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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