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(b)(4).Investigation results: a visual examination of the returned complaint device found that the balloon and the catheter of the device had no damages.Microscopic analysis was performed, and it was noticed that the balloon had a pinhole, which confirms the reported event of balloon failed to inflate.Functional evaluation was performed and the balloon was inflated without problem; however, the balloon would not hold pressure due to the pinhole located at the distal section on the body of the balloon.It is possible that factors encountered during the procedure, such as the interaction with any surface during the procedure could create friction on the balloon, caused the balloon pinhole.Therefore, the most probable root cause is adverse event related to procedure.A review of the device history record (dhr) was performed and confirmed that this device met all material, assembly and performance specifications.A labeling review was performed and from the information available, this device was used per the instructions for use (ifu)/product label.
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