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Design and implementation of a volume conduction based RFID system for smart implants.

Xiaoyu Liu1, Ajay Ogirala, Lee Berger

  • 1Department of Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, PA 15261, USA. xil56@pitt.edu

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|January 19, 2012
PubMed
Summary

This study introduces volume conduction to operate radio frequency identification (RFID) tags in metallic knee and hip implants. This method overcomes traditional wireless limitations, enabling reliable RFID identification for medical implants.

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Area of Science:

  • Biomedical Engineering
  • Implantable Devices
  • Radio Frequency Identification

Background:

  • Increasing popularity of knee and hip replacement surgeries necessitates implant identification.
  • Traditional wireless radio frequency identification (RFID) tags fail in metallic environments due to signal interference.
  • Metallic implants degrade RFID field strength, hindering reliable identification.

Purpose of the Study:

  • To propose and validate a novel method for operating RFID tags within metallic implants.
  • To overcome radio frequency interference challenges in metallic environments for RFID functionality.
  • To enhance the efficiency of power transmission for implantable RFID tags.

Main Methods:

  • Developed and optimized electrodes for efficient power transmission via volume conduction.
  • Designed a system to operate RFID tags using volume conduction, bypassing RF interference.
  • Conducted experiments using saline and pig skin to simulate in-body conditions.

Main Results:

  • Volume conduction demonstrated significantly less signal attenuation compared to wireless methods in metallic environments.
  • Optimized electrodes improved power transmission efficiency for RFID tags in a knee implant model.
  • Successful reading of an implanted RFID tag through pig skin confirmed the method's effectiveness.

Conclusions:

  • Volume conduction is an effective method for operating RFID tags embedded in metallic implants.
  • This technique overcomes the limitations of wireless RFID in the presence of metallic interference.
  • The proposed method offers a reliable solution for identifying medical implants.