Device evaluated by mfr.: the device was returned for evaluation.The advancer, burr, sheath, coil, and handshake connections were microscopically and visually examined.The advancer unit and burr unit were received attached together as a single unit.The advancer knob was received tightened in a backward position.There was blood in the sheath of the device.The sheath was separated/split 25.5cm distal of the strain relief.The ends of the sheath were jagged, twisted and damaged with suggests the separation was due to tensile overload.The sheath was also damaged/flattened 23.5cm ¿ 24cm distal of the strain relief.The damage is consistent with damaged caused by the hemostasis valve being over tightened.The annulus was also damaged, not rounded and flattened on one side.Inspection of the remainder of the device, apart from the observed damage, revealed no other damage or irregularities.No other issues were identified during the product analysis.The manufacturing batch record review confirmed that the device met all material, assembly and performance specifications.The most probable root cause is operational context as device performance was limited due to anatomical procedural factors.(b)(4).
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