VideoPath VLX-20 Light Source Operating Manual Rev C

Thank you for purchasing the Welch Allyn VideoPath VLX-20 Light Source. The operating and maintenance instructions found in this manual should be followed to ensure many years of reliable service. Please read these instructions thoroughly before attempting to use your new VLX-20 Light Source. This device serves as a light and air/water source for the Welch Allyn VideoPath System and can be used with any compatible Welch Allyn videoscope. IMPORTANT: The material outlined in this manual should be reviewed and understood prior to operation of the equipment. CAUTION: Federal Law restricts this device to sale by/to or on the order of a physician or other appropriately licensed medical professional. WARNING: The user of this equipment should be thoroughly trained in the medical procedures appropriate to the instrumentation. Furthermore, time should be taken to read and understand these instructions before performing any procedures. Instructions for other equipment used in conjunction (e.g., suction machines, electrosurgery generators) should also be read and understood. Failure to do so may result in injury to the patient and/or damage to the instrument. The CE mark on this device indicates it has been tested to and conforms with the provisions noted within the 93/42/EEC Medical Devices Directive. Authorized European Representative Address: European Regulatory Manager Welch Allyn, Ltd. Kells Road, Navan, County Meath, Republic of Ireland Tel.: 353-46-79060 Fax: 353-46-27128

Table of Contents Conventions General Precautions...2 Symbols ...3

Specifications ...4 Components ...5 VLX-20 Light Source ...5 Optional Accessories ...5

Nomenclature Light Source Front Panel...6 Light Source Bottom View ...7 Water Bottle/Cleaning Bottle ...7 Light Source Back View...8 Monitor...9-10

Connection Diagrams ...11 Preparation For Use General Precautions...12 Setting Up the VLX-20 Light Source ...13 Connecting the VideoEndoscope and Water Bottle ...13-14

Inspection Powering Up the Light Source...14 Lamp Ignition ...15 Inspection of Illumination...15-16 Inspection of Endoscope Control Buttons ...16 Inspection of Air/Water Feed ...16

Operation Power Switch...17 Lamp Ignition ...17 Illumination Brightness ...17 Air Pump ...17 Video Printer ...18 Electrosurgery...18

Maintenance and Storage After Each Procedure ...19 Water Bottle Cleaning...19 Enzymatic Solutions ...19 Water Bottle Sterilization ...20 ETO Sterilization...20 Cold Sterilization...21 Sterilizing/Disinfecting Solutions...21 Bottle Storage...21 Replacing Lamps...22-23 Light Source Storage...24

Troubleshooting ...25-26

VLX-20 Light Source

1

Conventions WARNING: Alerts the user to possible serious injury, death or other adverse reaction associated with the use or misuse of the device. CAUTION: Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. It also alerts against unsafe practices. NOTE: Provides supplemental information to the text and indicates a potentially hazardous situation, which, if not avoided, may result in property damage. Additionally it highlights important information on the use of this equipment.

General Precautions • For safety, this light source should only be coupled to a grounded 100-240V AC outlet. • The light source should not be operated in the presence of flammable or explosive gases or chemicals or installed in areas where these materials are commonly utilized. • To avoid overheating, the light source should be positioned on a hard, level surface and the back of the light source should not be positioned closer than 6" to any wall. • Keep all liquids away from electrical equipment to avoid the possibility of operator shock and instrument damage. • Occasionally inspect the power cord for signs of cuts, abrasions or dents. • The light source should never be stored or operated in areas where it could get wet or exposed to any environmental conditions such as extreme temperature, humidity, direct sunlight, dust, etc. • All service to the light source must be performed by Welch Allyn or an authorized repair center. • Light source use should adhere to the operating conditions found in this manual. Otherwise, instrument damage may occur and/or operator/patient safety compromised. • High frequency surgical equipment used with the endoscope must comply with the IEC 601-2-2, Particular Requirements for the Safety of High Frequency Surgical Equipment. NOTE: This device complies with current required standards for electromagnetic interference and should not present problems to other equipment or be affected by other devices. As a precaution, avoid using this device in close proximity to other equipment.

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Conventions (Continued) Symbols POWER

Off: (Power: disconnects from the mains) POWER

On: (Power: connects to the mains) AIR

Off: (Power for air switch) AIR

On: (Power for air switch)

Attention: Consult user’s manual for additional information Dangerous voltage: Electric shock hazard due to high internal voltage. There are no user serviceable parts inside the light source.

Protective earth (ground)

Risk of Explosion: Possible risk of explosion hazard if used in presence of flammable anesthetics.

Caution High Temperatures

Warning: Risk of fire, replace fuses as marked

Caution: High Intensity Light

Equipotentiality

VLX-20 Light Source

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Specifications Item

Specification

Technical Data

Power Requirements

Voltage Frequency Current

100-240VAC 50/60Hz 2.0 Amps Max.

Operating Mode

Continuous

Dimensions

HxWxD Weight

Operating Environment

4

Ambient Temperature

7 x 17 x16-1/2 (18 x 43 x 42cm) 15.0 lbs. (6.8 kg)

Relative Humidity Atmospheric Pressure

+10° C (50° F) to +40°C (104° F) 30-75% 700 hPa to 1060 hPa

Transport/Storage

Ambient Temperature Relative Humidity Atmospheric Pressure

-20° C to +49° C 95% Max. 700hPa to 1060 hPa

Illumination

Lamp Type Lamp Life (average) Brightness Adjustment Cooling Method

Metal Halide Arc 750 hrs @ 1 hr per start Automatic Shutter Forced Air

Air Feeding

Pump Type Capacity Flow Rate Control

Linear Motor, Free Piston 6.5 PSIG Maximum .177 c.f.m. @ 2.84 PSIG Power switch activated

Water Feed System

Water Compression Watter Bottle Capacity

Pressurized by pumped air 260 ml

Compatible Endoscopes

Welch Allyn VideoEndoscopes

Color CCD only

Other Manufacturer’s Fiberscopes

All models with use of light source adapter module

Color System

Color mosaic CCD

Video Outputs

Dual Composite (NTSC) Dual S-Video

Output Devices

VCR Monitor Thermal or Video Printer

Compliance

Designed in Accordance

UL 2601-1, IEC 60601-2-18, IEC 60601-1, CSA C22.2 No. 601.1, CE

Degree of explosion proofing

Use in potentially flammable surroundings prohibited

Classification

Electro medical equipment Degree of protection against electrical shock

Class I Equipment Use on heart is prohibited

Fuse

T2.0A-250V

Lamp

Welch Allyn Part No. 04060

Lamp Voltage 60 Volts

VideoPath

Components VLX-20 Light Source Includes: 2

LAMP IGNITION

45500

Light Source

45510

Water Bottle

761076-0

Power Cord

45512

S-Video Cable

45520

Cleaning/Disinfection Bottle

04060

Lamp Replacement Assembly

65158

RS-232 Communication Cable

45513

NTSC Composite Video Cable

33915

Electrosurgical Ground Kit

!

STANDBY

POWER

AIR

LAMP SERVICE

PICTURE BRIGHTNESS

Optional Accessories

VLX-20 Light Source

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Nomenclature Light Source Front Panel 6. Endoscope Connector Port

2

3. Lamp Ignition 4. Lamp Standby Indicator

8. Air Output Port

LAMP IGNITION

!

STANDBY

POWER

AIR

LAMP SERVICE

PICTURE BRIGHTNESS

1. Main Power Switch

5. Picture Brightness Control

2. Air Pump Switch

7. Water Bottle

Front Panel

6

Name 1. Main Power Switch

Function Primary power control for the light source. If not activated, other controls will not function.

2. Air Pump Switch

Activates flow of air at air output port in endoscope connector port.

3. Lamp Ignition

Ignites and activates the lamps.

4. Lamp Standby Indicator

When LED blinks, lamps cannot be ignited. When LED remains on, lamps have warmed up/cooled down and can be ignited.

5. Picture Brightness Control

Pressing up or down arrows adjusts image on monitor to desired brightness level (level indicated by illuminated green LED)

6. Endoscope Connector Port

Accepts endoscope connector terminal to transmit light and electrical signals through the endoscope.

7. Water Bottle

Water bottle couples to endoscope connector terminal’s air and water input ports and light source air output port.

8. Air Output Port

Couples to and pressurizes the water bottle which provides air and water to the endoscope.

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Nomenclature (Continued) Light Source Bottom View

9. Lamp Access Door

10. Ventilation Holes

Light Source Bottom View

Name 9. Lamp Access Door

Function Opens for lamp replacement. (Note: If door is not properly closed, interlock power switch will deactivate and the unit will not power up.)

10. Ventilation Holes

Allows air to enter unit to cool internal components.

Water Bottle/Cleaning Bottle 11. Air Input Connector

12. Air Output Connector 13. Water Output Connector

Name 11. Air Input Connector

Function Couples to light source air output port.

12. Air Output Connector

Couples to endoscope air input port.

13. Water Output Connector Couples to endoscope water input port. 14. Fill Line 14. Fill Line

Indicates maximum water level to which bottle should be filled for normal use.

Water Bottle NOTE: Cleaning bottle is identical to water bottle with the exception that it allows fluid to be introduced into the air input port of the endoscope. The bottle can be easily identified via the red CAUTION label on the front of the bottle.

VLX-20 Light Source

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Nomenclature (Continued) Light Source Back View 18. Fans 19. Fuse Drawer

23. Auxilliary Port 16. S-video Output 17. Composite Video Output

20. Earth Ground Terminal Connector

22. RS-232 Communication Connector Port 21. Equipotentiality Terminal Connector

15. Power Supply Cord Receptacle

Light Source Back View

8

Name 15. Power Supply Cord Receptacle

Function Couples with power cord which should be plugged into a 100-240 VAC outlet.

16. S-video Outputs

Outputs S-video or Y/C, 4 position Mini-DIN.

17. Composite Video Outputs

Outputs NTSC (composite video), BNC connector.

18. Fans

Pulls room air into the light source for forced air cooling.

19. Fuse Drawer

Opens for replacement of main fuse.

20. Earth Ground Terminal Connector

Provides a terminal which is connected to earth ground through the VLX-20 line cord (1/4-36 UNS-2A thread).

21. Equipotentiality Terminal Connector

Accepts ground connector from electrosurgery equipment to provide a secondary or redundant ground path.

22. RS-232 Communication Connector Port

Communication port for use with video printers.

23. Aux(illiary) Port

No function. Future capability.

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Nomenclature (Continued) Monitor NOTE: The following is a brief overview of the nomenclature of the SONY PVM-1350 Video Monitor. For detailed instructions, please refer to the Operation Manual that is provided by the manufacturer. PLEASE REFERENCE YOUR SONY MONITOR MANUAL ENCLOSED FOR FURTHER INFORMATION.

Front Panel of Monitor

32. Input select buttons

24. Power 31. Degauss

30. Aperture 29. Bright 28. Chroma

25. Volume 26. Contrast 27. Phase

Name 24. Power

Function Depress to turn the monitor on. The indicator will light up in green.

25. Volume

No function.

26. Contrast

Turn clockwise to increase contrast and counterclockwise to decrease.

27. Phase (Tint)

Turn clockwise to make the skin tones green and counterclockwise to make them purple.

28. Chroma

Turn clockwise to make the color intensity higher and counterclockwise to make it lower.

29. Bright (Brightness)

Turn clockwise for more brightness and counterclockwise for less.

30. Aperture (Sharpness)Turn clockwise for more sharpness and counterclockwise for less. 31. Degauss button

Press this button momentarily. The screen will be demagnetized. Wait for 10 minutes or more before activating this button again.

32. Input select buttons Press (light on) to select the program to be monitored. A: For signal fed through the LINE A connectors. B: For signal fed through the LINE B connectors. C: For signal fed through the LINE C connectors. RGB: For signal fed through the RGB connectors.

VLX-20 Light Source

9

Nomenclature (Continued) Back Panel of Monitor

33. Power Supply Cord Receptacle

34. Line A, Line B connectors

35. Line C connector

Name 33. Power Supply Cord Receptacle

Function Couples with power cord, which should be plugged into a 100-240 VAC outlet.

34. Line A, Line B connectors

Two groups (A and B) of line input connectors for composite video.

35. Line C connector Y/C IN (S-Video) High resolution S-Video input.

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Connection Diagrams Connecting the VLX-20 with Monitor The diagram below illustrates an example of recommended coupling between the VLX-20 and a monitor. Line C Y/C In VLX-20

S-Video Out

Monitor

Connection to monitor diagram

Connecting the VLX-20 with VCR/Video Printer The diagram below illustrates an example of recommended coupling between the VLX-20 and peripheral equipment. S-Video In VLX-20

S-Video Out

S-Video Out

S-Video In Monitor

Connection of the VLX-20 with VCR/Video Printer WARNING: All video monitors and peripheral equipment used with this system must be IEC 60601-1 or UL 2601-1 listed to comply with medical electrical safety guidelines. If not IEC 60601-1, UL 2601-1 listed, the monitor/peripheral equipment should be positioned outside of the 6 foot patient contact area. Please contact Welch Allyn for more information. NOTE: The RS-232 cable is required for the Function Control Buttons to perform properly.

VLX-20 Light Source

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Preparation For Use General Precautions • Make sure the cabinet of this unit is always grounded and secure during use. Do not disable line cord ground connection. Grounding reliability is achieved only when light source is connected to “hospital-use” or “hospital-grade” receptacle. Inspect the electrical plug and cord routinely. Do not use if damage is discovered. • Do not use the light source in the presence of any flammable anesthetics. • Do not open the light source cabinet. There is an electrical shock hazard due to the high internal voltage.There are no user serviceable parts inside the light source. NOTE: Opening of the light source cabinet by a non-authorized repair facility will void the product warranty. WARNING: Total system risk current should not exceed 50uA. An isolation transformer is required if the total system risk current exceeds 50uA when accessories are interconnected. CAUTION: The light source is cooled via two vent fans located in the back of the unit. These fans draw air from beneath the light source through the inside and out the back and through the endoscope connector port. Verify the rear of the unit is no less than 6" from a wall and that the source is placed on a hard surface. • When possible, keep the light source out of patient field. Always remove the light source from patient field while connecting or disconnecting endoscope or proximal camera system. CAUTION: To ensure patient safety, make sure monitor is outside patient vicinity (6 feet) during use. CAUTION: High frequency surgical equipment used with the endoscope must comply with the IEC 60601-2-2, Particular Requirements for the Safety of High Frequency Surgical Equipment. CAUTION: The chassis of the high frequency surgical equipment, if accessible, should be connected to the Equipotentiality Terminal of the VLX-20 Light Source to eliminate the potential of RF voltage potential between the two devices during electrosurgery. CAUTION: Before use, inspect the insulation of all endoscopic accessories designed for high frequency electrosurgery by consulting the manufacturer instructions for these devices. NOTE: The Welch Allyn Endoscopes are Type BF and do not require electrical connection between the endoscopes and the neutral electrode of the high frequency generator during electrosurgery. WARNING: If during a procedure, loss of function of the light source occurs, terminate the procedure. Return all deflection controls of the endoscope to the neutral position and disengage all control brakes. Slowly withdraw the endoscope from the patient. DO NOT operate the controls during withdrawal.

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Preparation For Use Setting Up the VLX-20 Light Source 1. Place the VLX-20 light source onto a hard, stable surface (shelf, counter, cart, etc.) and connect the power cord to the power supply cord receptacle located on the rear panel of the unit. After making sure the main power switch is off, couple the remaining end of the power cord into a properly grounded AC outlet. NOTE: The VLX-20 should not be placed in areas where: • it will be exposed to fluids. • it will be exposed to flammable gases. • the vent fans in the rear panel will be blocked. • the vent holes on the bottom of the unit will be blocked. WARNING: DO NOT use a converter adapter that will convert the three prong plug to a two prong. In this case the light source is not properly grounded and electric shock may result. NOTE: Place the light source in a horizontal position for operation. NOTE: If the light source is placed on a mobile cart verify that the cart is stable enough to support the unit.

Connecting the VideoEndoscope and Water Bottle WARNING: It is essential that the instruction manuals for the Welch Allyn VideoEndoscopes be reviewed in detail prior to using the system. 1. Fill the water bottle with clean water to the fill line indicated on the side of the bottle. Remember to: • Change the water daily. • Use distilled or sterile water to prevent mineral and organic deposits in the water lines. • If water leaks from the bottle into the light source, a drain in the base of the endoscope connector port will direct the water to the table top where it can be wiped up. 2. Verify that the light source’s main power switch is off. Plug the endoscope connector terminal into the light source’s endoscope connector port. Advance until the instrument clicks into place.

POWER LAMP N IO IGNIT

OFF

VLX-20 Light Source

TURE PIC NESS HT

LAMP ICE SERV

BRIG

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Preparation For Use (Continued) 3. Insert the water bottle into the recessed area (endoscope connector port) on the front panel of the light source. The bottle’s air and water connectors should couple to the air output port of the light source and air and water input ports on the endoscope connector terminal. Push water bottle until the front of the bottle is flush with the front panel of the light box.

VLX-20

LAMP N IGNITIO

BY

STAND

LAMP E SERVIC

E PICTUR SS TNE BRIGH

Inspection Prior to every examination, the equipment should be pre-tested following the procedures outlined in the following sections. If an abnormality is detected or suspected, do not continue with the examination. Contact Welch Allyn Customer Service for assistance at 1-800-535-6663.

Powering Up the Light Source 1. With the instrument coupled to the light source, activate the power switch on the light source’s front panel. The internal cooling fans will power up and should be heard running. The green LED Lamp Ignition/Standby light will blink for approximately 11 seconds to allow the lamps to warm up (or if the light source has been on for an extended period of time, to allow the lamps to cool down). NOTE: If the light source does not appear to power up, make sure that the power cord is correctly connected, the lamp door cover on the bottom of the unit is securely closed and the endoscope connector terminal is correctly engaged in the endoscope connector port. If the unit still does not power up, contact Welch Allyn Customer Service at 1-800-535-6663.

2

Lamp Ignition Standby Light BLINKING

LAMP IGNITION

STANDBY

POWER

Power Switch ON

14

AIR

LAMP SERVICE

PICTURE BRIGHTNESS

VideoPath

Inspection Lamp Ignition 1. When the sigmoidoscope is connected to the light source and the main power switch is activated, the green Ignition/Standby light will blink for approximately 11 seconds. Once the green LED stops blinking, the lamps are ready to ignite. 2. Once the green Lamp Ignition/Standby light remains lit, press the Lamp Ignition Switch. The lamps will ignite and the Lamp Ignition/Standby light will go out. The lamps require 11 seconds to warm up. This length of time will be indicated by the center LED of the Picture Brightness Indicator which blinks until the lamps reach full intensity. Once the Picture Brightness Indicator remains constant, the lamps are fully warmed up, and the system is ready for use.

Center LED

PICTURE BRIGHTNESS

NOTE: If the light source is powered up without the endoscope plugged in, the center LED in the Brightness Indicator Panel will not illuminate, and the lamps will not ignite. The Standby light will continually blink. WARNING: If the endoscope is removed from the light source, the lamps will remain lit. DO NOT look directly into the lights. The intensity of the illumination may damage your eyes. If the instrument is removed from the light source, either turn off the main power switch or press the Lamp Ignition/Standby switch to turn off the lamps and put them in a standby mode. NOTE: If the internal cooling fans are running and the lamp ignition switch is activated but no light is emitted from the distal tip of the endoscope, the lamps are not functioning. Refer to the Troubleshooting and/or Lamp Replacement sections in this manual.

Inspection of Illumination 1. Once you have verified that the endoscope is connected to the light source and the lamps are lit, check that a live image appears on the monitor. 2. Make sure the endoscope’s automatic iris is working properly. While watching the monitor, place the distal tip of the endoscope within 1 cm of the palm of your hand and then move it about 10 cm away from your palm. The image brightness on the monitor at both distances should be similar. Point the distal tip toward dim room lights. The light being emitted at the distal end should lower significantly depending on the ambient light levels in the room. Point the distal tip at your palm again to verify that light is being Standby Light emitted from the endoscope.

1 cm

LAMP IGNITION

STANDBY

LAMP SERVICE

PICTURE BRIGHTNESS

3. Press the Brightness Control switch (the up and down arrows). The LED light goes up/down one step with increased/decreased illumination light output. Continually depressing the switch causes the LED light to go up/down sequentially with increasing/decreasing light output until the maximum/minimum output is reached.

VLX-20 Light Source

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Inspection (Continued) • Once the maximum/minimum output is reached, pressing the switch does not cause any change. • Do not press the Brightness Control switch with a pointed or hard object. Damage could occur to the membrane covering.

Inspection of Endoscope Control Buttons 1. Check that the endoscope control buttons (F, C and V), positioned on the control body of the endoscope, each beep when pressed. Refer to the Video Printer section for use of these control buttons.

Inspection of Air/Water Feed 1. Turn on the air pump. Once activated, the sound of the air pump should be evident. 2. Test the Air and Water flow through the endoscope. First, cover the air venting hole on top of the Air/Water valve. This should deliver air at the distal end of the endoscope through the air nozzle. Submerge the distal end in water. Air flow will be demonstrated by a flow of bubbles.

Cover

Biopsy Seal

Testing the Air Flow

3. Remove the distal tip from the water and depress the Air/Water valve completely. Water should flow through the water nozzle at the distal tip of the endoscope. NOTE: Allow 5 seconds for the water lines within the instrument to fill.

Depress

Water Nozzle

NOTE: Before each use, the outer surface of the portions of the endoscope and any endoscopically-used accessories which are intended to be inserted into a patient should be checked to ensure there are no unintended rough surfaces, sharp edges or protrusions which may cause a safety hazard.

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Operation Power Switch With the endoscope connected to the light source, activate the power switch on the light source front panel. The green LED Lamp Ignition/Standby light will blink for approximately 11 seconds to allow the lamps to warm up (or if the light source has been on for an extended period of time, to allow the lamps to cool down). POWER

AIR LAMP IGNITION

Blinking

STANDBY

POWER

AIR

LAMP SERVICE

ON

PICTURE BRIGHTNESS

Lamp Ignition Once the green Lamp Ignition/Standby light remains lit, press the Lamp Ignition switch. The lamps will ignite and the Lamp Ignition/Standby light will go out. The lamps require 11 seconds to warm up. This length of time will be indicated by the center LED of the Picture Brightness Indicator, which blinks until the lamps reach full intensity. Once the Picture Brightness Indicator LED remains constant, the lamps are fully warmed up, and the system is ready for use. PICTURE BRIGHTNESS

NOTE: Allow the system a full 15-20 seconds to warm up before beginning a procedure or image color will be adversely affected. Center LED

NOTE: If the light source is powered up without the endoscope plugged in, the Standby light will continually blink, and the lamps cannot be ignited. Standby light will continually blink

LAMP IGNITION

STANDBY

POWER

AIR

LAMP SERVICE

PICTURE BRIGHTNESS

Image Brightness Picture Brightness: The average brightness of the image on the monitor can be manually adjusted. Press the Picture Brightness Control switch (the up and down arrows). The LED light goes up/down one step with increased/decreased Picture Brightness (viewed on the monitor). Continually depressing the button causes the LED light to go up/down sequentially with increasing/decreasing Picture Brightness until the maximum/minimum output is reached.

Air Pump AIR

Turn on the Air switch. ON

VLX-20 Light Source

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Operation (Continued) Video Printer The VS-200 VideoEndoscope, when used with the VLX-20 Light Source and compatible video printer, has the ability to capture, store and print endoscopic images. The function controls on the endoscope interface with the system for convenient control of the Freeze, Copy and Video features. The RS-232 Cable must be connected from the VLX-20 Light Source to the video printer for this feature to perform properly. Please refer to the Connection Diagrams section of this manual for further information. It is important that the user review and understand the instruction manuals associated with all the components of the system, including the VideoSigmoidoscope and video printer. To save and print an image, perform the following: F (Freeze) Button – Push to freeze an image. C (Copy) Button – Push to activate the print function. V (Video) Button – Push to return to the live image after completion of the print process. Returning to the live image prior to printing a frozen image will result in the loss of the frozen image. Please refer to the instruction manual of the video printer for more detailed instructions.

Electrosurgery The user must carefully read and understand all the instructions in the operating manuals supplied with the electrosurgical generator and associated accessories. All electrosurgical equipment must be thoroughly inspected prior to use. Only the user can determine if the condition of the electrosurgical generator and accessories is correct and safe for clinical use. 1. The electrosurgical accessories should be introduced through the VS-200 VideoSigmoidoscope in the same manner as described in the Biopsy Forceps section of the VS-200 Instruction Manual. Consult the VS-200 manual for further detail. 2. The active portion of the electrosurgical accessory should always be clearly visualized before applying electrical energy to the instrument. CAUTION: High frequency surgical equipment used with the endoscope must comply with the IEC 601-2-2, Particular Requirements for the Safety of High Frequency Surgical Equipment. CAUTION: The chassis of the high frequency surgical equipment, if accessible, should be connected to the Equipotentiality Terminal of the VLX-20 Light Source to eliminate the potential of RF voltage potential between the two devices during electrosurgery. CAUTION: Before use, inspect the insulation of all endoscopic accessories designed for high frequency electrosurgery. CAUTION: Avoid using high frequency surgical equipment where explosive gas concentrations may be in the area of use. NOTE: The maximum rated recurring peak voltage of the high frequency generator used with this endoscope for electrosurgery shall not exceed these limits. Cut Mode 1000 Volts peak Coagulation Burst Mode 2000 Volts peak Coagulation Spray Mode 3000 Volts peak

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