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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 - code 3211 is based upon the evaluation of user facility information and the returned sample; code 114 is based upon testing of the returned sample.Visual inspection of the actual samples obtained the following results.I) the actual samples were the guidewire (referred to as the main body) and two black fragments (fragment 1 and fragment 2).Ii) exposure of the core wire was observed on the main body where approximately 1008 - 1022 millimeters from the distal end.Iii) fragment 1 and fragment 2 were confirmed to measure approximately 10 millimeters and 8 millimeters respectively.Magnifying inspection of the main body obtained the following results.I) the edge of the outer layer had been elongated at approximately 1008 millimeters and 1022 millimeters from the distal end.Ii) a streak mark was observed on the exposed core wire.Iii) a contact mark was observed at approximately 1040 millimeters from the distal end, and multiple abrasions were observed in the lengthwise direction on the proximal side of the exposed core wire.Iv) the surface of the main body was found glossy.Electron microscopic inspection obtained the following results.I) multiple creases and torn shape were observed on the edges of the outer layer at approximately 1008 millimeters and 1022 millimeters from the distal end.Ii) a dent was observed on the outer layer at approximately 1040 millimeters from the distal end and multiple creases were observed near the dent.Iii) the abrasions were found to have occurred toward the proximal end.Iv) the surface was smooth and crack pattern peculiar to the hydrophilic coating was observed.The outer diameter of the main body was measured at the normal section and confirmed to meet the control standards.Magnifying inspection obtained the following results: i) both edges of both fragments had been elongated.Ii) both fragments were in tube shape and no break was observed in the lengthwise direction.Iii) the middle part of fragment 1 had been deformed.Iv) the outer surfaces of both fragments were non-glossy.Electron microscopic inspection obtained the following results: i) both edges of both fragments seemed to have been pulled and torn.Iii) no scratches were observed on the deformed part of fragment 1.Iv) the outer surfaces of both fragments were rough.V) for both fragments, the surface condition was different between the outer and inner surfaces.Both fragments were cut lengthwise to inspect the inner surface.Electron microscopic inspection of both fragment obtained the following results: i) the inner surface of both fragments were found smooth with a crack pattern on it, which was similar to the outer surface of the guidewire.Ii) multiple creases were observed near the edges of the fragments.Iii) the deformity on fragment 1 was confirmed to be some dents that had occurred from the inner to the outer side.This was like the area approximately 1040 millimeters from the distal end of the main body.Both fragments were subjected to the component analysis by ft-ir and found to have the same ir-spectrum as the outer layer of the guidewire.From this, it was inferred that fragment 1 and 2 were the outer layer that had peeled from the guidewire.Based on the investigation results results on the fragments cut lengthwise to inspect the inner surface and the ft-ir analysis, fragments 1 and 2, fragment 1 and 2 were those peeled from the actual sample and turned inside out.Based on the condition of the actual samples with some dents and lengthwise abrasions on the surface, it was presumed that some hard object may have been put against the guidewire with force and moved over the surface.From our past findings, it is known that the outer layer of the guidewire may be torn off and turned up when excessive torque and push/pull operations are performed with the torque device tightened.From the simulation test results, it was presumed that the outer layer might have been flawed and turned up due to excessive manipulation with the torque device in strong contact.Afterward, when the torque device was detached, the turned up outer layer was torn and separated from the main body.Ashitaka factory is committed to assure the quality of this product by implementing thorough work and inspections, including the followings.I) 100% visual inspection is performed to confirm that there is no turned up part in the outer layer.Ii) the guidewire goes through the dedicated inspection jigs to confirm that there is no turned up part in the outer layer.The following caution is indicated in the ifu of this product: "do not slip a tightened-up torque device over the wire, as this may result in damage to the wire." terumo medical products (tmp) (importer) registration no.(b)(4) is submitting this report on behalf of ashitaka factory of terumo corporation (manufacturer) registration no.(b)(4).
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