文章基本信息

标题：Design, Fabrication, and Implementation of a Wireless, Passive Implantable Pressure Sensor Based on Magnetic Higher-Order Harmonic Fields
本地全文：下载
作者：Ee Lim Tan ; Andrew J. DeRouin ; Brandon D. Pereles 等
期刊名称：Biosensors
电子版ISSN：2079-6374
出版年度：2011
卷号：1
期号：4
页码：134-152
DOI：10.3390/bios1040134
语种：English
出版社：MDPI Publishing
摘要：A passive and wireless sensor was developed for monitoring pressure in vivo. Structurally, the pressure sensor, referred to as the magneto-harmonic pressure sensor, is an airtight chamber sealed with an elastic pressure membrane. A strip of magnetically-soft material is attached to the bottom of the chamber and a permanent magnet strip is embedded inside the membrane. Under the excitation of an externally applied AC magnetic field, the magnetically-soft strip produces a higher-order magnetic signature that can be remotely detected with an external receiving coil. As ambient pressure varies, the pressure membrane deflects, altering the separation distance between the magnetically-soft strip and the permanent magnet. This shifts the higher-order harmonic signal, allowing for detection of pressure change as a function of harmonic shifting. The wireless, passive nature of this sensor technology allows for continuous long-term pressure monitoring, particularly useful for biomedical applications such as monitoring pressure in aneurysm sac and sphincter of Oddi. In addition to demonstrating its pressure sensing capability, an animal model was used to investigate the efficacy and feasibility of the pressure sensor in a biological environment.
关键词：biomedical instruments; biosensors; higher-order harmonic fields; implantable sensors; magnetic detection; noninvasive monitoring; passive; pressure; soft magnetic materials; wireless sensors