Testing equipment required
Preparing for final check
Entering the device data
Testing for leaks and pressure reading
Self-test when device is switched on
Functional check on controls
(button check)
Functional test and alarms
Battery power
Test pressure sensors
Functional check on frequency setting
Functional check
at 4.5 bar input pressure and
10 mbar back pressure
Checking O2 concentration
Functional check on pressure limit
Functional check on relief valve
without patient valve
Checking the type plate data
Check on external condition
Documentation
gas connection
Opening the device
Closing the device
Replacing button cell
Changing the speaker
Changing the board
Replacing the pneumatic block
Replacing the 3/2-way magnetic valve 29
Calibrating the potentiometer
(after changing pneumatic block
including potentiometer)
Changing upper part of housing
Changing the fascia film
Changing lower part of housing
For decades WEINMANN has been developing,
manufacturing and marketing devices for emergency medical care, oxygen therapy and inhalation
therapy.
In 1972 WEINMANN put the first MEDUMAT
emergency respirator on the market.
MEDUMAT emergency respirators are automatic
respirators. They are used for controlled respiration
in emergency medical care, e.g. in cases of acute
respiratory disorders, and also secondary obstructions.
The new generation of devices, developed specifically to meet users’ requirements and put on the
market in 1997, offers users and patients increased security. An intelligent alarm system monitors the patient’s breathing and informs the user
about any problems that occur. These devices thus
offer even greater security and reliability during
respiration.
The aim of these servicing and repair instructions is
to familiarise you, as an expert in the field, with the
function, technology, servicing and repair of the
MEDUMAT respirator. Thanks to training which you
have already received from WEINMANN, you now
count as “trained expert personnel” and can therefore give your customers appropriate instructions,
remedy problems on your own and perform the
functional checks prescribed in the operating instructions and any repairs required in accordance with
these Service and Repair Instructions.
In the event of a warranty claim, send the MEDUMAT
to WEINMANN.
To enable us to process ex gratia requests or warranty claims, please enclose the customer’s proof
of purchase (invoice) with the device.
Repairs or servicing work may be performed only
by WEINMANN or by trained specialist staff.
You are responsible for repairs carried out yourself
and for their warranty!
Use only original WEINMANN spares for repairs.
Please bear in mind:
Your customer trusts you and relies on your expert
capability, just as you rely on WEINMANN.
Note:
For the following information, please consult the Operating Instructions for MEDUMAT:
•Safety Information
•Fitting accessories
•Operating MEDUMAT emergency respirators
•Hygienic preparation
•Functional check
Introduction3
1. Overview
Control panel MEDUMAT Easy
1 Mask/tube ventilation
switch with indicator
LEDs
2 Respiratory pressure
indicator (bar graph)
60
mbar
50
40
30
20
10
0
11
9
10
7
11
16
5
30
3
MV (l/min)
Stenosis
Disconnection
< 2,7 bar O
12
10
12
Freq.(min
3 Alarm panel
MEDUMAT
Easy
2
14
15
13
14
16
Demandflow
-1
)
4 Alarm confirmation
5 Colour code
6 Adjuster knob, ventilation parameters
7 Index position
8 LED Demandflow
9 ON/OFF switch
Connections MEDUMAT Easy
r
a
b
10 Pressurized gas
connection
15 Relief outlet valve
m
60
50
40
30
20
11
10
10
9
0
10
11
7
16
30
5
eq.(
r
F
3
l/min
(
V
M
T
A
M
U
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M
sy
a
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15
13
16
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-
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a
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D
w
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f
-1
)
in
m
)
60
50
40
30
20
10
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4
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10
1
6
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14
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)
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Fr
3
)
n
i
m
/
l
(
V
M
11 Battery compartment
12 Speaker
13 Pressure gauge hose
connection
14 Ventilation hose connection
4Overview
1.1 Special symbols on the ventilator
Symbols on MEDUMAT Easy
Typ :
T
A
M
EDU
M
y
as
E
s
i
s
o
n
e
t
S
n
o
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t
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7
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<
50
40
30
20
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11
10
14
12
10
9
15
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10
13
16
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11
7
-
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-
)
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)
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/
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Inlet 2,7 - 6 bar O2.
T
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UM
ED
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Easy
e
t
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e
r
P
mbar
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0
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b
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5
0
4
0
3
0
2
2
1
1
1
0
4
1
1
2
1
0
1
9
5
1
0
0
3
1
1
6
1
4
1
1
1
7
6
1
30
5
3
SN
MEDUMAT Easy device information plate
Serial number of device
Year of manufacture
Do not dispose of device in domestic waste.
Safety check and servicing label
Servicing label: indicates when the next service is due.
Safety check label: (in Germany only) marks when the next safety check as per §6 of the German
law relating to users of medical devices is required.
Overview5
2. Description
2.1 Uses
MEDUMAT Easy is an automatic oxygen respiration device (short-term ventilator) with additional inhalation
facility.
You can use MEDUMAT Easy:
•to revive patients at the site of the emergency;
•for longer periods in more protracted
emergencies, e.g. fires;
•for short-term O2 inhalation using a respiration
mask.
You can use MEDUMAT Easy while transporting
patients:
•between the various rooms and departments
of a hospital;
•between the hospital and other premises;
2.2 Ventilation function
MEDUMAT Easy operates within a pressure range
of 2.7 to 6 bar and at a flow rate of not less than
70 l/min O2. It has a built-in power supply.
It uses high-pressure, medicinal-grade oxygen. An
external pressure reducer brings this down to the
required operating pressure. The oxygen supply is
fed in at input valve 10.
The ventilation settings are continuously variable.
These settings (frequency and volume per minute
are coupled) and the inspiration/expiration ratio
of 1:1.67 are regulated by internal electronic
control mechanisms.
•in emergencies;
•when transport over considerable distances is
planned.
MEDUMAT Easy:
•is designed to provide controlled ventilation to
persons of 10 kg body weight or more;
•is used to treat respiratory arrest;
•can be preset to parameters that ensure evenly
balanced ventilation, provided that the
selected maximum ventilation pressure P
max
is
not exceeded;
•permits breathing-controlled oxygen inhalation
in Demand mode.
MEDUMAT
Easy
Stenosis
r
a
b
m
Disconnection
2
60
10
< 2,7 bar O
50
40
30
20
12
11
10
14
12
10
9
15
0
10
13
16
14
11
7
Demand-
w
16
flo
30
5
-1
)
q.(min
Fre
3
MV (l/min)
The gas for inspiration flows along the hose and
through the patient valve and either the mask or
tube into the patient’s airways. The patient valve is
fitted with a lip membrane that enables expired
gas to be conducted away through the expiration
tube.
6Description
You can check the course of ventilation on the
10
respiration pressure indicator 2.
2.3 Demandflow function
mbar
60
50
2
40
30
20
10
9
0
The Demandflow setting switches the
MEDUMAT Easy to breathing-controlled O2
inhalation. Such inhalation must be carried out
with the respiration mask. A small inspiration
(trigger) pulse causes oxygen to continue flowing
until slight overpressure interrupts the flow.
Expiration then takes place via the patient valve as
in ventilation.
2.4 Patient valve
The gas for inspiration is channelled into the
patient’s airways through the patient valve.
The valve is designed to enable spontaneous
breathing in the event of failure of the
MEDUMAT Easy.
0
Demandflow setting
12
11
9
10
10
7
11
16
5
30
3
Freq.(min
MV (l/min)
12
14
15
13
14
16
Demandflow
-1
)
38
37
39
403435 36 41
2.5 Audio response
The device has an audio response facility that can
be switched on for user guidance, especially for
users who have little practice.
If audio guidance is not wanted, it can be
switched off by pressing a combination of keys
(see “4.10 Audio response for user guidance” in
the operating instructions).
Description7
3. Final check
After every repair and every service, the device
must be subjected to the following final check in
accordance with Test Instructions WM 28001
and the test record.
Note:
For the final check on the MEDUMAT Easy you
must connect the ventilation hose and the patient
valve to the device.
MEDUMAT Easy must not be used if the final
check reveals defects or deviations from the
specified parameters.
We recommend that you always hold reserve
stocks of the following items:
•replacement washers for the connections;
•lip membrane for the patient valve.
•membrane for spontaneous breathing tube;
•membrane for exhalation tube;
•O-ring 1145/118.
3.1 Testing equipment required
•Volume flow meter, Type RT 200 (Timeter), Type EKU VIP – ventilator, PF 300 Imtmedical or comparable
test device
•Adjustable orifice, e.g. ball valve, internal diameter ≥ 10 mm
•Test set for functional checks WM 15323
•Oxygen concentration meter, 0 – 100% ± 1%,
e.g. Type Oxycontrol WM 13550
•Set, hose with syringe WM 15359
•Pressure gauge 0 - 6.3 bar, class 1.6
•Pressure gauge 0 -100 mbar, class 1.6
•Set, supply test Medumat / Modules WM 15440
3.2 Preparing for final check
1. Connect MEDUMAT Easy to the 4.5 - 6 bar pressure supply.
2. Connect ventilation hose and pressure measurement tube to MEDUMAT Easy.
If audio response is enabled, you will hear the sentence “Open oxygen cylinder” before the self-test starts.
1. Apply 4.5 bar to the input.
2. Switch on MEDUMAT Easy at button 9.
Requirement: The self-test starts, the ventilation mode LEDs light up once each one after the other, the alarm
LEDs flash, the pressure indicator LEDs are run through 3 times, a signal tone sounds and an audio
response sentence is spoken.
3.6 Functional check on controls (button check)
1. Open the pressure supply.
2. Switch on the device.
3. Switch from mask ventilation to tube ventilation.
4. Press the alarm acknowledgement button.
Final check9
3.7 Functional test and alarms
3.7.1 Test Stenosis alarm
•Switch to tube ventilation () and close patient valve outlet.
•Operate device at Freq. setting = 30 min-1 and MV = 3 l/min.
Requirement: The Stenosis alarm must be triggered after two ventilation cycles. If audio response is
enabled, the ventilator announces “Check airways and minute volume”.
3.7.2 Checking alarm confirmation
•Immediately after the first alarm tone sounds, press Alarm confirmation button 4.
Requirement: The alarm tone must be suppressed immediately.
3.7.3 Test Disconnection alarm
•Open patient valve outlet.
Requirement: The Disconnection alarm must be triggered after two ventilation cycles. If audio response
is enabled, the ventilator announces “Check ventilation system and settings”.
3.7.4 Test Pressure alarm
•Shut off pressurised gas connection of MEDUMAT (2.7 - 6.0 bar).
Requirement: The Pressure alarm must be triggered. If audio response is enabled, the ventilator
announces “Check pressure hose system and gas supply”.
3.7.5 Checking Demand mode LED
•Open the pressure supply.
Requirement: Demand mode LED must come on (flickering).
3.7.6 Check voice output
3.8 Battery power
3.8.1 3.0 V battery (on board)
Since the 3.0 V lithium cell is difficult to access, its
charge status can be checked both via the
interface and in a relevant menu.
To do so, hold down the alarm confirmation button
while switching the device on. The device is then
in battery check mode for 3 seconds, before
switching to normal operating mode.
During this 3-second period the “Power supply”
alarm in the alarm panel lights up and the voltage
measured for the lithium cell is shown on the
pressure bar graph.
The adjacent table shows how the voltage
readings correspond to the bar graph values.
Bar graph value (mbar)Battery voltage (V)
603.21
553.19
503.17
453.15
403.13
353.11
303.09
253.07
203.05
153.03
103.01
52.99
02.97
10Final check
Requirement: Voltage measured for 3.0 V battery is in the range 3.0 to 3.2 V; the alarm for this cell is
triggered at 2.7 V.
3.8.2 3.6 V battery (battery compartment)
Remove the 3.6 V battery from the battery compartment and measure the voltage with a digital multimeter.
Requirement: Voltage measured for 3.6 V battery is in the range 3.4 to 3.7 V.
3.9 Test pressure sensors
3.9.1 Input pressure sensor
•Shut off pressurised gas connection of MEDUMAT (2.7 - 6.0 bar).
Requirement: The Pressure alarm must be triggered. If audio response is enabled, the ventilator
announces “Check pressure hose system and gas supply”.
3.9.2 Ventilation pressure sensor
•Connect ventilation hose to test bag.
•Run device with settings: Freq. = 10 min-1 and MV = 11 l/min.
•Switch device to mask ventilation.
Requirement: The pressure limit must respond at 20 ± 5 mbar.
•Switch device to tube ventilation.
Requirement: The pressure limit must respond at 45 ± 5 mbar.
3.9.3 Demand flow sensor
1. Supply device with pressure.
2. Switch on MEDUMAT Easy at button 9.
3. Connect ventilation tube and patient valve to test bag.
4. Set MEDUMAT Easy to demand flow mode.
5. Green LED in demand mode button illuminates.
6. Squeeze the test bag.
Requirement: Releasing the test bag triggers a short ventilation.
Final check11
3.10 Functional check on frequency setting
T
A
M
U
D
E
M
y
s
a
E
Stenosis
tion
c
r
a
b
Disconne
m
O
2
r
60
,7 ba
2
<
50
40
30
20
12
11
10
14
12
0
1
9
5
1
0
0
3
1
1
6
1
14
11
7
16
0
3
5
3
Patient valve with
hose system
Volume flow meter
Orifice 10 mbar
open
•Connect ventilation hose to 10 mbar orifice and to volume flow meter.
•Run device with settings: Freq. = 14 min-1 and MV = 16 l/min.
Requirement: The frequency must be 14 ± 2 min
-1
.
•Run device with settings: Freq. = 10 min-1 and MV = 11 l/min.
Requirement: The frequency must be 10 ± 2 min
-1
.
•Run device with settings: Freq. = 30 min-1 and MV = 3 l/min.
Requirement: The frequency must be 30 ± 2 min
-1
.
3.11 Functional check breath volume at 4.5 bar input pressure and
10 mbar back pressure
T
A
M
U
D
E
M
y
s
a
E
is
s
o
n
te
n
S
io
t
c
e
n
n
o
c
is
bar
D
m
O
2
r
0
a
6
b
7
,
2
<
0
5
0
4
0
3
0
2
2
1
1
1
0
4
1
1
2
1
0
1
9
5
1
0
0
3
1
1
6
1
4
1
1
1
7
6
1
0
3
5
3
Patient valve with
hose system
Volume flow meter
Orifice at 10 mbar
setting
•Run device with settings: Freq. = 14 min-1 and MV = 16 l/min.
Requirement: Breath volume must be 1140 ± 170 ml.
•Run device with settings: Freq. = 10 min-1 and MV = 11 l/min.
Requirement: Breath volume must be 1100 ± 170 ml.
•Run device with settings: Freq. = 30 min-1 and MV = 3 l/min.
Requirement: Breath volume must be 100 ± 20 ml.
12Final check
3.12 Checking O2 concentration
•Run device with settings: Freq. = 10 min-1, MV = 11 l/min and 100% O2.
Requirement: The O
concentration must be > 98%.
2
3.13 Functional check on pressure limit
•Connect ventilation hose to test bag.
•Run device with settings: Freq. = 10 min-1 and MV = 11 l/min.
•Switch device to mask ventilation.
Requirement: The pressure limit must respond at 20 ± 5 mbar.
•Switch device to tube ventilation.
Requirement: The pressure limit must respond at 45 ± 5 mbar.
3.14 Functional check on relief valve without patient valve
•Run device with settings: Freq. = 11min-1 and MV = 7 l/min.
•Switch ventilation hose to test bag.
Requirement: The test bag is fully inflated during the inspiration stroke. The ventilator is then heard to
release pressure.
3.15 Checking the type plate data
•Check type plate data against drawing.
Requirement: The type plate data must be correctly entered in accordance with the drawing.
Final check13
3.16 Check on external condition
•Check external condition.
Requirements: The outside of the device is not scratched and there are no flaws.
The connection thread is undamaged and screws easily.
The adjuster knob is secured by self-locking against inadvertent changes.
Elbow outlet turns easily.
3.17 Documentation
•Document items 3.3 to 3.16, and also test date and tester number, in the test record.
14Final check
4. Servicing
Note:
Remember to perform a final check after every repair.
We recommend that maintenance work such as inspections and repairs be performed only by the
manufacturer, i.e WEINMANN, or by qualified technicians expressly authorized by WEINMANN.
4.1 Intervals and scope
Every 2 years:
Every 2 years the device (incl. patient valve and hose system) must undergo servicing and be subjected to a
safety check as specified below.
You can also have servicing and the safety check performed by WEINMANN.
Be sure to check the following items:
•Check equipment for completeness;
•Visual check:
– Mechanical damage
– Labelling of controls
– Damage to all external hoses;
•Renew parts subject to wear / parts requiring
compulsory replacement (see “7.2 Service
sets” on page 37);
•Final check in accordance with Test Instructions/
Test Record STK WM 28001 (see “3. Final check”
on page 8 and see “11. Repair and service
records” on page 43).
Every 4 years:
•Servicing of the fittings in the oxygen supply system (e.g. pressure reducer) either by the manufacturer or
by a specialist expressly authorized by the manufacturer.
Every 10 years:
•Repeat testing of conventional steel or aluminium oxygen cylinders by the responsible testing
organisation. The repeat testing date is stamped on the shoulder of the cylinder.
Servicing15
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