/N): N
• Initial Reporter State: PR
• Initial Reporter Country: US
• PMA/510(K) Number: K140526
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Serviced by Third Party (Y/N): Unknown
• Reporter Type: Manufacturer
• Report Source: Health Professional
• Initial Reporter Occupation: Nurse
• Type of Report: Initial
• Report Date (Section B): 03/10/2026

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: Health Professional
• Device Expiration Date: 04/01/2026
• Device Model Number: CAR-170-C
• Device Catalogue Number: CAR-170-C
• Device Lot Number: 40977060
• 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: 03/04/2026
• Initial Report FDA Received Date: 03/10/2026
• Was Device Evaluated by Manufacturer? (Y/N): No
• Date Device Manufactured: 10/15/2024
• Is the Device Labeled for Single Use? (Y/N): Yes
• Is This a Single-Use Device that was Reprocessed and Reused on a Patient? (Y/N): No
• Usage of Device: Initial
• Patient Sequence Number: 1
• Outcome Attributed to Adverse Event: Required Intervention
• Patient Age: 75 YR
• Patient Sex: Female
• Patient Weight: 63 KG