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Breathing-controlled Electrical Stimulation (BreEStim) for Management of Neuropathic Pain and Spasticity

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Published on: January 10, 2013

Current stimulator IC with adaptive supply regulator for visual prostheses.

Hyoungho Ko¹, Sang-Min Lee, Jae-Hyun Ahn

¹Department of Electronics, Chungnam National University, Daejeon 305-764, Korea.

Journal of Biomedical Nanotechnology

|July 18, 2013

Summary

This summary is machine-generated.

This study introduces a novel integrated circuit current stimulator with an adaptive supply regulator for visual prostheses. This design minimizes supply voltage, reducing tissue damage and improving stimulation accuracy for functional electrical stimulation (FES).

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Area of Science:

Biomedical Engineering
Electrical Engineering
Neuroscience

Background:

Current stimulation is preferred for visual prostheses using functional electrical stimulation (FES) due to precise charge control.
Existing current stimulators require high static supply voltages, risking tissue damage and electrode degradation.
High voltage (HV) stimulation poses a significant risk in implantable medical devices.

Purpose of the Study:

To propose a novel integrated circuit (IC) current stimulator with an adaptive supply regulator (ASR).
To minimize the internal supply voltage, thereby reducing potential tissue damage.
To enhance output current accuracy and robustness against varying load impedances.

Main Methods:

Developed an IC current stimulator incorporating an adaptive supply regulator (ASR).
The ASR dynamically adjusts the internal power supply voltage to the minimum required level for stimulation.
A current feedback loop within the ASR monitors and regulates the output current by adjusting the supply voltage.

Main Results:

The ASR successfully minimized the internal supply voltage, mitigating risks associated with high voltage stimulation.
The current feedback loop demonstrated enhanced accuracy and robustness of the output current against load impedance variations.
The stimulator IC was fabricated using a 0.35 micro m bipolar-CMOS-DMOS (BCDMOS) process.

Conclusions:

The proposed ASR-integrated current stimulator offers a safer and more accurate alternative for FES-based visual prostheses.
Adaptive voltage regulation significantly reduces the potential for tissue damage and electrode damage.
This novel design improves the reliability and performance of current stimulation in biomedical applications.