In vitro electro-magnetism excitation positioning system for remotely monitoring capsule swallowed in digestive tract

Abstract

The digestive tract remote measuring capsule electromagnetically positioning system includes sealed capsule with three-axis magnetic field sensor, signal processing module and radio communication module; three extracorporeal ring static magnetic field exciting coils; and extracorporeal data record instrument comprising monochip computerized control circuit, constant-current source circuit, multiplex switch, radio communication module, memory and power source module. During system operation, the three coils are fixed onto the surface of body to produce magnetic field under the excitation of the current from the instrument successively, the intracorporeal capsule detects the magnetic fields and produces and emits digital signal, and the instrument receives, saves and processes the signal, so as to obtain the 3D locus of the capsule.

Description

technical field [0001] The invention relates to an in vitro positioning system for swallowable capsules, in particular to a positioning system for in vitro tracking of miniature swallowable telemetry capsules for the entire digestive tract by means of electromagnetic excitation, and belongs to the technical field of micro-electromechanical systems or biomedical engineering. Background technique [0002] With the acceleration of people's life rhythm and the continuous change of diet structure, the incidence of functional diseases of digestive tract is increasing to the first place. Modern science believes that there is a close relationship between digestive tract diseases and pressure changes in the human intestinal tract. Due to the unknown value of the correct value of the intestinal pressure in healthy people and the various changes in the intestinal cavity pressure under physiological conditions, there is a lack of Fixed objective indicators for the diagnosis of gastroint...

AI Technical Summary

Problems solved by technology

These two positioning methods use the electromagnetic signals emitted by capsules in the body. Since the human body is a very complex electromagnetic structure, the propagation of electromagnetic waves in human tissue is affected by the position, direction, electromagnetic characteristics of the tissue, tissue structure, etc. of the radiation source. Therefore, there is no accurate quantitative correspondence between the electromagnetic field strength at the body surface and the radiation source in the body so far

At the same time, using the electromagnetic field method to locate involves the calculation of a large number of electromagnetic positive problems, which makes the system structure extremely complex, and the positioning accuracy and precision need to be verified.

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