The user facility did not involve the local dräger s&s organization into examination of the device and did not provide further information upon request.An in-depth investigation is thus not possible.The following general assessment can be made: the most likely interpretation for "bellows" is the manual breathing bag.The manual breathing bag serves as a volume reservoir in both manual and automatic ventilation modes; it must be actuated/squeezed during manual ventilation to provide breathing gas to the patient.It is plausible that e.G.A cut in the surface leads to loss of pressure and volume and may disturb ventilation.The daily pre-use check includes an automatic test procedure through which the device runs autonomously once the user has started it.Further, there is a manual checklist the user has to go through for those test items that cannot be performed by the device independently.For example, during the test of the apl valve it would be obvious if the breathing bag does not fill as intended due to the leakage.Dräger concludes that the damage of the manual breathing bag must have either occurred after full completion of the entire test procedure or the user has not conducted the manual pre-use check or at least only incompletely.It would also be imaginable that the material of the breathing bag became porous after long-term use.Hence, the reported issue is related to aspects that are beyond the control mechanisms a manufacturer can establish.The device has responded as designed upon such deviation and alarmed the divergence between set and delivered tidal volumes.All alarms, potential root causes and dedicated remedies are explained in the ifu.
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