Device evaluation: one device was returned for investigation.Visual inspection noted no physical damage.Functional testing confirmed the complaint.The "peep" reading is low at max but high pressure is alarming.Root cause was attributed to the variable relief valve.The device has a history of impact damage.Cause of damage to the variable relief valve could not be determined.The product's history records were reviewed and there were no non-conformances nor service-related issues that would have resulted in the reported complaint.Replaced variable relief valve, mri battery, sintered filter, o rings and instruction label for the preventative maintenance (pm).Reset patient pressure cycling led.Performed pm, recalibrated unit, cleaned and affixed new service label.Device passed all functional testing after the completed repairs.
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