Maquet servo i инструкция по эксплуатации на русском

• Сравнить

• Избранное

Доставка
(до пункта самовывоза)
БЕСПЛАТНО!

• Онлайн оплата на нашем сайте (Безопасно. Быстро. Просто. Удобно.)
• В офисе (Эквайринг терминал / наличный расчет)
• При получении заказа в пункте выдачи (Эквайринг терминал / наличный расчет)
• При получении заказа курьером (Эквайринг терминал / наличный расчет)
• Оплата через Сбербанк Онлайн

Задайте вопрос специалисту

Консультант по медицинскому оборудованию, Светлана:
Помогу с
выбором и порекомендую лучшее

Экспертно подберем аппарат ИВЛ и комплектующие!

Servo-i Ventilator System

Service Manual

Important

General

•Service documentation for the Servo-i Ventilator 1 System consists of:

–User’s manual. The User’s manual is an indispensable complement to the Service Manual for proper servicing.

–Service Manual

–Installation Instructions

–Spare Parts information.

–Documentation for all optional equipment included in the Servo-i System is also available.

•The Servo-i Ventilator System is referred to as the Servo-i troughout this manual.

•There are two serial number labels on the unit:

–One label is attached to the Patient Unit close to the supply gas inlets. The serial number stated on this label is the ID number of the Patient Unit. The serial number is also stored in the SW memory as the ‘System ID’.

–One label is attached to the rear side of the User Interface close to the On/Off switch. The serial number stated on this label is the ID number of the User Interface.

•System version number can be found in the Status window on the User Interface. Make sure that the version of the User’s manual corresponds to the System version.

Text inside a box is used to highlight important information.

•In addition to the Important information given here and in the related documents (e. g. in the User’s manual), always pay attention to applicable local and national regulations.

•Responsibility for the safe functioning of the equipment reverts to the owner or user in all cases in which service or repair has been done by a non-professional or by persons who are not employed by or authorized by Maquet, and when the equipment is used for other than its intended purpose.

Symbols used in this manual

•ESD sensitive components. When handling ESD-sensitive devices,

established procedures must be observed to prevent damage.

• Special waste. Discard disposable, replaced and left-over parts in accordance with appropriate industrial and environmental standards.

• Recycling. Recycle if possible. Recycling facilities may not be available in all areas.

• Technical training. Refers to the Technical training supplied by Maquet.

•Service contract. Refers to the Service contract supplied by Maquet.

Hazard notices

•Before disassembling or assembling of the Servo-i, make sure that the:

–On/Off switch is set to Off.

–Mains power cable is disconnected.

–Gas supply is disconnected (wall and/or cylinder).

–Battery modules are disconnected.

–The Servo-i is cleaned according to instructions in the User’s manual, chapter ‘Routine cleaning’ and chapter ‘Regular maintenance’, section ‘Extended cleaning of inspiratory channel’.

•With power supply connected to the Servo-i, there are energized electrical components inside the unit. All personnel must exercise extreme caution if fault tracing or adjustments are performed with power supply connected and with user interface and patient unit covers removed.

Important

Installation

• Only personnel trained and authorized by Maquet shall be permitted to install the Servo-i. The installation and handing over procedures are described in the ‘Servo-i Ventilator System – Installation Instructions’.

Functional check

•After any installation, maintenance or service intervention in the Servo-i, perform a ‘Pre-use check’ according to instructions in the ‘Servo-i Ventilator System – User’s manual’.

Service

• The Servo-i must be serviced at regular intervals by personnel trained and authorized by Maquet.

Any maintenance or service must be noted in a log book provided.

•It is recommended that maintenance and service is done as a part of a service contract with Maquet.

•Preventive maintenance must be performed at least once every year as long as the unit is not used more than normal. Normal operation is estimated to correspond to approx. 5.000 hours of operation. Details are found in this Service Manual, chapter ”Preventive maintenance”.

•The Battery modules shall be replaced every three years.

•The internal Lithium batteries (on PC 1771 and PC 1772) shall be replaced every five years.

•Worn-out batteries must be recycled or disposed of properly according to local

regulations. Recycle facilities may not be available in all areas.

•Batteries must not be disposed of with ordinary waste. Discard all other disposable, replaced and left-over parts in accordance with appropriate industrial and environmental standards.

•When working with ESD sensitive components, always use a grounded wrist band and a grounded work

surface. Adequate service tools must always be used.

To the responsible service personnel

• The contents of this document are not binding.

If any significant difference is found between the 1 product and this document, please contact

Maquet for further information.

•We reserve the right to modify products without amending this document or advising the user.

• Only personnel trained and authorized by Maquet shall be permitted to perform installation, service or maintenance of the Servo-i. Only Maquet genuine spare parts must be used. PC boards (spare parts) must always be kept in a package for sensitive electronic devices. Maquet will not otherwise assume responsibility for the materials used, the work performed or any possible consequences of same.

•The device complies to standards and requirements as stated in the ‘Servo-i Ventilator System – User’s manual’.

Important

Environmental declaration

Purpose

1 This environmental declaration is for a Servo-i basic unit including the carrier and one battery.

Letters codes within brackets refers to the Functional Block Diagram in chapter Diagrams.

Components with special environmental concern

Components listed below shall be disposed of in an environmentally safe way.

Printed circuit boards

• PC 1770 Main back-plane

• PC 1771 Control, including a Lithium battery (C)

• PC 1772 Monitoring, including Lithium battery (M)

• PC 1775 Plug-and-Play back-plane (P)

• PC 1777 Panel (U)

• PC 1778 DC/DC & Standard connectors (P)

• PC 1780 Pneumatic back-plane (I)

• PC 1781 Pressure transducer, 2 pcs (T)

• PC 1784 Expiratory channel (F)

• PC 1785 Expiratory channel connector (E)

• PC 1786 Expiratory channel cassette (E)

• PC 1789 Remote alarm connector (A)

Other electronics

•TFT assembly including backlight (U)

•Touch screen (U)

•O2 cell, containing Pb (I)

•Air module, containing multiple PC boards (I)

•O2 module, containing multiple PC boards (I)

•AC/DC Converter, containing PC boards (P)

•Expiratory cassette (E)

•Expiratory valve coil (E)

•Safety valve pull magnet (I)

Construction materials

The construction materials used in Servo-i in % of the total weight.

Metal – total 77%

•Aluminium 70%

•Steel, zink, brass 8%

Polymeric material – total 9%

•PA (Polyamide)

•POM (Polyoxymethylene)

•SI (Silicone)

•TPE (Thermoplastic elastomer)

•PUR (Polyurethane)

•ABS (Acrylicnitrilebutadienstyrene)

•EPDM (Ethylenepropylenedienemonomer)

•PTFE (Polytetrafluoroethylene)

•FPM (Fluororubber)

•NBR (Nitrilerubber)

•PP (Polypropylene)

•PVC (Polyvinyl chloride)

•PS (Polystyrene)

Electronics – total 14%

•Accumulators Nickel Metalhydride

•Printed circuit boards, cables etc.

Others – very small amounts

• Sterile filter paper of glass fibre

Important

Articles of consumption

1.Bacteria filter

2.Filters for the gas modules

3.Filter for the inspiration pressure transducer

4.Filter for the O2 cell

5.Nozzle units for the gas modules

6.Battery modules

7.Lithium batteries

8.Expiratory cassette

9.Expiratory cassette membrane

10.O2 cell

11.Backlight lamps.

Item 1: Consumption approximately 250 pcs/year. Items 2 – 5: Changed approx. every 5.000 hours. Items 6 – 7: Changed approx. every 15.000 hours. Items 8 – 11: Changed when needed.

Power consumption

The power consumption depends on the operating mode and whether the internal batteries are being fast or trickle charged.

Noise level

Less than 50 dBA.

1

Packing materials

The amounts of packing materials will vary depending on customer adaptation.

Materials for packing:

•Loading pallet. Fulfils the USA requirements 7 CFR 319.40 May 25’th 1995.

•Corrugated cardboard

•Stretch film of Polyethylene, PE.

•Shock-absorbing material of expanded polyethylene, EPE, or expanded polypropylene, EPP.

•Clamps of Polyethylene, PE.

Only personnel trained and authorized by Maquet shall be permitted to perform installation, service or maintenance of the Servo-i.

Make sure to prepare the Servo-i properly before disassembling and assembling. Refer to section ‘Hazard notices’ in chapter ‘Important’.

Any service or maintenance must be noted in a log book.

Discard disposable, replaced and left-over parts in accordance with appropriate industrial and environmental standards.

After any installation, maintenance or service intervention in the Servo-i, perform a ‘Pre-use check’. Refer to the ‘Servo-i Ventilator System – User’s Manual’ for details.

2. Introduction

User Interface

2

Patient Unit

Servo-i

Mobile Cart

Main units

The Servo-i is available in different main configurations:

•Infant

•Adult

•Universal

These main configurations are as standard equipped with a number of ventilation modes suitable for each patient category. Further ventilation modes can be installed via software Option Upgrades.

The Servo-i can be divided into the following main units:

•User Interface. The User Interface contains all controls used to set the ventilation and monitoring parameters. Ventilation parameters as well as other important information are shown on the User Interface display.

•Patient Unit. The Patient Unit contains pneumatics and electronics for gas supply to the patient. Power supply and battery back-up is also contained in the Patient Unit.

The Control cable connects the User Interface and the Patient Unit.

The Servo-i shown in the illustration is mounted onto the optional Servo-i Mobile cart.

A number of optional equipment can be added to the Servo-i Ventilator System. For further information, refer to the documents listed below.

Servo-i Mobile cart

•Mobile cart with drawers

•Mobile cart without drawers

•Mobile cart for Compressor Mini. Refer to:

•Servo-i – User’s Manual

•Servo-i Mobile cart – Installation Instructions

Servo Ultra Nebulizer, Servo-i

Refer to:

•Servo-i – User’s Manual

•Servo Ultra Nebulizer, Servo-i – Installation Instructions

Compressor Mini

Refer to:

•Servo-i – User’s manual

•Compressor Mini – Operating Manual

•Compressor Mini – Service Manual

•Compressor Mini – Installation Instructions

Servo-i Holder

Refer to:

•Servo-i – User’s Manual

•Servo-i Holder – Installation Instructions

Servo-i Shelf base

Refer to:

•Servo-i – User’s Manual

•Servo-i Shelf base – Installation Instructions

Support Arm 177

•Servo-i – User’s manual

•Support Arm 177 – Installation Instructions

Gas trolley

•Servo-i – User’s manual

•Gas trolley – Installation Instructions

Gas cylinder restrainer

•Servo-i – User’s manual

•Gas cylinder restrainer – Installation Instructions

2

IV Pole, Servo-i

•Servo-i – User’s manual

•IV Pole, Servo-i – Installation Instructions

User Interface panel cover

•Servo-i – User’s manual

•User Interface panel cover – Installation Instructions

Battery module

•Servo-i – User’s manual

•Battery module – Installation Instructions

CO2 Analyzer module, Servo-i

•Servo-i – User’s manual

•CO2 Analyzer module, Servo-i – Installation Instructions

Humidifier holder and Humidifier

•Servo-i – User’s manual

•Humidifier – Operating Manual

•Humidifier holder – Installation Instructions

Alarm output connector

•Servo-i – User’s manual

•Alarm output connector – Installation Instructions

•Alarm output connector – Reference Manual

SVX9011

User Interface

The User Interface can be mounted onto the Mobile cart but can also easily be removed from the cart and mounted on the bed post or table/shelf.

The User Interface can be rotated and tilted into a suitable position. Locking levers, mounting devices and some other items are shown in the illustration above.

1.Display with touch screen.

2.Fixed keys for immediate access to special

windows.

3.Main rotary dial.

4.Special function keys.

5.Direct access knobs.

6.Mains indicator (green).

7.Standby indicator (yellow).

8.Start/Stop (Standby) ventilation key.

9.Luminescence detector, adjusts display brightness automatically.

10.Loudspeaker grid.

11.Cable reel.

12.PC card slot with slot cover.

13.Control cable between User Interface and Patient Unit.

14.Service connector, for PC.

15.On/Off switch.

16.Panel holder

17.Locking screw, alternative mounting

18.Locking arm, rotation

19.Locking arm, tilting.

20.Serial number label. The serial number stated on this label is the ID number of the User Interface. This serial number must always be refered to when ordering service, spare parts, etc for the User Interface.

For further information regarding operation of the User Interface, refer to the User’s manual.

Patient Unit

The Patient Unit can be rotated on and pulled out of the Servo-i Mobile cart. It can also be mounted onto a Servo-i Holder or a Servo-i Shelf base.

Items accessible from the outside of the Patient Unit are shown in the illustration above.

1.Handle.

2.Gas inlet for Air.

3.Gas inlet for O2.

4.Equipotentiality terminal.

5.Mains supply connector incl. fuses F11 and F12.

6.Internal fan with filter.

7.Connector for external +12V DC power supply.

8.Fuse F1 for external +12V DC power supply.

9.Optional connector.

10.Control cable connector.

11.9-pole serial port for data communication (RS232).

12.Expiratory outlet.

13.Inspiratory section cover.

14.Expiratory inlet.

15.Module unit for connecting optional modules, e. g. up to six Battery modules.

16.Connector for Servo Ultra Nebulizer, Servo-i.

17.Inspiratory outlet.

18.Alarm output connector (optional).

19.Serial number label. The serial number stated on this label is the ID number of the unit. This serial number must always be refered to when ordering service, spare parts, software updates/upgrades, etc.

Servo-i software structure

PC1777 PANEL

PANEL S/W

PC1772 MONITORING

SW

SVX9143

General

The Servo-i SW installed in the ventilator will contain all available system functionality. The software is separated into different subsystems and stored on some of the PC boards. The separation of the software is handled by the installation program.

The Servo-i software is divided into the following software subsystems:

•Breathing

•Monitoring

•Panel

•System ID

Breathing

The Breathing SW controls the delivery of gases to the patient. This subsystem is responsible for the breathing system, that is:

• Ventilation control and regulation

• Inspiratory channel

• Expiratory channel

Only personnel trained and authorized by Maquet shall be permitted to perform installation, service or maintenance of the Servo-i.

Make sure to prepare the Servo-i properly before disassembling and assembling. Refer to section ‘Hazard notices’ in chapter ‘Important’.

Any service or maintenance must be noted in a log book.

Discard disposable, replaced and left-over parts in accordance with appropriate industrial and environmental standards.

After any installation, maintenance or service intervention in the Servo-i, perform a ‘Pre-use check’. Refer to the ‘Servo-i Ventilator System – User’s Manual’ for details.

3. Description of functions

About this chapter

This text refers to the Functional Main Blocks diagram in chapter ‘Diagrams’.

Memory types used in the Servo-i

There are four different types of memories used in the Servo-i:

•Flash memory. For software storage. Can be upgraded / updated via a System SW Update. Present on PC 1771, PC 1772, PC 1777 and PC 1784.

•ID-PROM: The ID information can be read by the Servo-i.

•On/Off switch: Switch to Power up or Power down the Servo-i. Refer to section ‘Power supply’.

•Connection for PC (P86): Ethernet port intended for test and service purpose. Connected via a service cable. For future options.

•Microphone used to monitor of sounds from the Loudspeaker.

Note: The System SW must be re-installed if PC 1777 is replaced

•RAM. For temporary storage of software and data. Present on PC 1771, PC 1772 and PC 1777.

3• Non-volatile memory. RAM with battery back-up. For settings, trends and logs. Present on PC 1771 and PC 1772.

•EEPROM. For PC board information, configuration, calibration data, etc. Present on almost all PC boards and in the O2 cell.

User Interface

Loudspeaker

For generation of sound, e.g. alarm. Connected to P72 on PC 1777 Panel.

The loudspeaker generates different tones with individual sound volumes. At start-up and during Pre-use check the function of the loudspeaker is monitored by the microphone on PC 1777. During operation it is continuously monitored through current sensing.

Functional Main Blocks diagram marking: ‘U‘

User Interface controls

Setting of different parameter input values is made with the help of the following different interface devices:

•Main Rotary Dial (rotary encoder with switch).

•Direct Access Control, 4 each (rotary encoders).

•Membrane buttons. Integrated parts of the Touch screen assembly.

•Touch screen.

PC 1777 Panel

Some features included on PC 1777 Panel are:

•SIMM (Single In-line Memory Module) mounted on its connector P77. Memory type: SDRAM

•PC Card Slot intended for connection/insert of a PC Card. PC Cards are used to:

–Download software into the different flash memories situated on PC-boards marked µP and into the EEPROM on PC 1770 Main Back-plane.

–Transfer patient and system data for further transfer to a computer.

–Service purpose.

•Microprocessor on this board includes control of the functions of the User Interface.

Backlight Inverter

PC board with driving stage for backlight (lamps) mounted behind the TFT Display. The supply voltage delivered by the Backlight Inverter is 660 V.

The Backlight Inverter is connected to P73 on PC 1777 Panel.

Touch screen assembly

The Touch screen implies the touch function of the front panel screen and is interactive with information displayed on the TFT Display. The front panel frame with the touch screen, membrane buttons and DIM sensor forms the Touch screen assembly and must be handled as one complete part. The DIM sensor measures the ambient light and the screen brightness is automatically adjusted.

TFT Display with Backlight

The TFT Display is a Thin Film Transistor Screen for color display of pictureand alphanumeric data.

The Backlight consists of two fluorescent tubes (lamps) mounted behind the TFT Screen. They are driven from the Backlight Inverter. Estimated lifetime (with acceptable brightness level) for the lamps is 30.000 hours. Using the Field Service System (FSS), a time meter for the lamps can be shown. The time meter must be reset after replacement of the lamps.

Patient unit

Inspiratory section

Functional Main Blocks diagram marking: ‘I‘

The main block Inspiratory Section conveys the breathing gas from its gas inlets for Air and O2 supply to the patient breathing system. It comprises the following main functions:

•Gas Modules – Air and O2.

•Connector Muff.

•Inspiratory Pipe.

•O2 Cell.

•Temperature Sensor.

•Inspiratory Pressure Tube.

•Safety Valve incl. pull magnet.

•Inspiratory Outlet.

•PC 1780 Pneumatic Back-Plane.

Gas modules – Air and O2

The Air and O2 Gas Modules regulates the inspiratory gas flow and gas mixture.

SVX9003

Gas inlet

Gas supply is connected to the ventilators gas inlet nipples. The design of the gas inlet nipples and their color markings vary according to the standard chosen.

Gas is to be connected from hospital central gas supply or from gas cylinders. The Air supply may be connected from a compressor for medical air.

Filter

The Filter protects the ventilator from particles in the gas delivered to the Gas Modules. The filter must be replaced during the ”Preventive maintenance”.

The filter housing and the filter cover are provided

with matching guide pins. These guide pins prevent 3 mounting of the filter cover (with gas inlet nipple) on

the wrong module.

A non-return valve for the gas inlet is located in the filter cover. This valve will suppress short pressure drops in the gas supply.

The non-return valve is also designed to slowly evacuate compressed gas from the module, if the gas supply to the module is disconnected.

Inspiratory valve temperature sensor

The temperature of the supplied gas is measured by the Inspiratory Valve Temperature Sensor. This sensor is situated in the gas flow.

The output signal from this sensor is used to compensate for the gas density variations due to temperature.

Supply pressure transducer

The pressure of the supplied gas is measured by the Supply Pressure Transducer.

The output signal from this transducer is amplified. It is then used to calculate the absolute pressure of the gas to compensate for gas density variations due to pressure.

1.Filter

2.Inspiratory valve temperature sensor

3.Supply pressure transducer

4.Flow transducer (Delta pressure transducer and net)

5.Nozzle unit with valve diaphragm

6.Inspiratory solenoid

The Gas Modules are factory calibrated. Each Gas Module must not be disassembled further than described in chapter ‘Preventive maintenance’.

Flow transducer

The gas flows through a net (resistance) which causes a pressure drop. The pressure is measured on both sides of this net and the differential pressure value is then amplified.

Description of functions

Nozzle unit

The plastic Nozzle Unit contains a valve diaphragm. The valve diaphragm, controlled by the Inspiratory Solenoid, regulates the gas flow through the Gas Module.

The complete plastic nozzle unit must be replaced during the ‘Preventive maintenance’.

After replacement, allow the diaphragm to settle during approx. 10 minutes before gas pressure is connected to the Gas Module.

Inspiratory solenoid

The gas flow through the Gas Module is regulated by the Inspiratory Solenoid via the Nozzle Unit.

3The current supplied to the solenoid is regulated so that the gas module will deliver a gas flow according to the settings on the User Interface.

Gas module key

The Gas Modules are provided with a mechanical key to prevent that the module is mounted in the wrong slot.

The key consists of a plastic guide mounted underneath the module and a corresponding guide mounted in the patient unit.

ID PROM

Each Gas Module is provided with an ID-PROM. The ID information can be read by the Servo-i System.

Connector muff

The Connector Muff connects the Gas Module outlets to the Inspiratory Pipe inlet.

Inspiratory pipe

The Inspiratory Pipe leads the gas from the Connector Muff to the Inspiratory Outlet.

The Inspiratory Pipe comprises:

•Housing and locking lever for the O2 Cell with its bacteria filter.

•Housing for the Safety Valve.

•Connection for measurement of inspiratory pressure.

The pipe is provided with internal flanges with the purpose to improve mixing of O2 and Air.

Servo-i Ventilator System

O2 cell

The O2 Cell is mounted in a housing on the Inspiratory Pipe and is protected by a bacteria filter.

SVX9015

Maintenance including exchange of bacteria filter according to the User´s manual. The bacteria filter must also be replaced during the ‘Preventive maintenance’.

The O2 cell gives an output voltage proportional to the partial pressure of oxygen inside the Inspiratory pipe. At constant ambient pressure this output is proportional to the O2 concentration in percent.

In each O2 cell, the output signal will stay at a fairly constant level usually within 10–17 mV in normal air and at standard barometric pressure during the life time of the cell.

The life time of the cell is affected by the O2 concentration. With a concentration (at the cell) in % and expected cell life time in hours the following applies at 25oC (77oF):

O2 Conc. x Expected cell life = 500 000% hours.

The O2 cell is automatically calibrated each time a Pre-use check is performed (if O2 is connected to the ventilator).

If the ventilator has continually been in use for a long time, the measured O2 concentration may drop due to normal degradation of the O2 cell. This will activate a nuisance alarm. For further information, refer to the User’s manual, chapter section ‘O2 cell adjustment’.

Note: Pre-use check is recommended to use to calibrate the O2 cell.

An ID PROM is integrated into each O2 cell. Its ID information and remaining lifetime can be read by the Servo-i.

Temperature sensor

A Temperature Sensor is integrated into the connector on top of the O2 Cell. This sensor measures the temperature inside the Inspiratory Section.

The output signal, corresponding to the temperature in the Inspiratory Section, is used for regulation of the Internal Fan. The electronics for this regulation is located on PC 1775 Plug-and-play back-plane.

•The pressure inside the inspiratory pipe is above

117 ±7 cm H2O. This is an extra safety function and this situation will normally not occur.

•The safety valve will also be opened by some other alarms, e. g. the Out of gas-alarm.

During startup, the pull magnet is electrically activated so that the pull magnet axis is pushed up (with a clicking sound). This is the normal operational position of the pull magnet; the Safety Valve is normally kept closed.

Inspiratory pressure tube

The Inspiratory Pressure Tube connects the Inspiratory Pipe with the Inspiratory Pressure Transducer. A bacteria filter protects the pressure transducer on PC 1781 Pressure Transducer from contamination.

Maintenance including exchange of bacteria filter according to User´s manual. The bacteria filter must also be replaced during the ‘Preventive maintenance’.

Safety valve

The movable axis of the Safety Valve Pull Magnet controls the opening and closing of the safety valve membrane in the Inspiratory Pipe. The pull magnet is electrically activated (closed) from the main block Expiratory Channel.

The safety valve opening pressure is calibrated to 117 ±3 cm H2O during each Pre-use check.

Inspiratory outlet

22 mm / 15 mm tube connector for the inspiratory 3 tube of the patient breathing system.

PC 1780 Pneumatic back-plane

Interconnecting board including connectors for cables to the Gas Modules as well as to the Safety Valve and to the O2 Cell and the Temperature Sensor.

Description of functions

Expiratory section

Functional Main Blocks diagram marking: ‘E‘

The main block Expiratory Section conveys the breathing gas from the patient breathing system to the Expiratory Outlet. It comprises:

•Measurement of expiratory flow

•Connection for measurement of expiratory pressure.

•Controlling element for the regulation of expiratory pressure.

Expiratory cassette

3The expiratory gas conveying parts and PC 1786 Expiratory Channel Cassette are integrated into one part – the Expiratory Cassette – which can be easily removed for cleaning or exchange. See Servo-i Ventilator System – User’s manual.

The expiratory cassette can be interchanged between different Servo-i systems. A Pre-use check is always required after exchanging the expiratory cassette.

Expiratory inlet

22 mm / 10 mm tube connector for the expiratory tube of the patient breathing system. The inlet is designed to make condensed water drip out and allow use of a water trap for such water to be collected. Expiratory inlet bacteria filter can be connected to protect the cassette from contamination.

Heating foil

An electrical Heating Foil applied on the outside of the expiratory pipe where the Ultrasonic Flowmeter is situated. The purpose of the Heating Foil to reduce condensation and maintain a stable temperature in the expiratory gas.

Servo-i Ventilator System

Ultrasonic flowmeter

The Ultrasonic Flowmeter is a measuring device for the expiratory gas flow, using ultrasound technique with two ultrasonic transducers/recievers.

The measuring process is controlled from the main block PC 1784 Expiratory Channel.

SVX9018

The left hand side transducer is sending out ultrasonic sound that is reflected against the inner wall of the expiratory channel. The ultrasonic sound is recieved by the right hand side transducer now acting as a reciever. The time from sending to recieving ultrasonic sound in downstream expiratory gas flow is measured.

Then the right hand side transducer (earlier recieving) is sending out ultrasonic sound upstream the expiratory gas flow. The ultrasonic sound is recieved by the left hand side transducer now acting as a reciever. The time from sending to recieving ultrasonic sound in upstream expiratory gas flow is measured.

The time difference between the downstream and the upstream time measurements provides flow information.

A temperature sensor inside the cassette measures the expiratory gas temperature. This temperature measurement is also used when calculating the expiratory flow.

Bacteria filter and expiratory pressure tube

Via a Bacteria Filter inside the cassette, the Expiratory Pressure Tube connects the cassette to the Expiratory Pressure Transducer. The filter and the connector are integrated parts of the cassette. The filter protects the transducer on PC 1781 Pressure Transducer from contamination.

Expiratory valve

The Expiratory Valve consists of a membrane in the cassette that is operated by the axis of the Expiratory Valve Coil. The valve is fully open as long as no power is supplied to the coil.

Operating capacity for the membrane is estimated to 10.000.000 breathing cycles. When this limit is passed or if the membrane for some reason has become defective, it must be replaced. Refer to instructions in chapter ‘Disassembling and assembling’.

Remaining operating capacity (in %) for the membrane can be shown in the Status window. Select Status / Exp. cassette to check ‘Remaining membrane capacity’. The operating capacity meter must be reset after replacement of the membrane.

PC 1785 Expiratory channel connector

The PC 1785 Expiratory Channel Connector is a connector board including signal filters that is mounted in the expiratory cassette compartment. It connects to PC 1786 mounted in the Expiratory Cassette when the cassette is docked to the expiratory cassette compartment.

PC 1770 Main back-plane

Interconnection board for the PC boards in the lower part of the patient unit.

The ventilators System ID (Serial No.), configuration, time stamp for preventive maintenance, etc, is stored in an EEPROM on PC 1770. Thus, when replacing

PC 1770, a spare part that is factory programmed for 3 the concerned ventilator must be used.

As the preventive maintenance time stamp will be reset when replacing PC 1770, a new time stamp must be set via the Biomed menu. In order to make this new time stamp correct, the preventive maintenance must be performed. Refer to chapter ‘Preventive maintenance’.

Expiratory valve coil

The movable axis of the Expiratory Valve Coil controls the opening of the Expiratory Valve by pushing the valve membrane into desired position. The power supply to the coil is regulated so that the remaining pressure in the patient system, towards the end of the expiration time, is kept on the PEEP level according to front panel setting.

Expiratory outlet with expiratory one-way valve

The gas from the patient system leaves the ventilator via this Expiratory Outlet. Backflow via the cassette is prevented by the Expiratory One-Way Valve. Its rubber membrane and valve seat are integrated parts of the Expiratory Outlet.

PC 1786 Expiratory channel cassette

The PC 1786 Expiratory Channel Cassette is a connection board, integrated into the Expiratory Cassette, for the Ultrasonic Flowmeter and for the Heating Foil. It connects to PC 1785 mounted in the expiratory cassette compartment.

Includes an ID PROM. The ID information can be read by the Servo-i System.

Pressure transducers

Functional Main Blocks diagram marking: ‘T‘

PC 1781 Inspiratory pressure transducer

The pressure, conveyed via the pressure tube connected to this block, is led to and measured by its differential pressure transducer. With differential reference to the ambient pressure, the output signal is proportional to the measured pressure thus giving a linear measurement in the range -40 cm H2O to +160 cm H2O.

Technical limitation: Pressure exceeding ±400 cm H2O must be avoided.

Includes an ID PROM. The ID information can be read by the Servo-i System.

PC 1781 Expiratory pressure transducer

Function identical to PC 1781 Inspiratory Pressure Transducer.

PC 1784 Expiratory channel

Functional Main Blocks diagram marking: ‘F‘

The main block Expiratory channel comprises microprocessor control to achieve measurement of expiratory flow. The output signal Exp. Flow is used in the main block Control.

Electronics including microprocessor (µP) for handling of:

•All electronic connections to and from the Expiratory Section functions.

•Measurement of airway pressures in both Inspiratory Section and Expiratory Section.

•Control of the Safety Valve functions in the

3Inspiratory Section.

A thermistor on PC 1784 monitors the temperature inside the Patient Unit. An alarm is activated if the temperature is 77 ±5 °C (170 ±9 °F) or higher.

Includes an ID PROM. The ID information can be read by the Servo-i System.

Note: The System SW must be re-installed if PC 1784 is replaced.

Regulation of a constant Inspiratory flow during expiration time: The desired constant Inspiratory flow value is the default or preset Bias flow value (see User’s manual).

This desired constant Inspiratory flow value is used to generate the flow reference signals Insp Flow Ref 1 and Insp Flow Ref 2 with the same relation and same handling as described above under ”Regulation of Inspiratory flow…” except this occurs during expiration time.

The electronics controlling the optional Servo Ultra Nebulizer is located on PC 1771 Control.

Includes an ID PROM. The ID information can be read by the Servo-i System.

Note: The System SW must be re-installed if PC 1771 is replaced.

A lithium battery on PC 1771 power supplies the internal memory on the PC board. If the battery on PC 1771 is disconnected or if the battery voltage is too low, user default configurations made via the Field Service System (FSS) and Pre-use check results including transducer calibrations will be erased. The lithium batteries must be replaced after 5 years.

PC 1771 Control

Functional Main Blocks diagram marking: ‘C‘

The main block Control comprises microprocessor control of Breathing pattern for all different ventilation modes.

Electronics including microprocessor (µP) control to achieve:

1.Regulation of Inspiratory flow which is used during inspiration time in Volume Control (VC) mode.

2.Regulation of Inspiratory pressure which can be used during inspiration time in any mode.

3.Regulation of a constant Inspiratory flow which is used during expiration time in all modes.

4.Respiratory timing pattern including frequency as well as distribution of the duration for Inspiration time, Pause time and Expiration time according to front panel settings.

5.Regulation of Inspiratory flow during inspiration time. The desired total Inspiratory flow value according to front panel settings is used to generate the flow reference signals Insp Flow Ref 1 and Insp Flow Ref 2. The level relation between these two flow reference signals depends on the

desired O2 concentration according to front panel setting. Insp Flow Ref 1 and Insp Flow Ref 2 are used for the control of its respective Gas Module (Air and O2).

PC 1772 Monitoring

Functional Main Blocks diagram marking: ‘M‘

The main block Monitoring comprises microprocessor (µP) calculation of parameters and monitoring of alarm limits with control of alarms (as well as backup alarm). The main block Monitoring cooperates with the Loudspeaker in the User Interface.

The PC 1772 Monitoring handles all supervision and alarms in the system. It activates pressure reducing mechanisms, including activation of the safety valve, in case of excessive breathing system pressure.

All alarms are conveyed and displayed on the front panel and the alarm sound is also generated. In case of malfunction in the loudspeaker located on PC 1777 Panel, a back-up sound generating device (buzzer) on PC 1772 will be activated automatically. This buzzer is monitored by a microphone at startup and during the Pre-use check.

The following voltages are supervised:

•+24 V

•+12 V

•-12 V

•+5 V

•+3.3 V.