(b)(4).Method: the subject 900mr810 adult heated wall reusable breathing circuit was not returned to f&p for evaluation.Our investigation is based on the photographs and description of events provided by the customer, previous investigations of similar complaints and our knowledge of the product.Results: visual inspection of the provided photograph revealed that the breathing circuit film was melted and had a stretched helix.Conclusion: without the return of the complaint device, we are unable to determine the cause of the reported malfunction.All 900mr810 adult heated wall reusable breathing circuits are visually inspected and tested prior to being released for distribution.Any circuits that fail are rejected.This suggests the reported damage occurred after the subject breathing circuit was released for distribution.The user instructions that accompany the 900mr810 adult heated wall reusable breathing circuits state the following: -"inspect circuit before re-use, do not use if the circuit shows signs of deterioration, such as: cracks, tears, or damage." -"perform a pressure and leak test on the breathing system, and check for occlusions, before connecting to a patient." -"do not cover the circuit with materials such as blankets, towels or bed linen." -"disconnect tube by handling end connectrs only, do not pull or twist tubing, as this may cause damage.".
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