The effects of the no-touch gap on the no-touch bipolar radiofrequency ablation treatment of liver cancer: A numerical study using a two compartment model

Yap, Shelley; Cheong, Jason K. K.; Foo, Ji Jinn; Ooi, Ean Tat; Ooi, Ean Hin

doi:10.1016/j.apm.2019.10.021

Cited by 7 publications

(3 citation statements)

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“…Four identical single‐shaft bipolar cooled needles were inserted in parallel into the tissue at a distance of 5 mm from the tumour in a grid such as shown in Figure 1E. The 5 mm gap was recently shown to be the best choice for the implementation of no‐touch bRFA 6 . Each bipolar needle was modelled after the commercial bipolar applicator CELON ProSurge, which has a radius of 0.9 mm and two electrically conductive sections of length 13.5 mm that were separated by an electrically insulated segment of length 3 mm.…”

Section: Methodsmentioning

confidence: 99%

“…There has been a surge in popularity in the use of bipolar radiofrequency ablation (bRFA) for treating liver cancer, as evident by the number of research studies that have been published over the past 5 years 1‐6 . Bipolar radiofrequency ablation differs from monopolar RFA (mRFA), in that the technique does not make use of grounding pads in order to complete the electrical circuit.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, four bipolar needles with six different electrode configurations (see Section 2.2) will be considered. Although using two needles will yield the least number of possible configurations, it has been shown to be incapable of completely ablating the tumour domain 6 …”

Section: Introductionmentioning

confidence: 99%

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Thermal and thermal damage responses during switching bipolar radiofrequency ablation employing bipolar needles: A computational study on the effects of different electrode configuration, input voltage and ablation duration

Cheong

Ooi

2020

Numer Methods Biomed Eng

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Recent studies have demonstrated the effectiveness of switching bipolar radiofrequency ablation (bRFA) in treating liver cancer. Nevertheless, the clinical use of the treatment remains less common than conventional monopolar RFA – likely due to the lack of understanding of how the tissues respond thermally to the switching effect. The problem is exacerbated by the numerous possible switching combinations when bRFA is performed using bipolar needles, thus making theoretical deduction and experimental studies difficult. This article addresses this issue via computational modelling by examining if significant variation in the treatment outcome exists amongst six different electrode configurations defined by the X‐, C‐, U‐, N‐, Z‐ and O‐models. Results indicated that the tissue thermal and thermal damage responses varied depending on the electrode configuration and the operating conditions (input voltage and ablation duration). For a spherical tumour, 30 mm in diameter, complete ablation could not be attained in all configurations with 70 V input voltage and 5 minutes ablation duration. Increasing the input voltage to 90 V enlarged the coagulation zone in the X‐model only. With the other configurations, extending the ablation duration to 10 minutes was found to be the better at enlarging the coagulation zone.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%