(b)(4).Results of investigation: the carefusion failure analysis laboratory received the suspect device, a sipap unit, and evaluated the device.An evaluation of the device found that material from the blender assembly entered into the high pressure flow meter tube, causing the float to intermittently stick, then dislodge causing a spike of pressure.The pressure increase did not rise over the set alarm limits so no audible or visual alarm was expected.The unit was due for the 5 year preventative maintenance and blender overhaul, so the lack of maintenance has been determined to be the cause of the reported issue.Carefusion factory service repaired the device and the unit meets factory service specifications.
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