The Evolution of Electrosurgery (ESU) Analyzer Test Technology
5th Generation ESU Analyzers Are Here
Presented By:
Mike ErwineESU-2000 Series Product Manager
BC Group International Inc.www.bcgroupintl.com
Special Thanks
Special thanks to Covidien/Valleylab, Conmed Electrosurgery, Erbe USA, Aaron Medical (Bovie), and
Synergetics for supplying support images and historical/technical information used in this presentation.
Notes Pages Available in PDF
Just provide an e-mail address or a business card….
Who is BC Group?• Started in 1988 in St. Louis, MO• Primary focus from 1988 through 2000 was to be a “One Stop Shop”
major distributor for test equipment needed by biomedical engineering departments– 75 different manufacturers represented
• The BC Biomedical brand of test equipment was launched in 2000– Limited scope of products
• BC Group was acquired by Dytec Corporation of St. Charles, MO in 2005– Launched aggressive product research and development strategy
• Strategy is to become a large market-share manufacturer through aggressive and innovative product development– Enhanced by medical device manufacturer strategic relationships
• Moved into a new 50,000 sq. ft. state of the art manufacturing facility in January, 2009 in St. Charles, MO– New business location well-suited for aggressive business growth for many years to
come
Who is Mike Erwine?• No stranger to the biomedical test equipment industry…
Who is Mike Erwine?• 30+ years experience in the biomedical industry
– 13 years developing & running biomedical engineering departments in hospitals
– 5 years ISO & consulting experience– 15 + years in biomedical test and measurement design and
manufacturing experience (commencing in 1990) in association with the following companies…• Dynatech Nevada Inc.• DNI Nevada Inc. (Lionheart Technology)• Bio-Tek Instruments (Lionheart Technology)• Dale Technology (post Fluke acquisition)• Fluke Biomedical (combined holdings of Lionheart Technology)• Metron USA (post Fluke acquisition)• Datrend Systems (Canada) (private-label products for Dynatech Nevada)
– Prior experiences in the biomedical market include…• Selling to small, medium and large size customers, including medical device
manufacturers, independent service organizations, government, hospital systems, etc.
• Biomedical test product and project management• Biomedical product hardware and software validation and testing
– Joined the BC Group team in January, 2006
• ESU Technology related experiences:– Commercial product launches
• Dynatech Nevada Model 454A• DNI Nevada Model 402A• Dale Technology Model DALE3000• Bio-Tek Instruments Model RF-303• Fluke Biomedical RF-303RS
• BC Biomedical ESU-2050, ESU-2050P, ESU-2300, ESU-2400
– Extensive development work in partnership with Valleylab (Tyco Healthcare / Covidien), Conmed, Erbe USA, Bovie, Synergetics, etc.
Who is Mike Erwine?
Let’s start with some basic FACTS about the electrosurgery industry…
• #1: Electrosurgery generator manufacturers use RF current measurement as their standard for research & development, product manufacturing, and service & calibration
• #2: RF current measurement through the test load is inherently more accurate than RF voltage measurement across the test load
• #3: Older generation ESU measurement technology heavily utilizes thermal converter technology and/or resistive/capacitive voltage divider circuitry
• #4: New 5th Generation ESU measurement technology utilizes advanced level digital signal processing (DSP) technology unlike any prior generation of analyzers
13 Essential Electrosurgery Industry Facts
13 Essential Electrosurgery Industry Facts
• #5: Major ESU generator manufacturers have been searching for a “next generation” ESU Analyzer technology platform for almost 10 years– They needed something better to meet the testing requirements of
current state of the art generators as well as future generators
• #6: There is a growing population of ESU generators in the marketplace that generate “pulsed output” waveforms– These cannot be measured with most legacy ESU Analyzers
• #7: Some of today’s ESU generators require analyzers that can measure up to 5,500 ma RF!
• #8: The number of discrete test loads required for test & calibration of some of the newer generators is climbing to unprecedented levels!
13 Essential Electrosurgery Industry Facts
• #9: Newer technology generators with embedded micro-computer controllers are totally firmware driven, and firmware updates or major subassembly replacements can often require a complete recalibration of the generator.
• #10: Most electrosurgery manufacturers specify a 1% of reading accuracy calibration device for use in calibrating their generators, especially their newest models.
• #11: There are generators in the market today that produce waveforms at 4 M Hz and higher… and more are on the way– Historically, fundamental output frequencies of most generators were
in the range of 500 K Hz to 700 K Hz
13 Essential Electrosurgery Industry Facts
• #12: The traditionally “loose” field test specifications (+/- 10% - +/- 20%) for output power tests have derived over the years based upon the relative poor performance and specifications of available test technology. This is changing with the availability of 5th generation technology.
• #13: For the past 20+ years, major electrosurgery manufacturers have utilized the Fluke Electronics Model 8920A Digital Wide Band Multimeter (discontinued in 1999 without replacement) instead of specialty ESU Analyzers. This is quickly changing with the current availability of a growing fleet of commercially available 5th Generation ESU Analyzers.
First – What are we measuring?
How has generator technology changed?Zoomed Look at Coag Waveform - Several Cycles
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Electrosurgery Generator Technology1926 - Present
19262008
Four distinct technology generations…
Electrosurgery Generator Technology1926 - Present
•William Bovie, Ph.D., Harvard, Physics, attached to the Harvard Cancer Commission; collaborated with Cushing in developing the “Bovie”
•Cushing was a graduate of Harvard Medical School (HMS)
•Cushing became Chair, Dept. of Surgery, HMS, is widely considered to be the “father of neurosurgery”
•Bovie ESU first used clinically at Peter Bent Brigham Hospital by Cushing on Oct. 1, 1926
Electrosurgery Generator Technology1926 - Present
•Quote from Cushing’s operative notes“With Dr. Bovie’s help, I proceeded to take off most satisfactorily the remaining portion of the tumor with practically none of the bleeding, which was occasioned in the preceding operation. The loop acted perfectly and blood stilling was almost complete, but whether we would venture to use anything of this kind in the brain tissue itself, I am at a loss to know because almost certainly it would cause convulsion.”
•Bovie collaborated with Liebel-Flarsheim of Cincinnati to build an operating room ES generator•Circa 1927, sold his patent to Liebel-Flarsheim for $1, left Harvard without tenure
Electrosurgery Generator Technology1926 - Present
1st Generation – The Bovie & Ground-Referenced Units
•RF energy via spark gap and vacuum tubes – first unit in 1926
•Ground referenced output
•No patient safety provisions (no REM/ARM circuitry)
•Open loop control
•User interface via knobs, dials
•Required frequent service (clean spark gaps)
•High output voltages
•Long service life, simple to repair
Electrosurgery Generator Technology1926 - Present
2nd Generation – Solid State Units
•Commencing in the mid 1970’s
•RF energy via Bipolar Transistors
•Isolated outputs but lower output voltages
•REM/ARM patient electrode monitoring
•Open loop control with voltage limiting
•Simple user interface via LED displays & pushbuttons
•Significant reduction in size and weight
•More difficult to repair – much more circuitry involved
3rd Generation – Tissue Effect Generators
•Commencing in the early 1990’s with Erbe’s ICC Series
•Isolated outputs + advancements in REM/ARM protection circuitry
•Error codes stored for diagnostic purposes
•RS232 communications interfaces
•RF energy output via MOSFET transistors
•Adaptive patient electrode monitoring
•Microprocessor based closed loop control of sinusoidal waveforms (Cut, Dessicate, Bipolar)
•More predictable tissue effect
Electrosurgery Generator Technology1926 - Present
4th Generation – “Smart” Advanced Level Generators
•Advanced level diagnostics and error code capability via embedded micro computers
•Isolated outputs & advanced REM/ARM
•Error codes stored for diagnostic purposes
•RS232, Ethernet, USB communications interfaces
•RF energy output via MOSFET transistors
•Extensive firmware control of generator – embedded micro-computers
•Procedure-specific modes of operation
•Some generators have pulsed output waveforms
Electrosurgery Generator Technology1926 - Present
5th Generation – Even “Smarter” Advanced Level Generators Are On the
Way!!!
•Leading electrosurgery manufacturers have been experimenting with…
•Higher waveform frequencies•Lower voltages & higher currents•Even more complicated waveforms•Advanced level tissue response technology•Manufacturers that have not yet released generators with pulse output waveforms will be doing so•Closed loop remote communications for diagnosis & calibration via prescribed test technology
Electrosurgery Generator Technology1926 - Present
The ESU Industry Today
Based upon 2006 market research data….
The ESU Industry Today
Based upon 2006 market research data….
ESU Test Technology History
Here’s Where It All Started…
A simple incandescent light bulb was actually the very first ESU “Analyzer” to be used. Some major ESU manufacturers still use light bulbs for certain types of go / no-go output tests as well as
“tissue response” test loads due to the filament impedance change characteristics to applied high frequency energy.
ESU Test Technology History
ESU Test Technology History
1st Generation Devices
• Late 1970’s through early 1990’s (BC Biomedical ESU-2000A is still available)
• “Passive” RF thermocouple ammeter devices
• RF current measurement with RF power (watts) separate scales on meter movements
• Analog meter movements were very susceptible to damage and breakage
• Limited test loads (typically 100, 200, 300, 400, 500 )
• Limited accuracy and functionality
ESU Test Technology History
RF Current Measurement in its simplest form…
ESU Test Technology History2nd Generation Devices
• Mid 1980’s through early 1990’s• Major technology advances from 1st
generation devices• “Active” signal processing of the RF
waveform• RF voltage measurement typically via
resistive voltage divider circuitry• RF current & RF power are calculated
values (I=V/R, P=V2/R)• Thermal converters were typically used
to derive energy readings• Early units had analog meters – later
units had digital displays• Larger variety of test loads than 1st
generation devices• Better accuracy than 1st generation
devices• REM/ARM testing capabilities + Crest
Factor (CF)• Enhanced overall functionality and
reliability
ESU Test Technology HistoryFrom this….
1st Generation…
2nd Generation…
To this…
Typical 2nd Generation Technology…
ESU Test Technology History
Typical 2nd Generation Technology…
ESU Test Technology History
Typical 2nd Generation Technology…
ESU Test Technology History
Typical 2nd Generation Technology…
ESU Test Technology History
Typical 2nd Generation Technology…
ESU Test Technology History
RF Voltage Measurement… typical resistive voltage divider technique…
ESU Test Technology History
ESU Test Technology History
3rd Generation Device – 454A
• The “Industry Icon” Model 454A was the only 3rd Generation design product brought to market
• Product life: 1994 to 2007• “Active” signal processing of the RF
waveform• True RF current measurement via
internal toroidal current transformer• A thermal converter was used to
derive energy readings based upon measured RMS current (P=I2R)
• Largest variety of test loads offered to date by any analyzer (50-1550 )
• Better accuracy than 1st & 2nd generation devices – but still limited compared to 5th generation devices
• Dedicated REM/ARM testing• Enhanced overall functionality and
reliability compared to prior generation devices
The 454A was in a class of its own!
Discontinued in 2007 by manufacturer
ESU Test Technology History
RF Current Measurement… simple & pure industry standard approach…
ESU Test Technology History
ESU Test Technology History4th Generation Devices
• Mid 1990’s through present• 4th Generation devices represent a “step
backwards” in accuracy and innovation compared to 3rd Generation (Model 454A)
• Limited REM/ARM/CQM testing capabilities…poor resolution
• “Active” signal processing of the RF waveform
• RF energy measurement via voltage measurement (capacitive voltage divider circuitry) – a “shortcut” approach that has several significant technical issues
• Calculation of RF current using Ohm’s Law – ignores inductance of load (Calculations: I=V/R & P=V2/R)
• No significant new functionality introduced vs: 3rd or 4th Generation devices
• Less accurate at lower load values & higher frequency combinations
ESU Test Technology History
Fluke Biomedical RF303RS User Manual – showing voltage measurement technique
ESU Test Technology History
Fluke Biomedical RF303RS User Manual – showing CQM testing using the main test load bank (50-750 in 50 increments)
ESU Test Technology History
RF Voltage Measurement… typical capacitive voltage divider technique…
ESU Test Technology History
ESU Test Technology HistoryNew 5th Generation Devices
• Originally introduced mid 2007– ESU-2400 scheduled for release in 3rd
quarter 2009• “DSP” (Digital Signal Processing)
Technology application introduced to the ESU analyzer industry - digital analysis of the complex RF waveform
• Return to industry standard RF current measurement standard
• High speed digitization of complex RF waveform with up to 32,768 discreet data points
• Capable of accurately measuring even pulsed output waveforms
• High speed digital waveform capture• More measurement parameters &
better accuracy than with all prior generation devices
ESU Test Technology History
RF Current Measurement… simple & pure industry standard approach…
ESU Test Technology History
ESU Test Technology History
6th Generation Devices Are Under Development
• These next generation instruments will eventually…
– Take into consideration the next generation technology yet to be released by major electrosurgery manufacturers
– Much larger test load range• Wider scope• Better resolution• Improved accuracy
– Higher current / higher frequency capabilities
– Advanced level automated testing capabilities
– Never seen before user interface– Closed loop remote testing
capabilities– Revolutionize electrosurgery testing
even more dramatically than the 5th generation devices
ESU Analyzer SummaryAnalyzer Generation
Level
RF Energy Measurement
Technique
RF Current Measurement
Accuracy
Pulsed Waveform
Compatible
Product Availability
Bio-Tek Instruments RF-301 1 RF Current 5% Yes Discontinued
Bio-Tek Instruments RF-302 1 RF Current 5% Yes Discontinued
Neurodyne Dempsey 403A 1 RF Current 5% Yes Discontinued
BC Biomedical ESU-2000A 1 RF Current 3% Yes Current Production
Dynatech Nevada 443 2 Resistive Voltage Divider
+ Thermal Converter
?? No Discontinued
Dynatech Nevada 453A 2 Resistive Voltage Divider
+ Thermal Converter
2.5% 100-2000 ma
10% 50 – 99 ma
5% on Power
No Discontinued
Dynatech Nevada 454A
DNI Nevada 454A
Fluke Biomedical 454A
3 RF Current via Wide Band Current Transformer +
Thermal Converter
5% on Current
10% on Power
No Discontinued
Bio-Tek Instruments RF-303RS
DNI Nevada 402A
Dale Technology DALE3000
Fluke Biomedical RF-303RS
4 Voltage measurement via capacitive voltage divider
circuitry
2.5% on Current
5% on Power
No RF-303RS is Current Production
Metron QA-ES
Fluke Biomedical QA-ES
4 Voltage measurement via capacitive voltage divider
circuitry
2% on Current
Not stated on power or voltage
No Fluke Biomedical QA-ES is Current
Production
BC Biomedical ESU-2300 5 RF Current via Wide Band Current Transformer + DSP
2.5% on Current
4% on Power
No Current Production
BC Biomedical ESU-2050 & 2050P 5 RF Current via Wide Band Current Transformer + DSP
1% of Reading on Current Yes (ESU-2050P) Current Production
BC Biomedical ESU-2400 5 RF Current via Wide Band Current Transformer + DSP
<2% on Current (Preliminary Spec)
Yes 3rd Quarter 2009
Current ESU Analyzer Market Offerings
• Fluke Biomedical– 4th Generation Devices
• QA-ES• RF-303RS
• BC Biomedical– 5th Generation Devices
• ESU-2050• ESU-2050P• ESU-2300• ESU-2400
– 1st Generation Device• ESU-2000A
Fluke Biomedical ESU Analyzers4th Generation Technology
• Fluke Biomedical / Metron QA-ES– Fluke Biomedical’s current “high-
end” cross-branded ESU analyzer– Originally introduced by Metron AS
in Trondheim, Norway in 2002 (manufactured in Norway through late 2007)
– Voltage measurement technology– Capacitive voltage divider circuitry
provides basis for calculations of RF current & power
– Does not digitally analyze the RF waveform as patent-pending DFA® Technology aggressively does)
– 2% accuracy on RMS current (perceived to be measurement circuit accuracy only - unit uses 5% tolerance resistors and calculates RF current based upon voltage measurement)
– Accuracy not stated on power or voltage readings
– Uses 5% tolerance load resistors
Fluke Biomedical / Metron QA-ES
I = V/R P = V2/R
• Fluke Biomedical RF-303RS, DNI Nevada 402A, Dale Technology DALE3000
– Common hardware platform– Cross-branding platform of mid-
range ESU analyzer offerings– Voltage measurement technology– Capacitive voltage divider circuitry
provides basis for calculations of RF current & power
– Internal loads (50 to 750 in 50 steps)
– Cannot add external load resistor values
– 2.5% accuracy on current– 5% accuracy on power– Reduced accuracy at lower test
load values, especially with higher frequency waveforms (per Fluke Biomedical application notes & product update bulletin)
Fluke Biomedical RF-303RS
DNI Nevada 402A
Dale Technology DALE3000
(Discontinued)
(Discontinued)
Fluke Biomedical ESU Analyzers4th Generation Technology
I = V/R P = V2/R
ESU-2050 ESU-2300
First available 5th Generation Technology Instruments
DSP Technology & Unprecedented Precision
The result of an 18+ month collaborative partnership with leading worldwide electrosurgery generator manufacturers.
BC Biomedical ESU Analyzers5th Generation Devices
ESU-2400
• ESU-2050 & ESU-2050P “Calibration Quality” Analyzers
– 1% of Reading basic accuracy– Utilizes industry standard RF current
measurement– Utilizes industry standard Vishay Dale NH-
250 precision non-inductive external load resistors and Pearson Electronics precision wide band current transformers
– Ultra high-speed DSP – digital RF waveform processing
– 100% compatible with pulsed output waveforms from generators by Conmed, Erbe, Synergetics, etc. (ESU-2050P)
– 100% compatible with Covidien Force Triad & Ligasure generators – unique in today’s market
– <2 ma to 7,000 ma RF current range – largest range in today’s industry
– USB & RS232 communication ports– SCPI remote control protocol
BC Biomedical ESU Analyzers
• ESU-2300 “Routine PM” Analyzer
– Utilizes industry standard RF current measurement through internal wide band toroidal current transformer
– Ultra high-speed DSP – digital RF waveform processing – same as ESU-2050
– External add-on load resistor compatibility – you can expand beyond 50 to 750
– Internal precision Pearson Electronics wide band current transformer
– Internal 1% precision non-inductive load resistors– Dedicated REM/ARM/CQM test load 1 to 500 in
1 increments– 2.5% of reading accuracy on RF current– USB & RS232 communication ports
BC Biomedical ESU Analyzers
• ESU-2400 Full-Featured Deluxe ESU Analyzer
– Available 3rd quarter 2009– Utilizes industry standard RF current measurement
through internal wide band toroidal current transformer– Ultra high-speed DSP – digital RF waveform processing
– same as ESU-2050– Internal precision load resistors 1 to 6,400 in 1
increments– Internal precision Pearson Electronics wide band current
transformer– Automated testing scripts, automated power load curves,
REM/ARM/CQM test protocols, closed loop testing capability, etc.
– Tissue response testing capability– < 2% of reading accuracy/error on RF current
(preliminary specification)– USB, RS232, Ethernet communication ports
BC Biomedical ESU Analyzers
5th Generation Analyzers Today
• Widely adopted by leading generator manufacturers– Manufacturing– R&D + Engineering– Field Service– Factory Service– Service Training Schools– Reliability Testing– Factory final test & calibration automation
• Fast-growing end-user customer adoption rate– Routine PM– Calibration verification– Calibration per manufacturer specifications– Customers that attend factory service training and work with 5th
generation devices
One Customer’s ListServ CommentsFrom: Paul DeLisle [[email protected]]Sent: Wednesday, July 23, 2008 7:23 PMSubject: Re: ESU analyzers
Hello, Group:I helped test the BC Group 2050 on Valleylab's ForceTriads...it is *much* more accurate, and has much better information than
any of the other units on the market. In addition, since the loads are external; you can use it on *any* ESU (you just might need to buy another $80 resistor...)
We also have a 454; and I have loved it for years...it's very user-friendly; the programming for test series' is fairly simple, and it does most things well-enough.
However, it's built-in resistor loads are 10% tolerance, not the 1% loads that BC Group supplies. In addition, the 454 will not *calibrate* a Valleylab ForceTriad (but it will do the performance check.)
We happened to luck into a bit of end-of-year funds a couple of years in a row...so we actually have a 454, a 2050, and a Metron (Fluke) QA-ES. I would highly recommend *against* getting the QA-ES!
It's actively user-hostile; and it's only benefits (that it can run automated tests) require building special footswitch simulators for every piece of equipment you own, and then learn their programming language to write the routine. It's no more accurate than any other older ESU tester, and is a pain all the way around. STAY AWAY FROM THE QA-ES!
Trust me, guys and gals...get the 2050. It will do *anything* you want it to...although it does it slightly slower than the 454's automated programs. In addition, your Decade box will have to live right next to it, to do your REM tests (another good point about the 454.) However, if you get the BC Group unit, I can't see you ever needing to buy another ESU Analyzer.
Hope this helps!
Paul DeLisle, CBETBiomedical Engineering Support Specialist Central Texas Veteran's Health Care System
One ESU Manufacturer’s Comments
• “We've been doing this for a long time, some 30+ years, and your ESU-2000 Series Product Overview White Paper hit the nail on the head squarely. RF measurement has been the bane our industry, and, while at a manufacturing level we can reproduce fairly accurate and repeatable results, the bio-med industry usually doesn't follow our methods. While our primary focus is neurosurgical, we cover other disciplines as well. Our ESU’s are basically bipolar, and the Malis generators are the mainstay in virtually any Neuro OR around the world.”
3600 Horizon Drive, Suite 110King of Prussia, PA 19406-4700
One ESU Manufacturer’s Comments
• “As you are aware, the demise of the Fluke 8920A series of meters has left us hunting down surplus stock, usually via eBay. Obviously, this won't last forever. In addition, we wanted to post the instruments used in our IFU and service manuals, but without a steady supply of meters, that is out of the question. Finding your ESU-2050 and 2300 series of meters gave us hope that we may be able to now do this, especially after reading that Valleylab has now standardized on your system.”
3600 Horizon Drive, Suite 110King of Prussia, PA 19406-4700
One ESU Manufacturer’s Comments
• “We look forward to having a good working relationship with what appears to be a company that has given considerable thought to solving one our industry's major problems.“
3600 Horizon Drive, Suite 110King of Prussia, PA 19406-4700
The “Science” of ESU Testing
It’s all about the high-frequency “behavior” of electronic components & circuitry, and proper
measurement techniques………
RF Current Measurement vs: Voltage Measurement
RF Current vs: Voltage Measurement• RF Current measurement is the accepted standard in the
electrosurgery generator manufacturing industry!
• RF Current measurement is more accurate than voltage measurement across the load, no matter if the voltage measurement is based upon a resistive or capacitive divider circuit– Capacitive dividers tend to be even more inaccurate due to
uncontrolled (stray) capacitive leakage at higher frequencies, % tolerance on capacitors, accuracy of matching values in the divider circuitry, etc…
• Voltage measurement instruments will be increasingly inaccurate as the waveform frequency increases, especially at lower load values such as 50 and 100
RF Current Measurement in its simplest form (1st Generation Analyzers)…
RF Current vs: Voltage Measurement
RF Current Measurement as implemented today…
RF Current vs: Voltage Measurement
RF Current Measurement as implemented today…
RF Current vs: Voltage Measurement
RF Voltage Measurement… typical resistive voltage divider technique…
RF Current vs: Voltage Measurement
RF Voltage Measurement… typical capacitive voltage divider technique…
RF Current vs: Voltage Measurement
RF Current vs: Voltage Measurement
“When comparing readings measured with a V2/R device to readings measured with an I2R device, total
measurement difference will likely be larger than 35%, due to different methods of deriving power.”
RF Current vs: Voltage Measurement
Why are the two different methods so far apart in measurement accuracy ?
RF Current vs: Voltage Measurement
Why is current measurement superior to simple voltage measurement?
Remember ZL = R + jωL ?
Where…
ZL = AC impedance of the load at the operating frequency (f)
R = DC resistance of the load
ω = 2πf
L = inductance of the load
RF Current vs: Voltage Measurement
ZL = R + jωL
RF Current measurement takes into consideration, the actual frequency of the RF waveform and it is measured through the actual test load’s AC impedance at the operating frequency of
the applied waveform.
RF Current vs: Voltage Measurement
The AC impedance of the load is part of the resulting RF current measurement…
RF Current vs: Voltage Measurement
ZL = R + jωL
RF voltage measurement across the test load (either directly or via voltage divider circuitry) ignores the operating frequency of the RF waveform being applied to the load and then applies
Ohm’s Law to calculate the RF current through the load, using only the DC resistance value of the load, thus totally
ignoring the AC impedance of the load at the operating frequency of the applied waveform.
RF Current vs: Voltage Measurement
Frequency affects the AC impedance of all resistors (and capacitors) in the measurement circuit… not just the load resistor of the analyzer…
RF Current vs: Voltage Measurement
Frequency affects the AC impedance of all resistors (and capacitors) in the measurement circuit… not just the load resistor of the analyzer…
RF Current vs: Voltage Measurement
RF Current vs: Voltage Measurement
ZL = R + jωLExamples of AC load impedance vs: DC load resistance as a
function of operating waveform frequency:L = 10 μH (typical value)
Frequency DC jωL ZL
500 K Hz 50 31.40 59.04
1 M Hz 50 62.80 80.27
2 M Hz 50 125.60 135.19
4 M Hz 50 251.20 256.13
500 K Hz 300 31.40 301.64
1 M Hz 300 62.80 306.50
2 M Hz 300 125.60 325.40
4 M Hz 300 251.20 391.28
4th Generation ESU Analyzers
Capacitive Voltage
Divider Circuit Measurement
RMS Conversion
Analyzer Reading
5th Generation ESU Analyzers with DSP Technology
Ultra High Speed RMS Calculation “Engine”
DSP Processing
Analyzer Reading
Waveform Data Storage
Bank
5th Generation Analyzers
5th Generation Analyzers have totally unique capabilities over prior generation devices….
5th Generation ESU Analyzers with DSP Technology
100% Compatibility with Pulsed Output Waveforms in generators from Conmed, Erbe, Synergetics, etc.
Courtesy of Conmed Electrosurgery…
5th Generation ESU Analyzers with DSP Technology
100% Compatibility with Pulsed Output Waveforms in generators from Conmed, Erbe, Synergetics, etc.
Courtesy of ERBE USA…
100% Compatibility with Covidien Valleylab Ligasure Vessel Sealing Generator 5.5-amp RF
Current Test
5th Generation ESU Analyzers with DSP Technology
100% Compatibility with Covidien Valleylab Force Triad Generator Calibration
5.5 amp RF current test
5th Generation ESU Analyzers with DSP Technology
100% Compatibility with Covidien Valleylab Force Triad Generator Calibration 0 test
load current adjustment test
5th Generation ESU Analyzers with DSP Technology
5th Generation ESU Analyzers with DSP Technology
5th Generation ESU Analyzers with DSP Technology
5th Generation ESU Analyzers with DSP Technology
5th Generation ESU Analyzers with DSP Technology
5th Generation ESU Analyzers with DSP Technology
5th Generation ESU Analyzers with DSP Technology
Bident Coad Waveform - Pulsed - Single Cycle Zoom
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Bident Coag Waveform - Pulsed and Random - Multiple Cycles
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Zoomed Look at Coag Waveform - Several Cycles
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5th Generation ESU Analyzers with DSP Technology
The ESU-2050 & ESU-2050P are currently being utilized by several major electrosurgery generator manufacturers to…
• Automate their factory production lines
• Provide enhanced accuracy and capability in measurement technology for service, QC, final test, R&D, reliability assurance, etc.
• Help train biomedical students (customers) in generator service and calibration
Need additional or more detailed information?
Need additional or more detailed information?
ESU-2000 Series Product Overview “White Paper”
ESU-2000 Series Competitive Product Comparison
Need additional or more detailed information?
Other Resources Available For Your Use
Electrosurgical Analyzer Primer Document
Available from Fluke Biomedical…
Questions & Comments