4 EN WM 100 TD and WM 100 TH
WM 67971b 09/2017
1 Introduction
1.3 Function
1.3.1 WM 100 TD therapy device
The fan in the therapy device sucks ambient air in through a filter,
compresses it, and routes it to the device outlet.
From here, the air flows through the hose system and the mask to the
patient. The exhalation system in front of the mask or optionally
integrated in the mask prevents CO
2
-enriched exhaled air from
collecting in the hose system. The therapy device determines and
analyzes the pressure and respiratory flow signal. This allows
respiratory events to be recognized.
The pressure sensor is connected to the device outlet via a hose,
allowing measurement of the pressure close to the device.
The flow sensor is connected to a flow element directly via 2 seals. The
flow element contains many lamellae, which create a laminar flow. The
laminar flow results in a pressure drop. The flow sensor calculates the
resulting differential pressure. With the aid of additional state
parameters, such as the absolute pressure, the flow sensor can also
determine the flow rate.
The device can function with one pressure level (CPAP) or with two or
three pressure levels (BILevel or inspiratory pressure, expiratory
pressure, and end-expiratory pressure). Depending on the version
employed, the pressure levels can be set automatically by the device
within preset limits, or they can be set manually. Depending on the
mode, the pressure can be continually applied at one level, or triggered
by the patient or applied with time controls. Pressure signals,
respiratory flow signals, and respiratory events can be saved and/or can
be output in analog form on a PSG system.
The therapy data are saved in the device and on an SD card for therapy
control.
The device is operated via an On/Off button and a touchscreen.
The prismaTS therapy software can be used to control the therapy
device remotely from a PC.
In the case of a power failure, the settings are retained and the therapy
is continued once the power supply is restored.
Mainboard
The mainboard forms the core of the therapy device. It contains
important components such as the flow and pressure sensors, memory
module, and controller. The controller is programmed with the
respective device firmware, which includes the whole algorithm for
device control.
In addition, the mainboard is also responsible for all the energy
management of the therapy device.
Touchscreen
The touchscreen is used to display all the information and, at the same
time, for operating and setting the therapy device. It is a resistive
touchscreen.
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