20
Technical Description
TREND II BILEVEL ST20
The device has two different adjustable pressure lev-
els. A higher level for inspiration and a lower level for
expiration.
Trigger device
The respiration trigger detects the patients efforts to
breath in and out and signals these efforts to the con-
trol device. A
fl
ow-based trigger is integrated which can
be set separately for inspiration and expiration. While
the pressure increases during inspiration it decreases
during expiration. In connection with an optimum slope
adjustment this results in a ventilation which is very
comfortable for the patient and which gives the patient
the impression as if the device is following the natural
respiration without delay.
In the device are the modes S-, ST- and T-mode inte-
grated.
S-mode
Spontaneous trigger – the change from one pressure
level to another is triggered by starting respiration of the
patient only. A decline in pressure to the set lower pres-
sure level also occurs once the inspiration
fl
ow ends.
