Siemens has completed an investigation of the reported event.The root cause was determined to be a hardware error.The mechanical end stops were missing on one side of the monitor's ceiling rail system which led to the problem reported.The end stops are mechanical end stops that normally limit the movement of the monitor's non-motorized ceiling carriage.The ceiling carriage is used to move the entire ceiling pendant, including the monitor, to the desired position away from the patient.To do this, the user manually pulls the stand into the desired position or is stopped at the end of the rails by the mechanical end stops mentioned above.In the given case, these end stops were not correctly attached according to the instructions, which led to the overhead trolley slipping out on one side.In this condition, the unit is no longer operational and service intervention is necessary.Whether the end stops were present at all at the time of the incident could not be clarified by the investigation, especially since they could not be found during the inspection of the system.However, chatter marks or imprints of the associated mounting screws prove that both end stops had previously been mounted in the parallel ceiling rails.Who ultimately removed them and for what purpose could not be clarified by the investigation.The system had been improperly modified and no longer complied with the specification.Both the on-site investigation and the detailed investigation at the factory revealed that this was neither a design problem nor a systematic problem, but rather a one-time, individual work error by the person performing the work, who acted contrary to the installation instructions and removed the end stops.The system was inspected by the local technical department, repaired and the functionality was finally tested.A possible general error, which would require corrective measures of the installed base, could not be determined by the investigation.After detailed investigation, the incident is not classified as a reportable event as neither serious injury, death nor an unexpected, prolonged hospitalization of the patient or any other person occurred or could be expected.
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