Evaluation results: one blue line classic tracheostomy tube was returned for investigation.The returned sample was visually inspected, at a distance of 12" to 16" and normal conditions of illumination.The inspection revealed that the suction line was detached from the flange.In addition, the pilot balloon was cut from the inflation line.The most probable cause was that the manufacturing operator applied methylene chloride instead of tetrahydrofuran (thf), due to the fact that the dispensers were similar.
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