全消化道微型诊查胶囊的遥测定位

Telemetric Localization of Detecting Capsule in Gastrointestinal Tract

目的为了对微型诊查胶囊进入消化道后的三维方位进行连续跟踪,提出了一种新的遥测定位方案。方法在诊查胶囊内封装三轴磁传感器,同时在人的体表布置3个励磁线圈分时励磁,通过接收磁传感器检测的磁场大小,反求胶囊的空间方位。结果根据定位方案成功构建了定位系统;建立了基于励磁线圈空间电磁场分布的定位模型;并运用全局收敛的神经网络算法求解高维非线性定位方程组,确定出胶囊的空间方位。结论实验证明,定位方案正确可行,定位精度高于现有方法,还可实现连续定位及便携式应用。本研究实用后,可用于监测航天员进入太空后的消化道生理参数和动力性能,为选择航天食品提供依据。

Objective To develop a method for localizing a detecting capsule in the gastrointestinal tract. Methods A three-axis magnetic sensor was sealed in the detecting capsule. Three flat coils were fixed on patients＇ back. The coils were excited one by one to generate electromagnetic fields. The position and the orientation of the capsule could be determined by telemetering the signals from the magnetic sensor incorporated in the capsule. Results The telemetric localization system worked successfully. A localization model describing the relationship between the magnetic field strength and the position and orientation of the capsule, was correctly established basing on the principle of magnetic dipoles, and neural network algorithm was employed to solve a non-linear equation set. Conclusion The results showed that the localization method is feasible and the precision is higher than existing methods. The localization device can perform consecutive tracking and can be made into a portable type. After putting into practice, the device can also be used in food selection for astronauts by monitoring their gastrointestinal parameters in space.