Investigation: the customer did not provide the lot number pertaining to this event,therefore a device history record (dhr) search could not be conducted for this specific incident.All lots must meet acceptance criteria before release.Per the trima accel manual, the masterguard needle protector engages into a locked position only if it is held in place while the apheresis needle is removed by pulling the tubing.It does not engage if the wings of the needle or body of the needle protector are used to remove the needle.After use, visually confirm that the needle protector is locked over the needle and that the wings are securely held behind the locking prongs.Root cause: this disposable was unavailable for specific root cause analysis.Per feedback from the customer¿s director of donor services, this incident is most likely due to an operator training issue.
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