(b)(4).Method: the complaint opt846e nasal cannula was not returned to fisher & paykel healthcare (b)(4) for evaluation.Our investigation is based on the visual inspection of a photograph of the complaint cannula, showing the damage.Result: visual inspection of the provided photograph revealed that the soft silicone part on the left side of the nasal interface had been torn apart.The complaint cannula appeared soiled and well used.Conclusion: the cannula would not have passed testing on the production line in a damaged condition.Previous investigations into this type of damage have shown that the most likely cause is overtightening of the headstrap while adjusting it.An excessive amount of force would be required to tear the interface.All optiflow interfaces are inspected during production for visual defects including cracks, tears, inclusions, discoloration and stretching or deformation.Any product that fails the visual inspection is disposed of.The user instructions which accompany the optiflow cannula contain the following warning: - do not crush or stretch tube.The user instructions also show in pictorial format the correct placement and fitting of the cannula.
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