Projects:2020s1-2110 Radio-Wave Induced Neural-Plasticity

Abstract here

Project Members

Project students

• Luke Smith
• Jaedon Bem

Supervisors

• Dr. Giuseppe Tettamanzi
• Prof. Christophe Fumeaux
• Prof. Mark Hutchinson

Introduction

Radio-Wave Induced Neural Plasticity is a broad project aiming to investigate the effects of Electromagnetic stimulation of neural tissue. Specifically Transcranial Magnetic Stimulation on neural tissue regrowth in the presence of a graft antenna.

The graft antenna is a suture-less device that can be implanted in nerves using light (e.g. a low power laser) and is able to stimulate remotely action potentials in nerve and muscles, being powered by a Transcranial magnetic stimulation (TMS). The device has a simple design when compared to current stimulators because it does not include circuitry and it functions concurrently as a stimulator and biocompatible conduit for nerve repair (graft). Inside the conduit there is a small metallic loop antenna that stimulates tissue upon TMS irradiation. The graft antenna avoids the usage of separate stimulating electrodes and thus significant shortcomings such as electrode fracture or migration. No clear model explaining the causes of these effects has yet been developed. In this project we are aiming in developing a semi-empirical microscopic modelling that can be used to clarify the causes of the observed microscopic neural effects

Objectives

There are three primary objectives for this project.

1. Calculate the electromagnetic fields inside and around the neuron due to the interactions between the TMS coil and the graft antenna.
2. Determine and quantitatively measure the effect that changing stimulation parameters, such as orientation and type of TMS coil, has on the created electromagnetic fields.
3. Identify the neural response to these fields and identify if the response can be used as a method of determining how effective a given treatment is.

Significance

The ability to improve regeneration of neurons can lead to many medical techniques used to improve the quality of life of patients suffering neuropathologies. These would include treatments to muscular weakness, loss of feeling, and chronic pain. If it could be used as a treatment for pain, it could also help fight the opioid epidemic throughout America.

Background

In 2019, Sliow et al. [3] developed a graft-antenna: a metal ring which could be wrapped around a damaged nerve bundle using a bio-adhesive polymer. In vivo studies using rats showed that when this ring was stimulated by an external Transcranial Magnetic Stimulation device, nerve repair was improved uniformly.

Sliow et al. were unable to identify the mechanisms behind electrical stimulation, necessitating the creation of an electromagnetic model. One unexplained observation of interest was the ‘no-touch-no-response’ effect; if the ring was not in direct contact with the nerve bundle, then no stimulation would occur, regardless of how the stimulation was applied.

Method

The Sim4Life computational environment was used to replicate the physical devices used by Sliow et al., shown to the right. A Quasi Magneto-Static solver was used to calculate the generated fields.

References

[1] a, b, c, "Simple page", In Proceedings of the Conference of Simpleness, 2010.

[2] ...