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Interstitial microwave hyperthermia applicators having submillimetre diameters
C F Gottlieb1, M J Hagmann, T M Babij
1Department of Radiation Oncology, University of Miami School of Medicine, FL 33101.
Summary
New microscopic interstitial hyperthermia applicators offer improved access for cancer treatment. These smaller devices provide effective energy deposition, suitable for deep-seated tumors and intraluminal access.
Area of Science:
- Biomedical Engineering
- Medical Physics
- Oncology
Background:
- Interstitial hyperthermia is a cancer treatment modality.
- Existing applicators have limitations in terms of size and catheter compatibility.
- Minimally invasive techniques are crucial for treating deep-seated tumors.
Purpose of the Study:
- To fabricate and characterize novel, miniaturized interstitial hyperthermia applicators.
- To evaluate the energy deposition patterns and clinical applicability of these new devices.
- To compare the performance of new applicators with existing commercial options.
Main Methods:
- Microscopic fabrication techniques were employed to create applicators with diameters of 0.20, 0.33, and 0.58 mm.
- Applicator performance was assessed by measuring specific absorption rate (SAR) patterns in muscle-simulating phantoms.
- Electric field intensity was measured using a miniature implantable isotropic probe (3 mm diameter).
Main Results:
- The new applicators are compatible with smaller catheters (22-30 gauge) compared to commercial devices (≥17 gauge).
- SAR patterns demonstrated similar heating characteristics across new and commercial applicators.
- Durability and power handling capabilities were found to be adequate for clinical use.
Conclusions:
- Submillimetre interstitial hyperthermia applicators have been successfully developed.
- These applicators offer improved access for treating deep-seated, intraluminal, or intravascular tumors.
- The findings support the potential clinical utility of these miniaturized devices in cancer therapy.