Weinmann WM 28000 Service Manual

MEDUMAT Easy
Ventilator
WM 28000
Contents
Introduction
1.
Overview
1.1
2.
Description
2.1
2.2
2.3
2.4
2.5
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
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Special symbols on the ventilator
. . . . . . . . . . . . . . . . . . . . . . . . . .
Uses
. . . . . . . . . . . . . . . . . . . . . . . . .
Ventilation function Demandflow function Patient valve Audio response
. . . . . . . . . . . . . . . . . . . . . . . . . .
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
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breath volume
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10 10 11 12
12 13 13
13 13 14 14
3
4
5
6
6 6 7 7 7
8
8 8 8 9 9
9
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
7.
Spare parts
7.1
7.2
8.
Tools and Test Equipment
8.1
8.2
8.3 Testing equipment. . . . . . . . . . . . . . . 39
9. Technical data . . . . . . . . . . . . . . . . . . . . . . . 40
9.1 Pneumatic / electronic systems . . . . . . 41
10. Technical Changes . . . . . . . . . . . . . . . . . . . 42
11. Repair and service records . . . . . . . . . . . . . . 43
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Intervals and scope Batteries Storage
General Changing the filter in the pressurised
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
Spare parts list Service sets
General tools Special tools
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30 31 32 33
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35 37
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38 38
© Copyright WEINMANN GmbH & Co. KG. 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.
2

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 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
Introduction 3

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
D
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M
sy
a
E
is
s
o
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t
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io
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,7
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<
12
14
12
15
13
16
14
-
d
n
a
m
e
D
w
lo
f
-1
)
in
m
)
60
50
40
30
20
10
0
T
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U
D
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M
sy
a
E
is
s
o
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t
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a
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is
mb
D
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2
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a
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7
,
2
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12 1
1
4
1
12
10
9
15
3
10
1
6
1
14
1
1
7
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m
e
D
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16
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30
5
1
-
)
n
i
m
(
.
eq
Fr
3
)
n
i
m
/
l
(
V
M
11 Battery compartment
12 Speaker
13 Pressure gauge hose
connection
14 Ventilation hose connection
4 Overview

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
i
t
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s
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D
O
2
r
a
60
b
7
,
2
<
50
40
30
20
12
11
10
14
12
10
9
15
0
10
13
16
14
11
7
-
d
n
a
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16
f
30
5
1
-
)
n
i
m
(
.
q
e
r
F
3
)
n
i
m
/
l
(
V
M
Inlet 2,7 - 6 bar O2.
T
A
UM
ED
M Easy
e
t u a
h
n
o i s
s e r
e
s
P
s a
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Ty
o
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:
s e r
P
mbar
O
2
r
0
a
6
b
,7
2
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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
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.
Overview 5

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.
6 Description
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
40 34 35 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).
Description 7

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.
3. Device setting: Freq. = 30 min-1, MV = 3 l/min.
4. Language setting “English”.

3.3 Entering the device data

Enter the device number and the tester number in the test record.
8 Final check

3.4 Testing for leaks and pressure reading

3.4.1 Checking input side for leaks

With the device switched off, apply 6 bar pressure to input side and and shut off output pressure.
Requirement: The pressure drop must be less than 0.2 bar/min.

3.4.2 Checking pressure measurement zone for leaks

Apply 55 mbar ± 2 mbar to MEDUMAT pressure measurement zone.
Requirement: The pressure drop must be
2 mbar/min.
Respiration
T
A
M
U
D
E
M
sy
Ea
s i s
o
n
e
t
n
S
o i t
c
e n n
o
c
r
s
a
i
b
D
m
2
0
6
< 2,7 bar O
0
5
0
4
30
0
2
2
1 1
1
0
4
1
1
2
1
0
1
9
15
0
0
3
1
1
6
1
4
1 1
1
7
16
30
5
3
Test pressure gauge
13
pressure indicator
Syringe

3.5 Self-test when device is switched on

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 check 9

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)
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
10 Final 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 check 11

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.
12 Final 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 check 13

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.
14 Final 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);
Check system components: carrying platforms, oxygen fittings, secretion suction system, hose connections etc.;
Check test bag;
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.
Servicing 15
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