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Chronic response of the rat sciatic nerve to the flat interface nerve electrode
Dustin J Tyler1, Dominique M Durand
1Applied Neural Control Laboratory, Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106, USA.
Annals of Biomedical Engineering
|June 12, 2003
Summary
A novel flat interface nerve electrode (FINE) reshapes nerves chronically without causing injury. Small forces applied by the FINE electrode promote nerve reshaping while maintaining nerve physiology and blood-nerve barrier integrity.
Area of Science:
- Biomedical Engineering
- Neuroscience
- Materials Science
Background:
- Peripheral nerve electrodes are crucial for neural interfaces.
- Current designs may cause nerve damage over time.
- Nerve reshaping offers potential for improved electrode contact.
Purpose of the Study:
- To evaluate the chronic effects of a reshaping nerve electrode (FINE) on sciatic nerve physiology, histology, and blood-nerve barrier (BNB).
- To test the hypothesis that controlled force can reshape nerves without adverse effects.
- To determine the force threshold for safe nerve reshaping.
Main Methods:
- Implantation of three FINE electrode designs with varying forces on rat sciatic nerves.
- Assessment of nerve reshaping, physiology, histology, and BNB permeability at 1, 7, and 28 days post-implantation.
- Analysis of animal footprint, nerve histology, and BNB permeability.
Main Results:
- All FINE electrodes significantly reshaped nerves and fascicles.
- High forces induced neurapraxia-like injury, affecting physiology and BNB, with recovery by 14 days.
- Small forces (<30 mm Hg intrafascicular pressure) reshaped nerves without significant changes in physiology, histology, or BNB permeability.
Conclusions:
- A small, non-circumferential force applied by the FINE electrode can chronically reshape the nerve.
- Nerve reshaping is achievable without compromising nerve physiology, histology, or blood-nerve barrier function.
- The FINE electrode with controlled low force is a promising technology for chronic nerve interfacing.