Product evaluation: failure analysis for fiber (b)(4): the fiber cap exhibits drilled through condition; there is some white unknown substance noted inside the distal end of fiber cap; the glass cap exhibits devitrification at the output area, and detritus adhesion around output area; the heat shrink tubing exhibits minor scratch marks; the fiber was tested with hene laser fixture, the aim beam is present at the fiber tip; there are no signs of breakage along length of fiber.Based on device analysis, the potential for forward firing may exist.Probable root cause: based on the device analysis, the probable root cause of the failure is: heat accumulation.Cap wear was accelerated due to anatomical/procedural factors (tissue contact and technique) encountered during the procedure which would limit the performance of the fiber.
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