Functional Description Of Somnosoft - Weinmann SOMNOsmart 2 WM 24900 Manual

2.6 Functional description of SOMNOsoft +

SOMNOsoft + works on the principle of an elec-
trically powered flow generator delivering an elec-
tronically controlled constant pressure level.
A radial fan draws in ambient air through a filter
and conveys it to the device outlet port. From here
the air flows through the hose system and mask to
the patient.
The airway pressure is registered via the pressure
measurement tube in the mask.
The pressure present in the mask is shown in the LC
display. The microprocessor-controlled flow gener-
ator regulates the pressure at the set value.
In softPAP mode the respiratory flow curve is ana-
lysed continuously to ensure timely recognition of
the transition between inhalation and exhalation.
Before the transition to exhalation the therapy pres-
sure is reduced to make it easier to breathe out.
The size of this pressure reduction can be set in two
stages: "slight" (stage 1) and "normal" (stage 2).
This increases patient comfort. Before the next in-
halation phase, the pressure is raised to the thera-
py figure once again.
If apnoea or valid flow limitations occur while the
patient is sleeping, the softPAP mode is automati-
cally deactivated for the relevant period. If the res-
piratory frequency is too high, the softPAP mode is
also temporarily deactivated. However, the thera-
py pressure remains reduced during this period.
The device also records a respiratory flow signal
that can be output to a PSG system or read off with
the aid of SOMNOsupport. SOMNOsoft + recog-
nises apnoea, hypopnoea and respiratory flow
limitations. This permits efficient therapy control.
The exhalation system in front of the mask prevents
accumulation of CO2-enriched expired air in the
tube system.
An automatic Softstart system is provided to enable
the patient to go to sleep more easily. When this
is switched on, the pressure is reduced to the Soft-
start pressure set by the physician. The therapy
pressure then gradually increases to the set value.
The period for the pressure rise can be set in 5-
minute steps between 0 and 30 minutes. The auto-
matic Softstart system can be locked out by the
physician.
Auto switch-on can be activated on the
SOMNOsoft + The device can then be switched
on by breathing into the mask. If there is no pres-
sure for about 5 seconds (e.g. because the mask
is taken off), SOMNOsoft + switches off automati-
cally.
Following a power failure and resumption of the
power supply, the status of SOMNOsoft + is the
same as it was before the power failure. The
stored data remain preserved.
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Description