(b)(4).Integra investigation completed.Manufacture date unknown.Method: failure analysis, device history evaluation results: failure analysis - there is one rhoton-type hook returned in used condition, showing minimal wear.Inspected the hook and the tip is broken off, this is a very delicate instrument and could have happened while in use or even dropped.This complaint is confirmed/root cause undetermined.Device history evaluation - nonconforming product report / nonconforming material report history: there is no applicable nonconforming product report / nonconforming material report history.Variance authorization / deviation history: none.Engineering change order/manufacturing change order history: there is no applicable engineering change order/manufacturing change order history.Corrective action preventive action history: none.Health hazard evaluation history: none.Conclusion: the root cause has not been identified as a workmanship or material deficiency.
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