Somatotopically Evoked Tactile Sensation via Transcutaneous Electrical Nerve Stimulation Improves Prosthetic
Summary
This study introduces a non-invasive sensory interface for prosthetic hands, enabling users with forearm amputation to feel object properties like length and compliance through evoked tactile sensation (ETS). This technology significantly improves prosthetic control and sensory feedback.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Rehabilitation Science
Background:
- Effective use of hand prostheses relies on sensory feedback.
- Non-invasive neural interfaces offer limited sensory information transfer.
- Restoring tactile sensation is crucial for prosthetic users.
Purpose of the Study:
- To investigate a novel non-invasive sensory feedback system for prosthetic hands.
- To enable evoked tactile sensation (ETS) in the projected finger map (PFM) of amputees.
- To assess the impact of ETS on object manipulation and identification.
Main Methods:
- Developed a bidirectional prosthetic interface integrating an ETS system with a commercial prosthetic hand.
- Encoded pressure information via pulse width modulation of buzz sensation.
- Evaluated performance in grasp-and-transport and transport-and-identification tasks.
Main Results:
- Participants with forearm amputation could identify object length and compliance using simultaneous multi-digit ETS.
- ETS improved grasp-and-transport performance for both experienced and novice prosthetic users.
- Enhanced object size and compliance classification accuracy with ETS feedback.
Conclusions:
- Evoked tactile sensation (ETS) efficiently communicates somatotopically compatible information non-invasively.
- The developed system improves sensory discrimination and closed-loop prosthetic control.
- This non-invasive interface offers a viable solution for restoring sensory feedback in prosthetic users, particularly those experiencing PFM.
