Investigation: the investigation was carried out visually and microscopically with a keyence vhx-5000 digital microscope and a panasonic dmc tz8 digital camera.We made a visual inspection of the instrument.Here we found and unknown etching.Additionally we detected a broken off tip and a quirk with a groove.Furthermore we made a visual inspection of the fracture surface.Here we found brown discoloration and unknown impurities.Batch history review: the device quality and manufacturing history records have been checked for the lot number and found to be according to the specificaiton, valid at the time of production.No similar incidents have been filed with products from this batch.Conclusion and root cause: the root cause fo the problem is most probably usage related.Rationale: according to the quality standard and dhr files, a material defect or production error can be excluded.No pores could be found on the point of rupture.There is the possibility of pre-damage or similar due to previous surgeries.Investigations lead to the assumption that the breakage and quirk with the groove were caused by an improper handling due to a mechanical overload situation.There is the possibility of high leverage with the instrument.We assume that the discoloration is unknown residues.No capa is necessary.Additional data: added.
|