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Full-duplex enabled wireless power transfer system via textile for miniaturized IMD.

Jaeho Lee1, Beomjun Bae2, Beomjin Kim2

  • 1Department of Electronic Engineering, Hanyang University, Seoul, 04763 South Korea.

Biomedical Engineering Letters
|July 25, 2022
PubMed
Summary

This study presents a textile-based wireless power transfer system for miniaturized implantable medical devices (IMDs). The battery-free system enables efficient wireless power and data transmission, overcoming range limitations of near-field communication.

Keywords:
Conductive threadData telemetryDual-bandFull duplexImplantable medical deviceNear-field-communication methodRadio frequency technologyTextile coilWireless power transfer

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Area of Science:

  • Biomedical Engineering
  • Wireless Communication
  • Materials Science

Background:

  • Implantable medical devices (IMDs) often require bulky batteries or energy harvesters, limiting miniaturization.
  • Traditional wireless power transfer (WPT) methods have limitations in range and efficiency.
  • Near-field communication (NFC) offers battery-free operation but suffers from a very limited effective range.

Purpose of the Study:

  • To develop a full-duplex (FD) enabled WPT system using textile for miniaturized IMDs.
  • To enable battery-free wireless power and data transmission for IMDs.
  • To overcome the range limitations of NFC and achieve simultaneous bidirectional data transmission.

Main Methods:

  • Utilized a textile medium for wireless power and data transmission.
  • Implemented a battery-free near-field communication (NFC) approach.
  • Designed a system with an external transmitter and a miniaturized IMD receiver supporting full-duplex communication.

Main Results:

  • Achieved simultaneous bidirectional data transmission at 200 kbps (downlink) and 50 kbps (uplink) with low bit error rates.
  • Demonstrated a power transfer efficiency (PTE) of 5.77%.
  • Delivered 64 mW DC-to-DC power to the load (PDL) at a distance of 0.5 cm vertically and 60 cm horizontally.

Conclusions:

  • The proposed textile-based FD-WPT system successfully enables miniaturized, battery-free IMDs.
  • The system overcomes NFC range limitations and facilitates efficient wireless power and data transfer.
  • This technology holds promise for advancing the development of smaller and more capable implantable medical devices.