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An electrosurgical unit, or ESU, is a medical device that uses high-frequency electrical current during surgery. It can cut tissue, remove tissue, or help control bleeding by coagulating small blood vessels. The unit connects to surgical instruments and may use a patient return electrode depending on the mode. ESUs are used by trained surgical teams in operating rooms, procedure rooms, and some outpatient settings.
read more about electrosurgical unit ...An electrosurgical unit is used to make precise cuts and control bleeding during procedures. Surgeons may use it in open surgery, minimally invasive surgery, dermatology, gynecology, general surgery, and other specialties. Cutting mode helps divide tissue, while coagulation mode helps seal bleeding points. The exact settings and instrument type depend on the procedure and tissue being treated.
Monopolar electrosurgery sends current from the active instrument through the patient to a return electrode. Bipolar electrosurgery passes current between two tips of the instrument, so the current path is more localized. Common modes include cut, coagulation, blend, and desiccation depending on the device. Some systems also support advanced vessel sealing or specialty instruments.
The surgical team selects the correct instrument, settings, and safety setup before activation. In monopolar use, the return electrode is placed on suitable skin so current can return safely to the generator. The active electrode is used only when the surgeon intends to cut or coagulate tissue. Staff monitor for proper grounding, smoke, fire risk, fluid pooling, and accidental activation.
Electrosurgical units can cause burns, electrical injury, smoke exposure, fire, or interference with implanted electronic devices if used incorrectly. Safe use requires proper return-electrode placement, dry positioning, correct power settings, and careful handling of active instruments. Oxygen-rich environments, alcohol-based skin prep, and flammable materials need special attention. Patients with pacemakers, defibrillators, or implanted devices should be assessed before electrosurgery.
The terms are sometimes used casually together, but they are not exactly the same. Electrosurgery passes high-frequency current through tissue, while true cautery uses heat transferred from a heated instrument.
Yes. ESUs can be used for tissue cutting and coagulation, depending on the mode, instrument, and power setting chosen by the surgical team.
In monopolar electrosurgery, the return electrode helps the electrical current leave the patient safely and return to the generator. Poor placement can increase burn risk.
It can interfere with some implanted electronic devices. The care team should review the device type and plan precautions before electrosurgery is used.
21 CFR 878.4400 -- Electrosurgical cutting and coagulation device and accessories. eCFR. https://www.ecfr.gov/current/title-21/chapter-I/subchapter-H/part-878/subpart-E/section-878.4400. Date Accessed June 15, 2026.
Premarket Notification (510(k)) Submissions for Electrosurgical Devices for General Surgery. U.S. Food and Drug Administration. https://www.fda.gov/media/87995/download. Date Accessed June 15, 2026.
Electrosurgery. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK482380/. Date Accessed June 15, 2026.
Electrosurgical units ? how they work and how to use them safely. Community Eye Health (PubMed Central). https://pmc.ncbi.nlm.nih.gov/articles/PMC4579996/. Date Accessed June 15, 2026.
Control of Smoke From Laser/Electric Surgical Procedures. Centers for Disease Control and Prevention / NIOSH. https://www.cdc.gov/niosh/docs/hazardcontrol/hc11.html. Date Accessed June 15, 2026.