This initial report was identified as a late submission during a two year retrospective review of complaints and mdr¿s following receipt of an untitled letter issued by the fda.(b)(4).A carefusion field service representative visited the user facility to evaluate the device.During the course of the evaluation the field service representative noted: customer reported oscillator overheated and stopped.Circuit was still attached and settings preserved.They were 3 hz, % it 35.And power set at 10.Inspection revealed that driver diaphragm had a large tear and was very degraded.Performed 8k preventative maintenance, patient circuit calibration @ 40 cmh2o, and performance test @ 26.7 cmh2o paw/131 cmh2o amplitude.Replacement driver assy returned to failure analysis lab for additional evaluation, the evaluation is not yet available.
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