人体消化道内微机电系统线圈耦合系数分析

在人体消化道微机电系统无线能量传输系统中,线圈间的耦合程度是影响传输效率的关键因素之一.本文对空间任意位置的两个线圈建立耦合模型,提出了一种计算线圈耦合系数的方法,分析了轴向偏移、径向偏移、角度偏移对耦合程度的影响,与实验结果吻合较好.最后利用这种方法,比较分析了能量传输系统中发射线圈的两种布置方式.     

胶囊机器人无线能量传输系统设计

目的胶囊内镜机器人受尺寸限制和安全性等因素的影响,传统锂电池或拖缆式供能已不能满足要求,如何提供有效的供能方式成为其发展的重大瓶颈。随着无线供能方式的提出,基于电磁感应的无线能量传输被视为一种有效解决该问题的供能方式。方法设计了一个在任意姿态下接收线圈均能高效稳定供能胶囊机器人的无线能量传输系统。首先设计了符合赫姆霍兹线圈结构的双螺线管对线圈作为发射线圈,再结合机器人结构特征设计新型的磁芯结构和绕线方式,构成新型三维正交接收线圈。最后在由发射线圈和体外控制电路组成的可调谐发射平台上进行了0~360°范围内系统有效接收效率的测试。结果该系统能量传输效率在线圈任意姿态不低于4.95%,解决了因接收线圈姿态变化导致的供能不足问题。结论在输入功率为10.88 W条件下能提供最少544 m W的能量,实验验证了该系统的可行性。     

人工肛门括约肌经皮能量传输系统研究

针对现有人工肛门括约肌系统无供能装置或供能装置更换可能引发感染等问题,本文提出了电磁谐振耦合的无线供能方法,对人工肛门括约肌系统进行非接触的经皮无线供能.本文在对能量传输电路、发送接收线圈参数研究基础上,提出通过选择SRC电路作为发射、接收端耦合电路以增大铁芯耦合面积,从而提高发射及接收线圈Q值,进而提高能量传输效率.实验结果表明,使用G25磁芯线圈进行电磁耦合,当两线圈轴向距离为10mm时,能量传输效率可高于60%,可保证人工肛门括约肌系统的正常工作.     

植入式无线能量传输系统

目的提出一种适用于植入式医疗设备的无线供电系统,引入磁谐振耦合供能的方法,并通过建立理论线圈仿真模型计算线圈尺寸与谐振频率,有效解决植入式装置无线供电距离远、尺寸小等难题,使植入式装置可无需更换电池而终生使用。方法首先通过MATLAB仿真耦合谐振线圈模型以及无线能量传输模型,并计算出满足条件的最优线圈设计。然后依据仿真结果制作发射线圈与接收线圈,设计植入式无线供电实际硬件系统,使系统在限定的距离等条件下有最优的传输效率。结果仿真算法能有效描述磁耦合谐振,计算与测量可以得到Q、L的理论与实际的平均相对误差E_Q=5.34%、E_L=4.42%,为实际供电系统的设计提供了参考依据。设计实现了适合于医疗植入的微型供电系统,增加了传输距离。该方案采用线圈大对小设计,植入部分尺寸仅有18 mm,体外线圈直径85mm,实际最高传输效率达到16.20%,80 mm距离可以供能2.642 m W。结论该仿真算法可为耦合谐振设计提供参考,为植入式医疗系统提供一种新的设计方案。     

反馈式人工肛门括约肌的经皮能量传输系统

针对反馈式人工肛门括约肌的供能问题,研究经皮能量传输系统原理,并研制出经皮能量传输系统,使得反馈式人工肛门括约肌能够模拟实现人体排便功能。通过实验分析接收端负载以及两线圈位置偏移对传输效率的影响,验证了系统的传输性能。实验结果表明,研制的经皮能量传输系统在发射和接收线圈轴向距离为15mm条件下,能稳定传输超过400mW功率,传输效率可达10％,保证人工肛门括约肌的正常工作。     

微型诊疗系统无线供能技术及其生物电磁效应研究

目的 针对人体肠道内微型诊疗系统能量供应问题,研究了一种基于电磁耦合的无线能量传输系统,并对其产生的生物电磁效应进行分析.方法 围绕在人体腹部的发射线圈产生的交变磁场,体内微小线圈产生感应电动势为肠内诊疗系统提供电能.为了研究电磁场在人体组织产生的生物效应,本文首先采用图像分割技术对人体横断面图像进行组织识别,建立了包含56种组织的高精度三维真实人体数字化模型,然后通过数值计算的方法研究了能量传输系统的生物电磁效应.结果 获得电流密度、比吸收率、磁场强度在人体的分布,以及不同频率下全身平均比吸收率.结论 生物电磁效应的研究为无线供能技术在人体肠道诊疗系统的应用奠定了生物安全性基础.     

一种用于体内诊疗装置的无线能量传输方案

针对体内的诊疗装置的能量供给问题,笔者提出了一种无线能量传输的方案;同时还设计了一套可进行无线能量传输的装置.实验结果表明,用该装置能够有效地进行能量的无线传输.     

可植入人体医疗设备的无线能量传输系统仿真分析

针对传统可植入人体医疗设备供能方式的不足,运用谐振耦合无线能量传输技术,设计可用于心脏起搏器等医疗设备的电能传输系统。结合植入式医疗设备尺寸小的特点,引入8字形线圈结构,采用有限元仿真软件分析各相关参数对于输出功率的影响,得到系统的最优参数。分析了在人体模型中产生的磁感应强度和电场强度分布,参考国际非电离辐射防护委员会（ICNIRP）制定的限值进行对比分析,评估了该系统电磁暴露的安全性,结果表明系统能够安全实现无线能量传输。     

一种通过电感耦合线圈高效低灵敏度地穿越皮肤进行能量和数据的传输

本文介绍了一种采用电感耦合方法进行无线电信号和能量传输的新途径。该方法能寻找到该传输电路整体效率的最大值。这种传输电路是由一个电感耦合线圈和一个功率放大器构成。其中采用的功放为单端E类放大器,能进行等幅振荡,振荡频率由耦合线圈决定。这种改进的功率传输线路能改变频率的相位使该耦合线圈的传     

基于新型微泵的人造肛门括约肌系统

人造肛门括约肌系统可以模拟人体正常肛门括约肌的工作,解决肛门失禁问题,缓解直肠切除病人的生活和心理压力.研究了人造肛门括约肌系统中的核心装置,提出了一种基于螺母丝杆结构的新型微泵,根据微泵的功率要求设计了无线能量传输模块,并进行了样机实验.测试结果表明该泵可以满足人造肛门括约肌系统的基本功能,该系统可以有效地控制肛门失禁问题.     

Study on Wireless Power Transmission for Gastrointestinal Microsystems Based on Inductive Coupling

INTRODUCTION The interests in capsule endoscope (CE) have increased significantly in recent years. The firstcommercialized CE, M2A can transmit images at the rate of two frames per second[1]. The capsule ispropelled forward passively by gastrointestinal peristalsis waves with digestion. It does not work well forsome diseases, such as constipation, since it can only work continuously for seven hours due to the vol-ume of the batteries integrated in the capsule. A newtype of capsule endo…     

胶囊内窥镜无线能量传输系统的人体安全性研究

采用电磁感应方式为体内胶囊内窥镜供能时,人体必然暴露于发射线圈产生的强电磁场中.本研究采用数值计算的方法,在包含62种人体组织、分辨率为0.33 mm×0.33 mm×2 mm的三维真实人体仿真模型上求解人体不同组织在该电磁场中的感应电流密度和比吸收率,并根据国际非电离辐射防护委员会安全性标准对其进行安全性评估.结果表明,发射功率为25 W,谐振频率为266.5 kHz的能量传输系统产生的电磁场对人体是安全的.本研究为无线能量传输系统奠定了生物安全性基础.     

Improvement of wireless power transmission efficiency of implantable subcutaneous devices by closed magnetic circuit mechanism

Induction coils were fabricated based on flexible printed circuit board for inductive transcutaneous power transmission. The coil had closed magnetic circuit (CMC) structure consisting of inner and outer magnetic core. The power transmission efficiency of the fabricated device was measured in the air and in vivo condition. It was confirmed that the CMC coil had higher transmission efficiency than typical air-core coil. The power transmission efficiency during a misalignment between primary coil and implanted secondary coil was also evaluated. The decrease of mutual inductance between the two coils caused by the misalignment led to a low efficiency of the inductive link. Therefore, it is important to properly align the primary coil and implanted secondary coil for effective power transmission. To align the coils, a feedback coil was proposed. This was integrated on the backside of the primary coil and enabled the detection of a misalignment of the primary and secondary coils. As a result of using the feedback coil, the primary and secondary coils could be aligned without knowledge of the position of the implanted secondary coil.     

Location estimation of an in vivo robotic capsule relative to arrayed power transmission coils

A tracking method is presented here for an in vivo robotic capsule with power supplied from one of the multiple power transmission coils. The proposed method aims to select the best coupled coil among the array of power transmission coils. It relies on the fact that the driving current of the power transmitter increases with inductive coupling of the receiver coil inside the capsule with the transmitter coil. Investigation of the current increase characteristic according to its location relative to the transmission coils allows development of a strategy for the in vivo robotic capsule. This study shows results with two transmission coils and a two-dimensional power receiver. Experimental results present the possibility of selecting the best coil by estimating the relative location of the capsule.     

Design of radio-frequency powered coils for implant instruments

Radio frequency (r.f.) has been investigated as a means of externally powering miniature and long term implant telemetry systems. Optimum power transfer from the transmitter to the receiving coil is desired for total system efficiency. A seven step design procedure for the transmitting and receiving coils is described based on r.f., coil diameter, coil spacing, load and the number of turns of the coil. An inductance tapping circuit and a voltage doubler circuit have been built in accordance with the design procedure. Experimental results were within the desired total system efficiency ranges of 18% and 23%, respectively.     

胶囊内窥镜能量发射装置的设计及实现

体外能量发射装置是胶囊内窥镜无线供能系统中很重要的一部分。为了使胶囊内窥镜获得较稳定能量,同时研究传输效率和人体安全性与谐振频率的关系,设计了一种可在人体消化道区域内产生均匀交变电磁场、谐振频率在10—400kHz范围内调节的体外能量发射装置。根据无线供能系统的要求设计了该装置的发射线圈、驱动电路,并实际搭建了整个装置。实际使用验证了该能量发射装置设计的可行性,并取得了较好的效果。     

Portable wireless power transmission system for video capsule endoscopy

Wireless power transmission is considered a practical way of overcoming the power shortage of wireless capsule endoscopy (VCE). However, most patients cannot tolerate the long hours of lying in a fixed transmitting coil during diagnosis. To develop a portable wireless power transmission system for VCE, a compact transmitting coil and a portable inverter circuit driven by rechargeable batteries are proposed. The couple coils, optimized considering the stability and safety conditions, are 28 turns of transmitting coil and six strands of receiving coil. The driven circuit is designed according to the portable principle. Experiments show that the integrated system could continuously supply power to a dual-head VCE for more than 8?h at a frame rate of 30 frames per second with resolution of 320?×?240. The portable VCE exhibits potential for clinical applications, but requires further improvement and tests.