The Effect of Split Nerve on Electromyography Signal Pattern in a Rat Model

Area of Science:

• Biomedical Engineering
• Neuroscience
• Prosthetics

Background:

• Advancements in prosthetic arms rely on electromyography (EMG) signals.
• Increased EMG signal variability is crucial for intuitive control and coordinated multi-joint movements in prosthetics.
• Current methods aim to increase biosignal sites on amputee stumps for richer data.

Purpose of the Study:

• To investigate the feasibility of using split nerves and muscles to generate distinct EMG signals.
• To determine if this approach can increase the number of usable biosignal patterns for prosthetic control.

Main Methods:

• The study involved surgically splitting the gastrocnemius muscle and peroneal nerve in rats.
• Different nerve-muscle reinnervation strategies were implemented in three groups (SN_50, non-SN_100, non-SN_0).
• Electromyography (EMG) amplitude was measured after 10 weeks to assess signal quality.

Main Results:

• The SN_50 group (split nerve/muscle) showed a mean EMG amplitude of 1.77 mV, not significantly different from the non-SN_100 group (3.45 mV).
• However, the SN_50 group's EMG amplitude was significantly different from the non-SN_0 group (0.76 mV), indicating signal differentiation.
• This suggests that the split nerve/muscle procedure can generate meaningful, distinct EMG signals.

Conclusions:

• A split nerve combined with a split-muscle procedure can produce meaningful EMG signals.
• These signals hold potential for conveying biological intentions to machines, advancing prosthetic control.
• This technique offers a promising avenue for enhancing the functionality of prosthetic devices.