title: Consideration of different heating lengths of needles with induction heating and resistance system: A novel design of needle module for thermal ablation.
abstract: Thermal ablation using alternating electromagnetic fields is a promising method to treat tissues including tumors. With this approach, an electromagnetic field is generated around an induction coil, which is supplied with high frequency current from a power source. Any electrically conducting object, which is placed in the electromagnetic field, is then heated due to eddy currents. Basic principles underlying this novel thermotherapy needle system are internal induction and resistance heating. This presents a new design of a standard gauge 18 percutaneous trans-hepatic cholangiography needle module combined with a compact power source. Three needle modules containing coils of different lengths were used to locally heat up different volumes of tissues in in vitro experiments on pig livers. Temperature on the inside surface of the needle was controlled and monitored through a K-type thermocouple. By using this needle module system, no two-section or ferromagnetic nanoparticle-coated needles were required; the system worked well with the SUS-304 stainless-steel needle. Successful results were demonstrated in the in vitro experiments on pig livers with different heating lengths of 10, 20, and 30 mm needles. With low power sources, needles could be heated up to a high temperature. The novel design of the needle module incorporated with a high frequency power source was thus shown to be a promising technology for tissue ablation. Bioelectromagnetics.38:220-226, 2017. © 2016 Wiley Periodicals, Inc.
authors.affiliation: Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan, ROC.
authors.forename: Huy-Tien
authors.initials: HT
authors.lastname: Bui
authors.affiliation: Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan, ROC.
authors.forename: Sheng-Jye
authors.initials: SJ
authors.lastname: Hwang
authors.affiliation: Department of Engineering and Science, National Cheng Kung University, Tainan, Taiwan, ROC.
authors.forename: Huei-Huang
authors.initials: HH
authors.lastname: Lee
authors.affiliation: Department of Safety Health and Environment, Chung Hwa College of Medical Technology, Tainan, Taiwan, ROC.
authors.forename: Durn-Yuan
authors.initials: DY
authors.lastname: Huang
mesh_terms: D000818:Animals; D002758:Cholangiography / Q000295:instrumentation*; D004574:Electromagnetic Fields; D004867:Equipment Design; D006979:Hyperthermia, Induced / Q000295:instrumentation* / Q000379:methods; D008099:Liver / Q000473:pathology; D009339:Needles; D013552:Swine; D013696:Temperature
keywords: SUS-304 stainless steel; hyperthermia; internal induction; non-magnetic material; radiofrequency; resistance heating; thermotherapy