A semi-active hybrid neuroprosthesis for restoring lower limb function in paraplegics

Area of Science:

• Biomedical Engineering
• Neuroprosthetics
• Rehabilitation Robotics

Background:

• Functional electrical stimulation (FES) enables paraplegia individuals to regain walking function.
• Muscle fatigue limits walking duration with FES-based neuroprostheses.
• Hybrid systems combining FES and active orthoses can compensate for fatigue.

Purpose of the Study:

• To demonstrate initial testing of a novel semi-active hybrid walking neuroprosthesis.
• To evaluate the functionality of the Semi-Active Hybrid Orthosis (SEAHO).
• To assess the integration of FES and powered hip assistance for enhanced mobility.

Main Methods:

• Development and testing of the Semi-Active Hybrid Orthosis (SEAHO).
• SEAHO utilizes electric hip motors for flexion/extension and FES for knee/foot actuation.
• A finite state machine with a nonlinear controller manages SEAHO operation based on hip angle cues.

Main Results:

• Initial testing of the SEAHO demonstrated its capability to support users during standing and walking phases.
• The hybrid system effectively integrated FES and powered hip assistance.
• The control system successfully managed hip motor position and FES actuation.

Conclusions:

• The semi-active hybrid walking neuroprosthesis shows promise in extending walking duration for individuals with paraplegia.
• SEAHO represents a viable approach to overcome FES-induced muscle fatigue.
• Further research and development are warranted to optimize this neuroprosthetic system.