The thoracic gearshift, item # (b)(4), lot # 668540, was returned for evaluation.Visual inspection of the item shows the tip of the probe has fractured off.The fractured tip was not returned with the item.Hardness testing was performed and the results were within specification.The dhr (device history record) was reviewed and no non-conformances are noted.There are no indications of manufacturing issues which would have contributed to this event.The results concluded excessive bending load resulted in the tip fracturing around 35mm mark at transition from circular to rectangular cross section.This is expected area of failure due to transition and resulting stress concentration.The root cause cannot be conclusively determined, but a bending force on the instrument may be a contributing factor.
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