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Towards a Miniaturized 3D Receiver WPT System for Capsule Endoscopy.
Sadeque Reza Khan1, Marc P Y Desmulliez2
1Institute of Sensors, Signals and Systems, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, Scotland, UK. srk5@hw.ac.uk.
Micromachines
|August 21, 2019
Summary
This study presents a miniaturized wireless power transfer system for capsule endoscopy. The system achieves efficient power delivery while ensuring patient safety through low specific absorption rate and minimal temperature increase.
Area of Science:
- Biomedical Engineering
- Wireless Power Transfer
- Medical Devices
Background:
- Capsule endoscopy requires untethered power solutions.
- Existing wireless power transfer (WPT) systems face challenges in miniaturization and efficiency for endoscopic applications.
Purpose of the Study:
- To develop and characterize a miniaturized 3D wireless power transfer (WPT) system for capsule endoscopy (CE).
- To ensure the system's efficiency, portability, and patient safety within biological tissues.
Main Methods:
- Designed and manufactured a flexible, multi-transmitter (multi-TX) array with printed spiral coils.
- Developed a miniaturized 3D receiver (RX) incorporating a ferrite rod for enhanced power transfer efficiency (PTE).
- Utilized a custom high-efficiency dual class-E power amplifier and simulated specific absorption rate (SAR) using HFSS software.
Main Results:
- Achieved a link and system PTE of 1% and 0.7% respectively within phantom tissue.
- Simulated SAR of 0.66 W/kg at 1 MHz, adhering to IEEE safety guidelines.
- Measured a maximum temperature increase of 1.9 °C, demonstrating tissue safety.
Conclusions:
- The developed miniaturized 3D WPT system is suitable for capsule endoscopy applications.
- The system demonstrates efficient power transfer and meets critical safety standards for patient use.
- This technology offers a promising solution for untethered endoscopic procedures.
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