Multiple lot numbers: there were multiple lot numbers reported to be involved.The information for each lot number is as follows: medical device lot #: 1056479.Medical device expiration date: 2024-02-29.Device manufacture date: 2021-02-25.Medical device lot #: unknown.Medical device expiration date: unknown.Device manufacture date: unknown.Investigation summary: it was reported that plungers on the syringes stop about half way.To aid in the investigation, three used samples with no packaging flow wrap 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 that parts that are towards the high specification limit 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 1056479.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 returned sample analysis the symptom reported by the customer is 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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