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High-powered gas-cooled microwave ablation: shaft cooling creates an effective stick function without altering the
Erica M Knavel1, J Louis Hinshaw, Meghan G Lubner
1Department of Radiology, University of Wisconsin, E3/311 CSC, 600 Highland Ave, Madison, WI 53792, USA.
AJR. American Journal of Roentgenology
|February 24, 2012
Summary
This study shows that gas-cooled microwave antennas effectively secure themselves in tissue during ablation procedures. The cooling mechanism enhances antenna stability without compromising the ablation
Area of Science:
- Minimally Invasive Therapies
- Biomedical Engineering
- Thermal Ablation Technologies
Background:
- Securing antennas in tissue is crucial for effective thermal ablation.
- Existing methods may have limitations in stability or impact on ablation efficacy.
- Gas-cooled microwave devices offer a novel approach to antenna stabilization.
Purpose of the Study:
- To validate a new gas-cooled microwave device for securing antennas in tissue.
- To assess if shaft cooling affects the intended ablation zone.
- To compare the stability of gas-cooled microwave antennas with other applicators.
Main Methods:
- Extraction force measurements of various applicators (radiofrequency, cryoprobes, microwave antennas) in ex vivo liver.
- In vivo porcine liver ablations using the gas-cooled microwave system.
- Histologic analysis to evaluate tissue damage along the antenna shaft.
Main Results:
- Gas-cooled microwave antennas and secured cryoprobes demonstrated significantly higher extraction forces ex vivo.
- In vivo, secured antennas showed increased extraction force before ablation compared to after.
- No histologic evidence of preserved cells along the antenna shaft, indicating effective thermal damage.
Conclusions:
- Gas cooling effectively secures microwave antennas in tissue.
- The cooling mechanism does not alter ablation shape or reduce thermal damage.
- This technology enhances antenna stability during microwave ablation procedures.
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