(b)(4).The complaint mr290v vented autofeed humidification chamber was not returned to fisher & paykel healthcare for investigation.An attempt was made to obtain additional information from the patient but no response was received.Without the complaint device or additional information from the patient, we would not be able to determine definitively the root cause of the reported fault.Every mr290 chamber is pressure tested following the manufacturing process to check for any leaks present in the chamber due to cracks and other causes.Any chamber which fails this test is rejected.In addition, the pressure test is followed by a visual inspection of each chamber.The subject mr290v chamber would have met the required specification at the time of production.The crack on the chamber dome occurred after seven hours of use suggests that it was initially functioning correctly.The user instructions that accompany the mr290v vented autofeed humificiation chamber state the following: "do not soak, wash, sterilize, or reuse this product.Avoid contact with chemicals, cleaning agents, or hand sanitizers." "use of the mr290 above the maximum operating pressure may lead to cracking, water leakage and, on rare occassions, could lead to a loss of ventilation pressure." "set appropriate ventilator alarm." "perform a pressure and leak test on the breathing system and check for occlusions before connecting to a patient.".
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