Unique device identifier (udi)- (b)(4).The cranial access kit was returned for evaluation: device history record (dhr) - no anomalies occurred at the time of manufacture of the hand drill itself, or during the assembly of the kit at final kitting.Failure analysis- the returned unit was found to work as intended, and met all acceptance criteria.Three returned units were tested using the testing media for inspection with both bits which come standard in the cranial access kits.Additionally, it was confirmed that the gearing ratio was performing as intended.The root cause is undetermined and was unable to be confirmed in the complaint evaluation.
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