The actual sample was returned to the manufacturing facility.The main body of the device and a fractured piece of the shaft were returned for evaluation.They were measured and the detailed results were obtained as follows: (1) distal segment approx.148mm; (2) inner lumen-exposed and stretched segment approx.252mm; (3) stainless steel reinforcement-exposed and stretched segment approx.136mm; (4) stretched shaft segment approx.87mm; and (5) the main body measures approx.385mm.Due to severe damage and elongation on the shaft, it cannot be determined if there is separated and missing part of the shaft.Magnifying inspection obtained the below findings: there was no break on the distal part, the outer and inner layers had been elongated, exposing the stainless steel reinforcement, due to the stainless steel reinforcement having been elongated in the distal direction, only the outer and inner layers remained, and the inner layer had been elongated and exposed.Electron microscopic inspection did not find any cut or scratch which could be a trigger of the fracture on the surface.Magnifying inspection of the distal end of the fractured piece revealed the generation of several scratches.The stainless steel reinforcement on the segment adjacent to the fracture was inspected under electron microscope and found not to have any deformed portion.There is no evidence that this event was related to a device defect or malfunction.Although the exact cause cannot be determined based on the available information, the appearance of the involved sample is most consistent with the actual sample being subjected to a pulling force when the customer tried to pull it back in the proximal direction in the state of its distal segment being stuck in an object due to some factor(s), resulting in the fracture of the shaft.The device labeling does address the potential for such an event by stating in the instructions-for-use: "monitor the manipulation of the microcatheter system in the vessel by confirming the position of the catheter tip/guide wire through a high resolution fluoroscope and a digital subtraction angiography monitor.If any resistance is felt in the vessel, do not advance or withdraw the microcatheter system until the cause of resistance is determined through a high resolution fluoroscope and a digital subtraction angiography monitor.Manipulating the catheter or the guide wire against resistance may result in damaging the vessel, the catheter or the guide wire.If the situation is not solved, withdraw the entire system of the catheter or the guide wire with the guiding catheter." all available information has been placed on file in quality assurance at the manufacturing facility for appropriate tracking, trending and follow-up.(b)(4).
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