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Manufacturing site: asahi intecc (b)(4).The sion guidewire, concomitant sion blue guide wire, non-asahi guiding catheter with non-asahi balloon catheter were returned for evaluation.The sion had its coil wire elongated from the proximal solder located at 280mm from the tip.Both the coil wire and the core wire were found fractured and the tip segment was missing.The sion blue was deformed into an alpha shape at approximately 5mm from the tip.No damage other than this deformation was found on the sion blue.The non-asahi balloon catheter was inserted in the non-asahi guiding catheter when those were returned.An undetermined fragment of a coil wire was observed out of the y-connector.Microscopic observation of the sion guide wire revealed that the core wire was fractured at approximately 2mm from the distal end of the inner coil wire.The core fracture end was necked, suggesting tensile stress had contributed to fracture.The fracture end of the coil wire was relatively flat, indicating that torsion generated when the coils were straightened had likely contributed to fracture.Lot history review revealed no anomaly relating to the reported event.No other similar product experience report was received for this lot.Based on the investigation outcome, it was presumed that tensile stress had contributed to the reported wire fracture.The tensile stress was probably generated with attempts made to release the sion guide wire that was being stuck with the concomitant corsair pro catheter likely due to the tortuous and severely calcified lesion.When the applied tensile stress exceeded the product's design limit, it led the wire to become separated.It was concluded that this event was not attributed to product quality.Deformation found on the sion blue guide wire was likely attributed to friction generated possibly due to anatomy.Instructions for use (ifu) states: [warnings] never push, auger, withdraw, or torque a guidewire that meets the resistance.Torquing or pushing a guidewire against resistance may cause guidewire damage and/or guidewire tip separation or direct damage to a vessel.Resistance may be felt and/or observed under fluoroscopy by noting any bucking of the guidewire tip.If guidewire tip prolapse is observed, do not allow the tip to remain in a prolapsed position; otherwise damage to the guidewire may occur.Determine the cause of resistance under fluoroscopy and take any necessary remedial action; [warnings] if resistance is felt between this guide wire and the other interventional devices while operating this guide wire in the blood vessel, avoid applying excessive force.When abnormal resistance is felt, remove the entire system from the patient's body and determine the cause.Otherwise, the guide wire may break or be damaged and may cause injury to the blood vessel or leave fragments inside the vessel; and, [malfunction and adverse effects] separation of the guide wire.
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