Stephan Ventilator ABV Service manual V1.1

Ventilator ABV – A - U

MAX.DRUCK

mbar

60

10

55

15
20

50

IPPV

45

25

303540

MIN.DRUCK

mbar

25

5

20 10

15

SENSITIVITÄT

P mbar

MANUELL

RESPIRATOR

EIN / A U S

MANUAL

RESPIRATOR

max.

EXPIRATION (mbar)

max.min.

mbar

IN S P IR ATIO N (m bar )

min.

ATEMZEITVERHÄLTNIS

IN S P.: EX SP.

1:4

1:3

1:2

7

8
9

10

12

2:1

1, 5 : 1

1:1

1:1,5

606

50

40

30

25

20

14

16

2 min

Service Manual

. STEPHAN GmbH · Medizintechnik · D-56412 Gackenbach · Kirchstr. 19 · Tel. [phone] · Fax [phone] · [e-mail] ·

www.stephan-gmbh.com

ABV – A - U Service - Manual Page 2

Contens

1. DESCRIPTION OF CONSTRUCTION AND FUNCTION 4

1.1 Complete scheme 4

1.2 Respirator with patient unit 5
Only ABV-U 5

1.3 Adjustment of parameters at the respirator 6

1.3.1 Change of inspiration flow at the flow-control valve 6

1.3.2 Frequency adjustment 6

1.3.3 Breathing/time ratio (inspiration/expiration) 6

1.3.4 Pressure monitor 6

1.3.5 Control limit-value IPPB 7

1.4 Patient component ABV-A 8

1.4.1 PEEP-adjustment 8

1.4.2 PLATEAU adjustment 8

1.4.3 Change lever Respirator / manual 8

1.4.4 Ejektor / GAS EVAC 8

1.5 Patient unit for paediatric respiration 8

2. FUNCTION SCHEME 9

2.1 Technical course of events during inspiration 9

2.2 Technical course of events during expiration 10

3. SERVICING OF BASIC APPARATUS 11

3.1 Electronic 11

3.2 Pneumatic 12

4. SIGHT CHECK 12

5. PERFORMANCE CHECK 12

5.1 Self-test of respirator 12

5.2 Errorcodes / Operation - Display 13

5.3. Operating mode CMV 13

5.4 Operating mode IPPV 14

5.5 Pressure alarms 14

6. CHECK OF ELECTRICAL SAFETY (STK) 15

7. PATIENT UNIT ABV-A 16

ABV – A - U Service - Manual Page 3

8. CLEANING & STERILISATION 17

8.1 Ventilator ABV-A 17

8.2 Patient unit 17

9. ERROR-FLOW DIAGRAM 19

9.1 Respirator 19

9.2 Pressure monitor 19

10. SPECIFICATION SHEET 20

10.1 Ventilator module ABV - A 20

10.2 Patient component 21

11. SPARE - PART - LIST 22

12. MAINTENANCE 23

ABV – A - U Service - Manual Page 4

1. Description of construction and function

1.1 Complete scheme

The respirator module is equipped with a pneumatic and with an electronic control unit
(respirator ABV-A and patient unit), and with an electronic control monitor for breathing
pressure.

The electronic of the respirator module is supplied with line voltage (230V/50 c.p.s.), while
the pneumatic unit requires a propellant gas in form of compressed air (3 - 5 bar). The
respirator ABV-A is designed for the anaesthesia respiration of children and adults in a semi­closed system.

The patient unit can be exchanged quickly due to its quick-release fastener and meets the
highest requirements for hygiene because of its easy dismountability (partly autoclavable with
a temperature of up to 134°C).

General description

The respirator ABV-A has to be supplied with compressed air as propellant gas with a
pressure of 3 - 5 bar (1). The various respiration parameters can be adjusted at the respirator:

ATEMZEITVERHÄLTNIS

INS P .: EXS P.

RESPIRATOR

EIN / A US

5

MANUAL

EXPIRATION (mbar)

MANUELL

RESPIRATOR

max.

INS P IR ATIO N ( m b a r )

max.min.

mbar

1:4

2:1

1:3

1, 5 : 1

1:1

1:2

1:1,5

606

7

50

8

40

9

30

10

25

12

20

14

16

min.

3 2 4

MAX.DRUCK

mbar

60

10

55

15
20

50

IPPV

45

25

303540

MIN.DRUCK

mbar

25

20 10

15

SE N SIT IV ITÄ T

P mbar

5

2 min

7

6

- breathing/time ratio (2)

- frequency (3)

- Min. / Max. Pressure / Sensitivity(4)

- volume (5)

- PEEP (6)

- PLATEAU (7)

ABV – A - U Service - Manual Page 5

1.2 Respirator with patient unit

The respirator ABV-A is designed for controlled anaesthesia respiration with state-of-the-art
technology.
The respirator works in a pressure-gas driven, timed and volume-constant way, with the
possibility to limitate the inspiration pressure at the patient unit.
The patient unit is designed according to the "bag-in-bottle-principle", thus achieving a
separation of breathing gas and control gas. In addition, the patient unit serves as reservoir.

ATEMZEITVERHÄLTNIS

1

RESPIRA TOR

EIN / A U S

2

MANUAL

EXPIRATION (mbar)

MANUELL

RESPIRATOR

max.

INS PIR AT IO N (m b ar)

max.min.

mbar

min.

INSP.: EXSP.

1:4

2:1

1:3

1, 5 : 1

1:2

1:1

1:1,5

606

7

50

8

40

9

30

10

25

12

20

14

16

3 4 8

MAX.DRUCK

mbar

60

10

55

15
20

50

IPPV

45

25

303540

MIN.DRUCK

mbar

25

20 10

15

SENSITIVITÄT

P mbar

5

2 min

On the upper left side of the

6

respirator You find the ON/OFF­switch (1).

7

Directly below You find the

12

flow-control valve (2), where the
volume flowing to the patient's
lungs during inspiration can be
dosified.

5

The number of respiration cycles
can be varied from 6 to 60
breaths per minute at the

11

potentiometer "frequency"(3),
while the ratio of inspiration and

10

9

expiration can be preselected
from 1 : 4 to 2 : 1 with the switch
"breathing/time ratio"(4).
An excess-pressure proof
respiration manometer (5)
indicates the pressure in the
system within a range from -10 -

60 millibar. The patient pressure
can be controlled by setting of pressure alarm limits . Max.-pressure (6) and min.- pressure
(7) can be varied with potentiometers. In the case of exceeding the alarmlimits an optical
and visual (8) alarm is released.
In the event of a power outage, an acoustic signal sets off a warning for at least 30 sec. With
the change lever (9) of the patient unit, either respirator respiration or manual respiration can
be selected.
The PEEP-valve (10) serves to increase the pressure at the end of expiration to a maximum of
10 millibar. With the use of the plateau valve (11), You achieve a respiration with a constant
upper pressure limited to a maximum of 60 millibar.

Only ABV-U

The respirator ABV-U can support spontaneouse ventilation of a patient. For that reasons is
an additional membran key („assist.-control“) on the frontplate. The trigger sensitivity can be
adjusted with the potentiometer „Sensitivity“ (12).

ABV – A - U Service - Manual Page 6

1.3 Adjustment of parameters at the respirator

1.3.1 Change of inspiration flow at the flow-control valve

In principle, it is possible to vary the inspiration flow at the flow-control valve in order to
reach a tidal volume of 0 - 1500 ml. In relation with the plateau pressure however, certain
respiration curves can be generated.

1.3.2 Frequency adjustment

The frequency (breaths per minute) can be adjusted for values between 6 and 60 breaths per
minute.
When adjusting the frequency, take into account, that with an increased frequency the breath
minute-volume remains constant, but that the tidal volume will be reduced.

1.3.3 Breathing/time ratio (inspiration/expiration)

The breathing/time ratio, the ratio of inspiration and expiration, can be preselected from
1 : 4 to 2 : 1 as the case might require, without influencing the respiration frequency.

1.3.4 Pressure monitor

The pressure monitor is an electronic module separated in two pressure-measurement ranges,
for the continuous control of the pressure the patient is subject to. The patientpressure is also
shown on the pressuregauge in the frontpanel of the ventilator.

Maximum pressure

The pressure-measurement range for the maximum pressure has a potentiometer which is to
be used to smoothly adjust the upper respiration-pressure limit for values between 6 and 60
millibar.
In the event, that the pressure for the patient exceeds the adjusted maximum pressure, the
pressure monitor sets off an optical and acoustic alarm until this pressure is no longer
exceeded.

Minimum pressure- or disconnection unit

The pressure-measurement range for the minimum pressure has a potentiometer, which is to
be used to smoothly adjust the minimum respiration-pressure limit-value for values between 5
and 25 millibar.
During one respiration cycle, the adjusted minimum-pressure limit-value has to be exceeded
once and fallen short of once, if this is not the case, an optical and acoustic alarm is set off.

Flashing red: minimum-limit pressure-value permanently exceeded (Stenosis or PEEP to
high), or value permanently not reached (disconnection).
In the event of an existing disconnection inside the system followed by a considerable
pressure drop, the disconnection warning is set off with a delay of 15 seconds.

ABV – A - U Service - Manual Page 7

By pressing the STAND-BY foil button of the pressure monitor, the acoustic alarm can be
suppressed for 2 minutes.
The pressure monitor is to be set in operation with the operating switch of the respirator.
In case of an artificial respiration without the respirator, the pressure monitor is not working.

1.3.5 Control limit-value IPPB

As an option, with this respirator model a pressure-controlled respiration (IPPB) can be
carried out. For this kind of artificial respiration, expiration is induced when a preselected
maximum pressure is reached.
For this purpose, the excess-pressure limit value of the integrated pressure monitor serves as
pressure control.
The next inspiration cycle then will be set off by the time determined by the frequency.

Respirator "ABV-U"

In order to be able to work more successful in cases where the spontaneous respiration of the
patient has not yet failed completely or is showing signs of coming back, we offer a "ABV-U"
put-in respirator with integrated pressure monitor for assisted/controlled or pressure­controlled respiration.
Caused by the inspiration efforts of the patient, a below atmospheric pressure is generated
inside the system, causing the respirator to carry out an additional and completely controlled
respiration lift in accordance with the preselected respiration parameters.
In the event, that the spontaneous respiration of the patient ceases completely, the respiration
frequency will be reduced to the preselected values and controlled respiration will be
continued automatically.
The suction, that has to be generated by the patient to trigger respiration in this mode, can be
varied with a sensitivity of 0.2 - 2 millibar of pressure difference at the adjusting knob for
sensitivity.
In the event, that the respirator is operated with a positive pressure at the end of expiration,
the trigger level is adapted to this value automatically.