This event has been recorded by zimmer biomet under (b)(4).It was reported that the pressure was at 300 mmhg and the blood was still squirting through.They then adjusted the pressure to 350 mmhg, which they felt should cut off the blood flow; however, the blood continued to squirt through in a pulsating manner.The tourniquet screen was not locked up during the case.The customer returned an a.T.S.4000 tourniquet device for evaluation.The device history record (dhr) review noted no related non-conformances, requests for deviation (rfd), change notices (cn) or any other issues with manufacturing.The dhr review found no issues with the device and all verifications, inspections and tests were successfully completed.Initial qa inspection of the a.T.S.4000 tourniquet on february 1, 2018 revealed that the device operated as intended.The device passed all testing and calibration with no findings.The device needed the software upgraded to the newest revision.Repair of the a.T.S.4000 tourniquet was performed by zimmer biomet surgical on february 1, 2018 which included upgrading the software to the latest revision.A.T.S.4000 tourniquet was then tested and functioned properly.It was repaired, inspected and tested per (b)(4).The reported event was non-verifiable since during the initial inspection it was noted that the device operated as intended.The root cause of the reported event could not be specifically determined with the information that was provided.During the initial inspection it was noted that the device operated as intended.The investigation was based on the information that was provided initially and any information that was obtained throughout the follow-up process.
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