Instructions for Use Oxylog 2000 plus SW 1.n 121
Principles of Operation
Functional description
The variable pneumatic actuators in the
Oxylog 2000 plus are controlled by the micropro-
cessor system via digitized electrical signals.
Gas supply
The supply gas O2 is purified by filter F1 and
adjusted to a constant pressure by pressure
regulator DR. Ambient air is taken in via filter F2 as
required. The supply pressure is monitored by
pressure sensor S3.
Inspiration
Gas blender V1-3 delivers the variable inspiration
flow as a mixture of supply gas O2 and ambient air
in accordance with the ventilation mode and
required O
2 concentration. The tidal volume is
applied regardless of ambient pressure (absolute
pressure sensors S7 and S9) under patient condi-
tions BTPS for volume-controlled breathing; the
applied tidal volume corresponds with that set for
BTPS, taking into account the ambient pressure. In
this way, Oxylog 2000 plus meters and measures
roughly 10% less volume in operation with a test
lung (dry gas at room temperature).
Expiration
During volume-controlled inspiration, pressure con-
trol V6 closes the inspiratory canal and controls the
PEEP pressure during expiration or reduces the
pressure in the inspiration hose to control the PS,
Pinsp or Pmax pressure when the target values are
reached. Breathing valve V10 on the patient side,
which is indirectly controlled by V6, seals off
against atmospheric air during inspiration and
adjusts the required patient pressure during expira-
tion by controlling the pressure in the inspiration
hose. The measured value of the airway pressure
sensor S5 on the patient side serves as a set point
for pressure regulation.
044
Microprocessor system
Pressure control V6
O
2
F1
F2
DR
SV
S8
S4
S9 S7 S5 S6
NV
V10
V7 V8
S3
Gas blender
V1 - 3
P
P
E
P
E
P
E
P
E
P
E
E
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