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Implantation and Control of Wireless, Battery-free Systems for Peripheral Nerve Interfacing
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An ultrasonically powered implantable micro-oxygen generator (IMOG).

Teimour Maleki1, Ning Cao, Seung Hyun Song

  • 1Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47906, USA. tmalekij@purdue.edu

IEEE Transactions on Bio-Medical Engineering
|August 10, 2011
PubMed
Summary

An implantable micro-oxygen generator (IMOG) uses ultrasonic power for in situ tumor oxygenation. This novel device effectively combats tumor hypoxia by generating oxygen directly within the tumor site.

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Area of Science:

  • Biomedical Engineering
  • Oncology
  • Medical Devices

Background:

  • Solid tumors often experience hypoxia, hindering cancer treatment efficacy.
  • Conventional oxygen delivery methods are limited by tumor interstitial pressure and abnormal vasculature.
  • Developing localized oxygen generation strategies is crucial for improving therapeutic outcomes.

Purpose of the Study:

  • To introduce an ultrasonically powered implantable micro-oxygen generator (IMOG) for in situ tumor oxygenation.
  • To demonstrate the feasibility of active oxygen generation independent of tumor microenvironment limitations.
  • To evaluate the performance and efficacy of IMOG in preclinical tumor models.

Main Methods:

  • Design and fabrication of a miniaturized implantable micro-oxygen generator (IMOG) measuring 1.2 mm × 1.3 mm × 8 mm.
  • Utilizing wireless 2.15 MHz ultrasonic power for deep penetration and reduced device size.
  • Conducting in vitro, ex vivo, and in vivo experiments using hypoxic pancreatic tumor models.

Main Results:

  • IMOG successfully generated over 150 μA, producing 0.525 μL/min of oxygen via water electrolysis.
  • Ultrasonic powering enabled deep tissue penetration and eliminated directional sensitivity.
  • In vivo studies demonstrated effective in situ tumor oxygenation within 10 minutes in a 1 cm³ pancreatic tumor model.

Conclusions:

  • The ultrasonically powered IMOG offers a promising solution for active, localized tumor oxygenation.
  • This technology overcomes limitations of conventional oxygen delivery in hypoxic tumors.
  • IMOG's small size and efficient oxygen generation pave the way for novel cancer therapeutic strategies.