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An Implantable Magnetoelastic Sensor System for Wireless Physiological Sensing of Viscosity

[+] Author Affiliations
Umut A. Gurkan, Ozan Akkus

Purdue University, West Lafayette, IN

Paper No. SBC2007-176707, pp. 759-760; 2 pages
doi:10.1115/SBC2007-176707
From:
  • ASME 2007 Summer Bioengineering Conference
  • ASME 2007 Summer Bioengineering Conference
  • Keystone, Colorado, USA, June 20–24, 2007
  • Conference Sponsors: Bioengineering Division
  • ISBN: 0-7918-4798-5
  • Copyright © 2007 by ASME

abstract

Magnetoelastic resonance is a promising remote sensing technique which has been used for measurement of pressure, fluid flow, temperature, pH density and viscosity [1]. The main component of remote magnetoelastic sensing is a ferromagnetic metal alloy that has the ability to oscillate under the effect of an alternating magnetic field. When frequency of excitation matches with magnetoelastic beam characteristics, these materials resonate. Furthermore, the resulting resonance shifts depending on the pressure, viscosity, and temperature etc. in the vicinity of the beam which can also be collected remotely. This wireless capability without the need for power source makes this technology the most ideal for physiological sensing. Biomedical applications of these sensors are mostly limited to in vitro diagnostic applications [2–5]. The only in vivo application has been within the context of measuring the pH of the stomach in a pig model [6]. While the pig model demonstrated that signals can be transmitted through the belly of a pig, it is unknown as to whether the presence of a thick cortical bone would affect signal transmission. In this study, we assessed the feasibility of magnetoelastic wireless sensing for measuring the viscosity of bone marrow, a viscous fluid that is hidden behind both bone and muscle tissues.

Copyright © 2007 by ASME

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