ABSTRACT
Objective To study the phase correlation of cutaneous multichannel impedance measurements and the contractions, peristalsis of stomach and the conduction properties in space.Methods A spiral gastric body model was rotated to simulate shrinkage and creep of the stomach.In order to verify the feasibility and validity of the multichannel impedance gastric dynamic measurement, experiments with emulation of multichannel impedance gastric motility measuring principle were conducted through three-dimensional simulation on the electrical characteristics of gastric body model in saline tank simulator.Results The emulation results showed that the change of epigastric current density and potential distribution is consistent with the course of moving from top to bottom when lateral edge of model (namely the intumescent location when the stomach is full) after detecting electrodes in sequence.Meanwhile, the measurement voltage wave forms clearly showed the contraction location of stomach after the model rotating for three cycles in a row, and the phase relationship between adjacent measurement channels was also measured.The sixty seconds data acquired by the experiment device proved that voltage wave form of three measurement channels corresponded to the phase relationship of movement status of the gastric body model.Conclusions Cutaneous multichannel wave forms prove a cyclical movement of stomach, and phase difference among the multichannel signals relating to speed of peristaltic wave, position of the measuring electrodes and channel spacing, etc.This study provides simulation and experimental basis for explanation of quantitative study of conduction properties in space and phase relationship between the results of surface multichannel impedance measurements and the contractions, peristalsis of stomach.