After evaluation of device, it was determined that the retractor had been damaged by the user.When looking at the fiber surface under magnification, several impact marks and lines can be seen, which suggests that some sort of impact took place.The metal surrounding the fiberoptics has mushroomed slightly.Once damaged, the heat was no longer able to dissipate as designed and the temperature would have risen at the location of the damage.This increased temperature then caused the fiber surface to burn, thus leading to a more substantial failure: in this case, a piece of fiberoptic bundle came off.Based on this evaluation, it can be determined that the failure could not have happened while in contact with the patient, rather possibly during reprocessing or at the time of impact.
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