(b)(4).Other serious - the user facility information indicated that the patient suffered a mild stroke during the procedure.The actual device was not returned for evaluation and the involved lot number is unknown.Therefore, the investigation and evaluation were limited to user facility information and evaluation of a retention sample.Visual inspection did not find any anomalies, including a kink or break, along the total length of the shaft.Magnifying inspection did not find any anomalies, including a scratch or exposure of the braided wire, which could cause thrombus to form.The inside and outside diameters were measured and product specifications were met.Electron microscopic inspection of the inner and outer surfaces of the shaft did not reveal any anomalies which could cause the formation of thrombus.Based on user facility information and evaluation results of the retention sample, the cause for the reported event cannot be definitively determined.All available information has been placed on file in quality assurance at the manufacturing facility for appropriate tracking, trending and follow-up.(b)(4).Device not available.
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