K.U.Leuven, ESAT-MICAS, Kasteelpark Arenberg, B-3001 Leuven, Belgium.
Biosens Bioelectron. 2009 Dec 15;25(4):845-51. doi: 10.1016/j.bios.2009.08.049. Epub 2009 Sep 4.
This paper describes the integration of an active locomotion module in a wirelessly powered endoscopic capsule. The device is a submersible capsule optimized to operate in a fluid environment in a liquid-distended stomach. A 3D inductive link is used to supply up to 400mW to the embedded electronics and a set of 4 radio-controlled motor propellers. The design takes advantage of a ferrite-core in the receiving coil-set. This approach significantly improves the coupling with the external field source with respect to earlier work by the group. It doubles the power that can be received with a coreless coil-set under identical external conditions. The upper limit of the received power was achieved complying with the strict regulations for safe exposure of biological tissue to variable magnetic fields. The wireless transferred power was proven to be sufficient to achieve the speed of 7cm/s in any directions. An optimized locomotion strategy was defined which limits the power consumption by running only 2 motors at a time. A user interface and a joystick controller allow to fully drive the capsule in an intuitive manner. The device functionalities were successfully tested in a dry and a wet environment in a laboratory set-up.
本文介绍了在无线供电内窥镜胶囊中集成主动运动模块。该设备是一种可在充满液体的胃部液体环境中优化运行的潜水胶囊。使用 3D 感应链路为嵌入式电子设备和一组 4 个无线电控制的螺旋桨提供高达 400mW 的功率。该设计利用了接收线圈组中的铁氧体磁芯。与该团队早期的工作相比，这种方法显著提高了与外部场源的耦合。在相同的外部条件下，无芯线圈组接收的功率增加了一倍。在满足对生物组织可变磁场安全暴露的严格规定的情况下，达到了接收功率的上限。事实证明，无线传输的功率足以实现任何方向 7cm/s 的速度。定义了一种优化的运动策略，该策略通过一次仅运行 2 个电机来限制功耗。用户界面和操纵杆控制器允许以直观的方式完全驱动胶囊。该设备的功能已在实验室设置的干燥和潮湿环境中成功测试。
