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A portable bioimpedance instrument for monitoring residual limb fluid volume in people with transtibial limb loss: A technical note.

ABSTRACT: 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.

SUBMITTER: Hinrichs P

PROVIDER: S-EPMC7417189 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature

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A portable bioimpedance instrument for monitoring residual limb fluid volume in people with transtibial limb loss: A technical note.

Hinrichs Paul P Cagle John C JC Sanders Joan E JE

Medical engineering & physics 20190422

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 d ...[more]

PMID: 31023596

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Adjustable sockets may improve residual limb fluid volume retention in transtibial prosthesis users.

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