It was intended to treat a severe calcified lesion (stenosis degree 95%) in the proximal lad.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 technical investigation revealed that the balloon has obviously been inflated.However, microscopic inspection revealed a pinhole in the proximal part of the balloons and scratches in the balloon surface were observed nearby.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.Based on the conducted investigations of the device being subject to this complaint, no manufacturing or material related root cause was determined.The final root cause for the reported event is most likely related to the severe calcification of the vessel.
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