|Toshihiro Kumagai||Graduate School of Engineering, Chiba University, Japan|
|Kazuyuki Saito||Research Center for Frontier Medical Engineering, Chiba University, Japan|
|Masaharu Takahashi||Research Center for Frontier Medical Engineering, Chiba University, Japan|
|Koichi Ito||Graduate School of Engineering, Chiba University, Japan|
Wireless power transmission is being investigated as a means to operate tiny medical devices such as the capsular endoscope, which is able to exist for a long period during diagnostic procedures within the body. In this paper, we examine the wireless power transmission to a capsular endoscope by electromagnetic waves to show its usability for medical applications. A modified helical antenna inside the endoscope is proposed as a power receiving antenna, operating at 915 MHz. By calculating a maximum received power in the stomach using such antenna, the results show that adequate power can be well received.
Capsular endoscope; Helical antenna; Medical application; Receiver; Wireless power transmission
Given Imaging Homepage, 2001. PillCam SB. Available at: [Accessed Jan. 5, 2011].
Gozalvez, J., 2007. WiTricity-The Wireless Power Transfer, IEEE Vehicular Technology Magazine, Volume 2, pp. 38-44.
Japanese Ministry of Internal Affairs and Communications–MIC, 2009. Available at:
Murakuni, E., Higaki, N., Shiba, K., 2009. Analysis of Human Body Electric Field Distribution Using the Transmitting Antenna in an Implantable Device, ITE Technical Report, Volume 33, Number 15, pp.13–18.
Niu, Q., Wang, L., Dong, T.,Yang, H., 2009. Application of a MEMS-based Energy Harvester for Artificial Heart Wireless Energy Transmission, Proceedings of 2009, ISECS International Colloquium on CCCM, Volume 1, pp.38–41.
Olympus Medical Systems Corp., 2005. Endo Capsule. Available at: [Accessed Jan. 5, 2011].
RF SYSTEM lab., 2005. Sayaka. Available at: [Accessed Jan. 5, 2011].
Rodenbeck, C.T., Li, M.Y., Chang, K., 2004. A Phased-Array Architecture for Retrodirective Microwave Power Transmission from the Space Solar Power Satellite, Microwave Symposium, Volume 3, pp.1679–1682.
Shinohara, N., & Matsumoto, H., 2004. Wireless Charging System by Microwave Power Transmission for Electric Motor Vehicles, the Institute of Electronics, Information and Communication Engineers (IEICE) Transaction on Electronics, Volume J87-C, Number 5, pp.433–44.