One used sample model 2420-0007 lot 23035066 was returned for investigation.The set was examined for defects and abnormalities.No defects or abnormalities were observed.The sample was primed with water and a bd secondary set primed with blue dye water was attached to the needless connector just before the back check valve.The sets were allowed to flow freely using gravity.It was observed that the blue dye water was flowing up the primary set line.The customer complaint that there was back flow was confirmed.A quality notification was sent to the supplier.From the supplier investigation, particulate presence could not be confirmed through visual inspection of the assembled check valve.The check valve was inspected on offline testers and backflow failure was observed.The check valve was disassembled, and particulate was observed on the silicone disc.The particulate was sent to a lab for ftir analysis.The particulate observed between the disc and the sealing surface created a leak path that led to the backflow.Ftir analysis results indicated particulates associated with silicone polymer.This particulate was not generated at the supplier.A notification was sent to the manufacturer.From the manufacturer's investigation, the potential root cause for back flow due to particles in check valve could be related to contamination during the proximal automated machine process generated for the same component.The reported failure mode was addressed under a quality notification: the cleaning of the bowl feeder with vacuum cleaner and alcohol wipes was carried out on (b)(6) 2023.The material of the affected lot was 100% reviewed on (b)(6) 2023.The failure mode will be escalated to the supplier by the sqe team.No further actions are needed.It is difficult to know where in the production process or external processes the check valve became contaminated.A device history record review for model 2420-0007 lot number 23035066 was performed.The search showed that a total of (b)(4) units in 1 lot number was built on 09mar2023.There were no quality notifications issued for the failure mode reported by the customer during the production build of this set.
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