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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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Effectiveness of elevated vacuum and suction prosthetic suspension systems in managing daily residual limb fluid volume change in people with transtibial amputation.

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