Investigation summary: ten samples were received for evaluation by one of our quality engineers.They were with the sealed packaging flow wrap.They had the plunger rod-rubber stopper, the tip cap and saline solution.The barrel labels confirm the lot# 7026895.The ten samples were tested for sustaining force.Eight (8) of them passed, having 9.60n the lowest reading and 15.60n the highest reading.The two that failed, one had 21.40n and the other 23,50n.The spec is<20n therefore failure mode is verified.Root cause could not be determined.A device history review was completed and there was no issues with plunger movement difficult during production run for batch 7026895.There were no quality notifications issued during the production of this batch listed in the complaint.Investigation conclusion: root cause could not be determined.There were no qns issued during the production of this batch listed in the complaint.There were no issues documented about plunger movement difficult.
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