Electrosurgery Units (ESU s) and their variants
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1 Electrosurgery Units (ESU s) and their variants Key Points Electrosurgical Units: - typical output frequency of modern ESU s ( khz, but can be up to 5 MHz) higher frequency makes finer cut with less ancillary damage - difference in return circuit of monopolar and bipolar modes - difference in waveforms between Cut, Coag, and blend modes - principle of Return Electrode Monitoring (REM) - fulguration, desiccation, ablation, ligature (fulguration = sparking ESU to ablate tissue) - know what the crest factor is (indicates 'quality' of waveform; higher number = noisier) - Argon beam coagulators - hazards of return electrodes - know the principle of the harmonic scalpel - know where these units are used: - khz & MHz - Ω (REM resistance & impedance of tissue) - W (RF power output for cut & coag modes) - ma (RF leakage) not 60 Hz chassis leakage! - μa & Ω (electrical safety testing) D. J. McMahon rev cewood 'four' essentials of maintenance of ESU s: - REM, power, RF leakage, EST, and of course, document! Electrosurgical Theory - Electrosurgery: application of a high-frequency electrical current to tissue to stop bleeding or to cut tissue. Electrosurgical units are radio frequency (RF) generators: Desiccation: to dry-up (in the sense of removing fluid & blood) Ablation: removal of a layer of tissue Fulguration: use of sparking electrosurgery to remove (ablate) tissue Ligature: tying or binding something tightly; sealing a vessel with ESU Cautery: any application of heat to seal bleeding tissue Coagulation: formation of clot to seal bleeding tissue Hemostasis: the stopping of a flow of blood 9 Typically khz, but may be as high as 5 MHz (plastic surgery) higher frequency finer cut & less ancillary damage
2 The basic idea: ESU s are RF generators Modulation of the RF for electrosurgical uses: ESUs are little radio stations Most usage is either Cut or Coag Typical power range: watts Typical power range: watts
3 Cutting action - 100% duty cycle Coagulation - highest voltage, lowest duty cycle. Higher voltage creates more heat, causing hemostasis. Crest Factor or Peak-to-Average Ratio : Different tissues offer different impedances to RF: newer automatic ESU Crest Factor = V peak V RMS ( eg, for a sine wave, CF = 1.41 pure DC would be 1.0) typical older ESU Crest Factor indicates the quality of a waveform. A high CF indicates a less efficient or noisier waveform. (because of the waveform, coag will have a high value)
4 Basic Monopolar Electrosurgery: Bipolar mode cautery - (typical for neuro) (No need for a return pad) Current flows through insulated forceps Typical power range: 0-70 watts RF Ablation: removal of a layer of tissue by use of localized RF (typical for heart, liver) also called fulguration Safety Issues in ESU s: > External second site RF burns > Internal second site RF burns > RF interference on adjacent devices > Smoke plume > Fire
5 Effective distribution of RF energy to the return pad Tissue is burned where desired, but not on exit Faulty contact of the return pad Tissue is burned where desired, and at the pad. BAD: Alternate Site Burns in a Basic Monopolar System BETTER: The Isolated Electrosurgical System
6 BEST: the Return Electrode Monitoring (REM) system: Typical REM signal is 80 ~10µA Isolated system is deactivated if the return path is opened, but burns can still occur if there is a path to ground. Return pad has two conductive plates, which are monitored by the ESU for continuity. aka Contact Quality Monitoring Internal second site burns during endoscopy:
7 Hazardous practices to be aware of: > Buzzing the hemostat: touching the active electrode to a hemostat (or several hemostats) clamped to tissue in order to save time. Can result in shocks or burns. > Wrapping the active lead wire around metallic instruments. ESUs are the primary source of ignition for O.R. fires. O.R. personnel are expected to take appropriate precautions: - Eliminate the use of alcohol-based prep solutions - Minimize fuel loading (flammable materials on & near the site) - Minimize oxygen flooding around the surgical site. - Have a fire extinguisher within ready access. > Stacking other medical electronics on or under the ESU. RF from the ESU can trigger or alter the function of other equipment.
8 Smoke plume Smoke-evacuation for ESU s: Smoke plume from electrosurgery is just as much a hazard to staff as is plume from lasers. - Gases and particulates are toxic and carcinogenic. OSHA and the AORN both encourage the routine use of smoke evacuators, high-filtration masks, and eye protection when using electrosurgical units. - Compliance has not been universal. older Valleylab current Valleylab Variations on Electrosurgery: Argon Beam Coagulators - Essentially an enhanced ESU - still has cut, coag, bipolar - Use high voltage from the ESU to ionize a stream of Argon gas - Resulting plasma provides a cleaner, wider coagulating effect
9 Conmed s Argon Beam Coagulator model 7500 Variants on the ESU: Valleylab s Ligasure vessel-sealing system Valleylab s Force Argon argon beam coagulator used with their Force-FX
10 Proprietary Variants on Electrosurgery Arthrocare Corp: Coblator II for ENT surgery > Specific to a surgical procedure > Often use a higher frequency > 500kHz > Usually a surgeon s preference > Usually use a unique disposable Elmed 50-P: for Gynecological surgery Medtronic Corp: Cardioblate for ablation of heart tissue
11 Hologic Corp: NovaSure for thermal ablation of the uterus Somnus: Somnoplasty (for snoring) Hyfrecator output modes: Conmed s Hyfrecator - Low energy cautery, without a grounding pad - Often used in clinics, for smaller lesions Bipolar mode Monopolar with return pad Monopolar without pad
12 Variants on the ESU: The Harmonic Scalpel (Ethicon / Johnson & Johnson) -- NOT an electrosurgical unit -- Uses piezoelectric component to create an axial vibration (at ~56 KHz) at the surgical tip -- Use a variety of surgical probes and extensions specific to the surgical procedure -- Technically elegant; calibration pretty simple Testing ESU s: Generic ESU tester > Derives a small DC voltage from the RF from the ESU > DC value is proportional to the output power (usually 500 Ω) Functional Check: 1) Return Electrode Monitor (Ω) - Measure the resistance from the REM connector to ground: should be >20M Ω. - For single conductor return electrodes, verify that the unit alarms and does not deliver power if the resistance across the REM leads is >10 Ω. - For split pad return electrodes, verify that the unit alarms and does not deliver power if the resistance across the REM leads is < 5 Ω or >150 Ω. (Depends on the model - check the manual!) Functional Check: 2) RF Power Output (W) - Use your analyzer or external non-inductive resistors as appropriate load impedances for Bipolar, Cut and Coag modes, (typically 100Ω, 300Ω, and 500Ω, resistive). - Test the unit in the Cut, Coag, and Bipolar modes, at a low power and at maximum power. - 5 watts for the low end - maximums typically 300W for Cut, 120W for Coag 70W for Bipolar - Power readings should be ±5W or ±15%
13 Functional Check: 3) RF Leakage (ma) (not 60 Hz current) - Configure the analyzer for RF Leakage - For any monopolar output, with appropriate load, RF leakage should be < 100mA (not µa!) - For the bipolar output, RF leakage should be < 60 ma. Thorough testing an ESU includes power output tests at a variety of load impedances, in order to simulate the variable loads in the different types of tissue encountered by the active electrode during surgery. Current ESU analyzers enable the user to test in each mode and power setting at several impedances sequentially. (Check the manual - some models allow 150mA) Functional Check: 4) Electrical Safety Check (Ω & μa) ESU Test Equipment - - per your department protocol and finally, Document! - the ESU control number is entered in the surgical record by nursing staff for each surgery. If there is any sentinel event, your maintenance record can be used in a legal action. Fluke 454A (legacy)
14 ESU Test Equipment - ESU Test Equipment - BC Group s ESU-2300 Test setup with load resistors Fluke QA-ES Typical Troubleshooting - - Surgeons complain about poor output - Active lead wires increase resistance with age - Foot pedals fail from abuse - ESU signals cause interference on video displays - REM pad connectors break and become intermittent Major Players in: General Electrosurgery: - Valleylab - Conmed - Erbe Argon Beam Coags: - Valleylab - Conmed Harmonic Scalpels: - Ethicon - Olympus
15 More information: Non-Valleylab ESU service website: Valleylab tech reference site: Nice history of electrosurgery: Very nice review of electrosurgery principles, safety issues, and surgical video:
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