Improved Reception of In-Body Signals by Means of a Wearable Multi-Antenna System

High data-rate wireless communication for in-body human implants is mainly performed in the 402–405 MHz Medical Implant Communication System band and the 2.45 GHz Industrial, Scientific and Medical band. The latter band offers larger bandwidth, enabling high-resolution live video transmission. Although in-body signal attenuation is larger, at least 29 dB more power may be transmitted in this band and the antenna efficiency for compact antennas at 2.45 GHz is also up to 10 times higher. Moreover, at the receive side, one can exploit the large surface provided by a garment by deploying multiple compact highly efficient wearable antennas, capturing the signals transmitted by the implant directly at the body surface, yielding stronger signals and reducing interference. In this paper, we implement a reliable 3.5 Mbps wearable textile multi-antenna system suitable for integration into a jacket worn by a patient, and evaluate its potential to improve the In-to-Out Body wireless link reliability by means of spatial receive diversity in a standardized measurement setup. We derive the optimal distribution and the minimum number of on-body antennas required to ensure signal levels that are large enough for real-time wireless endoscopy-capsule applications, at varying positions and orientations of the implant in the human body.

[1]  Zhihua Wang,et al.  Low-Power Transceiver Analog Front-End Circuits for Bidirectional High Data Rate Wireless Telemetry in Medical Endoscopy Applications , 2007, IEEE Transactions on Biomedical Engineering.

[2]  Jingjing Shi,et al.  Channel characterization and diversity feasibility for in-body to on-body communication using low-band UWB signals , 2010, 2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010).

[3]  Tammam Tillo,et al.  Review of the Wireless Capsule Transmitting and Receiving Antennas , 2012 .

[4]  A. Alomainy,et al.  Modelling and Characterisation of Radio Propagation from Wireless Implants at Different Frequencies , 2006, 2006 European Conference on Wireless Technology.

[5]  E. Topsakal,et al.  Design of a Dual-Band Implantable Antenna and Development of Skin Mimicking Gels for Continuous Glucose Monitoring , 2008, IEEE Transactions on Microwave Theory and Techniques.

[6]  P.D. Bradley,et al.  An ultra low power, high performance Medical Implant Communication System (MICS) transceiver for implantable devices , 2006, 2006 IEEE Biomedical Circuits and Systems Conference.

[7]  Yi Luo,et al.  125Mbps ultra-wideband system evaluation for cortical implant devices , 2012, 2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society.

[8]  G. Vermeeren,et al.  In-body Path Loss Model for Homogeneous Human Tissues , 2012, IEEE Transactions on Electromagnetic Compatibility.

[9]  Qiong Wang,et al.  Channel modeling and BER performance for wearable and implant UWB body area links on chest , 2009, 2009 IEEE International Conference on Ultra-Wideband.

[10]  Eric Chow,et al.  Implantable RF Medical Devices: The Benefits of High-Speed Communication and Much Greater Communication Distances in Biomedical Applications , 2013, IEEE Microwave Magazine.

[11]  I Balasingham,et al.  On ultra wideband channel modeling for in-body communications , 2010, IEEE 5th International Symposium on Wireless Pervasive Computing 2010.

[12]  Balwant Godara,et al.  UWB for in-body medical implants: A viable option , 2010, 2010 IEEE International Conference on Ultra-Wideband.

[13]  Yang Hao,et al.  The effect of various human body tissue models on radiowave propagation from a bladder implanted wireless source , 2009, 2009 IEEE Antennas and Propagation Society International Symposium.

[14]  Cheng-Long Chuang,et al.  Magnetic Control System Targeted for Capsule Endoscopic Operations in the Stomach—Design, Fabrication, and in vitro and ex vivo Evaluations , 2012, IEEE Transactions on Biomedical Engineering.

[15]  Guolin Li,et al.  A Low-Power Digital IC Design Inside the Wireless Endoscopic Capsule , 2006, IEEE Journal of Solid-State Circuits.

[16]  William G. Scanlon,et al.  Radiowave propagation from a tissue-implanted source at 418 MHz and 916.5 MHz , 2000, IEEE Transactions on Biomedical Engineering.

[17]  Martha E. Pollack,et al.  Intelligent Technology for an Aging Population: The Use of AI to Assist Elders with Cognitive Impairment , 2005, AI Mag..

[18]  Ilangko Balasingham,et al.  An ultra wideband communication channel model for capsule endoscopy , 2010, 2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010).

[19]  H. S. Osborne,et al.  The international electrotechnical commission , 1953, Electrical Engineering.

[20]  Robert Puers,et al.  Design of a 2 Mbps FSK near-field transmitter for wireless capsule endoscopy , 2009 .

[21]  Qiong Wang,et al.  Channel modeling and BER performance of an implant UWB body area link , 2009, 2009 2nd International Symposium on Applied Sciences in Biomedical and Communication Technologies.

[22]  A. K. Skrivervik,et al.  Design, Realization and Measurements of a Miniature Antenna for Implantable Wireless Communication Systems , 2011, IEEE Transactions on Antennas and Propagation.

[23]  K. Kinsella,et al.  Global aging : the challenge of success , 2005 .

[24]  Luc Martens,et al.  Extraction of antenna gain from path loss model for in-body communication , 2011 .

[25]  Nikolaos G. Bourbakis,et al.  Three-Dimensional Reconstruction of the Digestive Wall in Capsule Endoscopy Videos Using Elastic Video Interpolation , 2011, IEEE Transactions on Medical Imaging.

[26]  Max Q.-H. Meng,et al.  3D reconstruction of the WCE images by affine SIFT method , 2011, 2011 9th World Congress on Intelligent Control and Automation.

[27]  Ilangko Balasingham,et al.  Improving in‐body ultra wideband communication using near‐field coupling of the implanted antenna , 2009 .

[28]  L. Vallozzi,et al.  Wireless Communication for Firefighters Using Dual-Polarized Textile Antennas Integrated in Their Garment , 2010, IEEE Transactions on Antennas and Propagation.

[29]  Y. Hao,et al.  Modeling and Characterization of Biotelemetric Radio Channel From Ingested Implants Considering Organ Contents , 2009, IEEE Transactions on Antennas and Propagation.

[30]  Jingjing Shi,et al.  Diversity performance of UWB low band communication over in-body to on-body propagation channel , 2012, 2012 6th European Conference on Antennas and Propagation (EUCAP).

[31]  K.-L. Wu,et al.  Experimental Study of Radiation Efficiency from an Ingested Source inside a Human Body Model* , 2005, 2005 IEEE Engineering in Medicine and Biology 27th Annual Conference.

[32]  Siavash M. Alamouti,et al.  A simple transmit diversity technique for wireless communications , 1998, IEEE J. Sel. Areas Commun..

[33]  H. Rogier,et al.  On-Body Wearable Repeater as a Data Link Relay for In-Body Wireless Implants , 2012, IEEE Antennas and Wireless Propagation Letters.

[34]  Yongxin Zhu,et al.  Design and Implementation of a High Resolution Localization System for In-Vivo Capsule Endoscopy , 2009, 2009 Eighth IEEE International Conference on Dependable, Autonomic and Secure Computing.

[35]  Michael Talcott,et al.  Magnetically Controllable Gastrointestinal Steering of Video Capsules , 2011, IEEE Transactions on Biomedical Engineering.

[36]  Balwant Godara,et al.  Ultra Wideband for in and on-body medical implants: A study of the limits and new opportunities , 2011, Proceedings of the 5th European Conference on Antennas and Propagation (EUCAP).

[37]  P. Swain,et al.  Wireless capsule endoscopy. , 2002, The Israel Medical Association journal : IMAJ.

[38]  P. Dario,et al.  Capsule Endoscopy: From Current Achievements to Open Challenges , 2011, IEEE Reviews in Biomedical Engineering.