Wireless RF communication in biomedical applications

doi:10.1088/0964-1726/17/1/015050

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Inke Jones et al 2008 Smart Mater. Struct. 17 015050 doi:10.1088/0964-1726/17/1/015050

Wireless RF communication in biomedical applications

Inke Jones^1,2,3, Lucas Ricciardi^1,2, Leonard Hall^1,2, Hedley Hansen⁴, Vijay Varadan⁵, Chris Bertram⁶, Simon Maddocks⁷, Stefan Enderling^1,2,8, David Saint^1,9, Said Al-Sarawi^1,2 and Derek Abbott^1,2

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ijones@eleceng.adelaide.edu.au dabbott@eleceng.adelaide.edu.au

¹ Centre of Biomedical Engineering, University of Adelaide, SA 5005, Australia
² Department of Electrical and Electronic Engineering, University of Adelaide, SA 5005, Australia
³ Department of Biomedical Engineering, University of Applied Sciences, D-45877 Gelsenkirchen, Germany
⁴ DSTO, EWD, PO Box 1500, Edinburgh, SA 5111, Australia
⁵ Research Center for the Engineering of Electronic and Acoustic Materials, Pennsylvania State University, University Park, PA 16802, USA
⁶ Graduate School of Biomedical Engineering, University of New South Wales, NSW 2052, Australia
⁷ Department of Animal Science, University of Adelaide, Roseworthy Campus, Roseworthy, SA 5371, Australia
⁸ Department of Electronics and Electrical Engineering, University of Edinburgh, Edinburgh EH9 3JF, UK
⁹ Department of Physiology, University of Adelaide, SA 5005, Australia

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Abstract References Cited By

This paper focuses on wireless transcutaneous RF communication in biomedical applications. It discusses current technology, restrictions and applications and also illustrates possible future developments. It focuses on the application in biotelemetry where the system consists of a transmitter and a receiver with a transmission link in between. The transmitted information can either be a biopotential or a nonelectric value like arterial pressure, respiration, body temperature or pH value. In this paper the use of radio-frequency (RF) communication and identification for those applications is described. Basically, radio-frequency identification or RFID is a technology that is analogous to the working principle of magnetic barcode systems. Unlike magnetic barcodes, passive RFID can be used in extreme climatic conditions—also the tags do not need to be within close proximity of the reader. Our proposed solution is to exploit an exciting new development in making circuits on polymers without the need for battery power. This solution exploits the principle of a surface acoustic wave (SAW) device on a polymer substrate. The SAW device is a set of interdigitated conducting fingers on the polymer substrate. If an appropriate RF signal is sent to the device, the fingers act as microantennas that pick up the signal, and this energy is then converted into acoustic waves that travel across the surface of the polymer substrate. Being a flexible polymer, the acoustic waves cause stresses that can either contract or stretch the material. In our case we mainly focus on an RF controllable microvalve that could ultimately be used for fertility control.

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