The device was returned.Visual and functional analysis was performed on the returned product.The reported difficulty preparing/flushing the device was unable to be confirmed.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 review of the complaint history identified no other similar complaints reported from this lot.The investigation was unable to determine a cause for the reported difficulty.It is possible that reported air bubble originated from the syringe during flushing, however, the syringe tip was not returned, and this could not be confirmed.There is no indication of a product quality issue with respect to the design, manufacture, or labeling of the device.
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