(b)(4).No product at hand.Batch history review: a review of the device quality and manufacturing history records was not possible because the lot number is unknown.Conclusion and root cause: no product available, therefore a conclusion and root cause cannot be conclusively defined.Based on the information available as well as a result of our investigation the root cause of the failure is most probably related to an insufficient usage.Rationale: based on the quality standards and the device history record we exclude a material or manufacturer caused error.Without the product, we cannot determine the exact cause.If further investigations are required, the product should be provided for examination.No capa is necessary.If additional information is received a follow up report will be submitted.
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