Moll, XavierFondevila, DolorsGarcía Arnas, FélixBurdío Pinilla, FernandoTrujillo Guillén, MacarenaIrastorza, Ramiro M.Berjano, Enrique J.Andaluz, Anna2023-04-122023-04-122022Moll X, Fondevila D, García-Arnas F, Burdio F, Trujillo M, Irastorza RM, Berjano E, Andaluz A. Comparison of two radiofrequency-based hemostatic devices: Saline-linked bipolar vs. cooled-electrode monopolar. Int J Hyperthermia. 2022;39(1):1397-407. DOI: 10.1080/02656736.2022.21408400265-6736http://hdl.handle.net/10230/56446Purpose: To characterize the coagulation zones created by two radiofrequency (RF)-based hemostatic devices: one comprised an internally cooled monopolar electrode and the other comprised externally irrigated bipolar electrodes (saline-linked). Materials and methods: RF-induced coagulation zones were created on ex vivo and in vivo porcine models. Computer modeling was used to determine the RF power distribution in the saline-linked device. Results: Both external (irrigation) and internal cooling effectively prevented tissue sticking. Under ex vivo conditions in 'painting' application mode, coagulation depth increased with the applied power: 2.8 - 5.6 mm with the 3-mm monopolar electrode, 1.6 - 6.0 mm with the 5-mm monopolar electrode and 0.6 - 3.2 mm with the saline-linked bipolar electrodes. Under in vivo conditions and using spot applications, the 3-mm monopolar electrode created coagulation zones of similar depth to the saline-linked bipolar electrodes (around 3 mm), while the 5-mm monopolar electrode created deeper coagulations (4.5 - 6 mm) with less incidence of popping. The presence of saline around the saline-linked bipolar electrodes meant that a significant percentage of RF power (50 - 80%) was dissipated by heating in the saline layer. Coagulation zones were histologically similar for all the tested devices. Conclusions: Both external (irrigation) and internal cooling in hemostatic RF devices effectively prevent tissue sticking and create similar coagulation zones from a histological point of view. Overall, saline-linked bipolar electrodes tend to create shallower coagulations than those created with an internally cooled monopolar electrode.application/pdfeng© 2022 The Author(s). Published with license by Taylor & Francis Group, LLC. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.info:eu-repo/semantics/articlehttp://dx.doi.org/10.1080/02656736.2022.2140840Cooled electrodeHemostatic deviceRadiofrequencySaline-linkedThermal ablationinfo:eu-repo/semantics/openAccess