title: Dual-row needle arrays under an electromagnetic thermotherapy system for bloodless liver resection surgery.
abstract: Electromagnetic thermotherapy has been extensively investigated recently and may become a new surgical modality for a variety of medical applications. It applies a high-frequency alternating magnetic field to heat up magnetic materials inserted within the human body to generate tissue coagulation or cell apoptosis. Using a new procedure with dual-row needle arrays under an electromagnetic thermotherapy system with a feedback temperature control system, this study demonstrates bloodless porcine liver resection, which is challenging using existing methods. In vitro experiments showed that hollowed, stainless-steel needles could be heated up to more than 300 °C within 30 s when centered under the induction coils of the electromagnetic thermotherapy system. In order to generate a wide ablation zone and to prevent the dual-row needle arrays from sticking to the tissue after heating, a constant temperature of 120 °C was applied using a specific treatment protocol. The temperature distribution in the porcine livers was also measured to explore the effective coagulation area. Liver resection was then performed in Lan-Yu pigs. Experimental results showed that seven pigs underwent liver resection without bleeding during surgery and no complications afterward. The dual-row needle arrays combined with the electromagnetic thermotherapy system are thus shown to be promising for bloodless tissue resection.
authors.affiliation: Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan. xaviersty@hotmail.com
authors.forename: Sheng Chieh
authors.initials: SC
authors.lastname: Huang
authors.forename: Yi Yuan
authors.initials: YY
authors.lastname: Chang
authors.forename: Ying Jui
authors.initials: YJ
authors.lastname: Chao
authors.forename: Yan Shen
authors.initials: YS
authors.lastname: Shan
authors.forename: Xi Zhang
authors.initials: XZ
authors.lastname: Lin
authors.forename: Gwo Bin
authors.initials: GB
authors.lastname: Lee
mesh_terms: D000818:Animals; D016063:Blood Loss, Surgical / Q000517:prevention & control*; D004574:Electromagnetic Fields; D004867:Equipment Design; D006498:Hepatectomy / Q000295:instrumentation*; D006979:Hyperthermia, Induced / Q000295:instrumentation*; D008099:Liver / Q000473:pathology / Q000601:surgery*; D008280:Magnetics / Q000295:instrumentation*; D023421:Models, Animal; D009339:Needles; D013552:Swine