A novel method for measuring the cross-sectional area of and flow rate through the upper gastrointestinal system a feasibility study

Henry Buchwald, Thomas J. O'Dea

Research output: Contribution to journalArticlepeer-review

Abstract

Ascertaining the success of metabolic/bariatric surgery procedures and modifying their dynamics today lack noninvasive, accurate, and objective assessment technology. The feasibility of a method for measuring the cross-sectional area of and flow through the upper gastrointestinal system by electromagnetic induction is described. Our method depends on the change in resonance frequency of a series circuit (capacitor, inductor, and resistor) when changing the induction parameters. This is done by placing a coil constructed of multiple loops of wire around a substance of high magnetic permeability. A large coil and a 52-in-circumferencesimulation, 2-chambered, cylinder and a small coil and a test tube were used for these studies. Five feasibility experiments were performed using a standard protocol. Results demonstrated that using both the large coil and the small coil apparatus, the magnetic permeability compared with air of 3 paramagnetic substances Viron filings, Ferrite75, and Ferrite 78Vwere roughly equivalent, although the results showed greater differentiation with the small coil; lactated Ringer solution in the middle chamber of the large coil cylinder showed no change in various resonance frequencies; and sensitivity discrimination using the small coil between a 2-cm and a 1.5-cm tube filled with iron filings demonstrated reasonable sensitivity for the system, with comparable outcomes for the large coil.

Original languageEnglish (US)
Pages (from-to)184-189
Number of pages6
JournalJournal of Clinical Engineering
Volume39
Issue number4
DOIs
StatePublished - Jan 1 2014

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