Magnetic tracking

This paper will introduce a location detecting system that aims to track a stent when it is deployed into the human artery to achieve hemostasis. It is proposed to treat an injured soldier on the battlefield, where common surgical devices such as a fluoroscopy system are not available. The locating approach in this paper utilizes a magnet outside the human body as the reference, and a magnetic field sensor that will be deployed inside the artery with the stent. The sensor can detect its location in a coordinate system centered with the reference magnet. In practice, the main challenge is that the locating accuracy will be deteriorated by external magnetic interference, rotation of the sensor, and random noise. These causes of error are addressed in the paper to improve the locating accuracy and repeatability under various conditions. Finally, the system’s performance in locating the stent, including effects of the disturbance eliminating procedures, will be validated in benchtop experiments. 

本文将介绍一款位置检测系统，其旨在对植入人体动脉以实现止血的支架（stent）进行追踪。该系统专为战场环境下救治负伤士兵设计，彼时无法使用X线透视系统等常规手术器械。本文提出的定位方案以体外磁体作为参考基准，并搭配一款与支架一同置入动脉内的磁场传感器，该传感器可在以参考磁体为中心的坐标系中检测自身位置。实际应用中，定位精度易受外部磁干扰、传感器自身旋转及随机噪声的影响而下降。本文针对上述各类误差来源展开研究，以提升不同工况下的定位精度与重复定位稳定性。最后，本文将通过台架实验验证该系统的支架定位性能，包括干扰消除流程的实际效果。