A flexible super-capacitive solid-state power supply for miniature implantable medical devices

Chuizhou Meng, Oren Zaak Gall, Pedro P. Irazoqui

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We present a high-energy local power supply based on a flexible and solid-state supercapacitor for miniature wireless implantable medical devices. Wireless radio-frequency (RF) powering recharges the supercapacitor through an antenna with an RF rectifier. A power management circuit for the super-capacitive system includes a boost converter to increase the breakdown voltage required for powering device circuits, and a parallel conventional capacitor as an intermediate power source to deliver current spikes during high current transients (e.g., wireless data transmission). The supercapacitor has an extremely high area capacitance of ~1.3 mF/mm2, and is in the novel form of a 100 μm-thick thin film with the merit of mechanical flexibility and a tailorable size down to 1 mm2 to meet various clinical dimension requirements. We experimentally demonstrate that after fully recharging the capacitor with an external RF powering source, the supercapacitor-based local power supply runs a full system for electromyogram (EMG) recording that consumes ~670 μW with wireless-data-transmission functionality for a period of ~1 s in the absence of additional RF powering. Since the quality of wireless powering for implantable devices is sensitive to the position of those devices within the RF electromagnetic field, this high-energy local power supply plays a crucial role in providing continuous and reliable power for medical device operations.

Original languageEnglish (US)
Pages (from-to)973-983
Number of pages11
JournalBiomedical Microdevices
Volume15
Issue number6
DOIs
StatePublished - Dec 1 2013

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Electric Power Supplies
Radio
Equipment and Supplies
Electromagnetic Fields
Electromyography
Data communication systems
Capacitors
Networks (circuits)
Electric breakdown
Thick films
Electromagnetic fields
Capacitance
Antennas

All Science Journal Classification (ASJC) codes

  • Biomedical Engineering
  • Molecular Biology

Cite this

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abstract = "We present a high-energy local power supply based on a flexible and solid-state supercapacitor for miniature wireless implantable medical devices. Wireless radio-frequency (RF) powering recharges the supercapacitor through an antenna with an RF rectifier. A power management circuit for the super-capacitive system includes a boost converter to increase the breakdown voltage required for powering device circuits, and a parallel conventional capacitor as an intermediate power source to deliver current spikes during high current transients (e.g., wireless data transmission). The supercapacitor has an extremely high area capacitance of ~1.3 mF/mm2, and is in the novel form of a 100 μm-thick thin film with the merit of mechanical flexibility and a tailorable size down to 1 mm2 to meet various clinical dimension requirements. We experimentally demonstrate that after fully recharging the capacitor with an external RF powering source, the supercapacitor-based local power supply runs a full system for electromyogram (EMG) recording that consumes ~670 μW with wireless-data-transmission functionality for a period of ~1 s in the absence of additional RF powering. Since the quality of wireless powering for implantable devices is sensitive to the position of those devices within the RF electromagnetic field, this high-energy local power supply plays a crucial role in providing continuous and reliable power for medical device operations.",
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A flexible super-capacitive solid-state power supply for miniature implantable medical devices. / Meng, Chuizhou; Gall, Oren Zaak; Irazoqui, Pedro P.

In: Biomedical Microdevices, Vol. 15, No. 6, 01.12.2013, p. 973-983.

Research output: Contribution to journalArticle

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