Abstract

We present a battery-free radio frequency (RF) microwave activated wireless stimulator, 25 × 42 × 1.6 mm3 on a flexible substrate, featuring high current delivery, up to 60 mA, to stimulate engineered cardiac tissues. An external antenna shines 2.4 GHz microwave, which is modulated by an inverted pulse to directly control the stimulating waveform, to the wireless passive stimulator. The stimulator is equipped with an on-board antenna, multistage diode multipliers, and a control transistor. Rat cardiomyocytes, seeded on electrically conductive gelatin-based hydrogels, demonstrate synchronous contractions and Ca2+ transients immediately upon stimulation. Notably, the stimulator output voltage and current profiles match the tissue contraction frequency within 0.5-2 Hz. Overall, our results indicate the promising potential of the proposed wireless passive stimulator for cardiac stimulation and therapy by induction of precisely controlled and synchronous contractions.

Original languageEnglish (US)
Pages (from-to)1006-1012
Number of pages7
JournalACS Sensors
Volume2
Issue number7
DOIs
StatePublished - Jul 28 2017

Fingerprint

stimulation
contraction
Tissue
antennas
microwaves
gelatins
multipliers
Antennas
rats
Hydrogels
high current
electric batteries
therapy
delivery
Microwave frequencies
radio frequencies
induction
waveforms
transistors
Gelatin

Keywords

  • Cardiac tissue
  • Contraction
  • Implant
  • Passive
  • Wireless stimulator

ASJC Scopus subject areas

  • Bioengineering
  • Fluid Flow and Transfer Processes
  • Process Chemistry and Technology
  • Instrumentation

Cite this

Wireless passive stimulation of engineered cardiac tissues. / Liu, Shiyi; Navaei, Ali; Meng, Xueling; Nikkhah, Mehdi; Chae, Junseok.

In: ACS Sensors, Vol. 2, No. 7, 28.07.2017, p. 1006-1012.

Research output: Contribution to journalArticle

Liu, Shiyi ; Navaei, Ali ; Meng, Xueling ; Nikkhah, Mehdi ; Chae, Junseok. / Wireless passive stimulation of engineered cardiac tissues. In: ACS Sensors. 2017 ; Vol. 2, No. 7. pp. 1006-1012.
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