Integra completed its internal investigation (b)(6) 2015.The investigation included: method: dhr review.Complaint trend.Visual inspection.Results: device history record reviewed for 1-11574 manufactured on 08/06/2013 show no abnormalities related to reported incident found.This device passed all required inspection points with no associated mrr¿s, variances or rework.No previous service history on file.A two year look back for the reported failure and or related to "on/off switch is not working, it is stuck on the on position" for this product id shows that (b)(4) complaints were received including this case.No new design or manufacturing trends have been identified.Received hand piece only without a guard, no width clips or tools included with return.Head calibration is in tolerance on all points except knob tension-low, common with over use.Head also has grooved eccentric screws and minor nicks on the gauge bar both common wear.Corrosion found on all internal assemblies starting at the bottom of the motor casting down to the end cap including motor assembly.Switch does not function, and switch boot is torn from use.Reason for return confirmed, switch does not function.Also motor is corroded, the part passed amp test but future problems likely.Switch failure likely due to corrosion or moisture damage to the spring.Corrosion from moisture found inside the hand piece and could also have entered the switch through the cracked switch boot.Conclusion: the end users reason for return was verified.The most likely reason could be due to the corrosion found on all of the internal assemblies.
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