A Batteryless Energy Harvesting Storage System for Implantable Medical Devices Demonstrated In Situ

Oren Z. Gall, Chuizhou Meng, Hansraj Bhamra, Henry Mei, Simon W.M. John, Pedro P. Irazoqui

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

We report a wireless energy harvesting and telemetry storage system in 180 nm CMOS technology, demonstrated in situ in rat carcass. The implantable device has dimensions 13 mm × 15 mm and stores 87.5 mJ, providing a self-powering time of 8.5 s transmitting through tissue. We utilize an all-solid-state flexible supercapacitor of breakdown voltage 0.8 V and capacitance 400 mF to harvest incoming wireless power, followed by a boost converter CMOS that drives an active wireless transmitter at 1.5 V at 2.4 GHz in the industrial, scientific, and medical (ISM) band. The DC/DC converter component and switching frequency selection were guided by genetic algorithm analysis and use digital feedback to control the pulse width modulation (PWM), which slowly modifies the duty cycle to control output voltage fluctuations. This implantable medical device system presents the roadmap for batteryless energy harvesting in vivo and in clinical environments, exhibiting the highest operating storage density of 450 μJ/mm 2 reported to date.

Original languageEnglish (US)
Pages (from-to)1360-1373
Number of pages14
JournalCircuits, Systems, and Signal Processing
Volume38
Issue number3
DOIs
StatePublished - Mar 15 2019

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Applied Mathematics

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