This report is being submitted as follow up no.1 to provide the device return date in section d9, update section h3, and to provide the completed investigation results.The actual device was returned.Actual samples upon receipt were the main body of the catheter and a fragment.Visual inspection of the actual samples found the length of the main body to be approximately 1065 millimeters (mm).Length of the fragment was approximately 155 mm.Total length was approximately 1220 mm.From this, it was thought that there was no portion missing from the actual samples in comparison with a current product.Magnifying inspection of the actual sample found that a compressed mark was observed near the distal end of fragment.The fracture of the fragment seemed to have been torn off.At the fracture of main body, the outer layer had been stretched and seemed to have been torn off.Reinforcement was exposed at the fracture of the main body.The outer layer at the fracture of both portions were similar in shape partially.Based on these results, and the similar shape of the fractured outer layer, it was considered that there was no portion missing from the actual samples.No anomaly in appearance such as a compressed mark or a scratch in other parts.At the fracture of the fragment, no exposure of reinforcement was observed.Electron microscopic inspection of the actual sample found the fragment had creases and traces of possible contact with some hard object in the compressed part near the distal end.From this, it was inferred the possibility that the actual sample came into contact with some hard object and caught on it.X-ray fluoroscopic inspection of the actual samples found the fracture had occurred at the distal end of reinforcement.The dimensions obtained the following results.The outer diameter of the undamaged part was within our control standard.No anomaly was observed.The inner diameter of the undamaged part was within our control standard.No anomaly was observed.Considering the possibility that the distal end of the actuals sample came into contact with a hard object, caught on it, and exposed to pulling force, leading to the fracture, the following simulation test was conducted.A factory-retained 4fr glidecath was combined with a 0.035" guidewire, the distal end was fixed, and then a pulling force was applied.Magnifying inspection of the condition of simulation sample found that it was fractured at approximately 155mm from the distal end.The area near the distal end where it had been fixed was compressed.The outer layer at the fracture of both portions was stretched and in a torn-off shape.At the fracture of the main body, reinforcement was exposed.At the fracture of the fragment, reinforcement was not exposed.From this, it was thought that the fracture occurred at the distal end of reinforcement.The state of simulation sample, with the compressed mark near the distal end and the fracture having occurred at the distal end of reinforcement, was similar to the state the actual sample.It was considered that the difference in the state of fracture surface observed, such as elongation, was due to the difference in the level of tensile force applied and the operation method.Based on the condition of the actual sample and description of the event, the following mechanism of occurrence was estimated.The part of the actual sample near the distal end might have come into strong contact with the lesion and caught on it.In order to release the caught state, strong pulling force was applied.As a result, the inner and outer layers were torn off at the distal end of the reinforcement, which is the part where the physical property of the catheter tube changes, leading to the fracture.Besides, the total length of the main body and the fragment were compared with that of a current product and concluded that there was no portion missing from the actual sample.Ashitaka factory manufacturing process assures the quality of this product by performing following inspections.After the shaft is molded on the core wire whose outer diameter is controlled, the core wire is removed to assure the inner diameter of shaft.Before the packaging, 100% magnifying inspection is performed to confirm that there is no anomaly such as a scratch or crush on the catheter.In the packaging and cartoning processes, dedicated tools and containers are used for handling this product to protect it and to prevent it from crushing.The instructions for use (ifu) of this product includes the following information: "[directions for use] 5 /warning never advance or withdraw an intraluminal device against resistance until the cause of resistance is determined by fluoroscopy.Failure to exercise proper caution may result in damage to the vessel or catheter.Separation of the catheter may occur requiring retrieval in some cases.".
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