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On prosthetic control: A regenerative agonist-antagonist myoneural interface
S S Srinivasan1,2, M J Carty2,3, P W Calvaresi2
1Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Science Robotics
|November 7, 2020
Summary
This study introduces an agonist-antagonist myoneural interface (AMI) for amputations, restoring nerve targets and muscle functions. The AMI enables robust prosthetic control and provides crucial sensory feedback for improved limb sensation.
Area of Science:
- Biomedical Engineering
- Regenerative Medicine
- Neuroprosthetics
Background:
- Current amputation procedures hinder prosthetic control by causing nerve damage and eliminating natural muscle feedback.
- Lack of proper neural targets leads to neuromas and prevents effective signal recording for prosthetics.
- Severed agonist-antagonist muscle relationships prevent the generation of essential proprioceptive feedback.
Purpose of the Study:
- To develop a novel surgical technique, the agonist-antagonist myoneural interface (AMI), to improve prosthetic limb control.
- To restore bidirectional signaling capabilities between residual nerves and prosthetic devices.
- To re-establish musculotendinous proprioception for enhanced prosthetic functionality and sensation.
Main Methods:
- Established the agonist-antagonist myoneural interface (AMI) using regenerated free muscle grafts and transected nerves.
- Emulated natural limb dynamics by linking muscles in agonist-antagonist pairs.
- Conducted biomechanical, electrophysiological, and histological evaluations to assess the AMI's viability.
Main Results:
- Demonstrated a viable architecture for bidirectional signaling with transected motor nerves.
- Confirmed agonist muscle contraction upon neural activation, generating electromyographic signals.
- Showcased afferent feedback generation via antagonist muscle stretch and confirmed nerve regeneration with spindle fibers.
Conclusions:
- The AMI facilitates robust efferent signals for advanced prosthetic control.
- The interface restores critical musculotendinous proprioception, enhancing sensory feedback for amputees.
- This approach holds significant potential for improving prosthetic controllability and sensation.
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