A modified magnetic resonance wireless power transfer system for capsule endoscopy

Area of Science:

• Biomedical Engineering
• Electrical Engineering
• Medical Devices

Background:

• Conventional wireless power transfer (WPT) for capsule endoscopy uses cumbersome cylindrical coils.
• Existing methods limit internal space within the capsule for essential components like sensors.
• There is a need for more convenient and efficient WPT solutions for ingestible devices.

Purpose of the Study:

• To develop a fully planar wireless power transfer (WPT) scheme for capsule endoscopy.
• To enhance the convenience of WPT implementation for patients.
• To optimize internal capsule space for additional components.

Main Methods:

• Implementation of a fully planar WPT system.
• Utilization of a two-layer printed coil for both transmitter and receiver.
• Excitation of the transmitter power coil at 13.56 MHz.
• Simulation and measurement of body tissue effects on power efficiency.

Main Results:

• Achieved a power efficiency increase of over 2% with the proposed planar structure.
• Evaluated the impact of body tissue on power efficiency.
• Determined the maximum specific absorption rate (SAR) for the system.

Conclusions:

• The developed planar WPT system meets the required medical standards.
• The system offers a more convenient and space-efficient solution for capsule endoscopy.
• The findings support the clinical viability of the proposed WPT technology.