Stentenna: a micromachined antenna stent for wireless monitoring of implantable microsensors

TitleStentenna: a micromachined antenna stent for wireless monitoring of implantable microsensors
Publication TypeConference Paper
Year of Publication2003
AuthorsTakahata, K., A. DeHennis, K. D. Wise, and Y. B. Gianchandani
Conference NameEngineering in Medicine and Biology Society, 2003. Proceedings of the 25th Annual International Conference of the IEEE
Pagination3360 - 3363 Vol.4
Date Publishedsep.
Keywords0.5 mm, 1.2 mm, 1.4 mm, 3.5 mm, 4 mm, 50 micron, antenna stent, antennas, biomedical telemetry, blood pressure, capacitive pressure microsensor, electrical characteristic, foils, implantable microsensors, LC tank, liquid environment, micro electro-discharge machining, micromachining, microsensors, plastic deformation, prosthetics, resonant electrical loading, stainless steel, stainless steel foil, stentenna, telemetry, wireless monitoring

This paper reports on a micromachined stent that has been developed to serve as an antenna for wireless monitoring of implantable microsensors. A 4 mm long, 3.5 mm diameter design is fabricated from 50 mu;m thick stainless steel foil using a batch-compatible micro electro-discharge machining process. As it is expanded during deployment, the stent transforms from a mesh that fits snugly around the angioplasty balloon into an inductive coil. This is accomplished by strategically located breakable links which change its electrical characteristics during the plastic deformation into its final shape. This 20 nH coil is coupled to a capacitive pressure microsensor that is approximately 1.2 times;4 times;0.5 mm3 in dimensions. Wireless monitoring is demonstrated by showing that the resonant electrical loading provided by this LC tank to a separate transmitting coil shifts by 400 KHz over a pressure change of 800 Torr. The tests are performed in a liquid environment.


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