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The devices were both returned for evaluation.A visual inspection found frayed fibers on the balloons.The devices were inflated during functional testing and water was seen exiting from the balloons.The fibers were removed, and a longitudinal rupture was identified on the first device; pinhole rupture was identified on the second.Therefore, the investigation is confirmed for frayed material, as well as a longitudinal rupture.Per the reported event details, a wall stent was present during the procedures.Therefore, it is possible that patient and/or procedural issues contributed to the alleged malfunctions.However, the definitive root cause for the identified frayed material and longitudinal rupture could not be determined based upon available information.
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