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Results of investigation: product was received on november the 26th 2021.A visual inspection is done as receipt.The breakage of the ao tip is confirmed (at the level of the color dot).The broken part has not been returned.The laser markings are almost not readable.However, the lot number of the returned drill is f5nl.Per consequence, a dhr review is done again with the correct lot number.P/n 519005nd lot f5nl was manufactured in june 2013.(b)(6) parts were initially released.No anomaly relative to the issue is observed.A sampling of (b)(6) units were checked at incoming inspection and no anomaly was reported.External diameter, total length, quick coupling dimensions, raw material and heat treatment certificates are in compliance within specifications.No relevant design change was done since the manufacturing of the lot f5nl about the concerned specifications.Inspection was performed according to inspection work instruction di519_005_01_51-rev.02.Inspection steps on the ao tip cannot be performed as this section was not returned.Total length and color dot cannot be checked as the device is broken at the level of the color dot.External diameter is in compliance with manufacturing specification.The cutting tip is blunt.After review of the traceability data for this lot, 2 items p/n519005nd lot f5nl was shipped to the concerned distributor on (b)(6) 2013.The incident occurred in (b)(6) 2021.This device is labelled as a single use drill.Root cause analysis given the description of the event, the observations during documentation review and the results of the product analysis, the root cause of the breakage is normal wear.No anomaly was found during documentary review including review of manufacturing file, technical specifications and quality records.Trend analysis does not show any recurrence.The analysis of the returned device confirmed the breakage at the level of the ao tip.The degradation of the laser marking, the wear of the cutting blades, in addition to the shipping date to the concerned customer ((b)(6) 2013) allows us to conclude that the single use drill was used multiple times over the years.Regarding investigation results, the concerned risk is correctly evaluated.No action deemed necessary.
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