Date of event: unknown.The date received by manufacturer has been used for this field.Investigation summary: exec summary: no physical device samples were returned.The investigation was performed based primarily on the image(s) provided.It was reported the plunger is sticking.To aid in the investigation, two disassembled empty samples with no packaging blister or tip cap were received for evaluation by our quality team.A visual inspection was performed and no defects or imperfections were observed.Each sample was then tested for sustaining force, which is the force applied to the plunger rod while moving downwards when expelling the saline solution, and all results were within specification.It could be possible the customer is getting some products that are towards the high specification limit and are related to the symptom reported by the customer since they require extra force than normal to expel the solution.Previous investigations have revealed that improper silicone application within the syringe barrel can create plunger resistance.Several quality initiatives have been implemented on our manufacturing line to ensure that the silicone application is properly applied during the manufacturing process.Additionally, a monitoring program is also in place to verify the silicone is uniformly applied to the syringe barrel.Based on the investigation and with the sample analysis the symptom reported by the customer could not be confirmed and the root cause could not be determined.A review of the complaint lot history check was performed and this is the 4th related complaint for plunger movement difficult on lot # 2021612.No non-conformance's were raised in association with this type of event for this lot, concluding all inspections were performed as per the applicable operations and met qc specifications.Capa/sa: based on the above no additional investigation and no corrective or preventative action (capa) or situational analysis (sa) are required at this time.Dhr review: a lot history review for batch 2021612 was carried out and no related non conformance's were raised in association with this packaged lot concluding all inspections were performed as per the applicable operations and met qc specifications.
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