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The user facility reported that they had performed a percutaneous coronary intervention (pci) with pre-dilitation ballooning and stenting of both an om2 and mid-circumflex.It went successfully and they re-positioned the runthough wire into other vessels left anterior descending artery (lad) and diag and performed ballooning and stenting to the other vessels, also successfully and uneventfully.They then saw a flow defect in the ostial/prox om2 stented area.They turned their attention back to the om2 and re-wired the circ and om2 which was the stented portion.They passed a 2.5 x 6 balloon in an attempt to balloon the defect; however, the balloon would not advance to the lesion.At that time the wire could not be removed.During the attempt to remove the wire the distal tip of the runthough wire broke off.It did not seem to migrate, and the flow did not seem disrupted.An attempt was made to pass a stent down to trap the wire in place however, that was unsuccessful.They ended the procedure at that time.The patient was in good condition.There was no blood loss.Additional information was received on 16jul2025: no other terumo products were used in combination with the wire.The fragment of the wire was left inside the patient and it has not been removed.
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This report is being sent as follow-up no.1 to update section d9, section h3, and to provide the completed investigation results.The actual device has been returned for evaluation.Visual and microscopic inspections: - the actual device upon receipt was a runthrough ns.- the niti-core wire and platinum coil at the distal end had been fractured.- the length of niti-core wire (from the fractured section to the joint of the stainless- steel coil and platinum coil, and niti core wire): approximately 21mm - since the length of niti-core wire inside the platinum coil section of the product with the involved product code is approximately 30mm, it was likely to be missing approximately 9mm.Regarding the missing length of platinum coil, it was elongated and could not be determined.- the coil had been elongated (the coil pitch had been opened) near the joint of the stainless- steel coil and platinum coil, and niti core wire.- no anomaly was found in other sections.Electron microscopic inspection of the fractured section at the niti-core wire - the wire had been tapered.- the wire had been diagonally.- dimple patterns (hole-shaped patterns seen during fatigue failure) were found on the top surface at the fractured section.Confirmation of dimensions - it met the factory's specifications.No anomaly was found.History investigation of the product with the involved product code/lot number - no anomaly was found in the manufacturing record and the shipping inspection record.- no other similar report was found in the past.Simulation test: [fracture due to the pulling force] made the distal end of coil getting stuck, pulling force was applied.As a result, the niti-core wire was fractured, and then the coil was elongated and fractured.The fractured section of the niti-core wire had the following characteristics.- the wire was tapered.- the wire was diagonally.- dimple patterns (hole-shaped patterns seen during fatigue failure) were found on the top surface at the fractured section.(cause of occurrence): based on the investigation result, no anomaly was found in the manufacturing history records and the dimensions at the normal sections.Based on the condition of actual device and the simulation test result, as a possible cause of this case, it was likely that the distal end got stuck and pulling force was applied for some factor, causing the niti-core wire to fracture, and then the platinum coil elongated and fractured.However, since the details of procedure were unknown, it was not possible to clarify the cause of stuck.(countermeasure) ashitaka factory has been making efforts in maintaining the quality of the product by performing following controls.- after the product assembling process, 100% visual inspection is performed to confirm that there is no deformation in the coil.- after the product assembling process, the outer diameter is measured on 100% basis to confirm that there is no anomaly in it.- in the manufacturing process, 100% pulling test is performed to confirm that there is no anomaly in the pulling strength.- in the shipping inspection, pulling strength is measured on sampling basis for each product code/lot# to confirm that there is no anomaly in it.The ifu of this product includes the following warning.: - if any resistance to the runthrough ns or the dilatation catheter is felt during manipulation or if the shape, behaviour or position of the guide wire's tip seems improper, e.G., in a case where the tip is trapped due to vessel spasm or some other cause or the tip is folded as shown in fig.2, stop manipulating the guide wire (and the catheter) and determine the cause carefully by fluoroscopy and take suitable remedial actions.Then remove the guide wire slowly, without turning, to exchange it for a new one.Continuing guide wire or catheter manipulation in the said situations may result in damage to the vessel, damage to or separation of the guide wire's tip, and/or damage to the dilatation catheter.(b)(4) (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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