Patient information was not provided.Livanova (b)(4) manufactures the centrifugal pump 5.The incident occurred in (b)(6).A livanova field service representative was dispatched to the facility to investigate.The service representative was not able to confirm the reported issue.During follow-up communication with the perfusionist, the service representative was informed that the customer believes a clot formed in the oxygenator, causing the reported issue.A complete functional verification was completed without issues and the unit was returned to service.If any additional information pertinent to the reported event is received, it will be provided in a supplemental report.Device not returned.
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