The Paton Welding Journal, 2021, №07



2021 №07 (04)

DOI of Article 10.37434/tpwj2021.07.05

2021 №07 (06)

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The Paton Welding Journal, 2021, #7, 24-29 pages

Skin-effect in soft biological tissue and features of tissue heating during automatic bipolar welding

V.G. Solovyov, Yu.M. Lankin and I.Yu. Romanova

E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

Abstract
The skin-effect that occurs in the electric circuit at high-frequency electrosurgery, including electric welding of soft biological tissues (SBT) with electrodes for bipolar welding, is of interest to researchers as a possible source of considerably uneven heating of SBT in automatic welding. Mathematical study of electrical and thermal processes in automatic bipolar welding was performed, taking into account and ignoring the impact of skin-effect at the frequency of 300 kHz. It was determined that in biological tissue the skin-effect causes uneven heating to a smaller degree. The main reasons that influence the unevenness of heating are the presence of sharp ridges on the surface of electrodes that contact the tissue, degree of SBT compression by the electrode clamps, length of SBT compressed between the electrodes, and also duration of the process of SBT heating. 13 Ref., 6 Figures.
Keywords: skin-effect, bipolar electrodes, electric welding of soft tissues, biological tissue, anisotropy of specific conductivity

Received 23.03.2021

References

1. DSTU EN 60601-2-2:2019 (EN 60601-2-2:2009, IDT; IEC 60601-2-2:2009, IDT) Medical electrical products. Pt 2-2. Additional safety requirements and basic performance of high frequency surgical equipment and high frequency surgical accessories [in Russian].
2. Polivanov, K.M. (2015) Theoretical principles of electrical engineering. Pt. 3: Theory of electromagnetic field. Moscow, Energiya [in Russian].
3. Sydorets, V.M., Dubko, A.G. (2015) Distribution of current in electrodes of electrosurgical instruments in welding of biological tissues. Eastern-European J. of Enterprise Technologies, 3, 24-28 [in Ukrainian]. https://doi.org/10.15587/1729-4061.2015.43372
4. Sydorets, V., Dubko, A., Bondarenko, O., Kosenko, R. (2016) Influence of skin effect on current flow through electrodes of electro-surgical instruments and biological tissue. In: Proc. of 15th Biennial Conf. on Electronics and Embedded Systems (BEC-2016, Tallinn, Estonia), 211-214. https://doi.org/10.1109/BEC.2016.7743766
5. Sydorets, V.M., Dubko, A.G. (2015) Peculiarities of analysis of high-frequency current distribution in axisymmetric electrodes for electrosurgical instruments. Elektrotekhnika ta Electroenergetyka, 2, 42-47 [in Russian].
6. Sydorets, V., Lebedev, A., Dubko, A. (2015) Mathematical modeling of the current density distribution in a high-frequency electrosurgery. In: Proc. of 16th Int. Conf. on Computational Problems of Electrical Engineering (CPEE, Lviv, Ukraine), 215-217. https://doi.org/10.1109/CPEE.2015.7333379
7. Dubko, A., Sydorets, V., Bondarenko, O. (2018) Simulation of the temperature distribution with high-frequency electrosurgical heating. In: Proc. of 38th Int. Conf. on Electronics and Nanotechnology (ELNANO - 2018, Kyiv, Ukraine), 394-397. https://doi.org/10.1109/ELNANO.2018.8477555
8. Dubko, A.G., Chvertko, N.A., Lebedev, O.V. et al. (2020) Mathematical models of density distribution of high-frequency current in electrodes with different shapes of transverse cross-section. Biomedychna Inzheneriya i Tekhnologiya, 3, 92-98 [in Ukrainian].
9. Gukhman, A.A. (1973) Introduction to similarity theory. 2nd Ed. Moscow, Vysshaya Shkola [in Russian].
10. Lankin, Yu.M., Solovyov, V.G., Romanova, I.Yu. (2021) Study of change in specific electrical conductivity ob biological tissues as a result of local compression by electrodes in bipolar welding. The Paton Welding J., 1, 35-39. https://doi.org/10.37434/as2021.01.07
11. Pegel, I.V. (2009) Electrodynamics of superhigh frequency: Manual. TPU [in Russian].
12. Shved, O.E. (2008) Substantiation of new surgical method of hemostasis (experimental-clinical study). In: Syn. of Thesis for Cand. of Med. Sci. Degree, Kyiv [in Ukrainian].
13. Bulgakov, O., Petrov, S., Lupandin, V. (2009) Allowing for skin effect in problems of self-induction and mutual induction induced by current flow in conductor with rectangular cross-section. Komponenty i Tekhnologii, 4, 122-125 [in Russian].

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