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The user facility reported that during an abdominal aortogram with runoff via the right femoral artery, when attempting to cross a lesion in the left superficial femoral artery (sfa) with a navicross catheter and stiff angled glidewire, a portion of the tip of the wire sheared off.The piece was attempted to be removed but could not be done.The patient would have bypass surgery as endovascular recanalization was unsuccessful.The patient was in stable condition.The procedure outcome was completed.
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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.H6: investigation findings - 3211 is based upon evaluation of user facility information and the visual inspection of the returned sample; 3252 & 114 is based upon the simulation testing.Visual inspection of the actual sample obtained the following results: i) the distal end had been fractured; ii) the total length was 2585 mm.As the normal length is 2600 mm, the actual sample was considered to be missing approximately 15 mm.Under a magnifier it revealed that the entire edge of the fracture seemed to have been pulled and torn.Electron microscopic inspection was conducted on the actual sample and found some dents and creases on the outer layer surface.Electron microscopic inspection of the core wire removed from the outer layer revealed that the distal end had not been deformed in taper and there was radial pattern on the fracture surface.The outer diameter of the actual sample was measured and confirmed to meet the factory's control standards.Simulation test and mechanism of fracture of guidewires were conducted.It is known from our past experiments that the guidewire may get fractured when it has been subjected to one of the loads described below, in addition, as for the core wire, the state of the fractured end presents some regularity depending on the fracture mechanism.Repetitive bending load at a 90-degree angle revealed that the fractured ends are not deformed in taper or curved, but dimple pattern is observed on the fracture surface.This state was like that observed on the actual sample.Continuous one-way torque load to a test sample kept in a curve shape revealed that the fractured ends are not deformed in taper or curved, but radial pattern is observed on the fracture surface.From this, it was presumed that the actual sample was not fractured by this mechanism.One-way pulling load revealed that the fractured ends have been deformed in taper.From this, it was presumed that the actual sample was not fractured by this mechanism.Pulling load to a loop-shaped test sample revealed that the fractured ends have been curved and deformed in taper.From this, it is presumed that the actual sample was not fractured by this mechanism.From the results of the investigation, it was likely that a bending load at a 90-degree angle was applied to the actual sample repeatedly while it was in the state of being curved during use, which resulted in the fracture of core wire due to metal fatigue.After that, it was presumed that the outer layer was torn off when the actual sample was subjected to a pulling load during withdrawal, which resulted in the complete breakage into two pieces.Ashitaka factory assures the quality of this product by implementing the following inspections and control.I) eddy current flaw detection is performed at our supplier to assure the integrity of the core wire for this product.Ii) the outside diameter of the core wire is strictly controlled to assure the strength of the core wire; iii) 100% visual inspection is performed before the packing process to assure there is no external anomaly such as a kink.Reference the following warning included in the ifu of this product: "if any resistance is felt or if the tip's behavior and/or location seems improper, stop manipulating the glidewire and/or the catheter and determine the cause by fluoroscopy.Failure to exercise proper caution may result in bending, kinking, separation of the guide wire's tip, damage to the catheter, or damage to the vessel." terumo medical products (tmp) (importer) registration no.2243441 is submitting this report on behalf of ashitaka factory of terumo corporation (manufacturer) registration no.9681834.
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