(b)(4).Method: the complaint opt544 cannula was received for evaluation at our regional office in brazil and was visually inspected.Our investigation is based on the information and photographs provided by our office.Results: visual inspection of the photographs revealed that the right side of the nasal interface had been pulled apart and was broken at the left headgear connection point.Conclusion: the most likely cause of the observed damage is overtightening of the headstrap while adjusting it.Our user instructions that accompany the opt544 illustrate the procedure for fitting the optiflow nasal cannula to a patient and state the following: - do not crush or stretch tube.The opt544 interface is shipped to the customer fully assembled.The cannula is 100% inspected by production line staff during assembly for visual defects such as cracks, tears, inclusions, discolouration and deformation.If any are found the product is discarded.Evaluated at regional office.
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