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Manufacturing site: (b)(4).The reported sion blue guide wire was returned for evaluation.Detachment of the tip was confirmed on the returned guide wire.The fractured spring coil was elongated for approximately 9mm distal to the distal-mid solder that was originally set at 20mm from the tip.The core, composed of a twist wire and a taper core wire, was fractured at approximately 15mm distal to the solder.Each fracture end was microscopically observed.Due to excessively applied torsion, two core-composing wires were intertwined with each other proximal to their fracture ends.Tightening of strands of the twist wire was observed at the fracture end.The taper core wire was twisted proximal to its fracture end.The taper core wire had a flat fracture surface.These findings indicated that torsion had most likely caused the fracture.Necking was observed on the fracture end of the spring coil, indicating that tensile stress had contributed to coil fracture.Lot history review revealed no anomaly relating to the reported event.No other similar product experience report was received from this lot.Based on the provided information and investigation outcome, it was presumed that torsion generated with wire manipulation in attempts to cross the lesion had most likely contributed to the observed separation of the core of the returned guide wire.The applied stress would localize and therefore exceed the product design limit when the tip was being caught and restricted its movement by the lesion, leading the core to wrench off.Further applied tensile stress generated with removal then made the coil to fracture so as to detach the tip from the rest of the guide wire.It was concluded that this event was not attributed to product quality.No capa will be taken.Instructions for use (ifu) states: [warnings].Observe movement of this guide wire in the vessels.Before this guide wire is moved or torqued, the tip movement should be examined and monitored under fluoroscopy.Do not move or torque the guide wire without observing corresponding movement of the tip; otherwise, the guide wire may be damaged and/or trauma may occur.In addition, ensure that the distal tip of this guide wire and its location in the vessel are visible during manipulations of the guide wire.Never push, auger, withdraw, or torque this guide wire that meets resistance.Torquing or pushing this guide wire against resistance may cause damage and/or tip separation of this guide wire or direct damage to a vessel.Resistance may be felt and/or observed under fluoroscopy by noting any buckling of the guide wire.If the prolapse of the guide wire tip is observed, do not allow the tip to remain in a prolapsed position; otherwise damage to the guide wire may occur.Determine the cause of resistance under fluoroscopy and take any necessary remedial action.If resistance is felt due to spasm, bending of the guide wire, or due to trap while operating this guide wire in the blood vessel or removing it, do not torque and/or pull the guide wire itself.Stop the procedure.Determine the cause of resistance under fluoroscopy and take appropriate remedial action.If the guide wire is moved excessively, it may break or become damaged, which may cause blood vessel injury or result in fragments being left inside the vessel.When torquing this guide wire inside the blood vessel, do not torque continuously in the same direction.This may cause the guide wire to become damaged or break apart, causing injury to the blood vessel or leaving fragments inside the vessel.When torquing the guide wire, rotate it clockwise and counterclockwise alternately.Do not exceed two rotations (720 degrees) in the same direction.[malfunction and adverse effects] separation of the guide wire.
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