Signal simulation method for electrical impedance gastric motility detection

Abstract

The invention discloses a method for simulating and detecting an impedance gastric motility signal. Stomach and tissues surrounding the stomach are simulated by using an elastic solid medium and a liquid medium with different conductivity; the elastic solid medium is pressed by a shifting fork for deformation; and a motor drives the shifting fork to move along the elastic solid medium according to a preset mode under the control of a mechanical electric control unit to generate deformation propagation so as to simulate a gastric peristalsis process. When current is injected from an exciting electrode, the boundary of the liquid medium and the solid medium deforms to change field conductivity distribution; the voltage variation of the boundary is measured from a detection electrode, is amplified, demodulated and transformed and is input into a computer to calculate and analyze an impedance signal; and the impedance change caused by conductivity change is calculated by a sensitivity coefficient method.

Description

technical field [0001] The invention relates to the field of biomedical signal detection, and is mainly used for the simulation of gastric movement and electrical impedance signal changes in the research of bioelectrical impedance gastric motility detection. Background technique [0002] Medical electrical impedance technology is a detection technology that utilizes the electrical characteristics and changing laws of biological tissues and organs to extract biomedical information related to human physiological and pathological conditions. It usually injects a small AC measurement current or voltage into the test object by means of an electrode system placed on the body surface, detects the corresponding electrical impedance and its changes, and then obtains relevant physiological and pathological information according to different application purposes. [0003] The motility of the stomach is a complex process of electrical activity-mechanical contraction and conduction, whic...

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Problems solved by technology

Therefore, it is very difficult to simulate this change with a linear resistor-capacitor network

[0009] Second, bioelectrical impedance gastric dynamics detection is different from static detections such as electrical impedance tomography and electrical impedance body composition analysis. Gastrointestinal peristalsis is the fluctuation that travels along the digestive tract during the digestion process, and the resulting impedance changes vary in time and space. is changing, to simulate such impedance changes, its implementation is also very complicated

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