Oncology patient getting chemo infusion through circle primed tubing with blue ball that normally drops and prevents air from entering tubing.Ball dropped but pump did not beep off occluded as it does normally and instead drew air into the tubing that did not reach the pump before this nurse noticed.Most likely the pump would have alarmed air in line if very large air bubble had gotten to that part, but it might not have and could have caused air embolism and resulted in patient harm make it policy again to under dial volume to safeguard from incidents if this equipment malfunctions again.Also evaluate why this is happening with the tubing, as it is supposed to be prevented by the blue ball.Summary of biomed check of device work completed: "found unit in the clean utility room ready for use.Checked unit's condition, failed rate accuracy, preformed rate accuracy calibration and repeated unit verification.All tests passed." there was no harm involved, this was an "unplanned barrier catch".
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