This mdr was generated under protocol (b)(4), as a result of warning letter cms# (b)(4).An invalid lot number was provided; therefore, device history record review could not be completed.A product sample was received for evaluation.Visual and functional testing were performed.One (1) sample was received without its original packaging inside a ziploc bag.Sample was in used conditions.Visual inspection was performed at 12 under normal lighting to received units, in order to detect any damage on the cuff or airline.During the visual inspection, it was found exposed wire on the shaft.The sample was tested on leak test.The test was performed under water as per procedures.In order to see if the unit had a hole.The unit was inflated and it was visually inspected for 10 seconds, it was not observed any leakage and it was seen well inflated.Then the unit was submerged under water, it was not observed any leakage.It was followed to massage the product, the balloon was squeezed and the airway line was moved back and forth, no leakage was detected.Additional in attempt to reproduce the failure mode a sample was taken from scrap process and the dremel was used on the surface of the tube to remove the silicon excess.During the test, it was observed that if the dremel was not used properly the surface of the tube could be damaged and the exposed wire could appeared in a similar way to the sample received, which was the root cause of the reported event.Production personnel reviews the parts 100% before assembling and after assembling them to see if they any exposed wire.Quality takes a representative sample and performs a visual inspection reviewing for wire at shaft after process.Qalert was generated in order to ensure that operators could be able to see how to inspect the tubes to detect exposed wire.Create visual aid to show the correct procedure to position /adhesive shaft into neckstrap and how to use the dremel.Changed was initiated.Updated to reference the visual aid.Changed was initiated.As a preventive action production personnel was notified by area trainer as awareness of the defect reported by the customer.
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