Medical & Biological Engineering & Computing

, Volume 45, Issue 10, pp 997–1002

Three-dimensional power receiver for in vivo robotic capsules


  • Munho Ryu
    • Division of Bionics and BioinformaticsChonbuk National University
    • Bioengineering Research Center for the AgedChonbuk National University
    • Division of Information Engineering and TelecommunicationsHallym University
  • Hyun Uk Chin
    • Division of Information Engineering and TelecommunicationsHallym University
  • Jongwon Kim
    • Biomedlab Co.
  • Si Young Song
    • Division of Gastroenterology, Department of Internal MedicineYonsei University College of Medicine
Technical Note

DOI: 10.1007/s11517-007-0223-9

Cite this article as:
Ryu, M., Kim, J.D., Chin, H.U. et al. Med Bio Eng Comput (2007) 45: 997. doi:10.1007/s11517-007-0223-9


A three-dimensional wireless power receiver is introduced in this study for in vivo robotic capsules. It is designed to retrieve hundreds of milliwatts of power, regardless of orientation relative to the time-varying magnetic field generated by the external transmitter outside a test animal body. Design issues, such as antenna structure and rectification topology, are discussed, considering limitations of physical space. Various design parameters are implemented and experimented. A selected design is implemented and tested for power variations on rotational positions relative to the transmitter magnetic field. The presented receiver delivers more than 300 mW of power regardless of its orientation. A test capsule is assembled with LED load for in vivo experiments. Visual verification of the light intensity of LED shows that the power-receiving performance of the receiver is not affected inside the animal body.


3D wireless power receiverIn vivo robotic capsuleRectifyingRegulating

Copyright information

© International Federation for Medical and Biological Engineering 2007