Medtronic DBS Mode D'emploi page 25

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cause the neurostimulator to surge or produce a shocking/jolting sensation to the
patient.
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induce/conduct excessive current in the lead or extension system causing tissue
damage, including brain tissue damage.
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temporarily suppress the neurostimulator output.
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cause damage to the implanted system components.
Reducing the possible effects from EMI
Table 2 provides some general information about how to reduce the effects of possible
EMI.
Table 2. Reducing the effects of EMI on implanted brain stimulation
EMI type
Conductive current
Induced/coupled
current
Radiated energy
EMI guidelines for medical procedures
Medtronic neurostimulators are designed to assure immunity from most common sources
of electromagnetic interference (EMI). Because many different types of EMI sources exist,
it is impossible to specify all interference sources here. The following sections describe
the most common sources of EMI along with guidelines on avoiding possible EMI effects.
systems
Suggested guidelines
Conductive current follows the path of least resistance. It will
diverge between body tissue and any implanted lead system in
this path.
Keep the implanted neurostimulator and lead system out of the
conductive path in order to reduce possible disruptive EMI
effects.
For example to minimize EMI effects, keep the electrosurgery
current flow perpendicular to a line drawn between the
neurostimulator case and lead electrodes.
The lead system in any implanted system will act as an
antenna to electric fields. Any loops formed by the lead system
will act as a pickup coil to magnetic fields.
The strength of an electric or magnetic field decreases with
distance. Increase the distance between an EMI source and the
implanted brain stimulation system in order to reduce any
possible disruptive EMI effects.
There is a possibility for high-dose radiation to transiently affect
or permanently damage an implanted neurostimulator and lead
system.
Avoid placing the neurostimulator or lead system directly under
the radiating beam.
Information for prescribers 2017-05-01 English 21