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Updated: May 14, 2026

Bioelectric Analyses of an Osseointegrated Intelligent Implant Design System for Amputees

Bioelectric Analyses of an Osseointegrated Intelligent Implant Design System for Amputees

Published on: July 15, 2009

A feed-forward controlled AC-DC boost converter for biomedical implants.

Hao Jiang¹, Di Lan, Dahsien Lin

¹School of Engineering, San Francisco State University, San Francisco, CA, USA. jianghao@sfsu.edu

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

|February 1, 2013

Summary

This summary is machine-generated.

This study presents a novel feed-forward controlled converter for wireless power transfer in biomedical implants. It efficiently rectifies low-amplitude AC power and boosts it to a usable DC voltage, enabling smaller implant designs.

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Area of Science:

Biomedical Engineering
Electrical Engineering
Power Electronics

Background:

Miniaturization of biomedical implants is crucial for clinical usability.
Wireless power transfer (WPT) is key to reducing implant battery size or eliminating batteries.
Traditional radio-frequency (RF) inductive coupling for WPT requires high induced voltage, often necessitating large receiving coils.

Purpose of the Study:

To develop an innovative WPT system for miniaturized biomedical implants.
To overcome the limitations of traditional RF WPT, particularly the need for large receiving coils.
To demonstrate a novel AC to DC boost converter capable of rectifying low-amplitude AC power and boosting the output voltage.

Main Methods:

Utilized a rotating magnets-based WPT system operating at a lower frequency (around 100 Hz).
Developed a feed-forward controlled AC to DC boost converter.
Integrated rectification of AC power (500 mV) below the rectifier's turn-on voltage (1.44 V) with DC voltage boosting to 5 V.

Main Results:

Successfully rectified AC power with amplitude below the rectifier's turn-on voltage.
Achieved a stable boosted DC output voltage of 5 V, selectable within a range.
Demonstrated a standard deviation of output DC voltage less than 2.1% and load regulation of 0.4 V/kΩ.
Estimated conversion efficiency reached 75% (excluding control circuit power consumption).

Conclusions:

The developed converter enables efficient wireless power transfer for biomedical implants.
This technology has the potential to significantly reduce the size of the receiving coil.
The system provides a desirable DC output voltage for powering miniaturized medical devices.