MAUDE Adverse Event Report: CHRISTOPH MIETHKE GMBH & CO KG M.BLUE 0 VALVE; HYDROCEPHALUS MANAGEMENT

Model Number	FX800T
Medical Device Problem Codes	Infusion or Flow Problem (2964); Physical Resistance/Sticking (4012)
Health Effect - Clinical Code	Hydrocephalus (3272)
Date of Event	04/08/2026
Type of Reportable Event	Serious Injury
Additional Manufacturer Narrative
Visual inspection.During the investigation, scratches on the outer housing of the m.Blue were determined permeability test: a permeability test has shown that the m.Blue is permeable.Computer controlled test: to investigate the claim of over- drainage, the opening pressure is measured using a miethke computer controlled testing apparatus which simulates a cerebrospinal fluid flow.The valve is tested in both the horizontal as well as the vertical positions.The results show that the m.Blue operates within the accepted tolerance in the vertical position, but not in the horizontal position.A reduced outflow of m.Blue in the horizontal position was determined.Adjustment test: the m.Blue valve was tested and is partially adjustable from 30 to 36 cmh2o.Braking force and brake function test: the brake functionality test has shown that the brake function is operational.However, the braking force cannot be measured due to the partially adjustable of the valve.Internal inspection: after dismantling of the valve, organic deposits were found.Results: according to the investigation results, a limited adjustability and a reduced outflow in the horizontal position of the m.Blue were determined.The visible deposits led to the functional deviations.Deposits caused by substances naturally present in the patient's body, such as protein, blood or tissue particles, are among the known and unavoidable risks and side effects of hydrocephalus therapy.Even small amounts of organic material can affect the integrity of the valve.The examination of the return has been completed with the drafting of this report.
Event or Problem Description
It was reported that an m.Blue valve (#fx800t) was implanted.According to the complainant, the valve caused an overdrainage and had adjustment difficulties.The patient underwent a revision procedure on (b)(6) 2026.No patient complications were reported as a result of the revision procedure.

• Brand Name: M.BLUE 0 VALVE
• Common Device Name: HYDROCEPHALUS MANAGEMENT
• Manufacturer (Section D): CHRISTOPH MIETHKE GMBH & CO KG; ulanenweg 2; potsdam, 14469 ; GM 14469
• Manufacturer (Section G): CHRISTOPH MIETHKE GMBH & CO KG; ulanenweg 2; potsdam, 14469 ; GM 14469
• Manufacturer Contact: joerg knebel ; ulanenweg 2; potsdam, 14469 ; GM 14469
• MDR Report Key: 25070497
• Report Number: 3004721439-2026-00118
• Device Sequence Number: 10470918
• Product Code: JXG
• UDI-Device Identifier: 04041906504397
• UDI-Public: (01)04041906504397(11)240726(17)290724(10)20076758
• Combination Product (Y/N): N
• Initial Reporter Country: UK
• PMA/510(K) Number: K192266
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Explanted Year: 2026
• Serviced by Third Party (Y/N): N
• Reporter Type: Manufacturer
• Report Source: Foreign,User Facility,Company Representative
• Initial Reporter Occupation: Other Health Care Professional
• Type of Report: Initial
• Report Date (Section B): 05/04/2026

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: Health Professional
• Device Model Number: FX800T
• Device Catalogue Number: FX800T
• Device Lot Number: 20076758
• Was Device Available for Evaluation?: Device Returned to Manufacturer
• Date Returned to Manufacturer: 04/14/2026
• Is the Reporter a Health Professional?: Yes
• Type of Report(Section G): Thirty-Day
• Initial Date Received by Manufacturer: 04/08/2026
• Initial Report FDA Received Date: 05/04/2026
• Was Device Evaluated by Manufacturer? (Y/N): Yes
• Date Device Manufactured: 07/26/2024
• 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: 5 YR
• Patient Sex: Female
• Patient Weight: 35 KG