Weinmann WM 28140 Service Manual
MEDUMAT Easy CPR
Ventilator
Service and Repair instructions
WM 28140
Contents
Introduction
1.
Overview
1.1
2.
Description
2.1
2.2
2.3
2.4
2.5
2.6
3.
Final check
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
3.11
3.12
3.13
3.14
3.15
3.16
3.17
4.
Servicing
4.1
4.2
4.3
5.
Troubleshooting
6.
Repair information and instructions
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
6.10
6.11
6.12
6.13
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Special symbols on the ventilator
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Uses
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Ventilation function
Demandflow function
Patient valve
Audio response
Switching the metronome on and off
. . . . . . . . . . . . . . . . . . . . . . . . . 12
Test material required
Preparation for the final check
Enter device data
Check for leaks and check
pressure display
Self-test after the device is switched on
Function check of controls (key test)
Function check and alarms
Battery voltage
Function check of frequency setting
Function check of
at 4.5 bar input pressure
and 10 mbar back pressure
Test O2 concentration
Function check of pressure limit
Function check of venting valve without
patient valve
Test MEDUtrigger
Test communication socket
Check external condition
Documentation
. . . . . . . . . . . . . . . . . . . . . . . . . . 24
Intervals and scope
Batteries
Storage
General
Changing the filter in the pressurised
gas connection
Open the device
Close the device
Replacing button cell
Changing the speaker
Changing the board
Replacing the pneumatic block
Replacing the 3/2-way magnetic valve. 39
Calibrating the potentiometer
(after changing pneumatic block
including potentiometer)
Changing upper part of housing
Changing the fascia film
Replace lower part of housing
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breath volume
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43
7.
Spare parts
7.1
7.2
8.
Tools and Test Equipment
8.1
8.2
8.3
9.
Technical data
9.1
10.
Technical Changes
11.
Repairs and maintenance protocols
. . . . . . . . . . . . . . . . . . . . . . . . 46
Spare parts list
Service sets
General tools
Special tools
Testing equipment
Pneumatic
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/ electronic systems
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53
© Copyright
The content and presentation are copyright protected and may only be used by authorised WEINMANN Service Partners in
the course of their service operations. The content must not be reproduced or passed on to third parties. The complete documents
must be returned on termination of the cooperation with WEINMANN.
WEINMANN GmbH & Co. KG.
Introduction
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 ventilator on the market.
MEDUMAT emergency ventilators are automatic
ventilators. They are used for controlled ventilation
in emergency medical care, e.g. in cases of acute
ventilation 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 ventilation.
The objective of these Servicing and Repair
Instructions is to make you, an expert, familiar with
the function, technology and repair of the
MEDUMAT ventilator. 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, 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.
Bear in mind:
Your customer trusts you and relies on your expert
capability, just as you rely on WEINMANN.
Note:
For the following informations, consult the Operating Instructions for MEDUMAT:
• Safety Information
• Fitting accessories
• Operating MEDUMAT emergency ventilators
• Hygienic preparation
• Functional check
Introduction 3
4
1. Overview
Control panel MEDUMAT Easy CPR
1 Mask/tube ventilation
switch with indicator
LEDs
2 Ventilation pressure
indicator (bar graph)
60
mbar
50
40
30
20
10
0
0,9
10
0,6
11
16
0,3
30
0,1
Stenosis
Disconnection
< 2,7 bar O
1,1
10
Freq.(min-1)
Vt (l)
3 Alarm panel
12
13
14
MEDUMAT
Easy CPR
2
CPR
1,1
Demandflow
4 Alarm mute
5 Colour code
6 CPR key and indicator LED
7 Adjuster knob, ventilation parameters
8 Index position
9 LED Demandflow
10 ON/OFF switch
Connections MEDUMAT Easy CPR
11 Pressurized gas
connection
17 Relief outlet valve
60
50
40
30
CPR
20
10
0
13
14
1,1
0,6
0,3
AT
12 Battery compartment
CPR
0,9
10
11
13 Speaker
14 MEDUtrigger connection
15 Pressure gauge
hose connection
16 Ventilation hose connection
Overview
1.1 Special symbols on the ventilator
MEDUMAT Easy CPR
AT
60
50
40
30
CPR
1
2
20
10
0
13
14
1,1
0,6
0,3
1 Inlet 2,7 - 6 bar O2.
2 Languages available for the device
MEDUMAT Easy CPR device information plate
SN
Serial number of device
Year of manufacture
3.6 V lithium battery
CPR
0,9
10
11
4 5 6 7 8
3
3
CE symbol (confirms that the product conforms to the applicable European directives)
IP54 Protection against ingress of water and dust
Protection class BF
Do not dispose of the device in domestic waste.
5 Patient circuit connection
6 Maximum pressure ≤ 100 mbar
8 Indicates where to connect the MEDUtrigger
Safety check and servicing labe
7 Servicing label: indicates when the next service is due.
4
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.
Overview 5
MEDUtrigger
9
MEDUtrigger device information plate
BF protection class
Do not dispose of the device in domestic waste
9
IP54
CE symbol (confirms that the product conforms to the applicable European directives)
Protection against ingress of water and dust
Protection class II, protective insulation
Date of manufacture
6 Overview
2. Description
2.1 Uses
MEDUMAT Easy CPR is an automatic oxygen
ventilation device (short-term ventilator) with
additional inhalation facility.
You can use MEDUMAT Easy CPR:
• to revive patients at the site of the emergency;
• for longer periods in more protracted emergencies;
• for short-term O2 inhalation using a ventilation
mask.
You can use MEDUMAT Easy CPR while
transporting patients:
• between the various rooms and departments
of a hospital;
• between the hospital and other premises;
• in emergencies;
• when transport over considerable distances is
planned.
MEDUMAT Easy CPR:
• is designed to provide controlled ventilation to
persons of 10 kg body weight or more;
• is used to treat ventilation arrest;
• can be preset to parameters that ensure evenly
balanced ventilation, provided that the selected maximum ventilation pressure P
ceeded;
• permits breathing-controlled oxygen inhalation
in Demand mode;
• enables the user to initiate individual ventilation strokes in CPR mode.
is not ex-
max
Description 7
2.2 Ventilation function
MEDUMAT Easy CPR 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 11.
The infinitely adjustable ventilation values
(frequency and tidal volume are linked) and the
inspiration/expiration ratio of 1:1.67 are
regulated by internal electronic control
mechanisms.
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.
You can check the course of ventilation on the
ventilation pressure indicator 2.
11
60
50
40
30
20
10
0
60
50
2
40
30
20
10
0
CPR
13
14
1,1
0,6
0,3
mbar
0,9
2.3 Demandflow function
The Demandflow setting switches the
MEDUMAT Easy CPR to breathing-controlled O2
inhalation. Such inhalation must be carried out
with the ventilation 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.
Demandflow setting
10
0
0,6
0,3
0,9
11
10
16
0,1
1,1
10
30
Freq.(min-1)
Vt (l)
12
13
14
1,1
Demandflow
8 Description
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 CPR.
2.5 Audio response
The device has an audio response facility which
can be switched on for user guidance, especially
for users with little practice.
The language can only be set if the device is
switched off beforehand.
21
20
22
23 17 18 19 24
To select a language or to switch off the audio
response facility, proceed as follows.
1. Hold down the mask/tube switch 1.
2. Switch on the device at the ON/OFF switch
10.
3. Now release the mask/tube switch 1. The
device is now in the language selection menu.
The ventilation pressure indicator now displays
the most recent language setting selected.
Description 9
The following languages are assigned to the
individual LEDs.
Device number mbar Language
60 Icelandic
55 Finnish
50 Norwegian
45 Swedish
40 Danish
WM 28140
WM 28150 (French
variant)
WM 28160
35 Portuguese
30 Spanish
25 Dutch
20 Italian
15 French
10 English
5 German
0 Audio response off
60 Farsi
55 Thai
50 Indonesian
45 Turkish
40 Arabic
35 Japanese
30 Chinese
25 Czech
20 Russian
15 Polish
10 English
5 German
0 Audio response off
4. Now press the mask/tube switch 1 as many
times as necessary until the LED for the desired
language lights up and a corresponding
message is heard (example: 10 mbar LED,
language: English, message: “Selected
language: English.”). After five seconds, the
new selection is stored.
By pressing the ON/OFF switch 10 briefly you
can store the language selection without waiting
for five seconds.
Select the setting 0 (0 mbar) if you want to switch
off the audio response facility. You will then hear
the message: “Audio response is off!” in the
language most recently selected.
After approx. 5 seconds, the new setting is
automatically stored. The LED for the selected
language/setting goes out.
10 Description
2.6 Switching the metronome on and off
1. With the device switched off, press and hold
the CPR key.
2. Press the On/Off switch 10 briefly.
3. Release the CPR key.
4. Press CPR key.
50 mbar LED (red) comes on:
the metronome is activated
45 mbar LED (green) comes on:
the metronome is deactivated
5. Press the CPR key to change the operating
state of the metronome.
6. Press On/Off key 10 to confirm the operating
state of the metronome.
1 x audible confirmation:
metronome deactivation is confirmed
2 x audible confirmation:
metronome activation is confirmed
Description 11
3.
Final check
The device must be subjected to a final check after
every repair and every service.
Note:
For the final check on
must connect the ventilation tube and the patient
valve to the device.
MEDUMAT Easy CPR
check reveals defects or deviations from the
specified values.
3.1
Test material required
•
Flow meter PF 300 from imtmedical, type EKU VIP, or comparable test device
•
Adjustable orifice, e.g. ball cock, internal diameter ≥ 10
•
Test kit for function check WM 15357
•
Oxygen concentration measuring device, 0 – 100 % ± 1 %,
e.g. type Oxycontrol WM 13550
•
Tube set with syringe WM 15359
•
Pressure measuring device
•
Pressure measuring device
•
Set, power supply test for Medumat / Module WM 15440
•
Test adapter
MEDUMAT Easy CPR
must not be used if the final
, you
0 - 6.3 bar, Class 1.6
0 - 100 mbar, Class 1.6
WM 20907
We recommend always keeping the following in
stock:
•
replacement seals for the device connections;
•
lip membrane for the patient valve;
•
membrane for the spontaneous breathing
tube;
•
membrane for the expiration tube.
mm
Default settings for flow meter PF300
Settings
Default settings:
–
Type of gas
–
Gas standardization
Trigger settings:
–
Type of ventilation
–
Source
–
Start
–
End
–
Delay
–
Base flow rate
Units and measured values:
–
P high
–
P diff
–
Rate
–
V
ti
–
O
2
If you have a comparable testing device, contact
Weinmann Technical Support to have the setting parameters calibrated.
Air/O2 auto
STP
Adult
Internal HF
Flow rate ≥ 3.0 l/min
Flow rate ≤ 3.0 l/min
60 ms
Disabled
bar
mbar
b/min
ml
%
Values
12
Final check
3.2 Preparation for the final check
1. Device setting freq. = 30 min-1, Vt = 0.1 l
2. Check which language is set. Record setting.
3. Switch on audio response (see “2.5 Audio response” on Page 9).
4. Check whether the metronome is on or off (see “2.6 Switching the metronome on and off” on Page 11).
Record setting.
3.3 Enter device data
1. Enter the device data from the device information plate in the test protocol and check the device
information plate is complete and undamaged.
3.4 Check for leaks and check pressure display
3.4.1 Check for leaks on inlet side
60
50
40
30
CPR
20
10
0
13
14
1,1
0,6
0,3
1. Provide a pressurized gas supply to MEDUMAT Easy CPR and to the flow meter.
2. Switch off device.
3. Open oxygen cylinder.
4. Close oxygen cylinder.
Requirement: Drop in pressure must be less than 0.2 bar/min.
Final check 13
3.4.2 Check for leaks in pressure measuring section
AT
CPR
0,9
10
11
Test pressure gage
Ventilation
pressure indicator
15
Syringe
1. Put T-tube connection with syringe (WM 15359) on the pressure measurement tube connection 15.
2. Use the syringe to generate a pressure of 55 mbar ± 2 mbar on the test pressure gage.
Requirement: Drop in pressure must be ≤ 2 mbar/min.
3.5 Self-test after the device is switched on
60
50
40
30
CPR
20
10
0
13
14
1,1
0,6
0,3
1. Provide a pressurized gas supply to MEDUMAT Easy CPR and to the flow meter.
2. Connect the patient circuit to MEDUMAT Easy CPR.
3. Open oxygen cylinder.
4. Switch on device.
Requirement: The self-test is triggered, the ventilation mode LEDs light up once each in turn, the alarm
LEDs flash, the pressure indicator LEDs are run through 3x, a signal sounds and one sentence is issued
by the audio response.
14 Final check
3.6 Function check of controls (key test)
60
50
40
30
CPR
20
10
0
13
14
1,1
0,6
0,3
1. Provide a pressurized gas supply to MEDUMAT Easy CPR and to the flow meter.
2. Open oxygen cylinder.
3. Switch on device.
4. Switch from mask ventilation to tube ventilation.
5. Press the alarm mute button 4.
6. Press the CPR key 6.
Requirement: All the controls must work perfectly.
3.7 Function check and alarms
60
50
40
30
20
10
0
13
14
1,1
0,6
0,3
CPR
1. Provide a pressurized gas supply to MEDUMAT Easy CPR and to the flow meter.
2. Open oxygen cylinder.
3. Switch on device.
Final check 15
16
3.7.1 Test stenosis alarm
1. Switch to tube ventilation (
2. Operate device at setting freq. = 30 min
Requirement:
The stenosis alarm must be triggered after 2 ventilation operations. The red LED of the
and seal off the patient valve outlet.
)
-1
and V
= 0.1 l .
t
stenosis alarm must come on. The device issues the message “Check airways and settings!”.
3.7.2 Test alarm mute function
1. Immediately after the first alarm tone sounds, press the alarm mute key
Requirement:
The acoustic alarm must be suppressed immediately. The visual alarm continues to flash.
Alarm Suppression time
Stenosis 30 seconds
Disconnection 30 seconds
< 2.7 bar 30 seconds
120 seconds
.
4
3.7.3 Test disconnection alarm
1. Open patient valve outlet.
Requirement:
the message “Check ventilation system and settings!”.
The disconnection alarm must be triggered after 2 ventilation operations. The device issues
3.7.4 Test pressure alarm
1. Shut off pressurized gas connection of device (2.7 - 6.0 bar).
Requirement:
The pressure alarm must be triggered. The device issues the message “Check pressure hose
system and gas supply!”.
3.7.5 Test demand mode LED
1. Open compressed air supply.
2. Select “Demand flow” setting.
Requirement:
Demand mode LED must come on (flicker).
3.7.6 Test audio response
1. Turn knob back to the “Ventilation” range. The device issues the message “Ventilation pressure limit
20 mbar”.
2. Select “Demand flow” setting.
Requirement:
After the test
3. Switch off device
4. Close oxygen cylinder.
5. Disconnect pressurized gas supply from device.
The audio response must be clear and intelligible.
Final check
3.8 Battery voltage
3.8.1 3.0 V battery (board)
As the 3.0 V lithium cell is hard to reach, its charge status can be called up both via the interface and via
a corresponding menu.
1. Switch on device and simultaneously keep the alarm mute key depressed.
The device is in battery control mode for 3 seconds and then switches to normal operating mode.
Within these 3 seconds, the “Energy supply” alarm in the alarm field comes on and the measured
voltage value of the lithium cell is displayed in the pressure bar graph.
In the table you will find an assignment of bar graph values to battery voltage values.
Bar graph value (mbar) Battery voltage (V)
60 3.21
55 3.19
50 3.17
45 3.15
40 3.13
35 3.11
30 3.09
25 3.07
20 3.05
15 3.03
10 3.01
5 2.99
0 2.97
Requirement: Measured value 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.
2. Switch off device.
3.8.2 3.6 V battery (battery compartment)
1. Open battery compartment with a screwdriver.
2. Remove 3.6 V battery from battery compartment.
3. Measure voltage using a digital multimeter.
Requirement: Measured value for 3.6 V battery is in the range 3.4 to 3.7 V.
4. Put battery 27 back in device correctly.
5. Close battery compartment.
Final check 17
3.9 Function check of frequency setting
AT
CPR
0,9
10
11
Patient valve with
patient circuit
Orifice 10 mbar
Flow meter
1. Provide a pressurized gas supply to MEDUMAT Easy CPR and to the flow meter.
2. Open oxygen cylinder.
open
3. Switch on device.
4. Connect ventilation tube to 10 mbar orifice and to flow meter.
5. Operate device at setting freq. = 14 min-1 and Vt = 1.1 l.
Requirement: Frequency must be 14 ± 2 min
-1
.
6. Operate device at setting freq. = 10 min-1 and Vt = 1.1 l.
Requirement: Frequency must be 10 ± 2 min
-1
.
7. Operate device at setting freq. = 30 min-1 and Vt = 0.1 l.
Requirement: Frequency must be 30 ± 2 min
-1
.
8. Switch off device.
9. Close oxygen cylinder.
10. Disconnect pressurized gas supply from device.
18 Final check
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