Investigation summary: it was reported after the initial push of fluid, the plunger becomes very difficult if not impossible to press.To aid in the investigation, one photo was provided for evaluation by our quality team.The photo shows four syringes with no tip cap and the solution partially expelled.No defects or imperfections are observed.It could be possible that 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.A device history record review was completed for provided material number 306546, lot number 1056481.The review did not reveal any detected quality issues during the production of this lot that could have contributed to the reported defect.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 photo sample analysis the symptom reported by the customer could not be confirmed.Complaints received for this device and reported condition will continue to be tracked and trended.Our quality team regularly reviews the collected data for identification of emerging trends.
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