MAUDE Adverse Event Report: BIOTRONIK SE & CO. KG BIOMONITOR III; IMPLANTABLE CARDIAC MONITOR

Model Number	436066
Medical Device Problem Code	Failure to Interrogate (1332)
Health Effect - Clinical Code	No Clinical Signs, Symptoms or Conditions (4582)
Date of Event	10/23/2025
Type of Reportable Event	Malfunction
Event or Problem Description
This device was explanted due to unable to interrogate.No adverse patient events were reported.Should additional information become available, this file will be updated.
Additional Manufacturer Narrative
The device was not returned for analysis.The analysis is thus based on the inspection of the quality documents associated with the manufacture of this particular device as well as the data returned for evaluation.The manufacturing process for this device was reviewed and all production steps were performed accordingly.There was no sign of any inconsistency during the manufacturing process.Particularly the final acceptance test proved the device functions to be as specified.The available data were thoroughly inspected.The inspection of the ram dump revealed a memory loss.The home monitoring data showed an unexpected drop of the battery voltage.Based on the data available for analysis the root cause for that behavior was not determinable and can only be clarified by an analysis of the device itself.However, it cannot be excluded that this occurrence resulted from a defective component.Should the device become available for analysis, this investigation will be updated.
Additional Manufacturer Narrative
The device was received for analysis.Prior to the analysis of the device, the quality documents accompanying the manufacturing process for this device were reviewed and all production steps were performed accordingly.In particular, the final acceptance test proved the device functions to be as specified.Upon receipt, the device was subjected to an electrical analysis, revealing that the device could not be interrogated with a programmer.Therefore the device was opened and subjected to further investigation.The visual inspection of the inner assembly showed no anomalies.In a next step, the battery was disconnected from the electronic module.Further thorough investigation of the electronic module did not show any anomalies.In particular the current consumption proved to be normal and expected.The battery was sent to the manufacturer for further analysis.The manufacturing records of the battery were inspected, documenting that the battery parameters were within specification during the manufacturing.The battery was subjected to an electrical inspection as well as a microcalorimetry analysis.The microcalorimetry analysis showed a normal heat dissipation.In a next step, the battery was opened for destructive analysis.Inspection of the inner assembly revealed evidence of an internal short circuit, which led to an elevated internal self-depletion within the battery and therefore contributed to the clinical observation.In conclusion, an elevated internal self-depletion within the battery was found to be the root cause for the clinical observation.

• Brand Name: BIOMONITOR III
• Common Device Name: IMPLANTABLE CARDIAC MONITOR
• Manufacturer (Section D): BIOTRONIK SE & CO. KG; woermannkehre 1; berlin 12359 ; GM 12359
• Manufacturer Contact: 6024 jean road; lake oswego, OR 97035 ; 8772459800
• MDR Report Key: 23647769
• Report Number: 1028232-2025-05745
• Device Sequence Number: 17335783
• Product Code: MXD
• UDI-Device Identifier: 04035479158453
• UDI-Public: (01)04035479158453(17)221130
• Combination Product (Y/N): N
• Initial Reporter State: NC
• Initial Reporter Country: US
• PMA/510(K) Number: K190548
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Implanted Year: 2022
• Device Explanted Year: 2025
• Serviced by Third Party (Y/N): N
• Reporter Type: Manufacturer
• Report Source: Company Representative
• Initial Reporter Occupation: Non-Healthcare Professional
• Type of Report: Initial,Followup,Followup
• 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?: No
• Is this a Product Problem Report?: Yes
• Operator of Device: Health Professional
• Device Expiration Date: 11/30/2022
• Device Model Number: 436066
• Device Catalogue Number: 436066
• Was Device Available for Evaluation?: Device Returned to Manufacturer
• Type of Report(Section G): Thirty-Day
• Initial Date Received by Manufacturer: 11/20/2025
• Supplement Date Received by Manufacturer: 11/26/2025; 07/06/2026
• Initial Report FDA Received Date: 11/25/2025
• Supplement Report FDA Received Date: 12/01/2025; 07/06/2026
• Was Device Evaluated by Manufacturer? (Y/N): Yes
• Date Device Manufactured: 05/03/2021
• 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: Hospitalization
• Patient Age: 55 YR
• Patient Sex: Male