(b)(4).The device was not returned for evaluation.A review of the lot history record identified no manufacturing nonconformities issued to the reported lot that would have contributed to this event.Additionally, a query of the complaint handling database for the reported lot revealed no indication of a lot specific product quality issue.It should be noted the emboshield nav6 embolic protection system electronic instructions for use (eifu) warns: ¿only use the barewire filter delivery wires.Use of other guide wires will lead to loss of the filtration element or an inability to retrieve the filtration element.¿use of the incorrect guidewire contributed to the reported difficulties.Based on the information provided, the investigation determined that the reported difficulties were user related.The difficulty retrieving the filter was due to the user advancing the emboshield nav6 onto a command guidewire and failing to use the provided barewire filter delivery wire as instructed in the product ifu resulting in the need for additional unexpected medical intervention to retrieve the filter.There is no indication of a product quality issue with respect to the design, manufacture, or labeling of the device.
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