The current distribution in the electrodes of electrosurgical instruments during welding of biological tissues
DOI:
https://doi.org/10.15587/1729-4061.2015.43372Keywords:
welding of soft biological tissues, electrosurgical instruments, electrodes, high-frequency current, skin effectAbstract
The analysis of the current density distribution in the electrodes of electrosurgical instruments during welding of soft biological tissues was performed. For that, the solution algorithm was developed, and the elliptic problem that simulates the skin effect in the compact section conductors was solved. Verification of the mathematical model of the current density distribution in a monopolar electrode by comparing with the experimental data during surgical operation of welding the retina to the choroid was carried out. The mathematical model shows that high-frequency current hardly flows in a round electrode and this explains the formation of coagulation rings in practical studies of contact retina welding. This model is a one-dimensional elliptic problem for modeling the skin effect in conductors. By changing the current frequency in the electrodes it is possible to influence the width of the coagulation ring and solve the problem of its optimization since too great width of the ring leads to a more traumatic course of the operation, and too small - does not provide the quality and strength of the weld.
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