Principles of Operation
128
Instructions for Use Oxylog 3000 SW 1.n
The device then produces an increase in pressure
up to the preselected ASB pressure ΔASB above
PEEP, which is adjustable to the breathing
requirement of the patient.
The time for this pressure increase (Ramp) is
adjustable:
– In case of rapid increase in pressure, the
Oxylog 3000 supports the insufficient
spontaneous breathing of the patient with a high
peak flow.
– In case of slow increase in pressure, the
Oxylog 3000 begins gently with regular
inspiratory flow. The patient has to take over
more breathing effort.
With the patient adjusted pressure increase and the
pressure ΔASB above PEEP, the patient's own
breathing activity defines the required inspiration
flow.
ASB is terminated:
– when the inspiration flow returns to zero during
phase I, i.e. when the patient exhales or fights
the ventilator.
Or
– when the inspiration flow in phase II falls below
25% of the inspiration flow previously supplied
(and thus ΔASB above PEEP is reached).
Or
– after 4 seconds if the two other criteria have not
come into operation.
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