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Subcutaneous power supply by NIR-II light.

Shanzhi Lyu1,2, Yonglin He1, Xinglei Tao1

  • 1Key Laboratory of Advanced Light Conversion Materials and Biophotonics, Department of Chemistry, Renmin University of China, 100872, Beijing, China.

Nature Communications
|November 4, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel photo-thermal-electric converter for contactless recharging of implantable medical devices. This device utilizes second near-infrared (NIR-II) light for efficient deep-tissue power delivery, enabling real-time data transfer from internal devices.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Optoelectronics

Background:

  • Contactless recharging is crucial for implantable medical devices, avoiding invasive procedures.
  • Second near-infrared (NIR-II) light offers superior subcutaneous power transmission but faces utilization challenges.
  • Existing power transfer methods have limitations in depth penetration and efficiency.

Purpose of the Study:

  • To develop an efficient contactless power transfer system for implantable devices using NIR-II light.
  • To create a photo-thermal-electric converter capable of deep-tissue power generation.
  • To demonstrate the feasibility of real-time data transmission from implanted devices.

Main Methods:

  • A novel photo-thermal-electric converter was designed by combining photothermal and thermoelectric conversion principles.
  • The converter's performance was evaluated under excised tissue to assess subcutaneous power transmission.
  • An in vivo experiment was conducted using a rabbit model to demonstrate deep-tissue power generation and device recharging.

Main Results:

  • The photo-thermal-electric converter achieved an output power of 195 mW under excised tissues.
  • The device demonstrated non-invasive operation with negligible biological damage and deep tissue penetration.
  • An in vivo test yielded 20 mW output power through 8.5 mm of rabbit skin, sufficient for a high-power wireless camera.

Conclusions:

  • The developed photo-thermal-electric converter effectively utilizes NIR-II light for contactless power transfer to deep-seated implants.
  • This technology offers a promising solution for recharging implantable medical devices and enabling real-time data transmission.
  • The system presents advantages of high output power, deep penetration, and minimal invasiveness for advanced medical applications.