Mayfield 2000 skull clamp (a2000) was returned for evaluation: device history record (dhr) - the dhr was reviewed and shows no abnormalities related to the reported failure.Failure analysis - investigation of the returned unit showed that there were damaged threads on the torque knob and the rotator teeth assembly.The torque knob and rotator teeth assembly were replaced as a result.General cleaning and maintenance performed.Root cause - the complaint is confirmed via inspection of the unit.Probable root cause is rough or improper handling of the unit.No further investigation is required based on the acceptability of risk and no adverse trends were identified.This will be monitored and trended going forward.At present, we consider this complaint to be closed.
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