Zan Peng, Liu Jinding, Ai Yutao, Jiang Enyu
Department of Automation, College of Mechatronics Engineering and Automation, Shanghai University, Shanghai, PR China.
J Med Eng Technol. 2013 May;37(4):307-12. doi: 10.3109/03091902.2013.796011. Epub 2013 May 24.
This paper presents a wireless, miniaturized, bi-directional telemetric artificial anal sphincter system that can be used for controlling patients' anal incontinence. The artificial anal sphincter system is mainly composed of an executive mechanism, a wireless power supply system and a wireless communication system. The wireless communication system consists of an internal RF transceiver, an internal RF antenna, a data transmission pathway, an external RF antenna and an external RF control transceiver. A micro NMHA (Normal Mode Helical Antenna) has been used for the transceiver of the internal wireless communication system and a quarter wave-length whip antenna of 7.75 cm has been used for the external wireless communication system. The RF carrier frequency of wireless communication is located in a license-free 433.1 MHz ISM (Industry, Science, and Medical) band. The radiation characteristics and SAR (Specific Absorption Rate) are evaluated using the finite difference time-domain method and 3D human body model. Results show that the SAR values of the antenna satisfy the ICNIRP (International Commission on Nonionizing Radiation Protection) limitations.
本文介绍了一种可用于控制患者肛门失禁的无线、小型化、双向遥测人工肛门括约肌系统。该人工肛门括约肌系统主要由执行机构、无线供电系统和无线通信系统组成。无线通信系统由内部射频收发器、内部射频天线、数据传输路径、外部射频天线和外部射频控制收发器组成。内部无线通信系统的收发器采用了微型NMHA（正常模式螺旋天线），外部无线通信系统采用了7.75厘米的四分之一波长鞭状天线。无线通信的射频载波频率位于免许可证的433.1 MHz ISM（工业、科学和医疗）频段。使用有限差分时域方法和3D人体模型评估辐射特性和比吸收率（SAR）。结果表明，天线的SAR值符合国际非电离辐射防护委员会（ICNIRP）的限制。
