In view of fuzzy and unstable images received in video capsule endoscopy, and the poor communication
effect, an improved radio frequency (RF) transmission circuit module with low power consumption and helix
antenna is designed to improve the performance of video transmission and to extend the working time of the
capsule. Simulation and analysis of the circuits and antenna with HFSS12 and ADS2011 software are highlighted.
Video capsule endoscope prototypes are made and evaluated to verify the feasibility of the proposed design. In
vitro tests and animal experiments show that the results of the antenna tests basically meet the simulation, and
the power consumption of RF circuit is 15.9mV. The video capsule endoscope works well with the receiver with
multiple receiving antennas, and the working time is more than 9 h. It can realize the wireless transmission of the
video data, and images received are clear and stable in comparison with the previous designs.
LIU Gang* (刘刚), YAN Guozheng (颜国正), ZHU Bingquan (朱柄全), XU Wenming (徐文铭)
. Optimization Design and Experiment of the Radio Frequency Transmission Utilized in Video Capsule Endoscope[J]. Journal of Shanghai Jiaotong University(Science), 2016
, 21(1)
: 1
-6
.
DOI: 10.1007/s12204-016-1692-5
[1] LIU G, YAN G Z, LIU H, et al. Design and experimentof intermittent working image capsule endoscopy[J]. Optics and Precision Engineering, 2012, 20(10):2192- 2199 (in Chinese).
[2] GU W Z. The research progress and discussion aboutwireless capsule endoscope [J]. China Medical Devices,2011, 26(8): 60-62 (in Chinese).
[3] IDDAN G, MERON G, GLUKHOVSKY A, et al.Wireless capsule endoscopy [J]. Nature, 2000, 405:417.
[4] SWAIN P, IDDAN G J, MERON G, et al. Wirelesscapsule endoscopy of the small bowel: Development,testing and first human trials [C]//Proceedingsof SPIE. Israel: Biomonitoring and Endoscopy Technologies,2001: 19-23.
[5] PI X T, PENG C L, ZHENG X L, et al. Progressof capsule-style medical micro-instrument [J]. ChineseMedical Equipment Jounal, 2004, 25(3): 29-32 (in Chinese).
[6] MA Y, MA CH, TAN Y E. Clinical application analysisof domestic OMOM capsule endoscopy [J]. Journalof Yan’an University (Medical Science Edition), 2008,6(3): 111-113 (in Chinese).
[7] JIN A Q, HUANG X J, LIU Z Y. The initial studyof the diagnostic value of OMOM capsule endoscopyin small bowel diseases [J]. Chinese Journal of ClinicalGastroenterology, 2009, 21(1): 28-30 (in Chinese).
[8] YAO H P, WANG W H. Improvement design on thetransmission circuit of wireless capsule endoscope system[J]. Modern Manufacturing Engineering, 2011 (6):111-115 (in Chinese).
[9] LIU J Q, HUANG P. Study on the design and experimentof wireless endoscopy in body based on OV6920[J]. Machinery Design & Manufacture, 2010 (6): 183-185 (in Chinese).
[10] CHIRWA L C, HAMMOND P A, ROY S, et al.Electromagnetic radiation from ingested sources in thehuman intestine between 150 MHz and 1. 2 GHz [J].IEEE Transactions on Biomedical Engineering, 2003,50(4): 484-492.
[11] LI X Q. Investigations of high-power radial line helicalarray antenna [D]. Chengdu: School of Physical Scienceand Technology, Southwest Jiaotong University,2008 (in Chinese).
[12] LIU G, YAN G Z, JIANG P P, et al. Design and Experimentof wireless powered image capsule endoscopy[J]. Acta Electronica Sinica, 2013, 41 (10): 1983-1987(in Chinese).
[13] MIAO Y C, JING S Z. Simulation of axial mode helicalantennas [J]. Electrinics Quality, 2012 (5): 73-74(in Chinese).
[14] CUI C, LIAO B. Study on a near-field coupling of normalmode helical antenna [J]. Information Technology,
2011 (8): 150-152 (in Chinese).[15] LIU H Y, QIAO P P, WU X L, et al. A smart capsulesystem of gastric occult blood detection [J]. BiomedicalMaterials and Engineering, 2014, 24(1): 519-528.
[16] SODHRO A H, LI Y. Battery-friendly packet transmissionstrategies for wireless capsule endoscopy[C]//Proceedings of the International Conference onHealth Informatics. Switzerland: Springer-Verlag,2014: 236-239.
