+49 8142 448 460
[email protected]
www.medingmbh.com
7 von 36
medin Medical Innovations GmbH
Adam-Geisler-Str. 1
D-82140 Olching
OP_medinSINDI EN
Rev 14 Stand 30.10.2017
1.
Product Description
medinSINDI
®
universal gas supply unit with pressure monitor is an electronic unit with microprocessor-
controlled monitoring and is used to display the set parameters. The unit is battery-operated and is charged by
an external power supply plug. The screen is backlit. The operating time without mains power is approximately
5 hours. The oxygen concentration is determined in the gas flow delivered. The O
2
cell is delivered ready to use
by a known manufacturer. This cell generates an analogous DC voltage proportional to the oxygen
concentration. The cell itself does not need any supply voltage. It should be treated like a battery. The cell is a
consumable and must be calibrated in the device from time to time and replaced every 12 months. The
calibration is performed using internal software as a two-point calibration (21% and 100% O
2
).
The CPAP generated is determined by an electronic pressure transducer. This has a supply voltage of 9 V. The
CPAP pressure value to be recorded is between 0 and 20 cmH
2
O. The clinically relevant value is 5 - 8 cmH
2
O.
The design of the displays ensures easy operation by the user. All necessary calibration steps run automatically
and are accessed via a service menu. This is provided with a security code.
The system consists of two main components:
1.1.
Pneumatic Blender
The pneumatic blender is an air and oxygen mixer with an integrated flowmeter. It has an acoustic alarm unit
and a safety warning system in the event of low gas pressure. Normal operating pressure of the mixer is 350
kPa (3.5 - 6.0 bar). In the event of reduced inlet pressure of one of the gases, the mixer automatically reduces
the pressure of the other gas, as long as the difference between the two gases is not greater than 100 kPa (1
bar). The flowmeter with a needle valve can be adjusted from 0 to 16 L per minute.
1.2.
Electronic Monitoring Unit
The oxygen content is read into a memory by pressing the "Confirm FiO
2
Alarm“ button and it is compared with
deviations of ± 10% from the current concentration and monitored. If the FiO
2
is changed on the device, this
must be confirmed by once again pressing the "Confirm FiO
2
" button, otherwise the device alarm will sound.
The oxygen concentration is shown in digital and analogue form on the display. In the event of an alarm, the
display blinks and an acoustic alarm is triggered. The alarm can be silenced for 2 minutes by pressing the
"Reset" button. The visual alarm remains active until any problems are corrected.
The channel for the CPAP (continuous positive airway pressure) is fully independent from the FiO
2
. It is likewise
displayed in analogue and digital form. The analogue value is shown in coordinate axes whose size is shown by
the abscissa (perpendicular plane). The low scan speed for the ordinate was deliberately selected.
Warning – Gas Supply Pressure
If the difference between the gas pressures of the two gases is more than 1 bar, an internal valve opens in
order to compensate for the lower gas supply. This will trigger an acoustic alarm. As of this point in time, the
mixer loses its function and the oxygen content of the gas mixture becomes uncontrollable.
Important Note – Supply Gas
-
To ensure high respiratory flows, the mixer must be properly connected to full gas cylinders (O2
and air) or a central gas supply.
-
The gas supply must be controlled and monitored.
-
When gas bottles are used: set initial pressure regulator to a pressure between 3.5 and 6.0 bar.
-
When connected to a central gas supply system: use pressure reducers at the gas supply tubes to
compensate for pressure differences (see list of accessories on page 29)
