Performance Evaluation of Magnetic Resonance Coupling Method for Intra-Body Network (IBNet)

Area of Science:

• Biomedical Engineering
• Medical Devices
• Wireless Communication

Background:

• Emerging medical devices necessitate effective intra-body communication (IBNet) for enhanced healthcare insights.
• Human body communication (HBC) is a growing field with significant potential for medical applications.
• Existing communication methods for intra-body networks face limitations in efficiency and reliability.

Purpose of the Study:

• To investigate magnetic resonance (MR) coupling as a viable technology for intra-body networks (IBNet).
• To evaluate the performance of MR coupling in terms of signal transmission and path loss within biological tissues.
• To assess the feasibility of MR coupling for multi-nodal communication, sensing, and powering of wearable and implantable devices.

Main Methods:

• Experimental evaluation of MR coupling for signal transmission in biological tissue.
• Measurement of path loss (PL) at various distances (up to 100 cm) and frequencies (13.56 MHz).
• Analysis of signal integrity under different angular orientations, distances, and body postures.

Main Results:

• MR coupling demonstrated effective signal transmission with a maximum path loss of PL ≤ 33 dB at 13.56 MHz over 100 cm.
• MR coupling exhibited lower path loss compared to galvanic, capacitive, and RF methods at the same distance.
• Path loss showed minor variations with angular orientation (0.19 ≤ ∆PL ≤ 0.62 dB) but significant dependency on distance (0.0547 dB/cm).
• Body postures had minimal impact on path loss (∆PL ≤ ± 0.21 dB).
• Multi-nodal MR transmission successfully supported simultaneous signal reception at -16.77 dBm loss for nodes at 60 cm and 100 cm.

Conclusions:

• MR coupling is a promising technology for establishing robust intra-body networks (IBNet).
• Its performance characteristics make it suitable for reliable communication, sensing, and powering of medical devices.
• MR coupling offers a potential advancement for the future of wearable and implantable medical technologies.