(b)(4).Investigation results: a visual examination of the returned complaint device found that the balloon and the catheter of device had no damages.Microscopic inspection was done and found that the balloon burst, which confirms the reported event of balloon leak.The balloon was noted to have some marks in the proximal side.Functional analysis was performed, and the balloon was inflated without a problem; however, the balloon would not hold pressure due to a burst in the proximal section on the body of the balloon.It is possible that factors encountered during the procedure, such as the interaction with scope or any other surface during the procedure could create friction on the balloon, caused the balloon burst.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.
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