A Wireless, Passive Magnetoelastic Force–Mapping System for Biomedical Applications

Author:

Pereles Brandon D.1,DeRouin Andrew J.1,Ghee Ong Keat2

Affiliation:

1. e-mail:

2. e-mail:  Department of Biomedical Engineering, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931

Abstract

A wireless, passive force–mapping system based on changes in magnetic permeability of soft, amorphous Metglas 2826MB strips is presented for long-term force/stress monitoring on biomedical devices. The presented technology is demonstrated for use in lower-limb prosthetics to ensure proper postoperative fitting by providing real-time monitoring of the force distribution at the body-prosthesis interface. The sensor system consisted of a force-sensitive magnetoelastic sensing strip array that monitored applied loading as an observed change in the peak amplitude of the measured magnetic higher-order harmonic signal of each array element. The change in higher-order harmonic signal is caused by the change in the magnetic permeability of the sensing strips that corresponds to an increase in strip magnetization. After loading, the measured higher-order harmonic signals were fed into an algorithm to determine the applied forces, allowing for determination of the real-time loading profile at the body prosthesis interface.

Publisher

ASME International

Subject

Physiology (medical),Biomedical Engineering

Reference11 articles.

1. Biomechanics of Pressure Ulcer in Body Tissues Interacting With External Forces During Locomotion;Annu. Rev. Biomed. Eng.,2010

2. Review of Secondary Physical Conditions Associated With Lower-Limb Amputation and Long-Term Prosthesis Use;J. Rehabil. Res. Dev.,2008

3. Stump Ulcers and Continued Prosthetic Limb Use;Prosthet. Orthot. Int.,2006

4. State-Of-The-Art Research in Lower-Limb Prosthetic Biomechanics-Socket Interface: A Review;J. Rehabil. Res. Dev.,2001

5. Laboratory and Clinical Tests of a Prototype Pressure Sensor for Clinical Assessment of Prosthetic Socket Fit;Prosthet. Orthot. Int.,2002

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