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Medical device problem code: (b)(4).Investigation results the returned orise proknife was analyzed, and a visual analysis found no problems with the handle, however a kink was observed in the working length.Additionally, the tip of the electrode was observed to be detached.The ceramic tip was removed from the device to observe the location of detached electrode.A functional evaluation noted that no resistance was felt when actuating the thumb slide on the handle, however the electrode did not extend from the tip.No other issues were noted.Based on all available information and the condition of the returned device, it is likely that procedural factors, such as the length of time used, power settings required, handling technique, and/or tissue composition resulted in the electrode detachment.The investigation concluded the most probable root cause is adverse event related to procedure.A review of the device history record (dhr) was performed and confirmed that this device met all material, assembly and performance specifications at the time of release for distribution.A labeling review was performed and, from the information available, this device was used per the instructions for use (ifu) / product label.
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