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This mdr is part of the fda voluntary malfunction summary reporting program.Additional information: lot kbuv manufactured on 08/27/2019.Lot eaymb manufactured on 10/20/2016.Lot fgxm manufactured on 01/09/2017.Visual analysis of lot mdpe: in both devices, the event of jamming could not be confirmed.The knob was found to have been fractured from the handle.According to the rep, higher force was used to unthread the knob from the handle but it was wasn't successful, which led to the knob fracture.Visual analysis of lot fgxm, eaymb, kbuv: the knob was found to have been stuck with the handle internal threads.Higher force was used to unthread the knob from the handle, but it was not successful.Lot mdpe: it is possible that the devices encountered an excessive amount of reverse torque, which could have weakened the threadlocker.This can cause the handle to jam, and later fracture.The cause for the failure mode was determined to be misuse by the user, leading to fracture.Lot fgxm, eaymb, kbuv: according to the device history review, it was observed that the devices have been out in the field for more than 3 years.Factors such as consistent use of the instrument throughout its lifetime may cause fatigue on the devices, leading to the reported failure mode.
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