Journal
MEDICAL ENGINEERING & PHYSICS
Volume 68, Issue -, Pages 101-107Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.medengphy.2019.04.002
Keywords
Bioimpedance; Amputee; Residual limb; Fluid volume; Prosthetic fit; Volume accommodation
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Funding
- US Army Medical Research Acquisition Activity (USAMRAA) [W81XWH-16-C-0020]
- National Institutes of Health [R01HD060585]
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People with transtibial limb loss experience daily changes in volume of their residual limb that affect the fit of their prosthetic socket. A portable instrument was developed to monitor fluid volume changes outside of the laboratory setting. The bioimpedance system applied 26 current bursts per second at frequencies between 3 kHz and 1 MHz, and sensed voltage at up to six channels. Among six voltage-controlled current source circuits and five receive-channel amplifier topologies considered, a differential Howland current pump and a single receive-channel instrumentation amplifier proved the best combination of low noise and low power consumption. Mean RMS errors were 0.07% for extracellular fluid resistance, 2.23% for intracellular fluid resistance, and 1.15% for membrane capacitance. (C) 2019 IPEM. Published by Elsevier Ltd. All rights reserved.
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