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Hepatic bipolar radio-frequency ablation between separated multiprong electrodes
D Haemmerich1, S T Staelin, S Tungjitkusolmun
1Department of Biomedical Engineering, University of Wisconsin, Madison 53706, USA.
IEEE Transactions on Bio-Medical Engineering
|October 5, 2001
Summary
A novel bipolar radio-frequency (RF) ablation technique using hooked electrodes created significantly larger liver tumor lesions compared to monopolar RF ablation in animal studies.
Area of Science:
- Oncology
- Medical Devices
- Surgical Technology
Background:
- Radio-frequency (RF) ablation is a key treatment for unresectable liver tumors.
- Current limitations include small lesion sizes and high recurrence rates due to incomplete tumor cell kill.
Purpose of the Study:
- To evaluate a new bipolar RF ablation method with hooked electrodes.
- To compare lesion volumes and characteristics against traditional monopolar RF ablation.
Main Methods:
- In vivo experiments were conducted on pigs using monopolar and bipolar RF ablation with a RITA model 30 device.
- Finite-element models (FEMs) simulated temperature and electric field distributions for both methods.
- Temperature was controlled at 95°C with electrodes 2.5 cm apart and rotated 45 degrees.
Main Results:
- Bipolar RF ablation produced significantly larger lesion volumes (12.2 ± 3 cm³) compared to monopolar RF ablation (3.9 ± 1.8 cm³).
- FEM analysis predicted larger lesion volumes for bipolar (18.79 cm³) versus monopolar (7.95 cm³).
- The bipolar method showed reduced dependence on liver tissue properties like blood perfusion.
Conclusions:
- The new bipolar RF ablation method demonstrates potential for creating larger, more effective lesions in liver tumors.
- Independent power control for each probe remains a challenge, potentially affecting lesion uniformity.