The device history records (dhr) of the device concerned was reviewed: the production lot, to which the device concerned belongs, passed all in-process inspections for every product, and the finished product inspections on representative samples based on sampling plan.No nonconformity or abnormality in the manufacturing processes of the device concerned was found.Probable cause(s) and our comment: we speculate the reported situation as follows: because it is used in calcified lesions, the rupture occurred because the balloon was damaged at the hard part of the lesion.Further, the operation was not possible at the lesioned part or the tip of the combined device (for example, gc), and when the catheter was removed from the stucked state, the balloon was broken by an excessive tensile force.This was considered a malfunction caused by the procedure.
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