A standardized method to create peripheral nerve injury in dogs using an automatic non-serrated forceps

Area of Science:

• Neuroscience
• Biomedical Engineering
• Surgical Innovation

Background:

• Standardized models are crucial for studying peripheral nerve injuries.
• Existing methods for inducing crush injuries lack precise control over force and duration.
• The oculomotor nerve is vital for eye movement and pupil response.

Purpose of the Study:

• To develop and validate a novel device for creating standardized mechanical crush injuries in peripheral nerves.
• To establish a reliable animal model for studying oculomotor nerve damage.
• To investigate the histological and electrophysiological consequences of controlled nerve crush injury.

Main Methods:

• Design and implementation of an automatic, non-serrated forceps capable of applying adjustable forces (0-100 g) for specific durations (0-60 s).
• Induction of a crush injury to the right oculomotor nerve in dogs using the forceps (10 g for 15 s).
• Histological analysis using Toluidine-blue staining at 2 weeks post-injury and electrophysiological examinations.

Main Results:

• The developed forceps successfully generated a standardized crush injury to the canine oculomotor nerve.
• Histological examination revealed disordered nerve fibers, axonal loss, and thinner myelin sheaths at 2 weeks post-injury.
• Electrophysiological tests showed occasional spontaneous potentials, confirming nerve damage.

Conclusions:

• The novel forceps device provides a reproducible method for creating mechanical peripheral nerve injuries.
• The canine oculomotor nerve crush injury model is validated for studying nerve damage and potential therapeutic interventions.
• This technology facilitates the development of standardized mechanical injury models for peripheral nerves.