Integrated Electromagnetic Wireless Power Harvesting System for mm-size Biomedical Implants

[摘要] Rising demand for continuous monitoring of human body and healthcare devices in recent years has resulted in the development of implantablebiopotential sensors. Infection risks and mobility concerns constrain theimplanted sensors to operate without any transcutaneous wire connectionwhich raises serious challenges for powering and data telemetry. Lack ofenough information on many physiological processes such as human speechproduction dynamics has hindered research on bases of the processes andit mainly stems from available measurement systems limitations.In this work, we use electromagnetic waves in GHz frequency rangeto transfer the required power to the implanted system. The optimumfrequency for wireless power transfer is studied as a function of transmittingand receiving antennas as well as the dispersive characteristics ofthe biological tissues. We present two types of power harvesting platformwith on-chip antennas that can be integrated on a silicon chip. The secondpower harvesting system is designed to have a long-range operating rangeand harvests electrical energy from a far-field electromagnetic source andcan be exploited to power up ultra-low power biomedical implants. Thesecond system is designed to increase the functionality of a complex implantsuch as a neural recording system. While maintaining the losses inbiological tissues below Specific Absorption Rate (SAR) limit, the harvestingsystem can provide milliwatts of power the operation of a highperformance fully integrated biomedical implant.

[发布机构] Rice University

[效力级别] power