Manufacturer's investigation conclusion: the reported event of a no external power alarm and the mobile power unit (mpu) not powering on was confirmed via the submitted log files and reproduced.A review of the controller event log files spanned approximately 5 days ((b)(6) 2023, and (b)(6) 2023 per time stamp).On (b)(6) 2023 at 03:41:33 while connected to the mpu, the no external power alarm activated while connected to the mpu due to both white and black lead voltages diminishing to 0v.This was consistent with a loss of ac power.The no external power alarm cleared a minute later after switching to batteries.The alarm did not affect the controller's ability to operate the pump at the set speed.There were no other notable alarms active in the log file.During the evaluation of the returned mpu, serial (b)(6), the reported event was confirmed.The unit was plugged into an ac power source and the unit did not power on.The issue was isolated to the power supply pcb which was replaced.A functional test was performed, and all tests passed.The unit was returned to the customer site and is ready for use.Visual inspection of the power supply pcb revealed no anomalies.The pcb was plugged into a test unit and there was no voltage output coming out of the secondary side of transformer t1.Due to the voltage drop, the board did not output the 15vdc required to power the main pcb.Additional information provided indicated that the alarms activated after the patient had tripped on his mpu cord.Once the controller was exchanged, the alarm condition resolved.Per the additional information, the root cause of the reported no external power alarm was due to disconnecting the ac power cord from the wall.The root cause for the mpu not powering on was determined to be a damaged transformer in the power supply pcb; however, a root cause for this damage could not be conclusively determined through this analysis.Device history records were reviewed and showed no deviations from manufacturing or qa specifications.The patient handbook cautions the users to call their hospital contacts if they think, for any reason, any portion of their equipment is not functioning as usual, is broken, or they are uncomfortable with the operation of the equipment.Heartmate 3 patient handbook section 5, entitled ¿alarms and troubleshooting¿, and heartmate 3 instructions for use section 7, entitled ¿alarms and troubleshooting¿, cover all alarms (visual and audible), including the controller fault and no external power alarms, and the actions to take if the alarms cannot be resolved.Heartmate 3 patient handbook section 6 ¿caring for the equipment¿ and heartmate 3 instructions for use (ifu) section 8 ¿equipment storage and care¿ explain how to care for and clean all equipment, including the mpu.Heartmate 3 patient handbook (rev.D) section 10 ¿safety checklists¿ and heartmate 3 instructions for use (ifu) section e ¿safety checklists¿ provide the user with checklists to assist the patient in performing routine maintenance of all components of the heartmate 3 left ventricular assist device, including the mpu.Heartmate 3 instructions for use section 8-¿equipment storage and care¿ and heartmate 3 patient handbook section 6-¿caring for the equipment¿ explain how to properly handle the equipment to prevent damage.No further information was provided.The manufacturer is closing the file on this event.
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