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 intended patient return circuit. The familiar term “Bovie” does not identify a single model, waveform or power setting.
Components and Tissue Effects
The handpiece accepts compatible electrode tips; controls commonly distinguish cut and coagulation. Some pencils incorporate smoke evacuation. Follow the actual pencil, electrode, generator and return-electrode instructions.
Electrosurgery uses radiofrequency current to produce tissue heating. Coagulation involves protein denaturation; desiccation involves water loss; rapid vaporization can divide tissue. Frequency, electrode contact, tissue impedance, waveform and duration affect the result. High-frequency operation reduces direct neuromuscular stimulation but does not guarantee that all operative reflexes or implanted-device interactions are eliminated.[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. |
Bench peak-power values from one generator and porcine tissue should not be memorized as universal values for a 30 W setting. Likewise, a dermatologic fulguration study does not establish a preferred method for bladder or vaginal-cuff hemostasis.
Monopolar and Bipolar Selection
Monopolar energy has a remote return electrode; bipolar instruments localize the circuit between their working electrodes. Bipolar use usually avoids a separate return pad and reduces some coupling/implant-interference risks, but still heats patient tissue and can injure adjacent structures. No energy type is automatically safe near ureter, nerves, a flap pedicle or prosthetic components.[2]
During reconstruction, identify the target and structures to preserve. Cold scissors, pressure, clips or sutures may be preferable at fine anastomotic or neurovascular planes. Choose energy for the specific task rather than treating the pencil as the default for every genital, vaginal or urethral incision.
Cardiac Implanted Devices
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/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/settings before leaving the monitored environment.
These principles replace a simplistic ranking of suprapubic versus scrotal/perineal procedures. Other electronic implants require their own manufacturer instructions.
Preventing Burns, Fire and Smoke Exposure
Inspect insulation, connections and the active electrode. Position and maintain the return electrode according to its instructions and the planned current path. Holster an unused pencil rather than leaving it on the patient. For laparoscopic/robotic use, follow exact cannula and accessory compatibility rules; “always use all-metal trocars” is not a universal substitute.[3]
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; its absence to the eye is not evidence of no exposure.[6]
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. These results do not establish equivalent safety for every genital, urethral, vaginal or prosthetic-pocket incision.[7]
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.