HEYER Modular Operating Manual Rev 1.1 July 2007

HEYER Modular

Table of contents 1 2

Details of the Manufacturer... 5 Description and Utilization of the Apparatus ... 6 2.1 General ... 6 2.1.1 Introduction ... 6 2.1.2 Intended purpose... 6 2.1.3 Product improvements... 6 2.1.4 Responsibility of the operating personnel... 6 2.1.5 Liability of the manufacturer... 7 2.2 General precautionary measures... 7 2.2.1 Warning directions ... 7 2.2.2 Precautionary measures... 8 3 Functional description... 8 3.1 Anesthesia ventilator... 8 3.1.1 Fresh gas decoupling ... 8 3.1.2 Constant volume provided by machine-controlled ventilation ... 8 3.1.3 Compliance compensation ... 9 3.1.4 Bag-in-Bottle System ... 9 3.2 Fresh gas dosing... 9 3.3 Vaporizer Mounting Device and Vaporizer ... 9 3.4 Patient module ... 10 3.4.1 Circuit Absorber System ... 10 3.4.2 CO2 absorber ... 10 3.4.3 Reservoir and Manual Ventilation Bag ... 10 3.4.4 Volume Measurement... 10 3.4.5 Oxygen Measurement ... 10 3.4.6 Patient module heating ... 10 3.5 Touch Screen Display... 11 3.5.1 Symbol Description... 11 4 Operating Elements / Device Connections... 12 4.1 Views of Apparatus ... 12 4.1.1 Front view / left-hand side view ... 12 4.1.2 Rear view / right-hand side view... 12 4.2 Ventilation unit... 13 4.2.1 "Ventilation Mode"- selector switch... 14 4.3 Flowmeter tube block with fresh gas dosing... 14 4.4 Vaporizer Mount... 15 4.5 Patient module (circle system)... 16 4.6 IR adapter ... 17 4.7 Compressed air injector for bronchial suction (optional) ... 17 4.8 Symbols on the apparatus ... 17 5 Alarm Messages and Safety Devices ... 18 5.1 Alarm Messages and ... 19 Corrective Measures... 19 5.1.1 Alarm messages during the compliance test... 24 5.1.2 Alarm messages during the system test... 26 5.1.3 Alarm messages in normal mode ... 27 5.1.4 Alarm message “Technical fault” ... 31 5.2 Test of alarm functions... 31 6 Start-up and functional test ... 32 6.1 Preparing for Operation ... 32 6.2 Pre-Operation Tests... 32 6.2.1 Compliance test ... 33 6.2.2 O2 Sensor Calibration ... 33 6.2.3 Leak test fresh gas system ... 34 7 Operation in the Individual Functions... 36 7.1 Standby Mode ... 36 7.1.1 The Options Window in Standby Mode ... 36 7.2 “Manual/Spontaneous” ventilation mode ... 36 7.2.1 Setting Alarm Limits in “Manual/Spontaneous” mode ... 36

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HEYER Modular

7.3 CMV Ventilation Mode ... 37 7.3.1 CMV Ventilation Mode ... 37 7.3.2 Setting Alarm Limits in CMV mode ... 38 7.4 PVC Ventilation Mode... 38 7.4.1 PCV Ventilation Mode... 39 7.4.2 Setting Alarm Limits in PCV mode... 39 8 Alarm Elimination... 40 9 Dismantling and Reassembling... 41 9.1 The Patient Module... 41 9.1.1 The CO2 absorber... 41 9.1.2 The Bag-in-Bottle System... 41 9.1.3 Exchanging the Expiratory Flow Sensor... 41 9.1.4 Dismantling the ventilation pressure valve ... 42 9.1.5 Replacing the control membranes ... 42 9.2 The Valves (expirations, inspiration and emergency air valve) ... 42 9.3 Installing the Vaporizers... 43 10 Cleaning ... 43 10.1 Cleaning the housing... 44 10.2 The Patient Module ... 44 11 Service and Maintenance ... 44 11.1 General... 44 11.2 Maintenance Work ... 44 11.2.1 Maintenance work on the ventilator / patient module ... 44 11.2.2 Maintenance work by a qualified technician ... 44 11.2.3 Maintenance work after 1000 operating hours ... 45 11.2.4 Maintenance work after 2000 operating hours ... 45 11.3 Maintenance work on the vaporizer ... 45 11.4 Other maintenance work ... 45 12 Technical data ... 46 13 Warranty... 48

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HEYER Modular, Operator’s manual

Rev. 1.1 - 07/07

HEYER Modular

1

Details of the Manufacturer Apparatus:

Anesthesia System HEYER Modular

Manufacturer:

HEYER Medical AG Carl-Heyer-Straße 1-3 D-56130 Bad Ems Germany Tel.: +49 (0) 2603 / 791-3 Fax: +49 (0) 2603 / 70424 E-Mail: [email protected] Internet: http://www.heyermedical.de

Subject to alterations, issued July 2007.

Rev. 1.1 – 07/07

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HEYER Modular

2

Description and Utilization of the Apparatus

2.1

General

2.1.1

2.1.2

Introduction

The HEYER Modular anesthesia system represents a flexible anesthesia workplace for implementing and monitoring inhalation anesthesia in the half-closed system and the nearly closed system for low-flow techniques with minimum gas and anesthetic agent utilization. During the development of the system special emphasis was placed on the ergonomic design and consequently the safe and easily learnable operation. Furthermore the excellent airtightness of the system ensures the economical daily high and low pressure utilization. The standard model contains the following system components: A. Electronic ventilator: The processor-controlled ventilator allows constant-volume ventilation for all patient groups with a body weight of 3 kg upwards. Due to the system compliance compensation, even small tidal volumes can be precisely administered. The ventilation type CMV as the standard and PCV as the optional ventilation type as well as considerable variation options of the artificial ventilation cycle facilitate secure ventilation for complicated lung conditions. A comprehensive test and alarm management ensures the required safety for patients and prevents out-of-control operating conditions. The clear design of the user interface and the display allow the secure operation and a quick detection of the selected ventilation parameters. B. Patient module The circular patient absorber system is highly integrated and compacted in an aluminum block. This block is tempered to prevent the formation of condensation. It also contains a monitored emergency air valve, a fresh gas reservoir in form of a hand-held anesthesia bag and an expiratory flow sensor. All sensors are continuously monitored during operation. The sensors are automatically calibrated during the start-up of the apparatus. C. Integrated fresh gas dosing system including vaporizer unit: The flowmeter tube block contains all mandatory safety equipment as well as a pneumatic regulation system to maintain a

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minimum oxygen concentration of 25% in the fresh gas flow (ratio system). Intended purpose

The Heyer Modular anesthesia system is suitable to make available anesthetic gases and to perform automatic or spontaneous/manual ventilation with a circular system in a semi-closed system. This procedure can be used on adults as well as children. The use of an open system to anesthetize small children and newborns is possible. The Modular anesthetic system is intended for use in operating rooms in clinics and mobile doctor’s practices. It is not suitable for use in the vicinity of MRI scanners. Possible anesthetic procedures that are supported by automatic or manual artificial ventilation are: - Full anesthetic with volatile anesthetic agents - Full anesthetic with balanced anesthesia - Full anesthetic with intravenously applied anesthetic agents - Partial anesthetic 2.1.3

Product improvements

HEYER Medical AG reserves the right to make changes and/or to revise devices and/or operating instructions without prior notice. These instructions deal with all the characteristics of the anesthetic system HEYER Modular according to the state of information at the time of going to print. Instructions and devices created or manufactured at a later date may already include improvements or changes not featured in earlier models. 2.1.4

Responsibility of the operating personnel

The proper functioning of the anesthetic system HEYER Modular is only warranted if the apparatus is used and maintained n accordance with the directions provided by the manufacturer. Not observing these instructions will void any warranty claims with regard to HEYER Medical AG. ATTENTION: Before using the apparatus, please read the operating instructions, as well as the section “General precautionary measures” and observe in particular all directions in these instructions that are titled ATTENTION or WARNING. These instructions merely describe the operation of the device. A qualified professional can find instructions regarding maintenance and repair in the SERVICE INSTRUCTIONS HEYER MODULAR.

HEYER Modular, Operator’s manual

Rev. 1.1 - 07/07

HEYER Modular

The device may only be operated by qualified, trained professional personnel. Prerequisite for this is the unlimited observance of these operating instructions and/or additional accompanying documents and manufacturer’s indications, as well as the adherence to the general precautionary measures listed in the following, and the briefing by authorized medical product consultants. Additional gas monitoring is prescribed to operate the device. The following conditions must be met at a minimum (DIN EN 740): At least the following are to be monitored: • concentration of the anesthetic gas • concentration of carbon dioxide For these additional monitoring parameters, it must be possible to set upper and lower alarm limits. When reaching one of these upper or lower alarm limits, a visual or acoustic alarm needs to be activated. The measuring adapter to be inserted into the circle system or patient’s tube system must be equipped with ISO cones (DIN EN 740). This is to be applied at the inspiration tube connection or ideally the Y-piece. Measurement close to the tube is recommended, however, since this makes the collection of inspiratory and expiratory gas values possible. Monitors that work using the sidestream procedure should definitely be preferred in order to complement the additionally required gas monitoring. In case a device should not work as described in these instructions, the device in question may not be used until the fault is eliminated. The operating personnel carry the responsibility for damages and injuries whose causes can be traced back to the improper operation and/or repair/maintenance of the device by unauthorized persons. 2.1.5

Liability of the manufacturer

The HEYER Medical AG is only liable for the safety, reliability and functionality of the device if: - the device was operated corresponding to the directions provided by the manufacturer. - additions, new settings, changes or repairs were carried out by professionals qualified by the manufacturer. - the device and was only operated in buildings with facilities for protective grounding in compliance with the regulations of the IEC.

Rev. 1.1 – 07/07

2.2 2.2.1

General precautionary measures Warning directions

Avoiding potentially dangerous situations in which an injury to the patient and/or the operating personnel cannot be excluded. Carry out the tests listed on the checklist daily and in case of any fault that occurs do not use the system until the fault has been eliminated. Always connect the output of the ventilation pressure valve for gas overflow with the anesthetic gas ongoing flow installation, usually installed in operating rooms. The patient should also be observed closely by qualified professional personnel. In certain situations, life-threatening circumstances may occur that don’t necessarily trigger an alarm. Always set the alarm limits so that the alarm is triggered before a hazardous situation occurs. Incorrectly set alarm limits may result in operating personnel not being aware of drastic changes in the patient’s condition. In order to prevent an electric shock, the apparatus (protection class I) may only be connected to a correctly grounded mains connection (socket outlet with grounding contact). Danger of explosion! The device may not be operated in the immediate vicinity of flammable anesthetics of other flammable substances. The use of flammable anesthetics (e.g. ether, cyclopropane) is not permitted. Since this device is not permitted for use with flammable anesthetics (e.g. ether, cyclopropane), the use of antistatic breathing hoses and facemasks is not required (DIN EN 740). Electric shock and fire hazard! Always switch off the apparatus and disconnect it from the mains before cleaning. Fire hazard! The fuses (e.g. the additional sockets) may only be replaced by fuses of the same type and with the same fuse value. Electric shock hazard! The device may only be opened by qualified or authorized professional personnel. In case of a failure of the protective conductor the connection of the apparatus via the additional socket may lead to a discharge current exceeding the permissible values. Ambient interference caused by electromagnetic radiation exceeding the specifications of EN 60601-1-2 can influence machine functions.

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HEYER Modular

2.2.2

Precautionary measures

Avoid situations in which the device may malfunction or be damaged. This device may only be operated by trained professional medical personnel. Before putting the device into service, the operating personnel must be familiar with the directions and information in these instructions and must have been briefed by a medical product consultant. If the apparatus does not function as described, it must be examined and possibly repaired by qualified service personnel before being used again. Treat the device with care in order to avoid damages and faults in its functionality. Always make sure that the device is supplied with gas in a way that conforms to the technical specifications. Before operating the device, it must be properly calibrated and the corresponding device tests need to be carried out, as described in these instructions. Should the device display any functional faults during the calibration and tests prior to operation, it may not be operated until the faults have been eliminated by a qualified professional. After any maintenance tasks, a function test and the compliance and system tests need to be carried out before the device is put into clinical use. Only bacteriological filters with a low flow resistance must be connected to the patient module and/or patient connection.

3

Functional Description

3.1

Anesthesia ventilator

Ventilators are described according to the principle of controlling the change over from inspiration to expiration. The HEYER Modular apparatus offers the following characteristics I the controlled ventilation mode or so-called CMV mode (Controlled Mandatory Ventilation). - time-controlled: The timely sequence of inspiration and expiration has been specified by the ventilation frequency settings. The ration of the inspiration to the expiration time of the individual ventilation cycle is determined by the adjustable I/E ratio. - pressure-limited: The tidal volume during a controlled ventilation is supplied during the entire period if the inspiratory flow and can be set as a ventilation

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parameter. The inspiration is, however, terminated before the tidal volume has been administered once the measured airway pressure reaches the set peak pressure alarm limit. - constant-volume: The inspiratory flow to the patient required for a ventilation with the set parameters frequency f, tidal volume Vt and ventilation time ratio I/E, is automatically calculated by the ventilator. This inspiratory flow is generated via the drive gas for the patient module. In standard anesthesia ventilators deviations in the tidal volumes actually administered to the patient could occur due to the respective fresh gas setting and system compliance of the ventilation system. The ventilator of the HEYER Modular apparatus supplies a constant volume, as on the one hand the patient module is uncoupled from the fresh gas system. On the other hand the system compliance of the patient module is automatically taken into consideration by the ventilator when generating the breathing volume. 3.1.1

Fresh gas decoupling

During fresh gas decoupling in CMV mode, the fresh gas flow is directed into the manual ventilation bag. The manual ventilation bag thus serves as a fresh gas reservoir. This principle offers the following advantages for machine-controlled ventilation: 1. The tidal volume is completely independent from the set fresh gas flow. This ventilation is therefore referred to as constant volume ventilation. 2. The fresh gas flow can be maintained at a very low level, e.g. below 500 ml/min, depending on the patient. The manual ventilation bag serves as a fresh gas reservoir for the fresh gas administered during inspiration. The entire fresh gas volume is available during the next inspiration, i.e. not only the fresh gas stored in the reservoir but also the fresh gas supplied during expiration. 3.1.2

Constant volume provided by machine-controlled ventilation

During controlled CMV ventilation, the set tidal volume is administered irrespective of the pulmonary circumstances. In principle the ventilator drive represents a constant flow generator. The inspiratory flow of the ventilation gas is automatically adapted to the respective settings of the tidal volume Vt, the ventilation frequency rate f and the ventilation time ratio I/E.

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3.1.3

Compliance compensation

The administered tidal volume is corrected to the target value set by the user with the aid of the compliance compensation. The system compliance of each ventilation system i.e. the compliance of patient hoses and the patient module itself always leads to losses in the administered tidal volume. In the case of the HEYER Modular, a control loop can correct this volume loss as an automatic compensation function. For this purpose several ventilation cycles are required. The drive gas flow is then increased to just above the normal values, i.e. values to achieve the set ventilation volume. The correct tidal volume is, however, administered to the patient, while the slightly higher volume is absorbed by the system compliance due to the effective compliance compensation. 3.1.4

Bag-in-Bottle System

The so-called Bag-In-Bottle system is part of the patient section or circuit system. The gasconducting sections are divided from the ventilator into a primary (ventilator) and a secondary circuit (patient). The gas volume provided by the drive is not directly administered to the patient but instead compresses a bellows inside a pressure dome. As a result the ventilation gas contained in the bellows is administered to the patient. The larger the drive volume flowing into the pressure dome, the greater the tidal volume will be. Once the drive gas flow has finished the pressure compensation between the primary and secondary circuit is also ended. A distinctive plateau in the ventilation pressure curve is formed if the system does not switch over to the expiration directly after the end of the inspiratory gas flow. For this purpose the drive volume contained ion the pressure dome us maintained at a steady level for some time. The bellows are suitable for adults and children. An exchange of the bellows for different patient groups is not necessary.

3.2

Fresh gas dosing

The adjustment of the amounts of gas delivered to the patient is handled at the measuring tube block. It contains flow measurement tubes, also described as rotameters. These measuring tubes consist of a vertically aligned glass tube with a floating element inside. Since the glass tube widens toward the top, a certain flow of gas will lift the floating element to a corresponding height. Adjusting the gas flow is handled by valve spindles inside the respective measuring tubes.

Rev. 1.1 – 07/07

The choice between a setting of gas types O2/AIR and/or O2/N2O is made via a changeover switch, which opens the respective gas line to the measuring tube block. The fresh gas cannot be set with a mixture of AIR and N2O as in this case a decrease of the oxygen content to below 21% could not be avoided. Reducing the oxygen content to less than 21% is theoretically also possible when dosing the O2 and N2O gases. Such unfavorable settings are prevented by a pneumatic safety system. This mechanism, also described as the “Ratio system”, ensures a steadily present minimum content of 25% O2 along with the N2O in the gas mix dosage. When raising the flow of N2O, the required flow of O2 is also raised automatically. The fresh gas thus adjusted will be fed to the vaporizer automatically and mixed with the anesthetic there.

3.3

Vaporizer mounting device and vaporizer

The appliance contains a Selectatec® compatible vaporizer mounting device (standard configuration) for two vaporizers. The vaporizer has a chamber, which contains the anesthetic in liquid form in its lower part. A wick made of metal mesh enriches the upper part of the chamber with saturated vapors of the anesthetic. The concentration of the saturated vapor at room temperature is much higher than is clinically justifiable. A suitable mixing ratio of the gas with anesthetic with a flow of gas passing by this chamber can lead to the desired concentration. This is handled by the adjusting wheel. This adjusts the ratio of the streams of carrier gas via a bypass channel and through the vaporizer chamber in such a way that the desired concentration is attained at the vaporizer outlet. In the zero position of the vaporizer this bypass channel remains open, while the vaporizer chamber is completely closed off to the flow of gas. The anesthetic vapor concentration in the vaporizer chamber may be saturated, but the absolute content of anesthetic is still dependent on temperature. This is why there is a temperature compensation valve in the bypass channel, which in the case of vapor pressure changes caused by temperature fluctuations changes the set dilution ratio in such a way that a temperature-independent concentration output of the anesthetic is warranted. For additional indications see: Operating instructions of the anesthetic vaporizer used.

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3.4 3.4.1

3.4.5

Patient module Circuit absorber system

A circuit absorber system is a ventilation system with a CO2 absorber. This system allows anesthetics to be carried out at extremely low fresh gas settings. The ventilation gas contains various parts of rebreathing gas i.e. expiratory gas freed from CO2 parts. This is achieved with a circuit ventilation system facilitating a re-breathing of the expiratory CO2-containing gas. A circuit system with high re-breathing contents causes a reduction of the consumption of anesthetic gases. This type of system also offers an improved breathing gas conditioning. The patient module is designed as a circuit absorber system in the form of a compact aluminum block. The hose connections normally required between the ventilator and the circuit system are thus no longer needed. 3.4.2

Oxygen measurement

Oxygen measurement is metered by a measuring cell installed on the inspiration valve. This single-cathode measuring cell, also referred to as a fuel cell, offers a longer service life compare to other oxygen cells and is less sensitive to existing anesthetic gases. 3.4.6

Patient module heating

The heating prevents the formation of condensation in the patient module and on the valve caps of the inspiration and expiration valve. The heating positively contributes to a ventilation gas conditioning. The heating mat also functions as a sealing mat and is installed between the top and bottom sections of the patient module. An electronic control integrated in the ventilator keeps the temperature of the patient module constant at approx. 36°C. An over-temperature protection protects the apparatus against overheating.

CO2 absorber

The absorber serves to absorb the breathing lime. It aims to remove the CO2 from the expiration air. The absorption process is a chemical reaction in which carbon dioxide is bound and most of the reaction water evaporates and the lime is removed. This is why used breathing lime is dry and hard. The lime must be hermetically sealed for storage in a cool and dry place so as not to become malabsorbant. 3.4.3

Reservoir and manual ventilation bag

The reservoir consisting of a manual ventilation bag serves as an inspiratory interim storage facility for the fresh gas. The reservoir pressure during machine and spontaneous ventilation is limited to 1-2 bar by the excess / ventilation pressure valve, also known as the overflow valve. This valve serves additionally for setting the desired ventilation pressure for manual ventilation. 3.4.4

Volume measurement

Volume measurement takes place by means of measuring the flow in the expiration branch using a flow sensor, which works according to the hot-wire anemometer principle. The ventilator processors integrate this measured value with the displayed tidal and ventilation minute volumes. The tidal volume shown in the display is a purely measured value. The tidal volume displayed during machine-controlled ventilation is measured by an internal flow sensor and is not dependent on the expiratory volume measurement.

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3.5

3.5.1

Touch screen display

Symbol description

The “Touch screen” display acts as the user interface for the HEYER Modular. With the exception of the ventilation mode dial, all data input is done via light finger pressure on the touch screen. Therefore it is no problem to operate the system with moist or dirty hands. To change a value, for instance, you press the corresponding symbol of the value you wish to change. The illumination of the selected symbol will then be intensified as confirmation. You can then increase or decrease the value using the arrow symbols. To confirm the data change, press the OK button.

Fig. 1 Touch Screen Display

P̂

Peak airway pressure in mbar

P

Mean airway pressure in mbar

MV

Minute volume in liters

FiO2

Inspiratory oxygen concentration

CMV PCV

CMV or PCV ventilation mode Mute switch for acoustic alarm signals Cursor for increase or decrease of set values

Confirmation of entered values OK PLAT. Plateau pressure in % of the inspiration time Positive Expiratory End Pressure

PEEP Inspiratory to expiratory ratio I:E Ventilation frequency f

Tidal volume in mL in CMV mode; Drive gas in l/min in PCV mode

SET OPT.

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Display change-over from measures values to SET values Alarm limits setting mode Options

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HEYER Modular

4

Operating Elements / Device Connections

4.1

Views of apparatus

4.1.1

Front view / left-hand side view

1 Vaporizer mount

Selectatec® compatible vaporizer mount for two vaporizers (As an option, a single mount for Dräger vaporizers is available.)

2 Flowmeter block 5-fold flowmeter block with integrated ratio system, O2 bypass and N20/AIR changeover switch.

3 Ventilator unit Microprocessor-controlled ventilation unit with EL display

4 Patient module Absorber circuit system with integrated "Bag-in-Bottle" system, active and passive valves as well as APL ventilation pressure valve 5 Oxygen sensor with connecting cable

6 Mount for holding arm

Fig. 2 Front view

4.1.2

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Rear view / right-hand side view

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1 Mains cable Power supply cable for the connection of the apparatus to a socket with grounding contact.

2 Hook for cable winding 3 Additional sockets Other apparatus with a maximum power consumption of 3.5 A each can be connected to 2 additional sockets.

4 fuses (resetable) Over current triggering device 5A, 2 each for the ventilator, one for the backup battery for power supply in the event of a mains failure.

5 Reserve bottles – connections 6 Type plate with serial number 7 Fan for housing ventilation 8 Mains connection for the central gas supply With 3 manometers for pressure monitoring

9 Mains switch The apparatus is switched on/off via this switch and the supply of mains voltage is created. This switch stays in ON position during operation.

Fig. 3 Rear view

4.2

Rev. 1.1 – 07/07

Ventilation unit

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Fig. 4 Ventilator display and ventilation mode selector switch

The ventilator has a color LCD display (an EL display is optionally available. This highcontrast display allows a clear overview of the measured values and ventilator settings. A clear side read-off is possible. 4.2.1

"Ventilation Mode"- selector switch

The rotary switch for the selection of the ventilation mode has four positions: Standby: Position for the commissioning and implementation of compliance and system tests Manual/Spont: This position switches the ventilator to manual ventilation or spontaneous ventilation mode. CMV child: This position switches the ventilator to CMV mode for machine-controlled ventilation of children. CMV adult: This position switches the ventilator to CMV mode for machine-controlled ventilation of adults.

4.3

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Flowmeter tube block with fresh gas dosing

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1 Flowmeter tube O2 with low measuring range, for settings from 0 to 1000 ml/min 2 Flowmeter tube O2 with high measuring range, for settings from 1.5 to 10 l 3

Flowmeter tube AIR with low measuring range, for settings from 0 to 1000 ml/min

4

Flowmeter tube AIR with high measuring range, for settings from 1.5 to 10 l/min

5

Flowmeter tube N2Owith low measuring range, for settings from 0 to 1000 ml/min

6

Flowmeter tube N2O with high measuring range, for settings from 1.5 to 10 l/min

7

Valve spindle for O2 gas dosing

8

Valve spindle for AIR gas dosing

9

Valve spindle for N2O gas dosing

10 N2O/AIR change-over switch This switch allows the pre-selection of the gases N2O or AIR, which can subsequently be dosed with the respective valve spindles. The previously set volume flow is retained after switching back to the same gas type.

Fig. 5 Flowmeter tube block with fresh gas dosing

4.4

Vaporizer mount

1 Valve cartridge of vaporizer mount 2 Locking device 3 Stop buffer (support) for vaporizer

Fig. 6 Vaporizer mount

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4.5

Patient module (circle system)

Fig. 7 Patient module (circle system)

8

Outlet of the ventilation pressure valve Here the anesthetic gas suction unit is connected.

Inspiration valve

9

Connection for expiration hose

Ventilation pressure valve Including rotary regulator for setting the pressure control during manual ventilation or for setting it as an overflow valve for CMV or spontaneous ventilation.

10

Fresh gas outlet

11

O2 bypass The O2 bypass supplies a high flow of O2 (approx. 50 l/min) directly to the fresh gas outlet or to the patient module. When releasing the O2 bypass button, this returns to its original position and the O2 bypass is interrupted automatically.

1

Emergency air valve

2 3

4

Expiration valve

5

Oxygen measuring cell

6

Connection for inspiration hose

12

CO2 absorber

7

Hose connection for reservoir/ manual ventilation bag

13

Bellows with pressure dome

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4.6

IR adapter

1

IR adapter The optical infrared interface allows the connection of computers or monitoring systems.

1

Compressed air injector (drive for suction unit) Compressed air injector with vacuum display and vacuum regulating button.

2

Connection for vacuum hose Connection for hose to suction glass connection “vacuum”

Fig. 8 IR adapter

4.7

Compressed air injector for bronchial suction (optional)

Fig. 9 Suction

4.8

Symbols on the apparatus Caution! Please observe the following documentation

On / Off (connection to power supply)

IR adapter

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5

Alarm Messages and Safety Devices

The HEYER Modular anesthesia system shows alarm messages on the EL display during operation. The alarm message is displayed until the fault condition that triggered the alarm is resolved. High-priority alarms are display against a light background. Low-priority alarms are display against a dark background. The alarm indication on the display is not affected by pressing the mute button for the acoustic alarm. A bell will appear on the righthand side of the screen to indicate the acoustic alarm suppression. In the following information all alarms able to occur during the various operating statuses are explained.

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5.1

Alarm messages and corrective measures

Alarm message

Cause

Corrective Measures

Compliance test carried The initial compliance test was out carried out successfully.

The system is ready for operation.

Test passed Leak rate is more than 300 ml/min. Please check breathing circuit. Press OK to continue

The initial compliance test was The ventilator can be safely operated carried out successfully. Leak rate is with an adequate fresh gas flow. If between 300-600 ml/min . necessary repeat the compliance test in the OPTIONS menu after having tightened the cap nuts and correcting the hose connections.

Test passed Leak rate is more than 600 ml/min. Please check breathing circuit. Press OK to continue

The leak rate of the circuit and the patient hoses is greater than 600 ml/min at 40 Pa x 100.

The ventilator can be safely operated with an adequate fresh gas flow. If necessary repeat the compliance test in the OPTIONS menu after having tightened the cap nuts and correcting the hose connections.

ATTENTION! Use Manual ventilation mode only.

The compliance test was not carried out or not passed. Machinecontrolled ventilation is not possible until the compliance test has been passed.

Carry out the compliance test in the Standby/OPTIONS menu. If this is not successful, please call a service technician.

System Resistance too high.

The resistance of the ventilation hoses or the bacteriological filter is too high.

Renew the bacteriological filter and/or the ventilation hoses. Carry out the compliance test in the Standby/OPTIONS menu. If this is not successful, please call a service technician.

Compliance out of range.

The compliance of the connected ventilation hoses is outside the permissible range of 3.0 to 9.9 ml/mbar.

Remove the bacteriological filter and/or the ventilation hoses. Carry out the compliance test in the Standby/OPTIONS menu. If this is not successful, please call a service technician.

Leak test Complete The leak rate of the entire circuit Leak rate is higher than higher than 500 ml/min at 40 Pa x 500 ml/min. Verify that 100. APL is set to MAX position CO2 absorber, vaporizers locked.

The ventilator can be safely operated with an adequate fresh gas flow. If necessary repeat the compliance test in the OPTIONS menu after having tightened the cap nuts and correcting the hose connections to the vaporizer and absorber.

Leak test Complete The leak rate of the entire circuit Leak rate is higher than higher than 1,000 ml/min at 40 Pa x 1,000 ml/min. Verify that 100. APL Valve is set to MAX position CO2 absorber, vaporizers locked.

The ventilator can be safely operated with an adequate fresh gas flow. If necessary repeat the compliance test in the OPTIONS menu after having tightened the cap nuts and correcting the hose connections to the vaporizer and absorber.

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Alarm message

Cause

Corrective Measures

O2 Sensor Calibration Successful

O2 Calibration is OK.

System is ready for the FiO2 measurement.

O2 cell invalid. Press OK to start

The O2 call either has a concentration Expose O2 sensor with connected cable of <21% O2, is not connected or connection to room air with 21% O2 or faulty. replace.

O2 concentration too high. Expose Sensor to room air. Press OK to start

The O2 call either has a concentration Expose O2 sensor to room air with 21% of <21% O2, or is faulty. O2 or replace.

APNEA

The system is not measuring an expiratory volume of the patient.

Check the ventilation of the patient and the hose connections. The initial Apnea alarm tone can be selected between 15, 30 and 45 sec. A continuous tone sounds after 2 min Apnea.

Breathing Circuit Disconnection

No relevant pressure increase measured during ventilation.

Connect ventilation hoses.

Peak pressure greater than alarm limit

The peak pressure is higher than the Check the tidal volume setting, check set alarm limit Pmax . that Pmax is reached, the ventilator changes over to expiration and check the Pmax setting.

Peak pressure below alarm limit

The peak pressure is lower than the set alarm limit Pmax .

Check the tidal volume and/or plateau setting. Check the hose connections.

FiO2 lower than O2 min

The measured FiO2 value is lower than the set alarm limit FiO2 min.

Verify that the O2 supply is adequate and check the O2 alarm setting.

FiO2 greater than FiO2 alarm limit

The measured FiO2 value is higher than the set alarm limit FiO2 max.

Check the fresh gas composition and the O2 alarm setting.

Tidal volume lower than The measured Vt value is lower than Check the tidal volume setting and the Vt min the set alarm limit Vt min. Vt alarm setting. Check Vent Dial position.

The vent dial has been in a position that is not allowed for longer than 3 sec.

Minute volume below alarm limit

The measured minute volume value Check the ventilation parameters and is lower than the set alarm limit AMV the AMV min alarm setting. min.

PEEP greater than Pmin

The measured PEEP value is higher Check the correct APL valve and the than the set alarm limit Pmin. Pmin alarm setting.

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Turn the vent dial to a permissible position. Select a ventilation mode and re-start ventilation.

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Alarm message

Cause

Corrective Measures

PEEP greater than PEEP setting

The measured PEEP value is higher Check the correct APL valve setting. than the set PEEP value.

Unable to attain target pressure. Adjust flow or I:E ratio Set APL Valve to CMP/SP position

The inspiration time is too short and/or the drive gas flow is too low.

Check the settings of I:E, frequency and drive gas flow.

Reminder for the user that the APL valve must always be in CMV/SP position for machine-controlled ventilation. This message appears when the measured PEEP value is higher than the set PEEP value.

Set the APL valve to CMV/SP position if this is not already the case.

Ambient air intake; The room air valve in the patient Check Fresh Gas setting module is opening.

Check whether the fresh gas flow is adequate and the patient is spontaneously breathing.

Too high pressure or no A continuous ventilation pressure expiration. without a significant change of the pressure value is measured.

Set the APL valve to CMV/SP position.

Invalid CMV parameters The set parameters require a drive Check whether the set values are gas flow that cannot be achieved by correct. the ventilator. The AMV must not exceed 20 l/min and the inspiratory flow must not be higher than 75 l/min. PCV Setting not valid.

The combination of the set ventilation Change the PCV settings. parameters cannot be realized by the ventilator.

Expiratory time too short.

The expiration time is not sufficient to Check the settings of I:E and ventilation completely fill the bellows. frequency.

Resume Ventilation

Ventilation can be resumed after having stopped due to lack a drive gas.

Select a ventilation mode. Resume ventilation.

System pressurized

The system is measuring too high a pressure in the circuit.

Relieve the pressure in the system and close the fresh gas supply.

System vented

The system cannot build up any pressure during the compliance test or fresh gas test.

Check whether the O2 cell and ventilation hoses are correctly connected. If necessary set the APL valve to maximum position.

Drive Gas missing; after The compressed air supply that standby then CMV drives the ventilator has failed.

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Check the compressed air supply.

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Alarm message

Cause

Corrective Measures

Caution! Ventilator has The selector switch has been in an Turn the selector switch to a permissible stopped. Check position impermissible position for more than position. Select a ventilation mode and of mode selector switch 12 sec. resume ventilation. AC Power lost, using Battery

Mains voltage failure. Machine running on batteries.

Check the mains connector. Call a service technician if required.

AC Power lost, using Battery 30 min. (to 10 min) remaining

About 20 min battery supply remaining.

Check the mains connector.

AC Power lost, using Battery 5 min remaining

About 5 min battery supply remaining.

Machine-controlled ventilation will end in approx. 5 minutes. The display will remain until the battery is fully discharged. The patient can be manually ventilated as long as compressed air is available.

AC Power lost, using Battery. Battery running low. Use Manual Ventilation

The voltage supplied by the battery is Check the mains connector. Call a too low for machine-controlled service technician if required. ventilation. The display will go out within a few minutes.

EEPROM – Error during Data for parameters or alarm limit writing. settings were not correctly stored.

Repeat function. Call a service technician if required.

Data exchange faulty.

The data exchange between the ventilation modules has failed.

Repeat function. Restart the machine. Call a service technician if required.

Pressure sensor faulty.

The system has detected a fault on one or both pressure sensors.

Repeat function. Restart the machine. Call a service technician if required.

Breathing system is unlocked.

The breathing system is not correctly Carefully push the patient module into adapted. the docking station and lock it.

Hotwire measurement invalid

The hotwire did not pass the test. It may be damaged.

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Repeat function. Restart the machine. Call a service technician if necessary.

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Alarm message

Cause

Corrective Measures

System vented or drive gas missing

The system was not able to build up pressure.

Check the drive gas supply and verify that the system is closed.

Fault in CPU system

The automatic test has detected a fault in the processor system.

Call a service technician.

CPU monitor failure

The processor monitoring system has Call a service technician. detected a fault.

Expiration valve blocked The airway pressure is not being Inspect the APL valve and check the reduced during the expiration phase. control membranes on the back of the patient module. Fault on solenoid valve(s)

One or more solenoid valve(s) has/have failed.

Repeat the compliance test in standby mode. If the problem still exists, please call a service technician.

Check the bellows valve. The system has detected a pressure increase. The control membranes could leak and control gas could penetrate the system. Fault in proportional The proportional valve that regulates valve the tidal volumes is not working properly.

Check the control membranes.

Pressure Reading out of The system has detected a fault on tolerance. one or both pressure sensors.

Carry out the compliance test in the Standby/OPTIONS menu. If this is not successful, please call a service technician.

Flow/Volume Readings not available Replace Flow Sensor –Call Service

Carry out the compliance test in the Standby/OPTIONS menu. If this is not successful, please call a service technician.

The external flow sensor that measures the expiration volume is faulty.

Carry out the compliance test in the Standby/OPTIONS menu. If this is not successful, please call a service technician.

Flow Error: Use Manual The internal flow sensor and/or the Carry out the compliance test in the Ventilation Call Service measurement of the generated drive Standby/OPTIONS menu. If this is not gas is not working properly. successful, please call a service technician. Temp Sensor readings not available Call Service

The temperature sensor in the patient Carry out the compliance test in the module is defective. Standby/OPTIONS menu. If this is not successful, please call a service technician.

Temp Sensor out of tolerance

The control system for the patient Inform the service department. module heating or the heating mat is defective.

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Alarm message

Cause

Corrective Measures

Fan Error Check Fan Call Service

The fan for the ventilation of the housing and the cooling of installed modules is defective.

Inform the service department.

EEPROM data not saved!

The start-up test for the internal circuits has detected an error. EEPROMS are defective.

Call a service technician.

System error, call a service technician.

The ventilator has a technical defect, Call a service technician. machine-controlled ventilation is not possible.

5.1.1

Alarm messages during the compliance test

During and after the system test, alarm messages are displayed in the lower part of the system test window:

Fig. 10 Example of an alarm message during the compliance test

If the system is error-locked due to a sensor fault, only use the apparatus in an emergency for manual ventilation and inform the technical service department in the case of repeated failure of the compliance test.

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Alarm messages during the compliance test (continuation) # S1

Alarm message System Resistance too high.

S2

Leak rate too high.

S3

Compliance incorrect

S4

Error while saving.

S5

Check the bellows valves.

S6

Pressure sensors faulty.

S7

Flow Error: Use Manual Ventilation Call Service

S8

Flow/Volume Readings not available Replace Flow Sensor –Call Service

S9

Proportional valve def.

S10

Flow control system def.

S11

No data exchange

S12

Fault on solenoid valve(s)

Rev. 1.1 – 07/07

Meaning/Cause The resistance of the patient hoses or the bacteriological filters is too high. The leak rate of the patient module including the patient hoses is greater than 100 ml/min. The compliance of the connected patient hoses is outside the range able to be compensated by the ventilator of 3.0 to 9.9 ml/mbar. Saving of data for parameter and/or alarm limit setting was faulty. The system has detected a pressure increase. The bellows valves are leaking. The system has detected a fault on one or both of the double pressure sensors. Test of internal flow sensor indicates a defect or an internal mis-adjustment of the ventilator. The external flow sensor has not measured the required flow during the test, calibration was not successful. Sensor may be faulty. The proportional valve of the ventilator is defective. The flow control system of the ventilator for the breathing volume is defective. The data exchange between the modules of the ventilator for the control and the display representation is faulty. One or several of the solenoid valves for the control of the bellows valves in the patient module is/are defective.

HEYER Modular, Operator’s manual

Alarm type System alarm

System alarm

System alarm

System alarm

System alarm

System alarm

System alarm

System alarm

System alarm System alarm

System alarm

System alarm

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5.1.2

Alarm messages during the system test

During and after the system test, alarm messages are displayed in the lower part of the system test window:

Fig. 11 Example of an alarm message during the compliance test

If the total leakage of the system exceeds 300 ml/min at 40 mbar, this message is displayed in the bottom part of the system test window, for example.

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# T1

Alarm message O2 cell is faulty.

T2

System Resistance too high.

T3

Leak rate greater than 300 ml/min.

T4

Compliance incorrect

T5

Error while saving.

T6

Check the bellows valves.

T7

No data exchange

Meaning/Cause Alarm type The O2 cell has been System alarm correctly calibrated. Please check O2 cell and repeat test. The resistance of the System alarm patient hoses or the bacteriological filters is too high. The leakage test for the System alarm fresh gas system has detected a leakage greater than 300 ml/min. The compliance of the System alarm connected patient hoses is outside the range able to be compensated by the ventilator. Saving of the data was System alarm faulty. The system has detected a System alarm pressure increase. The bellows valves indicate a leak, please check. The data exchange System alarm between the modules of the ventilator for the control and the display representation is faulty.

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5.1.3

Alarm messages in normal mode

During and after normal operation, alarm messages are displayed in the lower part of the ventilation mode window:

Tidal Volume lower than VTE Ppeak pressure greater than alarm limit

Fig. 12 Example of an alarm message during normal mode

After each activation of CMV mode, for example, the following alarm message appears as a reminder to check the setting of the ventilation pressure valve (APL) in the lower part of the ventilator display.

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Alarm messages in normal mode (continuation)

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# B1

Alarm message Fault in CPU system

B2

CPU monitor failure

B3

Expiration valve blocked

B4

Flow Error: Use Manual Ventilation Call Service

B5

Fault in proportional valve

B6

Fault on solenoid valve(s)

B7

Pressure sensors faulty.

B8

Drive gas failure

B9

Ext. flow sensor faulty.

B12

APNEA

B13

Breathing Circuit Disconnection

B14

PEEP greater than Pmin

Meaning/Cause The self-testing routine of the CPU system has detected a fault in the CPU control system. The monitoring function for the CPU has failed. The ventilation pressure is not falling during expiration. The internal flow sensor for the measurement of the generated breathing volume is not working properly. The proportional valve for the generation of the breathing volume is not working properly. One or several of the solenoid valves for the control of the bellows valves in the patient module is/are defective. The system has detected a fault on one or both of the double pressure sensors. The compressed air supply that generates the drive gas for the ventilator has failed. The external flow sensor for expiratory volume measurement in the patient module is defective. No breathing or ventilation activity has been detected via the expiratory volume measurement. No adequate pressure increase measured during ventilation. The measured PEEP value is higher than the set pressure limit Pmin.

HEYER Modular, Operator’s manual

Alarm type System alarm

System alarm System alarm System alarm

System alarm

System alarm

System alarm

System alarm

System alarm

Alarm for patient monitoring

Alarm for patient monitoring

Alarm for patient monitoring

Rev. 1.1 - 07/07

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# B15

B16 B17 B18 B19 B20

B21 B22 B23

B24

B25

B26

B27 B28

Rev. 1.1 – 07/07

Alarm message FiO2 lower than FiO2 min

Meaning/Cause The measured FiO2 value is lower than the set minimum oxygen concentration limit FiO2 min. Tidal volume lower than Vt The measured tidal volume Vt value min is lower than the set limit for Vt min. Peak pressure greater than The peak pressure Ppeak is higher alarm limit than the set pressure limit Pmax . Peak pressure below alarm The peak pressure Ppeak is lower than limit the set pressure limit Pmin . Minute volume below alarm The breathing minute volume AMV is limit lower than the set limit AMV min. FiO2 greater than FiO2 alarm The measured FiO2 value is higher limit than the set minimum oxygen concentration limit FiO2 max. PEEP exceeded The measured PEEP value is higher than the pre-set value. Temperature sensor defective The temperature sensor in the patient module is defective. Fault on patient module The control system for the patient heating module heating or the heating mat is defective. Fan failure The fan for the ventilation of the housing and the cooling of installed modules is defective. AC Power lost, using Battery The mains voltage supply has failed, the apparatus is running on power supply form the installed battery. Too high pressure or no A continuous ventilation pressure expiration without a significant change of the pressure value is measured. Power supply failure The power supply from the battery is no longer given and will fail shortly. Ambient air intake; Check The emergency valve in the patient Fresh Gas setting module is opening, please check the fresh gas setting and increase the fresh gas flow if necessary.

HEYER Modular, Operator’s manual

Alarm type Alarm for patient monitoring Alarm for patient monitoring Alarm for patient monitoring Alarm for patient monitoring Alarm for patient monitoring Alarm for patient monitoring Alarm for patient monitoring System alarm System alarm

System alarm

System alarm

System alarm

System alarm System alarm

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# B30

Alarm message Set APL Valve to CMP/SP position

B31

f min not reached

B32

f max exceeded

B33

Invalid CMV parameters

B57

Ppeak lower than selected plateau

B58

PCV set values not possible

B59

Expiratory time too short.

Meaning/Cause Reminder that the ventilation pressure valve (APL) must also be switched to CMV/SP position after activating CMV mode. The measured breathing frequency f falls below the set limit for f min. The measured breathing frequency f exceeds the set limit for f max. The set parameters for ventilation in CMV mode give an inspiratory flow that can no longer be achieved by the machine. A minute volume of > 20 L/min, and/or an inspiratory flow of > 80 L/min are considered as the limit values here. The peak pressure Ppeak achieved in PC mode does not reach the set plateau pressure. Check the PCV parameters and increase the set inspiratory flow if necessary. The inspiratory flow set in PCV mode cannot be generated in combination with the parameters for frequency and I/E ratio. Please check the parameter settings. The remaining expiratory time in PCV mode to too short with the set parameters. Check the parameter settings for frequency and I/E ratio.

HEYER Modular, Operator’s manual

Alarm type System alarm

Alarm for patient monitoring

Alarm for patient monitoring

System alarm

Patient alarm

Patient alarm

Patient alarm

Rev. 1.1 - 07/07

HEYER Modular

5.1.4

Alarm message “Technical fault”

# Alarm message H01 Technical fault

Meaning/Cause The ventilator indicates a serious technical fault and stops machine-controlled ventilation in CMV mode.

Alarm type System alarm

This alarm is not displayed in the other used alarm windows of the various displays. This fault is displayed in a window of its own due to its exceptionally high priority level.

Fig. 13 Alarm message “Technical fault”

5.2

Test of alarm functions

APNEA: Please switch the selector switch for ventilation mode to Manual/Spontaneous position and wait for 30 seconds without carrying out any ventilation action. After this time the alarm message “APNEA“ must appear on the screen. P>Pmax: Please switch the selector switch for ventilation mode to CMV position. Connect the apparatus to a test lung and sect the ventilation parameters and alarm settings such that the airway pressure will reach the upper alarm limits. Make sure that the inspiration phase is no active and check the alarm message ”P greater than Pmax“ on the screen after 3 ventilation cycles. FiO2>O2 min: Expose the O2 measuring cell to the ambient air and select a O2-min value higher than 25%. After 3 ventilation cycles the alarm message “FiO2>O2 min“ must appear on the screen.

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6

Start-up and Functional Test

6.1

Preparing for operation

1. Install the apparatus in such a way that the operating panel at the font of the apparatus is within easy reach and the flow measuring tubes can be easily read.

2. Start the compliance test on the apparatus. Follow the instructions on the ventilator display. 3. Carry out the leak test and the O2 calibration. Instructions on these procedures also appear on the ventilator display.

2. When the apparatus has been installed in the correct position, engage the brakes on the front rollers to prevent accidental movement.

4. Ensure that a suitable independent device for manual ventilation (e.g. ambulatory bag) is available at or near the apparatus.

3. Connect the gas connection lines to the gas connections near the rear of the unit. Check that the pressure of the gas supply complies with the specifications of the apparatus. Connect the gas supply by plugging the connectors into the gas supply sockets. Ensure that the connectors are not in the park position.

5. If required, start the additional monitoring for CO2 and anesthesia gases and if available for the ECG and check their function according to the respective operating instructions. The gas return line from monitors operating according to the sidestream procedure should be connected to the connection at the rear side labeled measuring gas return.

4. Plug the mains cable into a grounded socket. Switch on the power supply using the mains switch at the rear side of the apparatus. 5. Wait until the ventilator display requests the compliance test. If the patient module should not yet be connected to the apparatus, remove the transportation cover if necessary and push the patient module into the mount. After pushing in the patient module as far as it will go, lock it in by turning the lever on the underside of the swivel mechanism. 6. Next equip the patient module with the ”Bag-In-Bottle” system, consisting of the bellows and the patient dome. Attach the CO2 absorber. Connect the set of hoses for the anesthesia gas scavenging to the outlet of the overflow/ventilation pressure valve. Create the connection to the anesthetic gas suction unit. 7. Connect the manual ventilation bag to the corresponding hose on the patient module. Connect the patient hose set to the inspiratory and expiratory connections.

6.2

Pre-operative tests

The tests and examinations described below must be carried out before each system start. They are also listed on the check list on the apparatus. 1. Install and lock the vaporizers to be used on the device.

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6.2.1

Compliance test

When the automatic self-test of the system has been completed, the following display appears for the performance of the compliance test.

details on the determined system compliance and leakage of the patient module.

Fig. 16 Display after the compliance test

Fig. 14 Display before the compliance test

Follow the instructions on the ventilator display and activate by pressing the OK button on the touch screen display. The system now checks and calibrates all sensors such as e.g. the expiratory flow sensor and the pressure sensors. Also the internal sensors of the ventilator drive and the active components such as pneumatics control valves are checked during the compliance test.

If the patient tubes were exchanged against others with different hose compliance, the test should be repeated. 6.2.2

O2 Sensor calibration

The following display appears upon the start of the O2 sensor calibration.

The patient module, patient connection hoses, the Y-piece etc. are also tested for leaks. Furthermore the system compliance to which in particular also the patient hoses contribute is detected during the compliance test. During the compliance test a display message confirms that the test is running and a bar indicates its progress. Fig. 17 Display 1 for O2 sensor calibration

Pull the O2 measuring cell out of the mount of the inspiration valve. Connect the cell to the calibration adapter next to the patient module. Then start cell calibration. Attention: The cell must be exposed to the ambient air long enough otherwise incorrect calibration may be the result.

Fig. 15 Display during the compliance test

After the successful compliance test, information on the result is displayed with the message “Compliance Test Passed” including

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During calibration of the O2 sensor, a display appears providing information on the progress of the calibration process.

6.2.3

Leak test fresh gas system

To carry out a leak test for the entire fresh gas system, select the “Fresh gas test” button on the display.

Fig. 18 Display 2 for O2 sensor calibration

The result of the O2 sensor calibration is then displayed as follows:

Fig. 20 Display before the leak test for the fresh gas system

Follow the instructions on the ventilator display. Connect the patient hoses and the hose of the manual ventilation device, i.e. of the reservoir/manual ventilation bag, to the Ypiece. Set the ventilation pressure valve (APL) to max position and start the fresh gas test by activating the Ok screen button. Apart from the leak test for the fresh gas system on the patient module, patient connection hoses, Y-piece etc., the tightness of the measuring tube block, vaporizer mount, and/or activated vaporizer, absorber, manual ventilation hose and ventilation pressure valve is tested.

Fig. 19 Display 3 for O2 sensor calibration

Remove the O2 measuring cell from the calibration adapter and re-insert it in the inspiration valve mount. This completes the calibration of the O2 sensor.

During the leak test on the fresh gas system, a display appears on the screen to confirm that this test is being carried out.

Fig. 21 Display during the leak test for the fresh gas system

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