A coaxial antenna with miniaturized choke for minimally invasive interstitial heating

• Published in: IEEE transactions on biomedical engineering Vol. 50; no. 1; pp. 82 - 88
• Main Authors: Longo, I., Gentili, G.B., Cerretelli, M., Tosoratti, N.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-01-2003; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antennas; Back; Biological and medical sciences; Biomedical equipment; Chokes; Coaxial components; Computer Simulation; Electric Impedance; Electrocoagulation - instrumentation; Electrocoagulation - methods; Electromagnetic Fields; Electromagnetic heating; Equipment Design; Equipment Failure Analysis; Heating; Hot Temperature - therapeutic use; Inductors; Insertion; Interstitials; Medical sciences; Medical services; Medical treatment; Microwave antennas; Microwaves; Microwaves - therapeutic use; Minimally invasive surgery; Models, Biological; Needles; Neoplasms - therapy; Numerical simulation; Quality Control; Sleeves; miniaturized choke; Interstitial coaxial applicator; microwave coagulative therapy
• ISSN: 0018-9294; 1558-2531
• DOI: 10.1109/TBME.2002.807320

We present a new coaxial antenna for microwave interstitial coagulative therapy, working at 2450 MHz and endowed with a miniaturized sleeve choke in order to reduce back heating effects and make the system response less dependent on the antenna insertion depth into the tissue; the way the choke is implemented makes the overall transversal size minimum and allows small adjustments of the choke section length even during operation. We describe the main technical features of the antenna and show experimental results clearly proving the choke effectiveness. Numerical simulations well agree with experimental data, confirming the suitability of the proposed device for minimally invasive medical applications.