Characterization of Ferromagnetic Composite Implants for Tumor Bed Hyperthermia

Area of Science:

• Biomedical Engineering
• Oncology
• Materials Science

Background:

• Hyperthermia therapy (HT) is an established cancer treatment adjunct.
• Effective local tumor heating remains a challenge, dependent on the treatment site.
• Novel methods for targeted thermal delivery are crucial for improving cancer care.

Purpose of the Study:

• To investigate a composite ferromagnetic surgical implant for localized hyperthermia therapy.
• To evaluate the feasibility of heating the implant using external magnetic fields for cancer treatment.
• To assess the potential for both traditional HT and thermal ablation using this implant system.

Main Methods:

• Fabrication of composite ferromagnetic implants by mixing thermoseeds with self-polymerizing plastic.
• Heating of model implants within a custom-designed 35 cm diameter induction coil.
• Application of an external magnetic field at sub-megahertz frequencies (90 kHz, amplitude ≤ 4 kA/m).
• Numerical modeling using the finite element method to simulate electromagnetic and heat transfer phenomena.

Main Results:

• Model implants were successfully manufactured and heated using inductive coupling.
• Temperatures suitable for traditional HT (39-45°C) and thermal ablation (>50°C) were achieved.
• Experimental heating results closely matched numerical simulations.
• The system demonstrated effective local heating within the tumor bed.

Conclusions:

• Composite ferromagnetic implants offer a viable method for localized hyperthermia therapy.
• The described inductive heating technique is effective for delivering therapeutic temperatures.
• This approach holds promise for enhancing cancer treatment efficacy through targeted thermal therapies.