Batch review performed on (b)(6) 2015.Lot 146188: (b)(6) stems manufactured and released on (b)(6) 2015.No anomalies found related to the problem.To date, 18 items of the lot have been already sold without any similar issue reported.Preliminary analysis made by the responsible of the packaging department on (b)(6) 2015 based on a picture of the foreign matter: nothing can be said: dimensions and material not clear from the picture and we cannot know if it comes from our process.On (b)(6) the further analysis was made: we received an object similar to a residue of a burned plastic part.During investigation the responsible of packaging dept, reported: the operator during packaging steps did not detect any anomaly.He performed the controls required in the control instruction (visual inspection).The material received is not compatible with the materials available in clean room (included clothing), it is not possible determine the origin of the return material.The possible root cause of the event are: the object was not detected during the control by the operator; the object accidentally fell out in the packaging during the opening of the packaging.This kind of event is rare.
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