(b)(4).Results: operational problem - the root cause is related to the direction of the folding pleats which appear not to be folded parallel to the shaft of the device.Once inside the artery, the folding pleats most likely encounter resistance related to a tight lesion, resulting an incomplete balloon expansion.Conclusion: operational context caused or contributed to event - the root cause is related to the direction of the folding pleats which appear not to be folded parallel to the shaft of the device.Once inside the artery, the folding pleats most likely encounter resistance related to a tight lesion, resulting an incomplete balloon expansion.Device evaluation: a visual and a tactile inspection was carried out on the returned device: dry blood was found on the device and inside the guide wire tube and a twist was found on the balloon at 42 mm from the tip.The visual inspection did not report any other issue on the device.The device was flushed and a 0.018¿ guidewire was successfully advanced through the device from the tip to the luer.During the analysis, negative pressure was applied with a manometric syringe on the balloon: the purging test did not pass, since bubbles emerged in the water column.Afterwards, an attempt to inflate the balloon was performed, in order to detect the leakage.Signs of a longitudinal burst was detected.
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