The returned instrument was subjected to a detailed technical analysis and the corresponding production documentation was reviewed to establish whether a deviation from the manufacturing process could be the cause for this event.The complaint device was returned in two parts.The balloon shows a transversal fracture in the center of the cylindrical balloon part.The inner shaft has ruptured proximal to the proximal x-ray marker and is severely elongated in the distal device fragment.The distal part of the balloon is compacted, indicating that this part of the balloon got caught on the distal end of the introducer sheath during the withdrawal attempt.Microscopic analysis of the balloon surface showed several scratches parallel to the fracture site on the proximal balloon fragment.No parts of the balloon are missing.The review of the production documentation of the product detailed above verified that the instrument was manufactured according to specifications and fulfilled all the requirements of in-process and final inspection.In addition to visual inspections each instrument is tested for air tightness by means of a helium leak test.We can therefore confirm that the instrument was delivered in a leak-proof condition.The conducted technical investigations and review of the production documentation did not reveal a material defect or manufacturing deviation.Due to the transversal scratch marks in close vicinity of the fracture site it is most probably that the rupture of the balloon was induced by the patient conditions.
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