(b)(4).Evaluation summary: visual inspection was performed on the returned device.The reported difficulty tightening the clamp seal was confirmed due to the broken cap.It may be possible that during tightening of the clamp seal, the cap was over-rotated causing the threaded portion of the cap to break; however, this could not 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 of the reported lot revealed no other incidents.The investigation was unable to determine a cause for the broken cap.There is no indication of a product quality issue with respect to the design, manufacture, or labeling of the device.
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