(b)(4).The device was returned for analysis.The reported leak and the reported device operates differently/noise were 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 incidents from this lot.It is possible that the devices were not properly aligned while attempting to connect thus resulting in the reported leak and the reported device operates differently/sputtering sound; however this cannot be confirmed.The investigation was unable to determine a conclusive cause for the reported leak and the reported noise.Additionally, a conclusive cause for the reported patient effects, and the relationship to the product, if any, cannot be determined.There is no indication of a product quality issue with respect to manufacture, design or labeling.
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