Mindray AS3000 Service Manual

Ser vice Manual

Datascope

AS™

A n e s t h e s i a D e l i v e ry S ys t e m

Ser vice Manual

Datascope

AS™

A n e s t h e s i a D e l i v e ry S ys t e m

AS3000™ is a U.S. trademark of Mindray DS USA, Inc.

Krytox® is a U.S. registered trademark of E. I. du Pont de Nemours and Company

Selectatec® is a U.S. trademark of Datex Ohmeda

Glyptal® is a U.S. registered trademark of Glyptal, Inc.

Dräger Vapor® and plug-in system S-2000 are registered trademarks of Dräger Medical.

Copyright © Mindray DS USA, Inc., 2008. All rights reserved. Contents of this publication may not be reproduced in any form without permission of Mindray DS USA, Inc.

AS3000™ Service Manual

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Table of Contents

Foreword .......................................................................................................................................................	vii
Warnings, Cautions and Notes ........................................................................................................................	vii
Warnings ......................................................................................................................................................	vii
Cautions .......................................................................................................................................................	viii
Notes ............................................................................................................................................................	ix
Theory of Operation .....................................................................................................	1 - 1
Introduction................................................................................................................................................	1 - 1
Microprocessor-controlled Ventilator..............................................................................................................	1 - 2
Components...............................................................................................................................................	1 - 3
Front View ..........................................................................................................................................	1 - 3
Side View...........................................................................................................................................	1 - 5
Rear View...........................................................................................................................................	1 - 7
Other components (not identified in graphics) .........................................................................................	1 - 8
Breathing System.................................................................................................................................	1 - 9
The Ventilator Unit ...............................................................................................................................	1 - 9
Adjustable Alarms .............................................................................................................................	1 - 10
Compliance Compensation.................................................................................................................	1 - 10
Electrical Supply .......................................................................................................................................	1 - 11
Electrical components.........................................................................................................................	1 - 11
Ventilator Control and Drive.......................................................................................................................	1 - 12
BDU (Basic Digital Unit)......................................................................................................................	1 - 12
Amplifier Board ........................................................................................................................	1 - 14
Drive Gas Pressure Sensor Board ................................................................................................	1 - 19
PAW Pressure Sensor Board.......................................................................................................	1 - 20
Breathing System Heater ............................................................................................................	1 - 21
Sensor Board............................................................................................................................	1 - 23
Power Management...........................................................................................................................	1 - 26
Battery .............................................................................................................................................	1 - 28
Power Supply....................................................................................................................................	1 - 28
Anesthesia System Components ..................................................................................................................	1 - 29
Auxiliary Outlets................................................................................................................................	1 - 29
Absorber Heater Wire Board ..............................................................................................................	1 - 29
Work Light Board ..............................................................................................................................	1 - 29
Ventilator UI .............................................................................................................................................	1 - 31
Keyboard Board................................................................................................................................	1 - 31
Display.............................................................................................................................................	1 - 34
Communication Interface / RS232 Isolate Board ...................................................................................	1 - 35
Fuses ...............................................................................................................................................	1 - 35
Ventilator Pneumatic - O2 Drive Gas ...........................................................................................................	1 - 36
Ventilator pneumatic drive ..................................................................................................................	1 - 36
Drive Pressure-High pressure regulator .................................................................................................	1 - 36
Gas Box Assembly.............................................................................................................................	1 - 36
Tube color coding..............................................................................................................................	1 - 36
The Breathing System ................................................................................................................................	1 - 37
CMV mode, inspiration ......................................................................................................................	1 - 37
CMV mode, expiration.......................................................................................................................	1 - 37
Manual mode, inspiration...................................................................................................................	1 - 38
Manual mode, expiration ...................................................................................................................	1 - 38
Pneumatic PEEP .................................................................................................................................	1 - 39
Ventilator in Standby..........................................................................................................................	1 - 39
Breathing System Components ............................................................................................................	1 - 39
Ventilation Bellows System..........................................................................................................	1 - 39

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Table of Contents

Manual Breathing Bag ...............................................................................................................	1 - 39
CO2 Absorber ..........................................................................................................................	1 - 39
Inspiratory and Expiratory Valves ................................................................................................	1 - 39
APL (Airway Pressure Limiting) valve ............................................................................................	1 - 39
Installation Guide .........................................................................................................	2 - 1
Delivery of The New Anesthesia Machine ......................................................................................................	2 - 1
Assembly ...................................................................................................................................................	2 - 2
Unpacking..........................................................................................................................................	2 - 2
Breathing System and Breathing System Accessories ................................................................................	2 - 2
Attaching the Mounting Arms and User Interface.............................................................................	2 - 3
Breathing System Connections ......................................................................................................	2 - 3
Anesthesia System Connections.....................................................................................................	2 - 3
Tank Wrench and Pre-operation Checklist...............................................................................................	2 - 4
Patient Suction Regulator and Arm.........................................................................................................	2 - 4
Suction Canister Bracket.......................................................................................................................	2 - 4
Utility Tray, Monitor Mounting Arm with Utility Hook(s).............................................................................	2 - 4
Vaporizers..........................................................................................................................................	2 - 4
High Pressure Hoses ............................................................................................................................	2 - 5
Emergency Cylinder(s) .........................................................................................................................	2 - 5
Breathing Circuit, CO2 Absorbent, and Liquid Vaporizer Agent ................................................................	2 - 5
Monitoring Products - Mounting and Electrical Connection........................................................................	2 - 6
Agent Monitor Waste Gas Scavenging ..................................................................................................	2 - 6
Oxygen Sensor Calibration ..................................................................................................................	2 - 6
Installation Checkout Procedure ....................................................................................................................	2 - 8
Repair Information .......................................................................................................	3 - 1
Introduction................................................................................................................................................	3 - 1
Warnings and Cautions...............................................................................................................................	3 - 2
Warnings ...........................................................................................................................................	3 - 2
Cautions.............................................................................................................................................	3 - 2
Troubleshooting Guidelines ..........................................................................................................................	3 - 2
Special Tools Required ................................................................................................................................	3 - 3
Troubleshooting Chart .................................................................................................................................	3 - 4
Common Symptoms and Corrective Actions for Field Service Technicians ...................................................	3 - 4
Leak Troubleshooting.................................................................................................................................	3 - 11
Test Pneumatics ........................................................................................................................................	3 - 12
Leak Test - Manual Ventilation Test.......................................................................................................	3 - 12
Safety Valve Test ...............................................................................................................................	3 - 13
Leak Test - Automatic Ventilation Test....................................................................................................	3 - 14
Compliance Test................................................................................................................................	3 - 15
Pneumatic Hose and Wiring Diagrams ........................................................................................................	3 - 16
Pneumatic Hose Labeling....................................................................................................................	3 - 16
Sampling Pipeline Module Interface Labeling ........................................................................................	3 - 17
Electrical Cable Labeling ....................................................................................................................	3 - 18
Replacement Parts and Accessories...............................................................................	4 - 1
Introduction................................................................................................................................................	4 - 1
Available Replacement Parts and Sub-Assemblies ...........................................................................................	4 - 1
Exchange Program ..............................................................................................................................	4 - 1
Replacement Parts Pricing Information ....................................................................................................	4 - 1
Ordering Information ...........................................................................................................................	4 - 2
Isometric Drawings......................................................................................................................................	4 - 3
Chassis ..............................................................................................................................................	4 - 3
Chassis Parts List .........................................................................................................................	4 - 5

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Table of Contents

Breathing System.................................................................................................................................	4 - 6
Breathing System Parts List..........................................................................................................	4 - 11
Electric Box.......................................................................................................................................	4 - 12
Electric Box Parts List..................................................................................................................	4 - 12
Gas Circuit Box.................................................................................................................................	4 - 13
Gas Circuit Box Parts List............................................................................................................	4 - 13
User Interface....................................................................................................................................	4 - 14
User Interface Parts List...............................................................................................................	4 - 15
Flowmeter.........................................................................................................................................	4 - 16
Flowmeter Parts List....................................................................................................................	4 - 16
Calibration ...................................................................................................................	5 - 1
Introduction................................................................................................................................................	5 - 1
Calibration Warnings, Precautions, and Notes...............................................................................................	5 - 2
Warnings ...........................................................................................................................................	5 - 2
Cautions.............................................................................................................................................	5 - 2
Notes.................................................................................................................................................	5 - 3
General Guidelines.....................................................................................................................................	5 - 4
Test Equipment and Special Tools Required....................................................................................................	5 - 4
Calibration Procedures ................................................................................................................................	5 - 4
Oxygen Sensor Calibration ..................................................................................................................	5 - 4
Proportional Valve Regulator Calibration ................................................................................................	5 - 6
Flow Sensor Calibration .......................................................................................................................	5 - 7
Flow Valve Calibration.........................................................................................................................	5 - 9
Paw Sensor.......................................................................................................................................	5 - 10
PEEP Valve .......................................................................................................................................	5 - 11
Flow Meter .......................................................................................................................................	5 - 12
Leakage detection..............................................................................................................................	5 - 13
Startup leakage detection...........................................................................................................	5 - 13
APL Valve leakage detection.......................................................................................................	5 - 13
Safety Valve leakage detection ...................................................................................................	5 - 13
Breathing System leakage detection.............................................................................................	5 - 13
Compliance detection ........................................................................................................................	5 - 13
Periodic Maintenance....................................................................................................	6 - 1
Maintenance Schedule ................................................................................................................................	6 - 1
Periodic Maintenance Consumable Parts Kits..................................................................................................	6 - 1
Periodic Maintenance Schedule of Service Activities........................................................................................	6 - 2
Visual Inspection Checklist ...........................................................................................................................	6 - 2
Replacement of Consumable Parts.................................................................................................................	6 - 3
Check Valve Cleaning .................................................................................................................................	6 - 4
Tools and Materials .............................................................................................................................	6 - 4
Cleaning Procedure .............................................................................................................................	6 - 5
Battery Maintenance and Replacement ........................................................................................................	6 - 13
Battery Maintenance ..........................................................................................................................	6 - 13
Battery Replacement ..........................................................................................................................	6 - 13
Functional Tests ........................................................................................................................................	6 - 13
Test Equipment and Special Tools Required...........................................................................................	6 - 13
Pressure Regulator Checks ..................................................................................................................	6 - 14
Proportional Valve Regulator ......................................................................................................	6 - 14
Gas Delivery System Tests...................................................................................................................	6 - 14
O2 Flush Verification .................................................................................................................	6 - 14
O2:N2O Ratio System ...............................................................................................................	6 - 15
Start-Up Tests ....................................................................................................................................	6 - 15

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Table of Contents

System Self Test.........................................................................................................................	6 - 15
Leak/Safety Valve Test...............................................................................................................	6 - 15
Leak Test ..................................................................................................................................	6 - 17
Compliance Test .......................................................................................................................	6 - 20
Manual Leak Test ......................................................................................................................	6 - 21
Oxygen Sensor Calibration ........................................................................................................	6 - 22
Pneumatic Leak Tests..........................................................................................................................	6 - 24
N2O Cylinder Leak Test .............................................................................................................	6 - 24
O2 Cylinder Leak Test................................................................................................................	6 - 24
AIR Cylinder Leak Test ...............................................................................................................	6 - 24
Line Supply Check Valves Test ....................................................................................................	6 - 24
N2O Line Pressure Leak Test .......................................................................................................	6 - 25
O2 Line Pressure Leak Test..........................................................................................................	6 - 25
AIR Line Pressure Leak Test .........................................................................................................	6 - 25
Cylinder Supply Check Valves Test ..............................................................................................	6 - 25
Breathing System Checks....................................................................................................................	6 - 26
Waste Gas Scavenger Test (if available) ......................................................................................	6 - 26
Internal Gas Connections Test .....................................................................................................	6 - 26
Drive Gas Pressure Loss Alarm, N2O Cutoff Test ...........................................................................	6 - 26
Performance Verification ....................................................................................................................	6 - 27
Standby Mode Ventilation Test....................................................................................................	6 - 27
Manual Mode Ventilation Test ....................................................................................................	6 - 27
APNEA Alarm Test ....................................................................................................................	6 - 27
Alarm MUTE Test.......................................................................................................................	6 - 27
CMV Adult Ventilation Mode Test................................................................................................	6 - 28
CMV Child Ventilation Mode Test................................................................................................	6 - 29
Airway Disconnect Alarm Test.....................................................................................................	6 - 29
PCV Adult Ventilation Mode Test .................................................................................................	6 - 30
Pressure Support (PS) Ventilation Mode Test..................................................................................	6 - 31
Alarms and Failsafe Functions .............................................................................................................	6 - 32
Set Up .....................................................................................................................................	6 - 32
Low FiO2 Alarm Test..................................................................................................................	6 - 32
High FiO2 Alarm Test ................................................................................................................	6 - 33
Peak Pressure Alarms Test ..........................................................................................................	6 - 33
Minute Volume Alarm Test ..........................................................................................................	6 - 34
Miscellaneous Tests............................................................................................................................	6 - 34
Test the Line Voltage Alarm ........................................................................................................	6 - 34
Wheel Brakes Test.....................................................................................................................	6 - 34
Work Light Test .........................................................................................................................	6 - 34
Auxiliary Flowmeter...................................................................................................................	6 - 35
Patient Suction Regulator (if available) .........................................................................................	6 - 35
Vaporizers........................................................................................................................................	6 - 35
Vaporizer Interlock Test..............................................................................................................	6 - 35
Vaporizer Accuracy Test ............................................................................................................	6 - 36
Vaporizer Leak Test ...................................................................................................................	6 - 36
Dräger Vapor 2000 Operating Instructions ARRB-F001 .................................................................	6 - 37
Electrical Tests...................................................................................................................................	6 - 38
Convenience AC Outlets Test......................................................................................................	6 - 38
Electrical Safety Inspection Test ...................................................................................................	6 - 38
AS3000 Installation Checklist .............................................................................................................	6 - 38
Cleaning..................................................................................................................................................	6 - 39
Cleaning and Disinfecting the AS3000 ................................................................................................	6 - 39

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Table of Contents

Cleaning and Sterilizing the Breathing System and Components..............................................................	6 - 39
Preoperative Checklist ...............................................................................................................................	6 - 39
Phone Numbers and How To Get Assistance................................................................................................	6 - 47
Warranty .....................................................................................................................	7 - 1
Warranty Statements...................................................................................................................................	7 - 1
Disclaimers ................................................................................................................................................	7 - 2
Product Improvements ..........................................................................................................................	7 - 2
Manufacturer’s Responsibility .......................................................................................................................	7 - 2

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Foreword	Introduction

Foreword

This Service Manual is intended as a guide for technically qualified personnel performing repair and calibration procedures.

Warnings, Cautions and Notes

Please read and adhere to all warnings, cautions and notes listed here and in the appropriate areas throughout this manual.

A WARNING is provided to alert the user to potential serious outcomes (death, injury, or serious adverse events) to the patient or the user.

A CAUTION is provided to alert the user to use special care necessary for the safe and effective use of the device. They may include actions to be taken to avoid effects on patients or users that may not be potentially life threatening or result in serious injury, but about which the user should be aware. Cautions are also provided to alert the user to adverse effects on this device of use or misuse and the care necessary to avoid such effects.

A NOTE is provided when additional general information is applicable.

Warnings

WARNING: Whenever using anesthetic gases, nitrous oxide, oxygen, or any hospital gas always follow the appropriate agent evacuation/collection procedures. Use the hospital gas evacuation system.

WARNING: For continued protection against fire hazard, replace all fuses with the specified type and rating.

WARNING: In order to prevent an electric shock, the machine (protection class I) may only be connected to a correctly grounded mains connection (socket outlet with grounding contact).

WARNING: Remove all accessory equipment from the shelf before moving the anesthesia machine over bumps or on any inclined surface. Heavy top loading can cause the machine to tip over causing injury.

WARNING: Possible explosion hazard. Do not operate machine near flammable anesthetic agents or other flammable substances. Do not use flammable anesthetic agents (i.e., ether or cyclopropane.)

WARNING: The use of anti-static or electrically conductive respiration tubes, when utilizing high frequency electric surgery equipment, may cause burns and is therefore not recommended in any application of this machine.

WARNING: Possible electric shock hazard. The machine may only be opened by authorized service personnel.

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Introduction	Cautions

WARNING: Compressed gasses are considered Dangerous Goods/ Hazardous Materials per I.A.T.A. and D.O.T. regulations. It is a violation of federal and international law to offer any package or over pack of dangerous goods for transportation without the package being appropriately identified, packed, marked, classified, labeled and documented according to D.O.T. and I.A.T.A. regulations. Please refer to the applicable I.A.T.A. Dangerous Goods Regulations and /or the Code of Federal Regulations 49 (Transportation, Parts 171-180) for further information.

WARNING: Avoid exposure to respiratory gases by always directing the fresh gas flow from the fresh gas outlet to the waste gas scavenger.

Cautions

CAUTION: This device uses high pressure compressed gas. When attaching or disconnecting backup gas cylinders, always turn the cylinder valves slowly. Use the AS3000 flow meters to bleed down the pressure, watching the cylinder gauge indicate the depleting cylinder pressure, before disconnecting the cylinder from the yoke. Always open and close cylinder valves fully.

CAUTION: This device operates using compressed gas at high pressures from the hospital central supply. When connecting gas supply lines attach the hose connection to the machine before connecting the quick disconnect fitting to the hospital source. Disconnect the supply hose from the hospital source connection prior to disconnecting it from the AS3000 gas connection fittings.

CAUTION: Refer to the “Periodic Maintenance Schedule of Service Activities” on page 6-2, in the Periodic Maintenance section for assistance when performing scheduled periodic maintenance.

CAUTION: Do not leave gas cylinder valves open if the pipeline supply is in use and the system master switch is turned to 'ON'. If used simultaneously, cylinder supplies could be depleted, leaving an insufficient reserve supply in the event of pipeline failure.

CAUTION: Use cleaning agent sparingly. Excess fluid could enter the machine, causing damage.

CAUTION: This machine must only be operated by trained, skilled medical staff.

CAUTION: Perform the electrical safety inspection as the last step after completing a repair or after routine maintenance. Perform this inspection with all covers, panels, and screws installed.

CAUTION: After changing the CO2 absorbent, carry out a system leak test.

CAUTION: Only Selectatec™ compatible vaporizers with Interlock-

System may be used with the AS3000 unit.

CAUTION: After each exchange of a vaporizer, carry out a system Leak test.

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Notes	Introduction

CAUTION:	The bellows dome cannot be autoclaved.
CAUTION:	Do not clean the machine while it is on and/or plugged in.
CAUTION:	Pressing “Quit” at any time during the procedure will cancel
	the session's settings and reload the previously-stored
	calibration coefficients.
CAUTION:	Depleted soda lime changes color. Replace the soda lime if
	approximately 2/3 of the absorber content is discolored.
	CO2 absorbent can be safely changed without stopping
	mechanical ventilation.
Notes
NOTE:	Unauthorized servicing may void the remainder of the
	warranty. Check with the factory or with a local authorized
	distributor to determine the warranty status of a particular
	instrument.

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1.0 Theory of Operation

1.1 Introduction

The AS3000 is a continuous flow anesthesia system which offers manual or automatic ventilation, easily adjustable fresh gas delivery, anesthetic agent delivery, ventilation monitoring, convenient ergonomics, and state-of-the-art safety systems. The components of the AS3000 Anesthesia System are described this chapter.

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1 - 1

Microprocessor-controlled Ventilator	Theory of Operation

1.2 Microprocessor-controlled Ventilator

The Microprocessor-controlled ventilator, with its dedicated Breathing System, allows timecontrolled, pressure limited, constant volume ventilation for all patient groups within a tidal volume range of 40 mL (4 kg infant) to 1400 mL (large adult).

Time-controlled, pressure limited, and compliance compensated constant volume ventilation is provided through the Controlled Mandatory Ventilation (CMV) mode. The CMV mode delivers a viable ventilation method for complicated lung conditions. The ventilator also provides time-controlled, volume dependant ventilation, targeting a set (adjustable) target pressure provided through the Pressure Controlled Ventilation (PCV) mode. Automatic and comprehensive system startup tests and alarm management systems ensure controlled ventilation conditions in every mode of operation.

The durable and ergonomically designed user interface and Navigator™ Knob enables easy operation. The display provides the selected ventilation modes (CMV, PCV, PS and SIMV) and the following values: Tidal Volume, Peak Pressure, Mean Pressure, FiO2, Breath Rate, I:E Ratio, PEEP, Plateau Pressure, Alarm limits, and real-time Airway Pressure and flow waveform.

	P
	Exp. Valve
			APL Valve
	Absorber	Breathing	Exhaust
Patient	Canister	Bag	Valve
			Bellows
		Reversing	Breathing
	Insp. Valve	Valve	AGSS
			System
	O2 Sensor
	Electronic		PEEP
	Control		Valve
		Solenoid
		Valve	Ventilator
		Proportional
		Valve
	Fresh Gas	Pressure		AIR•	O2
		Regulator		Flow
					Flow
				Meter	Meter
					O2
					Outlet
					Pressure
		O2			Switch
		Flush
						P
						Cylinder	O2
			Flow			O
				Pressure
		Vaporizer	Tubes		Inlet Filter	P
			Vaporizer	Regulator		P
			V					Gas Inlet
						Cylinder	AIR
						O		Block
				Pressure	Inlet Filter	P
				Regulator
						P
						Cylinder	N20
			Ratio•			O
			Controller	Pressure
			N20•		Inlet Filter	P
			Cuttoff	Regulator

FIGURE 1-1 The AS3000 Pneumatic System

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Theory of Operation	Components

1.3 Components

1.3.1	Front View
	1

11

3

10

4

5

6

7

8

9

FIGURE 1-2 AS3000 Front View

1. Monitor Arm

The Monitor Arm provides support for a bedside monitor. It can easily rotate for more convenient viewing.

2. User Interface

The display of the user Interface provides waveforms, numeric data and menu tabs. The keys and Navigator Knob enable the user to power up the system, silence alarms, access menu tabs, and switch between manual and mechanic ventilation.

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Components	Theory of Operation

3. UI Arm

The UI Arm provides support for the user interface assembly. It can easily rotate for more convenient viewing.

4. Oxygen Sensor

The Oxygen Sensor monitors the oxygen concentration of the inspired gas of the Breathing System.

5. Breathing System

The Breathing System’s main function is to store anesthetic gas, oxygen, and air; vent exhaust gas; and absorb carbon dioxide. It connects directly to the respiratory passage to help complete the breathing process.

6. CGO (Common Gas Outlet) Subassembly

Mixed gas composed of O2, AIR, N2O, and anesthetic agent connects to the patient's

Breathing System via a flexible tube from the CGO Subassembly.

7. O2 Flush Valve

The O2 Flush Valve is located on the front of the AS3000. The supplied gas does not pass the flowmeter and vaporizer. It is directly sent to the fresh gas outlet. Press this button to supply gas (35 - 50 L/min). Release this switch to automatically close the gas supply.

8. AGSS (Anesthetic Gas Scavenging System)

The AGSS (Anesthetic Gas Scavenging System) reclaims exhausted gas generated during anesthesia.

9. Drawer Subassembly

The AS3000 has three drawers for storage, which can be locked and fixed through the uppermost drawer lock.

10. Vaporizer Mounting Manifold

The Vaporizer Mounting Manifold provides support for up to two Selectatec® compatible anesthetic vaporizers.

11. Flowmeter

The Flowmeter displays gas flow values for N2O, O2, AIR, Auxiliary O2, and Auxiliary AIR. It consists of coarse and fine flow tubes used to accurately measure gas flow with additional flow tubes to measure auxiliary O2 and AIR gas flow.

Flow tube measurement values:

GAS	FINE FLOW TUBE	COARSE FLOW TUBE		AUXILIARY FLOW TUBE
		-01 UNITS	-02 UNITS
N2O	0 - 1 L/min	1 - 12 L/min	1 - 10 L/min	N/A
O2	0 - 1 L/min	1 - 10 L/min	1 - 10 L/min	0 - 15 L/min
AIR	0 - 1 L/min	1 - 15 L/min	1 - 12 L/min	0 - 15 L/min

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Theory of Operation	Components
1.3.2	Side View
	12
	13
	14
	15
	16
	17
	18
	19
	20
	21
	22
	23
	FIGURE 1-3 AS3000 Side View
	12. Upper Mainframe Subassembly
	The Upper Mainframe Subassembly provides support for the pressure gauges, the Flowmeter,
	the gas box assembly, the mains supply assembly, and the YOKE assembly.
	13. User Interface Cable
	The User Interface Cable provides signal transmission between the User Interface and the
	main unit.

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Components	Theory of Operation

14. Auxiliary Gas Outlet Assembly

The Auxiliary Gas Outlet Assembly provides the patient with auxiliary oxygen and air mixtures (of different concentrations). It also contains an O2 connection for use with other equipment.

15. Breathing System Interface

The Breathing System Interface provides a connection interface for gas signal acquisition between the Breathing System and gas circuit.

16. Breathing System Pneumatic Hose

The Breathing System Pneumatic Hose provides multiple connections including: PEEP control, Auto/Manual control, and four pressure sampling connections between the Breathing System and mainframe.

17. O2 Sensor Cable

The O2 Sensor Cable provides a connection between the oxygen sensor component in the Breathing System and the oxygen concentration signal acquisition port on outlet module of the mainframe.

18. Breathing System Interface

The Breathing System Interface provides the main unit with an interface for connection with drive gas, heating system and the oxygen concentration sensor of the Breathing System.

19. The Breathing System Support Arm

The Breathing System Support Arm provides connection between the Breathing System and the mainframe, in order to support the Breathing System.

20. Heater Wire

The Heater Wire provides connection to the heating system of the Breathing System. By heating the Breathing System during anesthesia, accumulation of water in the Breathing System is minimized. It also provides comfortable gas to the patient.

21. AGSS Transfer Hose

The AGSS Transfer Hose provides pipeline connection between the exhaust gas outlet of the Breathing System and the AGSS evacuation system.

22. Lower Mainframe Assembly

The Lower Mainframe Assembly provides support for the drawer subassembly, outlet module, CGO subassembly, O2 flush valve and the electric box. Together with the Upper Mainframe Subassembly and Base Assembly, forms the mainframe of the machine.

23. Base Assembly

The Base Assembly provides support to the whole machine. The four casters provide movement for the machine in any direction. The front casters have a locking function.

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Theory of Operation	Components
1.3.3	Rear View
	24
	25
	26
	27
	28
	29
	30
	31
	32
	33
	FIGURE 1-4 AS3000 Rear View

24. Top Shelf Assembly

The Top shelf Assembly includes the work light and its switch. It also serves as a storage area.

25. Gas Input Assembly

The Gas Input Assembly allows gas in the pipeline and backup gas cylinder to enter the AS3000 for regulation. The Pressure regulator reduces pressure to 36 psi (250 kPa). The O2 operated valve can open allowing N2O to enter the flowmeter only when O2 pressure is above 7.3 psi (50 kPa). Otherwise, N2O cannot enter the gas circuit. The pressure switch generates a signal when the input pressure is below 29 psi (200 kPa), and the system will provide an audible alarm.

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Components	Theory of Operation

	26. Vaporizer Storage Mount
	The Vaporizer Storage Mount provides the AS3000 with auxiliary placement for a
	vaporizer.
	27. Mains Supply Assembly
	The Mains Supply Assembly attaches the AS3000 to an external AC wall outlet. It also
	supplies power throughout the unit.
	28. Electronic Flowmeter Assembly
	The Electronic Flowmeter Assembly provides fresh gas flow measurement for the AS3000.
	29. Gas Box Assembly
	The Gas Box Assembly provides drive gas to the Breathing System and includes a safety
	valve to insure that pressure stays below 85 cmH2O. It also contains the PEEP valve, and the
	differential pressure sensors.
	30. YOKE Assembly
	The YOKE Assembly provides connection for three backup gas cylinders. The pressure
	regulator for the backup gas cylinder reduces the pressure of a high pressure gas cylinder
	down to 43.5 psi (300 kPa).
	31. AMP Cables
	The AMP Cables provide signal transmission between the electric box and gas circuit box.
	32. Electric Box Assembly
	The Electric Box Assembly provides, and distributes power to the AS3000.
	33. Rear Panel Assembly
	The Rear Panel Assembly protects, and provides heat dissipation for the electric box and
	auxiliary support for the backup gas cylinder.
1.3.4	Other components (not identified in graphics)
	34. Inspiratory and Expiratory Valves

The Inspiratory and Expiratory Valves are unidirectional valves that allow air to flow in only one direction.

35. Absorber Canister

The AS3000 uses two Absorber Canisters which can contain 1500 mL of soda lime each. They can be used for 6 - 8 hours each if full. Water generated from the reaction with CO2 is drained from a valve on the lower side of the canister.

36. APL (Airway Pressure Limiting) Valve

The APL Valve is used for limiting maximum airway pressure during manual ventilation. The adjustable range of the APL is 0 - 70 cmH2O.

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Theory of Operation	Components

	37. Bellows Assembly
	The AS3000 employs ascending ventilation bellows, in which mixed gas is stored. Drive
	gas supplied by the ventilator forces the bellows to descend sending mixed gas into the
	inspiratory passage of patient's airway. If a patient's airway suffers from gas leakage, the
	bellows will collapse, informing the operator of a possible problem. A tidal volume scale is
	provided on the transparent dome, through which a patient's tidal volume can be estimated.
	38. Pressure-relief Valve
	The Pressure-relief Valve is located at the base of the bellows. When end-expiration airway
	pressure reaches 1 - 3 cmH2O, the pressure-relief valve opens and redundant gas is
	expelled.
	39. Exhaust Gas Outlet
	The Exhaust Gas Outlet is located on the lower part of the Breathing System. It is connected
	to the AGSS or via the AGSS transfer tube.
	40. Absorber Heating System
	The Breathing System is heated to body temperature to avoid humidified gases condensing
	within the Breathing System thus improving airway climatization for the patient's re-breathing
	of respiratory gases.
1.3.5	Breathing System
	The Breathing System is integrated into a compact aluminum block. This block is heated to
	body temperature to prevent condensing of humidified gases within the Breathing System,
	thus improving airway climatization for the patient's re-breathing of respiratory gases. The
	heated Breathing System contains: an inspiratory valve with O2 adapter for FiO2
	measurement, expiratory valve, APL Valve, breathing bag connection, and internal
	inspiratory and expiratory flow sensors.
1.3.6	The Ventilator Unit
	The AS3000 ventilator offers multiple ventilation modes: Controlled Mandatory Ventilation

with volume control (CMV), Pressure Control Ventilation (PCV), Synchronized Intermittent Mandatory Ventilation (SIMV), and Pressure Support (PS) ventilation. Electronic PEEP is available in all ventilation modes. User control over inspiratory flow (SLOPE) is possible in PCV, SIMV, and PS modes. Automatic fresh gas compensation limits the effect of user changes in fresh gas flow rate on the patient. The traditional bellows system is driven by oxygen and makes patient disconnections clearly visible.

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Components	Theory of Operation

1.3.7	Adjustable Alarms
	Minimum and maximum alarm limits can be set for Peak Pressure, Mean Pressure and FiO2.
	Minimum alarm limits can be set for Tidal Volume and Minute Volume. Exceeding the peak
	pressure alarm limit automatically halts the inspiratory phase preventing airway pressure
	from exceeding the high alarm setting. In the CMV mode, when reaching this pressure limit,
	a “High Airway Pressure” alarm is displayed, and inspiration is discontinued. The next
	inspiration occurs at the regular time interval, preventing increase of the respiratory rate. The
	result is a decreased tidal volume (T Vol.) and minute volume (M Vol.). During pressure
	limitation, the ventilator displays the alarm message until the condition is corrected.

1.3.8 Compliance Compensation

Compliance compensation automatically corrects for the expansion of the circuit in CMV ventilation mode. System compliance is measured by the ventilator to maintain the set tidal volume (±15%). The compliance test may be bypassed at machine power up. When bypassing the compliance test, the default settings are used.

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Theory of Operation	Electrical Supply

1.4 Electrical Supply

1.4.1

Electrical components

Ventilator UI

Anesthesia

10.4” TFT-LCD

Backlight Inverter

Light Back FM

Amplifier for

Keypad

Light Work

PC104

audio alarm

Communication

Knob

and Interface

Cable

SW

Ventilator Control and Drive

Switch

BDU

PWR MNG

Pwr

Heater AC

Amplifier

DC/DC

Ctrl &

Protect

DA

Switch

Flow Probe

Pressure Airway

Sensor FiO2

Pressure Source Gas

.Insp .Val .P

.Val Manual/Mech

Valve .Cal

Sensor Flow FM

PEEP .Exp .Val

Signals Internal

BAT

PS

Power Supply

Inlet Filter

.Insp Flow

AC/DC

Aux Mains

Outlet

FIGURE 1-5 Electrical Components Overview

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Ventilator Control and Drive	Theory of Operation

1.5	Ventilator Control and Drive
1.5.1	BDU (Basic Digital Unit)
	The BDU serves as the active ventilator control. The BDU controls the actions of the PEEP,
	calibration, and proportional valves, and reads the signal flow, and pressure sensors and
	valves

FIGURE 1-6 BDU Control Board, Top View

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Theory of Operation	Ventilator Control and Drive

FIGURE 1-7 BDU Control Board, Bottom View

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Ventilator Control and Drive	Theory of Operation

1.5.1.1Amplifier Board

FIGURE 1-8 Amplifier Board, Top View

FIGURE 1-9 Amplifier Board, Bottom View

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Theory of Operation	Ventilator Control and Drive

O2 Sensor Input, S4

PIN	NAME	FUNCTION
1.	O2-	O2	Sensor Input -
2.	O2-	O2	Sensor Input -
3.	O2+	O2	Sensor Input +
4.	O2+	O2	Sensor Input +

DC Power Input, J7

PIN	NAME	FUNCTION
1.	GND	Power Ground
2.	+5V	Controller Logic Power
3.	P12V	Power 12V
4.	PWBUS	Power Bus 24V
5.	GND	Analog Ground
6.	A12V	Analog 12V
7.	5V/4.8V	Power 5V/4.8V

Power Control, J20

PIN	NAME	FUNCTION
1.	GND	Ground
2.	/PWON	Power On Enable, Low active
3.	PWEN	Power On Enable, High active
4.	5VAUX	5V Auxiliary
5.	DC_M	AC/DC Monitor signal
6.	PWBUS	Power bus
7.	BAT_M	Battery Monitor signal
8.	APE	Auxiliary Power Enable
9.	CHAR_SIGNAL	Charge Status, No connection
10.	/MUTE	Mute, No connection

Signals and Power to Keyboard, J5

PIN	NAME	FUNCTION
1.	ENPW	Power Enable, High active
2.	/PWON /	Power on Enable, Low active
3.	5VAUX	5V Auxiliary
4.	APE	Auxiliary Power Enable
5.	GND	Ground
6.	TTLRX	TTL Receive
7.	232ARX	RS232A Receive
8.	232BRX	RS232B Receive
9.	GND	Ground

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Ventilator Control and Drive	Theory of Operation

Signals and Power to Keyboard, J5 (Continued)

PIN	NAME	FUNCTION
10.	PWBUS	PowerBus
11.	PWBUS	PowerBus
12.	PWBUS	PowerBus
13.	GND	Ground
14.	GND	Ground
15.	DC24V	DC24V monitor
16.	BATV+	Battery monitor
17.	/MUTE	No connection
18.	GND	Ground
19.	TTLTX	TTL Transmit
20.	232ATX	RS232A Transmit
21.	232BTX	RS232B Transmit
22.	GND	Ground
23.	PWBUS	PowerBus
24.	PWBUS	PowerBus
25.	GND	Ground

Signals and Power to Sensor Board, J30

PIN	NAME	FUNCTION
1.	A+12V	Analogue +12V
2.	FL_INS	Import flow
3.	FL_EXP	Export flow
4.	FM_FL	Flowmeter flow
5.	Pair	Pressure of air
6.	Paw	Pressure inside air way
7.	Pgas	Pressure gas supply status
8.	GND	Ground
9.	AGND	Analog Ground
10.	AGND	Analog Ground
11.	P24V	Power 24V
12.	P24V	Power 24V
13.	P24V	Power 24V
14.	P12V	Power 12V
15.	P12V	Power 12
16.	P5V	Power 5V
17.	P5V	Power 5V
18.	Inhale	Inspire Valve
19.	Man	Manual/AUTO Valve
20.	Exhale	Expire Valve
21.	Exhale	Expire Valve
22.	AGND	Analog Ground

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Theory of Operation	Ventilator Control and Drive

Signals and Power to Sensor Board, J30 (Continued)

PIN	NAME	FUNCTION
23.	AGND	Analog Ground
24.	AGND	Analog Ground
25.	AGND	Analog Ground

Bus to BDU, J96

PIN	NAME	FUNCTION
1 - 3	5V	5V Power
4 - 6	GND	Ground

Test Point Definition

DESIGNATOR	NAME	FUNCTION	RANGE
T1	FIO2	ADC input of O2 Sensor	0.25-0.51V (In AIR)
T2	Pgas	Pressure switch of gas supply,
		low active
T3	FL_INSP	Inspire Flow signal	0.20-0.30V (0 flow)
T4	Pair	Absolute Pressure of air way	1.7-2.1V (atmospheric
			pressure)
T5	FL_EXP	Expire flow signal	0.20-0.30V (0 flow)
T6	Fm_fl	Flow of flowmeter	0.25-0.51V (flowmeter off)
T7	AD-Exhale	PEEP valve, current feedback	Level depends on PEEP
			setting and vent mode. No
			activity may indicate open
			connection from driver to
			valve (ie. bad cable)
T8	Volt	Internal power inspect
T9	MUTE	Not used
T10	M-EN	Manual/Auto mode select
T11	V-EN	Valves enable Input	Global valve enable signal.
			Must be active for valves to
			operate.
T12	EX-DA	Exhale DA output
T13	In-DA	Inhale DA output
T14	GS_ST	gas supply status, high active
T15	XVI	unamplified version of T7
T16	IVI	unamplified version of T28
T17	MVI	Manual-Valve current feedback
T18	IVG	Proportional valve drive signal,	Level depends on machine
		drives T16 and T28	settings.
T19	XVG	PEEP valve drive signal - drives	Level depends on PEEP
		T15 and T7	setting and vend mode.
T20	PADJ	Power 4.8V	4.8V
T21	P24V	Power 24V	24V
T22	P12V	Power 12V	12V

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