(b)(4).Method: after submission of the initial report, the customer indicated that the complaint 900mr810 adult heated wall reusable breathing circuit was discarded following the event and was not available to be returned to fisher & paykel healtchare (f&p) in new zealand for evaluation.Our investigation is thus based upon the event description and photographs provided by the customer, as well as our knowledge of the product.The customer indicated that the device was resting on the patient's pillow , but did not answer whether the 900mr810 tubing was covered at the time of the reported incident.It was also reported that the 900mr810 circuit was used for an average of six hours per day, and that the respiratory therapist had frequently observed the breathing circuit resting on the patient's pillow.Results: visual inspection of the photographs provided showed burn marks on a pillow, and the configuration of a breathing circuit with respect to the burn marks.The circuit shown in the configuration photograph did not show any signs of damage, deformation, or melting.No information was provided as to whether the circuit shown in the photograph was the complaint breathing circuit or a sample used for illustrative purposes.Conclusion: without the complaint 900mr810 adult heated wall reusable breathing circuit or a photograph showing the reported damages, we are unable to determine what may have caused the reported event.All 900mr810 adult heated wall reusable breathing circuits are visually inspected and pressure tested prior to being released for distribution.Any circuits that fail these tests are rejected.This complaint 900mr810 adult heated wall reusable breathing circuit met the required specifications at the time of production.The user instructions that accompany the 900mr810 adult heated wall reusable breathing circuit 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." "disconnect tube by handling end connectors only, do not pull or twist tubing, as this may cause damage." "do not use the heated breathing circuit without gas flow.If gas flow is interrupted turn the humidifier off." "do not cover the circuit with materials such as blankets, towels or bed linen.".
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