During processing of this complaint, attempts were made to obtain complete event, patient and device information.There was no leak noted during preparation prior to use, which suggests a product quality issue did not contribute to the reported difficulties.Patient anatomy especially lesion morphology such as highly calcified & narrow lesion, vessel tortuosity, thrombus burden can likely contribute to the crossing/withdrawal difficulties.Patient had very tortuous vessels.Aforesaid tortuous vessel might have offered high resistance while maneuvering the catheter system which led to the reported problem.Returned product analysis reveals a kink on the proximal shaft near the luer hub.Such type of kink is associated with excessive force being applied on balloon catheter during use.Review of device history records including raw material inspection, in process & finished product inspection does not reveal any discrepancy relevant to batch under investigation which conform that there is no indication of a product related quality deficiency associated to this batch.It might be possible that highly tortuous vessel offered high resistance during lesion crossing that led to the reported case.However, as clinical situation cannot be duplicated in our analysis lab, the exact root cause of the difficulty could not be determined.
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