Investigation summary: it was reported that plungers on the syringes stop about half way.To aid in the investigation, four used sample 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 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 1056479.The review did not reveal any detected quality issues during the production of this lot that could have contributed to the reported defect.Investigation conclusion: based on the investigation and with the returned 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.Root cause description: probable root cause.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.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.Rationale: capa not required at this time.
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