Investigation completed on a smiths medical syringe infusion pumps|medfusion 4000 pumps.The complaint of force sensor error was verified and validated in event log and during testing.The physical condition of device revealed the bottom case contaminated by the "l" bracket and damaged and missing seal (lining) on bottom case.Cracked and damaged right plunger case and cracked battery door.Upon visual inspection the device revealed contamination.Upon power up testing the device revealed, steady state reading of the force sensor (with no pressure on it) count 0 and - 1.13 lbs.The cause is believed to be customer induced from damage and contamination.Action was taken to replaced right and left plunger cases and recalibrated.Device passed all functional testing.Other repairs to damage and routine maintenance included: replaced right and left plunger cases and recalibrated.Power up, re-calibrated force sensor and device passed all the functional test.
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