A wireless microsensor for monitoring flow and pressure in a blood vessel utilizing a dual-inductor antenna stent and two pressure sensors

TitleA wireless microsensor for monitoring flow and pressure in a blood vessel utilizing a dual-inductor antenna stent and two pressure sensors
Publication TypeConference Paper
Year of Publication2004
AuthorsTakahata, K., A. DeHennis, K. D. Wise, and Y. B. Gianchandani
Conference NameMicro Electro Mechanical Systems, 2004. 17th IEEE International Conference on. (MEMS)
Pagination216 - 219
Keywords5 to 40 MHz, angioplasty balloon, batch compatible microelectrodischarge machining, blood flow, blood pressure, blood vessel, blood vessels, capacitive sensors, dual helical coils, dual inductor antenna stent, flow monitoring, flow rate detection, haemodynamics, integrated device, LC tanks, microfluidics, micromachined antenna stent, micromachined capacitive pressure sensors, micromachining, microsensors, plastic deformation, pressure monitoring, pressure sensors, resonant impedance, silicone mock artery, silicones, thick parylene layer, wireless microsensor
Abstract

This paper reports a micromachined antenna stent (stentenna) that is integrated with implantable microsensors for wireless sensing of blood flow and pressure with no battery. A device that has 20-mm length and 3.5-mm diameter (after expansion) is fabricated from 50 mu;m thick stainless steel foil by using batch-compatible micro-electro-discharge machining. This is coupled to two micromachined capacitive pressure sensors of approximately 1.4 times;1.8 times;0.5 mm3 dimensions. A 0.5- mu;m thick parylene layer provides electrical insulation. The integrated device is deployed inside a silicone mock artery with a standard angioplasty balloon. The planar structure is plastically deformed to a tubular shape, resulting in dual helical coils with 50-60 nH each. These L-C tanks are used to wirelessly probe pressures at two points along a channel for flow-rate detection. Fluidic experiments that emulate a blockage in the mock artery demonstrate that the resonant impedance and phase provided by the LC-tanks to a separate transmitting coil shift by 5-40 MHz over flow-rate change of 150-300 mL/min. Pressure sensitivity is 273 ppm/Torr, which is >100 times; higher than past results.

URLhttp://dx.doi.org/10.1109/MEMS.2004.1290561
DOI10.1109/MEMS.2004.1290561

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