Design, fabrication, and implementation of a wireless, passive implantable pressure sensor based on magnetic higher-order harmonic fields

Authors

Ee Lim Tan, Michigan Technological University
Andrew DeRouin, Michigan Technological UniversityFollow
Brandon D. Pereles, Michigan Technological University
Keat Ghee Ong, Michigan Technological UniversityFollow

Document Type

Article

Publication Date

10-17-2011

Department

Department of Biomedical Engineering

Abstract

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.

Publisher's Statement

© 2011 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/). Publisher’s version of record: https://doi.org/10.3390/bios1040134

Publication Title

Biosensors

Recommended Citation

Tan, E. L., DeRouin, A., Pereles, B. D., & Ong, K. G. (2011). Design, fabrication, and implementation of a wireless, passive implantable pressure sensor based on magnetic higher-order harmonic fields. Biosensors, 1(4), 134-152. http://doi.org/10.3390/bios1040134
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/1995

Creative Commons License

This work is licensed under a Creative Commons Attribution 3.0 License.

Version

Publisher's PDF