Establishment and Simulation of 3D Gastric Impedance Detection Model

This paper builds a three-layer electrical impedance imaging (EIT) model. The changes in gastric impedance information in gastric contents and gastric volume of different conductivity were studied in different electrode excitation models. In this paper, the human abdominal cavity model was constructed by using COMSOL MULTIPHYSICS simulation software, and a 48-electrode system was constructed on the outer layer of the model. In the experiment, two models of relative electrode excitation and adjacent electrode excitation were established, and the simulated gastric emptying process was simulated. Secondly, by measuring the voltage and analyzing the data. Finally, the system is evaluated by using the boundary measurement voltage sensitivity δ and the boundary voltage measurement dynamic range Ũ. The analysis shows that the relative electrode excitation model has lower sensitivity and better signal-to-noise ratio for system detection and stability. At the same time, it is proved that more gastric emptying information can be obtained through the three-layer EIT model, which can effectively reflect different relevant impedance information of gastric contents.