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The account reported a discolored cylinder and several reports of these cylinders not working correctly due to what the associates think is a check valve issue.A photo was received for investigation; upon visual review, no issues were identified, and since the reported problem is functional in nature, a physical sample is required for further evaluation.Based on the complaint details, picture evaluation, and investigation, the complaint cannot be confirmed at this time.Cause is unconfirmed; sample required to determine cause, and the division will continue to monitor the issue for trending.There were no reports of death, serious injury, medical intervention, or follow up care.It has been determined that the reported event could cause or contribute to serious injury if it were to occur again.In an abundance of caution, this is a reportable event.If additional information becomes available this report will be reopened and reevaluated.This medical device report (mdr) is being submitted as part of retrospective review activities, which include review of historical data in accordance with regulations at 21 cfr part 803.The information included in this mdr reflects the information reasonably known to the manufacturer at the time of this retrospective review and submission.
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