The clinical observation was confirmed.Visual inspection of the returned device found no kinks, bends, or deformities in the catheter shaft.The balloon was found to be partially inflated during visual inspection and an attempt to remove air from the balloon was unsuccessful.An attempt to flush the balloon lumen was also unsuccessful.Blockages in the form of a clear/whitish crystalline material were found to be completely occluding the lumen.The crystalline material is consistent with water-soluble crystallized contrast medium.The root cause of the inflation and deflation difficulty is unable to be determined; however it is possible that an application issue in relation to this crystalline material could have contributed.Manufacturing records were reviewed and there were no related manufacturing non conformances identified.The instructions for use, training, and risk control measures are appropriate at this time.Trends will continue to be monitored through the edwards quality system.
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