Electrosurgical Pencil ("Bovie")

A monopolar electrosurgical pencil delivers high-frequency current through an active electrode to cut or coagulate tissue. The current returns to the generator through the patient return electrode. The familiar term "Bovie" does not identify a single model, waveform or power setting. The pencil is the standard handheld energy device for skin and fascial incision, subcutaneous and deep dissection, and hemostasis of small vessels in open reconstructive urology and urogynecology.

Components and Tissue Effects

• Active electrode. Interchangeable blade, needle or ball tips seat in the handpiece collet.
• Handpiece. Two finger buttons commonly separate cut and coagulation (yellow and blue on many models). Some pencils incorporate a smoke-evacuation collar.
• Circuit. Current flows from the active tip through the patient to a dispersive return pad on the thigh or back and closes at the generator.
• Generator settings. Power, waveform (cut, blend, coagulation) and, on some units, pulsed, fulguration or spray modes. Follow the actual pencil, electrode, generator and return-electrode instructions.

The electrosurgical unit raises wall current from 60 Hz to more than 500,000 Hz, which heats tissue without neuromuscular stimulation.^[1] Heat is generated where tissue resistance converts current to heat next to the active electrode. Heating below the boiling point denatures protein (coagulation), slower further heating drives off water (desiccation), and a sudden rise above the boiling point vaporizes intracellular water and fragments tissue (cutting).^[9] Frequency, electrode contact, tissue impedance, waveform and duration all affect the result.^[1]

Mode/technique	General concept	Why a simple ranking is misleading
Cut	Often a continuous lower-voltage waveform producing rapid division	Can still cause lateral heat, arcing or unintended energy transfer.
Coagulation	Several modes with different voltage, duty cycle and feedback	“Coag” does not mean one waveform, a validated vessel seal or invariably the deepest injury.
Blend	Modifies cutting characteristics and hemostasis	Named modes are generator-specific; equal displayed watts do not imply equal tissue effects.
Contact desiccation/coagulation	Current passes through contacted tissue with heating and water loss	Depth varies with technique and tissue; desiccation is not simply slow heating above boiling.
Fulguration	High-voltage arcing across a gap in an approved application	Often used for surface treatment, but is not guaranteed superficial and is not permitted for every electrode/platform.

In a pig colon model on one generator at a nominal 30 W setting, the peak power was about 90 W for pure cut, 228 W for blend and 1,154 W for coagulation. Coagulation current caused deeper injury than blend current (p = 0.016); its difference from pure cut did not remain significant after correction for multiple comparisons.^[10] Peak power differs between generators.

Electrosurgical techniques

Technique	Tip-to-tissue	Usual use
Electrosection (cutting)	Contact	Tissue division with limited hemostasis
Electrocoagulation	Contact	Sealing small vessels
Electrodesiccation	Contact	Deeper destruction, rarely the goal in reconstruction
Electrofulguration	Slightly off the tissue, arcing	Superficial coagulation of oozing surfaces

In an in vitro bovine-liver study, fulguration produced only superficial coagulation, whereas contact coagulation with the flat of the electrode was deeper and slower electrode movement in contact mode (desiccation) was deepest.^[11] Fulguration is commonly used for oozing raw surfaces such as bladder mucosa (through an endoscopic electrode) and the vaginal cuff. That use rests on practice rather than on a comparative study of bladder or cuff hemostasis, and it is not permitted for every electrode or platform.

Monopolar and Bipolar Selection

Feature	Monopolar (pencil)	Bipolar
Circuit	Active tip and remote dispersive pad	Both electrodes at the forceps tips
Current path	Through the patient between electrode and pad	Localized between the tips
Usual use	General cutting and dissection	Fine hemostasis near nerves, vessels and implants, and in patients with cardiac devices
Risks	Pad burns, capacitive coupling, insulation failure, electromagnetic interference	Fewer stray-current pathways, but still heats adjacent tissue

Bipolar use avoids a separate return pad and reduces some coupling risks, and bipolar electrosurgery does not cause electromagnetic interference with a cardiac implantable electronic device unless it is applied directly to the device.^[2] It still heats patient tissue and can injure the ureter, nerves, a flap pedicle or prosthetic components next to the jaws. For peri-urethral, peri-corporal, peri-vasal and peri-neural work, a Gerald bipolar is the usual alternative.

During reconstruction, identify the target and the structures to preserve. Cold scissors, pressure, clips or sutures may be preferable at fine anastomotic or neurovascular planes.

Common uses

• Skin and fascial incision. Midline, Pfannenstiel, Gibson and perineal incisions, scrotal and inguinal incisions, and vaginal incisions for prolapse, fistula or cuff approaches.
• Subcutaneous and deep dissection. Through Camper and Scarpa fascia, into the rectus sheath and the preperitoneal space.
• Hemostasis of small vessels. Scarpa-layer, fascial-edge and subcutaneous bleeders where lateral spread does not threaten a structure to be preserved.
• Cystotomy and partial cystectomy. When bladder wall is incised in pure cut mode, do not assume that lateral heat stays clear of the trigone, ureteric orifices or bladder neck.^[10]
• Mesh. Minimize cautery contact with polypropylene mesh to avoid melting and shedding.

Where to switch off the pencil

• Near the ureter. Thermal injury can present late as stricture or fistula. Use scissors, traction and sharp dissection, or bipolar energy.
• Near the penile neurovascular bundle, dorsal nerve, pudendal nerve or obturator nerve. Use sharp dissection or bipolar energy.
• Inside an implant field. Cautery near a cylinder, pump, reservoir or cuff can damage the device. Minimize its use and prefer bipolar energy.
• At a vasal or other microsurgical anastomosis. Use low-power bipolar energy.

Cardiac Implanted Devices

Monopolar electrosurgery is the main surgical source of electromagnetic interference with pacemakers and defibrillators. Interference on the ventricular channel can inhibit pacing, and on the atrial channel it can trigger rapid ventricular pacing.^[15] The AHA's 2024 statement recommends a coordinated plan based on the device, pacing dependence, procedure and expected electromagnetic interference.^[2]

• Prefer true bipolar electrosurgery when suitable; keep monopolar bursts brief, generally no more than 5 seconds.
• Direct the current path away from the generator and leads. Surgery below the umbilicus is lower risk when the return electrode is also below it, but an abdominal generator or an underbody or whole-body return electrode can change that assessment.
• Establish the device-specific magnet response or reprogramming plan. An ICD magnet generally suspends tachyarrhythmia treatment; it does not make its pacing asynchronous.
• Ensure monitoring, rescue capability and restoration of altered device therapies and settings before leaving the monitored environment.

These principles replace a simplistic ranking of suprapubic versus scrotal or perineal procedures. Other electronic implants require their own manufacturer instructions.

Preventing Burns, Fire and Smoke Exposure

Inspect insulation, connections and the active electrode. Verify that the accessory's rated peak voltage accommodates the selected generator mode; a fitting plug alone is insufficient. Position and maintain the return electrode according to its instructions and the planned current path. Holster an unused pencil, and do not leave it on the patient. For laparoscopic or robotic use, follow exact cannula and accessory compatibility rules; all-metal trocars alone may not satisfy them.^[3][8]

Return-electrode monitoring is system- and pad-dependent. In the Erbe VIO 3 manual, a compatible split pad permits monitoring of connection, skin contact and application direction; a non-split pad permits monitoring of connection only, so no contact-loss alarm should be assumed. Follow the actual pad and generator instructions and recheck contact after repositioning or prolonged activation; do not answer an unexplained loss of effect merely by increasing power.^[8]

Avoid unintended tissue or metal contact, prolonged open-air activation and using one energized instrument to energize another. Experimental robotic work demonstrates coupling to otherwise nonelectrical instruments; reducing power and using a suitable lower-voltage mode can reduce, but not eliminate, that hazard.^[4]

Prevent the combination of an ignition source, fuel and oxidizer. Allow the skin preparation to dry completely according to its label, prevent pooling and remove wet materials; a fixed three-minute timer does not cover every formulation, hair-bearing area or pooled preparation. Coordinate oxygen delivery and ignition timing with anesthesia, and store the pencil safely.^[3][5]

Use effective smoke evacuation at the source. A minimally visible plume can still contain hazardous particles and chemicals.^[6]

Reported Injuries

An analysis of the FDA MAUDE database (1994 to 2013) identified 178 deaths and 3,553 injuries related to surgical energy devices. Thermal burns accounted for 63% of events (direct application 30% and dispersive-electrode burns 29% of burns; insulation failure 14%), hemorrhage 17%, mechanical device failure 12% and fire 8%. Among fires, 88% involved monopolar "Bovie" instruments and 66% occurred in head and neck operations. Direct-application injury was the most common mechanism of death.^[12]

In a national survey of otolaryngologists (296 respondents, 99,664 cases in one year), 324 electrosurgical complications were reported: 219 unanticipated direct burns, 48 capacitive-coupling burns, 13 grounding-pad burns, 11 fires and 32 cases of electromagnetic interference.^[14] These are self-reported figures from a survey with a 50% response rate.

• Direct-application burns. Holster the pencil when not in use and never lay it on the patient.
• Dispersive-pad burns. Place the pad over a well-vascularized muscle bed with full skin contact, away from bony prominences, scar, hair and metal implants.
• Capacitive coupling during laparoscopy. Current can pass through intact insulation to an adjacent conductive instrument. In an ex vivo study, coupling energy was lower with lower power (1.1 J at 25 W versus 2.4 J at 50 W), with cut mode than with coagulation mode, and with desiccation than with open-air activation or fulguration.^[13]
• Insulation failure. Inspect laparoscopic shafts before use and replace damaged instruments.

Electrosurgery Versus Scalpel for Abdominal Incision

The 2017 Cochrane review included 16 trials and 2,769 participants. It found no clear infection difference (low certainty), very uncertain dehiscence evidence and no reported time-to-healing data. Average reductions of approximately 46 seconds in incision time and 20 mL in blood loss were not considered clinically important. The 2017 Cochrane review did not assess genital, urethral, vaginal or prosthetic-pocket incisions.^[7]

Historical Context

The device is named for William T. Bovie, who developed the electrosurgical unit. Harvey Cushing first used it clinically at Peter Bent Brigham Hospital on October 1, 1926, to remove a vascular tumor of the skull that had bled uncontrollably at an earlier attempt. Their collaboration greatly reduced intraoperative blood loss and let Cushing operate on tumors previously judged inoperable.^[16][17][18]

See also: Bovie Tips, Gerald Bipolar, Energy Devices.

References

1. Vilos GA, Rajakumar C. Electrosurgical generators and monopolar and bipolar electrosurgery. J Minim Invasive Gynecol. 2013;20:279–287. doi:10.1016/j.jmig.2013.02.013.

2. American Heart Association. Periprocedural management and multidisciplinary care pathways for patients with cardiac implantable electronic devices. Circulation. 2024. doi:10.1161/CIR.0000000000001264. Full text.

3. US FDA. Practical Advice for Preventing Surgical Fires: safety strategies from the front lines. FDA webinar slides.

4. Overbey DM, Carmichael H, Wikiel KJ, et al. Monopolar stray energy in robotic surgery. Surg Endosc. 2021. doi:10.1007/s00464-020-07605-5.

5. US FDA. Alcohol-containing skin-preparation labeling review: drying, hair and pooling precautions. NDA 208288 labeling review.

6. CDC/NIOSH. Surgical smoke inhalation: dangerous consequences for the surgical team. NIOSH-hosted safety discussion.

7. Charoenkwan K, Iheozor-Ejiofor Z, Rerkasem K, Matovinovic E. Scalpel versus electrosurgery for major abdominal incisions. Cochrane Database Syst Rev. 2017;CD005987. doi:10.1002/14651858.CD005987.pub3.

8. Erbe Elektromedizin. VIO 3 User Manual, document 80115-501_V26386, December 2025, pp. 21–26, 31–35, 39–44 (active accessory compatibility, return-pad use and monitoring). Manufacturer manual.

9. Taheri A, Mansoori P, Sandoval LF, et al. Electrosurgery: part I. Basics and principles. J Am Acad Dermatol. 2014;70(4):591.e1-591.e14. doi:10.1016/j.jaad.2013.09.056.

10. Chino A, Karasawa T, Uragami N, et al. A comparison of depth of tissue injury caused by different modes of electrosurgical current in a pig colon model. Gastrointest Endosc. 2004;59(3):374-379. doi:10.1016/s0016-5107(03)02712-3.

11. Taheri A, Green C, Mansoori P. Controlling depth of electrosurgery after curettage of skin tumors: an in vitro study. Int J Dermatol. 2019;58(12):1472-1476. doi:10.1111/ijd.14631.

12. Overbey DM, Townsend NT, Chapman BC, et al. Surgical energy-based device injuries and fatalities reported to the Food and Drug Administration. J Am Coll Surg. 2015;221(1):197-205.e1. doi:10.1016/j.jamcollsurg.2015.03.031.

13. Robinson TN, Pavlovsky KR, Looney H, Stiegmann GV, McGreevy FT. Surgeon-controlled factors that reduce monopolar electrosurgery capacitive coupling during laparoscopy. Surg Laparosc Endosc Percutan Tech. 2010;20(5):317-320. doi:10.1097/SLE.0b013e3181f3f867.

14. Smith TL, Smith JM. Electrosurgery in otolaryngology-head and neck surgery: principles, advances, and complications. Laryngoscope. 2001;111(5):769-780. doi:10.1097/00005537-200105000-00004.

15. Mulpuru SK, Madhavan M, McLeod CJ, Cha YM, Friedman PA. Cardiac pacemakers: function, troubleshooting, and management: part 1 of a 2-part series. J Am Coll Cardiol. 2017;69(2):189-210. doi:10.1016/j.jacc.2016.10.061.

16. Voorhees JR, Cohen-Gadol AA, Laws ER, Spencer DD. Battling blood loss in neurosurgery: Harvey Cushing's embrace of electrosurgery. J Neurosurg. 2005;102(4):745-752. doi:10.3171/jns.2005.102.4.0745.

17. Carter PL. The life and legacy of William T. Bovie. Am J Surg. 2013;205(5):488-491. doi:10.1016/j.amjsurg.2012.12.005.

18. O'Connor JL, Bloom DA. William T. Bovie and electrosurgery. Surgery. 1996;119(4):390-396. doi:10.1016/s0039-6060(96)80137-1.