(b)(4).The device was returned to the factory for evaluation.A visual inspection was conducted.Signs of clinical use with evidence of blood were observed.Traces of blood were evident on the tool handle and on the jaws.Charred tissues were also evident on the jaws.On microscopic inspection, the heater wire was observed to be bent and detached at the tip, but remained attached at the base.The silicone insulation on both cold and hot jaws were intact with no cracks nor peeling.A pre-cautery test was performed per the instruction for use (ifu) with a reference cable, adapter and reference power supply at level 3.0.During the pre-cautery test, it produced steam and audible beeping sound during five (5) 3-second activations.To evaluate the safety shut down system, a poly-fuse activation test was performed 5 times over 10 minutes.The device shut off after the period of sustained activation and reactivated after a 10-second cooling period with no incident each time.The jaws were cleaned gently with saline and gauze pad as indicated in the instructions for use.An activation and transection capability test were performed over five (5) repetitions using "max life test method" (bacon test).The device activated and transected tissue six (6) times with no cautery failure observed.A temperature and resistance evaluation was conducted to evaluate the device function.The resistance value was measured at 0.683 ohms which is within hemopro 2 final test specification.The device passed the temperature measurement test.The displayed temperature increased and turned ¿green¿ within the 2 second specified timeframe.The displayed temperature decreased once the toggle switch was released.Based on the returned condition of the device and the results of the investigation, the reported failure mode "failure to cut" was not confirmed.The analyzed failure mode "bent wire" was confirmed.Specific actions for the analyzed failure mode "bent wire" are being maintained and documented under maquet¿s failure investigation report (fir) system.
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