Valleylab LigaSure User manual

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Service Manual
LigaSure™Vessel Sealing
Generator
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ii LigaSure Vessel Sealing Generator Service Manual
This manual and the equipment it describes are for use only by qualified medical
professionals trained in the particular technique and surgical procedure to be
performed. It is intended as a guide for servicing the Valleylab LigaSure™Vessel
Sealing Generator only. Additional information about using the generator is
available in the LigaSure™Vessel Sealing Generator User’s Guide.
Equipment covered in this manual
Valleylab LigaSure™vessel sealing generator - 120V / 240 V
The LigaSure™Vessel Sealing Generator Service Manual consists of two
parts—the text and a Schematics Supplement.
Valleylab Part Number 1009892
Effective Date May 2008
Trademark acknowledgments
LigaSure™and Instant Response™are trademarks of Valleylab, Boulder, CO.
Patents
One or more of the following U.S. patents and corresponding foreign patents
cover the LigaSure vessel sealing generator and accessories:
Additional patents pending.
Manufactured by
Valleylab, a division of Tyco Healthcare Group LP
Boulder, Colorado 80301-3299 USA
European Representative
Tyco Healthcare UK Ltd.
Gosport, PO13 0AS, UK
For information call 1-800-255-8522 / 1-303-530-2300
Made in USA
Printed in USA
©2008 Valleylab All rights reserved.
Caution
Federal (USA) law restricts this device to sale by or on the order of a physician.
5,776,130 6,228,083 6,682,528
5,599,344 6,277,117 6,685,701
5,720,744 6,398,779 6,726,686
5,827,271 6,402,743 6,743,229
6,033,399 6,451,018 D-424,694
6,039,733 6,464,704 D-425,201
6,050,996 6,458,130 D-449,886
6,068,627 6,511,480 D-457,958
6,179,834 6,585,735 D-457,959
0086
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LigaSure Vessel Sealing Generator Service Manual iii
Preface
The service manual describes the Valleylab LigaSure vessel sealing generator:
• Descriptions of the system, its functions, specifications, and theory of
operation
• Step-by-step instructions on how to set up, calibrate, troubleshoot, and
maintain the system
• Step-by-step instructions on how to replace specific components
• Parts lists and schematics.
Conventions Used in this Guide
Warning
Indicates a potentially hazardous situation which, if not avoided, could result in
death or serious injury.
Caution
Indicates a hazardous situation which, if not avoided, may result in minor or
moderate injury.
Notice
Indicates a hazard which may result in product damage.
Important
Indicates an operating tip or maintenance suggestion.
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iv LigaSure Vessel Sealing Generator Service Manual
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LigaSure Vessel Sealing Generator Service Manual v
Preface iii
Conventions Used in this Guide iii
Chapter 1. Service Personnel Safety
Safety Information 1-2
Warnings, Cautions, and Notices 1-2
General 1-2
Active Accessories 1-3
Fire/Explosion Hazards 1-3
Electric Shock Hazards 1-3
Servicing 1-4
Calibration 1-5
Cleaning 1-5
Chapter 2. Introduction
General Description 2-2
Vessel Sealing 2-2
Bipolar Operation 2-3
Instant Response Technology 2-3
Chapter 3. Controls, Indicators, and Receptacles
List of Components 3-2
Front Panel 3-3
Features 3-4
Symbols 3-4
Vessel Sealing Controls and Indicators 3-5
Vessel Sealing Handset Receptacle (purple) 3-6
Bipolar Controls and Indicators 3-6
Bipolar Handset Receptacle (blue) 3-7
Rear Panel 3-8
Vessel Sealing Footswitch Receptacle (purple) 3-9
Bipolar Footswitch Receptacle (blue) 3-9
Option Panel 3-10
Chapter 4. Technical Specifications
Performance Characteristics 4-2
General 4-2
Dimensions and Weight 4-2
Operating Parameters 4-2
Transport and Storage 4-3
Duty Cycle 4-3
Internal Memory 4-3
Audio Volume 4-3
Serial Port 4-4
RF Activation Port 4-5
Expansion Port 4-5
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vi LigaSure Vessel Sealing Generator Service Manual
Low Frequency (50-60 Hz) Leakage Current (AAMI HF-18-1993) 4-6
High Frequency (RF) Leakage Current (IEC 60601-2-2) 4-6
Input Power 4-7
Power Cord Specification 4-7
Standards and IEC Classifications 4-8
Class I Equipment (IEC 60601-1) 4-8
Type CF Equipment (IEC 60601-1)/Defibrillator Proof 4-9
Liquid Spillage (IEC 60601-2-2, clause 44.3) 4-9
Static Electricity Discharge Interference (IEC 60601-1-2 and IEC 61000-4-2) 4-9
Electromagnetic Interference 4-9
Electromagnetic Compatibility (IEC 60601-1-2 and
IEC 60601-2-2) 4-9
Voltage Transients (Emergency Generator Mains Transfer) 4-10
Output Characteristics 4-14
Maximum Generator Output 4-14
Output Waveform 4-15
Output Power vs. Impedance Graphs 4-17
Chapter 5. Principles of Operation
Block Diagram 5-2
Functional Overview 5-3
Vessel Sealing 5-3
Bipolar Operation 5-3
Instant Response Technology 5-3
Control Board 5-4
Microcontrollers 5-4
Feedback Microcontroller 5-5
Feedback Microcontroller Memory 5-5
Shared RAM 5-6
I/0 Expansion 5-6
Keyboard Interface and Activation Inputs 5-6
Power Supply Supervisor Circuit 5-6
A/D and D/A Conversion 5-7
Waveform Generation (T_ON) 5-7
T_ON Average Check 5-7
Audio Alarm 5-8
Serial Interface 5-8
Dosage Error Algorithm 5-8
Instant Response Algorithm 5-9
Front Panel 5-10
Membrane Keyboard 5-10
Power Switch 5-10
Display Board 5-10
RF Indicator Lamps 5-10
LED and Seven-Segment Display Drivers 5-11
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LigaSure Vessel Sealing Generator Service Manual vii
Regrasp Display 5-12
Mode Select and Power Control Switches 5-12
Footswitch Board 5-13
Footswitch Decode Circuit 5-13
Audio Circuit 5-14
High Voltage (HV) Power Supply Board 5-15
Power Entry Circuit 5-15
Auto Mains Switching Circuitry 5-15
AC/DC Converter 5-15
DC/DC Switching Regulator 5-16
Thermal Sensing (High Temperature Limit) 5-17
Low Voltage Power Supply 5-17
RF Board 5-18
Operative Modes 5-19
RF Driver 5-20
RF Output 5-20
RF Output Relays 5-21
EKG Output Relay 5-21
Primary Sense Circuits 5-22
Redundant Sense Circuits 5-23
Single Fault Protection Circuit 5-24
Heat Sink 5-25
IsoBloc Circuit 5-25
Integration Functions 5-26
Smart Connector Boards 5-28
Chapter 6. Setup, Tests, and Adjustments
Setting Up the Generator 6-2
Connecting Bipolar or Macrobipolar Accessories 6-3
Setting the Output for the Selected Mode 6-4
Activating the Surgical Instrument 6-4
Periodic Safety Check 6-5
Recommended Test Equipment 6-5
Inspecting the Generator and Accessories 6-6
Equipment 6-6
Procedure 6-6
Inspecting Internal Components 6-8
Equipment 6-8
Procedure 6-8
Using the RS-232 Serial Port 6-9
Equipment 6-9
Disconnect the Computer from the Generator 6-11
Testing the Generator 6-11
Confirming Outputs 6-11
Checking the Vessel Sealing Output 6-12
Checking the Bipolar Output 6-12
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viii LigaSure Vessel Sealing Generator Service Manual
Checking Low Frequency Leakage Current and Ground Resistance 6-13
Checking High Frequency Leakage Current and Ground Resistance 6-14
Calibrating the LigaSure Generator 6-16
Preparing for Calibration 6-17
Chapter 7. Troubleshooting
Inspecting the Generator 7-2
Inspecting Receptacles 7-2
Inspecting Internal Components 7-4
Correcting Malfunctions 7-5
Responding to System Alarms 7-10
Chapter 8. Replacement Procedures
Safety 8-2
Map of Major Components 8-3
Cover 8-4
Tools Needed 8-4
Remove the Cover 8-4
Re-install the Cover 8-5
High Voltage (HV) Power Supply Board 8-5
Tools Needed 8-5
Remove the High Voltage Power Supply Board 8-5
Install a New HV Power Supply Board 8-7
Control Board and Battery 8-9
Tools Needed 8-9
Remove the Control Board 8-9
Replacing the Battery 8-11
Tools Needed 8-11
Procedure 8-11
Install the Control Board 8-12
Footswitch Board 8-13
Tools Needed 8-13
Remove the Footswitch Board 8-13
Install a New Footswitch Board 8-13
Low Voltage (LV) Power Supply Board 8-15
Tools Needed 8-15
Remove the Low Voltage (LV) Power Supply Board 8-15
Install a New LV power supply board 8-16
Front Panel and Display Board 8-17
Tools Needed 8-17
Remove the front panel 8-17
Remove the Display Board 8-19
Install the Display Board 8-20
Install the Front Panel 8-20
Power Switch 8-22
Tools Needed 8-22
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LigaSure Vessel Sealing Generator Service Manual ix
Remove the Power Switch 8-22
Install a New Power Switch 8-24
RF Board and Heat Sink 8-25
Tools Needed 8-25
Remove the RF board 8-25
Remove the Heat Sink 8-28
Install the Heat Sink 8-28
Install the RF Board 8-29
Power Entry Module 8-30
Tools Needed 8-30
Remove the Power Entry Module 8-30
Install the Power Entry Module 8-31
Fuses 8-32
Tools Needed 8-32
Two Fuses in the Fuse Drawer 8-32
Three Fuses on the RF Board 8-33
One Fuse on the HV Power Supply Board 8-33
Chapter 9. Repair Policy
Responsibility of the Manufacturer 9-2
Returning the Generator for Service 9-2
Returning Circuit Boards 9-4
Service Centers 9-4
Chapter 10. Service Parts
Ordering Replacement Parts 10-2
Map of Major Components 10-2
List of Parts 10-3
Assembly, Box 10-3
Generator Assemblies 10-4
Front Panel Assembly 10-5
High Voltage Power Supply Board Assembly 10-6
RF Board Assembly 10-7
Control Board Assembly 10-8
Chapter 11. Warranty
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xLigaSure Vessel Sealing Generator Service Manual
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CHAPTER
1
LigaSure Vessel Sealing Generator Service Manual 1-1
1Service Personnel Safety
Valleylab stresses safety in the use and servicing of its
electrosurgical equipment. This chapter presents the following:
• Safety information
• Warnings, Cautions, and Notices
Refer to the Preface, Conventions Used In This Guide, for further
information on Warnings, Cautions, and Notices.
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Safety Information
1-2 LigaSure Vessel Sealing Generator Service Manual
Safety Information
The safe and effective servicing of electrosurgical equipment depends to a large
degree on factors solely under the control of the service person. There is no
substitute for a properly trained and vigilant service staff.
Warnings, Cautions, and Notices
Before servicing the generator, it is important that you read, understand, and
follow the instructions supplied with it and with any other equipment used to
install, test, adjust, or repair the generator.
General
Warning
Use the generator only if the self-test has been completed as described.
Otherwise, inaccurate power outputs may result.
The instrument receptacles on this generator incorporate a smart interface. They
operate with Valleylab LigaSure handsets or smart connector adapters exhibiting
smart codes.
Caution
Do not stack equipment on top of the generator or place the generator on top of
electrical equipment. These configurations are unstable and/or do not allow for
adequate cooling.
Provide as much distance as possible between the electrosurgical generator and
other electronic equipment (such as monitors). An activated electrosurgical
generator may cause interference with them.
Do not turn the activation tone down to an inaudible level. The activation tone
alerts the surgical team when an accessory is active.
Notice
If required by local codes, connect the generator to the hospital equalization
connector with an equipotential cable.
Connect the power cord to a wall receptacle having the correct voltage.
Otherwise, product damage may result.
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Warnings, Cautions, and Notices
Service Personnel Safety
LigaSure Vessel Sealing Generator Service Manual 1-3
Active Accessories
Fire/Explosion Hazards
Electric Shock Hazards
Warning
Electric Shock Hazard Do not connect wet accessories to the generator.
Electric Shock Hazard Ensure that all accessories and adapters are correctly
connected and that no metal is exposed.
Caution
Connect accessories to the proper receptacle type. In particular, connect bipolar
accessories to the bipolar instrument receptacle only. Connect vessel sealing
accessories to the LigaSure seal receptacle only.
Notice
Do not activate the generator until the forceps have made contact with the
patient. Product damage may occur.
Warning
Danger: Explosion Hazard Do not use the generator in the presence of
flammable anesthetics, gases, liquids, or objects.
Fire Hazard Do not place active accessories near or in contact with flammable
materials (such as gauze or surgical drapes). Electrosurgical accessories that
are activated or hot from use can cause a fire. Use a holster to hold
electrosurgical accessories safely away from personnel and flammable materials.
Fire Hazard Do not use extension cords.
Fire Hazard For continued protection against fire hazard, replace fuses only with
fuses of the same type and rating as the original fuse.
Warning
Connect the generator power cord to a properly grounded receptacle. Do not use
power plug adapters.
Do not connect a wet power cord to the generator or to the wall receptacle.
Disconnect the power cord before servicing the generator. To allow stored energy
to dissipate after power is disconnected, wait at least five minutes before
replacing parts.
Always turn off and unplug the generator before cleaning.
Do not touch any exposed wiring or conductive surfaces while the generator is
disassembled and energized. Never wear a grounding strap when working on an
energized generator.
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Warnings, Cautions, and Notices
1-4 LigaSure Vessel Sealing Generator Service Manual
Servicing
When taking measurements or troubleshooting the generator, take appropriate
precautions, such as using isolated tools and equipment, using the “one hand
rule,’ etc.
Potentially lethal AC and DC voltages are present in the AC line circuitry, high
voltage DC circuitry, and associated mounting and heat sink hardware described
in this manual. They are not isolated from the AC line. Take appropriate
precautions when testing and troubleshooting this area of the generator.
High frequency, high voltage signals that can cause severe burns are present in
the RF output stage described in this manual. Take appropriate precautions when
testing and troubleshooting this area of the generator.
Caution
Read all warnings, cautions, and instructions provided with the Valleylab
LigaSure electrosurgical generator before servicing.
The generator contains electrostatic-sensitive components. When repairing the
generator, work at a static-control workstation. Wear a grounding strap when
handling electrostatic-sensitive components, except when working on an
energized generator. Handle circuit boards by their nonconductive edges. Use an
antistatic container for transport of electrostatic-sensitive components and circuit
boards.
Warning
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Warnings, Cautions, and Notices
Service Personnel Safety
LigaSure Vessel Sealing Generator Service Manual 1-5
Calibration
Cleaning
Caution
To avoid inadvertent coupling and/or shunting of RF currents around the resistor
elements, keep the resistors at least four inches (10.2 cm) away from any metal
surface including tabletops and other resistors. This is especially true if several
resistors are connected in series or parallel to obtain a specified value. Do not
allow the resistor bodies to touch each other.
Notice
After calibration, the generator will be ready to use only after you initiate the
internal self-test by turning the generator off, then on.
Calibrate the generator after you install a new battery. Calibration values are lost
when the battery is replaced.
Calibrate the generator after you install a new control board.
Calibrate the generator after you service, repair, or install new components, or
after you replace any generator board assembly.
Notice
Do not clean the generator with abrasive cleaning or disinfectant compounds,
solvents, or other materials that could scratch the panels or damage the
generator.
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1-6 LigaSure Vessel Sealing Generator Service Manual
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CHAPTER
2
LigaSure Vessel Sealing Generator Service Manual 2-1
2Introduction
This chapter introduces the system features:
• General description
• Vessel sealing
• Bipolar operation
• Instant Response technology
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General Description
2-2 LigaSure Vessel Sealing Generator Service Manual
General Description
The LigaSure vessel sealing system is an isolated output electrosurgical generator
that provides power for vessel sealing and bipolar surgery.
It includes the following features:
• LigaSure vessel sealing technology
• Vessel sealing regrasp indicator alerts you to situations where a full seal cycle
has not been achieved
• Bipolar and macrobipolar modes
• Instant Response technology
• Memory button to recall the most recently used intensity and power settings
• Smart interface for connecting a Valleylab LigaSure handset or smart
connector adapter
• Adjustable volume for the activation tone
• Handswitch or footswitch activation
• RF activation port, RS-232 serial port, and expansion port
Vessel Sealing
The LigaSure vessel sealing system provides precise energy delivery and
electrode pressure to vessels for a controlled time period to achieve a complete
and permanent fusion of the vessel lumen. This system works on isolated arteries
and veins up to and including 7 mm in diameter and tissue bundles. The system
has been optimized to produce minimal sticking, charring, or thermal spread to
adjacent tissue.
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Bipolar Operation
Introduction
LigaSure Vessel Sealing Generator Service Manual 2-3
Bipolar Operation
Two modes are available:
• Bipolar – for most applications. The system provides low voltage to prevent
sparking. The power remains constant over a specific range of tissue
impedance, allowing a consistent tissue effect.
• Macrobipolar – for bipolar cutting or rapid coagulation. The system provides
higher voltage and greater power than with the bipolar mode.
Instant Response Technology
The LigaSure generator automatically senses tissue impedance and adjusts the
output to maintain a consistent effect across different tissue types. This
adjustment is based on the power setting and the level of tissue impedance. The
system controls maximum output voltage to reduce tissue damage and to
minimize sparking.
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