Updated fields: d10, g4, g7, h2, h3, h4, h6, h10.Unique device identifier (udi) : (b)(4).Mayfield skull clamp was returned for evaluation.Device history record (dhr) - the dhr shows no abnormalities related to the reported failure.The reported complaint was not confirmed from the evaluation of the returned product.No issues observed from the functional testing of the testing and the reported failure could not be duplicated.When unit is properly positioned and put under pressure unit would not have slipped.The observed condition is likely caused improper handling.The definite root cause cannot be reliably determined.
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