We have received the complaint device for evaluation.When the handpiece was connected into a control unit, the indicator light on the control unit flashed orange indicating an issue with the handpiece.We were unable to rotate the drive shaft when either the run or the window lock button was pressed.Upon disassembly, we did not noted any component failure and the adhesive on the pc board appeared to be in properly working condition.The seal housing was observed to have heat discoloration.The likely root cause of this issue is a seized ball bearing.Over time, particulates and water could enter into the ball bearing assembly since it is not a hermetically sealed component.We have already implemented a corrective and preventive action (capa) to resolve this issue by replacing the ball bearings with slip bearings which better prevent the bearings from corrosion and from seizing.This device was manufactured prior to the implementation of these changes.There was no harm to the patient as the result of this incident.The procedure was completed using a different handpiece.
|