Description
162 Instructions for use Oxylog 3000 plus SW 1.n
Safety
In the event of a fault, gas blender V1-3 closes and
Pressure Control V6 opens to the atmosphere. The
pneumatic demand valve NV (spontaneous
breathing) opens in the presence of negative
pressure. The pneumatic relief valve SV (set to
approximately 80 mbar) opens in the event of
excess pressure.
Software
The software is developed according to the internal
software development process and will be
subjected to code inspections, integration tests and
system tests.
When an error has been detected the device will fail
in a fail safe mode.
Monitoring
The flow measured on the patient side by S8 is
transmitted to the internal electronic pressure
difference sensor S6 as a differential pressure
signal. The measured monitoring values of the tidal
volume, minute volume and respiratory rate are
derived from the measured expiratory flow. The
inspiratory flow signal is used for detection of the
flow trigger. System leakages can be identified from
the balance of inspiratory and expiratory tidal
volumes (e.g., leakage alarm, NIV).
Airway pressure measurement on the patient side
supplies the Paw values for the airway pressure on
the display via S5, as well as for the derived
measured values PEEP, PIP, Pplat, Pmean. The
plausibility of this airway pressure measurement on
the patient side is monitored by a redundant
internal airway pressure measurement in the
ventilator via S4 in the inspiratory duct.
CO2 measurement
CO2 is measured by a mainstream system based
on absorption measurement. A light source
generates a spectrum and two light detectors
record the characteristic absorption spectrum and
supply electrical signals that change with the CO
2
concentration. These signals are then evaluated
and displayed. Heating the CO
2 sensor probe
prevents condensation.
When the CO
2 sensor is connected or a power
supply failure has occurred, it will first complete its
warm-up phase (approximately 3 minutes). During
warm-up:
–etCO2 and CO2 values have a reduced
accuracy;
– Zero calibration and filter check remain on hold;
– The alarm !!! Check cuvette type is inactive.
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