Eschmann TD-830 Service manual

TD830
E LECT RO SURGICAL UNIT
Service Manual
698260
E-SM44h
Preliminary Information
Read these Instructions before use
Keep this ‘Service Manual’ in a safe convenient place for future reference. Read in conjunction with the relevant Publications detailed in the preliminary information section.
Safety notes
and alarms
Introduction
Description
Maintenance
Illustrated parts list
Eschmann After Sales Service Department
The Eschmann After Sales Service Department is staffed and equipped to provide advice and assistance during normal office hours. To avoid delays when making enquiries, please quote the Model and Serial Number of your Electrosurgical Unit which is shown on the Serial Number plate, the location of which is shown below. Please ensure you include all alpha and numeric digits of the Serial Number.
The Serial Number plate is located here, (view from rear of unit).
For further information visit www.eschmann.co.uk
All correspondence relating to the after sales service of Eschmann Equipment to be addressed to :
UK Customers
Eschmann Equipment, Peter Road, Lancing, West Sussex BN15 8TJ, England. Tel: +44 (0) 1903 765040. Fax: +44 (0) 1903 875711.
Overseas Customers
Contact your local distributor. In case of doubt contact Eschmann Equipment.
Patents and Trade marks
The ESCHMANN name and logo are trade marks of Eschmann Holdings Limited. “Eschmann Equipment” is a trading name of Eschmann Holdings Limited. “TD830” and “Flexoplate” are trade marks of Eschmann Holdings Limited.
Patents : GB2276551, GB2146534, AU673883, ZA94/2173, US5480399,
EP617925, IEE69100 and other Patents Pending.
Copyright © 2008 Eschmann Holdings Limited
All rights reserved. This booklet is protected by copyright. No part of it may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise without written permission from Eschmann Holdings Limited. The information in this publication was correct at the time of going to print. The Company, however, reserves the right to modify or improve the equipment referred to.
The CE marking affixed to the product certifies that it complies with the European Medical Devices Directive 93/42/EEC and related legislation.
Service Manual
E-SM44h July 2008
CONTENTS
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ELECTROSURGICAL UNIT
1.0 PRELIMINARY INFORMATION
Preliminary information . . . . . . . . . . . . . . . . . . . . . . . . 4
2.0 TECHNICAL DATA
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Audible indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Visual indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Safety.. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Duty cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Other symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Button symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Alarm symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Environmental conditions . . . . . . . . . . . . . . . . . . . . . . . 8
3.0 SAFETY NOTES & ALARMS
Do’s and Don’ts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Alarm circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.0 INTRODUCTION
General .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Operating modes / display option.. . . . . . . . . . . . . . . . 11
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Associated Publications . . . . . . . . . . . . . . . . . . . . . . . 11
Equipment certification . . . . . . . . . . . . . . . . . . . . . . . 11
Servicing .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.0 DESCRIPTION
Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Sub assembly descriptions . . . . . . . . . . . . . . . . . . . . 14
Front panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Rear panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Mains transformer & rectification assy. . . . . . . . . . 15
Main printed circuit board assembly . . . . . . . . . . . 15
Patient interface PCB . . . . . . . . . . . . . . . . . . . 15
Patient interface (plate) PCB . . . . . . . . . . . . . . 16
Tone generator PCB . . . . . . . . . . . . . . . . . . . . 16
PSU PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Bipolar PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Crowbar PCB . . . . . . . . . . . . . . . . . . . . . . . . . 16
PCM DC regulator PCB . . . . . . . . . . . . . . . . . . 17
Monopolar Power Amplifier PCB . . . . . . . . . . . 17
Spray and Monopolar PCB . . . . . . . . . . . . . . . 17
Relay PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Logic and pulse PCB . . . . . . . . . . . . . . . . . . . . 18
Power output graphs . . . . . . . . . . . . . . . . . . . . . . . . . 18
Monopolar cut diagrams . . . . . . . . . . . . . . . . . . . . 19
Monopolar blend diagrams . . . . . . . . . . . . . . . . . . 20
Monopolar specialist cut diagrams . . . . . . . . . . . . 21
Monopolar pinpoint coag diagrams . . . . . . . . . . . . 22
Monopolar spray coag diagrams . . . . . . . . . . . . . . 23
Bipolar macro diagrams . . . . . . . . . . . . . . . . . . . . 24
Bipolar micro diagrams . . . . . . . . . . . . . . . . . . . . . 25
6.0 MAINTENANCE
Routine check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Systems check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Cleaning disinfection and care . . . . . . . . . . . . . . . . . . 26
Access for maintenance . . . . . . . . . . . . . . . . . . . . . . 26
Top cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Front panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Rear panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Removal and installation . . . . . . . . . . . . . . . . . . . . . . 26
Circuit board removal (except crowbar) . . . . . . . . 26
Crowbar board removal . . . . . . . . . . . . . . . . . . . . 26
Rivet removal/replacement . . . . . . . . . . . . . . . 26
Circuit board replacement . . . . . . . . . . . . . . . . . . . 27
Supply faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Fuse renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Fault finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Alarm remedies . . . . . . . . . . . . . . . . . . . . . . . . 27
Extender board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Frequency of calibration . . . . . . . . . . . . . . . . . . . . . . . 28
Performance checks . . . . . . . . . . . . . . . . . . . . . . . . . 28
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Output waveform timings . . . . . . . . . . . . . . . . . 28
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Timing measurements . . . . . . . . . . . . . . . . . . . 28
Monopolar output currents . . . . . . . . . . . . . . . . 29
Specialist cut boost check . . . . . . . . . . . . . . . . . . 29
Monopolar current limit check . . . . . . . . . . . . . . . . 29
Bipolar output current . . . . . . . . . . . . . . . . . . . . . . 29
Active relay function test . . . . . . . . . . . . . . . . . . . . . . 29
Set up overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
System diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.0 ILLUSTRATED PARTS LISTS
Illustrated parts list 1 . . . . . . . . . . . . . . . . . . . . . . . . . 36
Illustrated parts list 2 . . . . . . . . . . . . . . . . . . . . . . . . . 38
Illustrated parts list 3 . . . . . . . . . . . . . . . . . . . . . . . . . 40
Illustrated parts list 4 . . . . . . . . . . . . . . . . . . . . . . . . . 42
ILLUSTRATIONS
Fig. 1 Part identification . . . . . . . . . . . . . . . . . . . . . . . 13
Fig. 2 Using the extender board . . . . . . . . . . . . . . . . 28
Fig. 3 Monopolar mode timing (part 1) . . . . . . . . . . . 31
Fig. 4 Monopolar mode timing (part 2) . . . . . . . . . . . 32
Fig. 5 Biopolar mode timing . . . . . . . . . . . . . . . . . . . . 33
Fig. 6 TD830 System diagram . . . . . . . . . . . . . . . . . . 44
TABLES
Table 1 Mono & Bipolar timings . . . . . . . . . . . . . . . . . 30
Table 2 TD830 set up overview . . . . . . . . . . . . . . . . . 34
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1.0 PRELIMINARY INFORMATION
1.1 This Service Manual should be referred to for details of the TD830 Electrosurgical Unit, REF 83-256-01, 83-257-02, 83-258-03, 83-259-04, 83-260-05, 83-261-06, 83-262-07, 83-263-08, and 83-264-09 (serial number A9B0000 or above).
1.2 Within the text of this manual the term ‘coag’ is used as a common abbreviation of the term ‘coagulation’.
1.3 The TD830 Electrosurgical Unit requires a mains electrical supply corresponding to the voltage shown on the electrical rating plate at the rear of the unit. Only use the mains supply cable supplied. If the plug supplied pre­fitted is not suitable it should be replaced with a suitable plug with protective earthing contact.
1.4 If the plug is a fused type, a 10A fuse must be fitted.
CAUTION
It is most important that fuses of the correct type, size and rating are installed (see Technical Data).
CAUTION
Read this ‘Service Manual’ carefully and note ALL of the warnings, cautions and safety notes contained within. Keep this ‘Service Manual’ close-to-hand at all times for reference.
1.5 Ensure that the unit ‘mains’ switch (42 of Fig. 12) is in the ‘O’ position and that the output controls are set to minimum before connecting to, and switching ‘on’, the mains supply. A complete systems check must be carried out before using the Electrosurgery Unit (see the ‘Instructions for use’).
1.6 Instructions for Use and Service Manuals should be readily accessible for reference prior to and when operating, cleaning and servicing the TD830 Electrosurgical Unit. All manuals are available from Eschmann Equipment, see inside front cover for address details.
Related Technical Publications:-
Instructions for Use - TD830:
Publication number E-IM54, Part No. 698257
Eschmann accessory ‘Instructions for use’:
Publication number E-IM50, Part No.604802
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2. 0 TECHNICAL DATA
GENERAL
The TD830 Electrosurgical Unit (or Surgical Diathermy Unit) is classified as ‘HF surgical equipment’
1
- ‘HF surgical equipment’ is defined as, “Medical electrical equipment including its associated accessories intended for the performance of surgical operations, such as the ‘cutting’ 2 or ‘coagulation’ 3 of biological tissue by means of high frequency (h.f.) currents”.
2
- ‘Cutting’ is defined as, “Resection or dissection of body tissue caused by the passage of high frequency current of high current density at the active electrode(s)”.
3
- ‘Coagulation’ is defined as, “Sealing of small blood vessels or of body tissue caused by the passage of high frequency current at the active electrode(s)”.
Equipment - High power electrosurgical unit with monopolar and bipolar outputs
Type - Portable
DIMENSIONS
Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39.0 cm
Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.0 cm
Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42.5 cm
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 kg
1
Output (bipolar)
Peak
Open
Crest Circuit
Symbol/Function Power factor Voltage Coagulation
Micro range 17W ±20% Variable 150
Macro range 50W
Power and voltage output data diagrams are shown at the end of section 5.
+10%
-20%
Variable 230
Monopolar
Carrier frequency - 475kHz nominal, square wave. Power control - Variable amplitude set by frontpanel
controls. Preset pulse patterns set by mode switches. Load resistance for maximum output power is 150 ohms
(non-inductive) for cut and pinpoint coag and 200 ohms (non-inductive) for blend, specialist cut and spray coag.
Test load is 200 ohms (non-inductive) for cut and specialist cut and 400 ohms (non-inductive) for blend, spray coag and pinpoint coag.
ELECTRICAL DATA
(Note: Voltage factory set by transformer tapping, according to model supplied.)
Power Supply . . . . . . . . . . . . . . . . . . 230V a.c., 50-60Hz
or, 240V a.c., 50-60Hz or, 220V a.c., 50-60Hz or, 110V a.c., 50-60Hz
Current (max.) . . . . . . . . . 4.4A (230V) or, 4.2A (240V)
or, 4.6A (220V) or, 8.4A (110V)
Fuse rating (240V, 230V, 220V) . . . . . . . . . . . 250V, T5A
Fuse rating (110V) . . . . . . . . . . . . . . . 125V(min.),T10A
Fuse type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mm
Bipolar
Carrier frequency - 785kHz nominal, square wave. Power control - Variable pulse group modu-lation set
by front panel control. Amplitude set by micro/macro range buttons.
Load resistance for maximum output power
- 100 ohms (non-inductive) for Macro
- 50 ohms (non-inductive) for Micro
Output (monopolar)
Output powers are measured to an accuracy of ±20%, with a maximum power of 400 watts.
Peak
Open
Crest Circuit
Symbol/Function Power factor Voltage
Normal cut 345W(-20%) 1.9 1150
Blend 300W(±20%) 3.0 2200
Specialist cut 345W(-20%) 2.1 1500
Pinpoint coag. 170W(±20%) 5.1 2150
Spray coag. 79W(±20%) 8.7 4000
Power and voltage output data diagrams are shown at the end of section 5.
Test load - 100 ohms (non-inductive)
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AUDIBLE INDICATORS
SAFETY
Running tones * Monopolar
Cut, blend or specialist cut 950Hz Coagulation, pinpoint or spray 800Hz
Bipolar
Micro or macro 730Hz (* Approximate values, adjustable volume)
Touch button
A ‘bleep’ indicates when any function button is pressed, the volume is adjustable with running tones above.
Alarm
All modes - alternating two tone preset to maximum volume (with flashing display).
VISUAL INDICATORS
Green lamp in mains ‘on/off’ switch to indicate power ‘on’ from the rear of the electrosurgical unit.
Digital displays and ‘function selected’ LEDs indicate power ‘on’ from the front of the electrosurgical unit
Three digital displays indicate and bipolar modes. (Note: These can be set to display the
typical power*
to 10).
(
* typical power
delivered over a range of load resistances. It is less than the power delivered to the rated load for maximum power.)
available in watts, or a numerical value up
is an indication of the average power
typical power*
in cut, coag
General
Designed to comply with EN60601-1:1990 Medical electrical equipment - general requirements for safety and IEC60601-2-2: 1998 High-frequency surgical equipment ­particular requirements for safety (3rd edition).
General classification, Class 1, Type CF (Defibrillator proof). Drip-proof (IPX 1) Patient leakage (risk) current: always less than 100
microamps to earth (ground) from all patient circuits at 230V 50Hz as required by EN60601-1:1990 for the unit in normal condition (typically less than 10 microamps).
Battery
This equipment contains a nickel metal hydride battery. In the event of failure of the display p.c.b. battery, or if the electrosurgical unit is to be disposed of, it is not necessary to remove the battery or to return it to Eschmann Equipment. The battery charge life is six months from a full charge of 48 hours. The battery charges automatically when the unit is ‘on’.
Electrode isolation
The plate electrode circuit of this equipment is isolated from earth at both high and low frequency. The bipolar output is also fully isolated at both high and low frequency.
Class
Class 1 denotes that the equipment must be earthed via the protective conductor in the 3-core mains cable connected to a 3-pin plug.
Power output ‘activated’ LED indicators for:
Cutting modes Yellow lamp Coag modes Blue lamp Bipolar mode Blue lamp
Green and bright green function selected LED indicators above (or below) the relevant touch buttons detailed as follows:
Monopolar:
Cut, blend, specialist cut (green) Pinpoint coag (green) Spray coag (bright green)
Bipolar:
Micro and macro power range (green)
Safety category
This symbol denotes that the equipment is of type
CF, i.e. that it complies with type CF leakage current requirements. The symbol also denotes that the equipment will not be damaged by defibrillator discharge and that the plate electrode need not be removed from the patient if a defibrillator is used.
Non-ionizing radiation
This symbol warns the user of the possibility of non-
ionizing radiation being emitted by this equipment.
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Flammable gases
The TD830 equipment is not suitable for use in the presence of a flammable anaesthetic mixture with air or with Oxygen or Nitrous Oxide.
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ELECTROSURGICAL UNIT
The symbol on the rear panel serial plate warns the user to read the accompanying documents, the ‘Instructions for use’.
Protection
IPX 1 This symbol (drip proof) denotes that the
equipment meets the requirements of IEC529 for dripping water.
DUTY CYCLE
The duty cycle rating of 10 seconds ‘on’, 30 seconds ‘off’, specified on the serial plate as 10s:40s, indicates that the equipment can be used at full output power in any mode for 10 seconds with a 30 seconds rest period. The unit can remain connected to the mains electrical supply with the mains switch in the ‘on’ position continuously. The ‘on’ period at lower power levels can be extended.
OTHER SYMBOLS
Note: For numbers in brackets refer to Fig. 1.
This symbol above item (33) indicates the running
tone volume control which has a minimum sound level of 45dBA.
This symbol above items (1, 14, 21 and
33) indicates increasing power output (1, 14 and 21) and increasing volume (33) for running tone and ‘bleep’ volume.
The symbol above sockets (25, 26, 27 and 28) denotes connection socket for a two button electrode handle (fingerswitch type).
The symbol adjacent to sockets (24, 26 and 31) denotes connection socket for a non-switched active handle actuated by a footswitch.
This symbol on the monopolar standby selection button (32) (monopolar ‘on/off’ toggle button) indicates standby mode for part of the equipment only.
The symbols I and adjacent to the mains ‘on/off’ switch
(42) indicate the ON and OFF positions respectively.
The symbol adjacent to item (34) indicates the ‘equipotentiality’ connection point. (Means for connection of a potential equalization conductor).
The symbol adjacent to button (35) signifies the button in the non-pressed (i.e. normal) state. (Digital display on the front of the electrosurgical unit is a typical power figure, e.g. 0-200watts for monopolar blend).
This symbol on the rear panel serial plate (39) and above the mains inlet (40) indicates that the equipment is for use on alternating current only.
This symbol on the rear panel serial plate
indicates that the mains input fuses, rating and type, are as shown below the symbol.
The symbol on the front panel denotes that the plate electrode is isolated from earth at high frequency. (Note: The plate electrode is also known as the dispersive, neutral, return, indifferent or patient plate electrode and is often simply called the ‘pad’).
The symbol on the front panel adjacent to the active outputs (24 to 28) denotes dangerous voltages.
The symbol adjacent to button (35) signifies the button in the pressed (i.e. activated) state. (Digital display on the front of the electrosurgical unit shows a numerical value up to 10).
The symbol adjacent to sockets (36, 37 and 38) indicates the connection point for footswitches.
The symbol SN indicates serial number. The symbol REF indicates catalogue number.
The symbol indicates date of manufacture.
E-SM44h P7/44
BUTTON SYMBOLS
ENVIRONMENTAL CONDITIONS FOR TRANSPORT AND STORAGE
Press to select bipolar - micro range
Press to select bipolar - macro range
Press to select monopolar - cut
Press to select monopolar - blend
Press to select monopolar - specialist cut
Press to select monopolar - pinpoint coag.
Press to select monopolar - spray coag.
Ambient temperature range:
-30°C to +50°C
Relative humidity range:
30-90% RH non-condensing
Atmospheric pressure range:
1060hPa down to 690hPa
ALARM SYMBOLS
PCM - Indicates the ‘Plate continuity monitor’ alarm has
been activated.
PAM - Indicates the ‘Plate attachment monitor’ alarm
has been activated.
PEM - Indicates the ‘Patient earth monitor’ alarm has
been activated.
PVM - Indicates the ‘Plate voltage monitor’ alarm has
been activated.
EPM - Indicates the ‘Excess power monitor’ alarm has
been activated.
- Indicates the ‘Multiple activation’ alarm has been
activated.
! - Indicates an internal fault has been detected (see section
5, Alarm conditions, in the ‘Instructions for Use’, for details).
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3.0 SAFETY NOTES & ALARMS
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ELECTROSURGICAL UNIT
Attention to the following points is necessary in order to reduce the risk of accidental burns during the use of this electrosurgical unit. Other safety notes and warnings are also given within the text of this manual and these should be noted before using this electrosurgical unit.
DO:
Use only Eschmann accessories, in particular active
and plate electrodes and cables which should preferably be no more than 3 metres in length. All Eschmann accessories are rated above the corresponding maximum peak output voltage of this electrosurgical unit (see graphs in section 5). For reference Eschmann accessories can be used safely at the following h.f. peak voltages:
Bipolar active - 400 V peak Monopolar active - 4000 V peak Monopolar plate electrode - 2250 V peak
Use bipolar techniques in preference to monopolar,
whenever possible. For surgical procedures on parts of the body having a relatively small cross-sectional area, the use of bipolar techniques may be desirable to avoid unwanted coagulation.
Seek approved qualified advice (e.g. cardiology
department) before using this electrosurgical unit on patients with implanted pacemakers or other active implants to avoid interference or damage to the implant. Monitor such patients carefully.
Set power output controls to the minimum setting
before use and select the minimum power setting to achieve the desired effect.
Check all cables and accessories routinely before
use. In particular, electrode cables and endoscopically used accessories for possible damage to the insulation.
Ensure the entire area of the plate electrode is reliably
attached to the patient’s body and as close to the operating field as possible.
Store temporarily unused active electrodes such that
they are isolated from the patient [e.g. use a quiver (REF 83-186-38) to hold active accessories when not in use].
DO NOT:
Do not use uninsulated forceps, monopolar or bipolar. Do not place monitoring electrodes close to the
operating site. When high frequency surgical equipment (i.e. electrosurgical equip-ment) and physiological monitoring equip-ment are used simultaneously on the same patient, any monitoring electrodes should be placed as far as possible from the surgical electrodes. Needle monitoring electrodes are not recommended. In all cases, monitoring systems incorporating high frequency current limiting devices are recommended.
Do not allow active cables to drape across or contact
the patient's body or contact the cables or leads of other equipment.
Do not use flammable anaesthetics, flammable
solvents or oxidizing gases such as nitrous oxide (N2O) or oxygen if the surgical procedure is carried out in the region of the thorax or head, unless these agents are sucked away.
Do not allow the patient's body to touch conductive
objects. The patient should not come into contact with metal parts which are earthed or which have an appreciable capacitance to earth, e.g. operation table, supports, etc. The use of antistatic sheeting is recommended for this purpose.
Do not use hook type active cables (with or without
adapters designed for use with hook type cables) use 4 mm or 8 mm plug type active cables.
Do not reuse disposable plate electrodes. Do not rely solely on surgical gloves to provide
insulation.
Do not allow ‘skin-to-skin’ contact (e.g. between the
arms and body of the patient), this can be avoided, for example by the insertion of adequate dry gauze.
E-SM44h P9/44
Attention to the following points will prolong the life and efficiency of your electrosurgical unit and will help to avoid the risk of accidents, or damage:
DO:
Switch off and disconnect from the mains electrical
supply prior to cleaning the equipment and when it is not in use.
Grasp the connector(s) not the cable when connecting
and disconnecting cables and leads from the equipment.
Contact the hospital electronics engineer or Eschmann
After Sales Service Department if the equipment fails to function after checking.
Ensure the equipment is serviced regularly (at least
every six months). Contact Eschmann After Sales Service Department for details.
DO NOT:
Use a faulty unit as failure could result in an unintended
increase of output power.
Service this equipment unless you are suitably qualified
to do so.
Alarm Circuits
3.1 The unit has several alarm circuits as detailed in the following sections.
Plate Continuity Monitor (PCM).
3.2 Ensures that the unit cannot be used in the monopolar mode with an electrically defective plate electrode or cable. It does not monitor the contact between the plate electrode and the patient’s body. It is reset automatically when a satisfactory plate electrode and cable are connected to the unit.
Patient Earth Monitor (PEM).
3.5 The PEM circuit detects a low impedance path between the patient and earth. It also reduces the chances of secondary contact electrosurgical burns. The circuit detects earth contact paths while the plate electrode is attached to the patient and the unit, when a monopolar fingerswitch or footswitch is pressed, but before the monopolar output is activated. If such an earth path is present, the alarm will operate until the path has been removed and the unit reset by reactivating a pressed monopolar footswitch or fingerswitch.
Plate Voltage Monitor (PVM).
3.6 Is designed to prevent dangerous electrosurgical voltages appearing on the patient’s body. Such voltages could occur because of insulation faults in the active circuit or because the active electrode is in contact with an earthed object and could cause burns at points of contact between the patient and conductive objects. This alarm will operate when monopolar output power is ‘on’ and the fingerswitch or footswitch is operated. This monitor will not detect a poor contact between the plate electrode and the patient. Note: Under specific electrical conditions, with the plate electrode completely detached from the patient, the PVM could alarm.
Multiple Activation Alarm.
3.7 Operates if more than one fingerswitch or footswitch is pressed at the same time in a given user section (i.e. monopolar USER 1 or USER 2 or bipolar). It will automatically be reset when ALL activations have been released. This alarm will also operate if a footswitch or fingerswitch is being activated when the unit is switched ‘on’. (Note: This could indicate a damaged accessory locked in the ‘on’ position).
Internal error alarm
3.8 Operates if an internal fault arises such as power being detected when not enabled by a footswitch or fingerswitch.
Plate Attachment Monitor (PAM).
3.3 Ensures that the unit cannot be used in the monopolar mode if a divided plate electrode is attached to the patient’s body incorrectly. Applies only when a divided plate electrode is used and will not operate if monopolar is switched ‘off’ by the monopolar standby selection button.
Excess Power Monitor (EPM).
3.4 The unit monitors its output power in monopolar and bipolar modes, compares this with the maximum allowed power under single fault conditions and alarms, disabling output, if the delivered power exceeds the allowed value by more than a certain margin.
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4.0 INTRODUCTION
GENERAL
Note: For numbers in brackets refer to Fig. 1.
4.1 The TD830 electrosurgical unit provides two outputs both for high power monopolar cut and coag (on a first come first served basis), together with a separate output for bipolar coag. Bipolar coag output is available simultaneously with either monopolar output. The unit incorporates touch button controls, seven segment LED (light emitting diode) displays and LED visual indicators.
4.2 The digital displays can show two scale modes, one shows the shows a numerical value up to 10 (the latter is only displayed whilst digital display range selection toggle button (35) is held pressed).
Note: The power delivered depends on the resistance between the active electrode and the plate electrode (or between the tips of bipolar forceps) at the time the power is applied. This resistance can vary widely and many times per second during the application of h.f. output.
4.3 The unit incorporates several alarm code indicators as detailed in the Technical Data section. Innovative safety features include a divided plate electrode monitoring system called the Plate Attachment Monitor (PAM) as well as the standard Eschmann Plate Voltage Monitor (PVM), Patient Earth Monitor (PEM) , and Plate Continuity Monitor (PCM). An Excess Power Monitor (EPM) and a Multiple activation alarm are also included. A high frequency leakage control circuit is included in the monopolar mode.
4.4 Within this manual the terms USER 1 and USER 2 are used to distinguish between the two monopolar outputs. The bipolar output is fully independent of the monopolar output and can be considered as USER 3.
OPERATING MODES / DISPLAY OPTION
Monopolar mode
4.5 The monopolar operating mode offers a choice of fingerswitch or footswitch control of ‘cut’ or ‘coagulation’ outputs for USER 1. Fingerswitch operation utilises the Eschmann two-button fingerswitch whilst footswitch control requires the use of an active electrode handle in conjunction with one of a range of electrical footswitches.
Bipolar mode
4.6 Bipolar coag is an efficient method of effecting haemostasis, and closure of vessels such as Fallopian tubes. It is extremely safe to use, as the main current path is between the tips of the bipolar forceps and the tissue held between them is directly in view of the surgeon at all times.
4.7 A plate electrode is not required and safety is increased even further as two power range outputs are available allowing precise setting of the power output.
4.8 The bipolar mode of operation offers a choice of footswitch, electrical or pneumatic.
typical
power available in watts the second
Monopolar standby mode
4.9 The unit can be switched into monopolar standby mode, in which only bipolar power is available, using monopolar standby selection button (32). This button is a toggle switch, each press of the button will turn monopolar mode ‘on’ (if ‘off ’) or ‘off ’ (if ‘on’). This button (32) can be considered as an ‘on/off’ switch for monopolar, the advantage being that if only bipolar outputs are required and monopolar standby mode is selected, no plate electrode needs to be connected to the unit. (If monopolar standby mode is not selected for ‘bipolar use only’ and a patient plate electrode is not connected to the unit the PAM alarm or PCM alarm will activate). The unit is in monopolar standby mode when only the digital display for bipolar can be seen illuminated.
Digital display options
4.10 The digital displays normally show the available in watts. The digital displays can also show a numerical value up to 10 (maximum). To display the power setting as a numerical value up to 10 press and hold the digital display range selection button (35). The display will revert to the normal setting (and display the available in watts) when the button is released. (
* typical power
delivered over a range of load resistances. It is less than the power delivered to the rated load for maximum power.)
is an indication of the average power
typical power*
typical power*
ACCESSORIES
4.11 The equipment is designed to be used with the Eschmann range of active, plate and bipolar cables. The front panel is colour coded, PALE BLUE for bipolar, YELLOW for monopolar cut, blend and specialist cut, and BLUE for monopolar coag. For a list of all accessories see the ‘Instructions for use’.
ASSOCIATED PUBLICATIONS
4.12 This manual contains service and maintenance instructions for user servicable parts (PCBs are deemed to be none user serviceable) and an illustrated parts list. For detailed user instructions refer to the TD830 Instructions for Use, E-IM44 (part number 698257).
EQUIPMENT CERTIFICATION
4.13 The electrosurgical unit fully complies with the major international safety standards (see Technical Data). (Note: Tested at 230V).
CAUTION
This electrosurgical unit is to be operated
by medically qualified personnel only.
SERVICING
4.14 It is recommended that electrosurgical safety checks and routine servicing are carried out at regular intervals (every six months) and only by Eschmann trained personnel or Eschmann trained hospital engineers, otherwise the warranty could be infringed.
4.15 Read the information given in this manual carefully before using, cleaning, sterilizing, or servicing the electrosurgical unit.
E-SM44h P11/44
1 Power output control, BIPOLAR 2 MICRO BIPOLAR selected, indicator (green LED) 3 Touch button, MICRO BIPOLAR 4 MACRO BIPOLAR selected, indicator (green LED) 5 Touch button, MACRO BIPOLAR 6 BIPOLAR digital power display (green seven segment LEDs) 7 BIPOLAR, power activated indicator (blue LED) 8 MONOPOLAR CUT digital power display (green seven segment LEDs) 9 MONOPOLAR CUT, power activated indicator (yellow LED) 10 MONOPOLAR (normal cut) selected, indicator (green LED) 11 Touch button MONOPOLAR (normal cut) 12 MONOPOLAR (blend) selected, indicator (green LED) 13 Touch button MONOPOLAR (blend) 14 Power output control, MONOPOLAR (cut) 15 Touch button MONOPOLAR (specialist cut) 16 MONOPOLAR (specialist cut) selected, indicator (green LED) 17 MONOPOLAR COAGULATION (pinpoint) selected, indicator (green LED) 18 MONOPOLAR COAGULATION (spray) selected, indicator (bright green LED) 19 Touch button MONOPOLAR COAGULATION (pinpoint) 20 Touch button MONOPOLAR COAGULATION (spray) 21 Power output control MONOPOLAR COAGULATION 22 MONOPOLAR COAGULATION, power activated indicator (blue LED) 23 MONOPOLAR COAGULATION digital power display (green seven segment LEDs) 24 8mm active electrode socket USER 1 only (footswitch activation only) - red 25 Fingerswitch sockets (for use with active electrode socket 26) - black 26 4mm active electrode socket USER 1 (footswitch or fingerswitch activation) - red 27 Fingerswitch sockets (for use with active electrode socket 28) - black 28 4mm active electrode socket USER 2 (fingerswitch activation only ) - red 29 ‘S’ (scope) connector socket (for use with flexible endoscopes) 30 Plate electrode connector socket - black 31 Bipolar output socket - white 32 Monopolar standby selection button (monopolar ‘on/off’ toggle button) 33 Running tone volume control 34 Potential equalization point (see Technical Data section) 35 Digital display range selection button (display in watts if not held pressed) 36 Bipolar pneumatic (white) footswitch socket 37 Bipolar electric (white) footswitch socket 38 Sockets for monopolar footswitches (blue, yellow or combination blue and yellow) 39 Serial number plate 40 Mains cable connection socket 41 Mains fuses (see technical data) 42 Mains power on/off control (with internal green lamp)
A1 - PCM alarm activated LED A5 - EPM alarm activated LED A2 - PAM alarm activated LED A6 - MULTIPLE ACTIVATION alarm LED A3 - PEM alarm activated LED A7 - Internal error alarm activated LED A4 - PVM alarm activated LED
All alarms are accompanied by an audible two tone warning and the activated digital displays will flash (i.e. if in monopolar standby mode, only the bipolar digital display will flash).
Key to Figure 1
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Figure 1 - Part identification
E-SM44h P13/44
5.0 DESCRIPTION
CONSTRUCTION (See Fig. 6)
5.1 The TD830 Electrosurgical unit is made of four principle electronic sub assemblies as listed below :
Front panelRear panelMains transformer and rectification assemblyMain printed circuit board assembly
5.2 The front panel includes the display and control board, operator controls, finger switch inputs and the RF outputs.
5.3 The rear panel includes the foot switch interface, mains input switch and lamp, display control switch and the tone volume control.
5.4 The mains transformer and rectification assembly, fitted inside on the right hand side (when viewed from the front) on a metal base plate, provides mains isolation and voltage conversion, protection and a 180V d.c. rectified power feed to the RF power section.
5.5 The main printed circuit board assembly, positioned within the unit on the left hand side (when viewed from the front) fitted on a metal base plate, controls and supplies all the RF outputs.
SUB ASSEMBLY DESCRIPTIONS
(see Fig.6) Front panel
5.6 The front panel assembly comprises a main display and control board (see 5.7) with its buttons, LEDs and three 7 segment displays (Bipolar, Monopolar Cut and Monopolar Coag). There are three Potentiometer controls for setting RF power levels (Bipolar, Monopolar Cut and Monopolar Coag), a Bovie sensing microswitch and pivot assembly. The panel also includes the connectors and cabling for the four RF outputs (Plate, Bipolar, Mono1, Mono 2 and Bovie). There are two current sense toroids, the larger for leakage sensing and the smaller for output current sensing.
5.7 The main display and control board performs the following functions:-
i Uses the front panel control knobs to set the
maximum allowable power for each mode.
ii Allows mode selection (IC4) and display (IC8)
through 8 front panel buttons and associated LEDs (Bipolar Macro or Micro; Specialist Cut, Normal Cut or Blend; Pinpoint Coag. or Spray Coag. and Standby).
iii Provides the controls for all RF outputs through a
64-way ribbon cable (J6).
iv Provides alarm control and logic (IC6) and
illuminates an LED to indicate the type of Alarm.
v Provides three digital 7 segment displays (IC13, IC1,
IC5) for power levels of Bipolar, Cut and Coag.
vi Provides all logic for foot and finger switch controls
(IC12, IC11).
vii Provides Battery back up of the last mode selection
before switching off (BATT1, IC2,IC4).
viii Uses the Bovie sense microswitch to enable the RF
routing to the Bovi RF output for Mono user 1.
ix Provides CMOS (IC9, IC10) and open collector
drives (IC7) for the main printed circuit board assembly.
x Provides control signals as follows:
SPEC BLEND CUT SPRAY CUTMODE COAGMODE MONENABLE BIPENABLE BIP_LOW MONORELAY1_SEL PEM_RELAY MONORELAY2_SEL MONORELAYBOVI_SEL
xi Provides Tone Generator controls as follows:
BLEEP_TONE CUT_TONE COAG_TONE BIPOLAR_TONE ALARM_TONE
xii Receives Foot and Finger switch signals as follows:
FINGERCUT_1 FINGERCOAG_1 FINGERCUT_2 FINGERCOAG_2 FOOTCUT_1 FOOTCOAG_1 FOOTAIR_BIP FOOTELEC_BIP
xiii Receives alarm signals as follows:
PVM PAM PCM PEM MONOPWRDET BIP_EXCESS MONO_EXCESS ALARM SQUARE (from Tone generator).
5.8 The one set up potentiometer (VR1) is factory set at manufacture and does not need resetting during the life of the product.
Rear panel (see Fig. 6)
5.9 The rear panel provides connection to the mains a.c. supply via an IEC inlet (which includes fuses, switch and integral green lamp), also fitted to the rear panel are:
i A volume control potentiometer. ii A range switch. iii Two Monopolar footswitch circular multi-pin
connectors iv An electrical Bipolar footswitch connector. v A pneumatic Bipolar footswitch connector. vi The Rating and Serial Number plate.
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vii A 15 way interconnect cable (from the footswitches,
range switch, volume control and the Mother board of the main PCB Assembly).
viii Mains interconnect to the Mains Transformer
Assembly.
ix Safety earth strap for the rear panel.
5.10 The two Monopolar footswitch circular multi-pin connectors are wired together so that either of two footswitches can enable RF power.
5.11 The range switch selects either normal power levels or a 0–10 range when pressed (see the ‘Instructions for Use’ supplied with the unit).
Mains transformer & rectification assembly (see Fig.6)
5.12 The mains transformer and rectification assembly comprises a 50/60Hz mains transformer with several secondaries providing the following:
i 50 V a.c. (Bipolar low/Micro) and 75V a.c. (Bipolar
high/Macro) for the Bipolar Output.
ii 15 V a.c. (rms) for the +15V output supply from the
PSU board.
iii 15V a.c. (rms) for the -15V output supply from the
PSU board.
iv 5V a.c. (rms) for the +5V output supply from the
PSU board.
5.13 The above a.c. supplies are connected to the motherboard at SK12 through a 9-way cable and connector from the Transformer PCB. They are short circuit protected by thermistors, which recover when an overload is removed.
5.14 Another secondary provides the feed for a rectifier whose output from the PCB is through a 2-wire (P1) connection to a large reservoir capacitor fitted near the transformer. This provides a 180V d.c. power feed to the Monopolar outputs which are supplied from the capacitor to the mother board at SK13. This secondary is protected by an internal over temperature sensor. Fitted to the discharge resistor is a capacitor so that energy is drained away to make the capacitor safe when the mains power is switched off.
5.15 The mains input voltage is factory selected by links on the input connector P10.
Main printed circuit board assembly (see Fig. 6)
5.16 The main printed circuit board assembly comprises a motherboard assembly (Part No 715205) which supports the other boards that make up the main printed circuit board assembly. The motherboard provides the inter-board connections and power feeds to the other boards of this assembly and is positioned horizontally under them. The other boards are listed below and are detailed in their own sections:
Patient Interface (Active) PCBPatient Interface (Plate) PCB
Tone Generator PCBPSU PCBBipolar PCBCrowbar PCBPCM DC regulator PCBMonopolar Power Amplifier PCB
comprising the:
Spray and Monopolar PCB
which includes the:
Relay PCB Logic and pulse PCB
5.17 The motherboard receives power from the mains transformer (SK12), 180V d.c. power (SK13), control from the front panel (SK2) and the rear panel (SK14) and current (SK3) and leakage sensor (SK4) feedback. The rear panel footswitch circuitry has an isolated supply (IC3) and interface (IC’s 1 and 2) providing 250V AC isolation.
5.18 Capacitors are fitted to the motherboard (C1-2, C4­7, C10, C13-14, C15 A-I) to protect against RF interference.
Patient Interface (Active) PCB (Part No 715201)
5.19 This board is fitted in the front slot nearest the display board (SK3 of the Mother board). It receives a single Monopolar Active RF power feed on PL4-2.
5.20 It also receives control signals (MONORELAY_1, MONORELAY_2, MONORELAY_BOVI) and returns finger switch signals (FINGERCOAG_1, FINGERCUT_1, FINGERCOAG_2 and FINGERCUT_2) to the display board through the motherboard and the 64-way ribbon connector.
5.21 The Monopolar RF feed is routed by HV RF relays to one of three outputs: Mono1 (connector PL1 through Relay RL3), Mono2 (PL2, RL1) or Bovi (PL3, RL2). This is done under control from the display board (signal names MONORELAY_1, MONORELAY_2, MONORELAY_BOVI).
5.22 In addition to the RF power output feed to Monopolar 1 there are two finger switch control lines which allow activation of Cut or Coag RF power (PL1-2, PL1-1). These lines are supplied with a sensing drive signal (IC1, TR1, L1) through a transformer (TX10) and return to two opto­isolators (O11, O12). When a fingerswitch is pressed that line causes current to flow through the opto-isolator and activate the control signal from the PIA active board to the display board (signal names FINGERCOAG_1, FINGERCUT_1).
5.23 The same applies to Monopolar 2 (PL2-3, 4). (Opto­isolators O13, O14, signal names FINGERCOAG_2 and FINGERCUT_2).
5.24 Fingerswitch signals (FINGERCUT/COAG_1,_2) are returned to the Display board through the motherboard and the 64-way ribbon connector.
E-SM44h P15/44
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