The balloon was still folded and showed no signs of inflation at the time the device was returned for investigation.Microscopic investigation of the gep revealed that the guide wire lumen and the inflation lumen are sliced open.Therefore, the stent could not be inflated.The described observation was most probably induced by the guide wire during the procedure.The leakage of the inflation lumen is presumably a direct consequence of the guide wire exit port lying outside of the guiding catheter which is warned against in the ifu.Further the device was used against the indication outlined in the ifu.A review of the production documentation for 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 manufactured according to specification and delivered in a leak proof condition.Based on the conducted investigations of the device being subject to this complaint, no material or manufacturing related root cause was determined.
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