Design of a pulse-triggered four-channel functional electrical stimulator using complementary current source and time
Summary
This study introduces a compact, cost-effective four-channel functional electrical stimulator (FES) for research. The device offers precise, high-voltage stimulation, enhancing FES applications.
Area of Science:
- Biomedical Engineering
- Neuroscience
- Electrical Engineering
Background:
- Functional electrical stimulation (FES) research requires advanced, precise stimulators.
- Existing FES devices can be bulky and expensive, limiting accessibility.
- Need for improved channel isolation and voltage control in FES systems.
Purpose of the Study:
- To propose a novel four-channel pulse-triggered functional electrical stimulator.
- To enhance FES research and applications through a compact and cost-effective design.
- To achieve high-voltage compliance and precise current control.
Main Methods:
- Utilized a complementary current source for high voltage compliance and output impedance.
- Implemented a time division output method with a MAX14803 analog switch and FIFO algorithm.
- Designed a compact stimulating core circuit with dimensions of 30 × 50 mm².
Main Results:
- Achieved four-channel charge-balanced biphasic stimulation.
- Provided a current range from 0 to 60 mA.
- Enabled single-phase pulse amplitude up to 60 V with high channel isolation.
Conclusions:
- The proposed FES device is compact, cost-effective, and offers high performance.
- The design facilitates advanced research and broader application of FES.
- The complementary current source and time division multiplexing are effective strategies for FES design.
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