New controller for functional electrical stimulation systems

Area of Science:

• Biomedical Engineering
• Rehabilitation Engineering

Background:

• Developing advanced controllers for functional electrical stimulation (FES) is crucial for restoring complex motor functions in individuals with disabilities.
• Existing FES systems often lack versatility and ease of use, limiting their application in restoring functions like walking, standing, and grasping.

Observation:

• A novel, self-contained controller was designed for FES systems, capable of regulating up to 16 channels and supporting diverse sensory inputs.
• The controller features a user-friendly PC interface, memory for sensory data, and five timers for multi-modal movement control.
• A case study demonstrated the controller's effectiveness in restoring walking for a paraplegic subject using surface electrodes and a rule-based control algorithm.

Findings:

• The designed controller successfully regulated stimulation parameters (frequency, pulse duration, charge balance) for complex movements.
• The implemented FES system, including the novel controller, enabled a paraplegic subject to walk faster and with reduced physiological effort compared to hand control.
• The system integrated various sensors (goniometers, force-sensing resistors, accelerometers) for effective sensory-driven control.

Implications:

• This novel controller offers a versatile and user-friendly solution for FES systems, potentially improving the quality of life for individuals with motor impairments.
• The successful application in restoring walking highlights the potential of advanced FES control strategies for complex motor rehabilitation.
• Further research and application of this controller could lead to broader restoration of motor functions, enhancing independence and mobility.