An investigation could not be performed because no device was returned, and it is unclear what stock number might have caused the problem as multiple devices were reported in the event.Review of the device history records was completed based on the product lot number identified.The dhr review showed no discrepancies or anomalies.It is unclear which stock number might have caused the problem, therefore complaint rate and review of the risk file were not performed.The failure root cause cannot be determined due to no device being returned.If further information is obtained that might add value to the contents of the investigation report, an additional follow-up report will be submitted.Related reports: mdr 9610905-2019-00087, mdr 9610905-2019-00089, mdr 9610905-2019-00090, mdr 9610905-2019-00091.Mdr 9610905-2019-00092.
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