An in-vitro system for closed loop neuromodulation of peripheral nerves

Area of Science:

• Neuroscience
• Biomedical Engineering

Background:

• Neuromodulation research heavily relies on animal models, presenting ethical and logistical challenges.
• Existing in-vitro systems are often limited to cellular-level studies, lacking scalability for nerve research.

Purpose of the Study:

• To develop and validate an in-vitro system capable of electrical recording and stimulation of large animal peripheral nerves.
• To assess the system's ability to mimic in-vivo physiological conditions, specifically nerve conduction velocity at varying temperatures.

Main Methods:

• Development of a specialized in-vitro setup for explanted large animal nerves.
• Electrical stimulation and recording of evoked compound action potentials (eCAPs) from pig ulnar nerves.
• Analysis of eCAPs in time and velocity domains across a temperature range from 20°C to 37°C.

Main Results:

• The in-vitro system successfully recorded eCAPs from explanted pig ulnar nerves.
• Increasing temperature within the system led to faster nerve conduction velocities (CVs).
• Observed CVs at higher temperatures closely approximated those found in in-vivo conditions.

Conclusions:

• The developed in-vitro system effectively simulates in-vivo peripheral nerve function.
• This validated system provides a promising alternative for neuromodulation research, device optimization, and neural interface development.
• This represents the first in-vitro peripheral nerve system validated against in-vivo data, paving the way for broader adoption.