(b)(4).The implant was returned for evaluation.Visual inspection did not confirm the presence of any polyethylene or adhesive on the implant, but did conclude the presence of blue discoloration spots on the surface.The device was used for treatment.No definitive root cause can be determined at this time.This issue has been previously investigated and as part of corrective action, a new supplier for the polyethylene bags has been selected and testing completed to ensure thermal reliability and stability of the new bags.Field action z-0845-2016 was initiated on january 11, 2016 to remove remaining affected units from the field.This field action contains the related part and lot number.This mdr was identified during an internal retrospective review to meet reporting requirements and therefore is being filed retrospectively.
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