Combinations with pharmaceuticals
by using the extensive knowledge of drugs to augment ESB treatments
a new generation of therapies could be produced. For instance
drugs that improve brain plasticity through neurotrophin up-regulation
could improve integration of complex electrode arrays into the
brain, especially in older patients. The possibilities are only
limited by our understanding of how ESB and drugs can interact.
Nanotechnology
will revolutionise the nature of implants altogether. At first
nanotechnology could provide ways of introducing ultra-fine electrodes
into highly targeted regions in the brain and nervous system.
It is also possible that autonomous stimulators could be introduced,
which use bodily resources to generate electrical pulses in the
target brain region. The implants could also be adaptable, moving
and reshaping to deliver better stimulation and monitoring.
Flexible implants
Devices that have movable electrodes can adapt and refine their
connections with the brain automatically to attain optimal communication.
These would be ideal for paralytic patients who would gradually
gain control of their implant, which would in turn adapt synergistically.
[Andersen,2004]
Fine fibre electrodes
constructed from modern substances like carbon nano-tubes would
open possibilities for integration of neuro-prosthetic devices.
Ultra fine electrode arrays would be smaller and have greater
flexibility for stimulating and monitoring neurons, having many
times more electrodes in a given space. They could be introduced
with less damage to surrounding tissue, by virtue of their nanoscopic
size.
Viral vectors
could be used in a variety of ways, most prominently to highlight
brain areas for targeting. Using a vector that expresses a marker
specific for target tissues to infect the host would allow imagining
methods to pin-point a region beyond what is currently possible.
Improved resolution
in brain imaging would allow finer analysis of target regions,
distinguishing between tissues. The ultimate goal is to have a
resolution of individual neurons. Enhanced imaging resolution
would also lead to more targets for ESB being identified by improving
our knowledge of functional anatomy.
Individual brain function
could be assessed using a variety of functional imaging and genetic
analysis techniques. A patient-specific functional topographic
map would be created, enabling therapies to be tailored perfectly
to each individual.
Smart controllers
Devices that detect internal states of the body can
be used, which react in programmable ways to certain events, and
apply stimulation accordingly. For instance in epilepsy a smart
controller could anticipate an oncoming seizure and offset it
with directed stimulation of the vagus nerve.
Integrating electronics with modified biological molecules could
further extend the possibilities, by allowing the device to detect
chemical signals like neurotransmitters, hormones and cytokines.
Already wireless implants are being used in animals, communicating
between the implant and a handheld controller via radio or infrared
modems. Implants are gradually becoming more and more autonomous.
[Mavoori et al,2005]