(b)(4).Method: the two complaint mr290v chambers were returned to fisher & paykel healthcare in new (b)(4) and were visually inspected.Results: visual inspection revealed that for both complaint devices, the chamber dome was cracked.Visual inspection of device 1 revealed that the dome was cracked along the base, starting below the port and ending below the baffle.A second crack was found above the bracket.Residue was observed in several places on the outer surface of the chamber dome.For device 2, visual inspection revealed that the chamber dome was also cracked along the base, starting below the port and ending below the baffle.Residue and flow marks were also observed in several places on the outer surface of the chamber dome.A lot check revealed no other complaints of this nature for lot 150727.Conclusion: the residue found on the chamber domes indicates that the chambers came in contact with a solution containing alcohol which resulted in environmental stress cracking of the chamber domes.Every mr290 chamber is pressure tested following the manufacturing process to check for any leaks present in the chamber dome 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.Our user instructions that accompany the mr290v vented autofeed humidification chamber state the following: do not soak, wash, sterilize, or reuse this product.Avoid contact with chemicals, cleaning agents, or hand sanitizers.Set appropriate ventilator alarms.Perform a pressure and leak test on the breathing system and check for occlusions before connecting to a patient.
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