Covidien SurgiStat User manual

Service Manual
SurgiStatTM
Low-Power Electrosurgical Generator

Service Manual
SurgiStatTM
Low-Power Electrosurgical Generator
1079008

ii SurgiStat Low-Power Electrosurgical Generator Service Manual
Preface
Preface
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 using the Covidien SurgiStatTM Low-Power Electrosurgical
Generator only. Additional technical information is available in the SurgiStatTMLow-Power
Electrosurgical Generator User’s Guide.
This document covers technical descriptions of the SurgiStat electrosurgical generator,
including its physical appearance, all operator controls and indications, operational
specifications, component functional descriptions (module level), diagrams of the
electronic circuits used, and troubleshooting guidelines (with chart comparisons).
The SurgiStat generator was constructed with the highest quality components and was
built in an ISO 9000 registered environment. In the unlikely event that your generator fails
within one year of purchase date, Covidien will warranty the product and effect factory
repairs. Please refer to the Limited Warranty, for what is covered and how long. For
information on how to obtain a Return Authorization Number, refer to Step 1 – Obtain a
Return Authorization Number on page 8-2.
Equipment covered in this manual
SurgiStat™ Low-Power Electrosurgical Generator (VLSURGGEN)
Safety Precautions When Operating the Generator
The safe and effective use of electrosurgery depends to a large degree on factors solely
under the control of the operator. There is no substitute for a properly trained and vigilant
medical staff. It is important that they read, understand, and follow the operating
instructions supplied with this electrosurgical equipment.
To promote the safe use of the SurgiStat electrosurgical generator, please refer to the
SurgiStat Low-Power Electrosurgical Generator User’s Guide for standard operating
precautions.

SurgiStat Low-Power Electrosurgical Generator Service Manual iii
Conventions Used in this Guide
Conventions Used in this Guide
Warning
Indicates a potentially hazardous situation which, if not avoided, could result in death or serious
injury.
Precaution
Indicates a hazardous situation which, if not avoided, may result in minor or moderate injury.
Notice
Indicates a hazard that may result in product damage.
Important
Indicates an operating tip or maintenance suggestion.

iv SurgiStat Low-Power Electrosurgical Generator Service Manual
Limited Warranty
Limited Warranty
Covidien warrants each covered product listed below to be free from defects in material
and workmanship for normal use and service for the period(s) set forth below. Covidien’s
obligation under this warranty is limited to the repair or replacement, at its sole option, of
any product, or part thereof, which has been returned to it (or its authorized distributor)
within the applicable time period shown below after delivery of the product to the original
purchaser, and which examination discloses, to Covidien’s satisfaction, that the product is
defective. This limited warranty does not apply to any product, or part thereof, which has
been repaired or altered in a way so as, in Covidien’s judgment, to affect its stability or
reliability, or which has been subjected to misuse, neglect, or accident.
The warranty periods for Covidien products are as follows:
Notwithstanding any other provision herein or in any other document or communication,
Covidien’s liability with respect to this limited warranty and the products sold hereunder
shall be limited to the aggregate purchase price for the products sold to the customer. This
limited warranty is non-transferable and runs only to the original purchaser of the covered
product(s). There are no warranties which extend beyond the terms hereof. Covidien
disclaims any liability hereunder or elsewhere in connection with the sale of products and
for any form of indirect, tort, or consequential damages.
This limited warranty and the rights and obligations hereunder shall be construed under
and governed by the laws of the State of Colorado, USA. The sole forum for resolving
disputes arising under or relating in any way to this limited warranty is the District Court
of the County of Boulder, State of Colorado, USA.
Covidien reserves the right to make changes in covered products built or sold by it at any
time without incurring any obligation to make the same or similar changes to equipment
previously built or sold by it.
THE OBLIGATION TO REPAIR OR REPLACE A DEFECTIVE OR NONPERFORMING PRODUCT
IS THE SOLE REMEDY OF THE CUSTOMER UNDER THIS LIMITED WARRANTY. EXCEPT AS
EXPRESSLY PROVIDED HEREIN, COVIDIEN DISCLAIMS ALL OTHER WARRANTIES,
WHETHER EXPRESS OR IMPLIED, ORAL OR WRITTEN, WITH RESPECT TO
PRODUCTS, INCLUDING WITHOUT LIMITATION ALL IMPLIED WARRANTIES,
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
SurgiStat™ Low-Power Electrosurgical Generator One year from date of shipping

SurgiStat Low-Power Electrosurgical Generator Service Manual v
Software License
Software License
Covidien llc, (collectively called “COVIDIEN” herein) owns the entire right, title, and
interest in and to all of the computer programs and all portions thereof, and associated
documentation (collectively, the “Software”) provided to Customer as may be installed in
the Products and equipment addressed herein or provided separately, and it has the sole
right to grant licenses hereunder.
The evaluation allowance herein and any ultimate price paid by Customer for the products
incorporating the Software include as a portion of that evaluation allowance, or price, a
license fee granting Customer only the rights set forth in this Software License. Customer
further acknowledges and agrees that the Software is owned exclusively by COVIDIEN.
The Software is licensed to be used on only one computing device or Product, and a valid
license must be purchased for each computing device on which the Software is installed.
Single User License Grant: COVIDIEN grants to Customer a limited, nonexclusive, non-
sublicensable, nontransferable and revocable license to use the Software, exclusively at
Customer’s location as identified by Customer as the ship-to location of the Product, solely
in machine-readable object code form only on a single central processing unit owned or
leased by Customer or otherwise embedded in equipment provided by COVIDIEN, and for
the sole purpose of Customer’s internal business purpose in the operation of the Product
or equipment purchased from, other otherwise provided by, COVIDIEN or its affiliates.
Except to the extent expressly authorized in this Software License or by law, Customer shall
not and shall not cause any third party to: (i) decompile, disassemble, or reverse engineer
the Software; (ii) modify or create any derivative works (including, without limitation,
translations, transformations, adaptations or other recast or altered versions) based on the
Software, or alter the Software in any way; (iii) merge the Software with any other
software or product not supplied by Supplier; (iv) use, copy, sell, sublicense, lease, rent,
loan, assign, convey or otherwise transfer the Software except as expressly authorized by
the Agreement; (v) distribute, disclose or allow use of the Software, in any format, through
any timesharing service, service bureau, network or by any other means, to or by any third
parties; (vi) remove or modify any copyright, confidential and/or proprietary markings,
legends or restriction which are in the Software originally supplied to Customer; or (vii)
violate any obligations with regard to COVIDIEN’s Confidential Information. To the extent
that Customer is expressly permitted by applicable mandatory law to undertake any of the
activities listed in the preceding sentence, Customer will not exercise those rights until
Customer has given COVIDIEN thirty (30) days written notice of Customer’s intent to
exercise any such rights unless an order of a government agency of competent jurisdiction
will not so allow.
Except for the limited license rights expressly granted in this Software License, COVIDIEN
reserves all rights in and to the Software and any modifications thereto and derivations
thereof, including, but not limited to, all title, ownership, intellectual property rights and
all other rights and interests. Customer will own only the hardware or physical media on
which the Software is stored or processed, if any.
Customer agrees that the Software, including the specific design and structure of
individual programs, constitute confidential information and trade secrets of COVIDIEN,
whether or not the programs may be copyrighted or copyrightable, and/or patented or
patentable. Customer agrees not to disclose, provide, or otherwise make available such
confidential information, trade secrets or copyrighted material in any form to any third

vi SurgiStat Low-Power Electrosurgical Generator Service Manual
Software License
party. Customer agrees that it will make the Software available only to employees,
contractors, or consultants with a need to know, who are obligated to comply with all
license restrictions contained in this Software License Agreement and to maintain the
secrecy of the Software and all other Confidential Information. Customer is responsible for
the compliance of all users with these obligations.
Customer may, from time to time, request that COVIDIEN incorporate certain features,
enhancements or modifications into the Software. COVIDIEN may, in its sole discretion,
undertake to incorporate such changes and distribute the Software so modified to all or
any of COVIDIEN's customers. All such error corrections, bug fixes, patches, updates or
other modifications provided to COVIDIEN shall be the sole property of COVIDIEN.
This Software License is effective until terminated. Customer may terminate this License at
any time by destroying all copies of Software including any documentation. This License
will terminate immediately upon notice from COVIDIEN if Customer fails to comply with
any provision of this License or any supplier agreement. COVIDIEN may terminate the
Software licenses granted herein and exercise all available rights by giving written notice,
effective immediately, if within ten (10) business days of Customer’s receipt of a reasonably
detailed written request to cure, Customer has not cured all breaches of this License’s
limitations or restrictions. Upon such termination, Customer will immediately pay all
undisputed fees outstanding, cease use of all Software, return or delete, at COVIDIEN’s
request, all copies of the Software in Customer’s possession, and certify compliance with
all of the obligations herein to COVIDIEN in writing.
Limited Warranty: COVIDIEN represents and warrants to Customer that the Software
will perform substantially as described in COVIDIEN's then current documentation for such
Software for the longer of (a) the remaining warranty applicable to the product with which
such Software was delivered (not to exceed one year) or (b) ninety (90) days from the date
such Software was shipped or first made available to Customer for electronic download
from COVIDIEN’s service site. If you notify COVIDIEN of defects during the warranty
period, COVIDIEN will replace the Software or, at its option, refund the purchase price.
Your remedy for breach of this limited warranty shall be limited to replacement or refund
and shall not encompass any other damages. No dealer, distributor, agent or employee of
COVIDIEN is authorized to make any modification or addition to the warranty and
remedies stated above.
Notwithstanding these warranty provisions, all of COVIDIEN's obligations with respect to
such warranties shall be contingent on Customer’s use of the Software in accordance with
this Agreement and in accordance with COVIDIEN's instructions as provided by COVIDIEN
in the documentation, as such instructions may be amended, supplemented, or modified
by COVIDIEN from time to time. COVIDIEN shall have no warranty obligations with respect
to any failures of the Software which are the result of accident, abuse, misapplication,
extreme power surge or extreme electromagnetic field.
This warranty does not apply to any damages, malfunctions, or non-conformities caused
to or by: (i) Customer’s use of Software in violation of the license granted under the
Agreement or in a manner inconsistent with any provided documentation; (ii) use of non-
COVIDIEN furnished equipment, software, or facilities with its equipment or Products; (iii)
Customer’s failure to follow COVIDIEN’s installation, operation, repair or maintenance
instructions; (iv) Customer’s failure to permit COVIDIEN timely access, remote or
otherwise, to Products; (v) failure to implement all new Updates to Software provided
under the Agreement; (vi) Products or equipment with their original manufacturer’s serial

SurgiStat Low-Power Electrosurgical Generator Service Manual vii
Software License
numbers altered, defaced or deleted; (vii) Products or equipment that have been altered,
serviced or modified by a party other than COVIDIEN; or (viii) Software that has been
subjected to abnormal physical or electrical stress, misuse, negligence or accident by
Customer or a third party.
DISCLAIMER: EXCEPT AS SPECIFIED IN THIS WARRANTY, ALL EXPRESS OR IMPLIED
CONDITIONS, REPRESENTATIONS, AND WARRANTIES INCLUDING, WITHOUT LIMITATION,
ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
OR ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE, ARE HEREBY
EXCLUDED TO THE EXTENT ALLOWED BY APPLICABLE LAW.
IN NO EVENT WILL EITHER PARTY BE LIABLE FOR ANY LOST REVENUE, PROFIT, OR DATA,
OR FOR SPECIAL, INDIRECT, CONSEQUENTIAL, INCIDENTAL, OR PUNITIVE DAMAGES
HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY ARISING OUT OF
THIS SOFTWARE LICENSE EVEN IF SUCH PARTY HAS BEEN ADVISED OF THE POSSIBILITY
OF SUCH DAMAGES. IN NO EVENT SHALL ONE PARTY’S LIABILITY TO THE OTHER PARTY,
WHETHER IN CONTRACT, TORT (INCLUDING NEGLIGENCE), OR OTHERWISE, EXCEED THE
PRICE PAID OR TO HAVE BEEN PAID BY CUSTOMER. THE FOREGOING LIMITATIONS SHALL
APPLY EVEN IF THE ABOVE-STATED WARRANTY FAILS OF ITS ESSENTIAL PURPOSE. SOME
STATES DO NOT ALLOW LIMITATION OR EXCLUSION OF LIABILITY FOR CONSEQUENTIAL
OR INCIDENTAL DAMAGES.
U.S. Government Rights. The Software is a “commercial item” developed exclusively at
private expense, consisting of “commercial computer software” and “commercial
computer software documentation” as such terms are defined or used in the applicable
U.S. acquisition regulations. The Software is licensed hereunder (i) only as a commercial
item and (ii) with only those rights as are granted to all other customers pursuant to the
terms and conditions of this License. Customer shall not use, duplicate, or disclose the
Software in any way not specifically permitted by this License. Nothing in this License
requires COVIDIEN to produce or furnish technical data for or to Customer.
If any provision of this Agreement shall be held by a court of competent jurisdiction to be
illegal, invalid or unenforceable, the remaining provisions shall remain in full force and
effect.
This License Agreement contains the entire understanding and agreement between the
parties respecting the Software. This Agreement may not be supplemented, modified,
amended, released or discharged except by an instrument in writing signed by each party's
duly authorized representative. All captions and headings in this Agreement are for
purposes of convenience only and shall not affect the construction or interpretation of any
of its provisions. Any waiver by either party of any default or breach hereunder shall not
constitute a waiver of any provision of this Agreement or of any subsequent default or
breach of the same or a different kind.
The construction and performance of this Agreement will be governed by the laws of the
State of Colorado without reference to its choice of law principles. The parties hereby
submit to the jurisdiction of the courts of the State of Colorado.

Contents
SurgiStat Low-Power Electrosurgical Generator Service Manual ix
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
Safety Precautions When Operating the Generator . . . . . . . . . . . ii
Conventions Used in this Guide . . . . . . . . . . . . . . . . . . . . . . . . . . .iii
Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iv
Software License . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Chapter 1. Introduction
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Generator Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Safety Precautions When Testing the Generator. . . . . . . . . . . . 1-3
General Warnings, Cautions, and Notices . . . . . . . . . . . . . 1-3
Active Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Fire/Explosion Hazards . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Generator Electric Shock Hazards . . . . . . . . . . . . . . . . . . . 1-7
Servicing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Chapter 2. Controls, Indicators, and Receptacles
Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Cut and Blend Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Coag and Bipolar Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Power Switch and Receptacles . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Rear Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Symbols on the Front Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Symbols on the Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Chapter 3. Technical Specifications
Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Input Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Duty Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Dimensions and Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Operating Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Audio Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Activation Tone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Patient Return Electrode Sensing. . . . . . . . . . . . . . . . . . . . 3-4
Low Frequency (50–60 Hz) Leakage Current . . . . . . . . . . . 3-5

xSurgiStat Low-Power Electrosurgical Generator Service Manual
High Frequency (RF) Leakage Current . . . . . . . . . . . . . . . . 3-5
Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Standards and IEC Classifications . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Class I Equipment (IEC 60601-1) . . . . . . . . . . . . . . . . . . . . . 3-6
Type CF Equipment (IEC 60601-1)/Defibrillator Proof. . . . 3-6
Drip Proof (IEC 60601-2-2) . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Electromagnetic Interference . . . . . . . . . . . . . . . . . . . . . . 3-6
Voltage Transients (Emergency Generator
Mains Transfer) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Electromagnetic Compatibility (IEC 60601-1-2 and
IEC 60601-2-2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
EMC Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Output Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Maximum Output for Bipolar and Monopolar Modes . . 3-12
Output Power Curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Output voltage (Vpeak) vs. power setting (Cut, Coag). . 3-13
Output voltage (Vpeak) vs. power setting (Bipolar) . . . . 3-14
Output power vs. power settings for all modes . . . . . . . 3-14
Output power vs. impedance for Cut mode . . . . . . . . . . 3-15
Output power vs. impedance for Blend mode . . . . . . . . 3-15
Output power vs. impedance for Desiccate mode . . . . . 3-16
Output power vs. impedance for Fulgurate mode . . . . . 3-16
Output power vs. impedance for Bipolar mode . . . . . . . 3-17
Reference Output Waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
Cut Mode Waveform. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
Blend Mode Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
Desiccate Mode Waveform . . . . . . . . . . . . . . . . . . . . . . . . 3-18
Fulgurate Mode Waveform . . . . . . . . . . . . . . . . . . . . . . . 3-19
Bipolar Mode Waveform . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
Chapter 4. Theory of Operation
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Functional Overview of Key Circuits . . . . . . . . . . . . . . . . . . . . . . 4-2
Power Factor Correction Circuit (PFC) . . . . . . . . . . . . . . . . 4-2
High-Voltage DC Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Low-Voltage DC Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Temperature-Sensing Circuit . . . . . . . . . . . . . . . . . . . . . . . 4-3
Speaker Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Diagnostic Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Patient Return Electrode Sensing Circuit . . . . . . . . . . . . . . 4-3
RF Amplifier Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Monopolar Select Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

SurgiStat Low-Power Electrosurgical Generator Service Manual xi
Monopolar/Bipolar Select Relays . . . . . . . . . . . . . . . . . . . . 4-4
Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Digital PWM Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
System Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
SurgiStat Control Signal Inputs and Outputs . . . . . . . . . . . . . . . 4-5
Chapter 5. Generator Operation
Inspecting the Generator and Accessories . . . . . . . . . . . . . . . . . 5-2
Service Personnel Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Installation and Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Functional (Operational) Checks . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
How to Set Up and Start the SurgiStat . . . . . . . . . . . . . . . 5-4
Setting Up for Monopolar Surgery . . . . . . . . . . . . . . . . . . 5-5
Setting Up for Bipolar Surgery . . . . . . . . . . . . . . . . . . . . . . 5-7
Operating the Generator . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Chapter 6. Maintaining the Generator
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Periodic Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Fuse Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Chapter 7. Troubleshooting
Recommended Equipment for Troubleshooting . . . . . . . . . . . . 7-2
Troubleshooting the Generator . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Inspecting the Generator . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Inspecting the Receptacles . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Understanding Error Codes and Audio Tones . . . . . . . . . . . . . . 7-4
Correcting Common Problems . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7
Chapter 8. Repair Policy and Procedures
Responsibility of the Manufacturer . . . . . . . . . . . . . . . . . . . . . . 8-2
Returning the Generator for Service . . . . . . . . . . . . . . . . . . . . . 8-2
Step 1 – Obtain a Return Authorization Number . . . . . . . 8-2
Step 2 – Clean the Generator . . . . . . . . . . . . . . . . . . . . . . . 8-3
Step 3 – Ship the Generator . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Service Centers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Chapter 9. Board Drawings and Schematics
Main Board Top Level Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2
Main Board RF Amplifier Circuit . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
Main Board Power Supply Block . . . . . . . . . . . . . . . . . . . . . . . . . 9-4
Main Board Isolated Power Factor Corrector Circuit . . . . . . . . . 9-5

xii SurgiStat Low-Power Electrosurgical Generator Service Manual
Main Board Logic Power Supply Circuit . . . . . . . . . . . . . . . . . . . 9-6
Main Board Audio Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-7
Display Board Top Level Block. . . . . . . . . . . . . . . . . . . . . . . . . . . 9-8
Display Board Diagnostic Circuit . . . . . . . . . . . . . . . . . . . . . . . . . 9-9
Display Board Neutral Electrode Monitoring Circuit . . . . . . . . 9-10
Display Board Control Logic Circuit . . . . . . . . . . . . . . . . . . . . . 9-11
Connector Panel Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-12
High Voltage Relay Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-13
Printed Circuit Board 1 Main Board PCB Top View . . . . . . . . . 9-14
Printed Circuit Board 2 Main Board PCB Bottom View . . . . . . 9-15
Printed Circuit Board 3 Display Board PCB (Top and
Bottom View) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-16
Printed Circuit Board 4 High Voltage Relay PCB (Top and
Bottom Views) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-17
Printed Circuit Board 5 Connector Panel PCB (Top and
Bottom Views) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-18
Assembly Drawing 1 SurgiStat Final Assembly. . . . . . . . . . . . . 9-19
Assembly Drawing 2 SurgiStat Front Panel Assembly . . . . . . . 9-20
Assembly Drawing 3 SurgiStat Back Panel Assembly. . . . . . . . 9-21

Chapter 1
SurgiStat Low-Power Electrosurgical Generator Service Manual 1-1
Introduction
This section includes the following information:
• Functional Description
• Generator Description
•Safety
Precaution
Read all warnings, cautions, and instructions provided with this generator before using.
Read the instructions, warnings, and cautions provided with electrosurgical accessories before
using. Specific instructions are not included in this manual.

1-2 SurgiStat Low-Power Electrosurgical Generator Service Manual
Functional Description
Functional Description
The SurgiStat Low-Power Electrosurgical Generator is a multipurpose electrosurgical
generator for use in physician’s offices and surgi-centers. It provides unsurpassed
performance, flexibility, reliability, and user convenience in one compact package.
The SurgiStat includes digital technology. This new technology is evident in the self-
checking circuitry and error code readouts. The generator offers monopolar and bipolar
electrosurgical operations.
The following are SurgiStat key advantages and benefits.
Power Capabilities Up to 120 watts (W) of Pure Cut @ 500 ohms (Ω).
Up to 90 W of Blend @ 800 Ω.
Up to 80 W of Desiccation @ 1000 Ω.
Up to 40 W of Fulguration @ 1000 Ω.
Up to 30 W of Bipolar @ 200 Ω.
Two Levels of Coagulation:
Desiccation and Fulguration
Desiccation provides precise control of bleeding in
localized areas.
Fulguration provides greater control of bleeding in highly
vascular tissue over broader tissue surface areas.
Return Electrode Monitoring
System
The generator incorporates a return electrode contact
quality monitoring system (Bovie NEMTM*). This system
determines the type of patient return electrode attached
(single-plate or split-plate).
It also continuously monitors the contact impedance
between the patient and the split-plate patient return
electrode.
Contact impedance is monitored only when approved
split-plate patient return electrodes are used.
Memory The generator powers up to the last selected modes and
their last selected power settings.
Isolated (Floating) Radio
Frequency (RF) Output
This minimizes the potential of alternate-site burns.
Standard Front Panel
Connectors
These connectors accept the latest monopolar and bipolar
instruments.
Self Diagnostics These diagnostics continually monitor the generator to
ensure proper performance.
Whenever they detect a problem, medical personnel
receive audible and visual alarm responses, and the output
is suspended until the alarm condition is cleared.

SurgiStat Low-Power Electrosurgical Generator Service Manual 1-3
Generator Description
Introduction
Generator Description
The SurgiStat Low-Power Electrosurgical Generator is a self-contained generator,
consisting of the main enclosure and power cord. The main components incorporated in
the generator are:
•Front Panel Components – Power switch, two dials for controlling power output,
membrane switches for selecting modes, receptacles for connecting electrosurgical
accessories, and indicators that show the current settings and patient return electrode
status.
•Rear Panel Components – Volume control, footswitch receptacle, power cable
receptacle and fuse holder, and equipotential grounding lug.
•Internal Components – Display board, main board, pad sensing module, speaker
board, and relay board.
Safety Precautions When Testing the Generator
Before testing this generator it is important that you read, understand, and follow the
instructions supplied with it. Also, be familiar with any other equipment used to install and
test the generator.
General Warnings, Cautions, and Notices
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 are designed to accept only one instrument at a time.
Do not attempt to connect more than one instrument at a time into a given receptacle. Doing so
will cause simultaneous activation of the instruments.
To reduce the potential for alternate site burns, do one or more of the following:
• Avoid skin-to-skin contact points, such as fingers touching leg, when positioning the patient.
• Place 5 to 8 cm (2 to 3 in.) of dry gauze between contact points to ensure that contact does
not occur.
• Position the patient return electrode to provide a direct current route between the surgical
site and the return electrode which avoids skin-to-skin contact areas.
• In addition, place patient return electrodes according to the manufacturer’s
instructions.Potential for alternate site burns increases if the return electrode is compromised.
Covidien recommends the use of split patient return electrodes with a contact quality
monitoring system.

1-4 SurgiStat Low-Power Electrosurgical Generator Service Manual
Safety Precautions When Testing the Generator
Do not wrap the accessory cords or patient return electrode cords around metal objects. This may
induce currents that could lead to shocks, fires, or injury to the patient or surgical team.
Failure of the high-frequency surgical equipment could result in an unintended increase of output
power.
Use the lowest output setting necessary to achieve the desired surgical effect. Use the active
electrode only for the minimum time necessary in order to lessen the possibility of unintended burn
injury. Pediatric applications and/or procedures performed on small anatomic structures may
require reduced power settings. The higher the current flow, and the longer the current is applied,
the greater the possibility of unintended thermal damage to tissue, especially during use on small
structures.
Avoid using power settings that would exceed the highest maximum voltage that is acceptable for
each accessory. Choose only accessories that will withstand each mode and power setting.
Use electrosurgery with caution in the presence of internal or external devices such as pacemakers
or pulse generators. Interference produced by the use of electrosurgical devices can cause devices
such as pacemakers to enter an asynchronous mode or can block the pacemaker effect entirely.
Consult the device manufacturer or hospital Cardiology Department for further information when
use of electrosurgical appliances is planned for patients with cardiac pacemakers or other
implantable devices.
In some circumstances, potential exists for alternate site burns at points of skin contact (e.g.,
between the arm and the side of the body). This occurs when electrosurgical current seeks a path
to the patient return electrode that includes the skin-to-skin contact point.
Current passing through small skin-to-skin contact points is concentrated and may cause a burn.
This is true for grounded, ground referenced, and isolated output generators.
Precaution
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 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 electrical
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.
At no time should you touch the active electrode or bipolar forceps. A burn could result.
Non-function of the generator may cause interruption of surgery. A backup generator should be
available for use.
When using a smoke evacuator in conjunction with the electrosurgical generator, place the smoke
evacuator a distance from the generator and set the generator volume control at a level that
ensures that the activation tones can be heard.
Warning

SurgiStat Low-Power Electrosurgical Generator Service Manual 1-5
Safety Precautions When Testing the Generator
Introduction
Active Accessories
When high-frequency surgical equipment and physiological monitoring equipment are used
simultaneously on the same patient, place any monitoring electrodes as far as possible from the
surgical electrodes.
Do not use needles as monitoring electrodes during electrosurgical procedures. Inadvertent
electrosurgical burns may result.
To avoid the possibility of an electrosurgical burn to either the patient or the physicians, do not
allow the patient to come in contact with a grounded metal object during activation. When
activating the unit, do not allow direct skin contact between the patient and the physician.
To avoid the possibility of a burn to the patient, when using a split pad do not activate the unit if
the solid pad indicator is illuminated green or the red alarm indicator remains illuminated red. This
could indicate improper pad placement or a faulty NEM circuit.
Remove any loose fitting jewelry from the patient before activation.
Examine all accessories and connections to the electrosurgical generator before use. Ensure that
the accessories function as intended. Improper connection may result in arcs, sparks, accessory
malfunction, or unintended surgical effects.
When not using active accessories, place them in a holster or in a clean, dry, nonconductive, and
highly visible area not in contact with the patient. Inadvertent contact with the patient may result
in burns.
Studies have shown that smoke generated during electrosurgical procedures can be potentially
harmful to patients and the surgical team. These studies recommend adequately ventilating the
smoke by using a surgical smoke evacuator or other means.1
1. U.S. Department of Health and Human Services. National Institute for Occupational Safety and
Health (NIOSH). Control of Smoke from Laser/Electric Surgical Procedures. HAZARD CONTROLS,
Publication No. 96-128, September, 1996.
Notice
If required by local codes, connect the generator to the hospital equalization (grounding)
connector with an equipotential cable.
Connect the power cord to a wall receptacle having the correct voltage. Otherwise, product
damage may result.
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.
Precaution

1-6 SurgiStat Low-Power Electrosurgical Generator Service Manual
Safety Precautions When Testing the Generator
Fire/Explosion Hazards
Precaution
Accessories must be connected to the proper receptacle type. In particular, bipolar accessories must
be connected only to the bipolar instrument receptacle. Improper connection may result in
inadvertent generator activation or a contact quality monitor alarm.
Set power levels to the lowest setting before testing an accessory.
Notice
During bipolar electrosurgery, do not activate the generator until the forceps have made contact
with the patient. Product damage may occur.
Warning
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/Explosion Hazard—The following substances will contribute to increased fire and explosion
hazards in the operating room:
• Flammable substances (such as alcohol based skin prepping agents and tinctures)
• Naturally occurring flammable gases which may accumulate in body cavities such as the bowel
• Oxygen-enriched atmospheres
• Oxidizing agents (such as nitrous oxide [N20] atmospheres).
The sparking and heating associated with electrosurgery can provide an ignition source. Observe
fire precautions at all times. When using electrosurgery in the same room with any of these
substances or gases, prevent their accumulation or pooling under surgical drapes, or within the
area where electrosurgery is performed.
The use of flammable anesthetics or oxidizing gases such as nitrous oxide (N2O) and oxygen should
be avoided if a surgical procedure is carried out in the region of the thorax or the head, unless these
agents are evacuated.
Non-flammable agents should be used for cleaning and disinfection wherever possible.