H3, h6: the navio, handpiece, part number 110137, sn: (b)(6); intended for use is treatment was returned for evaluation.The reported problem was visually confirmed.The leadscrew nut is broken.Although the reported problem was visually confirmed, a functional evaluation could not be performed due to the broken lead screw nut.A review of manufacturing and service records indicate the device met all specifications upon release into distribution.A complaint history review for similar reported/confirmed complaints has identified prior events.The most likely cause of this event is mechanical failure of the leadscrew nut.As a part of corrective action, a more robust design of the snap lock has been released.
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