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Electromagnetic effects on the biological tissue surrounding a transcutaneous transformer for an artificial anal sphincter system

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2010年第12期11卷 931-936页

作者： Peng ZAN Bang-hua YANG Yong SHAO Guo-zheng YAN Hua LIU Shanghai Key Laboratory of Power Station Automation Technology College of Meehatronics Engineering and Automation Shanghai University Shanghai 200072 China School of Electronics Information and Electrical Engineering Shanghai Jiao Tong University Shanghai 200240 China

This paper reports on the electromagnetic effects on the biological tissue surrounding a transcutaneous transformer for an artificial anal *** coupling coils and human tissues,including the skin,fat,muscle,liver,and blood,were *** absorption rate (SAR) and current density were analyzed by a finite-length solenoid ***,SAR and current density as a function of frequency (10–107 Hz) for an emission current of 1.5 A were calculated under different tissue *** relations between SAR,current density,and five types of tissues under each frequency were *** a result,both the SAR and current density were below the basic restrictions of the International Commission on Non-Ionizing Radiation Protection (ICNIRP).The results show that the analysis of these data is very important for developing the artificial anal sphincter system.

关键词： Artificial anal sphincter Transcutaneous energy transmission Current density specific absorption rate

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Investigation of artifacts by mapping SAR in thermoacoustic imaging

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Journal of Innovative Optical Health Sciences 2021年第5期4卷 75-84页

作者： Xiao Liang Qiang Liu Zezhou Sun Weizhi Qi Yubin Gong Lei Xi School of Physics University of Electronic Science and Technology of China ChengduSichuan 610054P.R.China Department of Biomedical Engineering Southern University of Science and Technology ShenzhenGuangdong 518055P.R.China School of Electrical Science and Engineering University of Electronic Science and Technology of China ChengduSichuan 610054P.R.China

Microwave-induced thermoacoustic imaging(MI-TAI)remains one of the focus of attention among biomedical imaging modalities over the last ***,the transmission and dis-tribution of microwave inside bio-tissues are complicated,thus result in severe *** this study,to reveal the underlying mechanisms of artifacts,we deeply investigate the distribution of specific absorption rate(SAR)inside tissue-mimicking phantoms with varied morphological features using both mathematical simulations and corresponding *** simulated results,which are confirmed by the associated experimental results,show that the SAR distri-bution highly depends on the geometries of the imaging targets and the polarizing features of the *** addition,we propose the potential mechanisms including Mie-scattering,Fabry-Perot-feature,small curvature effect to interpret the diffraction effect in different scenarios,which may provide basic guidance to predict and distinguish the artifacts for TAI in both fundamental and clinical studies.

关键词： Imaging microwave thermoacoustic imaging artifacts specific absorption rate

Epidermal radio frequency electronics for wireless power transfer

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Microsystems & Nanoengineering 2016年第1期2卷 52-60页

作者： Xian Huang Yuhao Liu Gil Woo Kong Jung Hun Seo Yinji Ma Kyung-In Jang Jonathan A.Fan Shimin Mao Qiwen Chen Daizhen Li Hank Liu Chuxuan Wang Dwipayan Patnaik Limei Tian Giovanni A.Salvatore Xue Feng Zhenqiang Ma Yonggang Huang John A.Rogers Department of Biomedical Engineering School of Precision Instrument and Opto-electronics EngineeringTianjin UniversityTianjin 300072China Department of Materials Science and Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Department of Electrical and Computer Engineering University of Wisconsin-MadisonMadisonWI 53706USA Department of Civil and Environmental Engineering Northwestern UniversityEvanstonIL 60208USA Department of Engineering Mechanics Center for Mechanics and MaterialsTsinghua UniversityBeijing 100084China Department of Mechanical Engineering Northwestern UniversityEvanstonIL 60208USA Department of Robotics Engineering Daegu Gyeongbuk Institute of Science and TechnologyDaegu 42988Republic of Korea Department of Electrical Engineering Stanford UniversityStanfordCA 94305USA

Epidermal electronic systems feature physical properties that approximate those of the skin,to enable intimate,long-lived skin interfaces for physiological measurements,human–machine interfaces and other applications that cannot be addressed by wearable hardware that is commercially available today.A primary challenge is power supply;the physical bulk,large mass and high mechanical modulus associated with conventional battery technologies can hinder efforts to achieve epidermal characteristics,and near-field power transfer schemes offer only a limited operating *** we introduce an epidermal,farfield radio frequency(RF)power harvester built using a modularized collection of ultrathin antennas,rectifiers and voltage *** components,separately fabricated and tested,can be integrated together via methods involving soft contact *** studies of the individual components and the overall performance in various dielectric environments highlight the key operational features of these systems and strategies for their *** results suggest robust capabilities for battery-free RF power,with relevance to many emerging epidermal technologies.

关键词： antenna design epidermal electronics modularization silicon nanomembrane soft-contact lamination specific absorption rate wireless power

Dual-Band Flexible MIMO Antenna with Self-Isolation Enhancement Structure for Wearable Applications

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Chinese Journal of Electronics 2023年第4期32卷 692-702页

作者： YANG Lingsheng XIE Yizhang JIA Hongting QU Meixuan LU Zhengyan LI Yajie Nanjing University of Information Science and Technology Kyushu University Zhongda Hospital Southeast University

A two-element dual-band flexible multiin multi-out antenna which can be used for wearable applications is proposed in this paper. The antenna consists of two radiating elements fed by coplanar waveguide, and a shielding layer, which are all made of flexible conductive cloth MKKTN260. Each radiating element is composed of two coupled split ring-shaped bending strips. The proposed antenna shows two measured impedance bandwidth(S1130 dB) has been achieved for both the bands. Other characteristics for wearable applications like gain, efficiency, specific absorption rate, and bending performances were also studied.

关键词： Structural rings Antenna measurements Impedance measurement Dual band Medical services Bending specific absorption rate

Calculation of Electromagnetic Field and SAR Dis- tributions of Two Antenna Structures for Bone Tu- mors Microwave Hyperthermia

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Journal of Nanjing Medical University 2003年第3期17卷 143-148页

作者：席晓莉汪文秉王丽黎西安交通大学电子与信息工程学院微波工程与光通信研究所西安710049 西安理工大学自动化与信息工程学院电子科学与技术系

Objective: To investigate the electromagnetic field and specific absorptionrate (SAR) distribution of different structure applicators with different depths for treating bonetumors using microwave hyperthermia. Methods: The finite element method (FEM) was used to calculate,electromagnetic field and SAR distribution. Two different structure applicators were simulated. Theone is simple coaxial antenna, which has been successfully used in clinic treating bone tumors inTangdu hospital of the Forth Military Medical University several years. It was formed by a coaxialcable peeled off the out copper at end. The other applicator was coaxial- slot antenna, which waswidely used in microwave hyperthermia. The applicator inserted into the cylindrical bone withdifferent depths, and worked at the frequency of 2 450 MHz. Results: The electric field and SARgenerated by the simple coaxial applicator were mainly concentrated out the tissues, and were notuniform in the tissues, while the coaxial- slot applicator well transmits the electric field and SARinto the tissues, and can easily treat different position by adjusting the slat ***: The results calculated by EFM, were well accordant with the experimental and clinicalresulls, and will be important for improving the clinical effects of microwave hyperthermia.

关键词： bone tumors microwave hyperthermia finite element method electromagnetic field specific absorption rate

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