Transcript Transcranial Magnetic Stimulation(TMS)

Transcranial Magnetic
Stimulation(TMS)
By: Brandon Brunelle
What is it
• Trancranial Magnetic Stimulation is a method
used to treat migrains, migrain “aura”, and
even depression
• 10-20% of people suffer from migrains alone
• Relatively new concept
• Not yet widely used or accepted by insurance
Background
• The skull acts as a
shield
• Different parts of
the brain have
different
functionality
• Brain is made up of
neurons and neuron
clusters that are
electrically excitable
The Concept
• Migrains are associated
with high neuron activity
• Depression associated
with low neuron activity.
• Use a magnetic coil to
modulate neuron activity
• Coil is placed on scalp in a
desired location
• Magnetic field penetrates
to a depth of about 3cm
• Approximately three times
the normal neuron
excitation stimulation is
needed to modulate
Components
• 24V voltage
source/high
voltage module
• Bipolar
condensors
• Snubber circuit
• Control circuits
• Copper coil
High voltage module
• Delivers an adjustable positive voltage that is
highly stable
• Custom 10 watt and high voltage module
• Charges condensers in about 23 seconds
• High voltage double pole inverter
Condensors
• Metal impregnated
polypropylene
dielectric with
1500volt
insulation.
• Used to deliver
high current
discharges in about
100uS.
Control Circuit
•Allows for selection of
polarity
•Amplitude adjustment
Snubber Circuit
• Uses two Thyristor to deliver current to coil in
order to provide positive and negative current
• 1800V insulation
• Transfers peak current of 8000A for 10ms
• Time derivatives were 250A/uS, 1000V/uS
• Circuit contains about a 4.3uS lag time causing
polarity to undesirably change in coil
• Snubber circuit contained an R-C setup in paralell
with thrystors to prevent polarity change
Copper Coil
• Coil has a diameter of
11 cm
• Made of flat
enameled copper wire
• Insulated to prevent
coil unwinding
Benefits
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Non invasive
Relatively quick and easy
Does not cause any sort disfunctionality
Would not cost a lot
No chemical imbalances that drugs and
medication can cause
• 74% success rate after two hours in test
Sources
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Design and Construction of a Portable Transcranial Magnetic Stimulation (TMS)
Apparatus for Migraine Treatment: Anne Beuter, Isabelle Lagroye, Bernard Veyret
University of Bordeaux 1,IMS, Site ENSCPB,UMR CNRS 5218,16, Avenue Pey
Berland, 33607, Pessac Cedex, France
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http://intra.ninds.nih.gov/images/Research_Images/[email protected].
jpg
http://www.mclean.harvard.edu/patient/adult/tms.php
http://en.wikipedia.org/wiki/Transcranial_magnetic_stimulation
http://www.nami.org/Content/ContentGroups/Helpline1/Transcranial_Magnetic_
Stimulation_%28rTMS%29.htm
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