Computational Modeling of Electromagnetic and Thermal Effects for a Dual-Unit Retinal Prosthesis: Inductive Telemetry, Temperature Increase, and Current Densities in the Retina - Artificial Sight: Basic Research, Biomedical Engineering, and Clinical Advances - page 283

Figure 15.2. Illustration of the human head model and placement of the external
telemetry coil.

over the two-layer coil at the same distance and coaxial alignment 0. The

two-layer coil, however, is less sensitive to misalignment due to eye rotation

=

= 0.

Thermal Modeling

One of the key requirements to prevent potential tissue damage caused by an
electronic implant - such as the retinal prosthesis - is to limit the thermal
elevation induced in the human body due to the operation of the implant itself.
While the extra-ocular components of the retinal prosthesis are not expected
to have any direct thermal effects on the tissues of the eye, the intra-ocular
components will cause temperature increase due to power dissipation. Further,
the wireless telemetry link between the external (primary) coil and the internal
(secondary) coil will cause electromagnetic power deposition in the tissues,
which in turn could lead to temperature increase. While sources of heat cannot