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Stimulation Efficiency With Decaying Exponential Waveforms in a Wirelessly Powered Switched-Capacitor Discharge Stimulation System.

Publication ,  Journal Article
Lee, H-M; Howell, B; Grill, WM; Ghovanloo, M
Published in: IEEE transactions on bio-medical engineering
May 2018

The purpose of this study was to test the feasibility of using a switched-capacitor discharge stimulation (SCDS) system for electrical stimulation, and, subsequently, determine the overall energy saved compared to a conventional stimulator. We have constructed a computational model by pairing an image-based volume conductor model of the cat head with cable models of corticospinal tract (CST) axons and quantified the theoretical stimulation efficiency of rectangular and decaying exponential waveforms, produced by conventional and SCDS systems, respectively. Subsequently, the model predictions were tested in vivo by activating axons in the posterior internal capsule and recording evoked electromyography (EMG) in the contralateral upper arm muscles. Compared to rectangular waveforms, decaying exponential waveforms with time constants >500 μs were predicted to require 2%-4% less stimulus energy to activate directly models of CST axons and 0.4%-2% less stimulus energy to evoke EMG activity in vivo. Using the calculated wireless input energy of the stimulation system and the measured stimulus energies required to evoke EMG activity, we predict that an SCDS implantable pulse generator (IPG) will require 40% less input energy than a conventional IPG to activate target neural elements. A wireless SCDS IPG that is more energy efficient than a conventional IPG will reduce the size of an implant, require that less wireless energy be transmitted through the skin, and extend the lifetime of the battery in the external power transmitter.

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Published In

IEEE transactions on bio-medical engineering

DOI

EISSN

1558-2531

ISSN

0018-9294

Publication Date

May 2018

Volume

65

Issue

5

Start / End Page

1095 / 1106

Related Subject Headings

  • Wireless Technology
  • Signal Processing, Computer-Assisted
  • Muscle, Skeletal
  • Models, Neurological
  • Male
  • Head
  • Forelimb
  • Equipment Design
  • Electromyography
  • Electrodes, Implanted
 

Citation

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MLA
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Lee, H.-M., Howell, B., Grill, W. M., & Ghovanloo, M. (2018). Stimulation Efficiency With Decaying Exponential Waveforms in a Wirelessly Powered Switched-Capacitor Discharge Stimulation System. IEEE Transactions on Bio-Medical Engineering, 65(5), 1095–1106. https://doi.org/10.1109/tbme.2017.2741107
Lee, Hyung-Min, Bryan Howell, Warren M. Grill, and Maysam Ghovanloo. “Stimulation Efficiency With Decaying Exponential Waveforms in a Wirelessly Powered Switched-Capacitor Discharge Stimulation System.IEEE Transactions on Bio-Medical Engineering 65, no. 5 (May 2018): 1095–1106. https://doi.org/10.1109/tbme.2017.2741107.
Lee H-M, Howell B, Grill WM, Ghovanloo M. Stimulation Efficiency With Decaying Exponential Waveforms in a Wirelessly Powered Switched-Capacitor Discharge Stimulation System. IEEE transactions on bio-medical engineering. 2018 May;65(5):1095–106.
Lee, Hyung-Min, et al. “Stimulation Efficiency With Decaying Exponential Waveforms in a Wirelessly Powered Switched-Capacitor Discharge Stimulation System.IEEE Transactions on Bio-Medical Engineering, vol. 65, no. 5, May 2018, pp. 1095–106. Epmc, doi:10.1109/tbme.2017.2741107.
Lee H-M, Howell B, Grill WM, Ghovanloo M. Stimulation Efficiency With Decaying Exponential Waveforms in a Wirelessly Powered Switched-Capacitor Discharge Stimulation System. IEEE transactions on bio-medical engineering. 2018 May;65(5):1095–1106.

Published In

IEEE transactions on bio-medical engineering

DOI

EISSN

1558-2531

ISSN

0018-9294

Publication Date

May 2018

Volume

65

Issue

5

Start / End Page

1095 / 1106

Related Subject Headings

  • Wireless Technology
  • Signal Processing, Computer-Assisted
  • Muscle, Skeletal
  • Models, Neurological
  • Male
  • Head
  • Forelimb
  • Equipment Design
  • Electromyography
  • Electrodes, Implanted