TY - CONF
T1 - A wirelessly powered and interrogated blood flow monitoring microsystem fully integrated with a prosthetic vascular graft for early failure detection
AU - Cheong, Jia Hao
AU - Ho, Chee Keong
AU - Ng, Simon Sheung Yan
AU - Xue, Rui Feng
AU - Cha, Hyouk Kyu
AU - Khannur, Pradeep Basappa
AU - Liu, Xin
AU - Lee, Andreas Astuti
AU - Endru, Ferguson Noviar
AU - Park, Woo Tae
AU - Lim, Li Shiah
AU - He, Cairan
AU - Je, Minkyu
PY - 2012
Y1 - 2012
N2 - This paper presents an implantable blood flow monitoring microsystem embedded in a prosthetic graft for early graft failure detection. The microsystem consists of two MEMS pressure sensors, an inductively powered wireless sensor interface ASIC, two miniature coupling coils, and a flexible cable connecting them. The implantable microsystem is powered and configured by an external monitoring device using 13.56-MHz carrier frequency. The blood flow rate information is sensed in the form of an oscillation frequency and transmitted to the external monitoring device through backscattering. The ASIC fabricated in 0.18-μm CMOS process occupies a total area of 0.5 × 3.3 mm2 including pads and consumes a total power of 12.6 μW. With the high-efficiency design of coupling coils, rectifier and LDO, the wireless power link achieves an overall power efficiency of 2% through 5-cm-thick tissue. With the ultra low power consumption and high-efficiency power transfer, the ASIC can be powered by transmitting only 630-μW RF carrier from the external device. The measured performance of the blood flow monitoring microsystem demonstrates a 0.17-psi pressure resolution.
AB - This paper presents an implantable blood flow monitoring microsystem embedded in a prosthetic graft for early graft failure detection. The microsystem consists of two MEMS pressure sensors, an inductively powered wireless sensor interface ASIC, two miniature coupling coils, and a flexible cable connecting them. The implantable microsystem is powered and configured by an external monitoring device using 13.56-MHz carrier frequency. The blood flow rate information is sensed in the form of an oscillation frequency and transmitted to the external monitoring device through backscattering. The ASIC fabricated in 0.18-μm CMOS process occupies a total area of 0.5 × 3.3 mm2 including pads and consumes a total power of 12.6 μW. With the high-efficiency design of coupling coils, rectifier and LDO, the wireless power link achieves an overall power efficiency of 2% through 5-cm-thick tissue. With the ultra low power consumption and high-efficiency power transfer, the ASIC can be powered by transmitting only 630-μW RF carrier from the external device. The measured performance of the blood flow monitoring microsystem demonstrates a 0.17-psi pressure resolution.
UR - http://www.scopus.com/inward/record.url?scp=84881079764&partnerID=8YFLogxK
U2 - 10.1109/IPEC.2012.6522654
DO - 10.1109/IPEC.2012.6522654
M3 - Paper
AN - SCOPUS:84881079764
SP - 177
EP - 180
T2 - 2012 IEEE Asian Solid-State Circuits Conference, A-SSCC 2012
Y2 - 12 November 2012 through 14 November 2012
ER -