(b)(4).Method: the subject mr290v vented auto feed humidification chamber was not returned to fisher & paykel healthcare for evaluation, therefore, our investigation is based off the photographs provided by the healthcare facility and our knowledge of the product.Results: visual inspection of the photographs provided confirmed a vertical crack near the base of the chamber dome.Brown residue was also visible on the base of the dome.Conclusion: the subject device was requested to be returned for investigation, however, it was not provided and we are therefore, unable to determine the cause of the leak.Our user instructions that accompany the mr290v vented auto feed humidification chamber state the following: "do not soak, wash, sterilize, or reuse this product.Avoid contact with chemicals, cleaning agents, or hand sanitizers." "perform a pressure and leak test on the breathing system and check for occlusions before connecting to a patient." "ensure appropriate ventilator and flow source alarms are set before connecting breathing set to patient." "use of the mr290 above the maximum operating pressure may lead to cracking, water leakage and, on rare occasions could lead to a loss of ventilation pressure." "do not use the chamber if the seals are not intact when received, or if it has been dropped.".
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