Micromachined Antenna Stents and Cuffs for Monitoring Intraluminal Pressure and Flow

TitleMicromachined Antenna Stents and Cuffs for Monitoring Intraluminal Pressure and Flow
Publication TypeJournal Article
Year of Publication2006
AuthorsTakahata, K., Y. B. Gianchandani, and K. D. Wise
JournalMicroelectromechanical Systems, Journal of
Pagination1289 -1298
Date Publishedoct.
Keywords20 mm, 3.5 mm, 400 micron, 50 micron, 750 micron, bile ducts, biomedical telemetry, blood flow measurement, blood vessels, capacitive elements, flow monitoring, inductive antenna stent, intraluminal pressure monitoring, microelectrodischarge, micromachined antenna stents, microsensors, passive telemetry scheme, patient monitoring, resonant LC tanks, ring-shaped intraluminal cuff, silicone mock arteries, stainless steel, stainless steel microstructures, standard angioplasty balloons

This paper describes two stainless steel microstructures that are microelectrodischarge machined from 50-mum-thick planar foil for intraluminal measurements of pressure and flow (with potential for applications ranging from blood vessels to bile ducts). The first structure is an inductive antenna stent (stentenna) with 20-mm length and 3.5-mm expanded diameter. It is coupled with capacitive elements to form resonant LC tanks that can be telemetrically queried. The resulting LC tanks are deployed inside silicone mock arteries using standard angioplasty balloons and used in a passive telemetry scheme to sense changes in pressure and flow. Using water as the test fluid, the resonant peaks shift from about 215 to 208 MHz as the flow is increased from 0 to 370 mL/min. The second structure is a ring-shaped intraluminal cuff with two 400times750-mum2 electrodes that are used to provide a direct transduction of flow velocity in the presence of a magnetic field. It is fabricated in a manner similar to the stentenna, but with an insulating segment. The voltage has a linear dependence on flow rate, changing by 3.1-4.3 muV per cm/s of flow (of saline) over a 180 cm/s dynamic range, with a magnetic field of about 0.25 T


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