(b)(4).Further information was received from the hospital stating that no leak test was conducted on the subject bc161-10 bubble cpap system prior to patient use.Additionally, the customer stated that after the reported incident, the pressure manifold of the subject bubble cpap system was manipulated by the caregiver, thus the returned pressure manifold will not be in its original state.Method: the complaint bc161-10 bubble cpap system, including the inspiratory limb, expiratory limb, mr290 autofeed humidification chamber and pressure manifold, were returned to fisher & paykel healthcare in (b)(4) for evaluation.The components of the complaint bubble cpap system were visually inspected.The complaint pressure manifold was functionally tested in its returned state.The manifold cap of the pressure manifold was then adjusted to its preset flow rate and functionally tested.Results: no damage was found to the inspiratory limb, expiratory limb and mr290 chamber upon visual inspection.The pressure manifold's shroud clips were found to be broken and had evidence of manipulation by the customer.Functional testing of the complaint pressure manifold confirmed that it was out of specification.After adjustment of the pressure manifold to its preset flow rate, it was found to be within specification.Conclusion: we were unable to conclude what caused the failure as reported by the customer as the returned pressure manifold had been manipulated by the customer.All pressure relief manifolds are pressure tested prior to being released for distribution.Any manifolds that fail are rejected.This suggests that the subject pressure relief manifold was damaged after it was released for distribution.The user instructions that accompany the bc161 bubble cpap circuit kit state the following: - ensure that any unused ports have their caps and/or plugs in place before use.- test circuit for occlusions and pressure leaks using the flow elbow provided before connection to the infant." the user instructions additionally instruct the user to test the circuit for occlusions and pressure leaks before connecting the system to the infant.
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