An Inductively Powered Implantable Blood Flow Sensor Microsystem for Vascular Grafts

Monitoring blood flow rate inside prosthetic vascular grafts enables early detection of graft degradation for timely intervention. This paper describes a wireless implantable microsystem, which senses and transmits blood flow rate to an external device for convenient monitoring. The microsystem consists of an ultra-low power CMOS application specific integrated circuit (ASIC) containing a complete set of essential electronics occupying 1.5 x 1.78 mm2 active area. The microsystem has successfully demonstrated 0.176mm Hg/Hz, which surpassed the expected sensitivity required of the targeted application.

Reference:
Jia Hao Cheong et. al., “An inductively Powered Implantable Blood Flow Sensor Microsystem for Vascular Grafts”, IEEE Transactions on Biomedical Engineering, Vol 59, Iss. 9, Pg 2466-2475, 2012