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Bipolar radiofrequency: what the term means
Medically reviewed by Dr Sin Yong · Last reviewed · 4 min read
Published 10 October 2026 · Reviewed by Dr Sin Yong
Bipolar radiofrequency is a way of delivering radiofrequency energy in which the current flows between two electrodes that sit in the same handpiece or needle tip. Because the current only travels between those electrodes, the heat stays in a defined zone close to the surface or around the needle tips. Most RF microneedling devices, including Secret RF, are bipolar.
Key facts
How it works
Current flows between two electrodes in the same tip
Heat
Confined to the tissue between the electrodes
Contrast
Monopolar RF sends current to a return pad elsewhere on the body, heating more broadly and deeply
Monopolar current travels to a distant return pad; bipolar current stays between two electrodes in one tip. Schematic, not to scale.
Bipolar and monopolar: why the difference matters
With bipolar delivery, the doctor controls where the heat lands by choosing the needle depth and the spacing of the electrodes; the energy does not travel far beyond them (Chandra, J Cutan Aesthet Surg 2024). Monopolar devices such as Thermage FLX and Volnewmer send the current from the treatment tip to a return pad on the body, which heats a broader volume of tissue and is used for tightening rather than for working at a set needle depth. See monopolar radiofrequency.
Frequency changes the picture too: at 2 MHz the heat tends to stay closer to the needle, while lower frequencies spread it further. The device-by-device figures, taken from each manufacturer's US FDA filing, are on RF microneedling devices compared.
Frequently Asked Questions
Most RF microneedling devices are bipolar. A few, such as Potenza, offer both modes in different tips (FDA K192545).
Neither is safer in itself. They heat tissue in different patterns and suit different problems; settings, skin type and the doctor's assessment matter more than the mode.
References
Chandra S, et al. Physics of fractional microneedle radiofrequency. J Cutan Aesthet Surg. 2024;17:177. doi:10.25259/jcas_98_23 (PMID 39483649). source
Kumar N, et al. Fractional microneedle radiofrequency: a systematic review of 41 studies with device-level tables. Aesthetic Plast Surg. 2026. doi:10.1007/s00266-026-05834-y (PMID 42047762). source
US FDA 510(k) summary K170325 — Secret RF (ILOODA Co., Ltd.), 2017: bipolar 2 MHz, needle depth 0.5–3.5 mm in 0.1 mm steps. source
US FDA 510(k) summary K192545 — Potenza (Jeisys Medical Inc.), 2020: monopolar and bipolar RF at 1 and 2 MHz. source
