中文摘要：

磁场分布模型是体内微型诊疗装置磁定位方法中的关键问题。使用两种常用的静态磁场分布模型,磁偶极子模型和等效磁荷模型分别对微型施药胶囊中使用的圆柱形永磁体的空间磁场进行了仿真计算和对比,仿真结果表明当场点到源点的距离r大于10倍圆柱永磁体尺寸时,两种模型的计算结果非常接近。在实验平台上进行的实验也得到与仿真相同的结果,说明在磁传感器与永磁体的距离大于10倍永磁体尺寸的前提下,磁偶极子模型是适用于体内微型诊疗装置的磁定位的。

英文摘要：

The mathematical model of magnetic field produced by the permanent magnet is a key problem on magnetic localization of micro-medical devices in human body. Magnetic dipoles model and equivalent magnetic monopoles model are two often used models for obtaining static magnetic field distribution. The two models were used to simulate the magnetic field of cylinder magnet used in the drug delivery capsule. The calculation results of the two models are very close when the distance between the field point and the magnet is larger as 10 times of the magnet＇s size. The real experiments on the experimental device approved the simulation results, which mean that the magnetic dipoles model is suitable for magnetic localization of micro-medical devices in human body when the distance between the magnet and the magnetic sensor is larger as 10 times of the magnet＇s size.