System 7550 Operators Manual Rev B

LIMITED WARRANTY For a period of two years following the date of delivery, CONMED Corporation warrants the CONMED System 7550™ Electrosurgical Generator against any defects in material or workmanship and will repair or replace (at CONMED’s option) the same without charge, provided that routine maintenance as specified in this manual has been performed using replacement parts approved by CONMED. This warranty is void if the product is used in a manner or for purposes other than intended.

© 2007 CONMED Corporation 525 French Road Utica, New York 13502 U.S.A.

U.S. Patent Numbers 4,437,464 - 4,569,345 - 4,617,927 - 4,727,874 - 4,848,335 - 4,961,739 - 5,152,762 5,626,575 and other patents pending. For Technical Service or Return Authorization Phone: 303-699-7600 / 1-800-552-0138 Extension 5274 Fax 303-699-1628 For Customer Service or to order parts phone: 1-800-448-6506 / 315-797-8375 / Fax 315-735-6235 or contact your CONMED Representative. European Authorized Representative MDSS GmbH Schiffgraben 41 D - 30175 Hannover Germany The revision level of this manual is specified by the highest revision letter found on either the inside front cover or enclosed errata pages (if any).

Manual Number 60-7551-ENG Rev. B Unit Serial Number_________________________________

Table of Contents & List of Illustrations

Section

Title

1.0

General Information ... 1-1

1.1 1.2 1.3 1.4 1.5

Page

Contents

Foreword ... 1-1 Important Information ... 1-1 Introduction ... 1-1 Major System Components ... 1-1 Basic System Operation ... 1-1

1.5.1 1.5.2 1.5.3 1.5.4 1.5.5 1.5.6 1.5.7 1.5.8

Argon Beam Coagulator (ABC®) ... 1-2 Monopolar Cut and Coag ... 1-2 Bipolar ... 1-2 Automatic Return Monitor (A.R.M.)... 1-2 Program Mode ... 1-3 Remote Power Control Mode ... 1-4 Simultaneous Activation ... 1-4 Default Settings... 1-4

2.1 2.2

Component Identifications and Description ... 2-1 Generator Assembly... 2-1

2.3

Mobile Storage Pedestal ... 2-2

2.0

2.2.1 2.2.2 2.3.1 2.3.2 2.3.3 2.3.4 2.3.5

3.0

System Components ... 2-1

Front ...2-1 Rear ...2-1 Front ...2-2 Rear ...2-2 Argon Gas Delivery System... 2-2 Bottom... 2-4 Accessories ... 2-4

Operation... 3-1

3.1 3.2 3.3

General Precautions ... 3-1 Moving and Positioning the System ... 3-6 Operating Procedures ... 3-6

3.4

Accessory Operating Procedures ... 3-12

3.3.1 3.3.2 3.3.3 3.3.4 3.3.5 3.3.6 3.3.7 3.3.8 3.3.9 3.3.10 3.3.11

Verify Argon Gas for the ABC ... 3-6 Connect the Desired Footswitches ... 3-7 Connect the Return Electrode Cable and Return Electrode ... 3-7 In Case of Difficulty ... 3-8 Single Foil Alarm ... 3-8 Dual Foil Alarm ... 3-8 Setting Up the Argon Beam Coagulator (ABC®) ... 3-8 Setting Up Monopolar Cut and Coag ... 3-10 Setting Up Bipolar ... 3-11 Program Mode ... 3-11 Remote Power Control Mode ... 3-11

Section

Title

Page

3.4.1

ABC® Section Operational Precautions and Surgical Technique Guidelines ... 3-12

3.5 3.6 3.7

Routine System Turn Off... 3-15 Emergency System Turn Off ... 3-15 Environmental Protection ... 3-15

4.1 4.2

General ... 4-1 Operator Servicing and Cleaning ... 4-1

4.3

Troubleshooting Checklist ... 4-3

4.3.8

Fault Alarms ... 4-5

5.1

Specifications ... 5-1

5.3

Initial Inspection ... 5-8

5.4

Error Codes ... 5-10

4.0

4.2.1 4.2.2 4.2.3 4.2.4 4.3.1 4.3.2 4.3.3 4.3.4 4.3.5 4.3.7

5.0

5.1.1 5.1.2 5.1.3 5.1.4 5.1.5 5.1.6 5.1.7 5.1.8 5.1.9 5.1.10 5.2 5.3.1 5.3.2 5.3.3 5.4.1 5.4.2 Figure/Title

Operator Service ... 4-1

Cleaning External Surfaces ... 4-1 Installation and Removal of Argon Gas Cylinders ... 4-1 Installing the Cylinders ... 4-1 Removing the Cylinders ... 4-2 Power ...4-3 Modes ... 4-3 RF Output ... 4-4 Line Leakage ... 4-4 ABC Output ... 4-4 Accessories ... 4-5

Technical Information ... 5-1

General ... 5-1 Input Characteristics ... 5-1 Electrosurgical Unit Output Characteristics ... 5-1 Argon Beam Coagulator Output Characteristics... 5-2 RF Leakage* ... 5-2 Low Frequency ... 5-3 Gas Specification ... 5-3 Automatic Return Monitor ... 5-3 Environmental Conditions ... 5-3 Load Curves... 5-3 Explanation of Symbols... 5-7 Installation ... 5-8 Preliminary Checks ... 5-8 Preliminary Functional Testing for Installation ... 5-8 User Correctable Error Codes ... 5-10 If All Else Fails ... 5-10 Page

Figure 1.1 Major System Subassemblies ... 1-3 Figure 1.2 Independent System Sections ... 1-3 Figure 2.1 Generator Assembly Front ... 2-3 Figure 2.2 Generator Assembly Rear ... 2-3 Figure 2.3 Pedestal Front ... 2-3 Figure 2.4 Pedestal Rear ... 2-3 Figure 3.1 System Rear ... 3-6 Figure 4.1 Argon Gas Cylinder ... 4-2 Figure 4.2 Cylinder Installation ... 4-2

General Information Section 1.0

1.1

Foreword

This Operator’s Manual is designed to lead you step-by-step through the proper setup, operation, and user maintenance of the CONMED System 7550™ Electrosurgical Generator with Argon Beam Coagulation. System components, operational controls, and indicators are identified and explained.

1.2

Important Information

• Generator Assembly • Mobile Storage Pedestal Generator Assembly: The Generator Assembly houses the power supplies, power amplifiers, control circuits, logic circuits, and microprocessor circuits, as well as the control circuits and pneumatic devices for the argon gas delivery system. The Generator Assembly also contains the Control Panel and the Output Receptacle Bar for connection of Accessories.

This equipment is for use by qualified medical personnel only. Read the Operator’s Manual thoroughly before operating the CONMED System 7550™. Pay particular attention to the NOTES, CAUTIONS, and WARNINGS throughout this Manual to ensure safe operating conditions at all times. CONMED disclaims all liability for damage or injury caused as a result of improper use of this equipment.

Mobile Storage Pedestal: The required Mobile Storage Pedestal provides a permanent base and mobility for the Generator Assembly. The Mobile Storage Pedestal contains shelves for storage of footswitches and accessories, hoses and receptacles for the footswitch cables, and houses the Argon Gas Cylinders.

1.3

Electrosurgical generator systems are complex. A complete explanation of the theory of operation is beyond the scope of this Operator’s Manual. The following information is intended to provide an overview of basic aspects, sections, and components of the CONMED System 7550™ Electrosurgical Generator with Argon Beam Coagulation.

Introduction

The CONMED System 7550™ Electrosurgical Generator with Argon Beam Coagulation is a microprocessor-based, solid state, RF isolated electrosurgical generator. It is designed for enhanced control of bleeding and for the electrosurgical destruction of tissue in multispecialty procedures in the operating room or endoscopy suite. NOTE: RF isolated means that the outputs for RF accessories are not directly connected to ground or to the unit chassis. The CONMED System 7550™ combines conventional electrosurgical features (monopolar cut, monopolar coagulation and bipolar) with argon beam coagulation in a full-capability, mobile Electrosurgical System.

1.4

Major System Components

The CONMED System 7550™ Electrosurgical Generator with Argon Beam Coagulation consists of two major sub-assemblies integrated into one System (see Figure 1.1):

1.5

Basic System Operation

The basic components of the CONMED System 7550™ consist of a high voltage direct current (DC) power source which provides power for the RF generator amplifiers, a low voltage DC power source, a gas flow control system, and a microprocessor controller to oversee all generator operations. The CONMED System 7550™ consists of three independent sections combined into one System (Figure 1.2). Each section has Power Control Dials, Digital Power Displays, mode indicators, and activation indicators. The System is designed primarily for non-simultaneous, discrete (“first come, first served”) output to ensure that power is supplied to only one active accessory at a time. However, the CONMED System 7550™ also incorporates Simultaneous Activation.

1-1

Simultaneous Activation is a means of splitting the output power between two separate active electrodes, allowing both hand controls or one handcontrol with the foot control to be activated simultaneously in the Pinpoint or Spray mode. Simultaneous Activation is described in Section 1.5.7.

through tissue. An eschar temperature of approximately 100 degrees Celsius (212 degrees F) is produced during current passage through tissue.

1.5.1

Handpiece accessories for Argon Beam Coagulation combine a tube to carry the argon gas to the nozzle end of the handpiece and an internal wire to conduct the RF current. In the nozzle, a tungsten needle electrode is centrally positioned to permit a coaxial flow of argon gas. The needle electrode is slightly recessed to reduce the possibility of contact of the electrode with tissue.

Argon Beam Coagulator (ABC®)

The Argon Beam Coagulator (ABC®) provides one mode of monopolar operation - coagulation. CONMED provides a variety of ABC® handpiece accessories to conduct the RF current to the target tissue. These accessories include handswitching and footswitching models. A CONMED return electrode is required to return the RF current back to the generator. Argon Beam Coagulation technology uses a gentle, coaxial flow of argon gas to conduct RF current to the target tissue (instead of the conventional electrosurgical medium of air). The result is enhanced control and efficiency of coagulation. The ABC has two different modes, called Target Mode and Active Mode. The Target Mode is enabled anytime ABC is activated and the “beam” is not occurring. This mode is controlled internally to the system and is independent of the user settings. During the Target Mode, the system switches between two signals, each of different magnitudes. The target pulses (approximately 2000Vpk) are used to sustain ionization and the booster pulses (approximately 6000Vpk) cause ionization of the argon gas. The effect of the booster pulses on the argon gas can at times be seen as what is called a “corona”, dim pulsing blue colored effect at the tip of the nozzle. It is the booster pulses that activates the beam when the nozzle is within 1 cm of the tissue. The tone during the target mode is a lower frequency sound than that of the Active Mode. The Active Mode is when the RF energy is conducted through the ionized gas stream via the same arcing process that occurs in all electrosurgical coagulation. It is through the arcing process, and not through the action of the gas or gas flow, that coagulation occurs. In the Active Mode, the ABC tone will switch to a higher frequency sound and the beam becomes visible from the nozzle to the tissue site. Because the beam is at room temperature, significant heat is not generated until the current passes

1-2

Caution: The Argon Beam Coagulator Section is solely a COAGULATING instrument. It will not cut or vaporize, even when the beam is continuously applied to the most delicate tissue.

Warning: The Argon Beam Coagulator is intended to be used freehand with the proper CONMED ABC® accessory. IT MUST NOT BE USED ENDOSCOPICALLY, UNLESS A CONMED ABC® ACCESSORY SPECIFICALLY DESIGNED FOR SUCH PURPOSE IS BEING USED. 1.5.2

Monopolar Cut and Coag

This section provides four modes of conventional monopolar operation: pure cut, blended cut, pinpoint coagulation, and spray coagulation. The System 7550™ also has a modality called Pulse CUT. Pulse CUT produces a series of short pulses to cut or blend energy to allow small precise incisions. Hand-controlled or foot-controlled accessories are used to conduct RF current to the target tissue. The dual-pedal Monopolar Footswitch is used to activate foot-controlled accessories. A CONMED return electrode is required to return current back to the generator. 1.5.3

Bipolar

Bipolar provides conventional bipolar coagulation. Hand-controlled or foot-controlled accessories (forceps) are used to conduct RF energy to the target tissue. A return electrode is not required as the RF energy passes from one tine (tip) of a bipolar forceps, through the tissue grasped, to the other tine (tip) of the forceps, and back to the generator. A single-treadle bipolar footswitch is available for use with non-handswitching bipolar forceps. 1.5.4

Automatic Return Monitor (A.R.M.)

The CONMED System 7550™ is equipped with the Automatic Return Monitor (A.R.M.) designed

Generator Assembly

Mobile Storage Pedestal

Figure 1.1 Major System Subassemblies

Program Section

Automatic Return Monitor

Bipolar Coagulator Section

Argon Beam Coagulator Section Monopolar Cut and Coag Section Remote Power Control Section

Figure 1.2 Independent System Sections to prevent return site burns. A.R.M. is operable in two user-selectable modes, depending upon the type of return electrode in use and the desired level of patient protection. Dual Foil A.R.M. Mode: Dual-foil mode confers the highest available degree of patient protection. When used as directed, with a suitable dual-foil return electrode, A.R.M. continuously monitors the safety of the patient/electrode contact. If the contact is reduced during surgery, A.R.M. will sound an alarm and disable monopolar output before the contact loss becomes unsafe. Single Foil A.R.M. Mode: Although Dual Foil Mode provides superior abatement of return site burn risk, the Single Foil Mode may be selected for use with conventional, non-monitoring return electrodes. In this mode, a monopolar output will

be disabled and a return alarm will sound only upon loss of electrical continuity between the generator and the electrode. This mode only ensures that the return electrode cord is connected to the generator and the return electrode. WARNING: Single Foil Mode CAN NOT protect against burns due to loss of the return electrode contact with the patient. 1.5.5

Program Mode

Programming functions allow for fast and easy setup of operating settings. Up to nine complete mode and power settings can be stored and recalled at any time. There are three additional selections: "L" to recall the last settings, “0” to set all power settings to zero, and "P" which enables the Pulse Cut and Blend mode.

1-3

When the Pulsed Mode is selected, the system will default all power settings to zero watts. 1. Select Blend Mode if blend effect is desired. 2. Adjust Cut or Blend power. 3. Do not increase the power for any other mode above zero watts, except for ABC power if ABC Mode is to be used. Warning: Pulsed Mode is only effective in the Cut or Blend modes. Coag and Bipolar do not have pulse capability. NOTE: Pulsed output power is approximately 15% of the displayed power. To achieve clinical effects, it is necessary to increase the power setting on the Cut display. 1.5.6

Remote Power Control Mode

When Remote Power Control Mode is selected on the control panel, the surgeon can change the power delivered in CUT, COAG or ABC modes by “double-clicking” the corresponding button on the handpiece and pressing CUT to increase the power or COAG to decrease the power. 1.5.7

Simultaneous Activation

This machine is equipped to provide Simultaneous Activation. Simultaneous Activation is a means of splitting the output power between two separate active electrodes, allowing both hand controls or one handcontrol with the foot control to be activated simultaneously in the Pinpoint or Spray mode. Note: The CONMED System 7550TM will not allow simultaneous activation of Pinpoint or Spray with any other mode. Warning: It is recommended that each active accessory be placed in a sterile Accessory Holster when not in use. Failure to do so may result in unintentional burns to the patient or OR personnel. To achieve simultaneous activation, connect two hand-controlled accessories or one handcontrolled

with one foot-controlled accessory and activate coag in both accessories. The mode of conventional coag can be set to spray or pinpoint. The power output is then distributed to the two active hand-controlled accessories in amounts according to the tissue impedance at each active electrode, with the total output equalling the power display. The active electrode with the lower tissue impedance will receive the majority of the shared power, i.e., if the power output is set to 50 watts, the power mix may be 30W/20W, 40W/10W, etc., depending on the tissue impedances seen, but the sum will always be 50W. Warning: When the generator is operated in the simultaneous mode, the RF leakage may increase by approximately 20%, which increases the potential for an alternate path burn to the patient. 1.5.8

Default Settings

This system is manufactured with automatic default settings when the unit is turned on. Some of the default settings can be changed for customer convenience, however the settings can only be made by a qualified service technician, and can only be changed by making switch selections inside of the unit. On each power up, the system defaults to “safe mode”. Safe Mode is Pure Cut, Pinpoint, Endo ABC and Dual Foil Pad. Some of the default settings can be changed by a qualified biomedical engineer via the switch settings of the default switch (S1) located on the Front Panel board inside the system. Switch positions 1 & 6 are for test and calibration only and must be turned ON after the main power has been turned on or an alarm condition will occur. Instructions on changing the default settings can be found in the CONMED System 7550TM Service Manual (Cat. No. 60-7552-ENG).

Default Switch Settings: (OFF is factory default settings) POS #

FUNCTION

DESCRIPTION

1

Test Mode

OFF for normal operation - ON for system test and calibration.

2

Pad Select

OFF for Dual Pad - ON for Single Pad.

3

Power Default

OFF: All power default to Last Setting - ON all powers default to zero.

4

Coag Mode

OFF for Pinpoint Coag - ON for Spray mode.

5

Dual Activation

OFF for Dual Activation in Coag - ON to inhibit Dual Activation in Coag.

6

Argon Alarm

OFF to enable Argon Alarms - ON to inhibit Argon Alarm (test mode only).

1-4

System Components Section 2.0

2.1 Component Identifications and Description The following identifies the controls, indicators, receptacles, and other operational components of the CONMED System 7550™. WARNING: To prevent injuries and/or damage to the System, do not attempt repair. Maintenance should be performed only by qualified service personnel.

2.2

Generator Assembly

2.2.1

Front

(See Figure 2.1.) 1. Control Panel: Contains the controls and display indicators necessary to operate the Monopolar Cut and Coag modes, the Bipolar mode, the Automatic Return Monitor, and the ABC sections of the System. 2. Output Receptacle Bar: Contains the Output Receptacles for accessories, and houses the Main Power On/Off Switch. 3. Monopolar Handcontrol Receptacle: Provides connection for hand-controlled accessories for Monopolar Cut and Coag. 4. Monopolar Footswitching Receptacle: Provides connection for foot-controlled accessories for Monopolar Cut and Coag. 5. Beam/Monopolar Handcontrol Receptacle: Provides connection for hand-controlled accessories for Monopolar Cut and Coag, and the Argon Beam Handcontrol. 6. Bipolar Receptacle: Provides connection for hand-controlled or foot-controlled accessories (forceps) for the Bipolar Section. 7. Return Electrode Receptacle: Provides connection for both sensing (dual foil) and nonsensing (single foil) return electrodes. 8. Argon Beam Coagulator Receptacle: Provides connection for the ABC® accessory.

WARNING: All active electrosurgical accessories for all sections operate with non-simultaneous, discrete output, i.e., “first come, first served”, except when the unit is operating in Simultaneous Activation mode. WARNING: A CONMED return electrode must be used in monopolar to return current to the generator. 2.2.2

Rear

(See Figure 2.2.) 1. Air Vents: Allow for heat dispersion from internal Generator Assembly components. WARNING: To prevent possible overheating and damage to the generator, do not obstruct the air vents. 2. Sound Level Control: Allows for control of the volume of cut and coagulation audible tone levels. Adjust by turning counterclockwise to decrease volume or clockwise to increase volume. For safety purposes, the tones cannot be completely turned off. This control has no effect on the warning tones which cannot be adjusted. NOTE: Cut, coagulation (includes monopolar, bipolar, and ABC active) and ABC target modes have separate, distinct, audible tones when the accessories are activated. When the Pulse Cut mode is activated, two audible tones will be heard. The shorter, higher frequency tone occurs when RF energy is being delivered. The longer, low frequency tone occurs when the RF is off during the Pulse Cut activation. 3. Chassis Ground: Allows for the connection of service equipment to the third wire safety ground by qualified service personnel. The connection cannot be removed. 4. Registration Plate: Provides the following information: (Generator Assembly) Reorder No. CONMED System 7550™, Serial Number (S/N), Input Requirements, manufacturer’s name and location.

2-1

2.3

Mobile Storage Pedestal

2.3.1

Front

(See Figure 2.3.) 1. Footswitch Storage Shelf: Houses the footswitches and cables used with the CONMED System 7550™ and contains the three receptacles for connection of three footswitches. NOTE: Footswitches are not provided with the CONMED System 7550™; they are available separately. After connection, confirm proper mode activation. 2. Bipolar Footswitch: A single-pedal footswitch is connected to the 3-pin receptacle. When the pedal is depressed, Bipolar circuitry is activated, allowing RF energy to be delivered to the tissue via the bipolar foot-controlled accessory. NOTE: Handswitching bipolar accessories will also be activated if the bipolar footswitch is depressed. 3. Monopolar Footswitch: A dual-pedal (“CUT/ COAG”) Footswitch is connected to the 4pin Receptacle. When the “CUT” pedal is depressed, Monopolar cut circuitry is activated, allowing RF Cut or Pulse Cut energy to be delivered to the tissue site via a monopolar foot-controlled accessory. When the “COAG” pedal is depressed, monopolar coagulation circuitry is activated. 4. Argon Beam Coagulator Footswitch: A single-pedal (“BEAM”) footswitch is connected to the 5-pin receptacle. When the pedal is depressed, the target mode of the ABC® is activated if the distance from the nozzle tip to the tissue surface is greater than one centimeter (.4"). When the tip of the nozzle is within approximately one centimeter (.4") of the tissue surface, the active mode of the Argon Beam Coagulator is initiated, allowing RF energy to be conducted through the argon gas stream to the tissue site. NOTE: When the Argon Beam Coagulator is activated, if there is an internal malfunction affecting gas flow, or if there is a restriction of gas flow in the ABC® Accessory or Cable, a red “Gas Fault” indicator within the ABC section will be illuminated and an audible tone will be generated. ABC output energy cannot be initiated. Check the ABC® Accessory and Cable, and eliminate any

2-2

obvious restrictions. If this action does not alleviate the problem, disconnect the ABC® Accessory Cable at the Receptacle Bar and reactivate the ABC to verify an internal malfunction. The System cannot be used if an internal malfunction exists. If an internal malfunction does not seem to exist, connect a new ABC® Accessory. WARNING: Ensure that the footswitches are not accidentally depressed in order to prevent accessories from being unintentionally activated. 2.3.2

Rear

(See Figure 2.4.) 1. Main Power Cord: A 3 meter (10 ft.) cable providing electrical connection from the CONMED System 7550™ to a standard three-prong, hospital-grade receptacle. WARNING: Grounding reliability can only be achieved when the CONMED System 7550™ is connected to a three-prong, hospital-grade receptacle. 2.3.3

Argon Gas Delivery System

(See Figure 2.4.) 2. Cylinder Pressure Gauge: The scale indicates the pressure in the Argon cylinder in pounds per square inch (psi) and kiloPascals (kPa). NOTE: If gas pressure falls below approximately 1700 kPa (250 psi) the following will occur: A yellow indicator within the ABC section will illuminate and an audible tone will be generated for approximately four seconds. When the tone stops, the Low Gas Supply indicator will remain illuminated as long as the Argon gas pressure is less than 250 psi. Check all cylinder connections, and change cylinders as necessary. If the cylinder is empty, the yellow “Low Gas” warning indicator and the “Gas Fault” alarm indicator within the ABC section will both illuminate and an audible tone will be generated. Check all cylinder connections and ensure that the cylinder valve is open. Change cylinders as necessary. The ABC section will remain off until gas is re-established in the lines. 3. Argon Gas Cylinders: Two cylinders of Argon Gas may be secured in place with the restraining straps. WARNING: High purity grade (99.998% minimum purity) argon gas must be used with the CONMED System 7550™.

1

Main Power On/Off Switch 2

3

4

5

6

8

7

Figure 2.1 Generator Assembly Front 1

2

3 4

Figure 2.2 Generator Assembly Rear 2

1

Handle

1

2 4 5

3

3

4

6

Figure 2.3 Pedestal Front Figure 2.4 Pedestal Rear

2-3

NOTE: Argon Gas Valve Handnut Connection is type CGA-580. For use with argon gas tanks that require a different type of connector, an adapter is required between the Handnut Connector and Argon Tank. The adapter must be rated for 3000 psi / 200 bar.

A wide variety of ABC, conventional, and combined ABC and conventional electrosurgical accessories are available from CONMED to meet your particular needs. Consult your CONMED Corporation sales representative about accessories for your application.

NOTE: CONMED provides argon gas tanks for type CGA-580 connections only. For countries that use standard connections other than CGA580, an adapter will be required to fill the argon tanks that are provided by CONMED.

CAUTION: Do not use the nozzle of an ABC accessory to probe the tissues, as this may result in damage to the electrode.

WARNING: Replacing the Handnut Connection must be performed by a qualified service technician. NOTE: Argon Gas Cylinders with the following dimensions must be used: outside diameter = 17.8 cm (7") maximum; height with valve = 61 cm (24") maximum; capacity = 1,190 liters (42 cubic feet). NOTE: At a constant gas flow rate of 2 liters/ minute (SLPM), there is approximately 480 minutes (8 hours) of continuous use per cylinder. At a constant maximum gas flow rate of 10 SLPM, there is approximately 97 minutes (1 hour and 37 minutes) of continuous use per cylinder. 4. Gas Cylinder Valve: When open, allows for transfer of argon gas from the cylinder to the Pressure Line. 5. Pressure Line: When the cylinder valve is open, the Line allows for transfer of argon gas from the connected cylinder to the ABC Section of the System. WARNING: Always verify that argon gas is contained in the cylinder you are connecting. The line connections are compatible with argon gas cylinders as well as with several other types of gas cylinders (e.g., freon, helium, krypton, neon, nitrogen, xenon). 2.3.4

Bottom

(See Figure 2.4.) 6. Casters (4): Allow the System to be moved in all directions. All four Casters rotate 360º and the two rear Casters can be locked to immobilize the System. 2.3.5

Accessories

WARNING: To prevent possible operator injury, connect the active accessories at the Output Receptacle Bar before enabling any of the sections.

2-4

Operation Section 3.0

3.1

General Precautions

This equipment, in conjunction with connected accessories, is intended to produce high-frequency electrical energy for the controlled destruction of tissue. Safe and effective electrosurgery is dependent not only on equipment design, but also on factors under the control of the operator. It is important that the instructions supplied with this equipment be read, understood, and followed in order to ensure the safe and effective use of this equipment. CAUTIONS For Equipment Preparation The power cord of the unit should be connected to a properly polarized and grounded power source whose voltage and frequency characteristics are compatible with those listed on the nameplate of this unit. Reusable accessory cables should be periodically function and safety tested in accordance with the original manufacturer’s instructions. When the main power switch is first turned on, the system will perform internal self diagnostics. Self diagnostics is a series of tests that the system performs to verify circuits and software are working properly. If a failure is detected during the self diagnostics, an error code will be displayed in the monopolar section. Refer to the error codes in Section 5 to determine if the problem can be handled in the Operating Room, or if the system needs to be serviced. During the self-diagnostic testing, the following tests will be conducted that require verification by the person that is initializing the system. Location of the items to be checked are identified in Figure 3.2. • Display Test a) Verify the “ones” and “tens” digits have “88” displayed. b) Verify the hundreds digit has “3” displayed. • Indicator Test a) Verify that all indicators on the front panel illuminate.

• Tone Test a) Verify during the initialization test that an audible tone occurs. Visually inspect all accessories before each use to verify the integrity of insulation and the absence of obvious defects. The CONMED System 7550™ is equipped to connect three monopolar accessories at one time for the convenience of the surgical staff. Despite the fact that the CONMED System 7550™ will deliver power to only the commanded electrodes, unused accessories that are connected should be stored in a safe, electrically insulated place such as a nonconductive holster. CONMED recommends that accessories not be connected unless it is known that they will be needed. The unused active electrode should never be placed on the patient. This unit is equipped with a hospital grade, 3prong, power connector that meets all of the requirements for safe grounding of the unit. The user should verify that the power receptacle to be used with this unit is properly grounded and is correctly polarized. Do not use ground cheater plugs or extension cords. Do not place liquid containers on top of the unit. Wipe spilled liquids off the unit immediately to preclude inadvertent entry of liquids. Do not operate this unit except in its normal position. Verify that the return electrode cable is connected to the return electrode connection. Potentially hazardous conditions may exist when accessories of similar connector types are combined. Be certain that accessories are appropriate for the type of generator output used. Confirm bipolar leads are connected to the bipolar jacks. Connecting bipolar accessories to monopolar outputs may result in patient injury. Do not reuse disposable (single use) accessories. Do not use cords as handles. Damage to the insulation and increased risk of burns or other injury may result.

3-1

If used simultaneously with a conventional isolated electrosurgical generator, the RF signals of the CONMED System 7550™ and the second generator may interfere with one another. The System should not be used simultaneously with a conventional ground referenced electrosurgical generator as alternate path burns may result.

The use and proper placement of a return electrode is a key element in safe and effective electrosurgery. Follow manufacturer’s directions and recommended practices for the preparation, placement, use, surveillance, and removal of any return electrode supplied for use with this electrosurgical unit.

Use only accessories that comply with the relevant regulatory standards for your location and meet the specifications listed in Section 5.0.

Apply the return electrode over a well vascularized muscle mass that is thoroughly clean and dry. Clean and shave site as necessary per hospital policy to provide adequate electrical connection. Avoid placement over scar tissue, bony prominences or other areas where pressure points might develop.

Only non-flammable agents should be used for cleaning and disinfection wherever possible. CAUTIONS For Patient Preparation Electrosurgery should NEVER be performed in the presence of flammable anesthetics, flammable prep solutions or drapes, oxidizing gases such as Nitrous Oxide (N2O), or in oxygen-enriched environments. The risk of igniting flammable gases or other materials is inherent in electrosurgery and cannot be eliminated by device design. Precautions must be taken to restrict flammable materials and substances from the electrosurgical site, whether they are present in the form of an anesthetic, life support, skin preparation agent, are produced by natural processes within body cavities, originate in surgical drapes, tracheal tubes, or other materials. There is a risk of pooling of flammable solutions in body depressions such as the umbilicus and in body cavities, such as the vagina. Any excess fluid pooled in these areas should be removed before the equipment is used. Any flammable agents used for cleaning or disinfection, or as solvents of adhesives, should be allowed to evaporate before the application of electrosurgery. Due to the danger of ignition of endogenous gases, the bowel should be purged and filled with nonflammable gas prior to abdominal surgery. To avoid the risk of tracheal fires, never use electrosurgery to enter the trachea during tracheotomy procedures. This unit is equipped with the Automatic Return Monitor (A.R.M.). A.R.M. verifies that the return electrode cable is unbroken and connected to the return electrode and to the electrosurgical unit when in Single Foil mode. It DOES NOT verify that a single foil return electrode is in contact with the patient. When in Dual Foil mode, the A.R.M. confirms that the total resistance is in the preset safety range. Proper application and visual inspection of the return electrode are required for safe operation.

3-2

Because of the risk of burns, needles should never be used as return electrodes for electrosurgery. The return electrode should be placed so that its entire conductive area is in contact with an area of the patient’s body that has a good blood supply and should be as close to the operative site as is possible. In general, electrosurgical current paths should be as short as possible and should run either longitudinally or in a diagonal direction to the body, not laterally and under no circumstances lateral to the thorax. Electrodes and probes of monitoring, stimulating, and imaging devices can provide paths for high frequency currents even if they are battery powered, insulated, or isolated at 60 Hz. The risk of burns can be reduced but not eliminated by placing the electrodes of probes as far away as possible from the electrosurgical site and the return electrode. Protective impedances incorporated in the monitoring leads may further reduce the risk of these burns. Needles should not be used as monitoring electrodes during electrosurgical procedures. The active electrode should not be used in the vicinity of electrocardiograph electrodes. Heat applied by thermal blankets or other sources is cumulative with the heat produced at the return electrode (caused by electrosurgical currents). Risk of a patient injury may be minimized by choosing a return electrode site that is remote from other heat sources. When using injection cannulas as electrocardiograph electrodes, the metal cone must not be placed on the skin. This also applies to the leads to monitoring instruments.

Electrosurgery by its nature produces significant levels of electromagnetic interference (EMI) when the ESU is activated. This EMI may damage or impair the function of other electronic equipment in the O.R., especially that which makes contact with the patient. Adverse effects can be mitigated by use only of equipment specifically designed to tolerate electrosurgical interference. Cables subject to flexing should be inspected frequently for shielding integrity. The patient should not be allowed to come into contact with metal objects that are grounded. It is recognized that this recommendation may not be practical during certain procedures (e.g., those in which uninsulated head frames are used). However, to maximize patient safety during the use of electrosurgical devices, such practices should be minimized. Skin to skin contacts, such as between the arm and the body of a patient, should be avoided, by the insertion of dry gauze. The use of electrosurgery on patients with cardiac pacemakers or pacemaker electrodes is potentially hazardous. The pacemaker may be irreparably damaged and/or the high frequency energy of the electrosurgical output may interfere with the action of the pacemaker. Ventricular fibrillation may occur. Precautions should be taken to ensure that the patient’s well-being is maintained in the event of such interference. CONMED recommends that the Cardiology Department and the manufacturer of the pacemaker be consulted for advice before operating on a patient with a pacemaker. These precautions also apply to operating room personnel with cardiac pacemakers. To minimize the possibility of cardiac pacemaker interference, place the return electrode such that the electrosurgical current path is as far as possible from the pacer lead. CAUTIONS For Use PLEASE NOTE: Effective November 29, 1991, federal law (U.S.A.) requires that all healthcare facilities must report to the manufacturer of a medical device, any death or serious injury or illness to a patient related to the use of a medical device. Serious injuries or illness involving the use of a medical device must be reported to the manufacturer of the device (or to the FDA if the manufacturer of the device is not known) within 10 working days of the incident. Summary reports of such injuries must also be submitted directly

to the FDA twice a year. Patient deaths related to the use of a medical device must be reported to the manufacturer and the FDA. For further information, please contact the Regulatory Affairs Department of CONMED Corporation at 800552-0138 / 303-699-7600 / Fax 303-699-9854. Electromagnetic Interference: This equipment has been tested and found to comply with the limits for medical devices in IEC 60601-1-2: 1993. These limits are designed to provide reasonable protection against harmful interference in a typical medical installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference ot other devices in the vicinity. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to other devices, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving device; increase the separation between the equipment; connect the equipment into an outlet on a circuit different from that to which the other device(s) are connected. Consult CONMED Technical Services for assistance. The CONMED System 7550™ Electrosurgical Generator is capable of causing physiological effects, including burns to the patient or operator. This equipment should be operated only by trained, authorized medical personnel. WARNING: Failure of the CONMED System 7550™ could result in an unintended increase in output power. When the System 7550™ is in the Pulse Cut mode (a “P” is shown in the Program Display), activating Cut will deliver pulsed cutting RF energy. This pulsed mode provides a short burst at the displayed power. The actual power delivered over the Pulse Cut cycle is approximately 15% of the displayed power. The Pinpoint and Spray coagulation modes, the Bipolar mode and the ABC mode do not have a Pulsed Mode when the unit is in the Pulse CUT mode. CAUTION: When in Pulsed Cut, all other modes will deliver output power as displayed. It is suggested all other powers be set to zero unless use is intended. The Argon Beam Coagulator is solely a coagulating instrument. Its only effects are fulguration

3-3

and thermal coagulation. It will not cut or vaporize, even when the argon beam is continuously applied to the most delicate tissue. The Argon Beam Coagulator is intended to be used freehand with the proper CONMED ABC® accessory. It must not be used endoscopically or laparoscopically, unless a CONMED ABC® accessory specifically designed for such purpose is being used. Use only CONMED approved accessories for endoscopic and laparoscopic procedures. Flow rates of 0.5 to 4 SLPM are recommended for these procedures and the Endo mode should be selected. Be sure to use the lowest gas flow possible for the desired coagulation effect. WARNING: Introduction of argon gas to an insufflated cavity can increase insufflation pressures if not closely monitored. Increased pressures have been associated with gas emboli. Active venting is necessary to prevent overinsufflation. Continually monitor the intraabdominal pressure. It is recommended that electronic insufflators with non-defeatable audible and visual over-pressurization warning signals be used during all laparoscopic procedures. Intra-abdominal pressure should not exceed 18 mmHg. Remove the laparoscopic handpiece from the abdominal cavity when not in use. For more information, refer to the Directions for Use included with the laparoscopic ABC® handpiece. Patient monitoring that is considered effective for the early detection of venous or pulmonary gas embolisms, such as, end-tidal CO2, Doppler flowmeters, mean arterial blood pressure, and pulse oximetry, should be used when long periods of argon beam coagulation are expected during a procedure. If any clinical signs of gas embolism are observed, terminate the use of argon beam coagulation immediately. Do not use monopolar electrosurgery on small appendages, as in circumcision or finger surgery, as it can cause thrombosis and other unintended injury to tissue proximal to the surgical site. Please note ANSI/AAMI Standard HF-18-1993 currently contraindicates both monopolar and bipolar electrosurgery for circumcisions. Urologic literature also contraindicates the use of monopolar electrosurgery for circumcision, and instead recommends the use of bipolar electrosurgery where clinically indicated for

3-4

hemostasis. Physicians choosing to use bipolar electrosurgery for circumcisions should be trained in this technique and knowledgeable of the effects of electrosurgery on tissue of this nature. Should you decide that the bipolar electrosurgical technique is acceptable for circumcision, do not apply the bipolar electrosurgical current directly to circumcision clamps. Apparent low power output or failure of the electrosurgical equipment to provide the expected effect at otherwise normal settings may indicate faulty application of the return electrode, failure of an electrical lead, or excessive accumulation of tissue on the active electrode. Do not increase power output before checking for obvious defects or misapplication. Check for effective contact of the return electrode to the patient any time that the patient is moved after initial application of the return electrode. Studies have shown that smoke generated during electrosurgical procedures may be harmful to surgical personnel. These studies recommend using a surgical mask and adequate ventilation of the smoke using a surgical smoke evacuation system or other means. If a Dual Foil Return Alarm is sounded intraoperatively, physically confirm proper return electrode attachment to the patient prior to pressing the Monitor Set key. Smooth hand over return electrode foam backing to ensure electrode contact to patient skin. Electrosurgical leads (active, bipolar or return) should not be allowed to contact the patient, staff, or other electrical leads connected to the patient. The output power selected should be as low as possible and activation times should be as short as possible to achieve the intended surgical effect. When uncertain of the proper power level in a given procedure, start with a low setting and increase as required and/or consult the manufacturer. Requests for higher power settings, or longer activations than normal may indicate that a fault exists. Do not increase power settings until connection and/or placement of the return electrode, all electrical cables, electrodes, and connectors are verified. Observe all caution and warning notices printed on the cover of the unit. The operating room staff should never contact electrosurgical electrodes (either active or return

electrode) while the RF output of the unit is energized. The tips of recently activated accessories may be hot enough to burn the patient or ignite surgical drapes or other flammable material. Temporarily unused active electrodes should be stored in an electrically insulated container. The unused active electrode should never be placed on the patient. The surgical effects obtained are dependent on a number of factors including waveform, electrode size, electrode geometry, power level and surgical technique. The size and geometry of monopolar electrodes are significant in that a large electrode, absent of sharp features (e.g.; a ball electrode) will have no tendency to cut, regardless of the output power level. Conversely, a small, sharp electrode, such as a needle or wire loop, will be likely to cut simply from mechanical pressure at conservative power settings. Note that other generator models will have different clinical effects than the System 7550™, even when the power settings are the same. The operator is to visually ensure the proper system settings throughout the procedure. Position the system so that the front panel setting can be monitored at all times by the operator.

currents, which can be hazardous to the patient. It is recommended that a second electrosurgical generator be used when it is necessary to perform simultaneous operation. This ESU is equipped with the Automatic Return Monitor (A.R.M.), which monitors the quality of the patient to pad interface. When a correctly functioning single foil dispersive electrode is connected to the ESU, A.R.M. verifies the connection between the ESU, the dispersive electrode cable and the dispersive electrode. It DOES NOT verify that a single foil dispersive electrode is in good contact with the patient. When using a dual foil dispersive electrode, A.R.M. confirms the total resistance is within the preset safety range. Proper application and visual inspection of the dispersive electrode is required for safe operation. Ensure that the footswitches are not inadvertently depressed in order to prevent accessories from being unintentionally activated. Place footswitches in locations that necessitate deliberate action in order to activate the footswitch. Use caution when selecting the correct footswitch to activate. The System 7550™ and cart are made of conductive material that can cause static discharge. It should not be used in a flammable environment.

Loose electrodes may affect energy delivery or come loose from the active accessory. To prevent a loose electrode from falling onto the drapes or inside a patient, place unused accessories in an electrically insulated container.

When connecting the ABC accessory to the System 7550™, ensure that the connection is tight.

Jewelry and other metallic items can cause alternate site burns if they make contact with grounded items and should be removed from the patient prior to use of Electrosurgery.

To reduce risk of embolism, minimize the exposure of unsealed tissue to blowing Argon gas without a beam. Since an Argon beam will rapidly seal the tissue where it is applied, thus blocking entry of argon gas, it is important that the beam be quickly initiated.

Simultaneous activation can be used in monopolar coagulation modes only. Caution should be used as the output from either active electrode may change as a result of activation of a second output or ending activation of a second output. Power sharing is unlikely to be equal because of differences in electrode to tissue distance and other factors. This unequal power sharing can be enough to stop power delivery to one electrode if the second electrode is close to tissue and the first electrode is somewhat above the tissue. The motion or deactivation of one electrode can cause the other electrode to start delivering power when it previously had been too far away from tissue to arc prior to the first electrode deactivation. Simultaneous activation can also increase leakage

Do not apply ABC on vessels greater than 3mm in diameter.

CAUTIONS For Testing or Servicing This electrosurgical unit should be tested by qualified service personnel on a periodic basis to ensure proper and safe operation. It is recommended that examination of the unit be performed at least yearly. Refer all servicing to qualified service personnel. Your CONMED representative will be happy to assist you in getting your equipment serviced. High voltages are developed within the unit that are accessible when the top cover is opened. These voltages are potentially dangerous and should be treated with extreme caution.

3-5

The high voltage DC power supply in the CONMED System 7550™ is equipped with a bleeder resistor to dissipate the charge on the filter capacitor. However, it takes several seconds after power is removed to bleed that charge down to a safe level. It is recommended that at least thirty (30) seconds be allowed to elapse before touching or attempting to perform any service involving the power supply or power amplifier.

Other important notes, cautions and warnings are included throughout this manual. They are included in the specific step-by-step operating procedures.

Never remove or install any parts with power on. Avoid contact with the output leads when the unit is activated.

(3) Store the footswitches and cables in the Footswitch Compartment Shelf.

Although this unit will withstand momentary short circuits on the output, prolonged short circuits may damage the unit. Short circuiting the output should be avoided since it is neither necessary nor desirable. Since the clinical use of electrosurgical units is intermittent in nature with duty cycles on the order of 10%, this unit is not designed to operate for extended periods of continuous output. When testing, it is recommended that duty cycles be limited to 50% with maximum activation times of 30 seconds. Life of the equipment will be extended by minimizing operating temperature and extreme thermal cycles. To avoid damage to the equipment, use care when moving or positioning the System.

3.2

Moving and Positioning the System

(1) Turn all operating controls off. (2) Disconnect the power cord from the wall receptacle.

(4) Release the locks on the rear casters. (5) Using the handle on the top rear of the CONMED System 7550™, move the unit.

3.3

Operating Procedures

3.3.1

Verify Argon Gas for the ABC

(1) Ensure that two Argon Gas Cylinders are secured to the back of the system; see Figure 3.1. (Refer to Installation and Removal of Argon Gas in Section 4.2.2 Operator Service). (2) Only one gas cylinder can be connected to the pressure line at a time. The cylinder that is connected is the one to be used. To change the pressure line to the other cylinder, refer to Installation and Removal of Argon Gas in Section 4.2.2.

Main Power Cord

Pressure Gauge

Cylinder Valve

Pressure Line

Gas Cylinder

Figure 3.1 System Rear

3-6

(3) Open the selected cylinder by slowly turning the valve on the top of the cylinder counterclockwise. THE VALVE SHOULD BE OPENED COMPLETELY. (4) Ensure adequate cylinder pressure as indicated on the pressure gauge. The scale on the pressure gauge should read approximately 14,500 kPa (2100 psi) for a full cylinder. THE GAUGE MUST READ ABOVE 1700 kPa (250 PSI) OR ALARMS WILL BE ACTIVATED INDICATING PRESSURE IS LOW. (5) Switch to the other cylinder if the pressure is under 2000 kPa (300 psi). (Refer to Installation and Removal of Argon Gas Cylinders in Section 4.2.2). WARNING: Medical grade (99.998% minimum purity) argon gas must be used. (6) Position the System for the procedure. (7) Lock the rear casters. (8) Plug the power cord into a hospital-grade receptacle. WARNING: Grounding reliability can only be achieved when the CONMED System 7550TM is connected to a three-prong, hospital-grade receptacle. 3.3.2

Connect the Desired Footswitches

(1) Connect the desired footswitch cables to the appropriate receptacles as follows. After connection, confirm proper mode activation. • Monopolar Footswitch cable to the “4” pin receptacle. • ABC Footswitch Cable to the “5” pin receptacle. • Bipolar Footswitch Cable to the “3” pin receptacle. (2) Position the footswitch(es) for ease of operation by the surgeon. 3.3.3 Connect the Return Electrode Cable and Return Electrode The Automatic Return Monitor (A.R.M.) virtually eliminates patient burns at the site of the return electrode. The ASSIST Resistance Bargraph displays the resistance of the patient measured between the conductive contacts of the return electrode. This information can be used by the operating room staff to note patients with

high skin resistance and to determine the quality of the selected return electrode site. It will also detect a return electrode that is open or shorted. Microprocessor-controlled circuitry prevents the unit from monopolar activation when patient resistance is outside the expected range and when a return cable is defective. (1) Select and prepare the patient return electrode site and apply the return electrode in full contact with the patient, and in accordance with the manufacturer’s instructions. If no instructions are given, observe the guidelines provided in Section 3.1 of this manual. (2) Connect the return electrode cable to the return electrode receptacle on the System 7550™. (3) Inspect and connect the desired monopolar or bipolar accessories to the connectors on the front of the System 7550™. Turn “on” the main power switch located on the front of the system at the left of the output receptacle bar. The generator will go through a short self check in which all indicators will illuminate. NOTE: This electrosurgical unit incorporates the Automatic Return Monitor. The monitor will inhibit monopolar operation of the unit if the requirements for the return electrode have not been satisfied. (4) On power up, the CONMED System 7550™ defaults to the Dual Foil Mode. (Dual Foil Pad is a factory setting; Single Foil Pad default on power up can be selected. See Section 1.5.8, Default Settings.) If a single foil pad is used, select this mode by pressing the PAD SELECT switch. Confirm that the ASSIST Resistance Bargraph and the Return Fault Indicator are blank if SINGLE FOIL mode is selected. If DUAL FOIL mode is selected, press the Monitor Set switch ONLY after visually confirming adequate electrode contact with patient. Confirm the Return Fault indicator is blank, and the ASSIST Resistance bargraph stops flashing and displays 2 to 8 green bars. The number of green bars indicates the patient’s resistance and can be used as an indicator of patient risk and the quality of the return electrode site. WARNING: Do not depend solely on the ASSIST resistance bargraph for confirmation of good return electrode application. Due to interaction between the return electrode site

3-7

conditions and the contact area, visual confirmation of contact is mandatory. 3.3.4

In Case of Difficulty

Trouble with the return electrode is signalled by illumination of the Return Fault Indicator and an audible alarm. Activation attempts will result in an audible fault alarm. Replace the return electrode if any patient contact has been lost. 3.3.5

Single Foil Alarm

If a Single Foil alarm condition exists, confirm that a single foil return electrode is attached to the unit. Check all return electrode cable connections and replace the return electrode or cable if necessary. 3.3.6

Dual Foil Alarm

If a Dual Foil alarm exists, check the ASSIST Resistance bargraph for clues to the problem. a) All of the bars are flashing, the resistance is too high. This can be cause by inappropriate return electrode site, a broken cable, or poor connections to the unit. b) More bars are flashing than originally were when Monitor Set was pressed. Check to see if the return electrode has peeled away from the patient or if the unit has a poor connection. c) No bars are on. Check to see if a single foil electrode has been connected instead of a dual foil electrode. Confirm that the dual foil electrode is not connected to something highly conductive or folded over on itself. Press the Monitor Set switch to store the new resistance for Dual Foil Mode. 3.3.7 Setting Up the Argon Beam Coagulator (ABC®) CAUTION: The ABC section is solely a COAGULATING instrument. Its only effects are fulguration and thermal coagulation. It will not cut or vaporize, even when the beam is continuously applied to the most delicate tissue. NOTE: When connecting a new ABC® handpiece to the CONMED System 7550™, the air in the gas line must be purged with argon gas. To do this, hold the ABC® handpiece up and away from all objects and press the Purge switch located within the ABC section. The system will enable the argon flow and purge the system for approxi-

3-8

mately four seconds. (1) When the generator is first turned on the ABC section is automatically turned on, the system will perform a display test and enable all the indicators within the ABC section to allow the user to verify that all displays and indicators are working. ABC has three user modes: Endo, Manual and Automatic. The modes refer to argon flow settings and limits except in Endo, where this mode allows lower power settings than Manual and Automatic. To select a mode, press the appropriate switch in the ABC Section. ENDO Mode The System 7550™ defaults to the Endo mode when the unit is turned on. The green indicator near the Endo switch will be illuminated. The Endo mode is a manual flow mode, which means the user must manually set the flow rates. The minimum flow and power levels in Endo are 0.1 SLPM and 1 Watt respectively. These levels are lower than those possible in the Manual and Automatic modes. The Endo mode is recommended for all endoscopic and laparoscopic procedures. This mode limits the argon gas flow to a maximum of 4 SLPM to reduce the chance of embolism. The Endo mode will allow the use of small diameter, flexible argon beam probes for gastrointestinal procedures. The System 7550™ will detect Flex ABC probes and limit the argon gas flow to 2 SLPM. In some cases, some GI probes may activate the Flow Fault alarm in Endo mode. If this happens, reduce the gas flow to 1.0 or 1.5 SLPM. Be sure to follow the manufacturer’s instructions for use packaged with the GI ABC probe. When the System 7550™ is turned on, the gas flow will be set according to the last power setting as follows: ABC Power Setting

Default Gas Flow

Less than 11 Watts

1 SLPM

11-80 Watts

2 SLPM

81-150 Watts

4 SLPM

Select the desired ABC power level by rotating the Power Control Dial. Power can be set from 0 to 150 Watts in 1 watt increments. The selected power is displayed in the Power Display window. (See Figure 3-2.) The flow rate is a manual adjustment mode, however the flow rate has both