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Magstim 200
SECTION 7: USING THE MAGSTIM 200
7.1 DESCRIPTION OF THE COIL – Standard 90mm Coil – 3193-00
Magnetic nerve stimulation can be achieved by discharging the Magstim
200
Current flows from the instrument through the coil in only one direction.
However, depending upon which side of the coil (labelled A or B) is
facing up, the direction of the current flow relative to the stimulated tissue
will change.
With Side A visible and Side B facing the area to be stimulated, coil
current flows in the anti-clockwise direction and the induced tissue
current flows in the clockwise direction during the stimulating phase.
With Side B visible and Side A facing the area to be stimulated, coil
current will flow in the clockwise direction and induced tissue current
flows in the anti-clockwise direction. The convention used above is that,
in the coil, current flows from positive to negative. In the tissue current
flow refers to ionic (+) movement.
7.2 COIL POSITIONING
Correct coil positioning is essential to allow accurate measurements of the
important parameters such as conduction latency, threshold of
stimulation, response size and waveform morphology.
The MAGSTIM 200
Coil (P/N 3193-00), which is designed for the purposes of deep nerve
stimulation stimulation. Stimulating the motor cortex using the Standard
90mm Coil produces responses which can be recorded from the majority
The Magstim Company Limited 3001-23-04
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with the Stimulating Coil in the vicinity of neuromuscular tissue.
Standard 90mm Stimulating Coil - 3193-00
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is supplied as standard with the Standard 90mm
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LUMENIS EX1091
th
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March 2005
Page 19
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